Electric vehicle high-speed running heat management control method and device and medium

Abstract

The invention discloses an electric vehicle high-speed running heat management control method and device and a medium. The method comprises the steps that on the basis of vehicle state data of an electric vehicle, under the condition that the electric vehicle is in a preset high-speed running state, if the temperature of a plurality of target parts in the electric vehicle exceeds a preset value, the target parts are started; if yes, a heat dissipation system assembly of the electric vehicle is closed through a whole vehicle heat management controller, the heat management system power of the electric vehicle is limited through an air conditioner controller, and the electric energy loss of the electric vehicle is reduced. According to the electric vehicle high-speed running heat management control method and device and the medium, by accurately controlling operation of a heat management system and a heat dissipation system assembly, the energy utilization efficiency of an electric vehicle can be improved, unnecessary heat dissipation assemblies can be closed, the power of the heat management system can be limited, energy waste can be reduced, and the service life of the electric vehicle can be prolonged. The electric vehicle is more energy-saving in a high-speed driving state, and the problem that the electric energy loss of the electric vehicle is difficult to reduce through effective whole vehicle heat management can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a method, device and medium for controlling thermal management of electric vehicles during high-speed driving. Background Art

[0002] As a clean and efficient means of transportation, electric vehicles are gradually becoming the mainstream of the market. Due to the emergence of problems such as natural battery loss, motor and electronic equipment loss, charging equipment loss, battery temperature influence and battery aging, how to effectively reduce the power loss of electric vehicles and extend the driving range has become the focus of attention of the majority of electric vehicle users. At present, the main methods to reduce the power loss of electric vehicles and improve energy efficiency are to maintain proper tire pressure, regularly maintain vehicle parts, drive smoothly to avoid sudden acceleration, and maintain a proper speed.

[0003] For electric vehicles, battery performance and life are closely related to temperature. High temperature will accelerate battery aging, while low temperature will affect the battery's endurance and charging and discharging efficiency. Therefore, effective thermal management is crucial to reducing power loss, improving battery performance and extending battery life. However, existing technologies have failed to fully consider the thermal management of the entire vehicle during high-speed driving, making it difficult to effectively reduce the power loss of electric vehicles. Summary of the invention

[0004] The present invention provides a method, device and medium for controlling thermal management of an electric vehicle during high-speed driving, so as to solve the problem that it is difficult to reduce the power loss of the electric vehicle through effective thermal management of the entire vehicle.

[0005] Obtain vehicle status data of electric vehicles;

[0006] Based on the vehicle status data, when the electric vehicle is in a preset high-speed driving state, if the temperature of several target components in the electric vehicle exceeds preset values, the cooling system components of the electric vehicle are shut down through the vehicle thermal management controller, and the thermal management system power of the electric vehicle is limited through the air-conditioning controller to reduce the power loss of the electric vehicle.

[0007] In the present invention, since electric vehicles need to overcome greater air resistance and rolling resistance when driving at high speed, the energy consumption of electric vehicles is usually higher when driving at high speed; by judging whether the electric vehicle is in a high-speed driving state, energy-saving measures can be taken more specifically, that is, the thermal management system and heat dissipation system components are adjusted only when the electric vehicle is driving at high speed, which can avoid unnecessary energy consumption increase. When the electric vehicle is driving at high speed and the temperature of the target component is too high, the heat dissipation system components may over-operate and consume a lot of electrical energy. By shutting down these components through the vehicle thermal management controller, unnecessary energy consumption can be significantly reduced. At the same time, the operation of the air-conditioning system will also increase the power loss of the electric vehicle. When driving at high speed and needing to reduce energy consumption, the air-conditioning controller can limit the power of the thermal management system to reduce the energy consumption of the air-conditioning system, thereby further reducing the total energy consumption of the electric vehicle.

[0008] Compared with the prior art, the present invention can improve the energy utilization efficiency of electric vehicles by precisely controlling the operation of the thermal management system and the heat dissipation system components, shutting down unnecessary heat dissipation components and limiting the power of the thermal management system, thereby reducing energy waste and making electric vehicles more energy-efficient when driving at high speeds. Therefore, it can solve the problem of difficulty in reducing the power loss of electric vehicles through effective vehicle thermal management.

[0009] As a preferred solution, if the temperature of several target components in the electric vehicle exceeds a preset value, the cooling system components of the electric vehicle are turned off by the vehicle thermal management controller, and the thermal management system power of the electric vehicle is limited by the air conditioning controller to reduce the power loss of the electric vehicle, specifically:

[0010] If the temperature of the target components in the electric vehicle exceeds a preset value, the grille and the electronic fan of the electric vehicle are turned off by the vehicle thermal management controller, and the compressor power and the PTC heater power of the electric vehicle are limited by the air conditioning controller to reduce the power loss of the electric vehicle;

[0011] Among them, the several target components include batteries, motors, motor controllers and charging and distribution systems.

[0012] In this preferred solution, when the temperature of key components of the electric vehicle, such as the battery, motor, motor controller and charging and distribution system, is too high, the grille and electronic fan can be closed in time by the vehicle thermal management controller, and the compressor power and PTC heater power can be limited. This can effectively reduce the temperature of these components and prevent performance degradation, damage or even safety accidents caused by overheating.

[0013] As a preferred solution, the grille and the electronic fan of the electric vehicle are turned off by the vehicle thermal management controller, specifically:

[0014] If the temperatures of the target components do not exceed the corresponding preset values, all grilles and electronic fans of the electric vehicle are turned off by the vehicle thermal management controller;

[0015] If any temperature of the target components exceeds a corresponding preset value, the current opening state of the grille and the current state of the electronic fan in the electric vehicle are maintained.

[0016] In this preferred solution, when the temperature of the target components does not exceed the preset value, closing all grilles and electronic fans of the electric vehicle can reduce unnecessary energy consumption; wherein, closing the grilles helps to reduce wind resistance, thereby reducing the energy consumption of the electric vehicle during driving, and closing the electronic fans also avoids the power consumption caused by excessive heat dissipation. When the temperature of the target components exceeds the preset value, maintaining the current state of the grilles and electronic fans can ensure that the thermal management system of the electric vehicle can effectively dissipate heat, prevent components from overheating, and thus protect the performance and safety of the electric vehicle.

[0017] As a preferred solution, the compressor power and the PTC heater power of the electric vehicle are limited by the air-conditioning controller, specifically:

[0018] Acquiring the ambient temperature of the electric vehicle from the vehicle status data;

[0019] When the electric vehicle does not turn on the defrosting and defogging function, if the ambient temperature is within a preset range, the compressor power and the PTC heater power are limited to within a preset maximum value through the air-conditioning controller according to the ambient temperature;

[0020] If the ambient temperature is not within the preset range, the compressor power and the PTC heater power are not limited.

[0021] This preferred solution limits the power of the compressor and PTC heater according to the ambient temperature when the defrost and defog functions of the electric vehicle are not turned on, which can significantly optimize energy consumption. In addition, the control strategy can intelligently adapt to changes in ambient temperature. When the ambient temperature exceeds the preset range, the power of the compressor and PTC heater is not limited to ensure that the vehicle can cope with extreme weather conditions such as severe cold or heat. This intelligent adaptability helps to improve the reliability and stability of the vehicle.

[0022] As a preferred solution, when the electric vehicle is in a preset high-speed driving state, specifically:

[0023] The speed of the electric vehicle is obtained from the vehicle status data. If the speed is greater than a preset value and lasts for more than a preset time, the electric vehicle is in the high-speed driving state.

[0024] In this preferred solution, the energy consumption of an electric vehicle is relatively high when traveling at high speed. By determining whether the electric vehicle is in a high-speed driving state, the energy consumption can be managed more accurately to avoid unnecessary energy waste.

[0025] The present application also provides a thermal management control device for high-speed driving of an electric vehicle, comprising a data module and a control module;

[0026] Wherein, the data module is used to obtain vehicle status data of the electric vehicle;

[0027] The control module is used to reduce the power loss of the electric vehicle by shutting down the cooling system components of the electric vehicle through the vehicle thermal management controller and limiting the thermal management system power of the electric vehicle through the air-conditioning controller based on the vehicle status data when the electric vehicle is in a preset high-speed driving state if the temperature of several target components in the electric vehicle exceeds preset values.

[0028] As a preferred solution, the control module includes a control unit;

[0029] Wherein, the control unit is used to reduce the power loss of the electric vehicle by closing the grille and the electronic fan of the electric vehicle through the vehicle thermal management controller and limiting the compressor power and the PTC heater power of the electric vehicle through the air conditioning controller if the temperature of the several target components in the electric vehicle exceeds a preset value;

[0030] Among them, the several target components include batteries, motors, motor controllers and charging and distribution systems.

[0031] As a preferred solution, the control unit includes a closing subunit and a holding subunit;

[0032] Wherein, the closing subunit is used to close all grilles and electronic fans of the electric vehicle through the vehicle thermal management controller if the temperatures of the several target components do not exceed the corresponding preset values;

[0033] The maintaining subunit is used to maintain the current opening state of the grille and the current state of the electronic fan in the electric vehicle if any temperature of the several target components exceeds the corresponding preset value.

[0034] As a preferred solution, the control unit includes a temperature subunit, a limiting subunit and a maintaining subunit;

[0035] Wherein, the temperature subunit is used to obtain the ambient temperature of the electric vehicle from the vehicle status data;

[0036] The limiting subunit is used for limiting the compressor power and the PTC heater power within a preset maximum value through the air-conditioning controller according to the high and low ambient temperature when the defrosting and defogging functions of the electric vehicle are not turned on and if the ambient temperature is within a preset range;

[0037] The maintaining subunit is used for not limiting the compressor power and the PTC heater power if the ambient temperature is not within the preset range.

[0038] As a preferred solution, when the electric vehicle is in a preset high-speed driving state, specifically:

[0039] The speed of the electric vehicle is obtained from the vehicle status data. If the speed is greater than a preset value and lasts for more than a preset time, the electric vehicle is in the high-speed driving state.

[0040] The present application also provides a storage medium having a computer program stored thereon. The computer program is called and executed by a computer to implement the above-mentioned thermal management control method for high-speed driving of an electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of a thermal management control method for high-speed driving of an electric vehicle provided in an embodiment of the present application;

[0042] Figure 2 is a control flow chart provided in an embodiment of the present application;

[0043] Figure 3 This is a comparison diagram of the distribution of the endurance attenuation rate provided in the embodiment of the present application;

[0044] Figure 4 It is a structural schematic diagram of a thermal management control device for high-speed driving of an electric vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In the description of the present application, unless otherwise specified, “several” means two or more.

[0047] A thermal management control method for high-speed driving of an electric vehicle provided in an embodiment of the present application is mainly used to optimize the control strategy of user segmentation scenarios on the basis of ensuring that the power battery and other automotive components operate within a reasonable temperature range, so as to reduce the high-speed endurance attenuation of the electric vehicle.

[0048] Embodiment 1:

[0049] See also Figure 1 The embodiment of the present application provides a method for controlling thermal management of electric vehicles at high speeds, including S1 to S2, and the specific implementation steps are as follows:

[0050] S1. Obtain vehicle status data of the electric vehicle.

[0051] Step S1 of the embodiment of the present application is specifically as follows:

[0052] The vehicle control unit (VCU) is used to monitor the speed signal and running status of the electric vehicle in real time to obtain vehicle status data.

[0053] S2. Based on the vehicle status data, when the electric vehicle is in a preset high-speed driving state, if the temperature of several target components in the electric vehicle exceeds the preset value, the cooling system components of the electric vehicle are turned off through the vehicle thermal management controller, and the thermal management system power of the electric vehicle is limited through the air-conditioning controller to reduce the electric energy loss of the electric vehicle.

[0054] Step S2 of the embodiment of the present application includes S2.1 to S2.4, specifically:

[0055] S2.1. Obtain the speed of the electric vehicle from the vehicle status data. If the speed is greater than a preset value (such as 90 km / h) and continues for more than a preset time (such as 10 minutes), the electric vehicle is in a high-speed driving state.

[0056] In this embodiment S2.1, the energy consumption of an electric vehicle is relatively high when it is running at high speed. By judging whether the electric vehicle is in a high-speed running state, the energy consumption can be managed more accurately to avoid unnecessary energy waste.

[0057] S2.2. When the electric vehicle is in a high-speed driving state, the vehicle thermal management controller (Temperature Management Module for Entire Vehicle, TMM for short) determines whether the temperature of several target components in the electric vehicle exceeds the corresponding preset values; wherein the several target components include batteries, motors, motor controllers and charging and distribution systems.

[0058] If the temperatures of several target components do not exceed the corresponding preset values, all grilles and electronic fans of the electric vehicle are turned off by the vehicle thermal management controller to reduce the power loss of the electric vehicle;

[0059] If any temperature of the target components exceeds a corresponding preset value, the current opening state of the grille and the current state of the electronic fan in the electric vehicle are maintained.

[0060] It should be noted that the control strategy of the above active air intake grille is switch control, and it can also be a more complex control strategy, such as neural network control, etc., the purpose of which is to find the optimal opening of the air intake grille.

[0061] In this embodiment S2.2, when the temperature of the target components does not exceed the preset value, closing all grilles and electronic fans of the electric vehicle can reduce unnecessary energy consumption; wherein, closing the grilles helps to reduce wind resistance, thereby reducing the energy consumption of the electric vehicle during driving, and closing the electronic fans also avoids the power consumption caused by excessive heat dissipation. When the temperature of the target components exceeds the preset value, maintaining the current state of the grilles and electronic fans can ensure that the thermal management system of the electric vehicle can effectively dissipate heat and prevent components from overheating, thereby protecting the performance and safety of the electric vehicle;

[0062] In addition, by judging whether the temperature of several target components is over-temperature, the decision is made to close the grille or maintain the current grille opening. The purpose is to close as many grilles as possible to reduce high-speed wind resistance, thereby reducing the energy consumption used to overcome high-speed wind resistance. Generally speaking, at high speeds, the wind speed flowing through the radiator is relatively high, and when it can meet the cooling requirements of the radiator, the fan can be turned off while driving.

[0063] S2.3, obtaining the ambient temperature of the electric vehicle from the vehicle status data;

[0064] When the defrost and defog functions of an electric vehicle are not turned on, if the ambient temperature is within a preset range, the air-conditioner controller (AC) will limit the power of the compressor to a preset maximum value according to the ambient temperature to reduce the power loss of the electric vehicle; if the ambient temperature is not within the preset range, the compressor power will not be limited.

[0065] Taking a Class A car as an example, the maximum power of the electric air-conditioning compressor is 3500W. When driving at high speed, the air-conditioning controller sets different gradients for the air-conditioning compressor power according to the ambient temperature to limit the power, as follows:

[0066] ①When the ambient temperature is less than 0℃, the compressor power is not limited;

[0067] ②When the ambient temperature is ≥0℃ and <5℃, the maximum value of the compressor power is set to 2500W;

[0068] ③When the ambient temperature is ≥5℃ and <20℃, the maximum value of the compressor power is set to 1500W;

[0069] ④When the ambient temperature is ≥20℃ and <30℃, the maximum value of the compressor power is set to 1000W;

[0070] ⑤When the ambient temperature is ≥30℃ and <35℃, the maximum value of the compressor power is limited to 1500W;

[0071] ⑥When the ambient temperature is ≥35℃ and <40℃, the maximum value of the compressor power is set to 2500W;

[0072] ⑦ When the ambient temperature is ≥40℃, the compressor power is not limited.

[0073] S2.4. When the defrost and defog functions of the electric vehicle are not turned on, if the ambient temperature is within the preset range, the power of the PTC (Positive Temperature Coefficient) heater is limited to a preset maximum value through the air-conditioning controller according to the ambient temperature to reduce the power loss of the electric vehicle; if the ambient temperature is not within the preset range, the power of the PTC heater is not limited.

[0074] Taking a Class A car as an example, the maximum power of the PTC heater is 5000W. When driving at high speed, the air conditioning controller sets different gradients for the PTC heater power according to the ambient temperature to limit the power, as follows:

[0075] ①When the ambient temperature is less than -10℃, the PTC power is not limited;

[0076] ②When the ambient temperature is ≥-10℃ and <0℃, the maximum value of the PTC power limit is set to 3500W;

[0077] ③When the ambient temperature is ≥0℃ and <5℃, the maximum value of the PTC power is limited to 2500W;

[0078] ④When the ambient temperature is ≥5℃ and <15℃, the maximum value of the PTC power limit is set to 2000W;

[0079] ⑤When the ambient temperature is ≥15℃ and <25℃, the maximum value of the PTC power limit is set to 1500W;

[0080] ⑥When the ambient temperature is ≥25℃, the maximum value of the PTC power is limited to 1000W.

[0081] To apply the embodiments of this application, please refer to Figure 2 , Figure 2It is a control flow chart provided in an embodiment of the present application, which shows the general process of performing thermal management of the whole vehicle by controlling the grille, electronic fan, compressor power and PTC heater power, thereby reducing the power loss of the electric vehicle.

[0082] To apply the embodiments of this application, please refer to Figure 3 , Figure 3 is a comparison diagram of the range attenuation rate distribution provided in an embodiment of the present application, showing the range attenuation rate distribution before and after the thermal management control strategy of the electric vehicle is optimized;

[0083] Figure 3 Taking a certain A-class car as an example, the distribution of the range attenuation rate of 1,920 cars under high-speed conditions (vehicle speed ≥ 90km / h) was analyzed before and after the thermal management control strategy was optimized. After the thermal management control strategy was optimized, the range attenuation rate of nearly 70% of users decreased by 5% to 7%, and the range attenuation rate of 30% of users increased, which may be related to intense driving and ultra-high-speed (>120km / h) driving.

[0084] In the present embodiment S2.3 and S2.4, when the defrost and defog functions of the electric vehicle are not turned on, the power of the compressor and the PTC heater is limited according to the ambient temperature, which can significantly optimize energy consumption; and the control strategy can intelligently adapt to changes in ambient temperature. When the ambient temperature exceeds the preset range, the power of the compressor and the PTC heater is not limited to ensure that the vehicle can cope with extreme weather conditions such as severe cold or heat. This intelligent adaptability helps to improve the reliability and stability of the vehicle.

[0085] In this embodiment S2, when the temperature of key components of the electric vehicle, such as the battery, motor, motor controller and charging and distribution system, is too high, the grille and electronic fan are promptly closed by the vehicle thermal management controller, and the compressor power and PTC heater power are limited, which can effectively reduce the temperature of these components and prevent performance degradation, damage or even safety accidents caused by overheating.

[0086] Overall, this application has the following beneficial effects:

[0087] Since electric vehicles need to overcome greater air resistance and rolling resistance when driving at high speeds, the energy consumption of electric vehicles is usually higher when driving at high speeds; by judging whether the electric vehicle is in a high-speed driving state, energy-saving measures can be taken more specifically, that is, the thermal management system and heat dissipation system components are adjusted only when the electric vehicle is driving at high speeds, which can avoid unnecessary energy consumption increases. When the electric vehicle is driving at high speeds and the temperature of the target components is too high, the heat dissipation system components may over-operate and consume a lot of electricity. By shutting down these components through the vehicle thermal management controller, unnecessary energy consumption can be significantly reduced. At the same time, the operation of the air-conditioning system will also increase the electric vehicle's energy loss. When driving at high speeds and energy consumption needs to be reduced, limiting the power of the thermal management system through the air-conditioning controller can reduce the energy consumption of the air-conditioning system, thereby further reducing the total energy consumption of the electric vehicle;

[0088] This application starts from the user's actual vehicle usage scenarios and optimizes the thermal management control logic. On the basis of ensuring that the power battery and other vehicle components operate within a reasonable temperature range, it reduces high-speed endurance attenuation and reduces the user's mileage anxiety.

[0089] Embodiment 2:

[0090] See also Figure 4 , an embodiment of the present application provides a thermal management control device for high-speed driving of an electric vehicle, comprising a data module 10 and a control module 20;

[0091] Wherein, the data module 10 is used to obtain vehicle status data of the electric vehicle;

[0092] The control module 20 is used to reduce the power loss of the electric vehicle by shutting down the cooling system components of the electric vehicle through the vehicle thermal management controller and limiting the thermal management system power of the electric vehicle through the air-conditioning controller based on the vehicle status data when the electric vehicle is in a preset high-speed driving state if the temperature of several target components in the electric vehicle exceeds a preset value.

[0093] In one embodiment, the data module 10 is specifically:

[0094] The vehicle control unit (VCU) is used to monitor the speed signal and running status of the electric vehicle in real time to obtain vehicle status data.

[0095] In one embodiment, the control module 20 includes a judgment unit, a closing subunit, a holding subunit, a temperature subunit, a limit-holding subunit and a limit-maintaining subunit, specifically:

[0096] The judgment unit is used to obtain the speed of the electric vehicle from the vehicle status data. If the speed is greater than a preset value (such as 90 km / h) and lasts for more than a preset time (such as 10 minutes), the electric vehicle is in a high-speed driving state.

[0097] In the judgment unit of this embodiment, the energy consumption of an electric vehicle is relatively high when it is running at a high speed. By judging whether the electric vehicle is in a high-speed running state, the energy consumption can be managed more accurately to avoid unnecessary energy waste.

[0098] The shutdown subunit is used to determine whether the temperature of several target components in the electric vehicle exceeds the corresponding preset value through the vehicle thermal management controller (Temperature Management Module for Entire Vehicle, TMM) when the electric vehicle is in a high-speed driving state; wherein the several target components include batteries, motors, motor controllers and charging and distribution systems.

[0099] The shut-down subunit is also used to shut down all grilles and electronic fans of the electric vehicle through the vehicle thermal management controller if the temperatures of the target components do not exceed the corresponding preset values, so as to reduce the power loss of the electric vehicle;

[0100] The maintaining subunit is used to maintain the current opening state of the grille and the current state of the electronic fan in the electric vehicle if any temperature of the target components exceeds the corresponding preset value.

[0101] It should be noted that the control strategy of the above active air intake grille is switch control, and it can also be a more complex control strategy, such as neural network control, etc., the purpose of which is to find the optimal opening of the air intake grille.

[0102] In the closing subunit and the maintaining subunit of this embodiment, when the temperature of the target component does not exceed the preset value, closing all grilles and electronic fans of the electric vehicle can reduce unnecessary energy consumption; wherein, closing the grilles helps to reduce wind resistance, thereby reducing the energy consumption of the electric vehicle during driving, and closing the electronic fans also avoids the power consumption caused by excessive heat dissipation. When the temperature of the target component exceeds the preset value, maintaining the current state of the grilles and electronic fans can ensure that the thermal management system of the electric vehicle can effectively dissipate heat and prevent components from overheating, thereby protecting the performance and safety of the electric vehicle;

[0103] In addition, by judging whether the temperature of several target components is over-temperature, the decision is made to close the grille or maintain the current grille opening. The purpose is to close as many grilles as possible to reduce high-speed wind resistance, thereby reducing the energy consumption used to overcome high-speed wind resistance. Generally speaking, at high speeds, the wind speed flowing through the radiator is relatively high, and when it can meet the cooling requirements of the radiator, the fan can be turned off while driving.

[0104] A temperature subunit, used to obtain the ambient temperature of the electric vehicle from the vehicle status data;

[0105] The limiting-maintaining subunit is used to limit the power of the compressor to a preset maximum value through the air-conditioner controller (AC) according to the ambient temperature when the defrost and defog functions of the electric vehicle are not turned on. If the ambient temperature is within a preset range, the power of the compressor is limited to within a preset maximum value according to the ambient temperature, so as to reduce the power loss of the electric vehicle; if the ambient temperature is not within the preset range, the compressor power is not limited.

[0106] Taking a Class A car as an example, the maximum power of the electric air-conditioning compressor is 3500W. When driving at high speed, the air-conditioning controller sets different gradients for the air-conditioning compressor power according to the ambient temperature to limit the power, as follows:

[0107] ①When the ambient temperature is less than 0℃, the compressor power is not limited;

[0108] ②When the ambient temperature is ≥0℃ and <5℃, the maximum value of the compressor power is set to 2500W;

[0109] ③When the ambient temperature is ≥5℃ and <20℃, the maximum value of the compressor power is set to 1500W;

[0110] ④When the ambient temperature is ≥20℃ and <30℃, the maximum value of the compressor power is set to 1000W;

[0111] ⑤When the ambient temperature is ≥30℃ and <35℃, the maximum value of the compressor power is limited to 1500W;

[0112] ⑥When the ambient temperature is ≥35℃ and <40℃, the maximum value of the compressor power is set to 2500W;

[0113] ⑦ When the ambient temperature is ≥40℃, the compressor power is not limited.

[0114] The limiting-maintaining subunit is used to limit the power of the PTC (Positive Temperature Coefficient) heater to a preset maximum value through the air-conditioning controller according to the ambient temperature when the defrost and defog functions of the electric vehicle are not turned on. This reduces the power loss of the electric vehicle. If the ambient temperature is not within the preset range, the power of the PTC heater is not limited.

[0115] Taking a Class A car as an example, the maximum power of the PTC heater is 5000W. When driving at high speed, the air conditioning controller sets different gradients for the PTC heater power according to the ambient temperature to limit the power, as follows:

[0116] ①When the ambient temperature is less than -10℃, the PTC power is not limited;

[0117] ②When the ambient temperature is ≥-10℃ and <0℃, the maximum value of the PTC power limit is set to 3500W;

[0118] ③When the ambient temperature is ≥0℃ and <5℃, the maximum value of the PTC power is limited to 2500W;

[0119] ④When the ambient temperature is ≥5℃ and <15℃, the maximum value of the PTC power limit is set to 2000W;

[0120] ⑤When the ambient temperature is ≥15℃ and <25℃, the maximum value of the PTC power limit is set to 1500W;

[0121] ⑥When the ambient temperature is ≥25℃, the maximum value of the PTC power is limited to 1000W.

[0122] To apply the embodiments of this application, please refer to Figure 2 , Figure 2 It is a control flow chart provided in an embodiment of the present application, which shows the general process of performing thermal management of the whole vehicle by controlling the grille, electronic fan, compressor power and PTC heater power, thereby reducing the power loss of the electric vehicle.

[0123] To apply the embodiments of this application, please refer to Figure 3 , Figure 3 is a comparison diagram of the range attenuation rate distribution provided in an embodiment of the present application, showing the range attenuation rate distribution before and after the thermal management control strategy of the electric vehicle is optimized;

[0124] Figure 3 Taking a certain A-class car as an example, the distribution of the range attenuation rate of 1,920 cars under high-speed conditions (vehicle speed ≥ 90km / h) was analyzed before and after the thermal management control strategy was optimized. After the thermal management control strategy was optimized, the range attenuation rate of nearly 70% of users decreased by 5% to 7%, and the range attenuation rate of 30% of users increased, which may be related to intense driving and ultra-high-speed (>120km / h) driving.

[0125] The temperature subunit, the limit-hold subunit and the limit-maintain subunit of the present embodiment limit the power of the compressor and the PTC heater according to the ambient temperature when the defrost and defog functions of the electric vehicle are not turned on, which can significantly optimize energy consumption; and the control strategy can intelligently adapt to changes in ambient temperature. When the ambient temperature exceeds the preset range, the power of the compressor and the PTC heater is not limited to ensure that the vehicle can cope with extreme weather conditions such as severe cold or heat. This intelligent adaptability helps to improve the reliability and stability of the vehicle.

[0126] In the control module 20 of this embodiment, when the temperature of key components of the electric vehicle, such as the battery, motor, motor controller and charging and distribution system, is too high, the grille and electronic fan are promptly closed by the vehicle thermal management controller, and the compressor power and PTC heater power are limited, which can effectively reduce the temperature of these components and prevent performance degradation, damage or even safety accidents caused by overheating.

[0127] Overall, this application has the following beneficial effects:

[0128] Since electric vehicles need to overcome greater air resistance and rolling resistance when driving at high speeds, the energy consumption of electric vehicles is usually higher when driving at high speeds; by judging whether the electric vehicle is in a high-speed driving state, energy-saving measures can be taken more specifically, that is, the thermal management system and heat dissipation system components are adjusted only when the electric vehicle is driving at high speeds, which can avoid unnecessary energy consumption increases. When the electric vehicle is driving at high speeds and the temperature of the target components is too high, the heat dissipation system components may over-operate and consume a lot of electricity. By shutting down these components through the vehicle thermal management controller, unnecessary energy consumption can be significantly reduced. At the same time, the operation of the air-conditioning system will also increase the electric vehicle's energy loss. When driving at high speeds and energy consumption needs to be reduced, limiting the power of the thermal management system through the air-conditioning controller can reduce the energy consumption of the air-conditioning system, thereby further reducing the total energy consumption of the electric vehicle;

[0129] This application starts from the user's actual vehicle usage scenarios and optimizes the thermal management control logic. On the basis of ensuring that the power battery and other vehicle components operate within a reasonable temperature range, it reduces high-speed endurance attenuation and reduces the user's mileage anxiety.

[0130] Embodiment three:

[0131] The embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for controlling thermal management of electric vehicle high-speed driving;

[0132] Wherein, the electric vehicle high-speed driving thermal management control method, if implemented in the form of a software functional unit and used as an independent product, can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0133] The above are preferred embodiments of the present invention. It should be noted that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A thermal management control method for electric vehicles running at high speeds, characterized in that: include: Obtain vehicle status data of electric vehicles; Based on the vehicle status data, when the electric vehicle is in a preset high-speed driving state, if the temperature of several target components in the electric vehicle exceeds preset values, the cooling system components of the electric vehicle are shut down through the vehicle thermal management controller, and the thermal management system power of the electric vehicle is limited through the air-conditioning controller to reduce the power loss of the electric vehicle.

2. The electric vehicle high-speed thermal management control method according to claim 1, characterized in that: If the temperature of several target components in the electric vehicle exceeds a preset value, the cooling system components of the electric vehicle are turned off by the vehicle thermal management controller, and the thermal management system power of the electric vehicle is limited by the air conditioning controller to reduce the power loss of the electric vehicle, specifically: If the temperature of the target components in the electric vehicle exceeds a preset value, the grille and the electronic fan of the electric vehicle are turned off by the vehicle thermal management controller, and the compressor power and the PTC heater power of the electric vehicle are limited by the air conditioning controller to reduce the power loss of the electric vehicle; Among them, the several target components include batteries, motors, motor controllers and charging and distribution systems.

3. The electric vehicle high-speed thermal management control method as claimed in claim 2, characterized in that: The grille and the electronic fan of the electric vehicle are turned off by the vehicle thermal management controller, specifically: If the temperatures of the target components do not exceed the corresponding preset values, all grilles and electronic fans of the electric vehicle are turned off by the vehicle thermal management controller; If any temperature of the target components exceeds a corresponding preset value, the current opening state of the grille and the current state of the electronic fan in the electric vehicle are maintained.

4. The electric vehicle high-speed thermal management control method as claimed in claim 2, characterized in that: The compressor power and the PTC heater power of the electric vehicle are limited by the air conditioning controller, specifically: Acquiring the ambient temperature of the electric vehicle from the vehicle status data; When the electric vehicle does not turn on the defrosting and defogging function, if the ambient temperature is within a preset range, the compressor power and the PTC heater power are limited to within a preset maximum value through the air-conditioning controller according to the ambient temperature; If the ambient temperature is not within the preset range, the compressor power and the PTC heater power are not limited.

5. The electric vehicle high-speed thermal management control method according to claim 1, characterized in that: When the electric vehicle is in a preset high-speed driving state, specifically: The speed of the electric vehicle is obtained from the vehicle status data. If the speed is greater than a preset value and lasts for more than a preset time, the electric vehicle is in the high-speed driving state.

6. A thermal management control device for electric vehicles running at high speeds, characterized in that: Includes data module and control module; Wherein, the data module is used to obtain vehicle status data of the electric vehicle; The control module is used to reduce the power loss of the electric vehicle by shutting down the cooling system components of the electric vehicle through the vehicle thermal management controller and limiting the thermal management system power of the electric vehicle through the air-conditioning controller based on the vehicle status data when the electric vehicle is in a preset high-speed driving state if the temperature of several target components in the electric vehicle exceeds preset values.

7. The electric vehicle high-speed thermal management control device as claimed in claim 6, characterized in that: The control module includes a control unit; Wherein, the control unit is used to reduce the power loss of the electric vehicle by closing the grille and the electronic fan of the electric vehicle through the vehicle thermal management controller and limiting the compressor power and the PTC heater power of the electric vehicle through the air conditioning controller if the temperature of the several target components in the electric vehicle exceeds a preset value; Among them, the several target components include batteries, motors, motor controllers and charging and distribution systems.

8. The electric vehicle high-speed thermal management control device as claimed in claim 7, characterized in that: The control unit includes a closing subunit and a holding subunit; Wherein, the closing subunit is used to close all grilles and electronic fans of the electric vehicle through the vehicle thermal management controller if the temperatures of the several target components do not exceed the corresponding preset values; The maintaining subunit is used to maintain the current opening state of the grille and the current state of the electronic fan in the electric vehicle if any temperature of the several target components exceeds the corresponding preset value.

9. The electric vehicle high-speed thermal management control device as claimed in claim 7, characterized in that: The control unit includes a temperature subunit, a limiting subunit and a maintaining subunit; Wherein, the temperature subunit is used to obtain the ambient temperature of the electric vehicle from the vehicle status data; The limiting subunit is used for limiting the compressor power and the PTC heater power within a preset maximum value through the air-conditioning controller according to the high and low ambient temperature when the defrosting and defogging functions of the electric vehicle are not turned on and if the ambient temperature is within a preset range; The maintaining subunit is used for not limiting the compressor power and the PTC heater power if the ambient temperature is not within the preset range.

10. The electric vehicle high-speed thermal management control method according to claim 6, characterized in that: When the electric vehicle is in a preset high-speed driving state, specifically: The speed of the electric vehicle is obtained from the vehicle status data. If the speed is greater than a preset value and lasts for more than a preset time, the electric vehicle is in the high-speed driving state.

11. A storage medium, characterized in that: The storage medium stores a computer program, which is called and executed by a computer to implement a thermal management control method for high-speed driving of an electric vehicle as described in any one of claims 1 to 5 above.

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