Motor vehicles – Steering gear – With fluid power assist
Reexamination Certificate
2006-10-24
2006-10-24
Morris, Lesley D. (Department: 3611)
Motor vehicles
Steering gear
With fluid power assist
C180S421000
Reexamination Certificate
active
07124855
ABSTRACT:
A flow controlling apparatus for a power steering system includes a variable throttle mechanism installed in the pump to change the flow rate of discharged oil from the pump to a hydraulic device; a linear solenoid mechanism controlling the variable throttle mechanism by a predetermined energizing current; a spool feeding back the excess discharged oil to a bypass passage of the pump in accordance with a differential pressure between the upstream and downstream sides of the variable throttle mechanism when the excess fluid exceeds a predetermined value; and an ECU controlling the energized current to change the transition process in accordance with a steering angular velocity of the steering wheel.
REFERENCES:
patent: 4557342 (1985-12-01), Drutchas
patent: 4576003 (1986-03-01), Rau et al.
patent: 5207239 (1993-05-01), Schwitalla et al.
patent: 5508919 (1996-04-01), Suzuki et al.
patent: 6179082 (2001-01-01), Ikari
patent: 1108638 (2001-06-01), None
patent: 1331156 (2003-07-01), None
patent: 2001260917 (2001-09-01), None
Morris Lesley D.
Toyoda Koki Kabushiki Kaisha
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