| 摘要 |
PURPOSE:To heighten the braking force, by setting a second current command in addition to a reference current command and making higher the motor current at plugging against the slip-down in slope starting than that in the case with only the reference current command by using the sum of both the commands CONSTITUTION:In slope starting, the reference current command Vp is applied after the start of descent of vehicle and plugging is then performed. At that time, the current transmission factor gamma of chopper CH is set at about 5%. If the current transmission factor setpoint gammas of a current transmission factor comparator 7 is higher than the chopper current transmission factor in the state of pulgging, the comparator 7 generates an output and an AND gate generates an output signal at the plugging. Thereby, a switch 10 is turned on to apply the second current command Vp2. As a result, the motor current IA becomes higher than a level given by the reference current command Vp1 to heighten the braking force to prevent the vehicle from slipping down. |
