Bootstrap power steering systems

Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage

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Details

418 26, 418 27, F04B 4908

Patent

active

054356989

ABSTRACT:
Methods and devices for enhancing bootstrap hydraulic systems for use in vehicular power steering systems are disclosed. Improved pressure dividing networks are provided for enabling balanced operation of supply pressure control function when valve input shaft and sleeve are in relative centered positions or for enabling a first method of providing speed sensitive control of steering assist. Control valves utilizing a combination of open-center and closed-center flow control orifices are provided for reducing parasitic pressure losses. An improved variable displacement pump is provided for enabling volumetric flow rate efficient operation of bootstrap systems. A vehicular speed dependent command signal for a servo motor powered bootstrap hydraulic system is utilized in another method of providing speed sensitive control of steering assist. Control valves using parasitic and bypass slots having decreasing overall flow resistance over a meaningful portion of nominally closing motion of a host control valve are disclosed wherein methods of providing nominally linear control valve pressure-effort characteristics of the meaningful portion of nominally closing motion of the host control valve are comprised. Finally, various power steering systems utilizing selected combinations of these methods and devices for enhancing bootstrap hydraulic systems are disclosed.

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patent: 4678412 (1987-07-01), Dantlgraber

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