Start-stop control system for air-conditioning compressor of automobile and control method of control system

Abstract

The invention discloses a start-stop control system for an air-conditioning compressor of an automobile. The control system comprises a controller, a temperature sensor, a humidity sensor and an air volume detection module, wherein the controller is stored with compressor start-stop temperature; the temperature sensor is arranged on the surface of an evaporator and used for detecting evaporator temperature; the controller controls the start and stop of the compressor according to the received evaporator temperature value and the set compressor start-stop temperature; the humidity sensor is used for detecting air humidity at an air-conditioning air inlet and transferring the detected humidity information to the controller; the air volume detection module is used for detecting air velocity at an air-conditioning air outlet and transferring the detected air velocity information to the controller; and the controller is stored with four groups of compressor start-stop temperatures corresponding to high and low air velocities as well as high and low humidities, and alternatively selects the compressor start-stop temperatures to control the start and stop of the compressor. The control system can control the start and stop of the compressor by selecting different temperatures according to the air humidity and the air volume, achieve accurate control of the start and stop of the compressor, and ensure smooth running of an air conditioner of the automobile under any condition, and the maximum refrigerating capacity is an air-conditioning system is improved.

Description

technical field [0001] The invention relates to a system for controlling an automobile air-conditioning compressor, in particular to a start-stop control system for an automobile air-conditioning compressor and a control method thereof. Background technique [0002] As an important part of the car, the performance of the air conditioner directly affects the perception of the passengers in the vehicle. When the compressor of the air conditioner is started, the surface temperature of the evaporator of the car air conditioner will continue to drop. The low temperature of the evaporator surface will cause the surrounding air to condense and form water droplets on the surface of the evaporator. The temperature will continue to drop. When the temperature on the surface of the evaporator drops below 0°C, the water droplets attached to the surface will freeze, thus blocking the blower from blowing air into the car and preventing the air outlet in the cab from blowing air. , directl...

AI Technical Summary

Problems solved by technology

Although the above means can control the start and stop of the compressor according to the temperature on the surface of the evaporator, so as to avoid freezing of the evaporator surface due to too low temperature and ensure the cooling effect of the air conditioner, the accuracy of the start and stop control of the compressor is relatively poor. It is manifested as: if the start-stop temperature of the compressor is set low (for example, between 1°C and 3°C), the controller can control the compressor normally when the wind speed is high or the humidity is low; For low wind speed or high humidity, the surface of the evaporator is prone to frost; When the temperature is low, the controller controls the compressor normally; while when the wind speed is high or the humidity is low, the compressor will stop working prematurely, wasting part of the cooling capacity of the system, reducing the cooling capacity of the system, and the cooling effect cannot meet the needs of passengers. needs

Based on the above reasons, in the prior art, a relatively moderate compressor start-stop temperature is usually specified, 2°C-4°C, but this setting will still cause evaporator frosting or cooling effects under extreme working conditions Insufficient conditions affect the performance of the vehicle

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