Dual circuit pneumatic foot valve with electronically controlled proportional modulator (ECPM) and operator input sensing

A foot control valve assembly for operating a vehicle brake system having an associated brake pedal and at least one braking circuit associated with one or more wheels of the vehicle, the valve assembly comprising:

• a brake valve for selectively applying braking pressure to the at least one braking circuit of the vehicle, the brake valve being proportionally actuatable by a vehicle operator via a plunger operatively connectable to the associated brake pedal;
• a brake valve actuator for selectively actuating the brake valve to effect an autonomous braking function, the brake valve actuator responsive to a pneumatic control signal;
• an electronically controlled proportional modulator responsive to an electronic control signal received from an associated controller, the electronically controlled proportional modulator configured to modulate the pneumatic control signal provided to the brake valve actuator to control actuation of the at least one brake valve during an autonomous braking event;
• and
• at least one sensor for sensing driver braking demand, the sensor configured to communicate sensed driver braking demand to the associated controller.