Hydraulic power steering system with input detection capability

Details Hydraulic power steering system with input detection capability Hydraulic power steering system with input detection capability

1993-03-10

1994-07-19

Bertsch, Richard A.

Power plants

Pressure fluid source and motor

Expansible chamber type volumetric responsive measuring...

60452, 60477, F16D 3102

Patent

active

053297660

ABSTRACT:
A hydrostatic power steering system is provided of the type including a steering control unit (3) operated by an input such as a steering wheel (1) to control flow from a source (8) to a steering cylinder (7). The source is operated in response to an electrical signal from a controller (82), controlled by a sensed pressure at a pressure detection port (64). The pressure at the port (64) is communicated from the main fluid path of the steering control unit (3), downstream of the fluid meter (18) when the spool (21) and sleeve (22) are relatively displaced. In systems in which the system reservoir (R) is at an elevated ("regulated tank") pressure, the pressure detection circuit is drained through a variable orifice (70) to a drain port (66), which is in communication with a sump (S) maintained at substantially atmospheric pressure. As a result, the steering system responds at a lower steering pressure, and the initial steering is smoother.

REFERENCES:
patent: 3423934 (1969-01-01), Mercier
patent: 4730544 (1988-03-01), Jorgensen
patent: 5065793 (1991-11-01), Stephenson et al.

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