Fail-safe means for electrical power steering

Details Fail-safe means for electrical power steering Fail-safe means for electrical power steering

1989-09-18

1990-11-20

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318293, 318432, 180142, 180 791, 361 23, B62D 504

Patent

active

049721330

ABSTRACT:
A fail-safe arrangement for an electrical power steering system is directed to providing a control arrangement for a power steering motor which will prevent abnormal operation from having adverse impact. The control system detects the welding or sticking together of closed relay contacs and functions to prevent such a situation by monitoring the motor terminal voltage so as to cut off power above a predetermined value regardless of position of the relay contacts.

REFERENCES:
patent: 4518055 (1985-05-01), Yagi et al.
patent: 4538698 (1985-09-01), Hashimoto et al.
patent: 4651840 (1987-03-01), Shimizu et al.
patent: 4715463 (1987-12-01), Shimizu
patent: 4719396 (1988-01-01), Shimizu
patent: 4735271 (1988-04-01), Shimizu
patent: 4754829 (1988-07-01), Shimizu
patent: 4765426 (1988-08-01), Shimizu
patent: 4819170 (1989-04-01), Shimizu
patent: 4834201 (1989-05-01), Miyazaki et al.

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