Control method and device of thermal management system, medium and vehicle

Abstract

The invention relates to a control method and device of a thermal management system, a medium and a vehicle. The control method of the heat management system comprises the steps that when a target heat exchange object has a heat exchange demand, current heat exchange demand parameters are determined, and the heat exchange demand parameters are used for reflecting a control strategy for a controlled object; if the heat exchange demand parameter meets a closed-loop control condition, a controlled object is controlled to adjust a target parameter based on a difference value between the target parameter and an expected parameter, so that the difference value between the target parameter and the expected parameter meets an expected error; wherein the target parameter is used for reflecting whether the target heat exchange object reaches the required temperature or not. According to the technical scheme, calibration work can be reduced, and calibration cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle thermal management, and in particular to a control method, device, medium and vehicle of a thermal management system. Background Art

[0002] In recent years, with the gradual popularization of new energy vehicles, the performance of new energy vehicles has also been significantly improved. The thermal management system of new energy vehicles is a system that manages the heat of new energy vehicles. The operation of the thermal management system also has a great impact on the range of new energy vehicles. In order to make the range of new energy vehicles longer and longer, the requirements for the thermal management system of new energy vehicles are also getting higher and higher.

[0003] At present, the cooling and heating requirements of the engine, battery and cabin can be met by controlling the speed of the water pump, the opening of the electronic valve, the speed of the fan and the opening of the air intake grille, thereby achieving thermal management of new energy vehicles. However, the related technology generally obtains the controlled object based on the measured temperature table, and performs open-loop control on the controlled object, which requires a lot of calibration work, and the reuse rate of calibration parameters for different projects is low. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a control method, device, medium and vehicle of a thermal management system to reduce calibration work and reduce calibration costs.

[0005] The present disclosure provides a control method for a thermal management system, comprising:

[0006] When the target heat exchange object has a heat exchange demand, determining a current heat exchange demand parameter, wherein the heat exchange demand parameter is used to reflect a control strategy for the controlled object;

[0007] If the heat exchange demand parameter meets the closed-loop control condition, the opening of the controlled object is controlled to adjust the target parameter based on the difference between the target parameter and the expected parameter so that the difference between the target parameter and the expected parameter meets the expected error; wherein the target parameter is used to reflect whether the target heat exchange object has reached the required temperature.

[0008] In the present disclosure, the controlling the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter includes:

[0009] Based on the difference between the target parameter and the expected parameter, determining a proportional value proportional to the difference and an integral value proportional to the integral of the difference within an integral time;

[0010] The controlled object is controlled based on the sum of the proportional value and the integral value.

[0011] In the present disclosure, the method further comprises:

[0012] In the case where the controlled object is the opening of the integrated valve, if the heat exchange demand parameter is the first heat exchange demand parameter or the second heat exchange demand parameter, determining that the heat exchange demand parameter satisfies the closed-loop control condition;

[0013] Wherein, the first heat exchange requirement parameter includes:

[0014] The target heat exchange object is an engine;

[0015] The difference between the engine water outlet temperature and the expected water outlet temperature is greater than the temperature threshold;

[0016] The radiator full-opening request is not received when only the engine has a heat exchange demand, or the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled, or the engine inlet and outlet temperature difference control mode is enabled;

[0017] The second heat exchange requirement parameter includes:

[0018] The target heat exchange object includes at least one of a battery and a cabin and an engine;

[0019] The engine is in a hot state;

[0020] No integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine have heat exchange requirements at the same time, or the engine inlet and outlet temperature difference control mode is enabled;

[0021] Among them, the engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and outlet reach a first desired temperature difference, and the exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a second desired temperature difference.

[0022] In the present disclosure, the method further comprises:

[0023] If the heat exchange demand parameters do not meet the closed-loop control conditions, and the heat exchange demand parameters include:

[0024] The target heat exchange object is an engine;

[0025] The difference between the engine water outlet temperature and the expected water outlet temperature is greater than the temperature threshold;

[0026] A radiator full-open request is received when only the engine has a heat exchange demand;

[0027] The exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled;

[0028] The engine inlet and outlet temperature difference control mode is not enabled;

[0029] The opening degree of the integrated valve is controlled to be a first target opening degree so that the coolant passage of the radiator is fully opened and the warm air circuit is fully closed.

[0030] In the present disclosure, the method further comprises:

[0031] In the case where the controlled object is the speed of a water pump, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirement:

[0032] An engine inlet and outlet temperature difference control mode, wherein the engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and the water outlet reach a first desired temperature difference;

[0033] an exhaust gas recirculation inlet and outlet temperature difference control mode, wherein the exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a second desired temperature difference;

[0034] An engine outlet water temperature enhanced heat dissipation mode, wherein the engine outlet water temperature enhanced heat dissipation mode is used to make the engine outlet temperature reach a desired outlet temperature at a first temperature change rate;

[0035] A first normal mode is used to make the water outlet temperature of the engine reach a desired water outlet temperature at a second temperature change rate, wherein the second temperature change rate is smaller than the first temperature change rate.

[0036] In the present disclosure, in the engine outlet water temperature enhanced heat dissipation mode, the expected parameter includes the sum of the expected water outlet temperature and a first calibrated temperature, and the first calibrated temperature is used to reduce the final speed of the water pump when the water pump and the integrated valve jointly control the engine outlet temperature.

[0037] In the present disclosure, the method further comprises:

[0038] In the case where the controlled object is the speed of a cooling fan, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirement:

[0039] an engine inlet water temperature enhanced heat dissipation mode, wherein the engine inlet water temperature enhanced heat dissipation mode is used to make the engine water inlet temperature reach a desired water inlet temperature at a third temperature change rate;

[0040] The second normal mode is used to make the engine water inlet temperature reach the desired water inlet temperature at a fourth temperature change rate, and the fourth temperature change rate is smaller than the third temperature change rate.

[0041] In the present disclosure, in the engine inlet water temperature enhanced heat dissipation mode, the expected parameter includes the sum of the expected water inlet temperature and a second calibrated temperature, and the second calibrated temperature is used to reduce the final speed of the cooling fan when the cooling fan and the air intake grille jointly control the engine water inlet temperature.

[0042] In the present disclosure, the method further comprises:

[0043] If the engine is in a hot state, and when the speed of the cooling fan is at the minimum speed, when the opening of the air intake grille reaches the second target opening, and the engine water inlet temperature is lower than the expected water inlet temperature, the cooling fan is controlled to maintain the minimum speed.

[0044] The present disclosure provides a control device for a thermal management system, comprising:

[0045] A heat exchange demand parameter determination module, used to determine the current heat exchange demand parameter when the target heat exchange object has a heat exchange demand, wherein the heat exchange demand parameter is used to reflect the control strategy for the controlled object;

[0046] A control module is used to control the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter if the heat exchange demand parameter meets the closed-loop control condition, so that the difference between the target parameter and the expected parameter meets the expected error; wherein the target parameter is used to reflect whether the target heat exchange object has reached the required temperature.

[0047] The present disclosure also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a program or instruction, wherein the program or instruction enables a computer to execute the steps of any of the above methods.

[0048] The present disclosure also provides a vehicle, comprising:

[0049] one or more processors;

[0050] A memory for storing one or more programs or instructions;

[0051] The processor is used to execute the steps of any of the above methods by calling the program or instruction stored in the memory.

[0052] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0053] The technical solution provided by the embodiment of the present disclosure can control the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter when the heat exchange demand parameter meets the closed-loop control condition, so that the difference between the target parameter and the expected parameter meets the expected error. In this way, the controlled object can be controlled by continuously feeding back the target parameter in some scenarios to achieve closed-loop control, thereby ensuring that the difference between the target parameter and the expected parameter meets the expected error, so that the target heat exchange object reaches the required temperature and meets the heat exchange demand of the target heat exchange object. Moreover, the controlled object is controlled only by the actual feedback target parameter, and there is no need to pre-calibrate the controlled object. Therefore, open-loop control is avoided in any scenario, thereby reducing calibration work and reducing calibration costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0056] Figure 1 A flow chart of a control method of a thermal management system provided by an embodiment of the present disclosure;

[0057] Figure 2 A structural block diagram of a control device for a thermal management system provided by an embodiment of the present disclosure;

[0058] Figure 3 A schematic diagram of the structure of a vehicle provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0060] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0061] Figure 1The following is a flow chart of a control method of a thermal management system provided by an embodiment of the present disclosure. The method can be applied to hybrid vehicles, etc. The method can be executed by a control device of the thermal management system, and the control device of the thermal management system can be implemented in software and / or hardware. Figure 1 As shown, the method comprises the following steps:

[0062] S110. When the target heat exchange object has a heat exchange demand, determine a current heat exchange demand parameter.

[0063] Among them, the target heat exchange object is the engine, or the target heat exchange object includes at least one of the battery and the cabin and the engine. The heat exchange demand parameter is used to reflect the control strategy of the integrated valve. When the target heat exchange object is the engine, it indicates that only the engine has a heat exchange demand; when the target heat exchange object includes at least one of the battery and the cabin, it indicates that at least one of the battery and the cabin has a heat exchange demand; when the target heat exchange object includes at least one of the battery and the cabin and the engine, it indicates that at least one of the battery and the cabin and the engine have a heat exchange demand at the same time. The embodiment of the present disclosure sets a closed-loop control method for the above-mentioned heat exchange working conditions.

[0064] Specifically, the running state of the engine and the temperature of the engine are obtained, and whether the engine is working (running) can be determined according to the running state of the engine. For example, when the running state of the engine is 0x2:CRANK||0x3:RUN||0x4:STALL, it can be determined that the engine is working, and the working performance of the engine is affected by the temperature of the engine. Therefore, it can be judged whether the engine has a heat exchange (cooling) demand based on the running state of the engine and the temperature of the engine. Exemplarily, when it is determined that the engine is working based on the running state of the engine, and the temperature of the engine exceeds the optimal working temperature range, it is determined that the engine has a heat exchange demand. The heat exchange demand includes heating demand and cooling demand. Specifically, the heat exchange object can be heated by a heating device (such as a heater) to meet the heating demand of the heating object, and the heat exchange object can be cooled by a cooling device (such as a liquid cooling plate) to meet the cooling demand of the heat exchange object. Usually, the engine warms up quickly after starting, and the normal working temperature of the engine can be reached quickly. However, during the operation of the engine, the engine will generate a high amount of heat, causing the temperature of the engine to continue to rise. Once the temperature of the engine exceeds the optimal working temperature range, the working performance of the engine will be affected. Therefore, the disclosed embodiments are mainly aimed at the scenario where there is a cooling demand for the engine, so as to ensure the working performance of the engine by cooling the engine. In addition, when the air conditioning heating mode request is engine waste heat heating and water side heater heating is prohibited or water side heater heating and engine waste heat heating is allowed, or a water pump request is received when the passenger compartment is mixed with air, or the air conditioning heating mode request is water side heater heating and engine waste heat heating is allowed, and it changes to non-water side heater heating and engine waste heat heating is allowed and the water side heater is working, there is a heat exchange (heating) demand in the driving cabin, otherwise there is no heat exchange (heating) demand in the driving cabin. When the battery heating mode request is engine waste heat heating and water side heater heating is prohibited or water side heater heating and engine waste heat heating is prohibited, or the battery heating mode request is water side heater heating and engine waste heat heating is prohibited, and it changes to water side heater heating and engine waste heat heating is prohibited and the water side heater is working, there is a heat exchange (heating) demand for the battery, otherwise there is no heat exchange (heating) demand for the battery.

[0065] In the embodiment of the present disclosure, a control strategy suitable for open-loop control or closed-loop control is set for different heat exchange scenarios, and the corresponding control strategy is triggered by determining the current heat exchange demand parameter. Among them, open-loop control is a control system that applies mathematics, physics and control theory to realize the design and control of equipment, mechanical equipment and general processes, requiring the controlled object to change according to the parameters preset by the system. And closed-loop control is a method that can detect the state of the controlled object, feed back the signal to the control system, and then adjust the control variable through the control device to prompt the system to achieve the desired goal or the control object to meet the expected constraints. Specific application In the embodiment of the present disclosure, the open-loop control of the controlled object (such as the opening of the integrated valve, the speed of the water pump and the speed of the cooling fan, etc.) can be realized according to the relationship table between the controlled object and its related parameters; in addition, the proportional value and the integral value can be obtained according to the difference between the target parameter and the expected parameter, and the closed-loop control of the controlled object is realized based on the sum of the proportional value and the integral value. In this embodiment, the heat exchange demand parameter can be determined according to the relevant control data of the thermal management system (see below for details).

[0066] S120. If the heat exchange demand parameter satisfies the closed-loop control condition, based on the difference between the target parameter and the expected parameter, the controlled object is controlled to adjust the target parameter so that the difference between the target parameter and the expected parameter satisfies the expected error.

[0067] Among them, the target parameter is used to reflect whether the target heat exchange object reaches the required temperature.

[0068] In some embodiments, based on the difference between the target parameter and the expected parameter, the controlled object is controlled to adjust the target parameter, including: based on the difference between the target parameter and the expected parameter, determining a proportional value that is proportional to the difference, and an integral value that is proportional to the integral of the difference within an integral time; and controlling the controlled object based on the sum of the proportional value and the integral value.

[0069] In some embodiments, when the controlled object is the opening of the integrated valve, if the heat exchange demand parameter is the first heat exchange demand parameter or the second heat exchange demand parameter, it is determined that the heat exchange demand parameter satisfies the closed-loop control condition;

[0070] The first heat exchange demand parameter includes: the target heat exchange object is the engine; the difference between the engine outlet temperature and the expected outlet temperature is greater than the temperature threshold; the radiator full opening request under the condition that only the engine has a heat exchange demand is not received, or the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled, or the engine inlet and outlet temperature difference control mode is enabled;

[0071] The second heat exchange demand parameter includes: the target heat exchange objects include at least one of the battery and the cabin and the engine; and the engine is in a hot engine state; and no integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine have heat exchange demands at the same time, or the engine inlet and outlet temperature difference control mode is enabled.

[0072] In the disclosed embodiment, the integrated valve is an integrated valve of the engine and the heater circuit, and may be a six-way valve.

[0073] In the disclosed embodiment, the radiator full opening request is used to request the coolant passage of the radiator to be fully opened; the exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a first desired temperature difference; the engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and outlet reach a second desired temperature difference. The exhaust gas recirculation inlet and outlet temperature difference control mode being enabled means that the exhaust gas recirculation inlet and outlet temperature difference control mode is triggered, and the engine inlet and outlet temperature difference control mode being enabled means that the engine inlet and outlet temperature difference control mode is triggered.

[0074] In the above example, if the engine is working, and the engine temperature is greater than the engine target temperature, and the difference between the engine water outlet temperature and the engine water inlet temperature is greater than or equal to the temperature stability threshold, the engine inlet and outlet temperature difference control mode is enabled, wherein the temperature stability threshold is the critical value between stable combustion and unstable combustion of the engine, and when the difference between the engine water outlet temperature and the engine water inlet temperature is less than the temperature stability threshold, the engine is stably burning; if the engine water outlet temperature is greater than the expected water outlet temperature and the engine water outlet temperature change rate is greater than the temperature change rate threshold, or the engine water outlet temperature change rate is greater than 0 and the difference between the engine water outlet temperature and the expected water outlet temperature is greater than the high temperature threshold, then the engine inlet and outlet temperature difference control mode is not enabled, wherein the temperature change rate threshold is used to characterize that the temperature rises too fast, and the high temperature threshold is used to characterize that the temperature is too high. If both of the above conditions are met, the engine inlet and outlet temperature difference control mode is not enabled, that is, the priority of the engine inlet and outlet temperature difference control mode not being enabled is higher than the priority of the engine inlet and outlet temperature difference control mode being enabled. If the exhaust gas recirculation valve is fully open and the exhaust gas recirculation valve outlet temperature is greater than the expected outlet temperature, the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled; if the water pump speed obtained by the closed-loop control of the water pump based on the difference between the exhaust gas recirculation valve outlet temperature and the expected outlet temperature is less than the water pump speed obtained by the closed-loop control of the water pump based on the difference between the engine outlet temperature and the expected outlet temperature, the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled.

[0075] In some embodiments, when the controlled object is the opening of the integrated valve, based on the difference between the target parameter and the expected parameter, controlling the controlled object to adjust the target parameter includes:

[0076] In response to the heat exchange demand parameter being the first heat exchange demand parameter, based on the first difference between the engine outlet temperature and the expected outlet temperature, a first proportional value proportional to the first difference and a first integral value proportional to the integral of the first difference within the integral time are determined; based on the sum of the first proportional value and the first integral value, the opening of the integrated valve is controlled. In this embodiment, only the engine has a heat exchange demand, so the heat exchange demand of the engine can be met by making the difference between the engine outlet temperature and the expected outlet temperature meet the expected error. In addition, the first difference is multiplied by the proportional coefficient to obtain the first proportional value to reduce the first difference. The first difference is continuously accumulated within the integral time, and the accumulated value is multiplied by the integral coefficient to obtain the first integral value to reduce the steady-state error to 0. In this way, proportional integral control of the opening of the integrated valve is implemented based on the above-mentioned first difference, so that the difference between the engine outlet temperature and the expected outlet temperature meets the expected error.

[0077] In some embodiments, when the controlled object is the opening of the integrated valve, based on the difference between the target parameter and the expected parameter, controlling the controlled object to adjust the target parameter includes:

[0078] In response to the heat exchange demand parameter being the second heat exchange demand parameter, based on the second difference between the engine outlet temperature and the expected outlet temperature, a second proportional value proportional to the second difference and a second integral value proportional to the integral of the second difference within the integral time are determined; based on the sum of the second proportional value and the second integral value, the opening of the integrated valve is controlled so that the coolant flow through the radiator changes with the opening of the integrated valve, and the warm air circuit is fully open. Among them, the opening of the integrated valve is in the adjustable range of the coolant flow of the radiator, for example, when the integrated valve is a six-way valve, the adjustable range is 65° to 135°. In this way, by controlling the opening of the integrated valve to make the warm air circuit fully open, the heat exchange demand of at least one of the battery and the cabin can be met. At the same time, by controlling the opening of the integrated valve, the coolant flow through the radiator can be adjusted, thereby adjusting the difference between the engine outlet temperature and the expected outlet temperature, so that the difference between the engine outlet temperature and the expected outlet temperature meets the expected error and meets the heat exchange demand of the engine. In this embodiment, the second difference is multiplied by the proportional coefficient to obtain a second proportional value to reduce the second difference. The second difference is continuously accumulated during the integration time, and the accumulated value is multiplied by the integral coefficient to obtain a second integral value to reduce the steady-state error to 0. In this way, proportional integral control of the opening of the integrated valve is implemented based on the second difference, so that the difference between the engine outlet temperature and the expected outlet temperature meets the expected error.

[0079] In the above embodiments, the proportional coefficient and the integral coefficient can be obtained by calculating a PID (Proportion Integration Differentiation) controller, or by a parameter self-tuning method, and the present disclosure does not limit this.

[0080] In some embodiments, when the controlled object is the speed of a water pump, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirement:

[0081] The engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and outlet reach a first desired temperature difference;

[0082] The exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a second desired temperature difference;

[0083] The engine outlet water temperature enhanced heat dissipation mode is used to make the engine outlet temperature reach the desired outlet temperature at a first temperature change rate;

[0084] The first normal mode is used to make the water outlet temperature of the engine reach the desired water outlet temperature at a second temperature change rate, and the second temperature change rate is smaller than the first temperature change rate.

[0085] Specifically, for the case where only the engine has a heat exchange demand: if the engine inlet and outlet temperature difference control mode is enabled, the control mode is the engine inlet and outlet temperature difference control mode; if the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled, and the engine inlet and outlet temperature difference control mode is not enabled, the control mode is the exhaust gas recirculation inlet and outlet temperature difference control mode; if the engine outlet water temperature enhanced heat dissipation mode is enabled, and the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled, and the engine inlet and outlet temperature difference control mode is not enabled, then the control mode is the engine outlet water temperature enhanced heat dissipation mode; if an open-loop control request for an integrated valve (an integrated valve of the engine and the heater circuit, such as a six-way valve) is received when only the engine has a heat exchange demand, and the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled, and the engine inlet and outlet temperature difference control mode is not enabled, then the control mode is the first normal mode.

[0086] For at least one of the battery and the cabin and the engine having a simultaneous heat exchange demand: if the engine inlet and outlet temperature difference control mode is enabled, and the engine outlet water temperature enhanced heat dissipation mode is not enabled, and no integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine has a simultaneous heat exchange demand, then the control mode is the engine inlet and outlet temperature difference control mode; if the engine outlet water temperature enhanced heat dissipation mode is enabled, and the engine inlet and outlet temperature difference control mode is not enabled, and no integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine has a simultaneous heat exchange demand, then the control mode is the engine outlet water temperature enhanced heat dissipation mode; if an integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine has a simultaneous heat exchange demand, and the engine inlet and outlet temperature difference control mode is not enabled, and the engine outlet water temperature enhanced heat dissipation mode is not enabled, then the control mode is the first normal mode.

[0087] In the above example, if the engine is working, and the engine temperature is greater than the engine target temperature, and the difference between the engine water outlet temperature and the engine water inlet temperature is greater than or equal to the temperature stability threshold, the engine inlet and outlet temperature difference control mode is enabled, wherein the temperature stability threshold is the critical value between stable combustion and unstable combustion of the engine, and when the difference between the engine water outlet temperature and the engine water inlet temperature is less than the temperature stability threshold, the engine is stably burning; if the engine water outlet temperature is greater than the expected water outlet temperature and the engine water outlet temperature change rate is greater than the temperature change rate threshold, or the engine water outlet temperature change rate is greater than 0 and the difference between the engine water outlet temperature and the expected water outlet temperature is greater than the high temperature threshold, then the engine inlet and outlet temperature difference control mode is not enabled, wherein the temperature change rate threshold is used to characterize that the temperature rises too fast, and the high temperature threshold is used to characterize that the temperature is too high. If both of the above conditions are met, the engine inlet and outlet temperature difference control mode is not enabled, that is, the priority of the engine inlet and outlet temperature difference control mode not being enabled is higher than the priority of the engine inlet and outlet temperature difference control mode being enabled. If the engine water outlet temperature is greater than the expected water outlet temperature and the engine water outlet temperature change rate is greater than the temperature change rate threshold, or the engine water outlet temperature change rate is greater than 0 and the difference between the engine water outlet temperature and the expected water outlet temperature is greater than the high temperature threshold, then the engine outlet water temperature enhanced heat dissipation mode is enabled; if the engine inlet and outlet temperature difference control mode is enabled, or an integrated valve open-loop control request is received when only the engine has a heat exchange demand, or an integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine have a heat exchange demand at the same time, then the engine outlet water temperature enhanced heat dissipation mode is not enabled. If the exhaust gas recirculation valve is fully open and the exhaust gas recirculation valve outlet temperature is greater than the expected outlet temperature, then the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled; if the water pump speed obtained by the closed-loop control water pump based on the difference between the exhaust gas recirculation valve outlet temperature and the expected outlet temperature is less than the water pump speed obtained by the closed-loop control water pump based on the difference between the engine outlet temperature and the expected outlet temperature, then the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled.

[0088] Based on the above embodiments, correspondingly, in some embodiments, when the controlled object is the speed of the water pump, based on the difference between the target parameter and the expected parameter, the controlled object is controlled to adjust the target parameter, including: in response to the engine inlet and outlet temperature difference control mode, obtaining the third difference between the difference between the engine water inlet temperature and the water outlet temperature and the first expected temperature difference; determining a third proportional value proportional to the third difference; determining a third integral value proportional to the integral of the third difference within the integral time; based on the sum of the third proportional value and the third integral value, the speed of the water pump is controlled. In this embodiment, the third difference is multiplied by the proportional coefficient to obtain the third proportional value to reduce the third difference. The third difference is continuously accumulated within the integral time to obtain the third integral value to reduce the steady-state error to 0. In this way, proportional-integral control of the water pump speed is implemented based on the above third difference, so that the third difference meets the expected error.

[0089] In some embodiments, when the controlled object is the speed of a water pump, based on the difference between the target parameter and the expected parameter, the controlled object is controlled to adjust the target parameter, including: in response to the exhaust gas recirculation inlet and outlet temperature difference control mode, obtaining the fourth difference between the difference between the exhaust gas recirculation inlet temperature and the outlet temperature and the second expected temperature difference; determining a fourth proportional value proportional to the fourth difference; determining a fourth integral value proportional to the integral of the fourth difference within the integral time; and controlling the speed of the water pump based on the sum of the fourth proportional value and the fourth integral value. In this embodiment, the fourth difference is multiplied by the proportional coefficient to obtain the fourth proportional value to reduce the fourth difference. The fourth difference is continuously accumulated within the integral time to obtain the fourth integral value to reduce the steady-state error to 0. In this way, proportional-integral control of the water pump speed is implemented based on the above-mentioned fourth difference, so that the fourth difference meets the expected error.

[0090] In some embodiments, when the controlled object is the speed of a water pump, based on the difference between the target parameter and the expected parameter, the controlled object is controlled to adjust the target parameter, including: in response to the engine outlet water temperature enhanced heat dissipation mode, obtaining the fifth difference between the difference between the engine outlet temperature and the expected outlet temperature and the first calibration temperature, determining a fifth proportional value proportional to the fifth difference; determining a fifth integral value proportional to the integral of the fifth difference within the integral time; based on the sum of the fifth proportional value and the fifth integral value, the speed of the water pump is controlled, and the first calibration temperature is used to reduce the final speed of the water pump when the water pump and the integrated valve jointly control the engine outlet temperature. In this embodiment, the fifth difference is multiplied by the proportional coefficient to obtain the fifth proportional value to reduce the fifth difference. The fifth difference is continuously accumulated within the integral time to obtain the fifth integral value to reduce the steady-state error to 0. In this way, proportional-integral control of the water pump speed is achieved based on the above-mentioned fifth difference, so that the fifth difference meets the expected error.

[0091] For example, when the engine outlet water temperature enhanced heat dissipation mode is triggered, the water pump and the integrated valve jointly control the engine outlet temperature, wherein for the water pump, the difference between the engine outlet temperature and the desired outlet temperature and the calibration temperature (such as 1°C) is used as the input of the proportional integral control, and for the integrated valve, the difference between the engine outlet temperature and the desired outlet temperature is used as the input of the proportional integral control. In this way, when the engine outlet temperature reaches the desired outlet temperature, the final speed of the water pump can be ensured to be relatively low, thereby achieving the effect of energy saving.

[0092] In some embodiments, when the controlled object is the speed of a water pump, based on the difference between the target parameter and the expected parameter, the controlled object is controlled to adjust the target parameter, including: in response to the first normal mode, obtaining the sixth difference between the engine outlet temperature and the expected outlet temperature; determining the sixth proportional value proportional to the sixth difference; determining the sixth integral value proportional to the integral of the sixth difference within the integral time; and controlling the speed of the water pump based on the sum of the sixth proportional value and the sixth integral value. In this embodiment, the sixth difference is multiplied by the proportional coefficient to obtain the sixth proportional value to reduce the sixth difference. The sixth difference is continuously accumulated within the integral time to obtain the sixth integral value to reduce the steady-state error to 0; the specific number of repetitions can be set. In this way, proportional-integral control of the water pump speed is implemented based on the above-mentioned sixth difference, so that the sixth difference meets the expected error.

[0093] When the controlled object is the speed of the cooling fan, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirements:

[0094] The engine inlet water temperature enhanced heat dissipation mode is used to make the engine water inlet temperature reach the desired water inlet temperature at a third temperature change rate;

[0095] The second normal mode is used to make the engine water inlet temperature reach the desired water inlet temperature at a fourth temperature change rate, and the fourth temperature change rate is less than the third temperature change rate.

[0096] In this embodiment, in order to achieve the engine water inlet temperature reaching the desired water inlet temperature at the third temperature change rate, the speed of the cooling fan and the opening of the air intake grille can be simultaneously closed-loop controlled; and in order to achieve the engine water inlet temperature reaching the desired water inlet temperature at the fourth temperature change rate, the opening of the air intake grille can be open-loop controlled first, and then the speed of the cooling fan can be closed-loop controlled.

[0097] Specifically, if the rate of change of the engine water inlet temperature is too fast (such as greater than the temperature change rate threshold, which can be calibrated according to the actual experimental temperature), or the engine water inlet temperature is too high compared to the expected water inlet temperature (such as greater than the high temperature threshold, which can be calibrated according to the actual experimental temperature), it is urgent to quickly cool the engine water inlet temperature. At this time, the control mode should be the engine inlet water temperature enhanced heat dissipation mode. In this way, the speed of the cooling fan and the opening of the air intake grille are closed-loop controlled at the same time, so that the engine water inlet temperature drops rapidly and reaches the expected water inlet temperature. In addition to the above situation, when the cooling fan and the air intake grille need to be jointly controlled, and the opening of the air intake grille needs to be open-loop controlled, the control mode can be the second normal mode. At this time, the opening of the air intake grille is first open-loop controlled. If the engine water inlet temperature is still greater than the expected water inlet temperature when the opening of the air intake grille reaches the target opening (such as fully open), the speed of the cooling fan is closed-loop controlled. In this way, part of the temperature of the engine water inlet is first taken away by controlling the opening of the air intake grille, and then the speed of the cooling fan is controlled in a closed loop, so that the engine water inlet temperature can be accurately controlled to the desired water inlet temperature, and the speed of the cooling fan can be lowered, thereby saving power consumption. Accordingly, in some embodiments, determining the current control mode includes: if the engine inlet water temperature enhanced heat dissipation mode is enabled, determining that the current control mode is the engine inlet water temperature enhanced heat dissipation mode; if an air intake grille open-loop control request is received, determining that the current control mode is the second normal mode. In this way, by setting the trigger condition of the control mode, it is possible to accurately determine whether the current control mode is the engine inlet water temperature enhanced heat dissipation mode or the second normal mode according to the trigger condition, thereby achieving accurate control of the cooling fan speed.

[0098] In some embodiments, when the controlled object is the rotation speed of a cooling fan, based on the difference between the target parameter and the expected parameter, controlling the controlled object to adjust the target parameter includes:

[0099] In response to the engine inlet water temperature enhanced heat dissipation mode, based on the seventh difference between the difference between the engine water inlet temperature and the expected water inlet temperature and the second calibrated temperature, a seventh proportional value proportional to the seventh difference and a seventh integral value proportional to the integral of the seventh difference within the integral time are determined. The second calibrated temperature is used to reduce the final speed of the cooling fan when the cooling fan and the air intake grille jointly control the engine water inlet temperature; the speed of the cooling fan is controlled based on the sum of the seventh proportional value and the seventh integral value.

[0100] Exemplarily, when the engine inlet water temperature enhanced heat dissipation mode is triggered, the cooling fan and the air intake grille jointly control the engine water inlet temperature, wherein for the cooling fan, the difference between the engine water inlet temperature and the desired water inlet temperature and the calibrated temperature (positive value, such as 1°C) is used as input, and for the air intake grille, the difference between the engine water inlet temperature and the desired water inlet temperature is used as input. In this way, by setting the calibrated temperature for the control parameters of the cooling fan, the final speed of the cooling fan can be ensured to be small when the engine water inlet temperature reaches the desired water inlet temperature, thereby achieving energy saving. In this embodiment, the seventh difference is multiplied by the proportional coefficient to obtain the seventh proportional value to reduce the seventh difference. The seventh difference is continuously accumulated during the integral time, and the accumulated value is multiplied by the integral coefficient to obtain the seventh integral value to reduce the steady-state error to 0. In this way, the proportional integral control of the speed of the cooling fan is realized based on the above-mentioned first difference, so that the difference between the engine water inlet temperature and the desired water inlet temperature meets the expected error.

[0101] In some embodiments, when the controlled object is the rotation speed of a cooling fan, based on the difference between the target parameter and the expected parameter, controlling the controlled object to adjust the target parameter includes:

[0102] In response to the second normal mode, based on the eighth difference between the engine water inlet temperature and the expected water inlet temperature, an eighth proportional value proportional to the eighth difference and an eighth integral value proportional to the integral of the eighth difference within the integral time are determined. In this embodiment, the eighth difference is multiplied by the proportional coefficient to obtain the eighth proportional value to reduce the eighth difference. The eighth difference is continuously accumulated within the integral time, and the accumulated value is multiplied by the integral coefficient to obtain the eighth integral value to reduce the steady-state error to 0. In this way, proportional-integral control of the speed of the cooling fan is implemented based on the eighth difference, so that the difference between the engine water inlet temperature and the expected water inlet temperature meets the expected error.

[0103] In summary, the control method of the thermal management system provided by the embodiment of the present disclosure can control the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter when the heat exchange demand parameter meets the closed-loop control condition, so that the difference between the target parameter and the expected parameter meets the expected error. In this way, the controlled object can be controlled by continuously feeding back the target parameter in some scenarios to achieve closed-loop control, thereby ensuring that the difference between the target parameter and the expected parameter meets the expected error, so that the target heat exchange object reaches the required temperature and meets the heat exchange demand of the target heat exchange object. Moreover, the controlled object is controlled only by the actual feedback target parameter, and there is no need to pre-calibrate the controlled object. Therefore, open-loop control is avoided in any scenario, thereby reducing calibration work and reducing calibration costs.

[0104] In some embodiments, when the controlled object is the opening of the integrated valve, the method further includes:

[0105] If the heat exchange demand parameter does not meet the closed-loop control condition, and the heat exchange demand parameter includes: the target heat exchange object is the engine, and the difference between the engine outlet temperature and the expected outlet temperature is greater than the temperature threshold, and a radiator full-open request is received when only the engine has a heat exchange demand, and the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled, and the engine inlet and outlet temperature difference control mode is not enabled; then the opening of the integrated valve is controlled to be the first target opening (for example, the opening of the six-way valve is 20°) so that the coolant passage of the radiator is fully open and the warm air circuit is fully closed. In this way, when only the engine has a heat exchange demand, if the heat exchange demand parameter does not meet the closed-loop control condition, the opening of the integrated valve can be adjusted by looking up the table so that the coolant flow through the radiator is the largest, and the coolant flow of the warm air circuit is 0, thereby meeting the heat exchange demand of the engine.

[0106] In some embodiments, when the controlled object is the opening of the integrated valve, the method further includes:

[0107] If the heat exchange demand parameter does not meet the closed-loop control condition, and the heat exchange demand parameter includes: the target heat exchange object includes at least one of the battery and the cabin and the engine, and the engine is in a hot engine state, and the integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine have heat exchange demand at the same time; then the opening of the integrated valve is controlled to be the second target opening, so that the coolant flow of the warm air circuit changes with the opening of the integrated valve, and the coolant passage of the radiator is fully open. In this embodiment, the opening of the open-loop control integrated valve can be obtained by looking up the relationship table of the outlet temperature of the water side heater with respect to the opening of the integrated valve, and the coolant flow of the warm air circuit is related to the opening of the integrated valve obtained by looking up the table. In this way, when at least one of the battery and the cabin and the engine have heat exchange demand, if the heat exchange demand parameter does not meet the closed-loop control condition, the opening of the integrated valve is controlled to make the coolant passage of the radiator fully open, thereby meeting the heat exchange demand of the engine, and at the same time, the opening of the integrated valve can adjust the coolant flow of the warm air circuit to meet the heat exchange demand of at least one of the battery and the cabin.

[0108] In some embodiments, when the controlled object is the opening of the integrated valve, the method further includes:

[0109] If the heat exchange demand parameter does not meet the closed-loop control condition, and the heat exchange demand parameter includes: the target heat exchange object includes at least one of the battery and the cabin and the engine, and the engine is in a warm-up state, and the engine waste heat is available, and the engine inlet and outlet temperature difference control mode is not enabled; then the opening of the integrated valve is controlled to be the third target opening, so that the coolant flow of the warm air circuit changes with the opening of the integrated valve, and the coolant passage of the radiator is completely closed. In this embodiment, the opening of the open-loop control integrated valve can be obtained by looking up a two-dimensional table of the outlet temperature of the water side heater and the ambient temperature about the opening of the integrated valve, and the coolant flow of the warm air circuit is related to the opening of the integrated valve obtained by looking up the table. Since the engine is in a warm-up state, the engine has no heat exchange demand, so the coolant passage of the radiator is completely closed by controlling the opening of the integrated valve to ensure normal warm-up of the engine. At the same time, the opening of the integrated valve is controlled to adjust the coolant flow of the warm air circuit, so as to meet the heat exchange demand of at least one of the battery and the cabin.

[0110] In some embodiments, when the controlled object is the opening of the integrated valve, if the heat exchange demand parameter does not meet the closed-loop control condition, and the heat exchange demand parameter includes: the target heat exchange object is the engine, and the engine is in a warm-up state, then the opening of the integrated valve (six-way valve) is controlled to be 180°. In this way, the coolant passage of the radiator is closed to ensure normal warm-up of the engine.

[0111] In some embodiments, when the controlled object is the opening of the integrated valve, if the heat exchange demand parameter does not meet the closed-loop control condition, and the heat exchange demand parameter includes: the target heat exchange object includes at least one of the battery and the cabin and the engine, and the engine outlet temperature is less than the expected outlet temperature or the engine outlet temperature is lower than the outlet temperature of the water side heater, then the opening of the integrated valve is controlled to be the fourth target opening (the six-way valve opening is 285°), so that the coolant flow through the engine is 0, and the warm air circuit is fully open. Since the engine outlet temperature is less than the expected outlet temperature or the engine outlet temperature is lower than the outlet temperature of the water side heater, the engine has no cooling demand, and then the opening of the integrated valve is controlled so that the coolant flow through the engine is 0, avoiding waste of coolant cooling. At the same time, the opening of the integrated valve is controlled so that the warm air circuit is fully open, thereby meeting the heat exchange demand of at least one of the battery and the cabin.

[0112] In some embodiments, when the controlled object is the opening of the integrated valve, if at least one of the battery and the cabin has a heat exchange demand, the engine outlet temperature is greater than 65°, and the difference between the engine outlet temperature and the water side heater outlet temperature is greater than or equal to 10°, then according to the two-dimensional table of the water side heater outlet temperature and the ambient temperature on the integrated valve opening, the opening of the integrated valve is open-loop controlled to introduce part of the coolant flow through the engine into the warm air circuit. Otherwise, the opening of the integrated valve is controlled to the fifth target opening (the opening of the six-way valve is 285°), so that the coolant flow through the engine is 0, and the warm air circuit is fully open.

[0113] In some embodiments, when the controlled object is the opening of the integrated valve, if the water pump post-operation is enabled, the opening of the integrated valve is controlled to be the sixth target opening (for example, the opening of the six-way valve is 20°) so that the radiator is fully open and the warm air circuit is fully closed. Otherwise, the opening of the integrated valve is controlled to be the default opening, wherein the default opening is used to connect each branch, thereby facilitating safety in the event of a fault and facilitating offline injection.

[0114] In some embodiments, when the controlled object is the opening of the integrated valve, if the integrated valve communication fails or the integrated valve shuts down, the opening of the integrated valve is controlled to be a default opening. The default opening is used to connect each branch, thereby facilitating safety under failure and facilitating offline injection.

[0115] In some embodiments, when the controlled object is the opening of the integrated valve, when the electronic control unit is awakened, the opening of the integrated valve is controlled to be a default opening, wherein the default opening is used to connect each branch, thereby facilitating safety in the event of a fault and facilitating offline injection.

[0116] In some embodiments, when the controlled object is the rotation speed of a water pump, the method further includes:

[0117] When at least one of the battery and the cabin has a heat exchange demand, the control mode does not meet the water pump closed-loop control conditions;

[0118] The speed of the water pump is controlled to a target speed to adjust the coolant flow of the warm air circuit, wherein the target speed is the sum of the battery demand speed, the cabin demand speed and the temperature difference compensation speed between the water pump outlet and the radiator outlet.

[0119] When the battery and / or the cabin have a heat exchange demand, there is no need to cool the engine, so it is only necessary to control the speed of the water pump to adjust the coolant flow of the warm air circuit. In this embodiment, the battery demand speed can be obtained according to the relationship table between the water side heater outlet temperature and the battery demand speed, the cabin demand speed can be obtained according to the relationship table between the water side heater outlet temperature and the cabin demand speed, and the temperature difference compensation speed between the water pump outlet and the radiator outlet can be obtained according to the relationship table between the temperature difference between the water pump outlet and the radiator outlet and the compensation speed.

[0120] In some embodiments, when the controlled object is the speed of the water pump, if only the engine has a heat exchange demand, and an integrated valve open-loop control request is received when only the engine has a heat exchange demand, and the engine inlet and outlet temperature difference control mode is not enabled, and the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled, the speed of the water pump is controlled to be the sum of the minimum speed and the integrated valve position compensation speed. Among them, the integrated valve position compensation speed is used to ensure the minimum demand for the coolant flow of each branch.

[0121] In some embodiments, when the controlled object is the speed of the water pump, if only the engine has a heat exchange demand, and the engine is in a warm-up state, and the engine inlet and outlet temperature difference control mode is not enabled, and the exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled, the speed of the water pump is controlled to be the larger of the engine demand speed and the exhaust gas recirculation demand speed. In this way, the speed of the water pump can meet both the engine demand speed and the exhaust gas recirculation demand speed, ensuring the normal operation of the engine and the exhaust gas recirculation system.

[0122] In some embodiments, when the controlled object is the speed of a water pump, if at least one of the battery and the cabin and the engine have a heat exchange demand at the same time, or the engine enhanced heat dissipation mode is not enabled and the engine inlet and outlet temperature difference control mode is not enabled and an integrated valve open-loop control request is received under the situation that at least one of the battery and the cabin and the engine have a heat exchange demand at the same time, the speed of the water pump is controlled to a target speed, which is the sum of the battery demand speed, the cabin demand speed, the temperature difference compensation speed between the water pump outlet and the radiator outlet, the integrated valve opening compensation speed and the exhaust gas recirculation valve opening compensation speed.

[0123] In some embodiments, when the controlled object is the speed of the water pump, if the water pump post-operation is enabled, the speed of the water pump is controlled to be the larger of the exhaust temperature water pump post-operation speed and the engine water pump (i.e., the water pump to be controlled in the present disclosure) post-operation speed. The exhaust temperature water pump post-operation speed is obtained by looking up a two-dimensional table of the average value of the exhaust temperature 60S before the engine stops and the ambient temperature on the speed, and the engine water pump post-operation speed is obtained by looking up a two-dimensional table of the engine water outlet temperature before the engine stops and the ambient temperature on the speed. If the water pump post-operation is not enabled, the speed of the water pump is controlled to be 0.

[0124] In some embodiments, when the controlled object is the speed of a water pump, when the required speed of the water pump changes from non-0 to 0, if the water side heater is not working, the speed of the water pump is controlled to be 0, otherwise it maintains the non-0 value at the previous moment. In this way, when the speed of the water pump abnormally drops to 0, the speed of the water pump can be adjusted in time to ensure normal heat exchange of the target heat exchange object.

[0125] In some embodiments, when the controlled object is the speed of a water pump, if a water pump node is lost, or a water pump communication fails, or a water pump stops functioning, the water pump speed is controlled to 0 to protect the water pump.

[0126] In some embodiments, when the controlled object is the speed of a water pump, when the actual opening of the integrated valve (six-way valve) is in the dead zone, such as [215 235], and the exhaust gas recirculation valve opening is less than 2 (markable) and maintained for a certain time (such as 10S), the water pump speed is controlled to 0 to protect the water pump.

[0127] In some embodiments, when the controlled object is the speed of a cooling fan, the method further includes:

[0128] If the engine is in a hot state and the cooling fan speed is at the minimum speed, when the opening of the air intake grille reaches the second target opening, and the engine water inlet temperature is lower than the expected water inlet temperature, the cooling fan is controlled to maintain the minimum speed.

[0129] Specifically, the minimum speed can be the minimum operating speed of the cooling fan to provide air volume, or it can be 0. The second target opening is less than or equal to the maximum opening of the air intake grille. When the speed of the cooling fan is the minimum speed, when the opening of the air intake grille reaches the second target opening, the engine water inlet temperature is less than the expected water inlet temperature, indicating that the engine water inlet temperature can reach the expected water inlet temperature only by controlling the opening of the air intake grille. Therefore, the cooling fan can be controlled to maintain the minimum speed, thereby achieving energy saving. In one example, when the engine water inlet temperature is greater than the expected water inlet temperature, the speed of the cooling fan is controlled to the minimum speed, and the opening of the air intake grille is closed-loop controlled to the second target opening (for example, fully open). At this time, the engine water inlet temperature is less than the expected water inlet temperature, and the cooling fan is controlled to maintain the minimum speed to achieve energy saving.

[0130] In some embodiments, when the controlled object is the speed of a cooling fan, the method further includes:

[0131] If the engine is in shutdown or warm-up state, or the water pump post-operation is not enabled, the speed of the cooling fan is controlled to 0. The water pump post-operation means that the engine temperature or coolant temperature is still high after the engine is shut down, and the water pump needs to continue to run for a period of time to cool the engine temperature. Since the engine is in shutdown or warm-up state, or the water pump post-operation is not enabled, the engine does not need to be cooled, so the speed of the cooling fan can be controlled to 0 to achieve energy saving effect.

[0132] In addition, when the controlled object is the speed of the cooling fan, if the water pump post-operation is enabled, the speed of the cooling fan is open-loop controlled based on the two-dimensional table of the ambient temperature and the coolant temperature when the engine is stopped and the speed of the cooling fan. The higher the coolant temperature, the higher the initial speed of the cooling fan; the higher the ambient temperature, the higher the initial speed of the cooling fan.

[0133] Corresponding to the control method of the thermal management system provided by the embodiment of the present disclosure, the embodiment of the present disclosure also provides a control device of the thermal management system. Figure 2 A structural block diagram of a control device for a thermal management system provided in an embodiment of the present disclosure, such as Figure 2 As shown, the control device of the thermal management system includes:

[0134] A heat exchange demand parameter determination module 21 is used to determine the current heat exchange demand parameter when the target heat exchange object has a heat exchange demand, wherein the heat exchange demand parameter is used to reflect the control strategy of the controlled object;

[0135] The control module 22 is used to control the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter if the heat exchange demand parameter meets the closed-loop control condition, so that the difference between the target parameter and the expected parameter meets the expected error; wherein the target parameter is used to reflect whether the target heat exchange object reaches the required temperature.

[0136] In some embodiments, the control module 22 is specifically used to:

[0137] Based on the difference between the target parameter and the expected parameter, determining a proportional value proportional to the difference and an integral value proportional to the integral of the difference within an integral time;

[0138] The controlled object is controlled based on the sum of the proportional value and the integral value.

[0139] In some embodiments, the control device of the thermal management system further includes a closed-loop control condition determination module, which is used to:

[0140] In the case where the controlled object is the opening of the integrated valve, if the heat exchange demand parameter is the first heat exchange demand parameter or the second heat exchange demand parameter, it is determined that the heat exchange demand parameter meets the closed-loop control condition;

[0141] Wherein, the first heat exchange demand parameter includes:

[0142] The target heat exchange object is the engine;

[0143] The difference between the engine water outlet temperature and the expected water outlet temperature is greater than the temperature threshold;

[0144] The radiator full-opening request is not received when only the engine has a heat exchange demand, or the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled, or the engine inlet and outlet temperature difference control mode is enabled;

[0145] The second heat exchange demand parameters include:

[0146] The target heat exchange object includes at least one of a battery and a cabin and an engine;

[0147] The engine is in a hot state;

[0148] No integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine have heat exchange requirements at the same time, or the engine inlet and outlet temperature difference control mode is enabled;

[0149] Among them, the engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and outlet reach the first desired temperature difference, and the exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach the second desired temperature difference.

[0150] In some embodiments, the control module 21 is further configured to:

[0151] If the heat exchange demand parameters do not meet the closed-loop control conditions, and the heat exchange demand parameters include:

[0152] The target heat exchange object is the engine;

[0153] The difference between the engine water outlet temperature and the expected water outlet temperature is greater than the temperature threshold;

[0154] A radiator full-open request is received when only the engine has a heat exchange demand;

[0155] The exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled;

[0156] The engine inlet and outlet temperature difference control mode is not enabled;

[0157] The opening of the integrated valve is controlled to be the first target opening so that the coolant passage of the radiator is fully open and the warm air circuit is fully closed.

[0158] In some embodiments, the closed-loop control condition determination module is further configured to:

[0159] When the controlled object is the speed of a water pump, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirements:

[0160] The engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and outlet reach a first desired temperature difference;

[0161] The exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a second desired temperature difference;

[0162] The engine outlet water temperature enhanced heat dissipation mode is used to make the engine outlet temperature reach the desired outlet temperature at a first temperature change rate;

[0163] The first normal mode is used to make the water outlet temperature of the engine reach the desired water outlet temperature at a second temperature change rate, and the second temperature change rate is smaller than the first temperature change rate.

[0164] In some embodiments, in the engine outlet water temperature enhanced heat dissipation mode, the expected parameters include the sum of the expected outlet temperature and a first calibrated temperature, and the first calibrated temperature is used to reduce the final speed of the water pump when the water pump and the integrated valve jointly control the engine outlet temperature.

[0165] In some embodiments, the closed-loop control condition determination module is further configured to:

[0166] When the controlled object is the speed of the cooling fan, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirements:

[0167] The engine inlet water temperature enhanced heat dissipation mode is used to make the engine water inlet temperature reach the desired water inlet temperature at a third temperature change rate;

[0168] The second normal mode is used to make the engine water inlet temperature reach the desired water inlet temperature at a fourth temperature change rate, and the fourth temperature change rate is less than the third temperature change rate.

[0169] In some embodiments, in the engine inlet water temperature enhanced heat dissipation mode, the expected parameters include the sum of the expected water inlet temperature and a second calibrated temperature, and the second calibrated temperature is used to reduce the final speed of the cooling fan when the cooling fan and the air intake grille jointly control the engine water inlet temperature.

[0170] In some embodiments, the control module 21 is further configured to:

[0171] If the engine is in a hot state and the cooling fan speed is at the minimum speed, when the opening of the air intake grille reaches the second target opening, and the engine water inlet temperature is lower than the expected water inlet temperature, the cooling fan is controlled to maintain the minimum speed.

[0172] The control device of the thermal management system disclosed in the above embodiments can execute the control method of the thermal management system disclosed in the above embodiments, and has the same or corresponding beneficial effects, which will not be described again to avoid repetition.

[0173] The embodiment of the present disclosure also provides a computer-readable storage medium, which stores a program or instruction, and the program or instruction enables a computer to execute the steps of any of the above methods.

[0174] Exemplarily, the program or instruction enables a computer to execute a control method of a thermal management system, the method comprising:

[0175] When the target heat exchange object has a heat exchange demand, determining a current heat exchange demand parameter, wherein the heat exchange demand parameter is used to reflect a control strategy for the controlled object;

[0176] If the heat exchange demand parameter meets the closed-loop control condition, the controlled object is controlled to adjust the target parameter based on the difference between the target parameter and the expected parameter so that the difference between the target parameter and the expected parameter meets the expected error; wherein the target parameter is used to reflect whether the target heat exchange object has reached the required temperature.

[0177] Optionally, when executed by a computer processor, the computer executable instructions may also be used to execute the technical solution of any of the above-mentioned control methods of the thermal management system provided in the embodiments of the present disclosure, thereby achieving corresponding beneficial effects.

[0178] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the embodiments of the present disclosure can be implemented with the help of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the embodiments of the present disclosure is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present disclosure.

[0179] The embodiment of the present disclosure also provides a vehicle, comprising: one or more processors; a memory for storing one or more programs or instructions; the processor calls the programs or instructions stored in the memory to execute the steps of any of the above methods to achieve corresponding beneficial effects.

[0180] Figure 3 Schematic diagram of the hardware structure of a vehicle provided in an embodiment of the present disclosure. Figure 3 As shown, the vehicle includes one or more processors 301 and memory 302 .

[0181] The processor 301 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the vehicle to perform desired functions.

[0182] The memory 302 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 301 may run the program instructions to implement the control method of the thermal management system of the embodiment of the present disclosure described above, and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage medium.

[0183] In one example, the vehicle may further include: an input device 303 and an output device 304 , and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0184] In addition, the input device 303 may also include, for example, a keyboard, a mouse, and the like.

[0185] The output device 304 can output various information to the outside, including the determined distance information, direction information, etc. The output device 304 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0186] Of course, to simplify, Figure 3 Only some of the components in the vehicle related to the present disclosure are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, the vehicle may further include any other appropriate components according to specific application scenarios.

[0187] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0188] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a thermal management system, It is characterized in that include: When the target heat exchange object has a heat exchange demand, determining a current heat exchange demand parameter, wherein the heat exchange demand parameter is used to reflect a control strategy for the controlled object; If the heat exchange demand parameter meets the closed-loop control condition, the controlled object is controlled to adjust the target parameter based on the difference between the target parameter and the expected parameter so that the difference between the target parameter and the expected parameter meets the expected error; wherein the target parameter is used to reflect whether the target heat exchange object has reached the required temperature.

2. The method according to claim 1, It is characterized in that The controlling the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter includes: Based on the difference between the target parameter and the expected parameter, determining a proportional value proportional to the difference and an integral value proportional to the integral of the difference within an integral time; The controlled object is controlled based on the sum of the proportional value and the integral value.

3. The method according to claim 2, It is characterized in that The method further comprises: In the case where the controlled object is the opening of the integrated valve, if the heat exchange demand parameter is the first heat exchange demand parameter or the second heat exchange demand parameter, determining that the heat exchange demand parameter satisfies the closed-loop control condition; Wherein, the first heat exchange requirement parameter includes: The target heat exchange object is an engine; The difference between the engine water outlet temperature and the expected water outlet temperature is greater than the temperature threshold; The radiator full-opening request is not received when only the engine has a heat exchange demand, or the exhaust gas recirculation inlet and outlet temperature difference control mode is enabled, or the engine inlet and outlet temperature difference control mode is enabled; The second heat exchange requirement parameter includes: The target heat exchange object includes at least one of a battery and a cabin and an engine; The engine is in a hot state; No integrated valve open-loop control request is received when at least one of the battery and the cabin and the engine have heat exchange requirements at the same time, or the engine inlet and outlet temperature difference control mode is enabled; Among them, the engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and outlet reach a first desired temperature difference, and the exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a second desired temperature difference.

4. The method according to claim 3, It is characterized in that The method further comprises: If the heat exchange demand parameters do not meet the closed-loop control conditions, and the heat exchange demand parameters include: The target heat exchange object is an engine; The difference between the engine water outlet temperature and the expected water outlet temperature is greater than the temperature threshold; A radiator full-open request is received when only the engine has a heat exchange demand; The exhaust gas recirculation inlet and outlet temperature difference control mode is not enabled; The engine inlet and outlet temperature difference control mode is not enabled; The opening degree of the integrated valve is controlled to be a first target opening degree so that the coolant passage of the radiator is fully opened and the warm air circuit is fully closed.

5. The method according to claim 2, It is characterized in that The method further comprises: In the case where the controlled object is the speed of a water pump, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirement: An engine inlet and outlet temperature difference control mode, wherein the engine inlet and outlet temperature difference control mode is used to make the temperature difference between the engine water inlet and the water outlet reach a first desired temperature difference; an exhaust gas recirculation inlet and outlet temperature difference control mode, wherein the exhaust gas recirculation inlet and outlet temperature difference control mode is used to make the temperature difference between the exhaust gas recirculation inlet and outlet reach a second desired temperature difference; An engine outlet water temperature enhanced heat dissipation mode, wherein the engine outlet water temperature enhanced heat dissipation mode is used to make the engine outlet temperature reach a desired outlet temperature at a first temperature change rate; A first normal mode is used to make the water outlet temperature of the engine reach a desired water outlet temperature at a second temperature change rate, wherein the second temperature change rate is smaller than the first temperature change rate.

6. The method according to claim 5, It is characterized in that In the engine outlet water temperature enhanced heat dissipation mode, the expected parameter includes the sum of the expected water outlet temperature and the first calibration temperature, and the first calibration temperature is used to reduce the final speed of the water pump when the water pump and the integrated valve jointly control the engine outlet temperature.

7. The method according to claim 2, It is characterized in that The method further comprises: In the case where the controlled object is the speed of a cooling fan, if the heat exchange demand parameter is any of the following control modes, it is determined that the heat exchange demand parameter meets the closed-loop control requirement: an engine inlet water temperature enhanced heat dissipation mode, wherein the engine inlet water temperature enhanced heat dissipation mode is used to make the engine water inlet temperature reach a desired water inlet temperature at a third temperature change rate; The second normal mode is used to make the engine water inlet temperature reach the desired water inlet temperature at a fourth temperature change rate, and the fourth temperature change rate is smaller than the third temperature change rate.

8. The method according to claim 7, It is characterized in that In the engine inlet water temperature enhanced heat dissipation mode, the expected parameter includes the sum of the expected water inlet temperature and a second calibrated temperature, and the second calibrated temperature is used to reduce the final speed of the cooling fan when the cooling fan and the air intake grille jointly control the engine water inlet temperature.

9. The method according to claim 7, It is characterized in that The method further comprises: If the engine is in a hot state, and when the speed of the cooling fan is at the minimum speed, when the opening of the air intake grille reaches the second target opening, and the engine water inlet temperature is lower than the expected water inlet temperature, the cooling fan is controlled to maintain the minimum speed.

10. A control device for a thermal management system, It is characterized in that include: A heat exchange demand parameter determination module, used to determine the current heat exchange demand parameter when the target heat exchange object has a heat exchange demand, wherein the heat exchange demand parameter is used to reflect the control strategy for the controlled object; A control module is used to control the controlled object to adjust the target parameter based on the difference between the target parameter and the expected parameter if the heat exchange demand parameter meets the closed-loop control condition, so that the difference between the target parameter and the expected parameter meets the expected error; wherein the target parameter is used to reflect whether the target heat exchange object has reached the required temperature.

11. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores a program or instruction, and the program or instruction enables a computer to execute the steps of the method according to any one of claims 1 to 9.

12. A vehicle, It is characterized in that include: one or more processors; A memory for storing one or more programs or instructions; The processor is used to execute the steps of the method according to any one of claims 1 to 9 by calling the program or instruction stored in the memory.

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