Electric vehicle and thermal management control method, device and storage medium thereof

Abstract

The application discloses an electric vehicle and a heat management control method and device thereof and a storage medium. The heat management control method of the electric vehicle comprises the following steps: acquiring power battery information and remaining available power of the electric vehicle, and acquiring a cab temperature of the electric vehicle, wherein the power battery information comprises a power battery temperature and a power battery capacity; when it is determined that the power battery discharge capacity meets preset requirements according to the remaining available power of the electric vehicle and the power battery capacity, performing power limiting control on a PTC heater of the electric vehicle, and distributing the heating power of the PTC heater according to the cab temperature and the power battery temperature. Therefore, the heat management control method of the electric vehicle distributes the heating power of the PTC heater according to the cab temperature and the power battery temperature, ensures that the power battery can be normally charged and driven in a low-temperature environment and the cab temperature will not be too low, and improves the driving safety of the electric vehicle and the use experience of a user.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to an electric vehicle and its thermal management control method, device and storage medium. Background Technology

[0002] In the thermal management technology of new energy electric vehicles, whether the driver's cab needs heating or the battery needs heating, the heating demand is met by a PTC (Positive Temperature Coefficient) heater. The required power of the PTC heater is determined by assessing the magnitude of the heating demand, thus satisfying the user's heating needs.

[0003] In related technologies, in new energy liquid-cooled plug-in hybrid vehicles, when the temperature is low and the battery is low in winter, the engine charges the battery. Because the interior temperature of the cab is low, the cab needs heating, so the air conditioner turns on the PTC heater to heat the cab. However, the battery temperature is also low at this time, and the battery also needs the air conditioner's PTC heater to heat the battery. If the battery charge is not high to begin with, and the battery charging efficiency is low at low temperatures, the power required by the PTC heater may be too high, causing the battery charge to decrease further and further. In such cases, the vehicle cannot charge the battery while driving, which leads to the battery not being able to be used normally and the vehicle not being able to drive normally, greatly reducing the user experience. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide a thermal management control method for electric vehicles. This method allocates the heating power of the PTC heater according to the cab temperature and the power battery temperature, ensuring that the power battery can charge normally during driving in low-temperature environments and that the cab temperature does not become too low, thereby improving the driving safety of electric vehicles and the user experience.

[0005] A second objective of this invention is to provide a computer-readable storage medium.

[0006] The third objective of this invention is to provide a thermal management control device for electric vehicles.

[0007] The fourth objective of this invention is to provide an electric vehicle.

[0008] To achieve the above objectives, a first aspect of the present invention provides a thermal management control method for an electric vehicle. The thermal management control method includes: acquiring information about the electric vehicle's power battery and the remaining available power of the vehicle, and acquiring the temperature of the electric vehicle's cab, wherein the power battery information includes the power battery temperature and the power battery charge; when it is determined, based on the remaining available power of the vehicle and the power battery charge, that the power battery's discharge capacity meets preset requirements, performing power limiting control on the electric vehicle's PTC heater, and allocating the heating power of the PTC heater according to the cab temperature and the power battery temperature.

[0009] The thermal management control method for electric vehicles according to this invention first acquires information about the electric vehicle's power battery, the vehicle's cab temperature, and the remaining available power of the entire vehicle. The power battery information includes the power battery temperature and charge level. Then, based on the remaining available power and the power battery charge level, it determines whether the power battery's discharge capacity meets preset requirements. If the power battery's discharge capacity meets the preset requirements, power limiting control is applied to the electric vehicle's PTC heater, and the heating power of the PTC heater is allocated according to the cab temperature and the power battery temperature. Therefore, the thermal management control method for electric vehicles according to this invention allocates the heating power of the PTC heater based on the cab temperature and the power battery temperature, ensuring that the power battery can charge normally during driving in low-temperature environments and that the cab temperature does not become excessively low, thereby improving the driving safety of the electric vehicle and the user experience.

[0010] In some embodiments of the present invention, determining that the power battery discharge capacity meets the preset requirements based on the remaining available power of the vehicle and the power battery charge includes: determining that the power battery discharge capacity meets the preset requirements when the remaining available power of the vehicle is less than a first preset power or the power battery charge is less than a first preset charge threshold.

[0011] In some embodiments of the present invention, when limiting the power of the PTC heater of the electric vehicle, the method further includes: if the remaining available power of the vehicle is less than a second preset power or the power battery charge is less than a second preset charge threshold, then the PTC heater is prohibited from working, wherein the second preset power is less than the first preset power and the second preset charge threshold is less than the first preset charge threshold.

[0012] In some embodiments of the present invention, before determining that the discharge capacity of the power battery meets the preset requirements, the method further includes: determining correction parameters; and correcting the remaining available power of the vehicle and / or the power battery charge according to the correction parameters.

[0013] In some embodiments of the present invention, the correction parameters are determined based on at least one of the following: altitude, slope, driving mode, speed, and battery temperature of the electric vehicle's current driving environment.

[0014] In some embodiments of the present invention, the heating power of the PTC heater is distributed according to the cab temperature and the power battery temperature, including: determining the proportional valve opening of the PTC heater according to the cab temperature and the power battery temperature; and controlling the PTC heater to distribute heating power to the cab and power battery of the electric vehicle according to the proportional valve opening.

[0015] In some embodiments of the present invention, determining the proportional valve opening of the PTC heater based on the cab temperature and the power battery temperature includes: when the cab temperature is greater than a first preset temperature, determining the proportional valve opening to be the opening corresponding to when the proportional valve is fully closed, so that the PTC heater only heats the power battery; when the cab temperature is less than a second preset temperature, determining the proportional valve opening to be the opening corresponding to when the proportional valve is fully open, so that the PTC heater only heats the cab, wherein the second preset temperature is less than the first preset temperature.

[0016] In some embodiments of the present invention, when the cab temperature is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, the opening degree of the proportional valve is calculated according to the following formula: x = C1*(T1-T) + (tT)*C2. Wherein, x represents the opening degree of the proportional valve for heating the cab, T1 represents the first preset temperature, T represents the cab temperature, t represents the power battery temperature, and C1 and C2 represent preset constants.

[0017] In some embodiments of the present invention, the method further includes: when the power battery reaches a first preset target temperature and the heating power of the PTC heater is greater than zero, controlling the proportional valve to be in the fully open state so that the PTC heater heats only the cab; and when the cab reaches a second preset target temperature and the heating power of the PTC heater is greater than zero, controlling the proportional valve to be in the fully closed state so that the PTC heater heats only the power battery.

[0018] To achieve the above objectives, a second aspect of the present invention provides a computer-readable storage medium storing a thermal management control program for an electric vehicle, which, when executed by a processor, implements the thermal management control method for the electric vehicle described in the above embodiment.

[0019] The computer-readable storage medium of this embodiment executes the thermal management control program of the electric vehicle of the embodiment stored thereon through a processor. It can allocate the heating power of the PTC heater according to the temperature of the cab and the temperature of the power battery, so as to ensure that the power battery can be charged normally in low temperature environment and that the temperature of the cab will not be too low, thereby improving the driving safety of the electric vehicle and the user experience.

[0020] To achieve the above objectives, a third aspect of the present invention provides a thermal management control device for an electric vehicle. The device includes: an acquisition module, configured to acquire the power battery information and the remaining available power of the electric vehicle, and acquire the cab temperature of the electric vehicle, wherein the power battery information includes the power battery temperature and the power battery charge; and a control module, configured to limit the power of the PTC heater of the electric vehicle when it is determined, based on the remaining available power of the vehicle and the power battery charge, that the power battery discharge capacity meets a preset requirement, and to allocate the heating power of the PTC heater according to the cab temperature and the power battery temperature.

[0021] The thermal management control device for electric vehicles according to this invention includes an acquisition module and a control module. First, the acquisition module acquires information about the electric vehicle's power battery, the remaining available power of the vehicle, and the passenger compartment temperature. Then, the control module determines, based on the remaining available power and the power battery charge level in the power battery information, that the power battery's discharge capacity meets preset requirements. If this condition is met, the control module limits the power of the PTC heater in the electric vehicle and allocates the heating power of the PTC heater according to the passenger compartment temperature and the power battery temperature in the power battery information. Thus, the thermal management control device for electric vehicles according to this invention allocates the heating power of the PTC heater based on the passenger compartment temperature and the power battery temperature, ensuring that the power battery can charge normally during driving in low-temperature environments and that the passenger compartment temperature does not become excessively low, thereby improving the driving safety of the electric vehicle and the user experience.

[0022] To achieve the above objectives, a fourth aspect of the present invention provides an electric vehicle including the thermal management control device for the electric vehicle described in the above embodiments.

[0023] The electric vehicle of this invention includes the thermal management control device of the electric vehicle in the above embodiments, which can distribute the heating power of the PTC heater according to the temperature of the cab and the temperature of the power battery, so as to ensure that the power battery can be charged normally in low temperature environment and that the temperature of the cab will not be too low, thereby improving the driving safety of the electric vehicle and the user experience.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is a flowchart of a thermal management control method for an electric vehicle according to an embodiment of the present invention;

[0026] Figure 2 This is a flowchart of a thermal management control method for an electric vehicle according to an embodiment of the present invention;

[0027] Figure 3 This is a flowchart of a thermal management control method for an electric vehicle according to an embodiment of the present invention;

[0028] Figure 4 This is a flowchart of a thermal management control method for an electric vehicle according to an embodiment of the present invention;

[0029] Figure 5 This is a structural block diagram of a thermal management control device for an electric vehicle according to an embodiment of the present invention;

[0030] Figure 6 This is a structural block diagram of an electric vehicle according to an embodiment of the present invention. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] The electric vehicle and its thermal management control method, device and storage medium according to embodiments of the present invention are described below with reference to the accompanying drawings.

[0033] Figure 1 This is a flowchart of a thermal management control method for an electric vehicle according to an embodiment of the present invention.

[0034] like Figure 1 As shown in the figure, this invention proposes a flowchart of a thermal management control method for electric vehicles, which includes the following steps:

[0035] S10 obtains the power battery information and remaining available power of the electric vehicle, and obtains the cab temperature of the electric vehicle. The power battery information includes the power battery temperature and the power battery charge.

[0036] Specifically, this embodiment can employ various methods to acquire information about the electric vehicle's power battery. This information includes the battery temperature and charge level, including but not limited to directly acquiring the battery's current temperature using a temperature sensor, acquiring the battery voltage using a voltage sensor, and obtaining the charge level through table lookup or calculation. It is understood that temperature is a crucial factor affecting battery charge; the battery pack's capacity varies at different temperatures, and the selection and correction of temperature ranges directly impact battery performance and usable charge. For example, to acquire the open-circuit voltage of a lithium battery, since there is a clear and monotonic correspondence between the open-circuit voltage and the battery's charge level, the correspondence between open-circuit voltage values ​​at different temperatures and different SOCs (State of Charge) is first measured offline and stored in tabular form. It should be noted that the battery SOC reflects the battery's remaining capacity, numerically defined as the ratio of remaining capacity to total battery capacity, commonly expressed as a percentage. Its range is 0% to 100%, where SOC = 0% indicates the battery is fully discharged, and SOC = 100% indicates the battery is fully charged. Understandably, in one example, after the battery system is installed in the vehicle, the corresponding battery capacity can be obtained by looking up the open-circuit voltage and then using a table.

[0037] It should be noted that there are many ways to obtain power battery information in this embodiment. The specific method of obtaining power battery information is not limited, as long as the power battery charge and temperature can be accurately obtained. Of course, the method of obtaining information can be selected adaptively according to the specific application scenario of the vehicle.

[0038] Furthermore, the remaining usable power of the vehicle refers to the available power remaining after the power battery has supplied power to the vehicle to ensure normal operation. This remaining usable power can be used to perform additional functions of the vehicle, such as air conditioning in the cab and temperature regulation of the power battery. This embodiment can directly obtain the remaining usable power of the electric vehicle through a power acquisition device, or indirectly obtain it by acquiring voltage and current and performing calculations. It should be noted that this embodiment only illustrates some methods for obtaining the remaining usable power of the vehicle and does not specifically limit it. The method for obtaining the remaining usable power of the vehicle can be adaptively selected based on factors such as vehicle model, battery type, and vehicle condition.

[0039] Furthermore, to obtain the temperature of the electric vehicle's cab, this embodiment can use sensors to acquire the real-time temperature of the space where the driver is located. For example, the vehicle's cab is equipped with a temperature sensor device to sense the temperature inside the vehicle, and the sensor signal processing circuit processes it into a digital signal and transmits it to the vehicle control unit, thereby accurately sensing the temperature of the electric vehicle's cab.

[0040] S20, when it is determined that the discharge capacity of the power battery meets the preset requirements based on the remaining available power of the vehicle and the power battery charge, performs power limiting control on the PTC heater of the electric vehicle, and distributes the heating power of the PTC heater according to the cab temperature and the power battery temperature.

[0041] Specifically, after obtaining the remaining available power of the vehicle and the power battery charge, the remaining available power of the vehicle and the power battery charge are then assessed to determine whether the power battery discharge capacity meets preset requirements. In some embodiments of the present invention, the power battery discharge capacity is determined to meet preset requirements based on the remaining available power of the vehicle and the power battery charge, such as... Figure 2 As shown, the process includes the following steps: S201, when the remaining available power of the vehicle is less than the first preset power or the power battery charge is less than the first preset charge threshold, it is determined that the power battery discharge capacity meets the preset requirements.

[0042] After the available power of the power battery supplies the motor and vehicle accessories, the remaining power is the vehicle's remaining available power. This invention uses the vehicle's remaining available power as a reference. When the vehicle's remaining available power is lower than a first preset power threshold, the PTC heater needs to be power-limited to reduce battery power consumption and prioritize ensuring that the vehicle's power performance, i.e., the motor's power consumption, is not affected. The vehicle's remaining available power is calculated using the power formula P=UI, with units of watts (W), for example: 1W=1A×1V. It should be noted that battery capacity represents the amount of electricity the battery can discharge under certain conditions (discharge rate, temperature, termination voltage), generally expressed in ampere-hours (AH). The vehicle's remaining available power can be determined based on the power battery's current and voltage at that time and is an important indicator of the power battery's discharge capacity. When the vehicle's remaining available power is less than the first preset power or the power battery's charge is less than the first preset charge threshold, it is determined that the power battery's discharge capacity meets the preset requirements. Power-limiting control is then applied to the electric vehicle's PTC heater, and the heating power of the PTC heater is allocated according to the cab temperature and the power battery temperature.

[0043] For example, the first preset power can be set to 15kW, and the first preset battery capacity threshold can be 35%. This means that when the remaining available power of the vehicle is less than 15kW, or the battery SOC is less than 35%, the remaining available power of the vehicle or the SOC of the power battery is low. If the power required by the PTC heater is too high, the battery capacity may decrease further, preventing the battery from being charged while driving. Therefore, to ensure the efficiency of the engine charging the battery during vehicle operation, the remaining available power of the vehicle and the battery capacity should be considered, and the available power of the PTC heater should be limited accordingly. Furthermore, different controls should be applied to the PTC heater of the electric vehicle under different temperatures.

[0044] In some embodiments of the present invention, when limiting the power of the PTC heater of an electric vehicle, the method further includes: if the remaining available power of the vehicle is less than a second preset power or the power battery charge is less than a second preset charge threshold, then the PTC heater is prohibited from working, wherein the second preset power is less than a first preset power and the second preset charge threshold is less than a first preset charge threshold.

[0045] Specifically, when the remaining available power of the vehicle is less than a second preset power or the battery charge is less than a second preset charge threshold, the PTC heater is prohibited from operating to ensure the efficiency of the engine charging the battery during vehicle operation and to restore the vehicle's charge to normal as quickly as possible. The second preset power is less than the first preset power, and the second preset charge threshold is less than the first preset charge threshold. For example, the second preset power can be set to 2kW, and the second preset charge threshold can be 10%. That is, when the remaining available power of the vehicle is less than 2kW, or the battery SOC is less than 10%, the PTC heater is prohibited from operating to ensure that all the heating power of the PTC heater is allocated to charging the battery during vehicle operation and to restore it to normal as quickly as possible.

[0046] It should be noted that the first preset power, the second preset power, the first preset power threshold, and the second preset power threshold in the above embodiments can all be determined based on information such as the battery capacity and charging efficiency of the electric vehicle. The specific values ​​of each preset value are only illustrative examples and are not specifically limited thereto.

[0047] In some embodiments of the present invention, before determining that the discharge capacity of the power battery meets the preset requirements, such as Figure 3 As shown, it includes the following steps:

[0048] S301, Determine the correction parameters.

[0049] S302, adjusts the remaining available power of the vehicle and / or the power battery capacity according to the correction parameters.

[0050] Specifically, in this embodiment, the correction parameter is determined based on at least one of the following: altitude, slope, driving mode, speed, and battery temperature of the electric vehicle's current driving environment.

[0051] Specifically, when limiting or disabling the PTC heater based on the vehicle's remaining available power and battery SOC, to ensure accurate control of the PTC heater, the vehicle's remaining available power and battery SOC can be corrected. The correction parameters can be formulated based on the main factors affecting the available power and battery SOC. In this embodiment, the available power and battery SOC should consider corrections for factors such as vehicle altitude, gradient, vehicle speed, driving mode, and battery temperature. For example, the vehicle's remaining available power and / or battery charge = initial value + altitude correction factor + gradient correction factor + vehicle speed correction factor + driving mode correction factor + battery temperature correction factor.

[0052] Taking the slope correction factor as an example, this embodiment can pre-determine the relationship between slope and correction factor under the condition that other factors are constant during the experiment, and store it in tabular form. During the climbing process, the corresponding correction factor can be obtained according to the slope by looking up the table, and then the remaining available power of the vehicle and / or the power battery charge can be corrected according to the correction factor. As shown in Table 1, the larger the slope, the larger the correction factor; when the slope is constant, the correction factor remains unchanged.

[0053] Table 1

[0054] slope -15 -10 -5 -2 2.5 5 7.5 10 15 20 Correction factor 0 0 0 0 0 1 1.5 2 2 2

[0055] In some embodiments of the present invention, the heating power of the PTC heater is allocated according to the cab temperature and the power battery temperature, such as... Figure 4 As shown, it includes the following steps:

[0056] S401, determine the opening degree of the proportional valve of the PTC heater based on the cab temperature and the power battery temperature.

[0057] S402 controls the PTC heater to distribute heating power to the driver's cab and power battery of the electric vehicle according to the opening degree of the proportional valve.

[0058] Specifically, after determining that the power battery's discharge capacity meets preset requirements based on the corrected power battery temperature and charge level, the power of the electric vehicle's PTC heater is limited. The power allocation ratio of the PTC heater is determined based on the current temperature of the cab and the battery temperature, and can be controlled via a proportional valve. For example, when the cab temperature is high, the PTC heater prioritizes heating the battery; when both the cab and battery temperatures are low, both are heated simultaneously, but to ensure overall vehicle power output, the battery receives a higher proportion of heating power; when the cab temperature is even lower, the cab is prioritized for heating to ensure passenger safety.

[0059] In some embodiments of the present invention, the opening degree of the proportional valve of the PTC heater is determined based on the cab temperature and the power battery temperature. When the cab temperature is higher than a first preset temperature, the proportional valve opening degree is determined to be the opening degree corresponding to the proportional valve being fully closed, so that the PTC heater heats the power battery. When the cab temperature is lower than a second preset temperature, the proportional valve opening degree is determined to be the opening degree corresponding to the proportional valve being fully open, so that the PTC heater heats the cab, and the second preset temperature is lower than the first preset temperature.

[0060] Specifically, when only the battery or the cab needs heating, there is no need to consider the heating priority. The PTC heater can be directly controlled to heat only the battery or the cab. However, when both the battery and the cab request heating at the same time, in order to improve the driving safety of electric vehicles and the safety and user experience, the proportional valve opening of the PTC heater needs to be determined according to the heating priority based on different operating conditions.

[0061] It should be noted that when a proportional valve is used for a long time or malfunctions and becomes partially blocked, the current fully open position of the proportional valve will not be the same as its original fully open position. The current fully open position should be less than or equal to the original fully open position. For example, if a portion of the proportional valve is blocked, causing the fully open position to be only 80% of its original position, then in this case, if only cab heating is required, and the proportional valve is kept fully open, the corresponding opening will be 80%. It should be noted that under normal circumstances, the fully open position of the proportional valve corresponds to 100%, and the fully closed position corresponds to 0%.

[0062] For example, in this example, the first preset temperature is set to 5℃. When the cab temperature is greater than 5℃, it means that the cab does not need heating or the urgency of heating is not high. In this case, the PTC heater prioritizes heating the battery, and the proportional valve opening is controlled at 0%, indicating that the proportional valve is fully closed, and the heating power of the PTC heater is first allocated to battery heating. In this example, the second preset temperature is set to -20℃. When the cab temperature is less than -20℃, if the cab is not heated in time, it could lead to the driver's life safety. To ensure the safety of passengers in the cab, the PTC heater prioritizes heating the cab, and the proportional valve opening is controlled at 100%, indicating that the proportional valve is fully open, and the heating power of the PTC heater is first allocated to cab heating. When the cab temperature is between -20℃ and 5℃, the needs of both the cab and the battery should be considered. By controlling the opening of the proportional valve, the heating heat allocated by the PTC heater to the cab and the battery is controlled.

[0063] In some embodiments of the present invention, when the cab temperature is less than or equal to a first preset temperature and greater than or equal to a second preset temperature, the opening degree of the proportional valve is calculated according to the following formula: x = C1*(T1-T) + (tT)*C2. Wherein, x represents the opening degree of the proportional valve for heating the cab, T1 represents the first preset temperature, T represents the cab temperature, t represents the power battery temperature, and C1 and C2 represent preset constants.

[0064] For example, when the first preset temperature is set to 5℃ and the second preset temperature is set to -20℃, and the cab temperature is between -20℃ and 5℃, the proportional valve opening is calculated by substituting the real-time cab temperature T and the power battery temperature t into the proportional valve opening formula x = 4*(5-T) + (tT)*10. It should be noted that the preset constants C1 and C2 can be obtained through experimental analysis and may differ under different operating conditions or vehicle models. It should also be noted that in the proportional valve opening calculation formula, (tT)*C2 is a correction for the opening. If the temperature difference between the battery and the cab is significant, the proportional valve opening is corrected accordingly. Furthermore, when the calculated proportional valve opening is greater than 100, it is treated as 100, meaning only the cab is heated; when it is less than 0, it is treated as 0, meaning only the power battery is heated.

[0065] In some embodiments of the present invention, when the power battery reaches a first preset target temperature and the heating power of the PTC heater is greater than zero, the proportional valve is controlled to be fully open so that the PTC heater heats only the cab; when the cab reaches a second preset target temperature and the heating power of the PTC heater is greater than zero, the proportional valve is controlled to be fully closed so that the PTC heater heats only the power battery.

[0066] Specifically, by controlling the opening degree of the proportional valve, the amount of heat supplied to the battery in the pipeline is controlled, thus achieving temperature regulation. When the cab temperature is high, the available power of the PTC heater is prioritized for heating the power battery. Furthermore, if the PTC heater still has remaining power after the power battery has reached the first preset target temperature, then the remaining power can be used to heat the cab. Specifically, the proportional valve is controlled to be fully open so that the PTC heater can utilize the remaining power to heat the cab. When the cab temperature is too low, priority is given to heating the cab to ensure passenger safety. Once the cab has reached the second preset target temperature, if the PTC heater still has remaining power, then the remaining power can be used to heat the power battery. Specifically, the proportional valve is controlled to be fully closed so that the PTC heater can utilize the remaining power to heat the power battery.

[0067] It should be noted that the first preset target temperature in this embodiment can be determined based on the relationship between the specific power battery temperature and its discharge capacity. For example, the first preset target temperature can be set to 15 degrees Celsius. The second preset target temperature in this embodiment can be specifically determined based on the user's specific requirements for the cab temperature, such as setting the second preset target temperature to 26 degrees Celsius.

[0068] In summary, the thermal management control device for electric vehicles in this embodiment of the invention allocates the heating power of the PTC heater according to the temperature of the cab and the temperature of the power battery, and determines the heating priority of the cab and the battery end to ensure that the power battery can be charged normally in low-temperature environments and that the temperature of the cab will not be too low, thereby improving the driving safety of electric vehicles and the user experience.

[0069] Furthermore, the present invention also proposes a computer-readable storage medium and a thermal management control program for an electric vehicle, which, when executed by a processor, implements the thermal management control method for the electric vehicle described in the above embodiments.

[0070] According to an embodiment of the present invention, a computer-readable storage medium, through a processor executing a thermal management control program for an electric vehicle stored thereon, can allocate the heating power of the PTC heater according to the cab temperature and the power battery temperature, ensuring that the power battery can charge normally during driving in low-temperature environments and that the cab temperature will not be too low, thereby improving the driving safety of the electric vehicle and the user experience.

[0071] Figure 5 This is a structural block diagram of a thermal management control device for an electric vehicle according to an embodiment of the present invention.

[0072] Furthermore, such as Figure 5 As shown, the present invention proposes a thermal management control device 50 for electric vehicles, which includes an acquisition module 501 and a control module 502.

[0073] In this embodiment, the acquisition module 501 is used to acquire the power battery information and the remaining available power of the electric vehicle, and to acquire the cab temperature of the electric vehicle. The power battery information includes the power battery temperature and the power battery charge. The control module 502 is used to limit the power of the PTC heater of the electric vehicle when it is determined that the power battery discharge capacity meets the preset requirements based on the remaining available power of the vehicle and the power battery charge, and to allocate the heating power of the PTC heater according to the cab temperature and the power battery temperature.

[0074] In one embodiment of the present invention, determining that the power battery discharge capacity meets the preset requirements based on the remaining available power of the vehicle and the power battery charge includes: determining that the power battery discharge capacity meets the preset requirements when the remaining available power of the vehicle is less than a first preset power or the power battery charge is less than a first preset charge threshold.

[0075] In one embodiment of the present invention, the control module 502 is further configured to, when performing power limiting control on the PTC heater of the electric vehicle, if the remaining available power of the vehicle is less than a second preset power or the power battery charge is less than a second preset charge threshold, then prohibit the PTC heater from working, wherein the second preset power is less than the first preset power and the second preset charge threshold is less than the first preset charge threshold.

[0076] In one embodiment of the present invention, the control module 502 is further configured to determine correction parameters before determining that the discharge capacity of the power battery meets the preset requirements; and to correct the remaining available power of the vehicle and / or the power battery charge according to the correction parameters.

[0077] In one embodiment of the invention, the correction parameter is determined based on at least one of the following: altitude, slope, driving mode, speed, and battery temperature of the electric vehicle's current driving environment.

[0078] In one embodiment of the present invention, the control module 502 is specifically used to determine the opening degree of the proportional valve of the PTC heater according to the cab temperature and the power battery temperature; and to control the PTC heater to distribute heating power to the cab and power battery of the electric vehicle according to the opening degree of the proportional valve.

[0079] In one embodiment of the present invention, the control module 502 is specifically used to determine the opening degree of the proportional valve to be the opening degree corresponding to the proportional valve being in the fully closed state when the cab temperature is greater than the first preset temperature, so that the PTC heater only heats the power battery; and to determine the opening degree of the proportional valve to be the opening degree corresponding to the proportional valve being in the fully open state when the cab temperature is less than the second preset temperature, so that the PTC heater only heats the cab and the second preset temperature is less than the first preset temperature.

[0080] In one embodiment of the present invention, the control module 502 is specifically used to calculate the proportional valve opening according to the following formula when the cab temperature is less than or equal to the first preset temperature and greater than or equal to the second preset temperature: x=C1*(T1-T)+(tT)*C2, where x represents the proportional valve opening for heating the cab, T1 represents the first preset temperature, T represents the cab temperature, t represents the power battery temperature, and C1 and C2 represent preset constants.

[0081] In one embodiment of the present invention, the control module 502 is further configured to control the proportional valve to be fully open so that the PTC heater heats only the cab when the power battery reaches a first preset target temperature and the heating power of the PTC heater is greater than zero; and to control the proportional valve to be fully closed so that the PTC heater heats only the power battery when the cab reaches a second preset target temperature and the heating power of the PTC heater is greater than zero.

[0082] It should be noted that for details not disclosed in the thermal management control device for electric vehicles in this embodiment of the invention, please refer to the details disclosed in the thermal management control method for electric vehicles in this embodiment of the invention, which will not be repeated here.

[0083] In summary, the thermal management control device for electric vehicles according to this embodiment of the invention includes an acquisition module and a control module. First, the acquisition module acquires information about the electric vehicle's power battery, the remaining available power of the vehicle, and the passenger compartment temperature. Then, the control module determines, based on the remaining available power of the vehicle and the power battery charge level in the power battery information, that the power battery's discharge capacity meets preset requirements. At this point, it performs power-limiting control on the electric vehicle's PTC heater and allocates the heating power of the PTC heater according to the passenger compartment temperature and the power battery temperature in the power battery information. Therefore, the thermal management control device for electric vehicles according to this embodiment of the invention can acquire the passenger compartment temperature and the power battery temperature to allocate the heating power of the PTC heater, ensuring that the power battery can charge normally during driving in low-temperature environments and that the passenger compartment temperature does not become too low, thereby improving the driving safety of the electric vehicle and the user experience.

[0084] Figure 6 This is a structural block diagram of an electric vehicle according to an embodiment of the present invention.

[0085] Furthermore, such as Figure 6 As shown, the present invention proposes an electric vehicle 60, which includes the thermal management control device 50 of the electric vehicle in the above embodiment.

[0086] The electric vehicle of this invention includes the thermal management control device of the electric vehicle in the above embodiments. It distributes the heating power of the PTC heater according to the temperature of the cab and the temperature of the power battery, so as to ensure that the power battery can be charged normally in low temperature environment and that the temperature of the cab will not be too low, thereby improving the driving safety of the electric vehicle and the user experience.

[0087] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0088] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0089] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0091] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0092] In this invention, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific implementation.

[0093] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0094] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A thermal management control method of an electric vehicle, characterized by, The method includes: The system obtains the power battery information and remaining available power of the electric vehicle, and obtains the cab temperature of the electric vehicle. The power battery information includes the power battery temperature and the power battery charge. When the power battery discharge capacity meets the preset requirements based on the remaining available power of the vehicle and the power battery charge, the power of the PTC heater of the electric vehicle is limited, and the heating power of the PTC heater is allocated according to the cab temperature and the power battery temperature. The allocation of heating power of the PTC heater based on the cab temperature and the power battery temperature includes: The opening degree of the proportional valve of the PTC heater is determined based on the cab temperature and the power battery temperature. The PTC heater is controlled to distribute heating power to the driver's cab and power battery of the electric vehicle according to the opening degree of the proportional valve; Determining the proportional valve opening of the PTC heater based on the cab temperature and the power battery temperature includes: When the temperature in the cab is greater than the first preset temperature, the opening degree of the proportional valve is determined to be the opening degree corresponding to when the proportional valve is in the fully closed state, so that the PTC heater only heats the power battery; When the cab temperature is lower than the second preset temperature, the opening degree of the proportional valve is determined to be the opening degree corresponding to when the proportional valve is in the fully open state, so that the PTC heater only heats the cab, and the second preset temperature is lower than the first preset temperature; When the cab temperature is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, the proportional valve opening is calculated according to the following formula: x = C1 * (T1 - T) + (tT) * C2 Where x represents the opening degree of the proportional valve for heating the cab, T1 represents the first preset temperature, T represents the cab temperature, t represents the power battery temperature, and C1 and C2 represent preset constants.

2. The thermal management control method of claim 1, wherein, Determining whether the power battery discharge capacity meets preset requirements based on the remaining available power of the vehicle and the power battery charge includes: When the remaining available power of the vehicle is less than a first preset power or the power battery charge is less than a first preset charge threshold, it is determined that the power battery discharge capacity meets the preset requirements.

3. The thermal management control method of claim 2, wherein, When performing power limiting control on the PTC heater of the electric vehicle, the method further includes: If the remaining available power of the vehicle is less than the second preset power or the power battery charge is less than the second preset charge threshold, the PTC heater is prohibited from operating, wherein the second preset power is less than the first preset power and the second preset charge threshold is less than the first preset charge threshold.

4. The thermal management control method of claim 2, wherein, Before determining that the discharge capacity of the power battery meets the preset requirements, the method further includes: Determine the correction parameters; The remaining available power of the vehicle and / or the power battery charge are corrected according to the correction parameters.

5. The thermal management control method of claim 4, wherein, The correction parameter is determined based on at least one of the following: altitude, slope, driving mode, speed, and battery temperature of the electric vehicle's current driving environment.

6. The thermal management control method of claim 1, wherein, The method further includes: When the power battery reaches the first preset target temperature and the heating power of the PTC heater is greater than zero, the proportional valve is controlled to be in the fully open state so that the PTC heater heats only the cab. When the cab reaches the second preset target temperature and the heating power of the PTC heater is greater than zero, the proportional valve is controlled to be in the fully closed state so that the PTC heater only heats the power battery.

7. A computer readable storage medium characterized in that, It stores a thermal management control program for an electric vehicle, which, when executed by a processor, implements the thermal management control method for an electric vehicle as described in any one of claims 1-6.

8. A thermal management control device of an electric vehicle, characterized by, The device includes: The acquisition module is used to acquire the power battery information and the remaining available power of the electric vehicle, and to acquire the cab temperature of the electric vehicle, wherein the power battery information includes the power battery temperature and the power battery charge. The control module is used to limit the power of the PTC heater of the electric vehicle when the discharge capacity of the power battery meets the preset requirements based on the remaining available power of the vehicle and the power battery charge, and to allocate the heating power of the PTC heater according to the cab temperature and the power battery temperature. The control module is used to: determine the opening degree of the proportional valve of the PTC heater according to the cab temperature and the power battery temperature; and control the PTC heater to distribute heating power to the cab and power battery of the electric vehicle according to the opening degree of the proportional valve. The determination of the proportional valve opening of the PTC heater based on the cab temperature and the power battery temperature includes: when the cab temperature is greater than a first preset temperature, determining the proportional valve opening to be the opening corresponding to the proportional valve being fully closed, so that the PTC heater only heats the power battery; when the cab temperature is less than a second preset temperature, determining the proportional valve opening to be the opening corresponding to the proportional valve being fully open, so that the PTC heater only heats the cab, the second preset temperature being less than the first preset temperature; when the cab temperature is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, calculating the proportional valve opening according to the following formula: x = C1 * (T1 - T) + (tT) * C2 Where x represents the opening degree of the proportional valve for heating the cab, T1 represents the first preset temperature, T represents the cab temperature, t represents the power battery temperature, and C1 and C2 represent preset constants.

9. An electric vehicle characterized by comprising: Includes the thermal management control device for electric vehicles as described in claim 8.

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