| 摘要 |
PURPOSE:To prevent overshoot and undershoot by controlling the car-height speed so as to be high when the difference between a detected car-height and an amid car-height is larger than a prescribed value and low when the difference is smaller. CONSTITUTION:Each detected car-height signal of car-height sensors 40A-40C is input into a control circuit 60. Said control circuit 60 determines an aimed car-height and calculates the difference between the aimed car-height and a detected car-height by the aid of the operation signal of a manual switch 70 and according to a prescribed program, and compares said difference value with a set difference value. When the calculated difference value is larger than the set difference value, car-height adjustment is performed speedily by putting solenoids 23A-23C or solenoids 32A-32C into continuous electric conduction with a duty ratio of 100%. When the difference is smaller than the set value, the car-height adjusting speed is reduced by transmitting intermittent signals with a duty ratio T2/T1 into the solenoids 23A-23C and 32A-32C. Thus, overshoot and undershoot can be prevented. |
