742 Scenario

The chopper is operating in the acceleration CCM, yet the vehicle is moving backward on a steep uphill road. If the duty ratio has not yet reached 100%, d1 can be increased all the way up to 1 by depressing the acceleration pedal further and increasing the torque output ofthe motor. Increasing d 1 will raise the motor speed-torque characteristics vertically upwards, enabling a possible steady state operating point in the first quadrant. If the motor rating has reached its limit, then the torque cannot be increased further to overcome the road load resistance. The slope is too steep for the rating of the motor, and the vehicle rolls backward. The wheel back-drives the motor in this case.

0 0

Post a comment