Vehicle air conditioner anti-frosting control method

Abstract

The invention provides a vehicle air conditioner anti-frosting control method. The vehicle air conditioner anti-frosting control method comprises the following control steps and collects the following input signals: 1, carrying out electrifying initialization; 2, carrying out signal collection: (1), collecting the temperature of an evaporator as a control input signal; (2), collecting the temperature of inlet air or the temperature of vehicle exterior as a control input signal; (3), collecting the humidity of the inlet air or the humidity of the vehicle exterior as a control input signal; (4), collecting the position of a new air air gate as a control input signal; (5), collecting air blower side voltage as a control input signal; (6), collecting the rotating speed of an engine or the rotating speed of a compressor as a control input signal; 7, collecting the speed of a vehicle as a control input signal; and (8), collecting the On / Off state and the conversion time of the compressor as control input signals; 3, carrying out signal processing and setting a target temperature control point; and 4, controlling the connection and disconnection of the compressor. The vehicle air conditioner anti-frosting control method utilizing the signals collected according to factors, such as environment, work condition and mode, as novel target temperature control points can ensure that a vehicle air conditioner is not prone to frosting, can exert the optimum performance of the vehicle air conditioner, and can improve the riding comfort of passengers.

Description

technical field [0001] The invention relates to the design and manufacture of a vehicle air conditioner, in particular to a control method for preventing frosting of a vehicle air conditioner. Background technique [0002] Preventing the frosting of the vehicle air conditioner is one of the key technologies to design the vehicle air conditioner to maximize its performance. At present, the anti-frost control of the vehicle air conditioner is carried out by determining an evaporator position point and determining the temperature point of the vehicle air conditioner control through the previous calibration test: including a cut-off temperature and a recovery temperature. When the temperature of the evaporator drops to the cut-off temperature, the car air conditioner turns off the compressor and stops cooling to prevent the evaporator from frosting. And when the temperature of the evaporator rises to the suction temperature, the vehicle air conditioner suction compressor contin...

AI Technical Summary

Problems solved by technology

If we only judge whether the evaporator is frosted based on a fixed temperature point of the evaporator and control it accordingly, we will definitely not be able to achieve the purpose of accurately controlling the vehicle air conditioner. It may cause the evaporator to frost and the compressor has stopped working, causing the compressor to be switched on and off frequently, the outlet air temperature fluctuates, the air conditioner cannot perform at its maximum performance, the cooling effect of the vehicle is not good, and the compression of the car air conditioner will also be reduced machine and electrical system life

In addition, it is also possible that the evaporator has been frosted and the compressor has not stopped working, which will cause the cooling effect of the car air conditioner to become worse and worse until it cannot be refrigerated.

Images