| 摘要 |
PROBLEM TO BE SOLVED: To prevent the abnormal combustion of an engine in a device having an opening and closing valve in the exhaust passage of an engine by allowing to set an inspection mode for tentatively opening and closing the opening and closing valve when a parking brake is in braked state a transmission is in neutral position, and the engine is in idling state. SOLUTION: When an inspection mode set switch 6 provided on a driver's seat is operated, an opening and closing valve 3 interposed in an exhaust passage 2 is closed when the operation of an exhaust brake is performed. At this time, it is confirmed that the exhaust brake is normally operated from the change engine rotation and sound. In a control circuit 5, it is allowed to set the inspection mode on the condition that a parking brake 21 is in braked state, a transmission 22 is in neutral position, and an engine 1 is in idling state, and when the inspection mode is established, the opening and closing valve 3 is tentatively opened and closed through an electromagnetic means 4 to prevent the generation of back fire or after fire.
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