Apparatus for controlling steering power in power steering system
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United States of America Patent
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-
Oct 4, 1988
Grant Date -
N/A
app pub date -
Feb 9, 1987
filing date -
Jun 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A power steering system is hydraulically operated to decrease the manual steering force in response to the steering wheel angular displacement. A main pump supplies a first hydraulic fluid to the power steering system to operate the same. The main pump is hydraulically coupled to the power steering system so that the pressure of the first hydraulic fluid is affected by the operation of the power steering system and therefore is indicative of the steering wheel angular displacement. A reaction chamber receives a second hydraulic fluid from a subpump and is hydraulically operated to increase the steering force in proportion to the pressure of the second hydraulic fluid. A first control valve is disposed between the subpump and reaction chamber for increasing the second hydraulic fluid pressure applied to the reaction chamber in response to the vehicle speed, and a second control valve is disposed between the subpump and reaction chamber for increasing the second hydraulic fluid pressure applied to the reaction chamber in response to the first hydraulic fluid pressure indicative of the steering wheel angular displacement.
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