Patent ID: 6016966
Filing Date: 2000-01-25
Classification: B60H

Abstract:
An air conditioning system for controlling the temperature of a passenger compartment in a vehicle, comprising:a blower device directing an air flow toward said passenger compartment;a heat exchanger for exchanging heat with said air flow generated by said blower device;a pump driven by an engine for circulating an engine coolant therethrough;a fluid passageway for passing said engine coolant therethrough serially connecting said engine, said pump and said heat exchanger;a valve disposed in said fluid passageway for controlling said engine coolant flowing toward said heat exchanger;a sensor device disposed adjacent to said heat exchanger means for sensing an air temperature of said air flow through said heat exchanger and generating an electrical sensor signal indicative thereof;a temperature selector for selecting a target temperature of said air flow through said heat exchanger means and generating an electrical set signal indicative thereof;a feed-forward control based on said electrical sensor signal and said electrical set signal, wherein said feed-forward control includes a feed-forward algorithm which calculates a first feed forward signal based on a deviation between said electrical sensor signal and said electrical set signal; anda control circuit for controlling an opening of said valve by integrating said feed-forward control and a feed-back control based on said electrical sensor signal and said electrical set signal.