Self-check method of four-wheel steering drive system

Details Self-check method of four-wheel steering drive system Self-check method of four-wheel steering drive system

1989-05-11

1990-10-02

Black, Thomas G.

Boots, shoes, and leggings

36442403, 180 791, 180142, B62D 500

Patent

active

049611445

ABSTRACT:
In a self-check method of a four-wheel steering drive system, a relay downstream current upon ON/OFF of a relay is checked to check a state of said relay. Forward and reverse rotation control signals of a duty ratio of 0% are supplied to a predetermined combination of switching elements constituting an H bridge circuit to check if a current obtained from the predetermined combination of switching elements is an overcurrent, thereby checking a state of the H bridge circuit. When the rear wheels are turned to a target rear wheel position with reference to a present rear-wheel position, whether or not a difference between the target rear-wheel position and an actual rear-wheel position is set to be a predetermined value or less within a predetermined period of time is checked, thereby checking a state of a steering motor and a rear-wheel steering mechanism.

REFERENCES:
patent: 4621327 (1986-11-01), Dolph et al.
patent: 4660671 (1987-04-01), Behr et al.
patent: 4745514 (1988-05-01), Takeshima et al.
patent: 4869334 (1989-09-01), Marumoto et al.

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