Motor-driven power steering system having a stable output torque

Details Motor-driven power steering system having a stable output torque Motor-driven power steering system having a stable output torque

1984-08-08

1986-09-30

Nilson, Robert G.

Motor vehicles

Compensating devices

318434, 318488, 361 31, B62D 504, G05D 1702

Patent

active

046142487

ABSTRACT:
An electric motor driven power steering system is provided. The motor is prevented from operating at low torque command levels. After a first predetermined level of command torque is reached, the motor is controlled to generate torque at a predetermined rate less than the torque actually commanded by the vehicle driver. After a second predetermined level of commanded torque is reached, the motor is controlled to generate torque in accordance with the level of torque command. Thus, the phenomenon known as "hunting" and instability of the system at low torque levels are virtually eliminated. The system operates smoothly over its full range of operation and is not affected by rough road surface conditions.

REFERENCES:
patent: 3983953 (1976-10-01), Bayle
patent: 4066945 (1976-03-01), Korte, Jr.
patent: 4246622 (1981-01-01), Hosoda
patent: 4290000 (1981-09-01), Sun
patent: 4300081 (1980-03-01), Van Landingham
patent: 4415054 (1983-11-01), Drutchas
patent: 4471280 (1984-09-01), Stack
patent: 4530413 (1985-07-01), Buike
patent: 4532567 (1985-07-01), Kade

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