Patent ID: 6709069
Filing Date: 2004-03-23
Classification: B60T,F16H,Y10S,Y10T

Abstract:
A brake by wire system for a motor vehicle having a transmission with a park mode in which vehicle operational motion is prevented and a drive mode in which vehicle operational motion is allowed and a brake solenoid transmission interlock unit effective to prevent release of the vehicle transmission from the park mode until activated, the brake by wire system comprising, in combination:a brake intent signaling device; a brake apply mechanism; a controller programmed to activate the brake apply mechanism in response to the brake intent signaling device, the controller being further programmed to determine an operational state of the brake by wire system and to generate a transmission release signal in response to simultaneous presence of a brake intent signal and the determination of the operational state of the brake by wire system; and a supplemental control unit responsive to the transmission release signal to activate the brake solenoid transmission interlock unit and thus permit release of the transmission from the park mode to the drive mode.