Throttle Actuator The throttle actuator is a linear-acting unit, using a 6 mm ball screw.
The actuator attaches between the brake system seat frame and the accelerator pedal.
Stall force is over 100 pounds (450N), and no-load speed is over 70 inches/sec (1778 mm/s).
In use, the actuator puts out over 40 pounds (178 N) pedal force at 50 inches/sec (1270 mm/s).
The throttle servo can be used alone with its own internal program, but it is more usually controlled by brake or steer programs. For example, the brake DAC sends a signal through the rear connector BTC (brake-throttle command) pin to the throttle A/D converter.
In ISO 9816 (power off reactions of vehicle in a turn) testing, the steer program holds initial conditions for three seconds, then sends a DT (drop throttle) command to the throttle servo. In the ISO braking in a turn test, the steer program drops throttle and controls braking simultaneously. In other tests, throttle or speed is held constant during the test.