| 摘要 |
A drive (17) is provided at the throttle valve (16) for adjusting this. A control unit (26) in the undisturbed operation of the engine activates an opening of the valve giving the full air flow cross section, and with disturbed operation activates a closing of the valve to give a reduced air flow cross section. The sucked in combustion air is throttled so much, that on one hand the engine runs more reliably at idling r.p.m. and on the other hand, with the supply of a certain amt. of fuel in the combustion cylinder (10) a specified r.p.m. is not exceeded. A monitoring unit (26) is provided for operational control of throttle drive. The throttle is effective in idling mode and after each start is only once effectively connected. A sensor (27) is provided for detecting at least the closed position of the throttle valve (16). Its output signal is fed to the monitoring unit (26), which gives a warning signal if this does not represent the closed position of the valve (16). The sensor (27) can be designed as a lambda probe, an exhaust temp. sensor or as an electric switch.
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