Hydrostatic vehicle drive system having improved control thereof

Details Hydrostatic vehicle drive system having improved control thereof Hydrostatic vehicle drive system having improved control thereof

1998-09-08

2000-05-16

Ellis, Christopher P.

Motor vehicles

Power

Including traction motor of kind driven by noncompressible...

180307, 180308, 180 63, 180417, 180421, 180422, B60K 17356

Patent

active

060623322

ABSTRACT:
A method of controlling a vehicle hydraulic drive system of the type including a plurality of fluid pressure actuated wheel motors (13,15) connected in a parallel circuit with a source (17) of pressure. A flow restrictor valve (65) is disposed in a downstream conduit (27) of each of the wheel motors (13,15). The method involves determining the theoretical fluid flow for each motor, the actual fluid flow through each motor, and generating an error signal (107) which is then used to bias the restrictor valve (65) toward a flow restriction position. The disclosed method can be used to achieve steering at greater than kinematic, by scrubbing the inside front wheel, or can be used to prevent wheel slip of propulsion wheels, or can be used to prevent scrubbing of a wheel during hydrostatic braking, or can even be used to achieve vehicle steering.

REFERENCES:
patent: 3915068 (1975-10-01), Gassman
patent: 4914592 (1990-04-01), Callahan et al.
patent: 5147010 (1992-09-01), Olson et al.
patent: 5427195 (1995-06-01), Paul et al.
patent: 5715664 (1998-02-01), Sallstrom et al.
patent: 5720360 (1998-02-01), Clark et al.

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