| 摘要 |
PURPOSE:To make it possible to operate an internal combustion engine safely, by deciding that something is wrong with a tappet valve, when counted number of a pulse signal, which is counted as regarding the rise point and the trail point of a tappet valve motion signal as triggers, becomes over the preset limit. CONSTITUTION:A tappet valve motion signal which corresponds to the motion of an exhaust valve 4, is input in a monitoring device 40 by a sensor 41, and a pulse signal which corresponds to the crank rotation angle, is also input in the monitoring device 40 by an encoder 16. Then,the pulse signal is counted as regarding the rise point and the trail point of the tappet valve motion signal as triggers, and a signal is output from the monitoring device 40 when said counted number becomes over the preset limit. By this signal, the second driving circuit 26 stops fuel feeding toward a cylinder 1, through operating a fuel shut- off valve 13, and at the same time, keeps the exhaust valve 4 to be opened, through quickly releasing the air in the air spring cylinder lower chamber of an air spring piston 47 which is moved in linkage the exhaust valve 4, and filling up the air spring cylinder upper chamber with air.
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