Engine cooling system, control method, controller, automobile, and storage medium

Abstract

An engine cooling system, comprising a cylinder block, a cylinder cover, a water pump, a warm air branch, and a temperature control branch, wherein the cylinder block cooperates with the cylinder cover to form a cylinder circulation branch; the warm air branch is arranged between the first outlet of the cylinder cover and the inlet of the water pump, and comprises a switch valve and a warm air core body that are arranged in series; the temperature control branch comprises a thermostat; the inlet of the thermostat is connected to the first outlet of the cylinder block, and the outlet of the thermostat is connected to the inlet of the water pump; the outlet of the water pump is connected to the first inlet of the cylinder block. Also disclosed are a cooling system control method, a controller, an automobile, and a storage medium. According to the whole cooling system, the cylinder circulation branch is used to achieve a series cooling effect, a split cooling effect is achieved by means of the temperature control branch and the warm air branch, the compatibility of series cooling and parallel cooling can be achieved, and the cooling effect of the cooling system can be guaranteed.

Description

Engine cooling system, control method, controller, vehicle, and storage medium

[0001] This application claims priority to the Chinese patent application filed with the Patent Office of China on June 9, 2023, with application number 202310689651.5, and with the invention name “Engine cooling system, control method, controller, automobile and storage medium”, as well as the Chinese patent application filed with the Patent Office of China on June 9, 2023, with application number 202321470035.2, and with the invention name “Engine cooling system and automobile”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of engines, and in particular to an engine cooling system, a control method, a controller, a vehicle and a storage medium. Background Art

[0003] The engine cooling systems currently on the market generally include the following two designs: The first is a cylinder block and cylinder head series design, which is mainly used in conventional and traditional models. Its main feature is that the flow pumped out by the water pump flows entirely through the cylinder block and cylinder head, that is, the total flow of the water pump is equal to the flow of the cylinder block and the flow of the cylinder head. The total flow of the water pump is small, and the coolant needs to absorb the heat of the cylinder block and the heat of the cylinder head at the same time, resulting in a large temperature rise and a large system pressure loss. The second is a cylinder block and cylinder head diversion design, which is mainly characterized by the flow pumped out by the water pump partially entering the cylinder block and partially entering the cylinder head. The water pump flow is the sum of the flow of the cylinder block and the flow of the cylinder head. The coolant only absorbs the heat of the cylinder block or the heat of the cylinder head, resulting in a small temperature rise and a small system pressure loss, but the total flow of the water pump is large. The diversion design is mainly to be able to control the cylinder block and the cylinder head at the same time, realize differentiated management, keep the cylinder block warm, increase the oil temperature, and ensure that the cylinder head temperature is low and the combustion chamber does not vibrate.

[0004] Summary of the Invention

[0005] Embodiments of the present invention provide an engine cooling system, a control method, a controller, a vehicle, and a storage medium to solve the problem that existing engine cooling systems are incompatible with cylinder block and cylinder head series designs and split flow designs.

[0006] An engine cooling system includes a cylinder block, a cylinder head, a water pump, a warm air branch and a temperature control branch;

[0007] The cylinder body and the cylinder head cooperate to form a cylinder circulation branch;

[0008] The warm air branch is arranged between the first outlet of the cylinder cover and the inlet of the water pump, and includes a switch valve and a warm air core arranged in series;

[0009] The temperature control branch includes a thermostat, the inlet of the thermostat is connected to the first outlet of the cylinder, and the outlet of the thermostat is connected to the inlet of the water pump;

[0010] The outlet of the water pump is connected to the first inlet of the cylinder body.

[0011] A controller includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the engine cooling system control method is implemented.

[0012] An automobile comprises the above-mentioned engine cooling system, or comprises the above-mentioned controller.

[0013] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the engine cooling system control method is implemented.

[0014] The above-mentioned engine cooling system, control method, controller, automobile and storage medium form a cylinder circulation branch between the cylinder block and the cylinder head, which can absorb the heat of the cylinder block and the cylinder head at the same time, thereby ensuring the series cooling effect of the cylinder block and cylinder head; the warm air branch is arranged between the first outlet of the cylinder head and the inlet of the water pump, and the opening of the switch valve and the speed of the water pump can be adjusted to ensure the shunt cooling effect of the warm air branch on the cylinder head; the temperature control branch is arranged between the first outlet of the cylinder block and the inlet of the water pump, and the thermostat can adaptively adjust the opening of the thermostat according to the temperature sensed by the built-in temperature sensing component to ensure the shunt cooling effect of the temperature control branch on the cylinder block; moreover, the warm air branch and the temperature control branch are connected in parallel to the inlet of the water pump, and then return to the cylinder block through the water pump, so that the coolant in the warm air branch and the temperature control branch do not affect each other, which helps to ensure their cooling effect. The heater core serves as an auxiliary transition cooling element, which can achieve two-speed heat dissipation performance and create a difference in the diversion cooling of the cylinder block and the cylinder head. On the premise of ensuring that the cylinder head does not overheat and the combustion chamber does not detonate, it delays the opening time of the thermostat, further increases the temperature of the engine oil and reduces friction.

[0015] When the measured data collected in the current mode meets the preset switching conditions, the switchable mode corresponding to the preset switching conditions is determined as the target mode, and the target opening and target speed corresponding to the target mode are then determined. The on-off valve in the warm air branch is controlled to operate based on the target opening to meet the need for heat dissipation from the cylinder head through the warm air branch. The thermostat adaptively adjusts its state to switch between different states based on the temperature detected by the built-in temperature sensor to meet the need for heat dissipation from the cylinder block through the temperature control branch. Finally, the water pump is controlled to operate based on the target speed, so that both the warm air branch and the temperature control branch return water to the cylinder block through the water pump to meet the different opening requirements of the water pump in the target mode, thereby ensuring the cooling effect of the engine cooling system in the target mode. The thermostat autonomously adjusts its state based on the temperature detected by the temperature sensor. The controller can independently determine the target mode to switch to based on the measured data. Then, based on the target opening and target speed corresponding to each target mode, the on-off valve and water pump are controlled separately. This prevents interference between different target modes and enables the mutual compatibility of multiple target modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] FIG1 is a schematic diagram of an engine cooling system according to an embodiment of the present invention;

[0018] FIG2 is a flow chart of a method for controlling an engine cooling system according to an embodiment of the present invention;

[0019] 3 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0020] FIG4 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0021] 5 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0022] 6 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0023] 7 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0024] FIG8 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0025] 9 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0026] 10 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0027] 11 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0028] 12 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0029] 13 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0030] 14 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0031] 15 is another flow chart of an engine cooling system control method according to an embodiment of the present invention;

[0032] FIG. 16 is another flow chart of an engine cooling system control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] An embodiment of the present invention provides an engine cooling system, as shown in FIG1 , which includes a cylinder block, a cylinder head, a water pump, a warm air branch, and a temperature control branch; the cylinder block and the cylinder head cooperate to form a cylinder circulation branch; the warm air branch is arranged between the first outlet of the cylinder head and the inlet of the water pump, and includes a switch valve and a warm air core arranged in series; the temperature control branch includes a thermostat, the inlet of the thermostat is connected to the first outlet of the cylinder block, and the outlet of the thermostat is connected to the inlet of the water pump; the outlet of the water pump is connected to the first inlet of the cylinder block.

[0035] The cylinder circulation branch is a branch used to facilitate cooling flow between the cylinder block and cylinder head. This means that coolant in the cylinder block flows to the cylinder head and then flows back from the cylinder head back to the cylinder block, allowing the coolant to flow between the cylinder block and cylinder head, absorbing heat from both the cylinder block and the cylinder head. In this example, when the bypass valve of the warm air branch is closed and the temperature control branch is inoperative (i.e., the thermostat is not activated), the coolant flows only within the cylinder circulation branch formed between the cylinder block and cylinder head, absorbing heat from both the cylinder block and the cylinder head, ensuring effective series cooling of the cylinder block and cylinder head.

[0036] As an example, a warm air branch circuit is located between the first outlet of the cylinder head and the inlet of the water pump. It includes an on-off valve and a heater core arranged in series. A controller is connected to the on-off valve and controls the valve to operate based on a target opening, allowing coolant output from the cylinder head to flow back into the cylinder through the heater core and water pump, allowing the heater core to achieve a warming effect. In this example, the warm air branch circuit is independently controlled by the controller, preventing the heat flow from the warm air branch from affecting the cooling pipes through radiation or convection when high-power air conditioning is required, thereby affecting the maximum cooling effect.

[0037] As an example, a temperature control branch is a branch used to achieve temperature control. This temperature control branch includes a thermostat, the inlet of which is connected to the first outlet of the cylinder block, which is directly connected to the inlet of the water pump. The thermostat's state can be adjusted autonomously according to actual conditions. A thermostat is a valve that controls the flow path of coolant. It is an automatic temperature control device that typically contains a temperature-sensing component and uses thermal expansion or contraction to open and close the flow of air, gas, or liquid. The thermostat automatically adjusts the amount of water entering the radiator based on the cooling water temperature, changing the water circulation range to adjust the cooling system's heat dissipation capacity and ensure that the engine operates within the appropriate temperature range.

[0038] A water pump is a device that transports or pressurizes liquid, providing power for the coolant flow. For example, the water pump's inlet is connected to both the warm air branch, receiving coolant from the cylinder head that flows through the warm air branch, and the temperature control module, receiving coolant from the cylinder block that flows through the temperature control branch. The water pump's outlet is connected to the first inlet of the cylinder block, allowing the water pump to deliver coolant from the warm air branch and / or temperature control branch to the cylinder block. This allows coolant entering the cylinder block to flow within the cylinder circulation branch, ensuring effective cooling.

[0039] In this embodiment, a cylinder circulation branch is formed between the cylinder block and the cylinder head, which can absorb the heat of the cylinder block and the cylinder head at the same time, thereby ensuring the series cooling effect of the cylinder block and the cylinder head; the warm air branch is arranged between the first outlet of the cylinder head and the inlet of the water pump, and the opening of the switch valve and the speed of the water pump can be adjusted to ensure the shunt cooling effect of the warm air branch on the cylinder head; the temperature control branch is arranged between the first outlet of the cylinder block and the inlet of the water pump, and the thermostat can adaptively adjust the opening of the thermostat according to the temperature sensed by the built-in temperature sensing component to ensure the shunt cooling effect of the temperature control branch on the cylinder block; moreover, the warm air branch and the temperature control branch are connected in parallel to the inlet of the water pump, and then flow back to the cylinder block through the water pump, so that the coolant in the warm air branch and the temperature control branch do not affect each other, which helps to ensure their cooling effect. The heater core serves as an auxiliary transition cooling element, which can achieve two-speed heat dissipation performance and create a difference in the diversion cooling of the cylinder block and the cylinder head. On the premise of ensuring that the cylinder head does not overheat and the combustion chamber does not detonate, it delays the opening time of the thermostat, further increases the temperature of the engine oil and reduces friction.

[0040] In one embodiment, the temperature control branch further includes a radiator, one end of the radiator is connected to the outlet of the thermostat, and the other end of the radiator is connected to the inlet of the water pump.

[0041] As an example, the temperature control branch also includes a radiator. One end of the radiator is connected to the thermostat outlet, and the other end is connected to the water pump. This means the thermostat outlet can be connected directly to the water pump inlet or through the radiator. In this example, when the thermostat outlet is directly connected to the water pump inlet, the thermostat enters a small cycle (cylinder block - thermostat - water pump - cylinder block). When the thermostat outlet is connected to the water pump inlet through the radiator, the thermostat enters a large cycle (cylinder block - thermostat - radiator - water pump - cylinder block). In this example, the thermostat is a wax-type thermostat. When the coolant temperature falls below a specified value, the refined paraffin wax inside the thermostat solidifies. A spring in the thermostat closes the passage between the engine and radiator, allowing the coolant to return to the engine via the water pump, entering a small circulation state. When the coolant temperature reaches the specified value, the paraffin wax begins to melt and gradually becomes liquid. Its volume increases, compressing the rubber hose, causing it to contract. This contraction exerts an upward force on the push rod, which in turn exerts a downward counter-thrust on the valve, opening it. The coolant then flows through the radiator and thermostat valve, and then back to the engine via the water pump, entering a large circulation state. In this example, the thermostat is located in the water outlet line of the cylinder block. This approach offers the advantages of a simple structure and eases the removal of air bubbles in the cooling system.

[0042] As an example, the thermostat adaptively adjusts to either a small or large cycle state, and the controller controls the opening or closing of the on-off valve. These switching modes are as follows: The first switching mode is when the thermostat enters the small cycle state and the on-off valve is closed; the second switching mode is when the thermostat enters the small cycle state and the on-off valve is open; the third switching mode is when the thermostat enters the large cycle state and the on-off valve is closed; and the fourth switching mode is when the thermostat enters the large cycle state and the on-off valve is open. Since the thermostat entering the large cycle state indicates a high temperature within the cylinder, requiring rapid heat dissipation from the radiator, the on-off valve is typically not controlled to open, allowing the heater core to divert heat. Therefore, the fourth switching mode is less common. The second switching mode is a transition between the first and third switching modes. The radiator serves as the core cooling element, while the heater core serves as a secondary cooling element. This allows for two-stage cooling performance, creating differential cooling between the cylinder block and cylinder head. While ensuring cylinder head overheating and combustion chamber detonation, the thermostat opening timing is delayed, further increasing the oil temperature and reducing friction. In this example, when the thermostat adaptively switches to the small circulation state or the large circulation state, after the switch valve is opened or closed, the speed of the water pump can be adjusted to make the engine enter different working modes to meet different needs.

[0043] In one embodiment, the engine cooling system further includes a controller connected to the switch valve and the water pump, and configured to control the operation of the switch valve and the water pump.

[0044] As an example, the controller is connected to the switch valve arranged between the first outlet of the cylinder head and the inlet of the water pump. According to actual conditions, the target opening corresponding to the switch valve can be determined to control the switch valve to operate based on the target opening, so as to achieve fine control of the coolant flowing out of the cylinder head to the water pump, which helps to ensure the cooling effect of the engine.

[0045] As an example, the controller is also connected to the water pump, and can determine the target speed of the water pump according to actual conditions to control the water pump to operate based on the target speed, so as to return the coolant output from the warm air branch and / or the temperature control branch to the cylinder body, thereby achieving fine control of the coolant input into the cylinder body by the water pump, which helps to ensure the cooling effect of the engine.

[0046] In this embodiment, a cylinder circulation branch is formed between the cylinder block and the cylinder head, absorbing heat from both the cylinder block and the cylinder head, ensuring a series cooling effect between the cylinder block and the cylinder head. A warm air branch is located between the first outlet of the cylinder head and the inlet of the water pump. Adjusting the opening of the on-off valve and the speed of the water pump ensures that the warm air branch provides a cooling effect on the cylinder head. A temperature control branch is located between the first outlet of the cylinder block and the inlet of the water pump. The thermostat can adaptively switch between a small circulation state and a large circulation state based on a built-in temperature sensing component, and adjust the speed of the water pump to ensure that the temperature control branch provides a cooling effect on the cylinder block. Furthermore, the warm air branch and the temperature control branch are connected in parallel to the inlet of the water pump, and then return the coolant to the cylinder block through the water pump. This ensures that the coolant in the warm air branch and the temperature control branch do not affect each other, thus ensuring effective cooling. The thermostat adaptively adjusts its state based on the sensing results of the built-in temperature sensing component, and the controller controls the operation of the on-off valve and the water pump to achieve precise control of the opening of the on-off valve and the speed of the water pump, thereby ensuring effective cooling of the engine. In this example, the radiator serves as the core cooling element, while the heater core serves as an auxiliary transition cooling element, which can achieve two-speed cooling performance and create a difference in the diversion cooling of the cylinder block and cylinder head. On the premise of ensuring that the cylinder head does not overheat and the combustion chamber does not detonate, the opening time of the thermostat is delayed to further increase the temperature of the engine oil and reduce friction.

[0047] In one embodiment, the engine cooling system further includes a first temperature sensor, which is disposed on a first outlet of the cylinder body and is used to collect the outlet water temperature; the controller is connected to the first temperature sensor and is used to control the operation of the switch valve and the water pump according to the outlet water temperature sent by the first temperature sensor.

[0048] As an example, the first temperature sensor is a temperature sensor provided at the first outlet of the cylinder block. The first temperature sensor is used to collect the outlet water temperature T1 and transmit the outlet water temperature T1 to the controller. The controller then determines the target mode to be controlled for the engine based on the collected outlet water temperature T1, thereby controlling the on-off valve to operate at a target opening according to the target mode, and controlling the water pump to operate at a target speed according to the target mode.

[0049] In one embodiment, the engine cooling system further comprises a supercharger, wherein the inlet of the supercharger is connected to the second outlet of the cylinder block, and the outlet of the supercharger is connected to the inlet of the cylinder head.

[0050] As an example, the supercharger is arranged between the second outlet of the cylinder block and the inlet of the cylinder head. The coolant can be drawn from the second outlet of the cylinder block and then returned to the cylinder head without the need for an additional overflow pipe, which helps save costs and simplify the structure.

[0051] In one embodiment, an overflow port is provided on the cylinder head; the engine cooling system further comprises an expansion water tank, the inlet of the expansion water tank is connected to the overflow port, and the outlet of the expansion water tank is connected to the inlet of the water pump.

[0052] As an example, an overflow port is designed on the cylinder head, and an expansion water tank is set between the overflow port of the cylinder head and the inlet of the water pump. The coolant overflowing from the cylinder head is returned to the cylinder body through the water pump to achieve the purpose of water replenishment.

[0053] In one embodiment, the engine cooling system further includes an oil cooler, one end of the oil cooler is connected to the third outlet of the cylinder block, and the other end of the oil cooler is connected to the second inlet of the cylinder block.

[0054] In one embodiment, the water pump is an electronic water pump. An electronic water pump utilizes piezoelectric materials as its power source, achieving complete electronicization from control to drive. Liquid delivery is fully controlled by an integrated electronic system, thereby achieving adjustable and precise liquid delivery. In this example, the electronic water pump can be connected to a controller, enabling precise control based on control signals from the controller to ensure control accuracy.

[0055] As an example, the engine cooling system also includes an oil cooler, one end of which is connected to the third outlet of the cylinder body, and the other end of the oil cooler is connected to the second inlet of the cylinder body, for cooling the engine oil in the cylinder body to ensure the cooling effect of the engine oil.

[0056] In one embodiment, the cylinder circulation branch includes a first pipe and a second pipe connected between the cylinder block and the cylinder head.

[0057] As an example, an outlet of the cylinder block is connected to an inlet of the cylinder head through a first pipe, and an outlet of the cylinder head is connected to an inlet of the cylinder block through a second pipe, so that a cylinder circulation branch is formed between the cylinder block and the cylinder head. The coolant flowing into the cylinder block from the water pump first flows into the cylinder block, flows from the cylinder block into the cylinder head through the first pipe, and flows back to the cylinder block from the cylinder head through the second pipe, so that the coolant flows between the cylinder block and the cylinder head, so that the coolant can absorb the heat of the cylinder block and the cylinder head.

[0058] Existing engine cooling systems suffer from incompatibility issues when controlling different modes. For example, after the engine is shut down, if the cooling system stops flowing, the high temperatures of 800-900°C inside the supercharger will quickly boil the coolant nearby. Therefore, post-operation is generally required. However, this process of drawing coolant out of the radiator for cooling also draws coolant from other parts of the engine to the radiator for heat exchange, resulting in significant overall heat dissipation. Hybrid vehicles, on the other hand, experience frequent start-stop cycles. If the temperature drops too quickly after each shutdown, a re-warm-up cycle is required at the next start, hindering the maintenance of low friction. This also significantly hinders oil dilution in cold climates, placing a high demand on thermal insulation. Consequently, the requirements for post-operation of the supercharger and oil insulation conflict, making them unsuitable for simultaneous consideration. Furthermore, during engine shutdown, heat remains within the engine. If heating is required, flow can be maintained to some extent to utilize the residual heat. However, this utilization of residual heat from heating generally conflicts with the need for oil insulation, making it unfeasible.

[0059] In one embodiment, as shown in FIG2 , a method for controlling an engine cooling system is provided. The method is applicable to the engine cooling system in the above embodiment and can be applied in a controller. The method includes:

[0060] S201: When the engine is in the current mode, obtaining measured data;

[0061] S202: If the measured data meets the preset switching conditions, the switchable mode corresponding to the preset switching conditions is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, the water pump is controlled to operate based on the target speed corresponding to the target mode, and the thermostat is adaptively adjusted.

[0062] The current mode refers to the current operating mode of the engine. The target mode refers to the operating mode the engine needs to switch to, that is, the operating mode the engine needs to enter at the next moment. The target mode is one of the multiple switchable modes corresponding to the current mode. A switchable mode here refers to an operating mode that can be switched from the current mode. The preset switching condition is the pre-set condition for switching from the current mode to a switchable mode.

[0063] The measured data refers to data collected in real time. As an example, the measured data includes but is not limited to engine speed, flameout interval, and engine outlet water temperature T1.

[0064] As an example, in step S201, when the engine is in the current mode, the EMS may determine, based on the current mode, at least one switchable mode corresponding to the current mode and the preset switching conditions corresponding to each switchable mode. Based on the preset switching conditions corresponding to all switchable modes, the EMS may collect measured data corresponding to the preset switching conditions. For example, if the preset switching condition between the current mode and a switchable mode is to determine whether the outlet water temperature T1 reaches a certain threshold, then the measured data of the engine outlet water temperature T1 may need to be collected.

[0065] As an example, in step S202, when the engine is in the current mode, the EMS compares the measured data it obtains with the preset switching conditions corresponding to at least one switchable mode. If the measured data meets a preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, that is, the working mode that the engine needs to be controlled to enter at the next moment is determined.

[0066] In this example, after determining the target mode, the EMS must first determine the target opening corresponding to the switch valve based on the target mode. The target opening here can be a pre-set opening value, or an opening value determined in real time based on the engine outlet water temperature T1, ambient temperature, engine operating conditions or other measured data; then, the switch valve is controlled to operate based on the target opening to make the warm air branch between the cylinder head and the water pump work or not, to meet the opening requirement of the switch valve under the target mode, specifically to meet the heat dissipation requirement of the cylinder head under the target mode.

[0067] In this example, after determining the target mode, the EMS must first determine the target speed corresponding to the water pump based on the target mode. The target speed here can be a preset speed value, or a speed value determined in real time based on the outlet water temperature T1, ambient temperature, engine operating conditions, or other measured data; then, the water pump is controlled based on the target speed to control the flow rate of the coolant injected into the cylinder by the water pump to meet the water pump opening requirement under the target mode.

[0068] In this example, when the engine switches from the current mode to the target mode, the EMS thermostat adaptively adjusts its state, that is, it adaptively switches to a small cycle state (cylinder block-thermostat-water pump-cylinder block cycle state) or a large cycle state (cylinder block-thermostat-radiator-water pump-cylinder block cycle state) according to the temperature detected by its built-in temperature sensing component to meet the cooling requirements of the cylinder block in the target mode.

[0069] In this embodiment, when measured data collected in the current mode meets a preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, and the target opening and target speed corresponding to the target mode are then determined. The on / off valve in the warm air branch is controlled to operate based on the target opening to meet the need for heat dissipation from the cylinder head via the warm air branch. The thermostat adaptively adjusts its state to switch between different states based on the temperature detected by the built-in temperature sensing component to meet the need for heat dissipation from the cylinder block via the temperature control branch. Finally, the water pump is controlled to operate based on the target speed, ensuring that both the warm air branch and the temperature control branch return water to the cylinder block through the water pump to meet the different water pump opening requirements under the target mode, thereby ensuring the cooling effect of the engine cooling system under the target mode. The thermostat autonomously adjusts its state based on the temperature detected by the temperature sensing component, and the controller independently determines the target mode to switch to based on measured data. The on / off valve and water pump are then controlled based on the target opening and target speed corresponding to each target mode. This prevents interference between different target modes and enables the interoperability of multiple target modes.

[0070] In one embodiment, as shown in FIG3 , a method for controlling an engine cooling system is provided, which may be applied in a controller (hereinafter referred to as an EMS). The method includes:

[0071] S301: When the engine is in a starting mode, obtain the engine speed;

[0072] S302: If the engine speed is not zero, the pre-processing mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to operate based on the first calibrated speed, and the thermostat enters a small circulation state.

[0073] Wherein, step S301 is a specific implementation of step S201, and step S302 is a specific implementation of step S202.

[0074] The startup mode refers to the engine mode after the vehicle is started. The first calibrated speed refers to the pre-calibrated target speed corresponding to the pre-conditioning mode. The target speed here is the speed required to control the rotation of the water pump. As an example, when the engine enters the pre-conditioning mode, the pre-calibrated first calibrated speed can be set to 70% of the maximum speed. The pre-conditioning mode is the first mode in which the engine cooling system begins to operate.

[0075] As an example, in step S301, after the vehicle is started and enters the start mode (i.e., the start status bit B_stend is 1), the EMS begins to detect the engine speed EngSpd. It is necessary to determine whether the engine speed EngSpd is zero to determine whether the preset switching conditions of the pre-processing mode are met.

[0076] As an example, in step S302, when the engine speed EngSpd is not zero, the EMS can be deemed to be activated, and the activation status bit B_start = 1. At this time, it is determined that the preset switching conditions of the preprocessing mode are met, and the engine needs to be controlled to enter the preprocessing mode. The mode status bit corresponding to the preprocessing mode is set to 0, that is, Set_model = 0.

[0077] As an example, when the engine is in starting mode and the engine speed EngSpd is not zero, the EMS can determine that the coolant temperature inside the engine is low. At this time, the thermostat adaptively enters the small circulation state according to the detected temperature, that is, the coolant output from the cylinder can directly enter the water pump through the thermostat without passing through the radiator to enter the water pump; when the engine is in starting mode and the engine speed EngSpd is not zero, the EMS determines that the preset switching conditions of the pre-processing mode are met. At this time, the EMS needs to control the switch valve to close. Specifically, in the pre-processing mode, the target opening of the switch valve is set to zero, that is, p_target_bpv=inicheck_bpv (typical value is 0%), closing the warm air branch so that the warm air branch does not participate in the coolant circulation. In addition, the EMS needs to obtain the first calibrated speed corresponding to the pre-processing mode as the target speed, that is, the target speed n_target_ewp=inicheck_ewp (this value is preset through calibration, the typical value is 70%); then, the water pump is controlled to work based on the target speed. When the engine enters the pre-treatment mode from the start-up mode, the coolant output by the water pump enters the cylinder block; the coolant in the cylinder block is directly transmitted to the cylinder head and then to the cylinder head through the supercharger; the coolant in the cylinder head flows back to the cylinder block and flows into the water pump through the thermostat connected to the cylinder block. The water pump operates based on the first calibrated speed, causing the engine to enter the pre-treatment mode Set_model=0. At this time, the engine cooling system is cooled through the small circulation state of the cylinder circulation branch and the temperature control branch. There is no need to cool the cylinder head through the warm air branch, nor is there any need to dissipate heat to the cylinder block through the large circulation branch where the radiator is located, which can meet the cooling requirements under the pre-treatment module.

[0078] In one embodiment, as shown in FIG4 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0079] S401: When the engine is in a pre-processing mode, obtaining a flameout interval time;

[0080] S402: If the flameout interval is less than the first time threshold, the normal mode is determined as the target mode, the on-off valve is controlled to close, and the water pump is controlled to enter the third operating mode according to the engine operating condition and the outlet water temperature, and the thermostat enters the small circulation state or the large circulation state.

[0081] S403: If the flameout interval is not less than the first time threshold, the first heat engine mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to enter the intermittent working mode, and the thermostat enters the small circulation state.

[0082] Among them, step S401 is a specific implementation of step S201, and step S402 and step S403 are specific implementations of step S202.

[0083] The "interval between shutdowns" refers to the time between the current moment and the most recent shutdown. The first time threshold is a pre-set threshold used to assess whether the interval meets a shorter threshold. The first warm-up mode rapidly heats the engine coolant. The normal mode is the mode after the engine is fully warmed up.

[0084] As an example, in step S401, when the engine is in pre-processing mode Set_model = 0, the EMS needs to determine the flameout interval corresponding to pre-processing mode Set_model = 0 based on the current time and the most recent flameout time. Then, the flameout interval can be compared with a pre-set first time threshold to determine the engine state based on the comparison result. The engine state refers to the state of the engine at the current moment, which can be either hot or cold. The hot and cold states here are determined by the temperature of the coolant inside the engine. For example, when the coolant inside the engine is water, the hot state here refers to the state of hot water inside the engine, and conversely, the cold state refers to the state of cold water inside the engine.

[0085] As an example, in step S402, when the engine shutoff interval is less than a first time threshold, the EMS determines that the interval between the current moment and the last shutdown at the end of the previous drive cycle is short. At this point, the engine coolant temperature is high, indicating that the engine is in a hot state and no warm-up operation is required. This determines that the engine meets the preset transition conditions for normal mode, and sets normal mode as the target mode. At this point, the thermostat adaptively adjusts its state, allowing it to adjust based on its physical characteristics as the water temperature changes, adjusting the opening ratio of the large and small loops. This allows the coolant output from the cylinder to flow directly back to the water pump through the small loop, entering the small loop state, or to flow back to the water pump through the radiator, entering the large loop state. In this example, when the EMS determines the normal mode as the target mode, it needs to control the on-off valve to close so that the warm air branch does not participate in the coolant circulation, ensuring that the warm air core does not divert, so as to ensure that the radiator has sufficient coolant under high temperature conditions; the EMS also controls the water pump to enter the third operating mode according to the engine operating conditions and the outlet water temperature, so as to adjust its target speed according to the outlet water temperature T1 and the engine operating conditions, so as to achieve adaptive adjustment. Among them, the third operating mode refers to the mode of adaptive adjustment of the water pump according to the engine operating conditions (including but not limited to engine speed and engine load conditions) and the outlet water temperature T1. In this example, the normal mode of the engine refers to the mode in which the thermostat adaptively adjusts the opening ratio, the on-off valve is closed, and the water pump enters the mode corresponding to the third operating mode.

[0086] As an example, in step S403, if the engine shutoff interval is not less than a first time threshold, the EMS determines that the interval between the current moment and the last shutdown moment at the end of the previous drive cycle is long. At this point, the engine coolant temperature is low, indicating that the engine is cold and requires rapid warm-up. The EMS determines that the preset switching conditions for the first warm-up mode are met, and thus determines the first warm-up mode as the target mode. Due to the low engine coolant temperature, the thermostat must be switched to a short-circuit state, meaning that coolant output from the cylinder can flow directly through the thermostat to the water pump without passing through the radiator. Accordingly, upon determining the first warm-up mode as the target mode, the EMS controls the on-off valve to close. Specifically, the on-off valve's target opening can be set to zero, closing the warm air branch so that it does not participate in the coolant circulation, preventing diversion and ensuring rapid warm-up. Furthermore, the EMS controls the water pump to enter intermittent operation to enable the engine to enter the first warm-up mode. Intermittent operation here refers to a cycle in which the water pump operates at the target speed for a period of time, then stops and resumes operation. Each time the water pump stops, coolant in the engine cooling system stops flowing, rapidly focusing heat within the cylinder block and cylinder head, causing the oil temperature to rise rapidly, achieving rapid warm-up. In this example, the first warm-up mode is when the thermostat enters a short-circuit state, the on / off valve closes, and the water pump enters intermittent operation.

[0087] In this example, when the engine enters the first warm-up mode from the preconditioning mode, coolant output by the water pump enters the cylinder block. The coolant in the cylinder block can be directly transferred to the cylinder head and then to the cylinder head via the supercharger. The coolant in the cylinder head then flows back to the cylinder block and flows into the water pump through a thermostat connected to the cylinder block, controlling the water pump to enter intermittent operation mode, causing the engine to enter the first warm-up mode (Set_model = 1). When the water pump is controlled to enter intermittent operation mode, each time the water pump stops operating, the coolant in the engine cooling system stops flowing. This heat is quickly concentrated inside the cylinder block and cylinder head, simultaneously causing the engine oil temperature to rise rapidly, achieving the purpose of rapid warm-up. Each time the water pump operates based on the target speed, the coolant in the engine cooling system flows and can flow out of the cylinder block, allowing the temperature sensor located at the engine outlet to make further judgments based on the real-time detected engine outlet water temperature T1.

[0088] In one embodiment, as shown in FIG5 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0089] S501: When the engine is in a pre-processing mode, obtaining the outlet water temperature of the engine;

[0090] S502: If at least one outlet water temperature obtained within the preset time is greater than the first temperature threshold, the normal mode is determined as the target mode, the on-off valve is controlled to close, and the water pump is controlled to enter the third operating mode according to the engine operating condition and the outlet water temperature, and the thermostat enters the small circulation state or the large circulation state.

[0091] S503: If all outlet water temperatures obtained within the preset time are not greater than the first temperature threshold, the first heat engine mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to enter the intermittent working mode, and the thermostat enters the small circulation state.

[0092] Among them, step S501 is a specific implementation of step S201, and step S502 and step S503 are specific implementations of step S202.

[0093] The engine outlet water temperature refers to the water temperature at the engine outlet, specifically the temperature recorded in real time by the temperature sensor located at the engine outlet, and can be represented by T1. The first temperature threshold refers to a pre-set temperature threshold used to assess and determine engine status, and can be represented by Tth1. The first warm-up mode rapidly heats the engine coolant. The normal mode refers to the mode after the engine is fully warmed up.

[0094] As an example, in step S501, when the engine is in the pre-processing mode Set_model=0, the EMS can obtain the engine outlet water temperature T1 collected in real time by the temperature sensor set at the engine outlet, and compare the engine outlet water temperature T1 with the first temperature threshold to determine the engine status based on the comparison result.

[0095] As an example, in step S502, if the outlet water temperature T1 of at least one engine, as measured by the EMS within a preset time period, is greater than a first temperature threshold, the EMS determines that the coolant temperature at the engine outlet is high. This indicates that the engine is in a hot state, eliminating the need for rapid warm-up. This indicates that the engine meets the preset switching conditions for normal mode, and normal mode is determined as the target mode. At this point, the thermostat adaptively adjusts its state, switching to either the small or large circulation state. The on / off valve is closed, and based on the engine operating conditions and outlet water temperature, the water pump is controlled to enter the third operating mode, thereby returning the engine to normal mode. This process is similar to that of step S402 and is not detailed here to avoid repetition.

[0096] As an example, in step S503, when the outlet water temperature T1 of all engines obtained by the EMS within a preset time period is not greater than the first temperature threshold Tth1, it is determined that the coolant temperature at the engine outlet is low, and the engine state can be determined to be cold, requiring rapid warm-up operation. It can be determined that the preset switching conditions corresponding to the first warm-up mode are met, and the first warm-up mode is determined as the target mode. The switch valve can be controlled to close, causing the thermostat to enter a small circulation state, and the water pump to enter an intermittent working mode to cause the engine to enter the first warm-up mode. The processing process is similar to step S403 and is not described here one by one to avoid repetition. In this example, since the coolant in the engine cooling system does not flow in the first warm-up mode, it is impossible to grasp the timing of exiting the first warm-up mode. Therefore, it is necessary to control the water pump to enter an intermittent working mode to intermittently judge and subsequently control the engine state.

[0097] In this example, when the engine enters the first warm-up mode from the preconditioning mode, coolant output by the water pump enters the cylinder block. The coolant in the cylinder block can be directly transferred to the cylinder head and then to the cylinder head via the supercharger. The coolant in the cylinder head then flows back to the cylinder block and flows into the water pump through a thermostat connected to the cylinder block, controlling the water pump to enter intermittent operation mode, causing the engine to enter the first warm-up mode (Set_model = 1). When the water pump is controlled to enter intermittent operation mode, each time the water pump stops operating, the coolant in the engine cooling system stops flowing. This heat is quickly concentrated inside the cylinder block and cylinder head, simultaneously causing the engine oil temperature to rise rapidly, achieving the purpose of rapid warm-up. Each time the water pump operates based on the target speed, the coolant in the engine cooling system flows and can flow out of the cylinder block, allowing the temperature sensor located at the engine outlet to make further judgments based on the real-time detected engine outlet water temperature T1.

[0098] In one embodiment, in step S403 or step S503, controlling the water pump to enter the intermittent working mode includes:

[0099] (1) querying a first temperature speed table, a first temperature operation time table, and a first temperature stop time table based on the outlet water temperature of the engine to obtain a target speed, a target operation time, and a target stop time, respectively;

[0100] (2) Control the water pump to operate based on the target speed and monitor the running time of the water pump;

[0101] (3) When the water pump operating time reaches the target operating time, the water pump is controlled to stop working and the current stop time is monitored;

[0102] (4) When the current stop time reaches the target stop time, the water pump is repeatedly controlled to operate based on the target speed and the running time of the water pump is monitored.

[0103] As an example, the EMS can query a pre-configured first temperature-speed table based on the engine's outlet water temperature T1 to obtain the target speed corresponding to outlet water temperature T1. This first temperature-speed table is a pre-configured two-dimensional mapping table that reflects the correspondence between outlet water temperature T1 and water pump speed. Specifically, it is a two-dimensional mapping table corresponding to the first thermal engine mode and can be represented by Map_int_n_rapid_M1. Accordingly, the target speed obtained from the table query can be represented by int_n_rapid_M1.

[0104] As an example, the EMS can query a pre-set first temperature operation table based on the engine's outlet water temperature T1 and obtain the target operating time corresponding to outlet water temperature T1 from the first temperature operation table. This first temperature operation table is a pre-set two-dimensional mapping table that reflects the correspondence between outlet water temperature T1 and target operating time. Specifically, it is a two-dimensional mapping table corresponding to the first thermal engine mode and can be represented by Map_int_onti_rapid_M1_ewp. Accordingly, the target operating time obtained from the table query can be represented by int_ti_rapid_M1_ewp.

[0105] As an example, the EMS can query a pre-set first temperature-offset schedule based on the engine's outlet water temperature T1 and obtain the target offset duration corresponding to outlet water temperature T1 from the first temperature-offset schedule. This first temperature-offset schedule is a pre-set two-dimensional mapping table that reflects the correspondence between outlet water temperature T1 and target offset duration. Specifically, it is a two-dimensional mapping table corresponding to the first thermal engine mode and can be represented by Map_int_offti_rapid_M1_ewp. Accordingly, the target offset duration obtained from the table lookup can be represented by Map_int_offti_rapid_M1_ewp.

[0106] The pump operating time refers to the time difference between the current time and the time when the pump starts operating at the target speed. The current off time refers to the time difference between the current time and the time when the pump stops operating.

[0107] As an example, after obtaining the target speed, target operating time and target stop time corresponding to the engine's outlet water temperature T1, the EMS first controls the water pump to operate based on the target speed, and controls the water pump to stop working when the real-time monitored water pump operating time reaches the target operating time; after the water pump stops working, after the real-time monitored current stop time reaches the target stop time, the EMS repeats the control of the water pump to operate based on the target speed, and controls the water pump to stop working when the real-time monitored water pump operating time reaches the target operating time, and repeats the cycle until the first heat engine mode is exited.

[0108] In this example, when the water pump is controlled to enter the intermittent working mode, each time the water pump stops working, the coolant in the engine cooling system stops flowing, and its heat will quickly focus inside the cylinder block and cylinder head, while causing the oil temperature to rise rapidly, so as to achieve the purpose of rapid engine warm-up; each time the water pump works based on the target speed, the coolant in the engine cooling system flows and can flow out of the cylinder body, so that the temperature sensor set at the engine outlet can make further judgments based on the real-time detected engine outlet water temperature T1.

[0109] In one embodiment, as shown in FIG6 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0110] S601: When the engine is in a first warm-up mode, obtaining an outlet water temperature of the engine;

[0111] S602: If the outlet water temperature is greater than the second temperature threshold, the second heat engine mode is determined as the target mode, the switch valve is controlled to close, and based on the outlet water temperature of the engine, the water pump is controlled to enter the low flow working mode and the thermostat enters the small circulation state.

[0112] Wherein, step S601 is a specific implementation of step S201, and step S602 is a specific implementation of step S202.

[0113] The second temperature threshold is a preset temperature threshold used to evaluate whether a preset switching condition of the second thermal engine mode is met, and can be represented by Tth2. Generally speaking, the second temperature threshold Tth2 is greater than the first temperature threshold Tth1.

[0114] As an example, in step S601, when the engine enters the first heat engine mode, that is, after controlling the switch valve to close, the thermostat to enter the small circulation state, and controlling the water pump to enter the intermittent working mode, the EMS needs to obtain the engine outlet water temperature T1 collected in real time by the temperature sensor set at the engine outlet, and then compare the outlet water temperature T1 with the second temperature threshold Tth2 to evaluate whether it is necessary to switch from the first heat engine mode to the second heat engine mode.

[0115] As an example, in step S602, when the outlet water temperature corresponding to the first heat engine mode is greater than the second temperature threshold, that is, T1>Tth2, the EMS can determine that the engine outlet water temperature T1 is relatively high at this time, and the cylinder block and cylinder head wall temperatures have reached a certain level. During the water pump stop period, there are significant temperature differences between different areas of the engine. At this time, continuous coolant flow through each area of ​​the engine is required to make the temperature field more uniform, but not too much, that is, the radiator is not required to remove additional heat from the engine cooling system. Therefore, it is determined that the preset switching conditions corresponding to the second heat engine mode are met, and the second heat engine mode is determined as the target mode. At this time, the thermostat adaptively enters the small circulation state and can control the on-off valve to close. Based on the engine outlet water temperature, the water pump is controlled to enter the low-flow operating mode to make the engine enter the second heat engine mode. The low-flow operating mode here refers to the operating mode in which the water pump is controlled to operate at a lower speed, resulting in a smaller coolant flow rate. In this example, the second heat engine mode refers to the mode in which the thermostat enters the small circulation state, the on-off valve is closed, and the water pump enters the low-flow operating mode.

[0116] As an example, when the EMS needs to control the engine from the first warm-up mode to the second warm-up mode, due to the low temperature of the engine's internal coolant, the thermostat must enter a low-circulation state. That is, the coolant output from the cylinder can directly enter the water pump through the thermostat, without passing through the radiator. At this time, the EMS needs to control the on-off valve to close. Specifically, the on-off valve's target opening can be set to zero, closing the warm air branch so that the warm air branch does not participate in the coolant circulation. In addition, the EMS needs to use a preset strategy to determine the target speed corresponding to the outlet water temperature of the engine, and control the water pump to enter a low-flow operating mode to achieve the purpose of achieving a uniform temperature field between the engine's cylinder block and cylinder head.

[0117] In this example, when the engine enters the second warm-up mode from the first warm-up mode, coolant output by the water pump enters the cylinder block; the coolant in the cylinder block is directly transferred to the cylinder head and then to the cylinder head through the supercharger; the coolant in the cylinder head flows back to the cylinder block and flows into the water pump through a thermostat connected to the cylinder block. Based on the engine's outlet water temperature, the water pump is controlled to enter a low-flow operating mode, causing the engine to enter the second warm-up mode (Set_model = 2). When the water pump is controlled to enter the low-flow operating mode based on the engine's outlet water temperature, it is controlled to operate at a lower speed to ensure that the low flow rate of coolant continues to flow through the cylinder block and cylinder head, making the temperature field between the cylinder block and cylinder head more uniform.

[0118] In one embodiment, in step S602, controlling the water pump to enter a low flow mode based on the outlet water temperature of the engine includes:

[0119] The second temperature-speed table is queried based on the outlet water temperature of the engine to obtain the target speed, and the water pump is controlled to operate based on the target speed.

[0120] Among them, the second temperature and speed table is a pre-set two-dimensional mapping table for reflecting the corresponding relationship between the outlet water temperature T1 and the water pump speed, specifically a two-dimensional mapping table corresponding to the second thermal engine mode, which can be represented by Map_int_n_rapid_M2. Accordingly, the target speed obtained by looking up the table can be represented by int_n_rapid_M2.

[0121] As an example, the EMS can query a pre-set second temperature-speed table, Map_int_n_rapid_M2, based on the engine's outlet water temperature T1. From this table, it retrieves the target speed corresponding to outlet water temperature T1 and then controls the water pump to operate based on the target speed. Generally speaking, the target speed corresponding to outlet water temperature T1, as determined from the second temperature-speed table, is lower than the target speed corresponding to outlet water temperature T1, as determined from the first temperature-speed table. This results in a lower coolant flow rate entering the engine when the engine enters the second warm-up mode, ensuring a uniform temperature increase.

[0122] In one embodiment, as shown in FIG7 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0123] S701: When the engine is in the second heating mode, obtaining the engine outlet water temperature and air conditioning demand;

[0124] S702: If the outlet water temperature is greater than the third temperature threshold and the air conditioning demand is for heating, the first heating mode is determined as the target mode, the switch valve is controlled to open, the water pump is controlled to operate based on the second calibrated speed, and the thermostat enters the small circulation state.

[0125] Wherein, step S701 is a specific implementation of step S201, and step S702 is a specific implementation of step S202.

[0126] The air conditioning demand refers to the demand sent by the air conditioning system (Heating Ventilation Air Conditioning, hereinafter referred to as HVAC). The air conditioning demand may include heating demand and no heating demand. For example, Bit_heater=1 can be used to indicate heating demand, and Bit_heater=0 can be used to indicate no heating demand.

[0127] The third temperature threshold is a preset temperature threshold for evaluating whether it is necessary to switch to the first heating mode, which can be represented by Tth3. Generally speaking, the third temperature threshold Tth3 is greater than the second temperature threshold Tth2.

[0128] The second calibrated speed is the pre-calibrated target speed for controlling the water pump. This second calibrated speed can be set to 50% of the maximum speed, providing a flow rate sufficient to support heating needs. The first heating mode controls the operation of the heater core to meet heating needs. This mode is between the second heat engine mode and the split flow mode and can be represented by Set_model = 2.5.

[0129] As an example, in step S701, when the engine is in the second heating mode Set_model=2, the EMS can obtain the engine outlet water temperature T1 collected in the second heating mode and the air-conditioning demand sent by the air-conditioning system HVAC, so as to evaluate whether it is necessary to enter the first heating mode based on the outlet water temperature T1 and the air-conditioning demand.

[0130] As an example, in step S702, when the outlet water temperature is greater than the third temperature threshold (i.e., T1 > Tth3) and the air conditioning demand indicates a heating demand (Bit_heater = 1), the EMS determines that the engine outlet water temperature is high, the engine is essentially fully heated, and can provide sufficient warm air. Furthermore, the EMS analyzes and determines the air conditioning demand during the HVAC transmission process of the air conditioning system. Upon determining that the air conditioning demand indicates a heating demand, the EMS determines that the preset switching conditions corresponding to the first heating mode are met, and determines the first heating mode as the target mode, i.e., controlling the engine to enter the first heating mode and setting its mode status bit to Set_model = 2.5. Accordingly, if the outlet water temperature is not greater than the third temperature threshold, the EMS determines that the engine is not fully heated and cannot provide sufficient warm air, and will not switch to the first heating mode. Alternatively, if the EMS analyzes the air conditioning demand as no heating demand (Bit_heater = 0), the EMS does not consider the heating demand and will not enter the first heating mode.

[0131] As an example, when the EMS needs to control the engine from the second thermal engine mode Set_model=2 to the first heating mode Set_model=2.5, the thermostat automatically enters the small circulation state, that is, the coolant output by the cylinder can directly enter the water pump through the thermostat without passing through the radiator to enter the water pump. At this time, the coolant in the warm air branch and the coolant output by the thermostat through the small circulation are both input into the water pump; at this time, the EMS needs to control the switch valve to open (that is, p_target_bpv=on), open the warm air branch, and allow the warm air branch to participate in the coolant circulation; and, the EMS needs to obtain the second calibrated speed corresponding to the warm air demand as the target speed, and control the water pump to work based on the target speed.

[0132] In this example, when the engine enters the first heating mode from the second warming mode, coolant output by the water pump enters the cylinder block. The coolant in the cylinder block is directly transferred to the cylinder head and then to the cylinder head via the supercharger. The coolant in the cylinder head then flows back to the water pump through the cylinder block and thermostat, and then back to the water pump through the warm air branch formed by the on-off valve and the heater core. The water pump operates at a second calibrated speed, causing the engine to enter the first heating mode (Set_model=2.5). Because the coolant temperature in the engine is relatively high when the engine enters the first heating mode, it passes through the heater core and meets the heating requirement. Furthermore, the EMS can send a blower enable signal to the HVAC system, enabling the system to control the blower. Specifically, the status bit Bit_HtqForb is set to 0 and sent to the HVAC system, causing the HVAC system to activate the blower and ensure a warm air effect.

[0133] In one embodiment, as shown in FIG8 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0134] S801: When the engine is in the second heating mode or the first heating mode, obtaining the engine outlet water temperature;

[0135] S802: If the outlet water temperature is greater than the fourth temperature threshold, the diversion mode is determined as the target mode, the switch valve is controlled to open, and the water pump is controlled to enter the first operating mode according to the engine operating condition and the outlet water temperature, and the thermostat enters the small circulation state.

[0136] Wherein, step S801 is a specific implementation of step S201, and step S802 is a specific implementation of step S202.

[0137] The fourth temperature threshold is a preset temperature threshold used to assess whether to switch to the split mode, and can be represented by Tth4. Generally, the fourth temperature threshold Tth4 is greater than the third temperature threshold Tth3. The split mode is a mode in which the cylinder block and cylinder head split, and can be represented by Set_model=3.

[0138] As an example, in step S801, when the engine is in the second heating mode Set_model=2 or the first heating mode Set_model=2.5, the EMS can obtain the outlet water temperature T1 of the engine, and compare the outlet water temperature T1 with the preset fourth temperature threshold Tth4, so as to determine whether the preset switching conditions corresponding to the diversion mode are met based on the comparison result.

[0139] As an example, in step S802, when the outlet water temperature is greater than the fourth temperature threshold, that is, T1>Tth4, the EMS determines that the outlet water temperature of the engine is high, the cylinder has accumulated a certain amount of heat, and the oil temperature meets the thermal engine requirements. At this time, it is necessary to give priority to the uniformity of the temperature inside the cylinder, so a certain circulation flow is required. At this time, it can be determined that the preset switching conditions corresponding to the diversion mode are met, and the diversion mode is determined as the target mode. In this example, when the EMS controls the engine to enter the diversion mode, the thermostat adaptively enters the small circulation state, the EMS controls the switch valve to open, and controls the water pump to enter the first operating mode according to the engine operating conditions and the outlet water temperature, so that the engine enters the diversion mode. The first operating mode refers to a mode of adaptive adjustment of the water pump according to the engine operating conditions (including but not limited to engine speed and engine load conditions) and the outlet water temperature T1, specifically the operating condition adjustment mode corresponding to the diversion mode.

[0140] As an example, when the EMS needs to control the engine from the second thermal engine mode Set_model=2 or the first heating mode Set_model=2.5 to the diversion mode Set_model=3, the thermostat enters the small circulation state, that is, the coolant output by the cylinder can directly enter the water pump through the thermostat without passing through the radiator to enter the water pump. At this time, the hot water in the cylinder flows back to the water pump to maintain a higher temperature, which has a better effect on maintaining the engine oil temperature; at this time, the EMS controls the switch valve to open (that is, p_target_bpv=on), opens the warm air branch, and allows the warm air branch to participate in the coolant circulation. At this time, the hot water in the cylinder head can flow through the warm air core to provide minimum heat dissipation for the cylinder head; and, the EMS needs to control the water pump to enter the first operating mode according to the engine operating conditions and the outlet water temperature, so as to adaptively adjust the speed of the water pump according to the engine operating conditions. The first operating mode here refers to the process of determining and controlling the target speed of the electronic water source based on the engine operating conditions and outlet water temperature in the split mode. For example, one speed can be determined based on the engine operating conditions by querying the operating speed table corresponding to the split mode, and another speed can be determined based on the outlet water temperature by querying the temperature speed table corresponding to the split mode. The two speeds are then compared to determine the target speed, so that the water pump operation can be controlled based on the target speed. In this example, the reasons for increasing the initial opening temperature of the thermostat (determined by the physical properties of paraffin) are as follows: First, unless necessary, the internal temperature of the engine body is increased as much as possible, which increases the oil temperature and reduces the oil viscosity, thereby achieving low friction. Second, under this system architecture, the heater core can be used as a radiator to achieve low heat flux heat exchange. When the outlet water temperature is at a low level, heat exchange can be achieved externally without opening the radiator (equivalent to a two-speed radiator, where the heater is a low-speed heat exchange, and directly opening the radiator will cause excessive heat exchange), thereby ensuring temperature uniformity.

[0141] In this example, when the engine enters the diversion mode from the second thermal engine mode or the first heating mode, the coolant output by the water pump enters the cylinder block; the coolant in the cylinder block can be directly transmitted to the cylinder head and transmitted to the cylinder head through the supercharger; the coolant in the cylinder head can flow back to the water pump through the cylinder block and the thermostat, and flow back to the water pump through the switch valve and the heater core. According to the engine operating conditions and the outlet water temperature, the water pump is controlled to enter the first operating mode to adaptively adjust the speed of the water pump according to the engine operating conditions, so that the engine enters the diversion mode Set_model=3, so as to achieve the purpose of diversion between the cylinder block and the cylinder head, and ensure the uniformity of the internal temperature of the cylinder block and the cylinder head.

[0142] In one embodiment, the engine operating conditions include engine speed and engine load;

[0143] Step S802, i.e., controlling the water pump to enter the first operating mode according to the engine operating condition and the outlet water temperature, includes:

[0144] (1) querying a first operating condition speed table based on the engine speed and the engine load to obtain a first speed;

[0145] (2) querying a third temperature-speed table based on the engine outlet water temperature to obtain a second speed;

[0146] (3) The larger value between the first speed and the second speed is determined as the target speed, and the water pump is controlled to operate based on the target speed.

[0147] As an example, the EMS may obtain engine speed and engine load, and based on these engine operating conditions, such as engine speed and engine load, query a pre-set first operating condition speed table to obtain a first speed corresponding to the engine speed and engine load from the first operating condition speed table. The first operating condition speed table is a pre-set three-dimensional mapping table in split mode that reflects the correspondence between engine speed, engine load, and water pump speed, and can be represented by n_target_eng_ewp_M3. Accordingly, the first speed is the water pump speed determined by the table to match the engine speed and engine load.

[0148] As an example, the EMS can obtain the engine's outlet water temperature T1 and, based on this outlet water temperature T1, query a pre-set third temperature-speed table to obtain the second speed corresponding to outlet water temperature T1. The third temperature-speed table is a two-dimensional mapping table representing the correspondence between outlet water temperature T1 and water pump speed in diversion mode, and can be represented by Map_n_target_T1_ewp_M3. Accordingly, the second speed is the water pump speed corresponding to outlet water temperature T1, as determined by the table lookup.

[0149] As an example, after obtaining the first and second speeds from a table lookup, the EMS can compare the two and determine the larger of the two speeds as the target speed. The water pump is then controlled to operate based on the target speed. Understandably, when the engine enters split-flow mode, the on-off valve opens, allowing the heater branch to participate in the coolant circulation. Hot water in the cylinder head can flow through the heater core, providing minimal heat dissipation for the cylinder head. The thermostat enters a small loop, allowing hot water in the cylinder to flow back to the water pump, maintaining a higher temperature and effectively maintaining engine oil temperature. At this time, the water pump is controlled to operate based on the larger of the first and second speeds to match the engine operating conditions and meet the corresponding heat requirements.

[0150] In one embodiment, as shown in FIG9 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0151] S901: When the engine is in the diversion mode, obtain the engine outlet water temperature and air conditioning demand;

[0152] S902: If the outlet water temperature is greater than the fifth temperature threshold and the air conditioning demand is for heating, the second heating mode is determined as the target mode, the switch valve is controlled to open, and according to the engine operating condition and the outlet water temperature, the water pump is controlled to enter the second operating mode and the thermostat enters the small circulation state.

[0153] Wherein, step S901 is a specific implementation of step S201, and step S902 is a specific implementation of step S202.

[0154] The fifth temperature threshold, represented by Tth5, is a preset threshold used to assess whether to switch to the second heating mode. Generally, the fifth temperature threshold, Tth5, is greater than the fourth temperature threshold, Tth4. The second heating mode, which controls the operation of the heater core to meet heating needs, is between the diversion mode and the normal mode and is represented by Set_model = 3.5.

[0155] As an example, in step S901, when the engine is in the diversion mode Set_model=3, the EMS can obtain the engine outlet water temperature T1 collected in the diversion mode and the air-conditioning demand sent by the air-conditioning system HVAC, so as to evaluate whether it is necessary to enter the second heating mode based on the outlet water temperature T1 and the air-conditioning demand.

[0156] As an example, in step S902, when the outlet water temperature is greater than the fifth temperature threshold (i.e., T2 > Tth5) and the air conditioning demand indicates a heating demand (Bit_heater = 1), the EMS determines that the engine outlet water temperature is high, the engine is essentially fully heated, and can provide sufficient warm air. Furthermore, the EMS analyzes and determines the air conditioning demand during the HVAC transmission process of the air conditioning system. When it determines that the air conditioning demand indicates a heating demand, it determines that the preset switching conditions corresponding to the second heating mode are met and that the engine needs to be controlled to enter the second heating mode, setting its mode status bit to Set_model = 3.5. Accordingly, if the outlet water temperature is not greater than the fifth temperature threshold, the EMS determines that the engine is not fully heated and cannot provide sufficient warm air, and will not switch to the second heating mode. Alternatively, if the EMS analyzes the air conditioning demand as no heating demand (Bit_heater = 0), the EMS does not need to consider the heating demand and will not enter the second heating mode.

[0157] As an example, when the EMS needs to control the engine from the diversion mode Set_model=3 to the second heating mode Set_model=3.5, the thermostat enters the small circulation state, that is, the coolant output by the cylinder can directly enter the water pump through the thermostat without passing through the radiator to enter the water pump. At this time, the coolant in the warm air branch and the coolant output by the thermostat through the small circulation are both input into the water pump; at this time, the EMS needs to control the switch valve to open (that is, p_target_bpv=on), open the warm air branch, so that the warm air branch participates in the coolant circulation; and, the EMS needs to control the water pump to enter the second working mode according to the engine operating conditions and the outlet water temperature, so that the engine enters the second heating mode. The second working mode refers to a mode of adaptive adjustment of the water pump according to the engine operating conditions (including but not limited to engine speed and engine load and other working conditions) and the outlet water temperature T1, specifically the working condition adjustment mode corresponding to the second heating mode. The second operating mode here refers to the process of determining and controlling the target speed of the electronic water source based on the engine operating condition and the outlet water temperature in the second heating mode. For example, one speed can be determined by querying the operating speed table corresponding to the second heating mode based on the engine operating condition, and another speed can be determined by querying the temperature speed table corresponding to the second heating mode based on the outlet water temperature. The two speeds are then compared to determine the target speed so that the water pump can be controlled based on the target speed.

[0158] In this example, when the engine switches from split mode to the second heating mode, coolant from the water pump enters the cylinder block. The coolant in the cylinder block is then transferred directly to the cylinder head and then to the cylinder head via the supercharger. The coolant in the cylinder head then flows back to the water pump through the cylinder block and thermostat, and then back to the water pump through the on / off valve and heater core. Based on the engine operating conditions and outlet water temperature, the water pump is controlled to enter the second operating mode, causing the engine to enter the second heating mode (Set_model=3.5). Since the coolant temperature in the engine is higher when the engine enters the second heating mode, it can pass through the heater core to meet the heating requirement. Furthermore, the EMS can send a blower enable signal to the HVAC system, enabling the system to control the blower. Specifically, the status bit Bit_HtqForb is set to 0 and sent to the HVAC system, causing the HVAC system to activate the blower and ensure a warm air effect.

[0159] In one embodiment, the engine operating conditions include engine speed and engine load;

[0160] Step S902, i.e., controlling the water pump to enter the second operating mode according to the engine operating condition and the outlet water temperature, includes:

[0161] (1) querying a second operating condition speed table based on the engine speed and the engine load to obtain a third speed;

[0162] (2) querying a fourth temperature-speed table based on the engine outlet water temperature to obtain a fourth speed;

[0163] (3) The larger value among the third speed, the fourth speed, and the second calibrated speed is determined as the target speed, and the water pump is controlled to operate based on the target speed.

[0164] As an example, the EMS can obtain engine speed and engine load, and based on this information, query a pre-configured second-operating-condition speed table to obtain a third speed corresponding to the engine speed and load from the second operating-condition speed table. The first operating-condition speed table is a three-dimensional mapping table representing the correspondence between engine speed, engine load, and water pump speed in the second heating mode, and can be represented by n_target_eng_ewp_M3. Accordingly, the third speed is the water pump speed determined by the table lookup to match the engine speed and load.

[0165] As an example, the EMS can obtain the engine's outlet water temperature T1 and, based on this outlet water temperature T1, query a pre-set fourth temperature-speed table to obtain a fourth speed corresponding to outlet water temperature T1. The fourth temperature-speed table is a two-dimensional mapping table representing the correspondence between outlet water temperature T1 and water pump speed in the second heating mode. This table can be represented by Map_n_target_T1_ewp_M3. Accordingly, the fourth speed is the water pump speed corresponding to outlet water temperature T1, as determined by the table lookup.

[0166] Among them, the second calibrated speed refers to the calibrated speed corresponding to the pre-calibrated first heating mode. The calibrated speed here is the speed at which the water pump rotation needs to be controlled. For example, the pre-calibrated second calibrated speed can be set to 50% of the maximum speed, which can provide a flow rate that supports warm air requirements.

[0167] As an example, after obtaining the third and fourth speeds from a table lookup, the EMS can compare the third, fourth, and second calibrated speeds and determine the larger of the three, fourth, and second calibrated speeds as the target speed to ensure that the determined target speed can simultaneously meet all requirements. The EMS then controls the water pump to operate based on the target speed, causing the engine to enter the second heating mode. Understandably, when the engine enters the second heating mode, the on-off valve opens, allowing the heater branch to participate in the coolant circulation. Hot water in the cylinder head can flow through the heater core, providing minimal heat dissipation for the cylinder head. The thermostat enters a small loop, allowing hot water in the cylinder to flow back to the water pump, maintaining a higher temperature and effectively maintaining the engine oil temperature. At this time, the water pump is controlled to operate based on the larger of the third, fourth, and second calibrated speeds to match the engine operating conditions and heating requirements, thereby meeting the corresponding heat requirements.

[0168] In one embodiment, as shown in FIG10 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0169] S1001: When the engine is in the split mode or the second heating mode, obtain the outlet water temperature of the engine;

[0170] S1002: If the outlet water temperature is greater than the sixth temperature threshold, the normal mode is determined as the target mode, the switch valve is controlled to be closed, and the water pump is controlled to enter the third operating mode according to the engine operating condition and the outlet water temperature, and the thermostat enters the small circulation state or the large circulation state.

[0171] Wherein, step S1001 is a specific implementation of step S201, and step S1002 is a specific implementation of step S202.

[0172] The sixth temperature threshold, represented by Tth6, is a preset threshold used to assess whether to switch to normal mode. Generally, Tth6 is greater than Tth5. Normal mode occurs when both the cylinder block and cylinder head reach normal operating temperatures and have a relatively uniform temperature distribution. Set_model = 4 represents this mode.

[0173] As an example, in step S1001, when the engine is in the diversion mode Set_model=3 or the second heating mode Set_model=3.5, the EMS can obtain the outlet water temperature T1 of the engine, and compare the outlet water temperature T1 with the preset sixth temperature threshold, so as to determine whether the preset switching conditions corresponding to the normal mode are met based on the comparison result.

[0174] As an example, in step S1002, when the outlet water temperature is greater than the sixth temperature threshold (i.e., T1>Tth6), the EMS determines that the engine has completed the warm-up process as a whole, the cylinder block and cylinder head have reached normal operating temperatures, and the temperature distribution is uniform. It can be determined that the preset switching conditions corresponding to the normal mode are met, and the normal mode is determined as the target mode. At this time, the thermostat adaptively adjusts its state, controls the switch valve to close, and controls the water pump to enter the third operating mode according to the engine operating conditions and the outlet water temperature, so that the engine enters the normal mode. The second operating mode refers to the mode of adaptive adjustment of the water pump according to the engine operating conditions (including but not limited to engine speed and engine load conditions) and the outlet water temperature T1, specifically the operating condition adjustment mode corresponding to the normal mode. The normal mode here refers to the operating mode of closed-loop control based on the water temperature.

[0175] As an example, when the EMS needs to control the engine from the bypass mode Set_model=3 or the second heating mode Set_model=2.5 to the normal mode Set_model=4, the thermostat adaptively adjusts the opening ratio, that is, the thermostat adjusts itself based on its physical characteristics under the change of water temperature, adjusts the opening ratio of the large cycle and the small cycle, so that the coolant output by the cylinder can be directly returned to the water pump through the small cycle, or returned to the water pump through the radiator. At this time, the EMS controls the switch valve to close (i.e. p_target_bpv=off), closes the warm air branch, so that the warm air branch does not participate in the coolant circulation, ensures that the warm air core does not bypass, and ensures that under high temperature conditions, the radiator has enough coolant; and, according to the engine operating conditions and outlet water temperature, the EMS needs to control the water pump to enter the third operating mode to adjust its target speed according to the outlet water temperature T1 and the engine operating conditions, so as to achieve adaptive adjustment. The third operating mode here refers to the process of determining and controlling the target speed of the electronic water source based on the engine operating condition and the outlet water temperature in normal mode. For example, a speed can be determined by querying the operating speed table corresponding to the normal mode based on the engine operating condition, and the corresponding speed correction value can be determined by looking up the table based on the outlet water temperature. The speed correction value is then used to correct the above speed to determine the target speed, so that the water pump operation can be controlled based on the target speed.

[0176] In this example, when the engine enters normal mode from the bypass mode or the second heating mode, the coolant output by the water pump enters the cylinder block; the coolant in the cylinder block can be directly transmitted to the cylinder head and then transmitted to the cylinder head through the supercharger; the coolant in the cylinder head returns to the cylinder block, and then returns to the water pump after the thermostat adaptively adjusts the opening ratio, entering the first operating mode, so that the engine enters the normal mode Set_model=4, so as to achieve the purpose of closed-loop control of the water temperature.

[0177] In one embodiment, the engine operating conditions include engine speed and engine load;

[0178] In steps S402, S502, and S1002, the water pump is controlled to enter the third operating mode according to the engine operating condition and the outlet water temperature, including:

[0179] (1) querying a first operating temperature table based on the engine speed and the engine load to obtain a first temperature;

[0180] (2) querying a third operating condition speed table based on the engine speed and the engine load to obtain a fifth speed;

[0181] (3) obtaining a target temperature difference based on the engine outlet water temperature and the first temperature;

[0182] (4) querying a fifth temperature-speed table based on the difference between the engine outlet water temperature and the target temperature to obtain a speed correction value;

[0183] (5) Determine a target speed based on the fifth speed and the speed correction value, and control the water pump to operate based on the target speed.

[0184] As an example, the EMS can obtain the engine speed EngSpd and the engine load EngTorq, and based on the engine speed EngSpd and the engine load EngTorq, query the pre-set first operating temperature table, and obtain the first temperature corresponding to the engine speed EngSpd and the engine load EngTorq from the first operating temperature table. The first operating temperature table is a three-dimensional mapping table used to reflect the correspondence between engine speed, engine load, and target water inlet temperature in normal mode, and can be represented by Map_TempTarget_eng_M4. Accordingly, the first temperature is the target water inlet temperature that matches the engine speed and engine load, as determined by the lookup table, and can be represented by Target_temp_M4. The target water inlet temperature here is the water inlet temperature of the coolant in the engine that needs to be controlled under the engine operating conditions corresponding to the engine speed and engine load.

[0185] As an example, the EMS can obtain engine speed EngSpd and engine load EngTorq, and based on these values, query a pre-set third-operating-condition speed table to obtain a fifth speed corresponding to engine speed EngSpd and engine load EngTorq from the third-operating-condition speed table. The third-operating-condition speed table is a three-dimensional mapping table representing the correspondence between engine speed, engine load, and water pump speed in normal mode, and can be represented by Map_pre_nTarget_ewp_M4. Accordingly, the fifth speed is the water pump speed determined by the table lookup to match the engine speed and load, and can be represented by Target_pre_nEWP_M4.

[0186] As an example, the EMS may obtain the outlet water temperature T1 of the engine, calculate the temperature difference between the outlet water temperature T1 and the first temperature Target_temp_M4, and determine the difference between the outlet water temperature T1 and the first temperature Target_temp_M4 as the target temperature difference, which may be expressed as Tdiff_M4, ie, Tdiff_M4 = T1 - Target_temp_M4.

[0187] As an example, the EMS can query the fifth temperature-speed table based on the engine's outlet water temperature T1 and the target temperature difference Tdiff_M4. From this table, it retrieves the speed correction value corresponding to the outlet water temperature T1 and the target temperature difference Tdiff_M4. The fifth temperature-speed table is a three-dimensional mapping table representing the correspondence between the outlet water temperature T1, the target temperature difference, and the speed correction value in normal mode, and can be represented by ap_Pset_EWP_M4. Accordingly, the speed correction value, determined from the table lookup, is the speed correction value that matches the outlet water temperature T1 and the target temperature difference Tdiff_M4, and can be represented by P_mod_ewp_M4.

[0188] As an example, the EMS may use the speed correction value P_mod_ewp_M4 to correct the fifth speed arget_pre_nEWP_M4. Specifically, the sum of the speed correction value P_mod_ewp_M4 and the fifth speed arget_pre_nEWP_M4 is determined as the target speed, and the water pump is controlled to operate based on the target speed.

[0189] In this example, when the engine enters normal mode, the target speed needs to be dynamically adjusted based on the engine speed EngSpd, the engine load EngTorq, and the engine outlet water temperature T1. The water pump is controlled to operate based on the target speed so that the water pump rotation is related to the engine operating conditions and the outlet water temperature T1, thereby achieving the purpose of closed-loop control of the water temperature.

[0190] In one embodiment, as shown in FIG11 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0191] S1101: When the engine is in normal mode, obtain the outlet water temperature and air conditioning demand corresponding to the normal mode;

[0192] S1102: If the outlet water temperature is greater than the seventh temperature threshold and the air conditioning demand is for heating, the third heating mode is determined as the target mode, the switch valve is controlled to be closed, and the water pump is controlled to enter the speed adjustment state according to the current speed of the water pump, and the thermostat enters the small circulation state or the large circulation state.

[0193] Wherein, step S1101 is a specific implementation of step S201, and step S1102 is a specific implementation of step S202.

[0194] The seventh temperature threshold is a preset threshold used to assess whether to switch to the third heating mode, and is represented by Tth7. Generally, the seventh temperature threshold Tth7 is greater than the sixth temperature threshold Tth6. The third heating mode is used to control the operation of the heater core to meet heating needs. It is an operating mode after the normal mode and is represented by Set_model = 4.5.

[0195] As an example, in step S1101, when the engine is in normal mode Set_model=4, the EMS can obtain the engine outlet water temperature T1 collected in normal mode and the air-conditioning demand sent by the air-conditioning system HVAC, so as to evaluate whether it is necessary to enter the third heating mode based on the outlet water temperature T1 and the air-conditioning demand.

[0196] As an example, in step S1102, if the outlet water temperature is greater than the seventh temperature threshold (i.e., T1 > Tth7) and the air conditioning demand indicates a heating demand (Bit_heater = 1), the EMS determines that the engine has completed its entire warm-up process, that the cylinder block and cylinder head have reached normal operating temperatures, and that the heat is evenly distributed, thus enabling sufficient warm air to be provided. Furthermore, the EMS analyzes and determines the air conditioning demand during the HVAC transmission process of the air conditioning system. If the air conditioning demand indicates a heating demand, the EMS determines that the preset switching conditions corresponding to the third heating mode are met, identifies the third heating mode as the target mode, controls the engine to enter the third heating mode, and sets its mode status bit to Set_model = 4.5. Accordingly, if the outlet water temperature is not greater than the seventh temperature threshold, the EMS determines that the engine has not completed its warm-up process and cannot provide sufficient warm air, and thus does not switch to the third heating mode. Alternatively, if the EMS analyzes the air conditioning demand as no heating demand (Bit_heater = 0), the EMS does not consider the heating demand and does not enter the third heating mode.

[0197] As an example, when the EMS needs to control the engine from the normal mode Set_model=4 to the third heating mode Set_model=4.5, the thermostat adaptively adjusts the state, that is, the thermostat adjusts itself based on its physical characteristics under the change of water temperature, and adjusts the opening ratio of the large cycle and the small cycle, so that the coolant output by the cylinder can be directly returned to the water pump through the small cycle, that is, enter the small cycle state, or return to the water pump through the radiator, that is, enter the large cycle state. At this time, the EMS needs to control the switch valve to close (that is, p_target_bpv=off), close the warm air branch, so that the warm air branch does not participate in the coolant circulation, and ensure that the warm air core does not divert, so as to ensure that the radiator has enough coolant under high temperature conditions. In addition, the EMS needs to perform adaptive speed adjustment according to the current speed of the water pump. For example, according to the actual situation, it is adjusted up or down based on the current speed to meet the cooling needs in the third heating mode.

[0198] In this example, when the engine enters the third heating mode from normal mode, coolant from the water pump enters the cylinder block. The coolant in the cylinder block is then directly transferred to the cylinder head and then to the cylinder head via the supercharger. The coolant in the cylinder head then flows back to the cylinder block, where it is then adaptively adjusted by the thermostat to flow back to the water pump. Based on the water pump's current speed, the water pump is controlled to enter speed regulation, causing the engine to enter the third heating mode (Set_model=4.5). Since the engine coolant temperature is high when entering the third heating mode, it passes through the heater core and meets the heating requirement. Furthermore, the EMS can send a blower enable signal to the HVAC system, enabling the system to control the blower. Specifically, the status bit Bit_HtqForb is set to 0 and sent to the HVAC system, causing the HVAC system to activate the blower and ensure a warm air effect.

[0199] In one embodiment, step S1102, controlling the water pump to enter a speed regulation mode, includes:

[0200] The current speed of the water pump is obtained, the larger value of the current speed and the second calibrated speed is determined as the target speed, and the water pump is controlled to operate based on the target speed.

[0201] The current speed refers to the speed at which the water pump is currently running. The second calibrated speed refers to the speed that needs to be achieved in the third heating mode that is preset.

[0202] As an example, when the EMS needs to control the engine to enter the third heating mode, it first obtains the current water pump speed. Then, it compares this current speed with the second calibrated speed. The larger of the current speed and the second calibrated speed is determined as the target speed. The water pump is then controlled to operate based on the target speed to meet the heating demand. In this example, the larger of the current speed and the second calibrated speed is determined as the target speed to ensure that the coolant flow output by the water pump at the target speed can simultaneously meet all demands.

[0203] In one embodiment, as shown in FIG12 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0204] S1201: When the engine is in the normal mode or the third heating mode, obtain the engine outlet water temperature;

[0205] S1202: If the outlet water temperature is greater than the eighth temperature threshold, the overheating mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to operate based on the third calibrated speed, and the thermostat enters the large circulation state.

[0206] Herein, step S1201 is a specific implementation of step S201, and step S1202 is a specific implementation of step S202.

[0207] The eighth temperature threshold, denoted by Tth8, is a pre-set threshold used to assess whether to switch to overheat mode. Generally, the eighth temperature threshold, Tth8, is greater than the seventh temperature threshold, Tth7. The third calibrated speed is the pre-calibrated target speed for controlling water pump operation. This third calibrated speed can be 100% of the maximum speed, i.e., n_target_ewp = 100%, or a speed close to the maximum speed. Overheat mode refers to an operating mode where the cylinder block and cylinder head are relatively high, presenting a risk of overheating. Set_model = 5 is used to indicate this.

[0208] As an example, in step S1201, when the engine is in the normal mode Set_model=4 or the third heating mode Set_model=4.5, the EMS can obtain the outlet water temperature T1 of the engine, and compare the outlet water temperature T1 with the preset eighth temperature threshold, so as to determine whether the preset switching conditions corresponding to the normal mode are met based on the comparison result.

[0209] As an example, in step S1202, when outlet water temperature T1 exceeds the eighth temperature threshold, the EMS determines that the engine as a whole is at risk of overheating and needs to direct all flow to the radiator to ensure adequate cooling performance. At this point, the preset switching conditions for overheat mode are determined to be met, and overheat mode can be set as the target mode. At this point, the thermostat enters a large circulation state, meaning that all coolant output from the cylinder flows through the radiator and then back to the water pump. At this point, the EMS controls the on-off valve to close (i.e., p_target_bpv = off), shutting off the warm air branch so that it does not participate in the coolant circulation and ensuring that the warm air core does not divert flow, ensuring sufficient coolant to the radiator under high-temperature conditions. Furthermore, the EMS controls the water pump to operate at a third calibrated speed, i.e., n_target_ewp = 100%, so that all coolant output from the cylinder flows through the radiator and enters the water pump, operating at maximum speed to achieve rapid heat dissipation and cooling.

[0210] In this example, when the engine enters the overheat mode from the normal mode or the third heating mode, the coolant output by the water pump enters the cylinder body; the coolant in the cylinder body can be directly transmitted to the cylinder head and then transmitted to the cylinder head through the supercharger; the coolant in the cylinder head is all poured into the radiator through the thermostat and then flows back to the water pump, so that the water pump operates based on the third calibrated speed, causing the engine to enter the overheat mode Set_model=5, so as to achieve rapid heat dissipation and quickly reduce the temperature in the engine.

[0211] In one embodiment, as shown in FIG13 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0212] S1301: When the engine is in the current mode, obtain the engine speed and vehicle status;

[0213] S1302: If the engine speed is zero and the vehicle is powered on, the insulation and waste heat utilization mode is determined as the target mode, and the engine outlet water temperature and air conditioning demand are obtained;

[0214] S1303: If the outlet water temperature is greater than or equal to the warm air permissible threshold, the outlet water temperature is less than the first overtemperature threshold, and the air conditioning demand is heating, the on-off valve is controlled to open and the water pump is controlled to stop, so that the engine enters the residual heat utilization state in the heat preservation and residual heat utilization mode, and the thermostat enters the small circulation state;

[0215] S1304: If the outlet water temperature is lower than the warm air threshold, or the air conditioning demand is no heating demand, the switch valve is controlled to close and the water pump is controlled to stop working, so that the engine enters the insulation state in the insulation and waste heat utilization mode, and the thermostat enters the small circulation state.

[0216] Among them, step S1301 is a specific implementation manner of step S201, and steps S1302 - S1304 are a specific implementation manner of step S202.

[0217] Among them, the allowable warm air threshold is a temperature threshold pre - set for evaluating whether there is sufficient waste heat for utilization, which can be represented by Tth9. The first over - temperature threshold is a threshold pre - set for evaluating whether there is an over - heat risk, which can be represented by To1. The fourth calibrated speed is the speed at which the water pump needs to operate when controlling the engine to enter the waste heat utilization state. As an example, the fourth calibrated speed can be set to 0. The heat preservation and waste heat utilization mode is a mode for realizing the waste heat utilization or heat preservation function, which can be represented by Set_model = 6.

[0218] As an example, when the engine is in the current mode, that is, in other modes except the heat preservation and waste heat utilization mode, the EMS obtains the engine speed and the vehicle state, so as to evaluate whether the pre - set switching conditions of the heat preservation and waste heat utilization mode are met according to the engine speed and the vehicle state.

[0219] As an example, when the engine speed is zero and the vehicle state is the power - on state (such as B_start = 1), the EMS can determine that the vehicle is in the start - stop during the hybrid process, the vehicle power demand is low or the battery level is high, and there is no need to control the engine to start. It is considered that it meets the pre - set switching conditions corresponding to the heat preservation and waste heat utilization mode Set_model = 6, and determines the heat preservation and waste heat utilization mode as the target mode. It is necessary to obtain the outlet water temperature T1 of the engine and the air - conditioning demand in real - time, so as to control the on - off valve and the water pump according to the outlet water temperature T1 and the air - conditioning demand.

[0220] As an example, when the EMS determines that the pre - set switching conditions corresponding to the heat preservation and waste heat utilization mode are met, it can compare the obtained outlet water temperature T1 with the allowable warm air threshold and the first over - temperature threshold. If the outlet water temperature is greater than or equal to the allowable warm air threshold and the outlet water temperature is less than the first over - temperature threshold, that is, Tth9 ≤ T1 < To1, it is determined that there is sufficient waste heat inside the engine for utilization and there is no over - heat risk. At this time, the waste heat utilization scenario can be considered. At this time, if the air - conditioning demand sent by the air - conditioning system is for heating demand, the on - off valve can be controlled to open (that is, the target opening degree p_target_bpv of the on - off valve is set to on), so that the thermostat enters the small - cycle state, and the coolant output from the cylinder block is directly returned to the water pump through the thermostat. At this time, the EMS needs to control the water pump to stop working, so that the engine enters the waste heat utilization state in the heat preservation and waste heat utilization mode, and the hot water inside the engine can be taken out through the heater core for heating to achieve the purpose of waste heat utilization.

[0221] As an example, when the EMS determines that the preset switching condition corresponding to the heat preservation and waste heat utilization mode is met, it can compare the obtained outlet water temperature T1 with the warm air allowable threshold and the first over-temperature threshold. If the outlet water temperature is less than the warm air allowable threshold (i.e., T1 < Tth9), it is determined that there is not enough waste heat in the engine for utilization. At this time, the waste heat utilization scenario cannot be considered. Or, when the EMS receives that the air-conditioning demand sent by the air-conditioning system is no heating demand, the waste heat utilization scenario does not need to be considered either. That is to say, when the outlet water temperature is less than the warm air allowable threshold or the air-conditioning demand is no heating demand, the EMS determines that there is no waste heat utilization scenario. At this time, the thermostat enters the small cycle state, the switch valve can be controlled to close, and the water pump can be controlled to stop working, so that the entire engine cooling system stops heat exchange, and the engine enters the heat preservation state in the heat preservation and waste heat utilization mode.

[0222] In an embodiment, as shown in FIG. 14, a control method for an engine cooling system is provided, which can be applied to a controller. The control method includes:

[0223] S1401: When the engine is in the current mode, obtain the engine speed, vehicle state, and outlet water temperature of the engine corresponding to the current mode;

[0224] S1402: If the engine speed is zero, the vehicle state is the power-on state, and the outlet water temperature is greater than or equal to the first over-temperature threshold, determine the post-start and stop operation mode as the target mode, and control the switch valve and the water pump to enter the first post-operation mode according to the outlet water temperature. [[ID=I10]]

[0225] Among them, step S1401 is a specific implementation manner of step S201, and step S1402 is a specific implementation manner of step S202.

[0226] As an example, when the engine is in the current mode, that is, in other modes except the post-start and stop operation mode, the EMS obtains the engine speed, vehicle state, and outlet water temperature of the engine, so as to evaluate whether the preset switching condition of the post-start and stop operation mode is met according to the engine speed, vehicle state, and outlet water temperature. The post-start and stop operation mode refers to the operation mode after the engine starts and stops, and can be represented by Set_model = 7.

[0227] As an example, when the engine speed is zero, the vehicle is powered on, and the outlet water temperature is greater than or equal to the first overtemperature threshold, the EMS can determine that the vehicle is in the start-stop phase of the hybrid operation, with low power demand or high battery charge. This determines that the preset switching conditions corresponding to the post-start-stop operation mode (Set_model=7) are met, and the post-start-stop operation mode is determined as the target mode. The EMS needs to obtain the engine outlet water temperature T1 in real time to determine the target post-start-stop operation state, thereby controlling the opening or closing of the on-off valve, adaptively adjusting the thermostat, and controlling the operation of the water pump to bring the engine into the target post-start-stop operation state. In this example, when the evaluation conditions corresponding to the post-start-stop operation mode are determined to be met, the target operating state can be evaluated based on the outlet water temperature T1, and the on-off valve, thermostat, and water pump can be controlled and adjusted accordingly to bring the engine into the target post-start-stop operation state.

[0228] In one embodiment, in step S1402, controlling the switch valve and the water pump to enter the first post-operation mode according to the outlet water temperature includes:

[0229] (1) If the outlet water temperature is greater than or equal to the first over-temperature threshold and the outlet water temperature is less than the second over-temperature threshold, the switch valve is controlled to close, a sixth temperature-tachometer is queried based on the outlet water temperature and the ambient temperature to obtain a target speed, the water pump is controlled to operate based on the target speed, and the thermostat is not activated, so that the engine enters the first operating state of the post-start-stop operating mode;

[0230] (2) If the outlet water temperature is greater than or equal to the second over-temperature threshold and the outlet water temperature is less than the third over-temperature threshold, the switch valve is controlled to open, the seventh temperature and speed table is queried based on the outlet water temperature and the ambient temperature to obtain the target speed, the water pump is controlled to operate based on the target speed, and the thermostat is not activated, so that the engine enters the second operating state of the post-start-stop operation mode;

[0231] (3) If the outlet water temperature is greater than or equal to the third over-temperature threshold, the switch valve is controlled to open, and the eighth temperature and speed table is queried based on the outlet water temperature and the ambient temperature to obtain the target speed. The water pump is controlled to operate based on the target speed, and the thermostat enters the large circulation state, so that the engine enters the third operating state of the post-start-stop operating mode.

[0232] The first over-temperature threshold, the second over-temperature threshold, and the third over-temperature threshold are preset thresholds for evaluating overheating risks, and can be represented by To1, To2, and To3, respectively. The first over-temperature threshold is smaller than the second over-temperature threshold, and the second over-temperature threshold is smaller than the third over-temperature threshold, i.e., To1 <To2<To3。

[0233] As an example, after the engine speed, vehicle state, and outlet water temperature meet the preset switching conditions corresponding to the operation mode after start-stop, the EMS determines the operation mode after start-stop as the target mode, and can compare the outlet water temperature with the first over-temperature threshold, the second over-temperature threshold, and the third over-temperature threshold, so as to determine the target operation state that the engine needs to enter according to the comparison result.

[0234] As an example, when the outlet water temperature is greater than or equal to the first over-temperature threshold and less than the second over-temperature threshold, that is, when To1 ≤ T1 < To2, the EMS determines that the coolant inside the engine needs to circulate, that is, the coolant demand circulates inside the cylinder block, cylinder head, and turbocharger, but the overall risk is low and does not reach the opening condition for the thermostat to work. At this time, the target operation state is determined as the first operation state. At this time, the thermostat does not start, the control switch valve is closed, the sixth temperature speed table is queried based on the outlet water temperature and the ambient temperature to obtain the target speed, and the water pump is controlled to work based on the target speed, so that the engine enters the first operation state of the operation mode after start-stop, that is, the operation state of internal circulation inside the cylinder block, cylinder head, and turbocharger. Among them, the sixth temperature speed table refers to a three-dimensional mapping table based on the relationship between the outlet water temperature T1, the ambient temperature T_amb, and the water pump speed in the first operation state of the operation mode after start-stop. The first operation state refers to the operation state where the coolant circulates inside the engine.

[0235] As an example, when the outlet water temperature is greater than or equal to the second over-temperature threshold and less than the third over-temperature threshold, that is, when To2 ≤ T1 < To3, the EMS determines that the coolant inside the engine needs to circulate, that is, the coolant demand circulates inside the cylinder block, cylinder head, and turbocharger, but the overall risk is medium and does not reach the opening condition for the thermostat to work. At this time, the target operation state is determined as the second operation state, the control switch valve is opened, the thermostat does not start, the seventh temperature speed table is queried based on the outlet water temperature and the ambient temperature to obtain the target speed, and the water pump is controlled to work based on the target speed, so that the engine enters the second operation state of the operation mode after start-stop, so as to achieve the heat exchange requirement by low-grade heat exchange through the heater core. Among them, the seventh temperature speed table refers to a three-dimensional mapping table based on the relationship between the outlet water temperature T1, the ambient temperature T_amb, and the water pump speed in the second operation state of the operation mode after start-stop. The second operation state refers to the operation state where the coolant circulates inside the engine and exchanges heat through the heater core.

[0236] As an example, when the outlet water temperature is greater than or equal to the third overtemperature threshold (i.e., T1 ≥ To3), the EMS determines that the engine's internal coolant needs to be circulated and the overall risk is high, meeting the conditions for activating the thermostat. At this point, the EMS determines the target operating state to be the third operating state, controls the on-off valve to open, and the thermostat enters the large circulation state. Based on the outlet water temperature and ambient temperature, the EMS queries the eighth temperature-tachometer to obtain the target speed. The EMS then controls the water pump to operate based on the target speed, causing the engine to enter the third operating state of the post-start / stop mode. This allows all coolant in the post-start / stop mode to dissipate heat through the radiator, helping to reduce the risk of overheating. The eighth temperature-tachometer refers to a three-dimensional mapping table based on the relationship between the outlet water temperature T1, the ambient temperature Tamb, and the water pump speed in the third operating state of the post-start / stop mode. The third operating state refers to an operating state in which the coolant circulates within the engine and exchanges heat through the heater core.

[0237] In one embodiment, as shown in FIG15 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0238] S1501: When the engine is in the current mode, obtain the engine speed, vehicle status, and engine outlet water temperature corresponding to the current mode;

[0239] S1502: If the engine speed is zero, the vehicle is in a powered-off state, and the outlet water temperature is greater than or equal to the first overtemperature threshold, the hybrid post-overheating operation mode is determined as the target mode, and the water pump and the switch valve are controlled to enter the second post-operation mode based on the outlet water temperature.

[0240] Wherein, step S1501 is a specific implementation of step S201, and step S1502 is a specific implementation of step S202.

[0241] As an example, when the engine is in the current mode, the EMS obtains engine speed, vehicle status, and engine outlet water temperature. Based on these information, the EMS assesses whether the pre-set conditions for switching to the post-hybrid overheat mode are met. The post-hybrid overheat mode refers to the operating mode after the engine is hybridized and can be represented by Set_model = 8.

[0242] As an example, when the engine speed is zero, the vehicle is in the power-off state, and the outlet water temperature is greater than or equal to the first over-temperature threshold, the EMS can determine that the vehicle has been shut down and is ready to be powered off. The EMS still has the final post-operation processing time, which has a maximum limit and generally does not exceed 300s. When the vehicle is in the power-off state, there is no power source for charging. If the post-operation processing time is long, it is easy to cause power loss, so it is necessary to constrain the post-operation time.

[0243] It can be determined that during the start-stop period of the hybrid operation, the vehicle's power demand is low or its battery charge is high, thus satisfying the preset switching conditions for the hybrid post-overheat operation mode (Set_model=8). The engine outlet water temperature T1 is acquired in real time. Based on this temperature, the on / off valve and water pump are controlled to enter the second post-operation mode, thus placing the engine in the hybrid post-overheat operation mode. In this example, if the evaluation state corresponding to the post-start-stop operation mode is determined to be satisfied, the on / off valve and water pump are controlled and adjusted accordingly based on the outlet water temperature T1 to place the engine in the hybrid post-overheat operation mode. This limits the duration of the post-operation process and prevents battery loss.

[0244] In one embodiment, in step S1502, controlling the water pump and the switch valve to enter the second post-operation mode according to the outlet water temperature includes:

[0245] (1) querying the ninth temperature speed table and the second temperature operation time table based on the outlet water temperature of the engine to obtain the target speed and the first operation time;

[0246] (2) querying the first temperature opening table and the third temperature operation time table based on the engine outlet water temperature to obtain the target opening and the second operation time;

[0247] (3) controlling the water pump to operate based on the target speed, and controlling the water pump to stop operating when it is detected that the operating time of the water pump reaches a first operating time;

[0248] (4) The on-off valve is controlled to open to the target opening, and when it is monitored that the valve opening time reaches the second operating time, the on-off valve is controlled to reset.

[0249] As an example, the EMS may query a pre-configured ninth temperature-speed table based on the engine's outlet water temperature T1, and obtain a target speed corresponding to the outlet water temperature T1 from the ninth temperature-speed table. This ninth temperature-speed table is a pre-configured two-dimensional mapping table used in the hybrid post-overheat mode to reflect the correspondence between the outlet water temperature T1 and the water pump speed, and can be represented by Map_aftrun_nEWP_M8. Accordingly, the target speed obtained from the table lookup can be represented by n_target_ewp. Furthermore, the EMS may query a pre-configured second temperature-operation table based on the engine's outlet water temperature T1, and obtain the operating time corresponding to the outlet water temperature T1 from the second temperature-operation table, determining this as the first operating time. This second temperature-operation table is a pre-configured two-dimensional mapping table used in the hybrid post-overheat mode to reflect the correspondence between the outlet water temperature T1 and the operating time, and can be represented by Map_aftrun_tEWP_M8. Accordingly, the first operating time obtained from the table lookup can be represented by t_target_ewp.

[0250] As an example, the EMS may query a pre-configured first temperature aperture table based on the engine's outlet water temperature T1 and obtain a target aperture corresponding to the outlet water temperature T1 from the first temperature aperture table. This first temperature aperture table is a pre-configured two-dimensional mapping table used to reflect the correspondence between the outlet water temperature T1 and the valve aperture of the on-off valve in the hybrid post-superheat operation mode, and can be represented by Map_aftrun_pBPV_M8. Furthermore, the EMS may query a pre-configured third temperature operation table based on the engine's outlet water temperature T1 and obtain the operating time corresponding to the outlet water temperature T1 from the third temperature operation table, determining this as the second operating time. This third temperature operation table is a pre-configured two-dimensional mapping table used to reflect the correspondence between the outlet water temperature T1 and the operating time in the hybrid post-superheat operation mode, and can be represented by Map_aftrun_pBPV_M8. Accordingly, the second operating time obtained from the table query can be represented by t_target_bpv.

[0251] As an example, the EMS can control the water pump to operate based on the target speed, monitor the water pump running time in real time, and control the water pump to stop working when the water pump running time reaches the first running time; during the temperature change process, the target opening of the switch valve changes with the water temperature, and the switch valve can be controlled to open to the target opening, and the valve opening time is monitored in real time. When the valve opening time reaches the second running time, the switch valve can be controlled to reset, and the entire vehicle completes the power-off action.

[0252] In one embodiment, as shown in FIG16 , a method for controlling an engine cooling system is provided, which can be applied in a controller. The method includes:

[0253] S1601: When the engine is in the current mode, obtain the air conditioning demand and the target demand corresponding to the switch valve;

[0254] S1602: If the air conditioning demand is cooling demand, the switch valve is controlled to close;

[0255] S1603: If the air conditioning demand is no cooling demand, a target opening is determined based on the current demand and target demand of the switch valve, and the switch valve is controlled to open to the target opening.

[0256] Wherein, step S1501 is a specific implementation of step S201, and step S1502 is a specific implementation of step S202.

[0257] As an example, when the engine is in the current mode, which can be any mode, the EMS can obtain the air-conditioning demand sent by the air-conditioning system HAVC and the target demand of the switch valve sent by other systems. The target demand here can be understood as the demand for controlling the opening degree of the switch valve.

[0258] For example, when the EMS receives an air conditioning request and analyzes it to determine if it's a cooling request, it must prioritize closing the on-off valve to prevent heat from flowing through the heater core, affecting the pipes through radiation and convection, and thus affecting the cooling effect. In this example, the on-off valve can proactively shut off the warm air branch, preventing the warm air flow from affecting the cooling effect during cooling conditions.

[0259] As an example, when the EMS does not receive an air-conditioning demand, or receives an air-conditioning demand but the air-conditioning demand is for no cooling, it can receive a target demand sent by other systems, merge the target demand with the current demand of the switch valve, take the maximum value, determine the target opening corresponding to the maximum value, and then control the switch valve to open to the target opening.

[0260] The engine cooling system presented in this example utilizes a thermal management architecture that accommodates multiple modes and addresses market challenges. Beyond conventional operating modes, its key innovations include: 1. While the thermostat is self-adjusting, a temperature sensor measures the outlet water temperature, enabling differential control of the on / off valve and water pump, thereby enabling control and switching between multiple functional modes at a low cost. 2. This solution cleverly utilizes the heater core as a low-range radiator, serving as a transition point between the thermostat's small and large circulation modes. This allows for a delayed initial opening of the thermostat. By increasing the initial opening temperature of the thermostat, the cylinder wall and oil temperatures are raised, improving oil viscosity and friction. In this mode, the on / off valve effectively achieves a degree of flow diversion between the cylinder block and cylinder head. 3. The supercharger draws water from the cylinder block, which then flows upward into the cylinder head, eliminating the need for an overflow pipe. Fourth, during shutdown and hot soak conditions, the heater core and radiator can be operated in second gear based on different water temperatures. For example, this allows switching between start-stop and hybrid overheat modes. Fifth, the system can proactively shut off the warm air branch via a switch valve. This prevents the warm air flow from affecting the cooling effect during air conditioning and cooling operations, eliminating the need for additional valves and helping to save costs.

[0261] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0262] In one embodiment, a controller is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the engine cooling system control method in the above-described embodiment is implemented, such as steps S201 to S202 shown in FIG. 2 . To avoid repetition, these steps are not described here.

[0263] In one embodiment, a car is provided, comprising the engine cooling system of the above embodiment, or comprising the above controller. The controller can implement the engine cooling system control method of the above embodiment, such as steps S201 to S202 shown in FIG. 2 , which will not be described again here to avoid repetition.

[0264] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the engine cooling system control method in the above embodiment is implemented, such as steps S201 to S202 shown in Figure 2. To avoid repetition, they are not repeated here.

[0265] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0266] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0267] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An engine cooling system, characterized in that: Including cylinder block, cylinder head, water pump, heating branch and temperature control branch; The cylinder body and the cylinder head cooperate to form a cylinder circulation branch; The warm air branch is arranged between the first outlet of the cylinder cover and the inlet of the water pump, and comprises a switch valve and a warm air core body arranged in series; The temperature control branch includes a thermostat, the inlet of the thermostat is connected to the first outlet of the cylinder, and the outlet of the thermostat is connected to the inlet of the water pump; The outlet of the water pump is connected to the first inlet of the cylinder body.

2. The engine cooling system according to claim 1, characterized in that: The temperature control branch further comprises a radiator, one end of the radiator is connected to the outlet of the thermostat, and the other end of the radiator is connected to the inlet of the water pump.

3. The engine cooling system according to claim 1, characterized in that: The engine cooling system further comprises a controller, which is connected to the switch valve and the water pump and is used for controlling the operation of the switch valve and the water pump.

4. The engine cooling system according to claim 3, characterized in that: The engine cooling system further comprises a first temperature sensor, which is arranged at the first outlet of the cylinder body and is used to collect the outlet water temperature; The controller is connected to the first temperature sensor, and is used to control the operation of the switch valve and the water pump according to the outlet water temperature sent by the first temperature sensor.

5. The engine cooling system according to claim 1, characterized in that: The engine cooling system further includes a supercharger, wherein an inlet of the supercharger is connected to the second outlet of the cylinder block, and an outlet of the supercharger is connected to an inlet of the cylinder head.

6. The engine cooling system according to claim 1, characterized in that: The cylinder cover is provided with an overflow port; The engine cooling system further comprises an expansion water tank, an inlet of the expansion water tank is connected to the overflow port, and an outlet of the expansion water tank is connected to an inlet of the water pump.

7. The engine cooling system according to claim 1, characterized in that: The engine cooling system further comprises an oil cooler, one end of the oil cooler is connected to the third outlet of the cylinder block, and the other end of the oil cooler is connected to the second inlet of the cylinder block.

8. The engine cooling system according to claim 1, characterized in that: The water pump is an electronic water pump.

9. The engine cooling system according to claim 1, characterized in that: The cylinder circulation branch includes a first pipe and a second pipe connected between the cylinder block and the cylinder head.

10. A method for controlling an engine cooling system, characterized in that: Applicable to the engine cooling system according to any one of claims 1 to 9, comprising: When the engine is in the current mode, the measured data is obtained; If the measured data meets the preset switching conditions, the switchable mode corresponding to the preset switching conditions is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, the water pump is controlled to operate based on the target speed corresponding to the target mode, and the thermostat is adaptively adjusted.

11. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in start mode, obtain the engine speed; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the engine speed is not zero, the pre-processing mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to operate based on the first calibrated speed, and the thermostat enters a small circulation state.

12. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in pre-treatment mode, obtain the flameout interval time; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the flameout interval is less than the first time threshold, the normal mode is determined as the target mode, the switch valve is controlled to be closed, and the water pump is controlled to enter the third operating mode according to the engine operating condition and the outlet water temperature, and the thermostat enters the small circulation state or the large circulation state; If the flameout interval is not less than the first time threshold, the first heat engine mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to enter the intermittent working mode, and the thermostat enters the small circulation state.

13. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the pretreatment mode, obtaining the outlet water temperature of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If at least one of the outlet water temperatures obtained within the preset time is greater than the first temperature threshold, the normal mode is determined as the target mode, the switch valve is controlled to be closed, and the water pump is controlled to enter the third operating mode according to the engine operating condition and the outlet water temperature, and the thermostat enters the small circulation state or the large circulation state; If all the outlet water temperatures obtained within the preset time are not greater than the first temperature threshold, the first heat engine mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to enter the intermittent working mode, and the thermostat enters the small circulation state.

14. The engine cooling system control method according to claim 12 or 13, characterized in that: The controlling the water pump to enter the intermittent working mode comprises: Based on the outlet water temperature of the engine, the first temperature speed table, the first temperature operation time table and the first temperature stop time table are queried to obtain the target speed, the target operation time and the target stop time respectively; Controlling the water pump to operate based on the target speed and monitoring the running time of the water pump; When the running time of the water pump reaches the target running time, controlling the water pump to stop working and monitoring the current stop time; When the current stop time reaches the target stop time, repeatedly controlling the water pump to work based on the target speed, Monitor how long the pump is running.

15. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the first heating mode, obtaining the outlet water temperature of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the second temperature threshold, the second heat engine mode is determined as the target mode, the switch valve is controlled to be closed, and based on the outlet water temperature of the engine, the water pump is controlled to enter a low flow working mode and the thermostat enters a small circulation state.

16. The engine cooling system control method according to claim 15, characterized in that: The step of controlling the water pump to enter a low flow working mode based on the outlet water temperature of the engine comprises: The second temperature-speed table is queried based on the outlet water temperature of the engine to obtain the target speed, and the water pump is controlled to operate based on the target speed.

17. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the second heating mode, obtaining the outlet water temperature and air conditioning demand of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the third temperature threshold and the air conditioning demand is for heating, the first heating mode is determined as the target mode, the switch valve is controlled to open, the water pump is controlled to operate based on the second calibrated speed, and the thermostat enters a small circulation state.

18. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the second heating mode or the first heating mode, obtaining the outlet water temperature of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the fourth temperature threshold, the diversion mode is determined as the target mode, the switch valve is controlled to open, and according to the engine operating condition and the outlet water temperature, the water pump is controlled to enter the first operating mode and the thermostat enters the small circulation state.

19. The engine cooling system control method according to claim 18, characterized in that: The engine operating conditions include engine speed and engine load; The step of controlling the water pump to enter the first operating mode according to the engine operating condition and the outlet water temperature includes: Based on the engine speed and the engine load, query a first operating condition speed table to obtain a first speed; querying a third temperature-speed table based on the outlet water temperature of the engine to obtain a second speed; The larger value of the first speed and the second speed is determined as the target speed, and the water pump is controlled based on the target speed. Standard speed operation.

20. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the split mode, obtain the outlet water temperature and air conditioning demand of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the fifth temperature threshold and the air conditioning demand is for heating, the second heating mode is determined as the target mode, the switch valve is controlled to open, and according to the engine operating condition and the outlet water temperature, the water pump is controlled to enter the second operating mode and the thermostat enters the small circulation state.

21. The engine cooling system control method according to claim 20, characterized in that: The engine operating conditions include engine speed and engine load; The step of controlling the water pump to enter the second operating mode according to the engine operating condition and the outlet water temperature includes: Based on the engine speed and the engine load, query a second operating condition speed table to obtain a third speed; querying a fourth temperature-speed table based on the outlet water temperature of the engine to obtain a fourth speed; A larger value among the third speed, the fourth speed and the second calibrated speed is determined as a target speed, and the water pump is controlled to operate based on the target speed.

22. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the split mode or the second heating mode, obtaining the outlet water temperature of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the sixth temperature threshold, the normal mode is determined as the target mode, the switch valve is controlled to be closed, and the water pump is controlled to enter the third operating mode and the thermostat enters the small circulation state or the large circulation state according to the engine operating condition and the outlet water temperature.

23. The engine cooling system control method according to claim 12, 13 or 22, characterized in that: The engine operating conditions include engine speed and engine load; The step of controlling the water pump to enter the third operating mode according to the engine operating condition and the outlet water temperature includes: Based on the engine speed and the engine load, query a first operating temperature table to obtain a first temperature; querying a third operating condition speed table based on the engine speed and the engine load to obtain a fifth speed; Based on the outlet water temperature of the engine and the first temperature, obtaining a target temperature difference; Based on the outlet water temperature of the engine and the target temperature difference, a fifth temperature-speed table is searched to obtain a speed correction value; A target speed is determined according to the fifth speed and the speed correction value, and the water pump is controlled to operate based on the target speed.

24. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in normal mode, the outlet water temperature and air conditioning demand corresponding to the normal mode are obtained; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the seventh temperature threshold and the air-conditioning demand is for heating, the third heating mode is determined as the target mode, the switch valve is controlled to be closed, and the water pump is controlled to enter the speed regulation condition according to the current speed of the water pump, and the thermostat enters the small circulation state or the large circulation state.

25. The engine cooling system control method according to claim 24, characterized in that: According to the current speed of the water pump, controlling the water pump to enter the speed regulation state includes: The current rotation speed of the water pump is obtained, the larger value of the current rotation speed and the second calibrated rotation speed is determined as the target rotation speed, and the water pump is controlled to operate based on the target rotation speed.

26. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the normal mode or the third heating mode, obtaining the outlet water temperature of the engine; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the outlet water temperature is greater than the eighth temperature threshold, the overheating mode is determined as the target mode, the switch valve is controlled to be closed, the water pump is controlled to operate based on the third calibrated speed, and the thermostat enters a large circulation state.

27. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the current mode, obtain the engine speed and vehicle status; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the engine speed is zero and the vehicle is in a powered-on state, the heat preservation and waste heat utilization mode is determined as the target mode, and the outlet water temperature of the engine and the air conditioning demand are obtained; If the outlet water temperature is greater than or equal to the warm air permissible threshold, the outlet water temperature is less than the first over-temperature threshold, and the air conditioning demand is a heating demand, the switch valve is controlled to open, the water pump is controlled to stop working, so that the engine enters the waste heat utilization state in the heat preservation and waste heat utilization mode, and the thermostat enters the small circulation state; If the outlet water temperature is lower than the warm air allowable threshold, or the air conditioning demand is no heating demand, the switch valve is controlled to close and the water pump is controlled to stop working, so that the engine enters the insulation state in the insulation and waste heat utilization mode, and the thermostat enters the small circulation state.

28. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the current mode, the engine speed, vehicle status and engine outlet water temperature corresponding to the current mode are obtained; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the engine speed is zero, the vehicle state is in the power-on state, and the outlet water temperature is greater than or equal to the first over-temperature threshold, the post-start-stop operation mode is determined as the target mode, the thermostat is not started or enters the large circulation state, and the switch valve and the water pump are controlled to enter the first post-operation mode according to the outlet water temperature.

29. The engine cooling system control method according to claim 28, characterized in that: According to the outlet water temperature, the switch valve, the thermostat and the water pump are controlled to enter the first post-operation mode, including: If the outlet water temperature is greater than or equal to the first over-temperature threshold, and the outlet water temperature is less than the second over-temperature threshold, the switch valve is controlled to be closed, a sixth temperature-speed table is queried based on the outlet water temperature and the ambient temperature to obtain a target speed, the water pump is controlled to operate based on the target speed, and the thermostat is not started, so that the engine enters the first operating state of the post-start-stop operating mode; If the outlet water temperature is greater than or equal to the second over-temperature threshold, and the outlet water temperature is less than the third over-temperature threshold, the switch valve is controlled to open, a seventh temperature-speed table is queried based on the outlet water temperature and the ambient temperature to obtain a target speed, the water pump is controlled to operate based on the target speed, and the thermostat is not started, so that the engine enters the second operating state of the post-start-stop operating mode; If the outlet water temperature is greater than or equal to the third over-temperature threshold, the switch valve is controlled to open, and the eighth temperature and speed table is queried based on the outlet water temperature and the ambient temperature to obtain the target speed. The water pump is controlled to operate based on the target speed, so that the engine enters the third operating state of the start-stop post-operating mode, and the thermostat enters the large circulation state.

30. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the current mode, the engine speed, vehicle status and engine outlet water temperature corresponding to the current mode are obtained; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the engine speed is zero, the vehicle state is in the power-off state, and the outlet water temperature is greater than or equal to the first overtemperature threshold, the hybrid overheating post-operation mode is determined as the target mode, and the water pump and the switch valve are controlled to enter the second post-operation mode according to the outlet water temperature.

31. The engine cooling system control method according to claim 30, characterized in that: According to the outlet water temperature, controlling the water pump and the switch valve to enter the second post-operation mode includes: Based on the outlet water temperature of the engine, a ninth temperature speed table and a second temperature operation time table are queried to obtain a target speed and a first operation duration; Based on the outlet water temperature of the engine, query the first temperature opening table and the third temperature operation time table to obtain the target opening and the second operation time; The water pump is controlled to operate based on the target speed, and when it is detected that the operating time of the water pump reaches the first operating time, the water pump is controlled to operate based on the target speed. The water pump stops working; The switch valve is controlled to open to the target opening, and when it is monitored that the valve opening time reaches the second operating time, the switch valve is controlled to reset.

32. The engine cooling system control method according to claim 10, characterized in that: When the engine is in the current mode, obtaining the measured data includes: When the engine is in the current mode, the air conditioning demand and the target demand corresponding to the switch valve are obtained; If the measured data satisfies the preset switching condition, the switchable mode corresponding to the preset switching condition is determined as the target mode, the switch valve is controlled to operate based on the target opening corresponding to the target mode, and the water pump is controlled to operate based on the target speed corresponding to the target mode, including: If the air conditioning demand is a cooling demand, the switch valve is controlled to be closed; If the air-conditioning demand is no cooling demand, a target opening is determined based on the current demand of the switch valve and the target demand, and the switch valve is controlled to open to the target opening.

33. A controller comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the engine cooling system control method according to any one of claims 10 to 32 is implemented.

34. A car, characterized in that: Includes the engine cooling system as described in any one of claims 1-9, or includes the controller as described in claim 33.

35. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the engine cooling system control method according to any one of claims 10 to 32 is implemented.

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