VARIABLE DISPLACEMENT PUMP
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United States of America Patent
Stats
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N/A
Issued Date -
Aug 9, 2012
app pub date -
Nov 29, 2011
filing date -
Feb 7, 2011
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A variable displacement pump includes a pumping part and a cam ring for supplying working fluid to a vehicle steering device. The cam ring is arranged radially outside of the pumping part, and configured to move along with a change in eccentricity of the cam ring, wherein the change in eccentricity causes a change in specific discharge rate. A solenoid is configured to control the eccentricity of the cam ring by being driven with an energizing current conformed to a control setpoint. A base setpoint is calculated based on steering angular speed and vehicle speed. The control setpoint is calculated based on the base setpoint and steering angular acceleration in a manner that the control setpoint increases more quickly than the base setpoint when the base setpoint increases in accordance with steering operation of the steering wheel.
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