Steering force control system for power steering
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United States of America Patent
Stats
-
Dec 8, 1992
Grant Date -
N/A
app pub date -
Apr 17, 1991
filing date -
Apr 19, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A subpump has its discharge flow rate increased in response to an increase in a vehicle speed. A variable throttle is disposed in a discharge passage from the subpump, and an oil pressure taken from the upstream side of the variable throttle is introduced into a hydraulic reaction chamber to produce a steering action. A main pump has its flow rate increased or decreased in accordance with a number of revolutions thereof, and feeds a pressure oil to a power steering control valve through a passage in which a fixed restriction is disposed. An oil pressure which prevails upstream of the fixed restriction acts upon the variable throttle to change its area of opening, thereby controlling the steering force.
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