Engine cooling system and control method thereof

Abstract

The invention discloses an engine cooling system and a control method thereof, and relates to the technical field of engines, the system comprises an upper water jacket, a middle water jacket and a lower water jacket; the lower water jacket comprises an air inlet water jacket, an exhaust water jacket and an exhaust manifold water jacket; a water inlet of the cylinder cover water jacket is respectively communicated with the air inlet water jacket, the exhaust water jacket, the exhaust manifold water jacket and the middle water jacket; the exhaust manifold water jacket and the middle water jacket are respectively communicated with the upper water jacket; the air inlet water jacket and the exhaust water jacket are respectively communicated with a water outlet of the cylinder cover water jacket through the lower-layer main water jacket; the upper water jacket is also communicated with the cylinder cover water jacket water outlet; an electromagnetic valve is further arranged at the water feeding position of the lower water jacket; and the electromagnetic valve realizes the control on the water flow by adjusting the opening degree of the valve. According to the engine cooling system and the control method thereof, the water jacket cooling effect under different working conditions can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, in particular to an engine cooling system and a control method thereof. BACKGROUND

[0002] At present, the engine cooling system with an electronic water pump generally adopts an ECU to control the cooling strategy of the engine. The ECU acquires the water temperature signal of the engine, compares the internal preset cooling strategy (temperature and water pump speed MAP), controls and adjusts the speed of the electronic water pump, and then controls the cooling system of the entire engine in real time. The water jacket of the cylinder head of the engine is an important component of the cooling system, which functions to conduct the heat generated by combustion to the internal water jacket through the cylinder head body, and the heat is taken away by the cooling liquid in the water jacket. Generally, the electronic water pump is controlled as a whole, and the cylinder head water jacket is also a whole structure, that is, the whole is cooled when cooling is required, and partition control cannot be achieved. In a specific working condition, such as the engine with port injection, starting at low temperature, due to the too low intake air temperature and poor combustion atomization effect, especially in the case of water jacket on the intake side of the cylinder head, it will cause starting difficulty and emission exceeding the standard. SUMMARY

[0003] The purpose of the present application is to provide an engine cooling system and a control method thereof, which can achieve the cooling effect of the water jacket under different working conditions.

[0004] The present application provides the following solutions:

[0005] According to one aspect of the present application, an engine cooling system is provided, which comprises:

[0006] an upper water jacket, a middle water jacket and a lower water jacket;

[0007] the lower water jacket comprises an intake water jacket, an exhaust water jacket and an exhaust manifold water jacket;

[0008] the water inlet of the cylinder head water jacket is in communication with the intake water jacket, the exhaust water jacket, the exhaust manifold water jacket and the middle water jacket respectively;

[0009] the exhaust manifold water jacket and the middle water jacket are in communication with the upper water jacket respectively;

[0010] the intake water jacket and the exhaust water jacket are in communication with the water outlet of the cylinder head water jacket through the lower layer total water jacket respectively;

[0011] the upper water jacket is also in communication with the water outlet of the cylinder head water jacket;

[0012] an electromagnetic valve is further arranged on the water position of the lower water jacket;

[0013] The electromagnetic valve controls the size of the water flow by adjusting the opening degree of the valve.

[0014] Optionally, the intake water jacket comprises: a first intake cylinder upper water passage, a second intake cylinder upper water passage, a third intake cylinder upper water passage, and a fourth intake cylinder upper water passage.

[0015] Optionally, the exhaust water jacket comprises: a first exhaust cylinder upper water passage, a second exhaust cylinder upper water passage, a third exhaust cylinder upper water passage, and a fourth exhaust cylinder upper water passage.

[0016] Optionally, the exhaust manifold water jacket comprises: a first exhaust manifold cylinder upper water passage, a second exhaust manifold cylinder upper water passage, a third exhaust manifold cylinder upper water passage, and a fourth exhaust manifold cylinder upper water passage.

[0017] Optionally, the exhaust manifold water jacket further comprises: an exhaust manifold water jacket to upper water jacket passage.

[0018] Optionally, the lower water jacket further comprises: a lower water jacket front end upper water passage, and a lower water jacket water outlet.

[0019] Optionally, the middle water jacket comprises: a middle water jacket upper water passage, and a middle water jacket to upper water jacket passage.

[0020] Optionally, the upper water jacket comprises: an upper water jacket upper water passage, and an upper water jacket water outlet.

[0021] Optionally, the control method further comprises:

[0022] a water temperature sensor, an intake temperature sensor, and an ECU.

[0023] According to the two aspects of the present application, a control method of an engine cooling system is provided, which is applied to the engine cooling system as described above, and the control method comprises:

[0024] In a low-temperature start, by monitoring the intake temperature and the actual water temperature signal, a minimum flow opening signal of the electromagnetic valve is given under a preset strategy; and

[0025] In a normal working condition, by monitoring the intake temperature and the actual water temperature information, a maximum flow opening signal of the electromagnetic valve is given under a preset strategy.

[0026] Through the above-mentioned scheme, the following beneficial technical effects are obtained:

[0027] The application provides a controllable engine cooling system and strategy, by adding an electromagnetic valve at a specific position of a cylinder head water jacket, and controlling the opening of the electromagnetic valve by an ECU, to ensure the water jacket cooling effect under different working conditions. For example, on the intake side water jacket, an electromagnetic valve is added, when starting at low temperature, by monitoring the intake temperature and actual water temperature signals, feeding back to the ECU, under the preset strategy of the ECU, giving the electromagnetic valve the smallest flow opening signal; under normal working conditions, the same monitoring and transmission, under the preset strategy, giving the electromagnetic valve the largest flow opening signal. In this way, a truly controllable cooling system can be realized, and partition control is realized, to provide an effective solution for realizing optimal engine thermal management and performance. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a water flow direction schematic diagram of an engine cooling system provided by one or more embodiments of the application;

[0029] Figure 2 is a structure diagram of an electric control subsystem of the engine cooling system provided by one or more embodiments of the application;

[0030] Figure 3 is an exploded view of a cylinder head of an engine provided by one or more embodiments of the application;

[0031] Figure 4 is an exploded view of a lower water jacket provided by one or more embodiments of the application;

[0032] Figure 5 is an exploded view of a middle water jacket provided by one or more embodiments of the application;

[0033] Figure 6 is an exploded view of an upper water jacket provided by one or more embodiments of the application;

[0034] Figure 7 is a flow chart of a control method of the engine cooling system provided by one or more embodiments of the application;

[0035] Figure 8 is a principle schematic diagram of the control method of the engine cooling system provided by one or more embodiments of the application. DETAILED DESCRIPTION

[0036] The technical solutions of the application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0037] Figure 1The flow direction of the cooling liquid, i.e. water, in the engine cooling system provided by one or more embodiments of the present application is shown. Referring to Figure 1 The engine cooling system comprises: a lower water jacket 1, a middle water jacket 2, and an upper water jacket 3.

[0038] In the present embodiment, the lower water jacket 1 is a relatively broad concept. It is composed of three specific water jackets. They are: an intake water jacket, an exhaust water jacket, and an exhaust manifold water jacket. The intake water jacket corresponds to the intake side of the air path, the exhaust water jacket corresponds to the exhaust side of the air path, and the exhaust manifold water jacket corresponds to the exhaust manifold side of the air path.

[0039] More specifically, the intake water jacket can be specifically divided into: a first intake cylinder upper water passage, a second intake cylinder upper water passage, a third intake cylinder upper water passage, and a fourth intake cylinder upper water passage.

[0040] The exhaust water jacket can be specifically divided into: a first exhaust cylinder upper water passage, a second exhaust cylinder upper water passage, a third exhaust cylinder upper water passage, and a fourth exhaust cylinder upper water passage.

[0041] The exhaust manifold water jacket comprises: a first exhaust manifold cylinder upper water passage, a second exhaust manifold cylinder upper water passage, a third exhaust manifold cylinder upper water passage, and a fourth exhaust manifold cylinder upper water passage.

[0042] In the entire system, the cooling liquid, i.e. water, is recycled. That is, the water used in the previous cooling process will be returned to the various water jackets of the cylinder body again to control the temperature, i.e. cool, of various components in the cylinder body again.

[0043] To achieve the recycling of water flow, a water pump must be provided outside the cylinder body. With the push of the water pump, the cooling water will flow out of the cylinder body and then return to the cylinder body again.

[0044] The advantage of recycling the cooling water is not only water saving, but also fine control of the cooling process. For example, by measuring the water temperature, the current heat content of the cooling liquid can be known, and the control method to be taken next can be determined according to the heat content.

[0045] After the water flow is pushed by the water pump and flows into the engine cylinder body, it is respectively divided into the intake water jacket, the exhaust water jacket, the exhaust manifold water jacket, and the middle water jacket.

[0046] The water flow flows into each water jacket in the cylinder body through the cylinder head water jacket inlet.

[0047] After the water flow flows into the middle water jacket, it flows into the upper water jacket through the communication part between the middle water jacket and the upper water jacket.

[0048] The water flow into the upper water jacket is all from the middle water jacket. That is to say, the upper water jacket has only one inlet of water flow. After the water flow from the middle water jacket into the upper water jacket, the water flow passes through the water outlet of the upper water jacket, flows to the water outlet of the cylinder head water jacket, and then flows out of the cylinder body through the water outlet of the cylinder head water jacket.

[0049] The above describes the flow direction of the upper layer water flow. For the upper layer water flow, a part of the water flow from the lower layer exhaust manifold water jacket passes through the interface between the lower layer and the upper layer and flows into the upper layer water jacket. Another part of the water flow from the middle water jacket passes through the interface between the middle layer and the upper layer and flows into the upper layer water jacket. After the two water flows enter the upper layer water jacket, the water flows pass through the flow guide ribs to realize the front-to-back flow of the upper layer water jacket and finally flow to the upper layer outlet.

[0050] Next, the lower layer water flow is described. The first intake cylinder upper water passage, the second intake cylinder upper water passage, the third intake cylinder upper water passage, and the fourth intake cylinder upper water passage belonging to the intake side are respectively connected with the lower layer total water jacket. The water flowing into the intake water jacket and the exhaust water jacket from the water inlet of the cylinder head water jacket flows into the lower layer total water jacket through the above-mentioned passages.

[0051] After the water flow flows into the lower layer total water jacket, the water flow passes through the water outlet of the lower layer total water jacket, flows to the water outlet of the cylinder head water jacket, and is discharged out of the cylinder body, thereby completing the cooling process of the cylinder body by the lower layer water flow.

[0052] In summary, after the water flow flows into the intake water jacket and the exhaust water jacket, the water flow flows into the lower layer total water jacket from the intake side and the exhaust side respectively, and the lower layer total water jacket flows from front to back to the lower layer outlet.

[0053] It can be seen that the engine cooling system provided by the embodiment is a hierarchical thermal management scheme. The advantage of hierarchical thermal management, that is, hierarchical cooling, is that the control means is more diversified and can realize precise control of heat at different positions in the cylinder body.

[0054] In order to implement the precise control of heat at different positions in the cylinder body, in the technical solutions provided by the various embodiments of the present application, an electric control means for the above-mentioned cooling system is also provided. In the embodiments of the present application, the electric control means for the cooling system is referred to as an electric control subsystem.

[0055] Figure 2 A structure diagram of the electric control subsystem of the engine cooling system provided by one or more embodiments of the present application is shown. Referring to Figure 2 , the electric control subsystem includes an ECU, an intake temperature sensor, a water temperature sensor, and an electromagnetic valve actuator.

[0056] Among them, the intake temperature sensor and the water temperature sensor are parameter sensing components in the subsystem, and they provide the early-stage parameters required in the control process.

[0057] The intake temperature sensor is used to sense the temperature of the intake air in the cylinder head. Since the intake temperature sensor is tasked with sensing the temperature of the intake air in the cylinder, its position is usually set near the intake port. In this way, the distance to the measurement target, i.e. the sensing target, is closer, which is more conducive to the accuracy of the measurement results.

[0058] The water temperature sensor is tasked with sensing the temperature of the coolant, i.e. the water flow, in the cylinder. In the present embodiment, the position of the water temperature sensor is set at the upper water position on the intake side. Specifically, the water temperature sensor can be disposed in the first intake cylinder upper water passage, the second intake cylinder upper water passage, the third intake cylinder upper water passage, or the third intake cylinder upper water passage.

[0059] The ECU is the control center of the above-mentioned subsystem. The ECU should first determine the current state of the system based on the parameters sensed by the various parameter sensing components and returned.

[0060] For example, if the current water temperature is already very high, it means that the engine is already in a normal operating state, and subsequent control measures should be implemented based on the judgment that the engine is operating normally.

[0061] If the current water temperature is not high, it means that the engine has just started and has not yet entered a stable operating state. Other subsequent control measures should be implemented based on the judgment that the engine is not operating stably.

[0062] In the overall architecture of the electronic control subsystem, the mechanism for implementing control measures is the electromagnetic valve. The control task of the electromagnetic valve is to give a flow opening signal, and by giving the flow opening signal, the size of the water flow through each water jacket in the cylinder is adjusted.

[0063] For example, the engine is already in a normal operating state. In this case, all components of the engine are operating normally, and the overall engine will generate considerable heat. Therefore, in this operating condition, the flow opening signal should be adjusted to be large, so that more water flow enters the cylinder to carry away as much heat as possible generated by the cylinder.

[0064] If the engine has just started and has not yet entered a normal operating state. In this case, the engine components are still in the starting stage, and if the water flow is allowed to enter the cylinder in large quantities at this time, it will cause the engine to be insufficiently preheated, affecting the use of the engine. Therefore, in this case, the water flow should be minimized to enter the cylinder.

[0065] It should be noted that in most cases, the flow opening signal received by the electromagnetic valve is a Boolean variable. That is, the flow opening signal takes a value of 0 or 1.

[0066] In other words, under normal engine operating conditions, the flow opening signal has a value of 1. However, under engine starting conditions, the flow opening signal has a value of 0.

[0067] In other embodiments of this example, the flow opening signal is allowed to be a floating-point number. For example, under certain operating conditions, the flow opening signal may be allowed to be 30%, which is 0.3.

[0068] Overall, in the electronic control subsystem, temperature signals are first collected by the intake air temperature sensor and the coolant temperature sensor. After these temperature signals are transmitted to the ECU, the ECU determines the current operating condition of the engine based on the sensed temperature signals, and then provides a specific flow opening signal based on the determined operating condition to adjust the water flow rate, thereby achieving the water jacket cooling effect under different operating conditions.

[0069] Figure 3 An exploded view of the engine cylinder head components is shown. See also... Figure 3 The engine cooling system includes: lower water jacket 1, middle water jacket 2, and upper water jacket 3.

[0070] The lower water jacket 1, middle water jacket 2, and upper water jacket 3 are located inside the cylinder head, in different positions. Generally speaking, the middle water jacket 2 and upper water jacket 3 are positioned closer to the upper part of the cylinder head, while the lower water jacket 1 is positioned closer to the lower part of the cylinder head.

[0071] Along the entire water flow path, the upper water jacket 3, the middle water jacket 2, and the lower water jacket 1 also belong to different positions.

[0072] In the technical solution provided in this embodiment, the upper water jacket 3 and the middle water jacket 2 belong to the upper flow path, while the lower water jacket 1 belongs to the lower liquid flow path.

[0073] pass Figure 3 As can be seen, this embodiment employs a typical stratified cooling technology. The advantage of stratified cooling is that it facilitates spatial stratified control of heat within the cylinder head, thereby achieving a better desired cooling effect.

[0074] Figure 4 An exploded view of the lower water jacket 1 is shown. See also... Figure 4 See Figure 4, the lower water jacket 1 includes: a first intake cylinder upper water passage 11, a second intake cylinder upper water passage 12, a third intake cylinder upper water passage 13, a fourth intake cylinder upper water passage 14, a first exhaust cylinder upper water passage 15, a second exhaust cylinder upper water passage 16, a third exhaust cylinder upper water passage 17, a fourth exhaust cylinder upper water passage 18, a first exhaust manifold cylinder upper water passage 19, a second exhaust manifold cylinder upper water passage 1A, a third exhaust manifold cylinder upper water passage 1B, a fourth exhaust manifold cylinder upper water passage 1C, a lower water jacket front end upper water passage 1D, an exhaust manifold water jacket to upper water jacket passage 1E, and a lower water jacket water outlet 1F.

[0075] In the above component configuration, the first intake cylinder upper water passage 11, the second intake cylinder upper water passage 12, the third intake cylinder upper water passage 13, and the fourth intake cylinder upper water passage 14 belong to the intake water jacket. The first exhaust cylinder upper water passage 15, the second exhaust cylinder upper water passage 16, the third exhaust cylinder upper water passage 17, and the fourth exhaust cylinder upper water passage 18 belong to the exhaust water jacket.

[0076] The first exhaust manifold cylinder upper water passage 19, the second exhaust manifold cylinder upper water passage 1A, the third exhaust manifold cylinder upper water passage 1B, and the fourth exhaust manifold cylinder upper water passage 1C belong to the exhaust manifold water jacket.

[0077] The water flow passing through the exhaust manifold water jacket finally flows into the upper water jacket 3. The water flow passing through the intake water jacket and the exhaust water jacket finally flows into the cylinder head water jacket water outlet through the lower water jacket water outlet 1F.

[0078] Referring to Figure 4 In terms of spatial arrangement, the first intake cylinder upper water passage 11, the second intake cylinder upper water passage 12, the third intake cylinder upper water passage 13, and the fourth intake cylinder upper water passage 14 belonging to the intake water jacket, and the first exhaust cylinder upper water passage 15, the second exhaust cylinder upper water passage 16, the third exhaust cylinder upper water passage 17, the fourth exhaust cylinder upper water passage 18, the lower water jacket front end upper water passage 1D, and the lower water jacket water outlet 1F are distributed on the bottom layer of the lower water jacket.

[0079] The first exhaust manifold cylinder upper water passage 19, the second exhaust manifold cylinder upper water passage 1A, the third exhaust manifold cylinder upper water passage 1B, the fourth exhaust manifold cylinder upper water passage 1C, and the exhaust manifold water jacket to upper water jacket passage 1E are located on the top of the lower water jacket.

[0080] Through the above spatial arrangement, the water flow can effectively flow in the lower space, and effective cooling of the lower water jacket is achieved.

[0081] Figure 5 A component exploded view of the middle water jacket provided by one or more embodiments of the present application is shown. Referring to Figure 5The middle water jacket 2 comprises: a middle water jacket upper water passage 21, a middle water jacket to upper water jacket passage 22.

[0082] The function of the middle water jacket upper water passage 21 is to connect the middle water jacket 2 with the water inlet of the cylinder head. In terms of the setting position, the middle water jacket upper water passage 21 is located at the bottom of the middle water jacket 2.

[0083] The middle water jacket to upper water jacket passage 22 is located at the upper part of the middle water jacket 2. Its function is to connect the middle water jacket 2 with the upper water jacket 3. The water flow flowing into the middle water jacket 2 further flows into the upper water jacket 3 through the connection of the middle water jacket to upper water jacket passage 22.

[0084] It should be noted that the middle water jacket 2 belongs to part of the upper water flow system. Therefore, the water flow flowing through the middle water jacket 2 is part of the upper water flow in the cylinder head.

[0085] In terms of spatial distribution, the number of the middle water jacket upper water passage 21 is one. The number of the middle water jacket to upper water jacket passage in space is two.

[0086] Figure 6 The component exploded view of the upper water jacket provided by one or more embodiments of the present application is shown. Referring to Figure 6 The upper water jacket comprises: an upper water jacket upper water passage 31, an upper water jacket water outlet 32.

[0087] Due to the overall flow path design of the cylinder head, the upper water jacket upper water passage 31 is a passage that is in communication with the exhaust manifold water jacket and the middle water jacket. It should be noted that the upper water jacket 3 does not have the ability to independently receive the original water inlet of the cylinder head, and it can only receive the water that has flowed through the exhaust manifold water jacket and the middle water jacket. That is, the upper water jacket upper water passage is an upper water passage that is in communication with the lower water passages of the exhaust manifold water jacket and the middle water jacket.

[0088] Due to the flow path design, the upper water jacket is located at the end position of the upper water jacket, and the water outlet of the upper water jacket, that is, the upper water jacket water outlet 32, undertakes the task of total drainage of the water flow flowing through all the upper water jackets. That is, all the water flow flowing through the upper water jacket needs to pass through the upper water jacket water outlet 32 and be discharged to the outside of the cylinder head.

[0089] In terms of spatial position layout, the upper water jacket upper water passage 31 is located at the top end of the upper water jacket, and the upper water jacket water outlet 32 is located at the bottom end of the upper water jacket.

[0090] In terms of quantity, the number of the upper water jacket upper water passage 31 is two. The number of the upper water jacket water outlet 32 is one.

[0091] Figure 7 is the flow chart of the control method of the engine cooling system provided by one or more embodiments of the present application. Referring to Figure 7The control method of the engine cooling system comprises the following operation steps:

[0092] S71, in the low-temperature starting condition, by monitoring the intake temperature and the actual water temperature signal, the minimum flow opening signal of the electromagnetic valve is given under the preset strategy.

[0093] S72, in the normal working condition, by monitoring the intake temperature and the actual water temperature signal, the maximum flow opening signal of the electromagnetic valve is given under the preset strategy.

[0094] The control method given in the embodiment is usually executed by the engine or the ECU equipped on the vehicle.

[0095] The ECU needs to obtain the temperature signal of the corresponding point from the temperature sensor connected thereto. In the embodiment, there are two temperature sensors directly connected to the ECU, one is an intake temperature sensor, and the other is a water temperature sensor.

[0096] After receiving the temperature sensing signals collected by the two temperature sensors, the ECU can comprehensively judge the current working condition of the engine through the received temperature sensing signals.

[0097] In the embodiment, there are two typical engine working conditions, one is the low-temperature starting condition, and the other is the normal working condition.

[0098] In the low-temperature starting condition, the engine is in the process of starting, and each component of the engine is gradually converted from the original stop state to the working state.

[0099] In the low-temperature starting condition, the temperature of each component of the engine is generally not high enough because it has not been completely converted to the normal working state. That is, compared with a normally working engine, each component of the engine in the low-temperature starting condition is generally in a relatively low-temperature state.

[0100] In such a state of insufficient temperature, if the water flow is completely opened, more heat will be lost, which is not conducive to the engine quickly entering the normal working state. In severe cases, it may cause the engine to fail to start, and the vehicle needs to be restarted.

[0101] Therefore, in the low-temperature starting condition, the control strategy adopted in the embodiment is to adjust the flow opening signal to the minimum. That is, the liquid flow in the cooling system is the minimum, and the heat loss is maximized to the extent that the heat generated by the components is retained in the engine as much as possible.

[0102] And in the normal working condition, most of the components in the engine have been out of the shutdown state, which means that the heat level generated by each component of the engine is maintained at a high level.

[0103] At this time, the control strategy to be adopted is to give the maximum flow opening signal. Let the water flow through each component in the cylinder head with the maximum amount, and try to take away as much excess heat generated by the engine from each component in the cylinder head.

[0104] Since the flow opening signal determines the actual opening of the electromagnetic valve during control, giving the maximum flow opening signal means that the electromagnetic valve will maintain the maximum opening during control. And giving the minimum flow opening signal means that the electromagnetic valve will maintain the minimum opening during control.

[0105] In addition to the maximum opening and the minimum opening described above, in actual engineering application, there is also a control scenario in which the actual control opening is neither the maximum nor the minimum, but in an intermediate state.

[0106] This situation needs to be decided according to the current control scenario and control needs.

[0107] Figure 8 is the control principle diagram of the control method of the engine cooling system provided by one or more embodiments of the present application. Referring to Figure 8 When low-temperature cold starting, that is, the intake air temperature < 10℃ and the water temperature < 50℃, the ECU gives an output signal of 0, and the electromagnetic valve opening is the minimum 10%. At this time, the water flow in the cylinder head intake side water jacket is small, and the heat exchange capacity is low, so that the local temperature of the cylinder head rises rapidly, ensuring smooth low-temperature starting and stable combustion, and improving emissions; when the normal working condition is restored, that is, the intake air temperature ≥ 10℃ or the water temperature ≥ 50℃, the ECU gives an output signal of 1, and the electromagnetic valve opening is the maximum 100%. At this time, the water flow in the cylinder head intake side water jacket returns to normal, the heat exchange capacity is restored, and the cylinder head temperature is stable within the design range, ensuring the reliability of the cylinder head.

[0108] Of course, the above is only an example, and the specific needs of the pre-performance calibration, confirmation and locking of the above parameters, including the determination conditions of the intake air temperature, the determination conditions of the water temperature, the output signal, the electromagnetic valve development, that is, the water jacket flow distribution under different electromagnetic valve openings, etc. The present application only increases the electromagnetic valve in the intake side water jacket, and other positions can also be increased according to the specific situation, and the logic and principle are the same.

[0109] The engine cooling system provided by the embodiment of the present application and the corresponding control method can not only effectively improve the thermal efficiency of the engine, but also improve the emissions of the engine, and has good benefits.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An engine cooling system, characterized in that, The engine cooling system includes: Upper water jacket, middle water jacket and lower water jacket; The water jacket includes: intake water jacket, exhaust water jacket and exhaust manifold water jacket; The cylinder head water jacket inlet is connected to the intake water jacket, exhaust water jacket, exhaust manifold water jacket and intermediate water jacket respectively; The exhaust manifold water jacket and the middle water jacket are respectively connected to the upper water jacket; The intake water jacket and exhaust water jacket are connected to the cylinder head water jacket outlet through the lower main water jacket; The upper water jacket is also connected to the outlet of the cylinder head water jacket; A solenoid valve is also installed at the water inlet of the lower water jacket; Solenoid valves control the water flow by adjusting the valve opening.

2. The system according to claim 1, characterized in that, The intake water jacket includes: a water supply channel for the first intake cylinder, a water supply channel for the second intake cylinder, a water supply channel for the third intake cylinder, and a water supply channel for the fourth intake cylinder.

3. The system according to claim 1, characterized in that, The exhaust water jacket includes: the water inlet channel for the first exhaust cylinder, the water inlet channel for the second exhaust cylinder, the water inlet channel for the third exhaust cylinder, and the water inlet channel for the fourth exhaust cylinder.

4. The system according to claim 1, characterized in that, The exhaust manifold water jacket includes: a first exhaust manifold cylinder water inlet channel, a second exhaust manifold cylinder water inlet channel, a third exhaust manifold cylinder water inlet channel, and a fourth exhaust manifold cylinder water inlet channel.

5. The system according to claim 4, characterized in that, The exhaust manifold water jacket also includes: the channel from the exhaust manifold water jacket to the upper water jacket.

6. The system according to claim 1, characterized in that, The lower water jacket also includes: the water inlet channel at the front end of the lower water jacket and the water outlet of the lower water jacket.

7. The system according to claim 1, characterized in that, The middle water jacket includes: the water supply channel of the middle water jacket and the channel from the middle water jacket to the upper water jacket.

8. The system according to claim 1, characterized in that, The upper water jacket includes: the water supply channel of the upper water jacket and the water outlet of the upper water jacket.

9. The system according to claim 1, characterized in that, Also includes: Water temperature sensor, intake air temperature sensor and ECU.

10. A control method for an engine cooling system, applied to the engine cooling system according to any one of claims 1 to 9, characterized in that, The control method includes: During low-temperature startup, by monitoring the intake air temperature and actual water temperature signals, and under a preset strategy, the minimum flow opening signal is given to the solenoid valve; and Under normal operating conditions, by monitoring the intake air temperature and actual water temperature, the maximum flow opening signal is given to the solenoid valve under a preset strategy.

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