Patent ID: 6651761
Filing Date: 2003-11-25
Classification: B60L,H01M,Y02E,Y02T

Abstract:
A temperature control system for a fuel cell vehicle having a fuel cell system and a plurality of electronic components, the fuel cell system and the electronic components each having optimal temperature operating limits, comprising:sensors to determine temperature of the fuel cell system; sensors to determine temperature of each of the electronic components; a cooling system including a high temperature cooling circuit to cool the fuel cell system, and a low temperature cooling circuit to cool the electronic components, the cooling system further including a variable speed fan for cooling coolant flowing in the high and low temperature cooling circuits and a variable position radiator bypass valve for controlling the flow of coolant in the high temperature cooling circuit; and a controller to simultaneously and separately control a high temperature cooling circuit and the low temperature cooling circuit to maintain optimal operating temperature limits of both the fuel cell system and the electronic components, the controller including overshoot and undershoot compensation based on controller preset actions and a logic circuit for coordinating the operation of the fan with the operation of the bypass valve such that fan speed is a function of the operating position of the bypass valve.