Control Method, Device, Equipment and Medium for Electric Water Pump of Vehicle Engine

Abstract

The present invention discloses a control method, device, equipment and medium for an electric water pump of a vehicle engine. The features include that when the engine of the vehicle is running, the temperature of the coolant at the engine outlet is obtained; if the temperature of the coolant at the engine outlet is less than a preset temperature threshold, the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the liquid temperature of the coolant at the engine outlet are obtained; and the speed of the electric water pump is adjusted to a target speed according to the liquid temperature difference and the engine speed. It is realized that during the operation of the engine, the electric water pump can timely follow up the operating conditions of the engine, avoid the risk of local overheating of the engine cylinder head water jacket caused by violent driving of the vehicle, improve the environmental adaptability of the electric water pump cooling, enable the thermal management system of the vehicle to cool accurately, efficiently and energy-savingly.

Description

Technical Field

[0001] The present invention relates to the field of vehicle engine control, and particularly to a control method, device, equipment and medium for an electric water pump of a vehicle engine. Background Art

[0002] In existing hybrid vehicles, hybrid vehicles generally include two power sources, a high-voltage power system and an engine system. Due to the high degree of electrification of hybrid vehicles, a more intelligent electric water pump can be used for heat dissipation. The electric water pump usually has no mechanical connection with the engine and is decoupled from the engine speed. Therefore, the electric water pump can achieve the best temperature distribution with lower power consumption and less coolant flow. Currently, the electric water pump in a hybrid vehicle includes a motor and a water pump arranged inside, and then the rotation of the motor drives the water pump to adjust the coolant circulation flow rate and speed. In the prior art, for the speed control of the electric water pump of a hybrid vehicle engine, usually when the engine needs to be cooled, the vehicle supplies power to the electric water pump to dissipate heat from the engine, without adjusting according to the actual working conditions of the engine, resulting in poor cooling ability of the electric water pump and insufficient adaptability to various working conditions of the engine. Summary of the Invention

[0003] The present invention provides a control method, device, equipment and medium for an electric water pump of a vehicle engine to achieve precise cooling of different working conditions of a hybrid vehicle engine.

[0004] According to one aspect of the present invention, a control method for an electric water pump of a vehicle engine is provided, including:

[0005] When the engine of the vehicle is in operation, obtain the temperature of the coolant at the engine outlet;

[0006] If the temperature of the coolant at the engine outlet is less than a preset temperature threshold, obtain the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the coolant temperature at the engine outlet;

[0007] Adjust the speed of the electric water pump to a target speed according to the temperature difference and the engine speed.

[0008] According to another aspect of the present invention, a control device for an electric water pump of a vehicle engine is provided, including:

[0009] An engine working condition judgment module, configured to obtain the temperature of the coolant at the engine outlet when the engine of the vehicle is in operation;

[0010] An engine cold start module, configured to obtain the engine speed and the temperature difference between the engine cylinder head coolant temperature and the coolant temperature at the engine water outlet if the temperature of the coolant at the engine water outlet is less than a preset temperature threshold.

[0011] An electric water pump control module, configured to adjust the speed of the electric water pump to a target speed according to the liquid temperature difference and the engine speed.

[0012] According to another aspect of the present invention, there is provided an electronic device, including:

[0013] At least one processor; and

[0014] A memory communicatively connected to the at least one processor; wherein,

[0015] The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the control method of the electric water pump of the vehicle engine according to any embodiment of the present invention.

[0016] According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for enabling a processor to implement the control method of the electric water pump of the vehicle engine according to any embodiment of the present invention when executed.

[0017] The technical solution of the embodiment of the present invention obtains the temperature of the coolant at the engine water outlet when the engine of the vehicle is running, and detects the temperature of the coolant at the engine water outlet when it is detected that the engine is running, and determines whether heat dissipation is required under the current working condition of the engine, so as to prevent the engine of the vehicle from overheating under the current working condition, and can strengthen the thermal management of the engine; if the temperature of the coolant at the engine water outlet is less than a preset temperature threshold, the engine speed and the temperature difference between the engine cylinder head coolant temperature and the coolant temperature at the engine water outlet are obtained. When the temperature of the coolant at the engine water outlet is less than the preset temperature threshold, by determining the temperature difference between the engine cylinder head coolant temperature and the coolant temperature at the engine water outlet, the current corresponding operating condition of the engine is determined, and the corresponding electric water pump cooling method is set to achieve precise control of the engine cooling; the speed of the electric water pump is adjusted to the target speed according to the liquid temperature difference and the engine speed. By controlling the speed of the electric water pump through the temperature difference, precise control of the engine temperature is achieved, and when the engine is in different working conditions, the temperature of the engine is timely controlled according to different temperature management strategies, reducing the driving risk of hybrid vehicles, solving the technical problem in the prior art that the engine under different working conditions cannot be precisely thermally managed, improving the environmental adaptability of the electric water pump cooling, and being able to precisely cool the thermal management system of the vehicle, being efficient and energy-saving.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a flowchart of a control method for an electric water pump of a vehicle engine provided in Embodiment 1 of the present invention;

[0021] Figure 2 is a flowchart of another control method for an electric water pump of a vehicle engine provided in Embodiment 2 of the present invention;

[0022] Figure 3 is a schematic structural diagram of a control device for an electric water pump of a vehicle engine provided in Embodiment 3 of the present invention;

[0023] Figure 4 is a schematic structural diagram of an electronic device for implementing the control method of the electric water pump of the vehicle engine in the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Embodiment 1

[0026] Figure 1 is a flowchart of a control method for an electric water pump of a vehicle engine provided in Embodiment 1 of the present invention. This embodiment is applicable to a method for judging different working conditions of the engine and performing corresponding cooling. This method can be executed by a control device for an electric water pump of a vehicle engine. The control device for an electric water pump of a vehicle engine can be implemented in the form of hardware and / or software, and the control device for an electric water pump of a vehicle engine can be configured in an electronic device. As Figure 1 shown, the method includes:

[0027] S110. When the engine of the vehicle is running, obtain the temperature of the coolant at the engine water outlet.

[0028] Herein, the coolant at the engine water outlet can be the water outlet of the coolant in the engine.

[0029] Optionally, in the embodiment of the present invention, a detection sensor for detecting the engine is arranged in the engine of the vehicle. When the running state of the engine is detected by the detection sensor, control the temperature sensor preset at the engine water outlet to obtain the temperature of the coolant at the engine water outlet.

[0030] Optionally, when the engine is running, to ensure the normal operation of each component of the engine, it is necessary to control the oil temperature of the oil in the engine to prevent each component of the engine from overheating and affecting the engine performance. Furthermore, when the oil temperature of the oil in the engine is too high, it is necessary to cool down the oil in the engine. The coolant of the engine is used to cool down the engine oil, and at the same time, cool down the engine.

[0031] Specifically, when it is detected that the engine is in the running state, detect the temperature of the coolant at the engine water outlet to obtain the temperature of the coolant at the engine water outlet.

[0032] S120. If the temperature of the coolant at the engine water outlet is less than the preset temperature threshold, obtain the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the liquid temperature of the coolant at the engine water outlet.

[0033] Herein, the preset temperature threshold can be a temperature threshold preset for judging the engine operating condition. It should be noted that for different engine operating conditions, the temperature change of the coolant at the engine water outlet is different. Therefore, the current operating condition of the engine can be judged according to the temperature of the coolant at the engine water outlet and the preset temperature threshold, and then a temperature management strategy corresponding to the engine operating condition can be set. Exemplarily, the preset temperature threshold of the coolant at the engine water outlet can be set to 80°C.

[0034] Herein, the coolant temperature of the engine cylinder head can be the temperature of the coolant in the cylinder head of the engine. It should be noted that the function of the coolant in the engine cylinder head is to prevent the engine from being damaged due to excessive heat generated by friction during high-speed operation. In the engine, the coolant in the cylinder head circulates through the circulation pipeline, takes away the heat generated during the engine operation through the coolant, and brings the high-temperature coolant into the radiator for heat dissipation to ensure that the engine can work at a normal temperature.

[0035] Herein, the liquid temperature difference can be the temperature difference between the coolant at the engine water outlet and the coolant temperature of the engine cylinder head. The liquid temperature difference can be used to adjust the operating speed of the electric water pump.

[0036] Among them, the engine speed can be the number of revolutions of the engine crankshaft per unit time. Optionally, in the art, the engine speed is usually the number of revolutions of the engine crankshaft in 1 minute.

[0037] Specifically, obtain the temperature of the coolant at the engine water outlet, and judge the magnitude relationship between the temperature of the coolant at the engine water outlet and the preset temperature threshold. If the temperature of the coolant at the engine water outlet is less than the preset temperature threshold, it means that the engine is in the starting to warm-up working condition. Obtain the engine speed and the liquid temperature difference between the coolant at the engine water outlet and the coolant at the engine cylinder head, and then determine the heat dissipation strategy of the electric water pump for the current engine working condition.

[0038] S130. Adjust the speed of the electric water pump to the target speed according to the liquid temperature difference and the engine speed.

[0039] Among them, the target speed can be the number of revolutions of the motor in the electric water pump per unit time. It should be noted that in the electric water pump, the electric water pump motor is connected to the water pump impeller, and the motor drives the water pump impeller to rotate, so as to achieve the purpose of controlling the coolant circulation flow rate and speed of the electric water pump.

[0040] Optionally, for the engine speed and the liquid temperature difference, the change trend of the temperature inside the engine during the warm-up process of the engine can be determined in advance, and then the electric water pump can be controlled to work according to the change trend of the temperature inside the engine to control the temperature of each component of the engine and prevent the engine temperature from being too high.

[0041] Specifically, for the temperature difference between the coolant at the engine water outlet and the coolant at the engine cylinder head, combined with the engine speed of the engine, determine the target speed of the electric water pump, and then adjust the speed of the electric water pump to the target speed.

[0042] Exemplarily, Table 1 is an example table of the target speed of the electric water pump corresponding to the engine speed and the liquid temperature difference provided by the embodiment of the present invention, as shown in Table 1:

[0043] Table 1. Table of the target speed of the electric water pump corresponding to the engine speed and the liquid temperature difference

[0044] 1000 1500 2000 3000 3500 4000 4500 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5 0.00 0.00 0.00 0.00 0.00 1500 1500 10 0.00 0.00 0.00 0.00 0.00 2000 2500 15 0.00 0.00 0.00 0.00 2500 3000 3500 20 0.00 0.00 0.00 2000 2500 3000 3500 25 1500 1500 1500 2000 2500 3000 3500 30 2000 2000 2000 2000 2500 3000 3500

[0045] Among them, the abscissa in Table 1 is the engine speed, the ordinate is the liquid temperature difference, and the unit table corresponding to the abscissa and ordinate is the target speed. As shown in Table 1, during the engine cold start to warm-up process, the upper left area in the table is marked as 0. At this time, the engine does not need heat dissipation, the electric water pump does not operate, the engine coolant does not circulate, and the generated heat can accumulate quickly, greatly shortening the time for the engine to reach the optimal working temperature. Especially at low ambient temperatures, the engine can achieve rapid warm-up, and at the same time, the power consumption of engine accessories is also reduced. During the engine cold start and temperature rise process, since the electric water pump does not operate and the engine coolant does not circulate, in order to prevent local overheating and boiling of the engine cylinder head water jacket, when the liquid temperature difference is too large and / or the engine speed is too large, the electric water pump operates at the target speed to avoid the risk of local overheating of the engine cylinder head water jacket due to severe cold start driving.

[0046] Optionally, in another alternative embodiment of the present invention, after the temperature of the coolant at the engine outlet is less than the preset temperature threshold, it further includes:

[0047] If a vehicle warm air request is received, the preset constant speed of the electric water pump is determined as the target speed.

[0048] Among them, the vehicle warm air request may be a signal sent when the air conditioning control panel in the vehicle requests warm air. It should be noted that in the vehicle, the air conditioning control panel is connected to the engine electronic control unit. After receiving the warm air signal, the air conditioning control panel sends a warm air request to the engine electronic control unit.

[0049] Among them, the preset constant speed may be a speed set in advance according to the engine heat dissipation requirement. Optionally, in the case where the engine has no heat dissipation requirement, the preset constant speed can be set to 0.

[0050] Optionally, when the vehicle makes a warm air request, the heat dissipation requirement of the engine is less, and there is no need to control the temperature of the engine. Furthermore, the speed of the electric water pump can be set to a fixed speed.

[0051] Specifically, when the warm air request of the vehicle is received, it is necessary to supply warm air to the vehicle, and the heat dissipation requirement of the engine is reduced. Furthermore, the preset constant speed of the electric water pump can be determined as the target speed.

[0052] Optionally, in another alternative embodiment of the present invention, after the engine of the vehicle is in operation, it further includes:

[0053] If the thermal management system of the vehicle cannot operate normally, the maximum speed of the electric water pump is determined as the target speed.

[0054] Among them, the thermal management system may be a system pre-set in the vehicle for thermal management of the vehicle engine.

[0055] Optionally, in the embodiments of the present invention, it is connected to the engine electronic control unit through a thermal management system, and the temperature of the engine is controlled through the thermal management system. The thermal management system may include at least one of a thermal management module, an electric water pump, and a temperature sensor.

[0056] Specifically, when it is detected that the engine is in an operating state, the engine electronic control unit detects whether the thermal management system of the vehicle is operating normally. If the thermal management system of the vehicle cannot operate normally, temperature control cannot be performed for different engine operating conditions. To prevent losses caused by engine overheating, the engine electronic control unit takes the maximum speed of the electric water pump as the target speed, and makes the electric water pump operate at the maximum speed.

[0057] The technical solution of the embodiments of the present invention obtains the temperature of the coolant at the engine outlet when the engine of the vehicle is operating. When it is detected that the engine is running, it detects the temperature of the coolant at the engine outlet, determines whether heat dissipation is required under the current engine operating conditions, prevents the engine from overheating, and strengthens the thermal management of the engine; if the temperature of the coolant at the engine outlet is less than the preset temperature threshold, it obtains the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the liquid temperature of the coolant at the engine outlet. When the temperature of the coolant at the engine outlet is less than the preset temperature threshold, by determining the temperature difference between the coolant temperature of the engine cylinder head and the temperature of the coolant at the engine outlet, the current corresponding operating conditions of the engine are determined, and the corresponding electric water pump cooling method is set to achieve precise control of the engine cooling; according to the liquid temperature difference and the engine speed, the speed of the electric water pump is adjusted to the target speed, and the speed of the electric water pump is controlled by the temperature difference, achieving precise control of the engine temperature, realizing timely temperature control for different engine operating conditions, reducing driving risks, solving the technical problem in the prior art that the engine cannot be precisely thermally managed under different operating conditions, improving the environmental adaptability of the electric water pump cooling, and enabling the thermal management system of the vehicle to precisely cool, efficiently and energy-savingly.

[0058] Embodiment 2

[0059] Figure 2 It is a flowchart of another control method for an electric water pump of a vehicle engine provided by Embodiment 2 of the present invention. The relationship between this embodiment and the above embodiment is the specific method for engine thermal management when the engine of the vehicle enters the warm engine control. As Figure 2 shown, the control method for the electric water pump of the vehicle engine includes:

[0060] S210. When the engine of the vehicle is operating, obtain the temperature of the coolant at the engine outlet.

[0061] S220. If the temperature of the coolant at the engine water outlet is greater than the preset temperature threshold, obtain the engine speed, engine load, vehicle speed, engine oil temperature, engine intake air temperature, ambient temperature, opening degree of the thermal management module, and duty cycle of the electric cooling fan.

[0062] Among them, the engine load can be the load borne by the engine during operation. Exemplarily, the engine load can include at least one of engine torque load, engine power load, and engine heat load.

[0063] Among them, the engine oil temperature can be the temperature of the engine oil used to lubricate each component of the engine.

[0064] Among them, the engine intake air temperature can be the self-temperature of the air entering the engine.

[0065] Optionally, in the embodiments of the present invention, the engine oil temperature and the engine intake air temperature can be detected by an engine sensor provided in the engine.

[0066] Among them, the opening degree of the thermal management module can be the opening degree of the thermal management pipeline controlled by the vehicle thermal management module.

[0067] Among them, the duty cycle of the electric cooling fan can be the actual window size of the circuit within a unit cycle.

[0068] Optionally, the opening degree of the thermal management module and the duty cycle of the electric cooling fan can be detected by a thermal management sensor provided in the vehicle.

[0069] Among them, the ambient temperature can be the ambient temperature of the environment where the vehicle is running.

[0070] Among them, the vehicle speed can be the current driving speed of the vehicle. Optionally, the ambient temperature and the vehicle speed can be detected by the vehicle's vehicle sensor.

[0071] Optionally, when the temperature of the coolant at the engine water outlet is greater than the preset temperature threshold, the engine enters the hot engine control working condition. The engine has reached the optimal working temperature, and it is necessary to set the electric water pump to rotate continuously to control the temperature in the engine and keep the engine at the optimal working temperature.

[0072] Specifically, obtain the temperature of the coolant at the engine water outlet, and judge the magnitude relationship between the temperature of the coolant at the engine water outlet and the preset temperature threshold. If the temperature of the coolant at the engine water outlet is greater than the preset temperature threshold, it means that the engine is in the hot engine control working condition, and obtain the engine speed, engine load, vehicle speed, engine oil temperature, engine intake air temperature, ambient temperature, opening degree of the thermal management module, and duty cycle of the electric cooling fan.

[0073] S230. Determine the base speed of the electric water pump based on the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake air temperature.

[0074] Among them, the base speed can be the initial speed of the electric water pump under the hot engine control condition.

[0075] Specifically, when entering the hot engine control condition of the engine, the electric water pump is controlled and adjusted according to the states of the engine and the vehicle, and the base speed of the electric water pump is determined based on the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake air temperature.

[0076] Optionally, in another alternative embodiment of the present invention, the determining the base speed of the electric water pump according to the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake air temperature includes:

[0077] Determine the first speed of the electric water pump according to the engine speed and the engine load; determine the second speed of the electric water pump according to the vehicle speed and the engine load; determine the third speed of the electric water pump according to the engine oil temperature and the engine load; determine the fourth speed of the electric water pump according to the engine intake air temperature and the engine load;

[0078] Judge the magnitude relationship among the first speed, the second speed, the third speed, and the fourth speed, and determine the maximum speed among the first speed, the second speed, the third speed, and the fourth speed as the base speed.

[0079] The first speed can be the speed determined based on the engine speed and the engine load, and the first speed is used to meet the minimum heat dissipation requirement of the engine.

[0080] The second speed can be the speed determined by the vehicle speed and the engine load, and the second speed is used to meet the minimum heat dissipation requirement of the engine when the vehicle maintains the driving speed.

[0081] Among them, the third speed can be the speed determined by the engine oil temperature and the engine load, and the third speed is used to meet the minimum heat dissipation requirement of the engine when ensuring the engine oil heat dissipation capacity and the lubrication stability of each engine component.

[0082] Among them, the fourth speed can be the speed determined by the engine intake air temperature and the engine load, and the fourth speed is used to ensure the minimum heat dissipation requirement during the normal operation and combustion of the engine.

[0083] Optionally, determine the first speed of the electric water pump according to the engine speed and the engine load respectively; determine the second speed of the electric water pump according to the vehicle speed and the engine load; determine the third speed of the electric water pump according to the engine oil temperature and the engine load; determine the fourth speed of the electric water pump according to the engine intake air temperature and the engine load; under the condition that the vehicle and the engine work normally, determine the maximum speed among the first speed, the second speed, the third speed and the fourth speed as the base speed of the electric water pump.

[0084] Exemplarily, Table 2 is a target speed table of the electric water pump corresponding to the engine speed and the engine load provided by an embodiment of the present invention, as shown in Table 2:

[0085] 1000 1500 2000 3000 3500 4000 4500 10 1500 1500 1500 1500 2000 2000 2000 30 1500 1500 1500 1500 2000 2000 2000 50 2000 2000 2000 2000 2000 2000 2500 80 2000 2000 2000 2000 2500 3000 3500 110 3000 3000 3000 3000 3500 4000 5000 120 3000 3000 3000 3000 3500 4000 5000 150 3000 3000 3000 3000 3500 4000 5000

[0086] Wherein, the abscissa in Table 2 is the engine speed, the ordinate is the engine load, and the unit table corresponding to the abscissa and the ordinate is the target speed of the electric water pump.

[0087] Table 3 is a target speed table of the electric water pump corresponding to the vehicle speed and the engine load provided by an embodiment of the present invention, as shown in Table 3:

[0088] 10 30 50 80 110 120 150 20 1500 1500 1500 1500 2000 2000 2000 40 1500 1500 1500 1500 2000 2000 2000 60 2000 2000 2000 2000 2000 2000 2500 80 2000 2000 2000 2000 2500 3000 3500 100 3000 3000 3000 3000 3500 4000 5000 120 3000 3000 3000 3000 3500 4000 5000 140 3000 3000 3000 3000 3500 4000 5000

[0089] Wherein, the abscissa in Table 3 is the vehicle speed, the ordinate is the engine load, and the unit table corresponding to the abscissa and the ordinate is the target speed of the electric water pump.

[0090] Table 4 is a target speed table of the electric water pump corresponding to the engine oil temperature and the engine load provided by an embodiment of the present invention, as shown in Table 4:

[0091] 10 30 50 80 110 120 150 -35 1500 1500 1500 1500 2000 2000 2000 -20 1500 1500 1500 1500 2000 2000 2000 -10 2000 2000 2000 2000 2000 2000 2500 0 2000 2000 2000 2000 2500 3000 3500 10 3000 3000 3000 3000 3500 4000 5000 20 3000 3000 3000 3000 3500 4000 5000 35 3000 3000 3000 3000 3500 4000 5000

[0092] Wherein, the abscissa in Table 4 is the vehicle speed, the ordinate is the engine oil temperature, and the unit table corresponding to the abscissa and the ordinate is the target speed of the electric water pump.

[0093] Table 5 is a target speed table of the electric water pump corresponding to the engine intake air temperature and the engine load provided by an embodiment of the present invention, as shown in Table 5:

[0094] -20 -10 0 20 30 40 50 20 1500 1500 1500 1500 2000 2000 2000 40 1500 1500 1500 1500 2000 2000 2000 60 2000 2000 2000 2000 2000 2000 2500 80 2000 2000 2000 2000 2500 3000 3500 100 3000 3000 3000 3000 3500 4000 5000 120 3000 3000 3000 3000 3500 4000 5000 140 3000 3000 3000 3000 3500 4000 5000

[0095] Wherein, the abscissa in Table 5 is the engine intake air temperature, the ordinate is the engine oil temperature, and the unit table corresponding to the abscissa and the ordinate is the target speed of the electric water pump.

[0096] S240. Adjust the base speed of the electric water pump to the target speed according to the ambient temperature, the opening degree of the thermal management module, the duty ratio of the electric cooling fan, and the temperature of the coolant at the engine outlet.

[0097] Optionally, when the engine and the vehicle are operating normally, for the operating conditions of the vehicle and the engine, improve the environmental adaptability of the electric water pump for the hot engine control condition, and adjust the base speed according to the ambient temperature, the opening degree of the thermal management module, the duty ratio of the electric cooling fan, and the temperature of the coolant at the engine outlet, so as to implement the coolant over-temperature protection function.

[0098] Optionally, in another alternative embodiment of the present invention, the adjusting the base speed of the electric water pump to the target speed according to the ambient temperature, the opening degree of the thermal management module, the duty ratio of the electric cooling fan, and the temperature of the coolant at the engine outlet includes: determining a first correction coefficient of the base speed according to the ambient temperature and the temperature of the coolant at the engine outlet; determining a second correction coefficient of the base speed according to the opening degree of the thermal management module and the temperature of the coolant at the engine outlet; determining a third correction coefficient of the base speed according to the duty ratio of the electric cooling fan and the temperature of the coolant at the engine outlet; and adjusting the base speed of the electric water pump to the target speed according to the first correction coefficient, the second correction coefficient, and the third correction coefficient.

[0099] Among them, the first correction parameter can be a correction parameter determined according to the ambient temperature and the temperature of the coolant at the engine outlet; the first correction parameter can be used to improve the adaptability of the electric water pump to the change of the ambient temperature in the current driving environment of the vehicle.

[0100] Among them, the second modification parameter can be a correction parameter determined according to the opening degree of the thermal management module and the temperature of the coolant at the engine outlet; the second correction parameter can be used to improve the adaptability of the electric water pump to the thermal management module.

[0101] Among them, the third modification parameter can be determined according to the duty ratio of the electric cooling fan and the temperature of the coolant at the engine outlet, and the third modification parameter can be used to improve the adaptability of the electric water pump to the electric cooling fan.

[0102] Specifically, obtain the ambient temperature, the opening degree of the thermal management module, the duty ratio of the electric cooling fan, and the temperature of the coolant at the engine outlet. Determine the first correction factor for the base speed according to the ambient temperature and the temperature of the coolant at the engine outlet, determine the second correction factor for the base speed according to the opening degree of the thermal management module and the temperature of the coolant at the engine outlet, and determine the third correction factor for the base speed according to the duty ratio of the electric cooling fan and the temperature of the coolant at the engine outlet. Then, adjust the base speed of the electric water pump to the target speed through the first correction factor, the second correction factor, and the third correction factor.

[0103] Exemplarily, Table 6 is a table of the first correction factor of the electric water pump corresponding to the ambient temperature and the temperature of the coolant at the engine outlet provided by an embodiment of the present invention. As shown in Table 6:

[0104] -35 -20 -10 0 10 20 35 80 1 1 1 1 1 1 1.2 85 1 1 1 1 1 1 1.2 90 1 1 1 1 1 1 1.2 95 1 1 1 1 1 1 1.2 100 1 1 1 1 1 1 1.2 105 1.5 1.5 1.5 1.5 1.5 1.5 1.5 110 1.8 1.8 1.8 1.8 1.8 1.8 1.8

[0105] Among them, the abscissa in Table 6 is the ambient temperature, the ordinate is the temperature of the coolant at the engine outlet, and the unit table corresponding to the abscissa and ordinate is the first correction factor of the electric water pump.

[0106] Table 7 is a table of the second correction factor of the electric water pump corresponding to the opening degree of the thermal management module and the temperature of the coolant at the engine outlet provided by an embodiment of the present invention. As shown in Table 7:

[0107] 80 85 90 95 100 105 110 20 1 1 1 1 1 1.5 1.8 30 1 1 1 1 1 1.5 1.8 40 1 1 1 1 1 1.5 1.8 50 1 1 1 1 1 1.5 1.8 70 1 1 1 1 1 1.5 1.8 90 1.5 1.5 1.5 1.5 1.5 1.5 1.8 100 1.8 1.8 1.8 1.8 1.8 1.8 1.8

[0108] Among them, the ordinate in Table 7 is the opening degree of the thermal management module, the abscissa is the temperature of the coolant at the engine outlet, and the unit table corresponding to the abscissa and ordinate is the second correction factor of the electric water pump.

[0109] Table 8 is a table of the third correction factor of the electric water pump corresponding to the duty ratio of the electric cooling fan and the temperature of the coolant at the engine outlet provided by an embodiment of the present invention. As shown in Table 8:

[0110] 80 85 90 95 100 105 110 10 1 1 1 1 1 1.5 1.8 20 1 1 1 1 1 1.5 1.8 30 1 1 1 1 1 1.5 1.8 50 1 1 1 1 1 1.5 1.8 70 1 1 1 1 1 1.5 1.8 90 1.5 1.5 1.5 1.5 1.5 1.5 1.8 100 1.8 1.8 1.8 1.8 1.8 1.8 1.8

[0111] Among them, the ordinate in Table 8 is the duty ratio of the electric cooling fan, the abscissa is the temperature of the coolant at the engine outlet, and the unit table corresponding to the abscissa and ordinate is the third correction factor of the electric water pump.

[0112] Optionally, in another optional embodiment of the present invention, the adjusting the base speed of the electric water pump to the target speed according to the first correction factor, the second correction factor, and the third correction factor includes:

[0113] Determine the target speed by multiplying the base speed by the product of the first correction factor, the second correction factor, and the third correction factor.

[0114] Specifically, obtain the first correction coefficient, the second correction coefficient, and the third correction coefficient of the base speed, multiply the base speed by the first correction coefficient, the second correction coefficient, and the third correction coefficient, and determine the target speed as the product of the base speed and the first correction coefficient, the second correction coefficient, and the third correction coefficient.

[0115] In the technical solution of the embodiment of the present invention, when the engine of the vehicle is running, the temperature of the coolant at the engine water outlet is obtained. If the temperature of the coolant at the engine water outlet is greater than the preset temperature threshold, the engine speed, the engine load, the vehicle speed, the engine oil temperature, the engine intake temperature, the ambient temperature, the opening of the thermal management module, and the duty cycle of the electric cooling fan are obtained; when it is determined that the engine enters the warm engine control condition, the heat dissipation requirements and the environmental suitability of the engine and the vehicle are determined, improving the accuracy of engine thermal management; according to the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake temperature, the base speed of the electric water pump is determined; calculate to meet the minimum heat dissipation requirements of the vehicle and the engine to ensure the stable operation of the engine and the vehicle and prevent the engine from being damaged; adjust the base speed of the electric water pump to the target speed according to the ambient temperature, the opening of the thermal management module, the duty cycle of the electric cooling fan, and the temperature of the coolant at the engine water outlet, realizing precise control of engine thermal management, realizing timely temperature control for different engine conditions, reducing driving risks, solving the technical problem that the engine cannot be precisely thermally managed under different conditions in the prior art, improving the environmental adaptability of the electric water pump cooling, and enabling the thermal management system of the vehicle to precisely cool, efficiently and energy-savingly.

[0116] Embodiment III

[0117] Figure 3 is a schematic structural diagram of a control device for an electric water pump of a vehicle engine provided by Embodiment III of the present invention. As Figure 3 shown, the device includes: an engine condition judgment module 310, an engine cold start module 320, and an electric water pump control module 330, where,

[0118] The engine condition judgment module 310 is configured to obtain the temperature of the coolant at the engine water outlet when the engine of the vehicle is running;

[0119] The engine cold start module 320 is configured to obtain the engine speed and the temperature difference between the engine cylinder head coolant temperature and the liquid temperature of the coolant at the engine water outlet if the temperature of the coolant at the engine water outlet is less than the preset temperature threshold;

[0120] The electric water pump control module 330 is used to adjust the rotational speed of the electric water pump to a target rotational speed according to the liquid temperature difference and the engine speed.

[0121] In the technical solution of the embodiment of the present invention, when the engine of the vehicle is running, the temperature of the coolant at the engine outlet is obtained. When it is detected that the engine is running, the temperature of the coolant at the engine outlet is detected, and it is judged whether heat dissipation is required under the current working condition of the engine to prevent the engine from overheating and strengthen the thermal management of the engine; if the temperature of the coolant at the engine outlet is less than the preset temperature threshold, the engine speed and the liquid temperature difference between the engine cylinder head coolant temperature and the coolant temperature at the engine outlet are obtained. When the coolant temperature at the engine outlet is less than the preset temperature threshold, by determining the temperature difference between the engine cylinder head coolant temperature and the coolant temperature at the engine outlet, the current corresponding operating condition of the engine is determined, and the corresponding electric water pump cooling method is set to achieve precise control of the engine cooling; the rotational speed of the electric water pump is adjusted to the target rotational speed according to the liquid temperature difference and the engine speed. By controlling the rotational speed of the electric water pump through the temperature difference, precise control of the engine temperature is achieved, timely temperature control for different working conditions of the engine is realized, driving risks are reduced, the technical problem that the engine cannot be precisely thermally managed under different working conditions in the prior art is solved, the environmental adaptability of the electric water pump cooling is improved, and the thermal management system of the vehicle cools precisely, efficiently and energy-savingly.

[0122] Optionally, the device further includes an engine hot start module, an engine heat dissipation management module, and an engine heat dissipation adjustment module; wherein:

[0123] The engine hot start module is used to, if the temperature of the coolant at the engine outlet is greater than the preset temperature threshold, obtain the engine speed, engine load, vehicle speed, engine oil temperature, engine intake temperature, ambient temperature, thermal management module opening degree, and electric radiator fan duty ratio;

[0124] The engine heat dissipation management module is used to determine the basic rotational speed of the electric water pump according to the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake temperature;

[0125] The engine heat dissipation adjustment module is used to adjust the basic rotational speed of the electric water pump to the target rotational speed according to the ambient temperature, the thermal management module opening degree, the electric radiator fan duty ratio, and the temperature of the coolant at the engine outlet.

[0126] Optionally, the engine heat dissipation management module is specifically used for:

[0127] Determine the first rotational speed of the electric water pump according to the engine speed and the engine load;

[0128] Determine a second rotational speed of the electric water pump according to the vehicle speed and the engine load.

[0129] Determine a third rotational speed of the electric water pump according to the engine oil temperature and the engine load.

[0130] Determine a fourth rotational speed of the electric water pump according to the engine intake air temperature and the engine load.

[0131] Judge the magnitude relationship among the first rotational speed, the second rotational speed, the third rotational speed, and the fourth rotational speed, and determine the maximum rotational speed among the first rotational speed, the second rotational speed, the third rotational speed, and the fourth rotational speed as the base rotational speed.

[0132] Optionally, the electric water pump control module is specifically configured to:

[0133] Determine a first correction coefficient of the base rotational speed according to the ambient temperature and the temperature of the coolant at the engine outlet.

[0134] Determine a second correction coefficient of the base rotational speed according to the opening degree of the thermal management module and the temperature of the coolant at the engine outlet.

[0135] Determine a third correction coefficient of the base rotational speed according to the duty ratio of the electric cooling fan and the temperature of the coolant at the engine outlet.

[0136] Adjust the base rotational speed of the electric water pump to the target rotational speed according to the first correction coefficient, the second correction coefficient, and the third correction coefficient.

[0137] Optionally, the electric water pump control module is further specifically configured to:

[0138] Determine the target rotational speed by multiplying the base rotational speed by the product of the first correction coefficient, the second correction coefficient, and the third correction coefficient.

[0139] The system further includes a vehicle warm air module; wherein:

[0140] The vehicle warm air module is configured to, if a vehicle warm air request is received, determine the preset constant rotational speed of the electric water pump as the target rotational speed.

[0141] The system further includes a thermal management module; wherein:

[0142] The thermal management module is configured to, if the thermal management system of the vehicle fails to operate normally, determine the maximum rotational speed of the electric water pump as the target rotational speed.

[0143] The control device of the vehicle engine electric water pump provided by the embodiment of the present invention can execute the control method of the vehicle engine electric water pump provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the method.

[0144] Embodiment 4

[0145] Figure 4 FIG. shows a schematic structural diagram of an electronic device 10 that can be used to implement the embodiments of the present invention. The electronic device is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0146] As Figure 4 shown, the electronic device 10 includes at least one processor 11, and a memory communicatively connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor, and the processor 11 can execute various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0147] A plurality of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0148] The processor 11 may be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the control method for the electric water pump of a vehicle engine.

[0149] In some embodiments, the control method for the electric water pump of a vehicle engine may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the control method for the electric water pump of a vehicle engine described above may be executed. Alternatively, in other embodiments, the processor 11 may be configured to execute the control method for the electric water pump of a vehicle engine in any other suitable manner (e.g., by means of firmware).

[0150] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs, which can be executed and / or interpreted on a programmable system including at least one programmable processor, the programmable processor can be a special or general-purpose programmable processor, can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0151] The computer program for implementing the method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing devices, such that when the computer programs are executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer programs can be executed entirely on the machine, partially on the machine, as an independent software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0152] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0153] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, speech input, or tactile input).

[0154] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0155] A computing system may include a client and a server. The client and the server are generally far from each other and usually interact via a communication network. The relationship between the client and the server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system, solving the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0156] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present invention can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0157] Embodiment 5

[0158] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the steps of the control method of the vehicle engine electric water pump provided in any embodiment of the present invention. The method includes:

[0159] When the engine of the vehicle is running, obtain the temperature of the coolant at the engine water outlet;

[0160] If the temperature of the coolant at the engine water outlet is less than a preset temperature threshold, obtain the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the liquid temperature of the coolant at the engine water outlet;

[0161] Adjust the speed of the electric water pump to a target speed according to the liquid temperature difference and the engine speed.

[0162] The computer storage medium of the embodiments of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this document, the computer-readable storage medium can be any tangible medium that contains or stores a program, which can be used by or in combination with an instruction execution system, apparatus, or device.

[0163] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.

[0164] The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination of the foregoing.

[0165] The computer program code for performing the operations of the present invention may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., connected through the Internet using an Internet service provider).

[0166] Those of ordinary skill in the art should understand that the various modules or steps of the present invention described above may be implemented using a general-purpose computing device. They may be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Optionally, they may be implemented using program code executable by a computer device, so that they can be stored in a storage device and executed by the computing device, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps among them may be fabricated into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0167] It should be understood that various forms of the flow shown above may be used, reordering, adding, or deleting steps. For example, the steps recited in the present invention may be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0168] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for an electric water pump of a vehicle engine, characterized in that, Including: When the engine of the vehicle is running, obtain the temperature of the coolant at the engine outlet. If the temperature of the coolant at the engine outlet is less than a preset temperature threshold, obtain the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the coolant temperature at the engine outlet. Adjust the speed of the electric water pump to a target speed according to the temperature difference and the engine speed.

2. The method according to claim 1, wherein , After obtaining the temperature of the coolant at the engine outlet, it further includes: If the temperature of the coolant at the engine outlet is greater than the preset temperature threshold, obtain the engine speed, engine load, vehicle speed, engine oil temperature, engine intake temperature, ambient temperature, heat management module opening, and electric radiator fan duty cycle. Determine the basic speed of the electric water pump according to the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake temperature. Adjust the basic speed of the electric water pump to the target speed according to the ambient temperature, the heat management module opening, the electric radiator fan duty cycle, and the temperature of the coolant at the engine outlet.

3. The method according to claim 2, wherein , The determining the basic speed of the electric water pump according to the engine speed, the engine load, the vehicle speed, the engine oil temperature, and the engine intake temperature includes: Determine the first speed of the electric water pump according to the engine speed and the engine load. Determine the second speed of the electric water pump according to the vehicle speed and the engine load. Determine the third speed of the electric water pump according to the engine oil temperature and the engine load. Determine the fourth speed of the electric water pump according to the engine intake temperature and the engine load. Judge the magnitude relationship among the first speed, the second speed, the third speed, and the fourth speed, and determine the maximum speed among the first speed, the second speed, the third speed, and the fourth speed as the basic speed.

4. The method according to claim 3, wherein , The adjusting the basic speed of the electric water pump to the target speed according to the ambient temperature, the heat management module opening, the electric radiator fan duty cycle, and the temperature of the coolant at the engine outlet includes: Determine the first correction coefficient of the basic speed according to the ambient temperature and the temperature of the coolant at the engine outlet. Determine the second correction coefficient of the basic speed according to the heat management module opening and the temperature of the coolant at the engine outlet. Determine the third correction coefficient of the basic speed according to the electric radiator fan duty cycle and the temperature of the coolant at the engine outlet. Adjust the basic speed of the electric water pump to the target speed according to the first correction coefficient, the second correction coefficient, and the third correction coefficient.

5. The method according to claim 4, characterized in that , The adjusting the basic speed of the electric water pump to the target speed according to the first correction coefficient, the second correction coefficient, and the third correction coefficient includes: Determine the target speed by multiplying the basic speed by the product of the first correction coefficient, the second correction coefficient, and the third correction coefficient.

6. The method according to claim 1, wherein After the temperature of the coolant at the engine water outlet is less than the preset temperature threshold, the following steps are further included: If a vehicle warm air request is received, determine the preset constant speed of the electric water pump as the target speed.

7. The method according to claim 1, characterized in that, After the engine of the vehicle is in operation, the following steps are further included: If the vehicle's thermal management system cannot operate properly, determine the maximum speed of the electric water pump as the target speed.

8. A control device for an electric water pump of a vehicle engine, characterized in that, It includes: An engine condition judgment module, configured to obtain the temperature of the coolant at the engine water outlet when the engine of the vehicle is in operation; An engine cold start module, configured to obtain the engine speed and the temperature difference between the coolant temperature of the engine cylinder head and the liquid temperature of the coolant at the engine water outlet if the temperature of the coolant at the engine water outlet is less than the preset temperature threshold; An electric water pump control module, configured to adjust the speed of the electric water pump to the target speed according to the liquid temperature difference and the engine speed.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the electric water pump of the vehicle engine according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and the computer instructions are used to implement the control method of the electric water pump of the vehicle engine according to any one of claims 1-7 when executed by a processor.

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