Power plants – Pressure fluid source and motor – Condition responsive control of or by input to input pump...
Patent
1996-02-21
1998-05-26
Michalsky, Gerald A.
Power plants
Pressure fluid source and motor
Condition responsive control of or by input to input pump...
60450, 60468, 91375A, F15B 904, F15B 910
Patent
active
057550972
ABSTRACT:
Methods and apparatus for improving control of pressurized fluid flow through bootstrap power steering systems are disclosed. In particular, the methods include differentially measuring control pressure across internal flow control orifices as directly as possible. Differential control pressure measurements are made between Kelvin supply, or return, pressure values and a control pressure port of a control valve. In addition, methods and apparatus for improved speed sensitive control of steering assist and/or driver selectable steering effort are also disclosed. One of the methods comprises an extension of the method of differentially measuring control pressure across the internal flow control orifices wherein a range of control pressures are enabled. In addition, a method of improving low speed tactile steering feel wherein an electronically variable orifice is activated in order to provide additional fluid flow thereby increasing "on-center" hydraulic pressure gain is disclosed.
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Michalsky Gerald A.
Techco Corporation
LandOfFree
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