Ignition timing control system

Details Ignition timing control system Ignition timing control system

1973-09-11

1976-02-03

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

1231465A, 123148DS, F02P 100

Patent

active

039358445

ABSTRACT:
A dilute air-fuel mixture operation as a method for purifying exhaust gas is effective for reducing simultaneously carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) contained in the engine exhaust. However, such operation reduces engine power remarkably. Though a reciprocating internal combustion engine having first and second spark plugs has been introduced to compensate this disadvantage, it has in turn brought about the problem that there is a tendency of increasing quantities of nitrogen oxides. While an increase of the interval between the firing of the two plugs may control an increase of nitrogen oxides, this results in a reduction of engine power. A most effective method of exhaust purification is to control an ignition system such that the interval between the firing of two plugs is made short only when high engine power is required, and the firing interval is made comparatively long in the normal operation of the engine.

REFERENCES:
patent: 3020897 (1962-02-01), Sekine et al.
patent: 3156228 (1964-11-01), Blackwood
patent: 3584608 (1971-06-01), Shibabaki
patent: 3626909 (1971-12-01), Hayashida
patent: 3626910 (1971-12-01), Porsche
patent: 3685295 (1972-08-01), Tatsutomi et al.
patent: 3704591 (1972-12-01), Tatsutomi
patent: 3716991 (1973-02-01), Tatsutomi et al.
patent: 3752128 (1973-08-01), Tatsutomi et al.
patent: 3794008 (1974-02-01), Mathews
patent: 3809042 (1974-05-01), Hosho et al.
Millman and Taub "Pulse, Digital and Switching Waveforms," Copyright 1965, McGraw Hill, pp. 422-431.

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