Fail safe method and system for motor driven power steering appa

Details Fail safe method and system for motor driven power steering appa Fail safe method and system for motor driven power steering appa

1987-06-12

1988-04-12

Pekar, John A.

Motor vehicles

Compensating devices

B62D 504

Patent

active

047368101

ABSTRACT:
A fail safe system for a motor driven power steering apparatus comprises a DC motor for subsidiarily energized said steering apparatus; a handle for receiving steering rotary force to produce a corresponding steering torque; a torque sensor for producing a signal corresponding to said rotary force applied to said handle, said torque sensor comprising a potentiometer having a movable electrode for detecting a torsional angle owing to said steering torque and a torque neutral region sensor arranged to operate together with said movable electrode for detecting a neutral region of said steering torque to produce a signal indicating whether said steering torque is within said torque neutral region or not; a motor current detection circuit for detecting a current flowing in said DC motor; an electromagnetic clutch for coupling/decoupling an output of said DC motor to/from said steering apparatus; a power supply circuit for supplying electric power to said DC motor and said electromagnetic clutch; and a fail safe relay provided with a normally opened contact connected in series in said power supply circuit; said fail safe relay being interrupted to remove said subsidiary steering force when a larger current exceeding said torque neutral region flows in said motor-current detection circuit while said torque neutral region sensor produces the signal indicating that said steering torque is within said torque neutral region.

REFERENCES:
patent: 3739738 (1973-06-01), Cavil
patent: 4573545 (1986-03-01), Kalns
patent: 4621327 (1986-11-01), Dolph et al.

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