Method and system to control ignition timing of an internal comb

Details Method and system to control ignition timing of an internal comb Method and system to control ignition timing of an internal comb

1978-09-06

1981-01-13

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

F02P 504

Patent

active

042443393

ABSTRACT:
The composition of exhaust gases from an IC engine is dependent on ignition timing; to control the composition, therefore, ignition timing is adjusted in accordance with sensed exhaust gas composition signals. To prevent abrupt change of ignition timing, as the exhaust gas composition signal changes upon change of exhaust gases between reducing and oxidizing state, a limit stage is included which limits the change of ignition timing between succeeding ignition events to a predetermined incremental crankshaft angle, for example 2.degree.. The ignition angle adjustment may be nonsymmetrical in adding and subtracting direction, and, in any event, is limited to a maximum adjustment angle beyond which undesirable or unsafe operating conditions of the engine might obtain. In a preferred digital form, the count number of an accumulator counter, the output signal of which determines the occurrence of an ignition event, is modified, in said incremental steps, to thereby control the timing of the ignition event.

REFERENCES:
patent: 3903857 (1975-09-01), Honig et al.
patent: 3919987 (1975-11-01), Haubner et al.
patent: 3923021 (1975-12-01), Stark
patent: 3927304 (1975-12-01), Wentworth et al.
patent: 4063539 (1977-12-01), Gorille et al.
patent: 4122811 (1978-10-01), Bowler et al.
patent: 4133326 (1979-01-01), Cops et al.

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