Ignition system for internal combustion engine

Internal-combustion engines – High tension ignition system – Having dwell control

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F02P 3045

Patent

active

048096687

ABSTRACT:
An ignition system for and internal combustion engine ignition coil energization time is controlled in accordance with operating conditions. First and second sections with respective constant angles in an ignition cycle are defined. An integrating circuit integrates in one direction in the second section of a preceding ignition cycle of the angle signal, and in the other direction in the first section of the next ignition cycle. When the integration value reaches a first predetermined value, an energization start signal is generated. An ignition coil begins to be energized at the time of generation of the energization start signal or at the shift of the angle signal from the first section to the second section, whichever arrives earlier, and the energization is stopped when the angle signal shifts from the second to first section. The engine speed is detected to change the rate of integration of the integrating circuit thereby to change the first predetermined value for generating the energization start signal. When the integration value in the second section reaches a second predetermined value cooresponding to the low-speed engine operation, the energization start signal is invalidated thereby to fix the coil energization time in the second section.

REFERENCES:
patent: 3937193 (1976-03-01), Kim
patent: 4228779 (1980-10-01), Wetzel
patent: 4275701 (1981-06-01), Arguello et al.
patent: 4429235 (1984-01-01), Minner

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