An electronic ignition system for a spark-ignition internal combustion engines which has a timing disk attached to the engine's shaft. The timing disk has peripherally located permanent magnets at desired locations which generates an output timing signal for each cylinder group. These output signal are picked up by sensor pickups which are connected to circuits for amplifying and shaping the timing signals. The coil driver switch charges the ignition coil and the spark plug is then fired. This ignition system is an improvement and a simpler ignition system then that which is usually utilized in reciprocal and rotary engines because it does not require the use of a computer or distributor and is particularly useful in the novel rotary-reciprocal engines.

An anti-rollback system for an automatic transmission includes an output gear connected to an output shaft of the automatic transmission, and a magnetic sensor for detecting output rpm of the output gear. The magnetic sensor is electrically connected to an. ECU (electronic control unit) and the output gear has a plurality of teeth, each tooth having a slot formed on its upper surface thereof.

A fuel injection equipment including a fuel injector for injecting fuel into a fuel injected space of an internal combustion engine and a fuel pump is disclosed. A generator which is driven by the internal combustion engine and has characteristics of being increased in output voltage or output current with an increase in engine rotation speed is used as any one of an injector driving power supply for feeding the fuel injector with an exciting current through an injector trigger circuit and a fuel pump driving power supply. Use of the generator as the power supply permits the fuel injection equipment to be controlled without requiring a complicated control circuit.

An ignition timing control device for a multi-cylinder internal combustion engine is disclosed, which determines the control timings of the ignition system on the basis of a rotational position signal, the leading and trailing edges of the pulses of which signal correspond to the first and second rotational positions of the crankshaft in relation to respective cylinders, wherein the second rotational position with respect to a specific cylinder is displaced by an offset angle. The pulses corresponding to the specific cylinder are identified by a cylinder identifying means on the basis of duty ratio t/T of the pulses. When the control timings such as the ignition timings are determined on the basis of the second rotational positions of the crankshaft, an offset compensator means compensates for the offset angle of the second rotational position with respect to the specific cylinder in the determination of the control timings, in response to an identification of a pulse corresponding to the specific cylinder by the cylinder identifying means.

In a cylinder identifying apparatus for an internal-combustion engine for identifying the state of a cylinder from rotation signal generating device of one system, reverse is detected on the basis of the occurrence period of a rotation signal when the engine is reversed, and erroneous control due to the reverse is avoided. In the cylinder identifying apparatus for an internal-combustion engine, there is provided reverse identifying device 7 for identifying reverse on the basis of the occurrence period of a rotation signal when the engine is reversed to avoid any erroneously-controlled state at the time of the engine reverse.