PTC (Positive Temperature Coefficient) request power control method and system and automobile

Abstract

The invention discloses a PTC (Positive Temperature Coefficient) 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-charging-power working condition of a battery or not; whether the air heating PTC is in an open state or not is confirmed; and in response to the situation that the automobile is in the low-charging-power working condition of the battery and the air heating PTC is in the open state, the air heating PTC is controlled to lock the gear so that the difference value between the PTC request power and the PTC actual use power can be within the preset range. The PTC request power distribution control system comprises a whole vehicle controller and an air heating PTC. According to the invention, the risk of overcharging of the battery is reduced, and the safety of using the air heating PTC in a low-temperature environment or other working conditions of low charging power of the battery of the vehicle is improved.

Description

Technical Field

[0001] The 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 development of electric vehicles, car air conditioning is an essential accessory for vehicles and is a key concern for consumers when buying cars. Air-heating PTC (Positive Temperature Coefficient) is an air-heating positive temperature coefficient thermistor, which is a device that uses the characteristics of positive temperature coefficient ceramic elements to generate heat. Air-heating PTC has a simple structure, low cost and can be used immediately, which has attracted the attention of automotive industry workers.

[0003] The working principle of the existing wind-heating PTC is that the resistance wire is heated, and the PTC power regulation is achieved by continuously switching on and off through PWM (Pulse Width Modulation) or IGBT (Insulated Gate Bipolar Transistor) and adjusting the duty cycle. However, the existing method of air-heating PTC power distribution of this technology has some defects. For example, when the air-heating PTC operates at an 80% duty cycle (4800W power), the TMS (Thermal Management System) sends a 4800W request power to the air-heating PTC, and the electric drive or generator or charging pile recovers or generates or supplies power according to the request power required by the PTC. The IGBT of the air-heating PTC is in working state 80% of the time, during which the air-heating PTC consumes power normally and the battery is fine. However, the IGBT of the air-heating PTC is in the off state 20% of the time, during which the air-heating PTC does not consume power, resulting in the actual power used by the air-heating PTC being lower than the requested power. The energy recovery of the motor and the generator or charging pile of the extended-range electric vehicle are continuously powered. The power during the IGBT shutdown period has nowhere to be consumed, resulting in excess power being charged back into the battery, resulting in battery charging current fluctuations. However, when the ambient temperature is lower or the battery charging power is lower, the excess power charged into the battery will cause battery failure, affect the battery life, and bring great driving safety hazards.

[0004] CN118306214A discloses a vehicle heating device and a control method thereof, wherein the vehicle heating device comprises a switch device, a heating device, a capacitor and a controller; one end of the switch device is connected to one end of the capacitor, and the other end of the switch 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 switch device, and is used to control the operation of the switch device according to a control signal of a preset PWM frequency determined by a preset current value, so that the current fluctuation amplitude value generated by the switch device at the preset PWM frequency is less than or equal to the preset current value; wherein the preset current value is determined by the maximum charging current allowed by the battery of the vehicle and the rated charging current of the battery. The vehicle heating device can reduce the battery overcharging caused by the current fluctuation of the heating device under the charging condition, and improve the safety of the heating of the heating device. Undoubtedly, the technical solution disclosed in the above patent document is a beneficial attempt in the technical field, but the types of working conditions it is applicable to are relatively few. 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 using air-heated PTC in vehicles under low temperature environments or other battery low charging power conditions.

[0006] A PTC request power control method in the present invention comprises: Confirm whether the vehicle is in a low battery charging power condition; Confirm whether the air heating PTC is in the on state; 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.

[0007] Further, the controlling the air heating 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 wind-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 lock gear; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT work alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs work.

[0008] Furthermore, the method further includes controlling the distribution of the PTC requested power, including: In the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the charging system power supply request power; After controlling the air-heating PTC to lock the gear, the PTC request power is included in the charging system power supply request power.

[0009] Further, the step of confirming 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 duration of the battery SOC being lower than the first SOC threshold exceeds the first duration threshold, it is determined that the vehicle is in a low battery charging power condition; When the charging mode is the electric drive recovery mode, the battery SOC is monitored, and if the duration of the battery SOC being higher than the second SOC threshold exceeds the second duration threshold, it is determined that the vehicle is in a low battery charging power 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 the third duration threshold, it is determined that the vehicle is in a low battery charging power condition.

[0010] 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.

[0011] A PTC request power distribution control system in the present invention 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 condition; confirm whether the wind heating PTC is in an on state; and in response to the vehicle being in a low battery charging power condition and the wind heating PTC being in an on state, send a lock request to the wind 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.

[0012] 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 work alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs work.

[0013] Furthermore, it also includes a generator, an electric drive, a power battery and a battery management module; After the vehicle controller determines that the charging mode of the power battery is the generator energy replenishment mode, the battery SOC is monitored through the battery management module. 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. 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, and in the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the generator power generation power; after controlling the air-heating PTC to lock the gear, the PTC request 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 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, and 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; 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 for which the current charging power is 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. At this time, if the air-heated PTC is in the on state, the air-heated 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-heated PTC to lock the gear, the PTC requested power is not included in the charging pile power supply request power; after controlling the air-heated PTC to lock the gear, the PTC requested power is included in the charging pile power supply request power.

[0014] A car in the present invention uses the above-mentioned PTC request power control method.

[0015] A car in the present invention comprises the above-mentioned PTC request power distribution control system.

[0016] The beneficial effects of the present invention are: (1) When the vehicle is in a low battery charging power condition and the air-heating PTC is in an on state, the present invention controls the air-heating 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. 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.

[0017] (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 requested 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 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 A schematic flow chart of a PTC request power control method of the present invention; Figure 2 It is a detailed schematic diagram of the process of the PTC request power control method of the present invention. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] Embodiment 1: like Figure 1 and Figure 2 As shown, a PTC request power control method in this embodiment includes: Confirm whether the vehicle is in a low battery charging power condition; Confirm whether the air heating PTC is in the on state; 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 request 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 in an on state, the working state of the air heating PTC is not changed and the power distribution of the PTC request power is not changed.

[0021] 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.

[0022] The upper limit of the power requested by the charging system is usually calculated based on the maximum allowable charging power of the power battery and the power of the external high-voltage load, and the PTC request power is one of the powers of the external high-voltage load. If the car is in a high battery charging power condition, the maximum allowable charging power of the power battery is higher, which makes the upper limit of the power requested by the charging system higher, and the maximum current threshold of the battery charging is also higher. The difference between the PTC request power and the actual power used by the PTC is not a large proportion of the upper limit of the power requested by the charging system, so the current fluctuation caused by the difference has a low risk of overcharging the power battery.

[0023] If the car is in a high battery charging power condition, the maximum allowable charging power of the power battery is low, which makes the upper limit of the charging system power request power also low, and the maximum current threshold of the battery charging is also low. The difference between the PTC request power and the PTC actual power usage accounts for a large proportion of the upper limit of the charging system power request power, so the current fluctuation caused by the difference has a high risk of overcharging the power battery.

[0024] 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 power usage 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 low temperature environments or other low battery charging power conditions is improved.

[0025] In this embodiment, the controlling of the air heating 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 wind-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 lock gear; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT work alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs work.

[0026] After the gear is locked, if it runs at a 50% duty cycle, the two IGBTs work alternately. Since the power of the two IGBTs is the same, the PTC request power is basically the same as the actual PTC power, and no difference is generated. After the gear is locked, if it runs at a 100% duty cycle, all IGBTs work without fluctuations, so the PTC request power is basically the same as the actual PTC power, and no difference is generated.

[0027] In this embodiment, the method further includes controlling the allocation of the PTC requested power, including: In the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the charging system power supply request power; After controlling the air-heating PTC to lock the gear, the PTC request power is included in the charging system power supply request power.

[0028] The charging system may be a generator, an electric drive or a charging pile, etc. After receiving the power request from the charging system, the charging system supplies power according to the power level.

[0029] During the process of locking the gear, 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 wind-heating PTC is provided by the power battery. The fluctuation of the actual power used by the PTC does not affect the power generation of the generator, the power generation of the electric drive or the power supply of the charging pile, reducing the risk of battery overcharge. After locking the gear, the PTC request power is basically the same as the actual power used by the PTC. 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 wind-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. By determining whether the PTC request power is the generator power generation, the electric drive recovery power or the charging pile power request power, the distribution of the PTC request power can be optimized, the distribution of the PTC request power is more reasonable, and it is easy to control, which guarantees the safe use of the battery to the greatest extent.

[0030] In this embodiment, the step of confirming 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. If the duration for which the battery SOC is lower than the first SOC threshold 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.

[0031] The battery SOC is the ratio of the available power in the battery to the nominal capacity. When the battery SOC is low, the generator of the extended-range electric vehicle generates electricity to charge the power battery. If the battery SOC is still lower than the first SOC threshold after a long period of charging, it means that the charging capacity of the power battery is poor (the factors affecting the charging capacity may include: ambient temperature, battery temperature, battery status, etc.). Therefore, at this time, the car is in the battery low charging power condition recognized in this embodiment.

[0032] 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.

[0033] 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 battery low charging power working condition identified in this embodiment.

[0034] When the charging mode is the charging pile charging mode, monitor the current charging power. 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 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.

[0035] 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 condition identified in this embodiment.

[0036] 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.

[0037] In this embodiment, 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.

[0038] Embodiment 2: A PTC request power distribution control system in this embodiment 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 condition; confirm whether the wind heating PTC is in an on state; and in response to the vehicle being in a low battery charging power condition and the wind heating PTC being in an on state, send a lock request to the wind 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.

[0039] 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.

[0040] The upper limit of the power requested by the charging system is usually calculated based on the maximum allowable charging power of the power battery and the power of the external high-voltage load, and the PTC request power is one of the powers of the external high-voltage load. If the car is in a high battery charging power condition, the maximum allowable charging power of the power battery is higher, which makes the upper limit of the power requested by the charging system higher, and the maximum current threshold of the battery charging is also higher. The difference between the PTC request power and the actual power used by the PTC is not a large proportion of the upper limit of the power requested by the charging system, so the current fluctuation caused by the difference has a low risk of overcharging the power battery.

[0041] If the car is in a high battery charging power condition, the maximum allowable charging power of the power battery is low, which makes the upper limit of the charging system power request power also low, and the maximum current threshold of the battery charging is also low. The difference between the PTC request power and the PTC actual power usage accounts for a large proportion of the upper limit of the charging system power request power, so the current fluctuation caused by the difference has a high risk of overcharging the power battery.

[0042] 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 power usage 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 low temperature environments or other low battery charging power conditions is improved.

[0043] 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 work alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs work.

[0044] After the gear is locked, if it runs at a 50% duty cycle, the two IGBTs work alternately. Since the power of the two IGBTs is the same, the PTC request power is basically the same as the actual PTC power, and no difference is generated. After the gear is locked, if it runs at a 100% duty cycle, all IGBTs work without fluctuations, so the PTC request power is basically the same as the actual PTC power, and no difference is generated.

[0045] In this embodiment, it also includes a generator, an electric drive, a power battery and a battery management module; 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 that exceeds the first duration threshold, it is determined that the vehicle is in a low battery charging power condition. At this time, if the wind-heating PTC is in the on state, the wind-heating PTC is controlled to lock the gear so that the difference between the PTC request power and the PTC actual use power is within a preset range, and in the process of controlling the wind-heating PTC to lock the gear, the PTC request power is not included in the generator power generation power; after controlling the wind-heating PTC to lock the gear, the PTC request power is included in the generator power generation power. Battery SOC is the ratio of the available power in the battery to the nominal capacity. When the battery SOC is low, the generator of the extended-range electric vehicle generates electricity to replenish the power battery. If the battery SOC is still lower than the first SOC threshold after a long period of charging, it means that the charging capacity of the power battery is poor (the factors affecting the charging capacity may include: ambient temperature, battery temperature, battery status, etc.). Therefore, at this time, the car is in the battery low charging power condition recognized in this embodiment.

[0046] When the vehicle controller determines that the charging mode of the power battery is the electric drive recovery mode, the battery SOC is monitored through 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 wind-heated PTC is in the on state, the wind-heated 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, and in the process of controlling the wind-heated PTC to lock the gear, the PTC request power is not included in the electric drive recovery power; after controlling the wind-heated 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 gliding 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 battery low charging power condition recognized in this embodiment.

[0047] 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 through 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-heated PTC is in the on state, the air-heated 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-heated PTC to lock the gear, the PTC request power is not included in the charging pile power request power; after controlling the air-heated 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 through 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 battery low charging power condition recognized in this embodiment.

[0048] During the process of locking the gear, 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 wind-heating PTC is provided by the power battery. The fluctuation of the actual power used by the PTC does not affect the power generation of the generator, the power generation of the electric drive or the power supply of the charging pile, reducing the risk of battery overcharge. After locking the gear, the PTC request power is basically the same as the actual power used by the PTC. 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 wind-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. By determining whether the PTC request power is the generator power generation, the electric drive recovery power or the charging pile power request power, the distribution of the PTC request power can be optimized, the distribution of the PTC request power is more reasonable, and it is easy to control, which guarantees the safe use of the battery to the greatest extent.

[0049] Embodiment three: A car in this embodiment uses the PTC request power control method in the first embodiment.

[0050] Embodiment 4: A car in this embodiment uses the PTC request power distribution control system in the second embodiment.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. 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 solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should 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: Confirm whether the vehicle is in a low battery charging power condition; Confirm whether the air heating PTC is in the on state; 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.

2. The PTC request power control method according to claim 1, characterized in that: The controlling the air heating 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 wind-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 lock gear; when the air-heating PTC operates at a 50% duty cycle, the two parts of the IGBT work alternately; when the air-heating PTC operates at a 100% duty cycle, all of the IGBTs work.

3. The PTC request power control method according to claim 1, characterized in that: The method further includes controlling the distribution of the PTC requested power, including: In the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the charging system power supply request power; After controlling the air-heating PTC to lock the gear, the PTC request power is included in the charging system power supply request power.

4. The PTC request power control method according to any one of claims 1 to 3, characterized in that: The confirmation of 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 duration of the battery SOC being lower than the first SOC threshold exceeds the first duration threshold, it is determined that the vehicle is in a low battery charging power condition; When the charging mode is the electric drive recovery mode, the battery SOC is monitored, and if the duration of the battery SOC being higher than the second SOC threshold exceeds the second duration threshold, it is determined that the vehicle is in a low battery charging power 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 the third duration threshold, it is determined that the vehicle is in a low battery charging power condition.

5. The PTC request power control method according to claim 4, characterized in that: 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.

6. A PTC request power distribution control system, characterized in that: Including vehicle controller and air heating PTC; The vehicle controller is used to: confirm whether the vehicle is in a low battery charging power condition; confirm whether the wind heating PTC is in an on state; and in response to the vehicle being in a low battery charging power condition and the wind heating PTC being in an on state, send a lock request to the wind 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.

7. The PTC requested power distribution control system according to claim 6, characterized in that: The wind-heating PTC performs power regulation through IGBT, and the IGBT is divided into two parts; after the wind-heating PTC receives the gear lock request, the wind-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.

8. The PTC requested power distribution control system according to claim 7, 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 through the battery management module. 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. 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, and in the process of controlling the air-heating PTC to lock the gear, the PTC request power is not included in the generator power generation power; after controlling the air-heating PTC to lock the gear, the PTC request 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 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, and 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; 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 for which the current charging power is 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. At this time, if the air-heated PTC is in the on state, the air-heated 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-heated PTC to lock the gear, the PTC requested power is not included in the charging pile power supply request power; after controlling the air-heated PTC to lock the gear, the PTC requested power is included in the charging pile power supply request power.

9. A car, characterized in that: The PTC requested power control method as described in any one of claims 1 to 5 is used.

10. An automobile, characterized in that: It comprises the PTC request power distribution control system as described in any one of claims 6-8.

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