Ptc request power control method, system and automobile

Abstract

The application discloses a PTC request power control method and system and an automobile. The PTC request power control method comprises the following steps: confirming whether the automobile is in a low battery charging power working condition; confirming whether a wind heating PTC is in an open state; in response to the fact that the automobile is in the low battery charging power working condition and the wind heating PTC is in the open state, controlling the wind heating PTC to be locked to make the difference between PTC request power and PTC actual use power within a preset range. The PTC request power distribution control system comprises a vehicle controller and the wind heating PTC. The application reduces the risk of overcharging of the battery and improves the safety of the vehicle in a low temperature environment or other low battery charging power working conditions.

Description

Technical Field

[0001] The present invention relates to an automobile air conditioner, and in particular to a PTC request power control method, system and automobile. Background Art

[0002] With the rise of electric vehicles, in-vehicle air conditioning, as an essential accessory, is a key consideration for consumers when purchasing a vehicle. Air-heating PTCs (Positive Temperature Coefficient) are devices that utilize the properties of positive temperature coefficient ceramic elements to generate heat. Air-heating PTCs are valued by automotive industry professionals for their simple structure, low cost, and immediate usability.

[0003] The working principle of the existing wind-heating PTC is to heat the resistance wire, and the PTC power regulation is achieved by continuously switching on and off through PWM (Pulse Width Modulation) or IGBT (Insulated Gate Bipolar Transistor) to adjust the duty cycle. However, the existing method for distributing PTC power for air heaters has some drawbacks. For example, when the PTC is operating at an 80% duty cycle (4800W), the TMS (Thermal Management System) requests 4800W of power to the PTC. The electric drive, generator, or charging station then recovers, generates, or supplies power according to the PTC's requested power. However, the PTC's IGBT is in operation 80% of the time, during which time the PTC consumes power normally and the battery is safe. However, the PTC's IGBT is in the off state 20% of the time, during which time the PTC consumes no power. This results in the PTC's actual power usage being lower than the requested power. Since the motor's energy recovery and the EV's generator or charging station provide continuous power, the power during the IGBT's off period has nowhere to be consumed, causing excess power to be backcharged into the battery, resulting in battery charging current fluctuations. However, at lower ambient temperatures or at lower battery charging powers, this excess power can cause battery failure, shortening battery life and posing a significant safety hazard.

[0004] CN118306214A discloses a vehicle heating device and control method thereof. The vehicle heating device includes a switching device, a heating device, a capacitor, and a controller. One end of the switching device is connected to one end of the capacitor, and the other end of the switching device is connected to one end of the heating device. The other end of the heating device is connected to the other end of the capacitor, and both ends of the capacitor are connected to a DC power supply. The controller is connected to the switching device and is configured to control the operation of the switching device based on a control signal of a preset PWM frequency determined by a preset current value, so that the current fluctuation amplitude generated by the switching device at the preset PWM frequency is less than or equal to the preset current value. The preset current value is determined by the maximum charging current allowed by the vehicle's battery and the rated charging current of the battery. The vehicle heating device can reduce battery overcharging caused by current fluctuations in the heating device during charging conditions, thereby improving the safety of heating by the heating device. While the technical solution disclosed in the above patent document is undoubtedly a beneficial attempt in the relevant technical field, it is applicable to a limited number of operating conditions. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a PTC request power control method, system and vehicle, which reduces the risk of battery overcharging and improves the safety of vehicles using air-heated PTC in low temperature environments or other low battery charging power conditions.

[0006] A PTC request power control method in the present invention includes:

[0007] Check whether the vehicle is in a low battery charging power condition;

[0008] Check whether the air heating PTC is on;

[0009] In response to the vehicle being in a low battery charging power condition and the air heating PTC being in an on state, the air heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range.

[0010] Furthermore, the controlling of the air heater PTC to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range includes:

[0011] The air heating PTC performs power regulation through IGBT, and the IGBT is divided into two parts;

[0012] The air heating PTC receives a gear lock request;

[0013] The air-heating PTC operates at a 50% duty cycle or a 100% duty cycle to complete the gear lock; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT operate alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs operate.

[0014] Furthermore, the method further includes controlling the distribution of the PTC requested power, including:

[0015] During the process of controlling the air heating PTC to lock the gear, the PTC requested power is not included in the charging system power request;

[0016] After controlling the air heating PTC to lock the gear, the PTC request power is included in the charging system power supply request power.

[0017] Furthermore, the step of determining whether the vehicle is in a low battery charging power condition includes:

[0018] Get charging mode;

[0019] When the charging mode is the generator charging mode, the battery SOC is monitored, and if the battery SOC is lower than the first SOC threshold for a duration exceeding the first duration threshold, it is determined that the vehicle is in a low battery charging power operating condition;

[0020] When the charging mode is the electric drive recovery mode, the battery SOC is monitored. If the battery SOC is higher than the second SOC threshold for a duration exceeding the second duration threshold, it is determined that the vehicle is in a low battery charging power operating condition.

[0021] When the charging mode is the charging pile charging mode, the current charging power is monitored. If the duration of the current charging power being lower than the preset power threshold exceeds a third duration threshold, it is determined that the vehicle is in a low battery charging power condition.

[0022] Furthermore, the charging system power supply request power is the generator power generation power, the electric drive recovery power or the charging pile power supply request power.

[0023] A PTC request power distribution control system in the present invention includes a vehicle controller and an air heating PTC;

[0024] The vehicle controller is used to: confirm whether the vehicle is in a low battery charging power operating state; confirm whether the air heating PTC is in an on state; and in response to the vehicle being in a low battery charging power operating state and the air heating PTC being in an on state, issue a lock request to the air heating PTC;

[0025] The air heating PTC is used to: after receiving the gear lock request, lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range.

[0026] Furthermore, the air-heating PTC performs power regulation through IGBT, and the IGBT is divided into two parts; after the air-heating PTC receives a gear lock request, the air-heating PTC operates at a 50% duty cycle or a 100% duty cycle to complete the gear lock; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT operate alternately; when the air-heating PTC operates at a 100% duty cycle, all the IGBTs operate.

[0027] Furthermore, it also includes a generator, electric drive, power battery and battery management module;

[0028] After the vehicle controller determines that the charging mode of the power battery is the generator energy replenishment mode, the battery SOC is monitored by the battery management module. If the battery SOC is lower than the first SOC threshold for a duration exceeding the first duration threshold, it is determined that the vehicle is in a low battery charging power operating condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range. In the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the generator power generation power; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the generator power generation power;

[0029] When the vehicle controller determines that the charging mode of the power battery is the electric drive recovery mode, the battery SOC is monitored by the battery management module. If the battery SOC is higher than the second SOC threshold for a duration exceeding the second duration threshold, it is determined that the vehicle is in a low battery charging power operating condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range. In the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the electric drive recovery power; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the electric drive recovery power.

[0030] When the vehicle controller determines that the charging mode of the power battery is the charging pile charging mode, the current charging power is monitored by the battery management module. If the duration of the current charging power being lower than the preset power threshold exceeds the third time threshold, it is determined that the vehicle is in a low battery charging power condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual power usage is within a preset range, and in the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the charging pile power supply request power; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the charging pile power supply request power.

[0031] A car in the present invention uses the above-mentioned PTC request power control method.

[0032] An automobile in the present invention includes the above-mentioned PTC request power distribution control system.

[0033] The beneficial effects of the present invention are:

[0034] (1) The present invention controls the air-heating PTC to lock the gear when the vehicle is in a low battery charging power condition and the air-heating PTC is in an on state so that the difference between the PTC requested power and the PTC actual used power is within a preset range. Under the premise that the battery overcharge failure does not occur and the battery life is not affected, the safe use of the battery is guaranteed to the greatest extent, the risk of battery overcharge is reduced, and the safety of the vehicle using the air-heating PTC in a low temperature environment or other low battery charging power conditions is improved.

[0035] (2) The present invention conducts targeted design for common scenarios such as generator energy replenishment mode, electric drive recovery mode and charging pile charging mode, and determines whether the PTC request power is the generator power generation power, electric drive recovery power or charging pile power supply request power. It can optimize the distribution of PTC request power, make the distribution of PTC request power more reasonable, and facilitate control, thereby ensuring the safe use of the battery to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0037] Figure 1 Schematic diagram of the flow of the PTC request power control method of the present invention;

[0038] Figure 2 It is a detailed schematic diagram of the process of the PTC request power control method of the present invention. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0040] Example 1:

[0041] like Figure 1 and Figure 2 As shown, a PTC request power control method in this embodiment includes:

[0042] Check whether the vehicle is in a low battery charging power condition;

[0043] Check whether the air heating PTC is on;

[0044] In response to the vehicle being in a low battery charging power condition and the air heating PTC being on, the air heating PTC is controlled to lock so that the difference between the PTC requested power and the PTC actual power usage is within a preset range. If the vehicle is not in a low battery charging power condition or the air heating PTC is not on, the air heating PTC operating state is not changed, and the power distribution of the PTC requested power is not altered.

[0045] When the air-heating PTC is in the on state, the power requested by the charging system is generally superimposed on the power requested by the PTC. Due to the IGBT duty cycle characteristics of the air-heating PTC, there is a certain period of unused power in a cycle, which will cause the actual power used by the PTC to be lower than the power requested by the PTC, which will also cause the actual power used by the battery to be lower than the power requested by the charging system, causing current to be recharged into the power battery.

[0046] The upper limit of the charging system's requested power is typically calculated based on the maximum allowable charging power of the power battery and the power of the external high-voltage load. The PTC requested power is a fraction of the external high-voltage load's power. If the vehicle is operating at high battery charging power, the maximum allowable charging power of the power battery is higher, resulting in a higher upper limit for the charging system's requested power and a higher maximum battery charging current threshold. The difference between the PTC requested power and the actual PTC power usage is not a significant proportion of the upper limit of the charging system's requested power. Therefore, the current fluctuations caused by this difference pose a low risk of overcharging the power battery.

[0047] If the vehicle is operating at high battery charging power, the maximum allowable charging power of the power battery is lower, which in turn lowers the upper limit of the charging system's requested power and the maximum battery charging current threshold. The difference between the PTC requested power and the actual PTC power used is a significant proportion of the upper limit of the charging system's requested power. Therefore, the current fluctuations caused by this difference pose a high risk of overcharging the power battery.

[0048] In this embodiment, when the vehicle is in a low battery charging power condition and the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range. Under the premise that no battery overcharging failure occurs and the battery life is not affected, the safe use of the battery is guaranteed to the greatest extent, the risk of battery overcharging is reduced, and the safety of the vehicle using the air-heating PTC in a low temperature environment or other low battery charging power conditions is improved.

[0049] In this embodiment, controlling the air heater PTC to lock the gear so that the difference between the PTC requested power and the PTC actual power usage is within a preset range includes:

[0050] The air heating PTC performs power regulation through IGBT, and the IGBT is divided into two parts;

[0051] The air heating PTC receives a gear lock request;

[0052] The air-heating PTC operates at a 50% duty cycle or a 100% duty cycle to complete the gear lock; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT operate alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs operate.

[0053] After locking the gear, if the duty cycle is 50%, the two IGBTs work alternately. Since the power of the two IGBTs is the same, the PTC power request and the actual PTC power are basically the same, with no difference. After locking the gear, if the duty cycle is 100%, all IGBTs work completely, and there is no fluctuation. Therefore, the PTC power request and the actual PTC power are basically the same, with no difference.

[0054] In this embodiment, the method further includes controlling the distribution of the PTC requested power, including:

[0055] During the process of controlling the air heating PTC to lock the gear, the PTC requested power is not included in the charging system power request;

[0056] After controlling the air heating PTC to lock the gear, the PTC request power is included in the charging system power supply request power.

[0057] The charging system can be a generator, electric drive or charging pile, etc. After receiving the power request of the charging system, the charging system supplies power according to the power level.

[0058] During the gear lock process, the generator power generation, electric drive recovery power, or charging pile power request power are not superimposed on the PTC request power. The power consumed by the air-heating PTC is provided by the power battery. Fluctuations in the actual power used by the PTC do not affect the generator power generation, electric drive power generation, or charging pile power supply, reducing the risk of battery overcharge. After the gear is locked, the PTC request power is basically the same as the actual PTC power use. At this time, the generator power generation, electric drive recovery power, or charging pile power request power are superimposed on the PTC request power. The power consumed by the air-heating PTC is provided by the generator power generation, electric drive power generation, or charging pile power supply. By determining whether the PTC request power is the generator power generation, electric drive recovery power, or charging pile power request power, the distribution of the PTC request power can be optimized, making the distribution of the PTC request power more reasonable and easier to control, thereby ensuring the safe use of the battery to the greatest extent.

[0059] In this embodiment, determining whether the vehicle is in a low battery charging power condition includes:

[0060] Get charging mode;

[0061] When the charging mode is the generator charging mode, the battery SOC is monitored. If the battery SOC is lower than the first SOC threshold for a duration that exceeds the first duration threshold, it is determined that the vehicle is in a low battery charging power condition; otherwise, it is determined that the vehicle is not in a low battery charging power condition in the current mode.

[0062] Battery SOC is the ratio of available charge to nominal capacity. When the battery SOC is low, the range-extended electric vehicle's generator generates electricity to recharge the power battery. If the battery SOC remains below the first SOC threshold after a long period of charging, it indicates that the power battery's charging capacity is poor (factors that may affect charging capacity include ambient temperature, battery temperature, and battery status). Therefore, the vehicle is currently in the low-charging-power operating condition identified in this embodiment.

[0063] When the charging mode is the electric drive recovery mode, the battery SOC is monitored. If the battery SOC is higher than the second SOC threshold for a duration that exceeds the second duration threshold, it is determined that the vehicle is in a low battery charging power condition; otherwise, it is determined that the vehicle is not in a low battery charging power condition in the current mode.

[0064] During driving, the vehicle has the ability to regenerate energy while coasting. The vehicle calculates the maximum regenerative power based on the maximum allowable charging power of the power battery and the power of the external high-voltage load. When the battery SOC is high, the maximum allowable charging power of the power battery is low. Therefore, the vehicle is also in the low battery charging power operating condition identified in this embodiment.

[0065] When the charging mode is the charging pile charging mode, the current charging power is monitored. If the duration of the current charging power lower than the preset power threshold exceeds the third duration threshold, it is determined that the vehicle is in a low battery charging power condition; otherwise, it is determined that the vehicle is not in a low battery charging power condition in the current mode.

[0066] During charging, the current charging power can be directly monitored by the battery management module. If the current charging power is low for a long time, it means that the charging capacity of the power battery is poor. Therefore, the car is also in the low battery charging power operating condition identified in this embodiment.

[0067] Through targeted design of common scenarios such as generator energy replenishment mode, electric drive recovery mode and charging pile charging mode, it is determined whether the PTC requested power is the generator power generation power, electric drive recovery power or charging pile power supply request power. This can optimize the distribution of PTC requested power, make the distribution of PTC requested power more reasonable, and facilitate control, thereby ensuring the safe use of the battery to the greatest extent.

[0068] In this embodiment, the charging system power supply request power is the generator power, the electric drive recovery power or the charging pile power supply request power.

[0069] Example 2:

[0070] A PTC request power distribution control system in this embodiment includes a vehicle controller and an air heating PTC;

[0071] The vehicle controller is used to: confirm whether the vehicle is in a low battery charging power operating state; confirm whether the air heating PTC is in an on state; and in response to the vehicle being in a low battery charging power operating state and the air heating PTC being in an on state, issue a lock request to the air heating PTC;

[0072] The air heating PTC is used to: after receiving the gear lock request, lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range.

[0073] When the air-heating PTC is in the on state, the power requested by the charging system is generally superimposed on the power requested by the PTC. Due to the IGBT duty cycle characteristics of the air-heating PTC, there is a certain period of unused power in a cycle, which will cause the actual power used by the PTC to be lower than the power requested by the PTC, which will also cause the actual power used by the battery to be lower than the power requested by the charging system, causing current to be recharged into the power battery.

[0074] The upper limit of the charging system's requested power is typically calculated based on the maximum allowable charging power of the power battery and the power of the external high-voltage load. The PTC requested power is a fraction of the external high-voltage load's power. If the vehicle is operating at high battery charging power, the maximum allowable charging power of the power battery is higher, resulting in a higher upper limit for the charging system's requested power and a higher maximum battery charging current threshold. The difference between the PTC requested power and the actual PTC power usage is not a significant proportion of the upper limit of the charging system's requested power. Therefore, the current fluctuations caused by this difference pose a low risk of overcharging the power battery.

[0075] If the vehicle is operating at high battery charging power, the maximum allowable charging power of the power battery is lower, which in turn lowers the upper limit of the charging system's requested power and the maximum battery charging current threshold. The difference between the PTC requested power and the actual PTC power used is a significant proportion of the upper limit of the charging system's requested power. Therefore, the current fluctuations caused by this difference pose a high risk of overcharging the power battery.

[0076] In this embodiment, when the vehicle is in a low battery charging power condition and the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range. Under the premise that no battery overcharging failure occurs and the battery life is not affected, the safe use of the battery is guaranteed to the greatest extent, the risk of battery overcharging is reduced, and the safety of the vehicle using the air-heating PTC in a low temperature environment or other low battery charging power conditions is improved.

[0077] In this embodiment, the air-heating PTC performs power regulation through IGBT, and the IGBT is divided into two parts; after the air-heating PTC receives a gear lock request, the air-heating PTC operates at a 50% duty cycle or a 100% duty cycle to complete the gear lock; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT operate alternately; when the air-heating PTC operates at a 100% duty cycle, all the IGBTs operate.

[0078] After locking the gear, if the duty cycle is 50%, the two IGBTs work alternately. Since the power of the two IGBTs is the same, the PTC power request and the actual PTC power are basically the same, with no difference. After locking the gear, if the duty cycle is 100%, all IGBTs work completely, and there is no fluctuation. Therefore, the PTC power request and the actual PTC power are basically the same, with no difference.

[0079] In this embodiment, it also includes a generator, an electric drive, a power battery and a battery management module;

[0080] After the vehicle controller determines that the power battery's charging mode is the generator charging mode, it monitors the battery SOC via the battery management module. If the battery SOC remains below a first SOC threshold for a period exceeding the first duration threshold, the vehicle is determined to be in a low-battery charging power condition. At this time, if the air-heating PTC is on, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the actual PTC power usage is within a preset range. During the air-heating PTC locking process, the PTC requested power is not included in the generator power; after the air-heating PTC is locked, the PTC requested power is included in the generator power. The battery SOC is the ratio of available power in a battery to its nominal capacity. When the battery SOC is low, the range-extended electric vehicle's generator generates electricity to charge the power battery. If the battery SOC remains below the first SOC threshold after a prolonged period of charging, this indicates that the power battery's charging capacity is poor (factors that may affect charging capacity include ambient temperature, battery temperature, and battery status). Therefore, the vehicle is now in the low-battery charging power condition identified in this embodiment.

[0081] When the vehicle controller determines that the charging mode of the power battery is the electric drive recovery mode, the battery SOC is monitored by the battery management module. If the battery SOC is higher than the second SOC threshold for a duration that exceeds the second duration threshold, it is determined that the vehicle is in a low battery charging power condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC request power and the PTC actual power usage is within a preset range. In the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the electric drive recovery power; after controlling the air-heating PTC to lock the gear, the PTC request power is included in the electric drive recovery power. During driving, the car has the function of coasting to recover energy. The car will calculate the maximum energy recovery power based on the maximum allowable charging power of the power battery and the power of the external high-voltage load. When the battery SOC is high, the maximum allowable charging power of the power battery is small. Therefore, at this time, the car is also in the low battery charging power condition recognized in this embodiment.

[0082] When the vehicle controller determines that the charging mode of the power battery is the charging pile charging mode, the current charging power is monitored by the battery management module. If the duration of the current charging power being lower than the preset power threshold exceeds the third duration threshold, it is determined that the car is in a low battery charging power condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC request power and the PTC actual power usage is within the preset range, and in the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the charging pile power request power; after controlling the air-heating PTC to lock the gear, the PTC request power is included in the charging pile power request power. During charging, the current charging power can be directly monitored by the battery management module. If the current charging power is low for a long time, it means that the charging capacity of the power battery is poor at this time. Therefore, at this time, the car is also in the low battery charging power condition recognized in this embodiment.

[0083] During the gear lock process, the generator power generation, electric drive recovery power, or charging pile power request power are not superimposed on the PTC request power. The power consumed by the air-heating PTC is provided by the power battery. Fluctuations in the actual power used by the PTC do not affect the generator power generation, electric drive power generation, or charging pile power supply, reducing the risk of battery overcharge. After the gear is locked, the PTC request power is basically the same as the actual PTC power use. At this time, the generator power generation, electric drive recovery power, or charging pile power request power are superimposed on the PTC request power. The power consumed by the air-heating PTC is provided by the generator power generation, electric drive power generation, or charging pile power supply. By determining whether the PTC request power is the generator power generation, electric drive recovery power, or charging pile power request power, the distribution of the PTC request power can be optimized, making the distribution of the PTC request power more reasonable and easier to control, thereby ensuring the safe use of the battery to the greatest extent.

[0084] Example 3:

[0085] A car in this embodiment uses the PTC request power control method in the first embodiment.

[0086] Example 4:

[0087] A car in this embodiment uses the PTC request power distribution control system in the second embodiment.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A PTC request power control method, characterized in that: The method comprises: Check whether the vehicle is in a low battery charging power condition; Check whether the air heating PTC is on; In response to the vehicle being in a low battery charging power condition and the air-heating PTC being in an on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual power usage is within a preset range; wherein, the locking gear means that the air-heating PTC operates at a 50% duty cycle or a 100% duty cycle, and when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT operate alternately; when the air-heating PTC operates at a 100% duty cycle, the IGBTs all operate; The distribution of the PTC requested power is controlled: in the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the charging system power supply request power, and the power consumed by the air-heating PTC is provided by the power battery; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the charging system power supply request power, and the power consumed by the air-heating PTC is provided by the power generation of the generator, the power generation of the electric drive or the power supply of the charging pile.

2. The PTC request power control method according to claim 1, wherein: The controlling the air heater PTC to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range includes: The air heating PTC performs power regulation through IGBT, and the IGBT is divided into two parts; The air heating PTC receives a gear lock request; The air-heating PTC operates at a 50% duty cycle or a 100% duty cycle to complete the gear lock; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT operate alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs operate.

3. The PTC requested power control method according to claim 1 or 2, wherein: Determining whether the vehicle is in a low battery charging power condition includes: Get charging mode; When the charging mode is the generator charging mode, the battery SOC is monitored, and if the battery SOC is lower than the first SOC threshold for a duration exceeding the first duration threshold, it is determined that the vehicle is in a low battery charging power operating condition; When the charging mode is the electric drive recovery mode, the battery SOC is monitored. If the battery SOC is higher than the second SOC threshold for a duration exceeding the second duration threshold, it is determined that the vehicle is in a low battery charging power operating condition. When the charging mode is the charging pile charging mode, the current charging power is monitored. If the duration of the current charging power being lower than the preset power threshold exceeds a third duration threshold, it is determined that the vehicle is in a low battery charging power condition.

4. The PTC request power control method according to claim 3, wherein: The charging system power supply request power is the generator power, the electric drive recovery power or the charging pile power supply request power.

5. A PTC requested power distribution control system, characterized in that: Used to implement the PTC request power control method according to any one of claims 1 to 4, the PTC request power distribution control system includes a vehicle controller and an air heating PTC; The vehicle controller is used to: confirm whether the vehicle is in a low battery charging power operating state; confirm whether the air heating PTC is in an on state; and in response to the vehicle being in a low battery charging power operating state and the air heating PTC being in an on state, issue a lock request to the air heating PTC; The air heating PTC is used to: after receiving the gear lock request, lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range.

6. The PTC requested power distribution control system according to claim 5, characterized in that: The air-heating PTC performs power regulation through an IGBT, and the IGBT is divided into two parts; after the air-heating PTC receives a gear lock request, the air-heating PTC operates at a 50% duty cycle or a 100% duty cycle to complete the gear lock; When the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBTs operate alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs operate.

7. The PTC requested power distribution control system according to claim 6, characterized in that: It also includes generators, electric drives, power batteries and battery management modules; After the vehicle controller determines that the charging mode of the power battery is the generator energy replenishment mode, the battery SOC is monitored by the battery management module. If the battery SOC is lower than the first SOC threshold for a duration exceeding the first duration threshold, it is determined that the vehicle is in a low battery charging power operating condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range. In the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the generator power generation power; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the generator power generation power; When the vehicle controller determines that the charging mode of the power battery is the electric drive recovery mode, the battery SOC is monitored by the battery management module. If the battery SOC is higher than the second SOC threshold for a duration exceeding the second duration threshold, it is determined that the vehicle is in a low battery charging power operating condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual used power is within a preset range. In the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the electric drive recovery power; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the electric drive recovery power. When the vehicle controller determines that the charging mode of the power battery is the charging pile charging mode, the current charging power is monitored by the battery management module. If the duration of the current charging power being lower than the preset power threshold exceeds the third time threshold, it is determined that the vehicle is in a low battery charging power condition. At this time, if the air-heating PTC is in the on state, the air-heating PTC is controlled to lock the gear so that the difference between the PTC requested power and the PTC actual power usage is within a preset range, and in the process of controlling the air-heating PTC to lock the gear, the PTC requested power is not included in the charging pile power supply request power; after controlling the air-heating PTC to lock the gear, the PTC requested power is included in the charging pile power supply request power.

8. An automobile, characterized in that: The PTC request power control method according to any one of claims 1 to 4 is used.

9. An automobile, characterized in that: It comprises the PTC request power distribution control system as described in any one of claims 5-7.

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