Abstract: To prevent reverse-direction operation of an internal combustion (IC) engine to which the ignition system is connected which, possibly, may lead to dangerous conditions if the IC engine is used, for example in a chain saw, lawn mower, or the like, a diode (35) is connected across a second, ignition instant modifying R/C circuit (34, 33) in the control network (29) of the magneto ignition system, which includes a first R/C circuit (30, 31) to provide for immediate conduction of a control transistor (27) and hence blocking of a controlled ignition transistor (21) and disconnection of the ignition system in case of reverse rotation. This system is a further development of the basic ignition system described in U.S. Pat. No. 4,188,929, to which reference is made.

Abstract: This invention relates to an automatic stopping device for stopping a diesel engine through cutting off the fuel supply to the latter upon detect of an accidental reversing of the diesel engine. The reversing of automobile diesel engines is rather easy to occur. In the event of an accidental reversing of the diesel engine, it is necessary to stop the engine immediately, for otherwise the engine may be damaged seriously. According to the invention, the reversing of the diesel engine is detected through the detection of change of phase relation between two phases of output voltage derived from a multi-phase alternator connected to the engine and for charging up the batteries, the change of phase relation occuring when the engine is accidentally reversed.