| 摘要 |
PURPOSE:To ensure stable traveling by providing a failure detecting circuit for controlling time from control start to completion to detect abnormalities in a control system and forcibly controlling the sound control system to the normal position in the case of abnormalities. CONSTITUTION:When either of Hard H, Normal N and Soft S is selected by a change-over switch 1, abnormal current is regulated through a selection reference signal generating circuit 2, a comparation circuit 3 and a motor driving circuit 5 by a current limiting circuit 47 to drive a motor 4 of each liquid pressure buffier T, move the motor to the corresponding orifice position and feed back the angle according to the signal of a detecting circuit 6. And when the output of the comparation circuit 3 becomes L, a brake circuit is operatively stopped. A failure detecting circuit 50 time controls the outputs H and L of the circuits 2, 3 to detect abnormalities in a control system. When it judges that the control system has some abnormalities, a attenuating force change-over signal generating circuit 51 generates the output signal for forcibly setting the control system to N position and indicates the abnormalities. Thus, the attenuating force adjusting condition can be shifted to the safe side. |
