Abstract: A rotational direction change-over control method capable of reversing a rotational direction of an internal combustion engine without discharging unburnt gas. When a reverse command is generated, feed of fuel to the engine is interrupted to reduce a rotational speed of the engine to a set level. An ignition position of the engine is advanced to an excessively advanced position during a reduction in rotational speed to the set level. When the rotational speed is reduced to the set level, feed of fuel is restarted to reverse a rotational speed of the engine. When judgment that the rotational speed is successfully reversed is made, the ignition position is transferred to a position near a top dead center, to thereby maintain rotation of the engine in a direction reversed.

Abstract: A reverse rotation control apparatus for a two-cycle engine of a motor vehicle which can be implemented inexpensively while preventing exhaust gas composition and ignition performance from degradation. The apparatus includes a variety of sensors for generating a variety of information signals corresponding to engine operating states, and an ignition control unit (10A) for generating an ignition signal (P) for the engine (1) on the basis of the variety of information. The sensors include at least a rotation sensor (6) for generating a rotation signal (SG) and a reverse rotation switch (23) for generating a reverse rotation command signal (RW).

Abstract: A reverse rotation control apparatus of inexpensive structure for making it possible to reverse rotation of a two-cycle engine for a motor vehicle without need for monitoring constantly engine rotation speed (rpm) while sparing gear box includes a variety of sensors for generating signals corresponding to engine operating states, and an ignition control unit (10A) for generating an ignition signal (P) on the basis of the various signals. The sensors include a rotation sensor (6) for generating a rotation signal (SG) indicating engine rotation number (Re) and a reverse rotation switch (23) for generating a reverse rotation command signal (RW).

Abstract: An electronic ignition system for an internal combustion engine is described herein. The ignition system includes a sensor assembly provided with two sensing elements configured and sized to detect teeth mounted on an outer cylindrical surface of the rotor of the voltage generator and to supply trigger signals to a controller. For each piston of the combustion engine, two teeth are provided onto the rotor. A first tooth is positioned to be detected before the piston reaches its top dead center when the rotor rotates in a forward direction and a second tooth is positioned to be detected before the piston reaches its top dead center when the rotor rotates in a reverse direction.

Abstract: A reverse rotation control system for a two-cycle engine of a motor vehicle which can be implemented inexpensively while preventing exhaust gas from degradation. The system includes a variety of sensors for generating signals corresponding to engine operation states, and an ignition control unit (10A) for generating an ignition signal (P) on the basis of the various signals. The sensors include a rotation sensor (6) for generating a rotation signal (SG) indicating engine rotation number (Re) and a reverse rotation switch (23) for generating a reverse rotation command signal (RW).

Abstract: A system for reversing the direction of a two-stroke, internal combustion engine provided with a spark ignition system, the engine having at least one cylinder and a piston reciprocating therein and connected to drive a rotary crankshaft, the system comprising: a manually operable inverse command button; trigger means located proximate a rotary member driven by the crankshaft, a cooperating member carried on the rotary member and cooperating with the trigger means as the rotary member rotates to generate a train of pulses; means detecting the direction of rotation of the crankshaft and generating a direction signal indicative of direction of rotation; a microprocessor control unit receiving the train of pulses, the direction signal and an output from the inverse command button and connected to control the spark ignition system, the microprocessor monitoring the speed and direction of rotation of the rotary member on the basis of the train of pulses and the direction signal, the microprocessor operable when th

Abstract: An electronic ignition system for reversible internal combustion engines. The ignition system comprises a voltage generator (10, 11) for feeding the ignition circuit (12, 13) of the engine (P), a first signal pickup device (PK1) in the voltage generator (10, 11) for providing a first timing signal and a second signal pickup device (PK2) angularly spaced part in advance for providing a second timing signal to a microprocessor (18) operable to detect the direction and the speed of rotation of the engine, and to generate control signals for sparking during forward or reverse running, depending on timing information provided to the microprocessor (18) by the first and second signal pickup devices (PK1, PK2). Reversal of rotation is started by providing the microprocessor (18) with a reverse control signal by a manually actuable switch device.

Abstract: To change a rotational direction of a working apparatus such as a nut runner, rotational positions of a crankshaft at the highest voltages of primary currents in normal and reverse rotating operations are symmetrically arranged in relation to a rotational position corresponding the top dead center of a piston, and the rotational positions of the highest voltages are set before the rotational position corresponding the top dead center of the piston. In rotating the engine either in the normal or the reverse direction, the voltage of a primary current of an electromotive coil 97 reaches the highest value at a predetermined rotational position before the top dead center of the piston 7. An ignition unit 177 detects that a predetermined voltage close to the highest voltage is attained or that a predetermined voltage drop from the highest voltage has occurred, to short-circuit the primary current and generate a high-voltage current in a secondary circuit.

Abstract: A reversing internal combustion engine has an ignition system controlled by a microprocessor which samples the magneto voltage output in order to make decisions concerning spark/timing. By suppressing the spark to allow the engine to slow down, and reapplying the spark at a suitable advance, reversal of the engine is effected from forward to reverse or reverse to forward.

Abstract: Apparatus for protecting reversible engines against damage during reversal of engine rotation notwithstanding that such reversal is initiated remotely by the operator by a single movement of the control handle without regard of the engine speed at the time such reversal is initiated, said apparatus including means for automatically cutting off engine throttle, determining the engine speed and direction of rotation at time reversal operation is initiated, and delaying, if necessary, restarting of the engine in the desired direction of rotation until rotation in the prior direction has been reduced to a safe speed for effecting such rotational reversal.