Application Of Stepping Motor In Automobile Test

Many automobile brake components are tested, such as the detection of the brake master cylinder booster assembly in the hydraulic brake system, and the detection of the air brake valve in the pneumatic brake system. In the test system, the motor is required to push the ball screw to Simulate the process of pressing the brake pedal to brake when the actual car is braking. The ball screw pushes the master cylinder or brake valve to achieve the various working conditions required by the car for braking to test various performances.

Since the stepper motor has a strictly proportional relationship between the angular displacement and the input pulse, there is no cumulative error during its movement, and the followability is good. Therefore, the stepper motor is selected as the actuator with better performance in the automotive brake component test system. The system hardware consists of displacement sensor, force sensor, stepper motor; the control core adopts industrial control computer and data acquisition card.

The stepping motor drives the ball screw through the coupling to form a force device. The force sensor is installed at the front end of the screw rod and is used to measure the magnitude of the stepping motor output torque "input force of the test piece". Send to the industrial computer for processing. The industrial computer controls the start, forward, backward and stop of the stepper motor, and controls the speed of forward and backward according to the test procedure. At the same time, the displacement sensor measures the displacement of the stepper motor Corresponding data is displayed on the display, and the qualification of the air brake valve is judged according to relevant industry standards.