Patent ID: 6114775
Filing Date: 2000-09-05
Classification: B60K,B60L,B60W,Y02T,Y10S

Abstract:
In a control system of an auxiliary power system for a hybrid electric vehicle which includes: an engine; a generator driven by the engine; a battery charged by an output current of the generator; and a load driven by both the generator and the battery, the control system comprising:a rectifier which converts three-phase AC power generated from the generator to DC power;a smoothing circuit for smoothing the DC power;a contactor on switching the DC power applied to both the battery and the load;a fuel quantity sensor which senses fuel quantity, converts the sensed fuel quantity to a fuel quantity control signala battery charging monitoring sensor which checks a charging state of the battery and provides a related control signal anda first shunt circuit which detects an output current of the rectifier, outputs a control signal related to the detected output current, and continuously transmits the DC power from the rectifier to the load via the smoothing circuit:a second shunt circuit which detects the power applied from the contactor to the battery, and outputs a control signal related to the detected battery currenta main control circuit which senses signals from and controls and auxiliary power system; andan engine constant-speed control portion which controls the engine at a constant speed by detecting an engine throttle position signal and an engine rpm signal, and controls engine rpm and an on/off state of the engine by signal communication with the main control circuit.