Controller of vehicle air conditioner and controlling method thereof

Abstract

The invention discloses a controller of a vehicle air conditioner and a method for controlling the vehicle air conditioner and relates to the field of a vehicle support equipment manufacturing technology; the controller comprises a microcomputer controller for controlling the air conditioner, a PTC (Positive Temperature Coefficient) heating element, a draught fan for supplying wind to the PTC heating element and a compressor for refrigeration; the microcomputer controller includes three power regulation transistors for respectively controlling the draught fan and the compressor, and the output ends of the transistors are respectively connected with the input ends of the transistors, so that pulse width-modulated signals are provided to said three power regulation transistors; the controlling method is characterized in that a pulse width-modulated signal which is gradually increased in duty ratio is provided to the power regulation transistor by the microcomputer controller, so that the starting current of the PTC heater is steadily increased. The controller can solve the problem that an ordinary relay contact is difficult to bear because the PTC heater is relatively large in initial starting current, and the system is affected in operating steadiness and reliability or collapsed because the power system of the vehicle is impacted due to large current.

Description

technical field [0001] The invention relates to the technical field of manufacturing automobile supporting equipment, in particular to a vehicle air conditioner controller and a control method for electric vehicles. Background technique [0002] At present, most of the car air conditioners on the market use PTC heating elements to provide heat sources when heating. PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient, and generally refers to semiconductor materials or components with a large positive temperature coefficient. The PTC heating element made of this semiconductor material has a low resistance value at room temperature, and its resistance value increases stepwise as the temperature rises. Therefore, this kind of PTC heater has the characteristics of small size, fast heating, high thermal efficiency, and automatic constant temperature. However, it is precisely because of this positive temperature coefficient that...

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Problems solved by technology

[0005] The above-mentioned tasks of the present invention are all to solve the problem that the initial start-up current of the PTC heater is large, the general relay contacts are difficult to bear, and the power system of the automobile is impacted by a large current, so that the stability and reliability of the system are affected or even collapsed. question

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