Patent ID: 6830015
Filing Date: 2004-12-14
Classification: F02D,F02P,Y02T

Abstract:
Method for reversing the rotation of a two-stoke internal combustion engine having a voltage generator to generate an alternate voltage having different polarities for an ignition circuit, and an electronic control apparatus comprising a microprocessor unit for controlling the alternate voltage supplied to said ignition circuit, in which the reversal of rotation is performed after a reduction of the rotational speed of the engine, comprising the steps of:providing said control apparatus) with a bistable sensor having first and second conductive states, and cyclically switching the sensor between said first and second states during the rotation of the engine; generating a first binary signal having first and second operative levels correlated to said first and second conductive states of the bistable sensor; generating a second binary signal having first and second operative levels correlated to the polarities of the alternate voltage supplied to the ignition circuit; detecting speed and direction of rotation of the engine, on the basis of information obtained by the microprocessor control unit from said first and second binary signals; slowing down the speed of rotation of the engine while it is still rotating in the detected direction, by delaying the sparking of the ignition circuit with respect to a top dead centre of the engine; and effecting a reversal of rotation of the engine by sparking in advance, with respect to said top dead centre of the engine.