| 摘要 |
<p>PURPOSE:To prevent that a battery runs down as turning off of a switch is forgotten by detecting stoppage of rotation of an engine by means of detecting vibration of carbody, and thereby controlling run down of load. CONSTITUTION:Vibration of an engine is propagated to carbody while the engine is rotating, and induced voltage is generated at the both ends of a coil 6 from the fact that the magnet 23 of a vibration sensor 5 mounted at any position of carbody vibrates. This induced voltage is passed to a direct current cut condensor 7, and further amplified by a transistor 10 after an electric current bias is given by resistances 8, 9 and converted to direct current voltage by a smoothing circuit 15 and a driving circuit 16, and a switching element 3 is turned ON to energize a load 2. On the other hand, since induced voltage is not generated in the coil 6 of the vibration sensor 5 when the engine stopped, the output voltage of the driving circuit 16 becomes L level, and the switching element 3 is turned OFF to shut off the connection of electricity to the load 2.</p> |
