B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
B60T 7/12 (2006.01) B60T 13/22 (2006.01) B60T 13/68 (2006.01) F16H 63/48 (2006.01) F16H 59/74 (2006.01)
Patent
CA 2133778
A parking brake system is provided which includes a dual solenoid operated valve (20) located in series with the emergency brake control valve (18) of a hydraulically operated brake system. The dual solenoid valve is operable to either one of two mechanical detent positions (38) 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 (40) and removes fluid pressure from the brakes when actuated to a PARK position. An electronic control unit (46) 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 (48) is provided in the line (16) to the brakes and is used to provide feedback to the driver and to control transmission shifting.
Edelen Stephen A.
Jones Robert W.
Borden Ladner Gervais Llp
Corporation Eaton
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