Engine spark timing system with retard means and minimum burn ti

Details Engine spark timing system with retard means and minimum burn ti Engine spark timing system with retard means and minimum burn ti

1977-04-22

1978-08-15

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123148E, F02P 504

Patent

active

041064470

ABSTRACT:
In a spark timing system for a spark ignited internal combustion engine, means are provided for generating a series of alternating coil-on and coil-off signals in accordance with crankshaft rotation and one or more engine operating conditions, means are provided for normally passing each coil-on signal immediately to the spark coil to turn on current therethrough and means are provided for passing each coil-off signal to the spark coil to turn off current therethrough with a retard determined in accordance with an additional engine operating condition to generate a spark pulse retarded with respect to the normal spark timing. To ensure a minimum burn time for the spark plugs, means are provided to hold the spark coil in the off condition for a predetermined minimum burn time following each retarded coil-off signal, regardless of the possible appearance of a coil-on signal before the end of this minimum burn time.

REFERENCES:
patent: 3749974 (1973-07-01), Kissel
patent: 3871347 (1975-03-01), Weber
patent: 3875912 (1975-04-01), Bullo
patent: 4002155 (1977-01-01), Harned et al.
patent: 4033272 (1977-07-01), Henrich
patent: 4061116 (1977-12-01), Saida et al.
patent: 4063538 (1977-12-01), Powell et al.

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