Electric power steering device having a clutch

Details Electric power steering device having a clutch Electric power steering device having a clutch

1989-04-05

1990-09-25

Chin, Gary

Boots, shoes, and leggings

180 791, 180142, B62D 504

Patent

active

049597876

ABSTRACT:
An electric power steering device having a clutch 25 for connecting and disconnecting the motor 14 to and from the steering shaft is disclosed, the control circuit of which comprises, in addition to a microcomputer 3, an additional analog direction determiner circuit 17, and a first and a second logical circuit. The first logical circuit consists of a pair of AND gates 20A, 20B generates a final right or left direction signal supplied to the motor driver circuit. The second logical circuit consists of a pair of exclusive OR gates 21A, 21B and an AND gate 22 and supplies a deenergization signal to the clutch driver when the directions determined by the microcomputer and the analog direction determiner circuit disagree. The direction determiner circuit includes: a first comparator 31 which outputs a right direction signal when the output voltage of the torque sensor exceeds a first reference level; and a second comparator 32 which outputs a left direction signal when the output voltage of the torque sensor is below a second reference level which is lower than the first level. These reference voltages, selected at upper and lower ends of the non-sensitive region, may be obtained by a voltage divider.

REFERENCES:
patent: 4573545 (1986-05-01), Kalns
patent: 4621327 (1986-11-01), Dolph et al.
patent: 4736810 (1988-04-01), Morishita et al.
patent: 4798253 (1989-01-01), Naito
patent: 4799566 (1989-01-01), Shimizu
patent: 4881611 (1989-11-01), Nakashima et al.

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