초록 ▼

The crankshaft bears a mark which passes in front of a sensor. When the crankshaft is rotated as the engine turns, the sensor delivers a squarewave signal when this mark passes in front of it. The mark and the sensor are positioned with respect to each other such that when the end of the mark passes

The crankshaft bears a mark which passes in front of a sensor. When the crankshaft is rotated as the engine turns, the sensor delivers a squarewave signal when this mark passes in front of it. The mark and the sensor are positioned with respect to each other such that when the end of the mark passes in front of the sensor the piston is in a given low position and moves up toward the spark plug and such that when the other end of the mark passes in front of the sensor, the piston has substantially reached its maximum stroke within the cylinder in the vicinity of the spark plug, i.e. when it produces the maximum compression of the combustion gases located in the cylinder. The output of the sensor is connected to the input of a reset circuit of a counter and to the input of a count start and stop circuit of this counter and also to the input of a transfer control circuit. The count input of the counter is connected to the output of a pulse generator, such as a clock, for example, delivering pulses at a given constant frequency. The output of the counter is connected to the input of a buffer memory whose control input is connected to the output of the transfer control circuit. The output of the buffer memory is connected to the input of a permanent memory whose function will be explained further below. The output of the permanent memory is connected to a first input of a binary comparator whose other input is connected to the output of the counter. The output of the binary comparator is connected to the input of the ignition system, i.e. the spark plug. This connection, shown in a dotted line, can be achieved, for example, by an amplifier or any other electronic system making it possible, from an electric pulse delivered by a binary comparator, to produce between the electrodes of the spark plug a spark with a sufficient energy to produce the combustion of the combustion gases contained in the cylinder.

대표청구항 ▼

An electronic circuit for controlling the ignition means of an internal combustion engine having at least one piston and marker means indicative of a first and a second position of said piston, comprising: sensor means responsive to said marker means for producing a first and second signal correspon

An electronic circuit for controlling the ignition means of an internal combustion engine having at least one piston and marker means indicative of a first and a second position of said piston, comprising: sensor means responsive to said marker means for producing a first and second signal corresponding respectively to the first and the second position; means responsive to said first and second signal for generating a number N proportional to the time interval separating said first signal from said second signal; inverting means for producing a number lllll