DC motor driven power steering system for a motor vehicle

Details DC motor driven power steering system for a motor vehicle DC motor driven power steering system for a motor vehicle

1997-09-05

2000-10-31

Sircus, Brian

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388806, 318432, 318799, 318805, H02P 517

Patent

active

061414948

ABSTRACT:
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.

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patent: 5378975 (1995-01-01), Schweid et al.
patent: 5460235 (1995-10-01), Shimizu
patent: 5652487 (1997-07-01), Nishino et al.
patent: 5786679 (1998-07-01), Nishino et al.

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