An electric vehicle air conditioning control system with forced cooling after PTC shutdown

Abstract

This utility model discloses an electric vehicle air conditioning control system with forced cooling after PTC shutdown, relating to the field of electric vehicle air conditioning control technology. The electric vehicle air conditioning control system with forced cooling after PTC shutdown mainly includes: a first relay, a first fuse, a vehicle controller, a power distribution unit, a second fuse, an air conditioning PTC, a third fuse, a fourth fuse, a first diode, a second diode, a pressure switch, a second relay, a blower, a speed control module, an electric compressor, an electric air conditioning controller, a first temperature sensor, a second temperature sensor, a third temperature sensor, a first motor, a second motor, and a third motor. Implementing the electric vehicle air conditioning control system with forced cooling after PTC shutdown provided by this utility model can effectively dissipate heat and cool the air conditioning system, extending the lifespan of the heating system.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle air conditioning control technology, and more specifically, to an electric vehicle air conditioning control system that provides forced cooling after the PTC is turned off. Background Technology

[0002] Turning off the air conditioning when parking is an important step. Currently, electric vehicles commonly use PTC heating, whose surface temperature typically approaches or exceeds 100°C. When the blower is operating at low speed, the PTC surface temperature can reach 140°C, transferring up to 85°C to the air conditioner's plastic casing. In conventional electric vehicles, after normally turning off the PTC during driving, the air conditioner blower may not be turned off simultaneously. In this case, the blower will continue to operate, blowing out the residual heat from the PTC without damaging the air conditioning system. However, if the blower is simultaneously de-energized, the hot air from the PTC surface cannot escape, and the maximum surface temperature (windshield side) can reach 160°C. This high temperature can damage the air conditioning assembly and the plastic air duct system. Many drivers habitually turn the ignition lock to the OFF position or remove the ignition key before leaving the vehicle. In this case, the blower is also simultaneously de-energized, and similarly, the hot air from the PTC surface cannot escape, causing damage to the air conditioning assembly and the plastic air duct system. In conventional electric vehicles, when the temperature reaches the threshold of the temperature control switch, the switch trips, cutting off the PTC circuit and stopping the PTC from overheating to prevent the temperature from rising further. However, this prevents hot air from being blown out. This drawback of conventional electric vehicles means that prolonged operation in this manner will shorten the lifespan of the air conditioning system, causing direct economic losses for the owner. Utility Model Content

[0003] The purpose of this invention is to provide an electric vehicle air conditioning control system that provides forced heat dissipation after the PTC is turned off, which can effectively dissipate heat and cool the air conditioning system and extend the life of the heating system.

[0004] This utility model provides an electric vehicle air conditioning control system with forced heat dissipation after PTC is turned off, including a first relay, a first fuse, a vehicle controller, a power distribution unit, a second fuse, an air conditioning PTC, a third fuse, a fourth fuse, a first diode, a second diode, a pressure switch, a second relay, a blower, a speed control module, an electric compressor, an electric air conditioning controller, a first temperature sensor, a second temperature sensor, a third temperature sensor, a first motor, a second motor, and a third motor.

[0005] The electric vehicle air conditioning control system with forced heat dissipation after PTC shutdown provided by this utility model has the following beneficial effects:

[0006] This invention relates to a system where, when the car ignition lock is in the ON position and the electric air conditioning controller is normally turning off the PTC switch and blower switch, the electric air conditioning controller continues to operate the blower at medium speed to cool the PTC until the PTC temperature is detected to be below a preset threshold. When the car ignition lock is turned to the OFF position or the driver removes the ignition key, if the PTC temperature is detected to be above the preset threshold, the electric air conditioning controller continues to operate the blower at medium speed to cool the PTC. After a preset time, the air conditioning system stops operating, thus cooling the air conditioning system, blowing out the residual heat from the PTC, lowering the temperature of the heater and plastic duct system, extending the lifespan of the heater system, thereby improving the safety of the air conditioning system and the vehicle, and reducing economic losses for the car owner.

[0007] This method is simple to improve, easy to implement, low in cost, and easy to improve existing products and implement in new products. It provides good protection and will not cause any user discomfort. Attached Figure Description

[0008] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0009] Figure 1 This is the electrical schematic diagram of the electric vehicle air conditioning control system with forced heat dissipation after PTC shutdown provided by this utility model;

[0010] Among them, 1. First relay, 2. First fuse, 3. Vehicle controller, 4. Power distribution unit, 5. Second fuse, 6. Air conditioning PTC, 7. Third fuse, 8. Fourth fuse, 9. First diode, 10. Second diode, 11. Pressure switch, 12. Second relay, 13. Blower, 14. Speed ​​control module, 15. Electric compressor, 16. Electric air conditioning controller, 17. First temperature sensor, 18. Second temperature sensor, 19. Third temperature sensor, 20. First motor, 21. Second motor, 22. Third motor;

[0011] Figure 2 This is a schematic diagram of the electric air conditioning controller in the electric vehicle air conditioning control system with forced heat dissipation after PTC shutdown provided by this utility model. Detailed Implementation

[0012] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0013] Figure 1A schematic diagram of an electric vehicle air conditioning control system with forced cooling after PTC shutdown is shown in this embodiment. In this embodiment, the electric vehicle air conditioning control system with forced cooling after PTC shutdown includes a first relay 1, a first fuse 2, a vehicle controller 3, a power distribution unit 4, a second fuse 5, an air conditioning PTC 6, a third fuse 7, a fourth fuse 8, a first diode 9, a second diode 10, a pressure switch 11, a second relay 12, a blower 13, a speed control module 14, an electric compressor 15, an electric air conditioning controller 16, a first temperature sensor 17, a second temperature sensor 18, a third temperature sensor 19, a first motor 20, a second motor 21, and a third motor 22.

[0014] In one exemplary embodiment, the positive terminal of the control terminal of the first relay 1 is connected to the anode of the second diode 10 and the positive terminal of the ignition lock ON position. The negative terminal of the control terminal of the first relay 1 is grounded. The input terminal of the controlled terminal of the first relay 1 is connected to one end of the first fuse 2 and the input terminal of the controlled terminal of the second relay 12. The other end of the first fuse 2 is connected to the positive terminal of constant power. The output terminal of the controlled terminal of the first relay 1 is connected to the anode of the first diode 9.

[0015] In one exemplary embodiment, the negative terminal of the control terminal of the second relay 12 is grounded, the output terminal of the controlled terminal of the second relay 12 is connected to the blower 13, and the blower 13 is electrically connected to the speed control module 14 and the electric air conditioning controller 16.

[0016] In one exemplary embodiment, one end of the pressure switch 11 is connected to the cathode of the first diode 9, the cathode of the second diode 10, the positive terminal of the control terminal of the second relay 12, and the power input terminal of the electric air conditioner controller 16.

[0017] In one exemplary embodiment, the other end of pressure switch 11 is connected to the pressure switch feedback terminal of electric compressor 15 and electric air conditioning controller 16.

[0018] In one exemplary embodiment, the electric air conditioning controller 16 is electrically connected to the first temperature sensor 17, the second temperature sensor 18, the third temperature sensor 19, the first motor 20, the second motor 21, and the third motor 22.

[0019] In one exemplary embodiment, the vehicle controller 3 is electrically connected to the power distribution unit 4, the electric compressor 15, and the electric air conditioning controller 16 via the vehicle bus.

[0020] In one exemplary embodiment, the power distribution unit 4 is configured to distribute high-voltage electricity to the air conditioning PTC6 and the electric compressor 15 according to the command of the vehicle controller 3.

[0021] In one exemplary embodiment, the first relay 1 is used for continuous heat dissipation delay of the blower, the second relay 12 is used for controlling the power supply of the blower, the first temperature sensor 17 is used for detecting the defrost temperature, the second temperature sensor 18 is used for detecting the PTC temperature, the third temperature sensor 19 is used for detecting the indoor temperature, the first motor 20 is used for controlling the hot and cold air damper, the second motor 21 is used for controlling the mode damper, and the third motor 22 is used for controlling the circulation damper; the first motor 20 and the second motor 21 are stepper motors.

[0022] In one exemplary embodiment, the electric air conditioning controller 16 also includes a blower speed switch 23 and a PTC switch 24.

[0023] In some embodiments, the electric vehicle air conditioning control system with forced cooling after PTC shutdown can also be implemented in the following ways.

[0024] In this embodiment, the electric vehicle air conditioning control system with forced cooling after PTC shutdown includes: a blower continuous cooling delay relay, a VCU (vehicle control unit), a PDU (power distribution unit), an air conditioning PTC, a fuse, a pressure switch, an electric compressor, a blower relay, a blower, a speed control module, an electric air conditioning controller, a circulating damper motor, a mode damper stepper motor, a hot and cold damper stepper motor, an indoor temperature sensor, a PTC temperature sensor, and a defrost temperature sensor. Figure 1 As shown, 1 is the blower continuous heat dissipation delay relay, 2 is the fuse, 3 is the VCU (vehicle control unit), 4 is the PDU (power distribution unit), 5 is the fuse, 6 is the air conditioning PTC, 7 is the fuse, 8 is the fuse, 9 is the diode, 10 is the diode, 11 is the pressure switch, 12 is the blower relay, 13 is the blower, 14 is the speed control module, 15 is the electric compressor, 16 is the electric air conditioning controller, 17 is the defrost temperature sensor, 18 is the PTC temperature sensor, 19 is the indoor temperature sensor, 20 is the cold and hot air damper stepper motor, 21 is the mode damper stepper motor, 22 is the circulation damper motor, 23 is the blower gear switch, and 24 is the PTC switch. Figure 2 A schematic diagram of the electric air conditioning controller in an electric vehicle air conditioning control system that provides forced cooling after the PTC is turned off.

[0025] It should be noted that the purpose of the electric vehicle air conditioning control system with forced cooling after the PTC is turned off is as follows: 1. When the vehicle ignition lock is in the ON position and the electric air conditioning controller normally turns off the PTC switch and blower switch, the electric air conditioning controller controls the blower to continue running at medium speed to blow air to the PTC for cooling until the PTC temperature is detected to be below 80°C, at which point the blower stops working; 2. When the vehicle ignition lock is turned to the OFF position or the driver removes the ignition key, if the PTC temperature is detected to be above 80°C, the electric air conditioning controller controls the blower to continue running at medium speed to blow air to the PTC for cooling, and then controls the air conditioning to stop working after 20 seconds. This is to cool down the air conditioning system.

[0026] The electric vehicle air conditioning control system, which forces cooling after the PTC (Power Toll Collection) is turned off, automatically monitors the vehicle's PTC temperature. One method involves the ignition lock being in the ON position. When the PTC switch and blower switch are normally turned off, if the detected PTC temperature exceeds 80°C, the electric air conditioning controller keeps the blower running at medium speed to cool the PTC until the temperature drops below 80°C, at which point the blower stops working, thus cooling the air conditioning system. Another method occurs when the vehicle is parked, the ignition lock is turned OFF, or the driver removes the ignition key. If the detected PTC temperature exceeds 80°C, the electric air conditioning controller keeps the blower running at medium speed to cool the PTC for 20 seconds, then stops the air conditioning system, cooling the system, reducing the temperature of the heater and plastic duct system, and extending the lifespan of the heater system. This method is simple to improve, easy to implement, low-cost, and readily adaptable to existing products and new products. It provides good protection and will not cause user discomfort.

[0027] It should be noted that in this embodiment, the electric vehicle air conditioning control system with forced cooling after the PTC is turned off is installed in the driver's compartment of the electric vehicle. The constant voltage is 0-24V (or 0-12V). This embodiment is described using a voltage of 0-24V. When the ignition lock is in the ON position, the +24V power from the ignition lock ON position supplies power to pin A1 of the electric air conditioning controller 16 through wire 003, diode 10, and wire 004. At this time, diode 9 isolates the +24V power from wire 004, preventing it from being conducted into wire 002. Pin A17 of the electric air conditioning controller 16 is grounded through wire 009 and PTC temperature sensor 18, detecting the operating temperature of the PTC.

[0028] In this embodiment, when the ignition lock is in the ON position, the +24V power from the ON position of the ignition lock supplies power to pin A1 of the electric air conditioning controller 16 through wire 003, diode 10, and wire 004. When operating the PTC switch 24 on the electric air conditioning controller 16 to turn off the PTC and operating the blower speed switch 23 on the electric air conditioning controller 16 to turn off the blower, if pin A17 of the electric air conditioning controller 16 detects a PTC temperature higher than 80°C through the PTC temperature sensor 18, pin A14 of the electric air conditioning controller 16, through wire 007 and speed control module 14, controls the blower 13 to continue running at medium speed to cool the PTC. The blower 13 stops operating when pin A17 of the electric air conditioning controller 16 detects a PTC temperature lower than 80°C through the PTC temperature sensor 18.

[0029] In this embodiment, the blower continuous heat dissipation delay relay 1 is a power-off delay relay with a power-off delay time of 20 seconds (or other time). When the driver removes the ignition key or turns the key to the OFF position, after pin 85 of the blower continuous heat dissipation delay relay 1 detects the power failure, pins 30 and 87 of the blower continuous heat dissipation delay relay 1 immediately engage. The constant +24V power continues to supply power to pin A1 of the electric air conditioning controller 16 through wire 001, pin 30 of the blower continuous heat dissipation delay relay 1, pin 87 of the blower continuous heat dissipation delay relay 1, wire 002, diode 9, and wire 004. Diode 10 is used to isolate the +24V power from wire 004 at this time to prevent it from being conducted into wire 003. At this time, wire 004 continues to provide +24V power to the coil 86 of blower relay 12, and the contacts 30 and 87 of blower relay 12 are still engaged and conducting; at the same time, the constant +24V power continues to supply +24V power to blower 13 through wire 001, contact 30 of blower relay 12, and contact 87 of blower relay 12. If pin A17 of the electric air conditioner controller 16 detects a PTC temperature higher than 80°C via PTC temperature sensor 18, the high potential of pin A14 of the electric air conditioner controller 16, through wire 007 and pin B of speed control module 14, connects pins C and E of speed control module 14, controlling blower 13 to continue running at medium speed to cool the PTC. Blower continuous cooling delay relay 1 automatically stops working after 20 seconds, disconnecting pins 30 and 87 of blower continuous cooling delay relay 1, de-energizing pin A1 of electric air conditioner controller 16, and stopping electric air conditioner controller 16 and controlling blower 13 to stop. If pin A17 of the electric air conditioner controller 16 detects a PTC temperature not higher than 80°C via PTC temperature sensor 18, electric air conditioner controller 16 controls blower 13 to stop working.

[0030] The following section, with reference to the accompanying diagram, provides a further explanation of the electric vehicle air conditioning control system with forced cooling after the PTC is turned off.

[0031] like Figure 1 , Figure 2 As shown, the electric vehicle air conditioning control system with forced cooling after PTC shutdown includes: a blower continuous cooling delay relay 1, a fuse 2, a VCU (Vehicle Controller Unit) 3, a PDU (Power Distribution Unit) 4, a fuse 5, an air conditioning PTC 6, a fuse 7, a fuse 8, a diode 9, a diode 10, a pressure switch 11, a blower relay 12, a blower 13, a speed control module 14, an electric compressor 15, an electric air conditioning controller 16, a defrost temperature sensor 17, a PTC temperature sensor 18, an indoor temperature sensor 19, a stepper motor for the hot / cold air damper 20, a stepper motor for the mode air damper 21, a circulation air damper motor 22, and interconnecting wires. The electric air conditioning controller 16 is controlled by a microcontroller and includes a blower speed switch 23 and a PTC switch 24. The electric air conditioning controller 16 is connected to the VCU (Vehicle Controller Unit) 3 and the electric compressor 15, and the VCU (Vehicle Controller Unit) 3 is connected to the PDU (Power Distribution Unit) 4 via CAN bus control. The specific operation is as follows:

[0032] 1. The VCU (Vehicle Controller) 3 is the core controller of the electric vehicle. It controls the PDU power distribution unit 4, electric air conditioning controller 16, electric compressor 15, battery system, electric drive system, etc. through the vehicle bus (CAN1H / CAN1L, CANH / CANL) and various wires.

[0033] PDU (Power Distribution Unit) 4 is the power distribution unit of the electric vehicle. It is responsible for distributing high-voltage electricity to the air conditioning PTC6, electric compressor 15 and other high-voltage components according to the command of VCU (Vehicle Controller) 3, and provides functions such as circuit protection and status monitoring.

[0034] The electric air conditioning controller 16 is the core of the air conditioning control of electric vehicles. It receives various signals from the defrost temperature sensor 17, PTC temperature sensor 18, indoor temperature sensor 19, VCU (vehicle controller) 3, electric compressor 15, etc. via the CANH / L bus and various wires. When operating the blower speed switch 23, PTC switch 24 and other switches on the electric air conditioning controller 16, it can control the air volume of the blower 13 through the speed control module 14, control the cooling or heating blowing state through the cold and hot air damper stepper motor 20, control the opening and closing of the air outlets at various positions such as the head / foot / face / defrost through the mode damper stepper motor 21, control the internal / external circulation damper state through the circulation damper motor 22, etc., and control the PDU (power distribution unit) 4 through the VCU (vehicle controller) 3 (which in turn controls the air conditioning PTC 6), thereby indirectly controlling the heating of the air conditioning PTC 6 or the cooling of the electric compressor 15.

[0035] 2. When the electric air conditioning controller 16 is operating with +24V power connected at pin A1, operating the PTC switch 24 on the electric air conditioning controller 16 to turn on the PTC will cause the electric air conditioning controller 16 to send a command to the VCU (Vehicle Controller Unit) 3 via the CANH / CANL bus. The VCU will then send a command to the PDU (Power Distribution Unit) 4 via the CAN1H / CAN1L bus, causing the PDU to connect the high-voltage heating current of the air conditioning PTC6, thus starting the heating operation of the air conditioning PTC6. Conversely, when the electric air conditioning controller 16 is operating with +24V power connected at pin A1, operating the PTC switch 24 on the electric air conditioning controller 16 to turn off the PTC will cause the electric air conditioning controller 16 to send a command to the VCU (Vehicle Controller Unit) 3 via the CANH / CANL bus, instructing the VCU (Vehicle Controller Unit) 3 to send a command to the PDU (Power Distribution Unit) 4 via the CAN1H / CAN1L bus, thus stopping the heating operation of the air conditioning PTC6.

[0036] 3. When the ignition lock is in the ON position, the +24V power from the ON position of the ignition lock supplies power to the electric air conditioning controller 16 through wire 003 → diode 10 → wire 004 → pin A1 of the electric air conditioning controller 16. When the PTC switch 24 and blower speed switch 23 on the electric air conditioning controller 16 are operated to turn off the PTC and the blower respectively, if the PTC temperature sensor 18 detects that the PTC temperature is higher than 80°C through pin A17 of the electric air conditioning controller 16, pin A14 of the electric air conditioning controller 16 → wire 007 → pin B of the speed control module 14 controls the blower 13 to continue running at medium speed to blow air to cool the PTC (the circuit flow is: constant power +24V → fuse 2 → wire 001 → contact 30 of blower relay 12 → contact 87 of blower relay 12 → blower 13 → wire 006 → pin C of speed control module 14 → pin E of speed control module 14 → ground). If the electric air conditioner controller 16 detects that the PTC temperature is not higher than 80°C through the PTC temperature sensor 18 at pin 17, the electric air conditioner controller 16 controls the blower 13 to stop working.

[0037] 4. When the driver removes the ignition key or turns the key to the OFF position, the voltage of wire 003 connected to the ignition lock ON position+ drops from 24V to 0V. When pin 85 of the blower continuous cooling delay relay 1 receives this 0V low voltage signal, it is activated and enters the working state. Pins 30 and 87 of the blower continuous cooling delay relay 1 are immediately connected.

[0038] 4.1 At this time, the constant +24V power supply flows through wire 001 → pin 30 of the blower continuous cooling delay relay 1 → pin 87 of the blower continuous cooling delay relay 1 → wire 002 → diode 9 → wire 004 → to supply power to pin A1 of the electric air conditioner controller 16. The electric air conditioner controller 16 remains operational. Simultaneously, after pin 86 of the blower relay 12 coil receives the +24V voltage from wire 004, pins 30 and 87 of the blower relay 12 remain energized, continuing to supply +24V power to the blower 13.

[0039] 4.2 At this time, if the PTC temperature detected by the PTC temperature sensor 18 through pin A17 of the electric air conditioner controller 16 is higher than 80°C, the high potential of pin A14 of the electric air conditioner controller 16 will connect pin C and pin E of the speed control module 14 through wire 007 to pin B of the speed control module 14, controlling the blower 13 to continue running at medium speed to blow air to cool the PTC. After 20 seconds, the delay time of the blower continuous cooling delay relay 1 ends and stops working. Pins 30 and 87 of the blower continuous cooling delay relay 1 are disconnected, the power supply of the electric air conditioner controller 16 is cut off and it stops working, and the blower 13 stops running.

[0040] 3. Because the PTC temperature sensor uses a high-precision thermistor, it can accurately control the PTC to work precisely.

[0041] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. An electric vehicle air conditioning control system with forced heat dissipation after PTC shutdown, characterized in that, include: First relay (1), first fuse (2), vehicle controller (3), power distribution unit (4), second fuse (5), air conditioning PTC (6), third fuse (7), fourth fuse (8), first diode (9), second diode (10), pressure switch (11), second relay (12), blower (13), speed control module (14), electric compressor (15), electric air conditioning controller (16), first temperature sensor (17), second temperature sensor (18), third temperature sensor (19), first motor (20), second motor (21), third motor (22).

2. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system according to claim 1, characterized by, The positive terminal of the control terminal of the first relay (1) is connected to the anode of the second diode (10) and the positive terminal of the ignition lock ON position. The negative terminal of the control terminal of the first relay (1) is grounded. The input terminal of the controlled terminal of the first relay (1) is connected to one end of the first fuse (2) and the input terminal of the controlled terminal of the second relay (12). The other end of the first fuse (2) is connected to the positive terminal of constant power. The output terminal of the controlled terminal of the first relay (1) is connected to the anode of the first diode (9).

3. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system according to claim 2, characterized by, The negative terminal of the control terminal of the second relay (12) is grounded, and the output terminal of the controlled terminal of the second relay (12) is connected to the blower (13). The blower (13) is electrically connected to the speed control module (14) and the electric air conditioning controller (16).

4. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system according to claim 3, characterized by, One end of the pressure switch (11) is connected to the cathode of the first diode (9), the cathode of the second diode (10), the positive terminal of the control terminal of the second relay (12), and the power input terminal of the electric air conditioner controller (16).

5. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system according to claim 4, characterized by, The other end of the pressure switch (11) is connected to the pressure switch feedback terminal of the electric compressor (15) and the electric air conditioning controller (16).

6. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system according to claim 5, characterized by, The electric air conditioner controller (16) is electrically connected to the first temperature sensor (17), the second temperature sensor (18), the third temperature sensor (19), the first motor (20), the second motor (21), and the third motor (22).

7. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system of claim 1, wherein, The vehicle controller (3) is electrically connected to the power distribution unit (4), electric compressor (15), and electric air conditioning controller (16) via the vehicle bus.

8. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system of claim 1, wherein, The power distribution unit (4) is configured to distribute high voltage power to the air conditioning PTC (6) and electric compressor (15) according to the command of the vehicle controller (3).

9. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system of claim 1, wherein, The first relay (1) is used for continuous heat dissipation delay of the blower, the second relay (12) is used to control the power supply of the blower, the first temperature sensor (17) is used to detect the defrost temperature, the second temperature sensor (18) is used to detect the PTC temperature, the third temperature sensor (19) is used to detect the indoor temperature, the first motor (20) is used to control the hot and cold air damper, the second motor (21) is used to control the mode damper, and the third motor (22) is used to control the circulation damper; the first motor (20) and the second motor (21) are stepper motors.

10. The PTC post-shutoff forced heat dissipating electric vehicle air conditioner control system of claim 1, wherein, The electric air conditioning controller (16) also includes a blower speed switch (23) and a PTC switch (24).

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