| 摘要 |
PURPOSE:To prevent perfectly the gears of an auxiliary transmission from being damaged, by providing a clutch sensor for detecting the disengaged state of a clutch, and controlling the driving by the change of the gear ratio of the auxiliary transmission in accordance with the output from the sensor. CONSTITUTION:Electromagnetic valves 20, 22 are connected to an actuator 12 for driving by the change of the gear ratio of an auxiliary transmission, a control circuit for controlling the electromagnetic valves 20, 22 is provided with a clutch sensor 34, and the electromagnetic valves 20, 22 are controlled in accordance with the detected signals from the clutch sensor 34. Accordingly since the driving by the change of the gear ratio of the auxiliary transmission cannot be performed unless a clutch pedal is operated to engage the clutch completely, damage to the gears of the auxiliary transmission due to erroneous operation by the operator at the time when the gear ratio of the auxiliary transmission is changed can be obviated. |
