| 摘要 |
PURPOSE:To prevent an overshoot and noise and improve follow-up characteristics, by setting two threshold values for the PID operation and adapting, when the result of the operation does not fall within the range between the two threshold values, one of the threshold value closer to the result to be changed into the PID operational value. CONSTITUTION:A threshold value setting means (g) for setting two threshold values for the PID operation is connected to an operaional value changing means (h) which is connected to the PID operational means (e) and defines either threshold value closer to the limit of range to PID operational value, if the result of operation stays outside the range limited by these threshold values. Thus , the slip controlling is executed with the threshold value which is closer to the PID- operated value when the slip error is too large and the PID-operated value exceeds that threshold value. Hence, it can be prevented that an overshoot becomes too large and the follow-up characteristics become poorer. Such things can also be prevented that the torque converter makes a vibration and the prime mover a makes a noise at a transient period of the slip controlling. |
