DC MOTOR DRIVEN POWER STEERING SYSTEM FOR A MOTOR VEHICLE

• Main Authors: WADA, SHUNICHI, SWA, HIROHISA, NISHINO, KAZUHISA
• Format: Patent
• Language: English; Korean
• Published: 15.04.1999
• Edition: 6
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MOTOR VEHICLES; PERFORMING OPERATIONS; TRAILERS; TRANSPORTING

차량용 직류모터구동파워 조향장치는, 직류모터를 흐르는 모터전류를 검출하는 모터전류검출회로와 브리지회로에 인가된 전원전압을 검출하는 전원전압검출회로와, 브리지회로에 인가된 전원전압 및 브리지회로를 제어하기 위해 사용되는 PWM제어신호에 따라 직류모터 양단에 인가된 전압을 추정하는 모터전압추정수단과, 모터전류 및 직류모터에 인가된 추정모터전압에 의거 모터의 회전상태를 검출하는 모터회전검출수단으로 구성되어 있어, 직류모터의 회전상태를 검출하는 데 있어 고신뢰성이 보장된다. A DC motor driven power steering system for a motor vehicle includes a motor current detection circuit for detecting a motor current flowing through the DC motor, a power supply voltage detection circuit for detecting a power supply voltage applied to the bridge commutation circuit, a motor voltage estimating unit for estimating a voltage applied across the DC motor on the basis of the power supply voltage applied to the bridge commutation circuit and the pulse-width modulated control signals used for controlling the bridge commutation circuit, and a motor rotation detecting means for detecting the rotation state of the DC motor on the basis of the motor current and the estimated motor voltage applied to the DC motor. High reliability can be ensured for detection of the rotation state of the DC motor.