A current control system for an externally controlled solenoid valve of an automobile air conditioner

Abstract

The invention discloses an automobile air conditioner external control electromagnetic valve electric current control system. The automobile air conditioner external control electromagnetic valve electric current control system comprises a CAN receiving and sending module, a microprocessor module, an output driving and feedback electric current sampling module and a feedback electric current processing and sampling module. The first data transmission end of the CAN receiving and sending module is connected with the first input end and the first output end of the microprocessor module, and the second data transmission end of the CAN receiving and sending module is connected with an external control circuit. The second input end of the microprocessor module is connected with the output end of the feedback electric current processing and sampling module, the third input end of the microprocessor module is connected with the first output end of the output driving and feedback electric current sampling module, and the second output end of the microprocessor module is connected with the input end of the output driving and feedback electric current sampling module. The second output end of the output driving and feedback electric current sampling module is connected with the input end of the feedback electric current processing and sampling module, and the third output end of the output driving and feedback electric current sampling module is connected with an external control electromagnetic valve. According to the automobile air conditioner external control electromagnetic valve electric current control system, an electric current of the external control electromagnetic valve can be precisely controlled, the control process is simple and effective, and the reliability is high.

Description

Technical field [0001] The invention belongs to the technical field of automobile control, and specifically relates to a current control system for an external control solenoid valve of an automobile air conditioner. Background technique [0002] At present, people have higher and higher requirements for the safety of automobiles and the degree of intelligence of automobiles. In the design of air-conditioning systems, most of the air-conditioning compressors used in automobiles are internally controlled variable displacement compressors. Directly connected to the engine, for the fixed-displacement compressor automotive air conditioning system, the evaporator air temperature is used to control the compressor electromagnetic clutch to engage or disengage, and the intermittent operation is used to control the cooling capacity of the system to adapt to the air conditioning load in the car. In addition to the shortcomings of this control method, such as large fluctuations in the tempe...

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Problems solved by technology

In addition to the disadvantages of this control method, such as large fluctuations in the temperature of the air conditioner in the car, and irreversible losses caused by frequent system startup and shutdown, which increase the energy consumption of the system, the biggest problem is that the periodic clutching of the compressor will cause interference to the car engine.

In order to solve this problem, people have developed an external capacity control valve to realize the precise and intelligent adjustment and control of the externally controlled variable displacement compressor. However, the existing control of the externally controlled solenoid valve adopts mechanical control, and its current changes are jumping changes. , is not continuous, that is, it is impossible to achieve precise control of the current of the external control solenoid valve

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