Method and apparatus for changing the spark advance of internal

Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means

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1231465A, 123117D, H03K 300

Patent

active

039411036

ABSTRACT:
The invention concerns a method and apparatus for controlling the angle of advance of an internal combustion engine, in proportion to at least one parameter e.g. intake manifold vacuum, of the internal combustion engine. The main shaft of the engine has an impulse generating wheel and pickup which generates a fixed number of pulses (main pulses) during a particular revolution, the pulses representing a crank movement angle .psi. greater than any spark advance angle required. A fixed advance time t is converted into impulses the number of which varies with engine speed, and is thereafter increased or decreased also in proportion to said engine parameter. This final number is substracted from the main pulses, and the remaining pulses (trigger pulses) counted out during the next revolution from the commencement .psi. 0 of the angle .psi.. At the end of this count a firing pulse is emitted to cause a spark.

REFERENCES:
patent: 3696303 (1972-10-01), Hartig
patent: 3738339 (1973-06-01), Huntzinger et al.
patent: 3749073 (1973-07-01), Asplund
patent: 3757755 (1973-09-01), Carner

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