| 摘要 |
PURPOSE:To eliminate fluctuation of product and to reduce the size by constituting an ignition lead angle control circuit with digital circuit including means for detecting the minimum and maximum lead angle firing positions, oscillator, frequency divider, counter, firing signal generator, etc. CONSTITUTION:It is comprised of firing timing detector 1, FF 22, first and second frequency dividers 23, 24, oscillator 25, counter 26 and firing signal generator 27. The firing timing detector 1 is provided with maximum and minimum lead angle firing position detectors 4, 5 arranged near to a magnetic rotor 2 to receive the output signal from a magnetic pickup 3. In accordance to the output signal from each detector 4, 5, a rectangular signal produced from FF 22 is provided to each frequency divider 23, 24 to produce predetermined pulse train signal and on the basis of said output signal, a firing signal is produced from a firing signal generator 27 in accordance to the count from the counter 26. |
