Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1993-10-12
1994-12-06
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
188170, 188151A, 303 15, 303 71, 303 976, B60T 1322
Patent
active
053704495
ABSTRACT:
A parking brake system is provided which includes a dual solenoid operated valve located in series with the emergency brake control valve of a hydraulically operated brake system. The dual solenoid valve is operable to either one of two mechanical detent positions so that positioning of the valve is retained in the event of loss of power. The dual solenoid valve is controlled by the vehicle operator from the transmission console and removes fluid pressure from the brakes when actuated to a PARK position. An electronic control unit is provided for sensing the speed of the vehicle and the pressure in the hydraulic line to the brakes and provides a PARK enabling signal when the vehicle speed is below a predetermined amount. When a gear is selected at the console the dual solenoid valve is actuated to a position permitting fluid pressure to be applied to the brakes and effectively returns control of the brakes to the emergency brake control device. A pressure sensor is provided in the line to the brakes and is used to provide feedback to the driver and to control transmission shifting.
REFERENCES:
patent: 4068899 (1978-01-01), Nolte et al.
patent: 4307916 (1981-12-01), Straut et al.
patent: 4339154 (1982-07-01), Duttarer et al.
patent: 4346943 (1982-08-01), Leiber
patent: 4349233 (1982-09-01), Bullard et al.
patent: 4824178 (1989-04-01), Petersen
patent: 5090780 (1992-02-01), Powell
Watch #105, Felsted Park Brake Shifter, Aug. 29, 1991.
Edelen Stephen A.
Jones Robert W.
Butler Douglas C.
Eaton Corporation
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