Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary
Patent
1986-02-07
1987-01-27
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Current or voltage sensing in coil primary
123427, 123418, 123415, 123406, F02P 508
Patent
active
046387854
ABSTRACT:
An ignition system for an internal combustion engine is disclosed. The ignition system includes a timing signal detector responsive to the rotation speed of an engine to generate a pulse signal including a leading edge and a trailing edge corresponding to the ignition timing and having a predetermined duty cycle, a triangular wave generator for generating a triangular wave voltage synchronized with the trailing edge of the pulse signal, a voltage storing circuit for storing the voltage level of the triangular wave voltage in synchronism with the leading edge of the pulse signal, a voltage divider for dividing the stored voltage in the voltage storing circuit to generate a reference voltage, a comparator for comparing the reference voltage and the triangular wave voltage to detect a difference therebetween, a charging and discharging controller for correcting the stored voltage in the voltage storing circuit so as to reduce to zero the difference at the leading edge of the pulse signal, a threshold voltage generator for generating a threshold voltage which is offset from the stored voltage by an amount corresponding to the desired dwell time of an ignition coil, and an energization controller for controlling the dwell time of the ignition coil in accordance with the result of a comparison between the threshold voltage and the triangular wave voltage.
REFERENCES:
patent: 4307691 (1981-12-01), Nagae et al.
patent: 4373488 (1983-02-01), Neubalfen
patent: 4380989 (1983-04-01), Takaki
patent: 4440130 (1984-04-01), Taguchi et al.
patent: 4467776 (1984-08-01), Mezger et al.
patent: 4473050 (1984-09-01), Kondo et al.
Makino Tomoatsu
Matsui Takeshi
Takeda Shunichi
Nelli Raymond A.
Nippondenso Co. Ltd.
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