Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2006-10-19
2009-12-01
Dickson, Paul N (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S442000, C180S417000, C180S421000, C180S422000, C701S044000
Reexamination Certificate
active
07624837
ABSTRACT:
In a hydraulic power steering apparatus, hydraulic pressure for generating steering assist power is varied by varying opening of a variable throttle portion by movement of a spool. The spool is disposed in a provisional origin by driving a stepping motor in one direction according to a number of steps for setting provisional origin from a position at a time of start of control, and the number of steps at a time of completing of the driving is set to a provisional origin for calculation. In a return to origin permission state where the spool is disposed in a provisional origin and the number of steps from the provisional origin for calculation is zero, a number of steps at a time when the driving of the stepping motor according to a number of steps obtained by subtracting the number of steps for setting provisional origin from a number of steps for setting origin is completed is set to an origin for calculation, and the movement of the spool is stopped at the origin with a stopper. After setting the origin for calculation, a number of steps from the origin for calculation instead of the provisional origin for calculation is set according to the vehicle driving condition for positioning the spool.
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Dickson Paul N
Jordan and Hamburg LLP
JTEKT Corporation
Yeagley Daniel
LandOfFree
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