| 摘要 |
PURPOSE:To increase the durability of a valve stopping device by controlling some valves as to stop when the signal which registers either presence of absence of power transmission between engine output shaft and engine load shows that the power transmission is interrupted. CONSTITUTION:Output signal of revolutions number sensor 40 is converted into voltage VN by f-V converter 41, and it is compared with given voltage value V1 which is correspondent to determined number of engine revolutions, by comparator 42. When VN>=V1, H-signal is input to AND-circuit 43. When the change gear of this AND-circuit 43 is not in neutral position and neutral switch 48 is ''off'', H-signal is output through level modification circuit 49. When the clutch is connected and clutch switch 50 is ''on'', H-signal is output through level modification circuit 51. After that, switch circuit 52 is closed, solenoid 33 of stopping device is activated, and all valves are operated. On the other hand, when L-signal is output from AND-circuit 43, solenoid 33 is de-energized and some valves are stopped. |
