Open loop computer-controlled spark ignition timing system

Details Open loop computer-controlled spark ignition timing system Open loop computer-controlled spark ignition timing system

1979-09-12

1981-06-16

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Fuel injection system

123416, F02P 504

Patent

active

042730899

ABSTRACT:
An electronic system for controlling the firing time of a spark ignition, internal combustion engine counts teeth or other code indicia as an angle-related, closed-loop, coarse indication of firing angle and follows the coarse indicating count with a fine, variable open-ended time delay in response to clock signals currently related to engine angle, to provide firing angles which fall within a tooth (or other indicium). In one embodiment, a pre-dwell period of fixed angular extent, determined by a fixed tooth count, is followed by a variable dwell period including a variable tooth count portion, a fixed speed measurement and calculation time portion, and a variable, final clock time-out portion. In the disclosed embodiment, the system is controlled and calculations are performed by a microprocessor, whereas tooth counting, tooth-to-tooth clock calibration and clock counting are performed by a hardware counter which is controlled by hardware logic circuitry.

REFERENCES:
patent: 3941103 (1976-03-01), Hartig
patent: 3946709 (1976-03-01), Monpetit
patent: 4175507 (1979-11-01), Kawai

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