| 摘要 |
An engine shut down apparatus of an internal combustion engine having a magneto type ignition system comprises a magneto generator, a power source circuit, an engine stop switch, a fuel cut drive circuit, a fuel cut-off solenoid valve, an engine stop circuit and a fuel cut-off/ignition stop circuit. When the engine stop switch is turned on, in the fuel cut-off/ignition stop circuit, an engine stop instruction signal is sent to the fuel cut-off drive circuit and then the fuel cut-off solenoid valve is operated so as to close the fuel supply to the engine. On the other hand, in the fuel cut-off/ignition stop circuit, the engine stop instruction signal is sent to the engine stop circuit after a specified time has elapsed so as to operate the engine stop circuit with a time lag. Then, the engine stop circuit short-circuits the ignition system so as to stop ignition. Further, the fuel cut-off/ignition stop circuit is electrically separated with respect to electric noises from the ignition system. Thus, the engine shut down apparatus enables the engine to stop smoothly and securely without causing running-on or after-burning under any operating condition.
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