| 摘要 |
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 the inverse command button is pushed to 1) stop ignition thereby causing the engine to slow down, 2) when the engine speed falls below a predetermined level momentarily generate an ignition spark at an angle sufficiently in advance of top dead center to reverse the direction of rotation of the crankshaft, and 3) when the engine is reversed continue ignition at an appropriate timing for reverse rotation.
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