Brake by wire system with BTSI based vehicle operation control

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 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;
• first and second brake apply mechanisms;
• a first controller programmed to activate the first brake apply mechanism in response to a first braking intent signal from the brake intent signaling device, the first controller being further programmed to determine a first operational state of the brake by wire system, the first controller being further programmed to generate a first transmission release signal in response to simultaneous presence of the first braking intent signal and a determination of the first operational state of the brake by wire system:
• a second controller programmed to activate the second brake apply mechanism in response to a second braking intent signal from the brake intent signaling device, the second controller being further programmed to determine a second operational state of the brake by wire system, the second controller being further programmed to generate a second transmission release signal in response to simultaneous presence of the second braking intent signal and a determination of the second operational state of the brake by wire system;
• and
• a supplemental control unit responsive to at least one of the first transmission release signal and the second 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.