Vehicle air conditioning control system

Abstract

Provided is a vehicle air conditioning control system, comprising an evaporimeter temperature deviation calculation unit, an integral control unit for calculating an integral value based on an evaporimeter temperature deviation and an output value calculation unit for calculating a request compressor output value based on the integral value and restraining the request compressor output value to calculate a compressor output value. When the request compressor output value is restrained, the integral control unit stop integral control; when the request compressor output value is restrained by a lower limit, the integral control unit does not stop integral control if the evaporimeter temperature deviation is smaller than zero; and when the request compressor output value is restrained by an upper limit, the integral control unit does not stop integral control if the evaporimeter temperature deviation is smaller than zero. Thereby to determine whether or not integral control is performed when a requested compressor output value is limited by an upper or lower limit, based on an evaporator temperature deviation, prevent divergence of an integral value, and make an evaporator temperature follow a target evaporator temperature during the integral control.

Description

technical field [0001] The present invention relates to a vehicle air conditioner control system, and more particularly to a vehicle air conditioner control system capable of controlling cooling performance of, for example, an electric compressor or an external variable displacement compressor by using a controller. Background technique [0002] In the case of an air conditioning control system for a vehicle that uses a control unit (also referred to as an "A / C controller") to set a target value for, for example, an electric compressor or an external variable displacement compressor to operate the compressor, the use of Feedback control of PI (Proportional Integral) control, and in order to make the evaporator temperature close to the target evaporator temperature, change the output value (the rotation speed of the electric compressor or the requested swash plate inclination of the external variable displacement compressor ( Also called "duty")). [0003] As related technic...

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Problems solved by technology

[0006] However, as a result of the vehicular air-conditioning control system stopping the integral control, inconveniently, when the restriction is released later, it takes an excessively long time to follow the target value

[0007] In addition, in the case where integral control does not cause damage, such as performing integral control to decrease the output value when the output value is limited by the upper limit or performing integral control to increase the output value when the output value is limited to the lower limit, it cannot Narrows the difference between the target evaporator temperature and the evaporator temperature, i.e., inconveniently creates a problem of constant instability of the control

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