Multiple slope ignition spark timing circuit

Details Multiple slope ignition spark timing circuit Multiple slope ignition spark timing circuit

1976-01-20

1978-08-08

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123148E, F02P 504

Patent

active

041049977

ABSTRACT:
A multiple slope ignition spark timing circuit for an internal combustion engine is disclosed which electronically provides a spark timing signal having a piecewise linear advance angle versus engine speed characteristic. A magnetic pick-up sensor produces an AC signal having a frequency proportional to the rotational engine speed. This AC signal is coupled to a programmable voltage slope generator which generates a variable slope voltage that is used to produce the phase difference (advance angle) between a spark timing signal and the AC input signal. An independent timer apparatus produces various timing pulses which result in changing the advance angle versus engine speed characteristic at various predetermined engine speeds. An engine vacuum sensor adjusts the slope produced by the voltage generator and thereby results in a fixed amount of vacuum advance angle being added to the spark timing advance angle versus speed characteristic. The spark timing signals produced by the multiple slope ignition spark timing circuit are then used to ignite the fuel mixture in the cylinders of the internal combustion engine when the pistons are at desired predetermined positions in accordance with the engine speed and vacuum pressure.

REFERENCES:
patent: 3277875 (1966-10-01), Miki
patent: 3738339 (1973-06-01), Huntzinger et al.
patent: 3749073 (1973-07-01), Asplund
patent: 3785356 (1974-01-01), Niemueller
patent: 3898894 (1971-08-01), Aono et al.
patent: 3910243 (1975-10-01), Gau et al.
patent: 3941103 (1976-03-01), Hartig
patent: 3955723 (1976-05-01), Richards
patent: 4016843 (1977-04-01), Dorrego
patent: 4020807 (1977-05-01), Del Zotto et al.

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