Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1997-10-06
1999-04-20
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 15, 3031152, 303189, B60T 848
Patent
active
058950982
ABSTRACT:
A control method for a manual back-up electro-hydraulic braking system in which the rear service brakes of the vehicle are intentionally operated in a manual back-up mode under specified non-failure operating conditions to conserve electrical energy. The manual back-up mode for the rear service brakes is initiated if braking is commenced while the vehicle speed is below a near-zero threshold speed. If braking is commenced above the threshold speed, the manual back-up mode for the rear service brakes is initiated when the vehicle speed falls below the threshold and the pressure command for the rear brakes has been substantially constant for at least a predetermined time. In this case, the rear manual back-up mode is initiated by reducing the rear brake pressure command to the rear boost units at a controlled rate until the rear brake pressure reaches the manually developed pressure, and then entering the manual back-up mode. Once the rear manual back-up mode is initiated, it remains in effect until the driver releases the brake pedal.
REFERENCES:
patent: 4934761 (1990-06-01), Sauvageot et al.
patent: 5246283 (1993-09-01), Shaw et al.
patent: 5362135 (1994-11-01), Riddiford et al.
patent: 5573312 (1996-11-01), Muller et al.
Groult Xavier Marie
Stacey Scott Alan
Veron Bernard Claude
General Motors Corporation
Graham Matthew C.
Siconolfi Robert
Simon Anthony Luke
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