Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-02-07
1993-03-23
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 87, 303 11, 303DIG5, B60T 1314
Patent
active
051958104
ABSTRACT:
An anti-lock hydraulic brake system is described having a bypass line to a pump used to evacuate and pressurize the wheel brakes during antilock control. A pressure control valve in the bypass line regulates the pressure in the pressure line to the master cylinder pressure level. A low pressure accumulator absorbs recirculated fluid flow from the bypass line. A pressure operated valve opens only when a difference in pressure between the master cylinder pressure and the pump outlet pressure line pressure develops. The consequence is that a non-return valve a and pressure operated valve in combination bring about isolation of the master cylinder during antilock control to prevent brake pedal reaction to pump pressure developed during a braking pressure control operation. When the accumulator is fully charged, the bypass line is closed by means of a shut-off valve operated by an accumulator piston so that the pump delivers fluid via the pressure valve (18) back into the master cylinder (1).
REFERENCES:
patent: 4844558 (1989-07-01), Ishii et al.
patent: 4892364 (1990-01-01), Burgdorf
patent: 4919495 (1990-04-01), Kircher et al.
patent: 5013097 (1991-05-01), Gutzeit et al.
patent: 5058961 (1991-10-01), Mergenthaler et al.
Ocvirk Norbert
Remfrey James
Weise Lutz
Alfred Teves GmbH
Butler Douglas C.
Lewis J. Gordon
Muratori Alfred
Seitter Robert P.
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