Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-06-30
2000-02-15
Schwartz, Chris
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031192, B60T 802, B60T 848
Patent
active
060244232
ABSTRACT:
A braking system includes a wheel brake, a master cylinder, and a modulator interposed in the braking system and interconnected with the wheel brake and the master cylinder so that fluid pressurization effected in the braking system by the master cylinder is communicated to the wheel brake through the modulator. An isolation valve is positioned in the modulator normally permitting an unrestricted fluid flow and pressure exchange between the master cylinder and the wheel brake through the modulator. The isolation valve is operable to isolate the wheel brake from the master cylinder by the repositioning of a moveable element in the isolation valve. A solenoid valve is associated with the modulator and is normally closed. The solenoid valve is openable so that fluid pressure is released from the wheel brake through the solenoid valve and substantially simultaneously, the moveable element of the isolation valve moves to close the isolation valve to isolate the wheel brake from the master cylinder. A flow regulating valve is positioned in the modulator and has a compensating piston that automatically moves to provide a substantially consistent flow rate through the flow regulating valve wherein the flow regulating valve has an upstream side that receives fluid pressure and a downstream side that is in fluid communication with the solenoid valve wherein the solenoid valve is sized to accept fluid flow during an ABS release cycle from both the wheel brake to reduce fluid pressure therein and from the flow regulating valve so that flow through the flow regulating valve does not increase fluid pressure at the wheel brake. Additionally, the flow regulating valve supplies fluid to the wheel brake during an ABS apply cycle at a tuned flow rate.
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patent: 4691969 (1987-09-01), Maehara
patent: 5066075 (1991-11-01), Kaneda et al.
patent: 5538336 (1996-07-01), Reuter et al.
patent: 5590936 (1997-01-01), Reuter
patent: 5607208 (1997-03-01), Reuter et al.
patent: 5618086 (1997-04-01), Reuter
General Motors Corporation
Schwartz Chris
Sigler Robert M.
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