Automobile external control variable emission compressor control system, control method and automobile air conditioner

Abstract

The invention provides a control system and a control method for an automobile external control variable exhaust compressor and an automobile air conditioner, and belongs to the technical field of in-automobile temperature control, and the control system comprises a touch display module, a sensor module, a control module and a compressor external control valve. The touch display module sends an air conditioner refrigeration starting instruction and an air conditioner temperature setting instruction to the control module, and the sensor module inputs automobile state information to the control module. And the control module determines a target adjusting value of the compressor external control valve according to the evaporator target temperature and the evaporator actual temperature. And the control module limits the target adjusting value of the compressor external control valve according to the difference value between the target temperature of the evaporator and the actual temperature of the evaporator, determines the actual adjusting value of the compressor external control valve, and sends a control instruction to control the opening degree of the compressor external control valve according to the actual adjusting value of the compressor external control valve. The temperature in the automobile is kept stable when the accelerator of the automobile is suddenly stepped on, and the comfort of a user is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of in-vehicle temperature control, and in particular, relates to a control system and a control method for an automobile externally controlled variable displacement compressor and an automobile air conditioner. Background Art

[0002] With the advent of intelligent cars, people have higher and higher requirements for driving comfort. Externally controlled variable displacement compressors can provide customers with a better experience of stable air outlet temperature compared to traditional fixed displacement compressors. However, the cooling capacity of externally controlled variable displacement compressors is affected by two factors, one controllable factor (the size of the external control valve opening) and one uncontrollable factor (the speed of the compressor). Since the speed of the compressor is affected by the speed of the engine, when the driver suddenly steps on the accelerator, the speed of the compressor suddenly increases, breaking the original cooling balance.

[0003] Chinese patent 108891230A relates to a PID+FF feedforward closed-loop control method based on an electric compressor of a pure electric vehicle. After the air-conditioning system enters the normal mode, a speed value of an electric compressor is calculated respectively according to the temperature error value through a position PID control sub-algorithm with integral deviation, a position PID control sub-algorithm with feedforward compensation, and a table lookup PID control sub-algorithm. Then, the three speed values ​​are added together to calculate a total speed value. Finally, the total speed value is used to adjust the speed of the electric compressor. When the air-conditioning system is started or shut down, a position PID control sub-algorithm with start / shutdown protection is used to calculate the speed value of the electric compressor.

[0004] The existing technology cannot solve the problem of rapid drop in temperature inside the car caused by the driver suddenly stepping on the accelerator, which will affect the comfort of the passengers. Summary of the invention

[0005] The present invention aims to provide a control system, a control method and a car air conditioner for an automobile externally controlled variable displacement compressor, so as to stabilize the temperature inside the car and improve the user comfort when the accelerator is suddenly stepped on.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The present invention provides an automobile externally controlled variable displacement compressor control system, comprising a touch display module, a sensor module, a control module and a compressor external control valve, wherein the output end of the touch display module is connected to the input end of the control module, the output end of the control module is connected to the input end of the touch display module, the output end of the sensor module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the compressor external control valve.

[0008] The touch display module outputs air conditioning switch instructions and air conditioning temperature setting instructions to the control module, the control module outputs the car air conditioning on state to the touch display module, the sensor module outputs car state information to the control module, and the control module outputs control instructions to the compressor external control valve.

[0009] The touch display module adopts a vehicle-mounted touch screen.

[0010] The sensor module includes an evaporator temperature sensor, an in-vehicle temperature sensor, an out-vehicle temperature sensor and a light intensity sensor, and the output end of the evaporator temperature sensor, the output end of the in-vehicle temperature sensor, the output end of the out-vehicle temperature sensor and the output end of the light intensity sensor are respectively connected to the input end of the control module.

[0011] The control module includes a microcontroller and a compressor external control valve driving circuit.

[0012] The output end of the microcontroller is connected to the input end of the compressor external control valve driving circuit, and the output end of the compressor external control valve driving circuit is connected to the input end of the compressor external control valve.

[0013] The present invention provides a method for controlling an externally controlled variable displacement compressor of an automobile:

[0014] Step 1: The touch display module sends an air conditioning cooling start instruction and an air conditioning temperature setting instruction to the control module, and the sensor module inputs the vehicle status information to the control module;

[0015] Step 2: The control module calculates the target adjustment value of the compressor external control valve in real time according to the evaporator target temperature and the evaporator actual temperature;

[0016] Step 3: The control module limits the target adjustment value of the compressor external control valve according to the difference between the evaporator target temperature and the actual evaporator temperature, determines the actual adjustment value of the compressor external control valve, and the control module issues a control instruction to control the opening of the compressor external control valve according to the actual adjustment value of the compressor external control valve.

[0017] In step 2, the control module determines the evaporator target temperature according to the temperature inside the vehicle, the temperature outside the vehicle, the air conditioning setting temperature and the sunlight intensity outside the vehicle.

[0018] In step three, the microcontroller outputs a pulse width modulation voltage through the compressor external control valve drive circuit to control the opening of the compressor external control valve.

[0019] The present invention provides an automobile air conditioner, including an automobile externally controlled variable displacement compressor control system and a control method.

[0020] The technical effects of the present invention are:

[0021] (1) The present invention can prevent the temperature inside the vehicle from dropping too quickly when the compressor rotates too fast due to the driver's sudden accelerator pedal movement, thereby improving the comfort of passengers.

[0022] (2) The present invention provides multiple sensors to collect environmental information to determine the target temperature of the evaporator, thereby improving the accuracy of temperature regulation in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] This specification includes the following drawings, which show the following contents:

[0024] Figure 1 A logic structure block diagram of a vehicle externally controlled variable displacement compressor control system, a control method and a vehicle air conditioner of the present invention;

[0025] Figure 1 The markings are: 1. touch display module; 2. sensor module; 3. control module; 4. compressor external control valve. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0027] The present invention provides a control system for an automobile externally controlled variable displacement compressor, comprising a touch display module 1, a sensor module 2, a control module 3 and a compressor external control valve 4, wherein the output end of the touch display module 1 is connected to the input end of the control module 3, the output end of the sensor module 2 is connected to the input end of the control module 3, the output end of the control module 3 is connected to the input end of the touch display module 1, and the output end of the control module 3 is connected to the input end of the compressor external control valve 4. The touch display module 1 outputs an air conditioning switch instruction and an air conditioning temperature setting instruction to the control module 3, the control module 3 outputs the automobile air conditioning on state to the touch display module 1, the sensor module 2 outputs automobile state information to the control module 3, and the control module 3 outputs a control instruction to the compressor external control valve 4.

[0028] The touch display module 1 adopts a vehicle-mounted touch screen. The sensor module 2 includes an evaporator temperature sensor, an in-vehicle temperature sensor, an out-vehicle temperature sensor, and a light intensity sensor. The output end of the evaporator temperature sensor, the output end of the in-vehicle temperature sensor, the output end of the out-vehicle temperature sensor, and the output end of the light intensity sensor are respectively connected to the input end of the control module 3. The control module 3 includes a microcontroller and a compressor external control valve 4 drive circuit. The output end of the microcontroller is connected to the input end of the compressor external control valve 4 drive circuit, and the output end of the compressor external control valve 4 drive circuit is connected to the input end of the compressor external control valve 4.

[0029] The present invention provides a method for controlling an externally controlled variable displacement compressor of an automobile:

[0030] Step 1: The touch display module 1 sends an air conditioning cooling start instruction and an air conditioning temperature setting instruction to the control module 3, and the sensor module 2 inputs the vehicle status information to the control module 3;

[0031] Step 2: The control module 3 calculates the target adjustment value of the compressor external control valve 4 in real time according to the evaporator target temperature and the evaporator actual temperature;

[0032] Step three: The control module 3 limits the target adjustment value of the compressor external control valve 4 according to the difference between the evaporator target temperature and the actual evaporator temperature, determines the actual adjustment value of the compressor external control valve 4, and the control module 3 issues a control instruction to control the opening of the compressor external control valve 4 according to the actual adjustment value of the compressor external control valve 4.

[0033] In step 2, the control module 3 determines the evaporator target temperature by the temperature inside the vehicle, the temperature outside the vehicle, the air conditioning setting temperature and the sunlight intensity outside the vehicle. In step 3, the microcontroller outputs a pulse width modulation voltage to control the opening of the compressor external control valve 4 through the compressor external control valve 4 driving circuit.

[0034] The present invention provides an automobile air conditioner, including an automobile externally controlled variable displacement compressor control system and a control method.

[0035] The following is a detailed description of an automobile externally controlled variable displacement compressor control system, a control method and an automobile air conditioner according to the present invention.

[0036] The present invention discloses an automobile externally controlled variable displacement compressor control system, comprising a touch display module 1, a sensor module 2, a control module 3 and a compressor external control valve 4, wherein the touch display module 1 is used to send an air conditioning switch command to the control module 3, the control module 3 controls the opening of the compressor external control valve 4, and the driver sets the air conditioning temperature through the touch display module 1, and the touch display module 1 adopts a vehicle-mounted touch screen.

[0037] The sensor module 2 includes an evaporator temperature sensor, an in-car temperature sensor, an out-car temperature sensor, and a light intensity sensor. The evaporator temperature sensor, the in-car temperature sensor, the out-car temperature sensor, and the light intensity sensor respectively collect the automobile air conditioner evaporator temperature, the in-car temperature, the out-car temperature, and the out-car light intensity. The control module 3 converts the obtained analog information into a digital quantity through AD sampling technology. The present invention provides multiple sensors to collect environmental information to determine the target temperature of the evaporator, thereby improving the accuracy of in-car temperature regulation.

[0038] The control module 3 includes a microcontroller and a compressor external control valve 4 drive circuit. The microcontroller is used to determine the evaporator target temperature according to the temperature inside the car, the temperature outside the car, the air conditioner setting temperature and the light intensity outside the car, and adjust the opening of the compressor external control valve 4 according to the evaporator target temperature and the actual evaporator temperature. At the same time, the opening state of the automobile air conditioner is fed back to the touch display module 1, and the driver checks whether the automobile air conditioner is turned on through the touch display module 1. The compressor external control valve 4 drive circuit is used to amplify the pulse width modulation voltage sent by the microcontroller to stably control the opening of the compressor external control valve 4. The microcontroller of the present invention uses a FC4150 model microcontroller.

[0039] The opening of the compressor external control valve 4 determines the displacement of the compressor. The larger the displacement, the better the cooling effect. The present invention achieves the effect of stably regulating the temperature inside the vehicle by accurately controlling the opening of the compressor external control valve 4 through the pulse width modulation voltage output by the microcontroller.

[0040] A control method for an automobile externally controlled variable displacement compressor of the present invention is as follows:

[0041] The touch display module 1 sends an air conditioning cooling start instruction and an air conditioning temperature setting instruction to the control module 3. The evaporator temperature sensor, the in-vehicle temperature sensor, the outside temperature sensor and the light intensity sensor in the sensor module 2 respectively collect the car air conditioning evaporator temperature, the in-vehicle temperature, the outside temperature and the outside light intensity and input these car status information into the control module 3.

[0042] The control module 3 determines the target temperature of the evaporator through the temperature inside the car, the temperature outside the car, the air-conditioning setting temperature and the sunlight intensity outside the car. Specifically, the evaporator target temperature corresponding to different temperatures inside the car, the temperature outside the car, the air-conditioning setting temperature and the sunlight intensity outside the car is stored in the microcontroller. After receiving the information of the temperature inside the car, the temperature outside the car, the air-conditioning setting temperature and the sunlight intensity outside the car, the microcontroller determines the target temperature of the evaporator through retrieval. The control module 3 calculates the target adjustment value of the compressor external control valve 4 in real time through the PID algorithm according to the evaporator target temperature and the actual evaporator temperature. On this basis, the control module 3 limits the target adjustment value of the compressor external control valve 4 according to the difference between the evaporator target temperature and the actual evaporator temperature, and determines the actual adjustment value of the compressor external control valve 4. In an embodiment of the present invention, the limiting strategy for the target adjustment value of the compressor external control valve 4 is as follows:

[0043] Evaporator target temperature - evaporator actual temperature ≤0 1 2 ≥3 Limit value of target adjustment value of compressor external control valve 25％ 50％ 70％ 100％

[0044] The limit value intervals of the target adjustment value of the compressor external control valve 4 are 100%-70%, 70%-50%, and 50%-25%, which change linearly in the difference ranges of 0-1°C, 1-2°C, and 2-3°C between the evaporator target temperature and the evaporator actual temperature, respectively.

[0045] The control module 3 issues a control instruction to control the opening of the compressor external control valve 4 according to the actual adjustment value of the compressor external control valve 4. Specifically, the control module 3 outputs a pulse width modulation voltage through the compressor external control valve 4 drive circuit to control the opening of the compressor external control valve 4. It is manifested that when the actual evaporator temperature is lower than the evaporator target temperature, the microcontroller controls the compressor external control valve 4 to open smaller, reduces the compressor displacement, reduces the cooling effect, and increases the temperature inside the vehicle. Under the premise that the actual evaporator temperature is lower than the evaporator target temperature, the greater the difference between the actual evaporator temperature and the evaporator target temperature, the greater the limit value of the target adjustment value of the compressor external control valve 4, the smaller the opening of the compressor external control valve 4 is adjusted by the microcontroller, and the faster the temperature inside the vehicle recovers.

[0046] The present invention can prevent the temperature in the vehicle from dropping too quickly when the compressor rotates too fast due to the driver's sudden accelerator pedal movement, thereby improving the comfort of passengers.

[0047] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A control system for an automobile external variable displacement compressor, characterized in that: It includes a touch display module, a sensor module, a control module and a compressor external control valve, wherein the output end of the touch display module is connected to the input end of the control module, the output end of the control module is connected to the input end of the touch display module, the output end of the sensor module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the compressor external control valve.

2. The control system for an externally controlled variable displacement compressor for an automobile as claimed in claim 1, characterized in that: The touch display module outputs air conditioning switch instructions and air conditioning temperature setting instructions to the control module, the control module outputs the car air conditioning on state to the touch display module, the sensor module outputs car state information to the control module, and the control module outputs control instructions to the compressor external control valve.

3. The control system for an automobile external variable displacement compressor according to claim 1, characterized in that: The touch display module adopts a vehicle-mounted touch screen.

4. The automotive external variable displacement compressor control system according to claim 1, characterized in that: The sensor module includes an evaporator temperature sensor, an in-vehicle temperature sensor, an out-vehicle temperature sensor and a light intensity sensor, and the output end of the evaporator temperature sensor, the output end of the in-vehicle temperature sensor, the output end of the out-vehicle temperature sensor and the output end of the light intensity sensor are respectively connected to the input end of the control module.

5. The control system for an externally controlled variable displacement compressor for an automobile as claimed in claim 1, characterized in that: The control module includes a microcontroller and a compressor external control valve driving circuit.

6. The control system for an externally controlled variable displacement compressor for an automobile as claimed in claim 1 or 5, characterized in that: The output end of the microcontroller is connected to the input end of the compressor external control valve driving circuit, and the output end of the compressor external control valve driving circuit is connected to the input end of the compressor external control valve.

7. A control method for an externally controlled variable displacement compressor for an automobile as claimed in any one of claims 1 to 6, characterized in that: Step 1: The touch display module sends an air conditioning cooling start instruction and an air conditioning temperature setting instruction to the control module, and the sensor module inputs the vehicle status information to the control module; Step 2: The control module calculates the target adjustment value of the compressor external control valve in real time according to the evaporator target temperature and the evaporator actual temperature; Step 3: The control module limits the target adjustment value of the compressor external control valve according to the difference between the evaporator target temperature and the actual evaporator temperature, determines the actual adjustment value of the compressor external control valve, and the control module issues a control instruction to control the opening of the compressor external control valve according to the actual adjustment value of the compressor external control valve.

8. A method for controlling an externally controlled variable displacement compressor for an automobile as claimed in claim 7, characterized in that: In step 2, the control module determines the evaporator target temperature according to the temperature inside the vehicle, the temperature outside the vehicle, the air conditioning setting temperature and the sunlight intensity outside the vehicle.

9. A method for controlling an externally controlled variable displacement compressor for an automobile as claimed in claim 7, characterized in that: In step three, the microcontroller outputs a pulse width modulation voltage through the compressor external control valve drive circuit to control the opening of the compressor external control valve.

10. An automobile air conditioner, characterized in that: It comprises a control system and a control method for an automobile externally controlled variable displacement compressor as described in any one of claims 1-9.

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