Method and electronic apparatus for reversing the rotation of an engine
First Claim
1. 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.
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Accused Products
Abstract
A method and an electronic apparatus for reversing the rotation of a two-stroke internal combustion engine, provided with an ignition system powered by a permanent magnet voltage generator. The electronic apparatus comprises a microprocessor control unit programmed for controlling the sparking both during forward and backward rotations, and for controlling the reversal rotation procedure of the engine. The reversal procedure is controlled on the basis of information obtained from a first binary signal emitted by a bistable magnetic sensor activated by the magnetic flux of the generator, and from a second binary signal correlated to the polarities of output voltage of the voltage generator. The original forward or backward rotation is made to reverse by providing a sparking delay, and subsequently generating an advanced spark while the engine is still rotating in the original direction.
12 Citations
23 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Electronic apparatus for reversal of rotation of an internal combustion engine having at least one two-stroke cylinder-piston unit, comprising:
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an engine ignition circuit;
a voltage generator having a permanent magnet rotor and a stator provided with a winding for generating an alternate voltage for powering the ignition circuit;
means for supplying phase signals correlated to the direction and speed of rotation of the engine; and
un microprocessor control unit, for controlling the sparking phases of the ignition circuit and for effecting a reversal of rotation of the engine, the apparatus comprising;
a bistable sensor having first and second conductive states, said bistable sensor being cyclically activable during the rotation of the engine for the generation of a first binary signal correlated to said first and second conductive states;
a circuit for generating a second binary signal correlated to the polarities of the alternate voltage for the ignition circuit;
the microprocessor control unit comprising signal inlets fed with said first and second binary signals, said control unit being programmed for determining speed and direction of rotation of the engine, and for controlling the ignition of the engine during forward and reverse rotation, and for slowing down and reversing the rotation of the engine on the basis of information obtained from said first and second binary signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A rotation reversal kit for retrofitting an internal combustion engine having at least one two-stroke cylinder-piston unit, the kit comprising:
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an engine ignition circuit;
a voltage generator having a permanent magnet rotor and a stator provided with a winding for generating a voltage for feeding the ignition circuit;
means for supplying a phase signal correlated to the direction and speed of rotation of the engine;
a microprocessor-control unit for controlling the sparking phases of the ignition circuit and for effecting a reversal of rotation of the engine;
a bistable sensor cyclically activable during the rotation of the engine, to provide the generation of a first binary signal correlated to conductive states of the sensor;
a control circuit for generating a second binary signal correlated to the polarities of the feeding voltage for the ignition circuit;
and in which the microprocessor control unit is provided with said first and second binary signals and is programmed for detecting the speed and direction of rotation, as well as for controlling the sparking of the engine, during forward rotation and reverse rotation, and for slowing down and reversing the rotation of the engine on the basis of information obtained from said first and second binary signal provided by the bistable sensor and said control circuit.
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Specification