Electric vehicle air conditioning system intelligent control method based on human body thermal comfort theory and fuzzy PID control

Abstract

The invention relates to an electric vehicle air conditioning system intelligent control method based on a human body thermal comfort theory and fuzzy PID control, and belongs to the technical field of full vehicle thermal management. The method comprises the following steps that, S1, an automobile air conditioning system and passenger cabin coupling thermal model is established, and based on thecoupling thermal model, a fuzzy PID controller is established by taking the temperature of the automobile passenger cabin as a control target and taking the rotating speed of an electric compressor asa control variable; S2, an estimator with respect to a current PMV value in the passenger cabin is established based on the human body thermal comfort theory; S3, a memory storage device with respectto the driver temperature adjustment is established, and an average PMV value preferred by a driver recently is calculated; and S4, the real-time control target temperature T<comfort> is calculated,and the temperature of the passenger cabin is adjusted by using the established fuzzy PID controller so as to realize real-time self-adjustment of the comfort temperature of the passenger cabin. The method is simple and effective, short in control time and strong in robustness, and is suitable for being used in a real vehicle air conditioner control system.

Description

Technical field [0001] The invention belongs to the technical field of vehicle thermal management, and relates to intelligent automatic control of an electric vehicle air-conditioning system with a driver's thermal habit adaptive function based on human thermal comfort theory and a fuzzy PID control method. Background technique [0002] As one of the most important auxiliary systems of automobiles, automobile air conditioning systems are driven by the development trend of electrification and intelligence in the automobile industry, requiring more precise and intelligent controllers to adjust the thermal balance of the passenger compartment. For electric vehicles, the car air conditioning system is the most energy-consuming auxiliary system. Relevant studies have shown that the energy consumption of the electric car air conditioning system will reduce the battery life of the electric car by an average of 30%-40%. In terms of thermal comfort, due to the demand for intelligent devel...

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Problems solved by technology

However, the thermal comfort theory based on the PMV value is not applicable to different regions, different body types, different genders, and ages, which also limits the use of this theory in automotive air conditioners.

There are also many theoretical improvement methods for thermal comfort, but how to specifically apply it to automotive air conditioners and adapt to the driver's thermal comfort method has not yet appeared.

[0005] At present, the method of adding PMV adaptation function to the automobile air-conditioning control, and using the PMV value to adapt to the driver's comfort needs to realize the automatic adjustment of the comfortable temperature of the air-conditioning system has not yet appeared.

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