Hydraulic Servo-Steering Device and Method for Controlling a Pump Drive Motor
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United States of America Patent
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Issued Date -
Aug 27, 2009
app pub date -
Jul 19, 2006
filing date -
Sep 7, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A hydraulic servo-steering device includes a pump and a pump drive motor. At least one defined high power stage (C) and one defined low power stage (B) are provided in which the motor is selectively operated. Moreover, a defined additional power stage (A) is provided for the motor, in which the speed of the motor is reduced with respect to the low power stage (B). According to a method for controlling the pump drive motor of the hydraulic servo-steering device, the motor is operated in the additional power stage (A) under certain conditions which rule out an impairment to driving safety.
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