| 摘要 |
PURPOSE:To prevent an engine from being stopped by detecting the reduction of the engine speed at discharging granular material and opening the on-off valves of an exhaust tube. CONSTITUTION:On-off valves 22, 23 controlled by receiving a signal from a control circuit 21 are arranged downstream a connection part between an exhaust tube 6 and an introducing tube 7. The control circuit 21 signals when an engine speed detecting means 29 detects the engine speed less than a prescribed value that control valves 22, 23 should open. In such a way, the reduction of the engine speed is detected at discharging granular material, and thereby the on- off valves of the exhaust tube are opened, so that it is possible to prevent the engine from being stopped. |
