Ignition timing control device for a turbo-charged internal comb

Details Ignition timing control device for a turbo-charged internal comb Ignition timing control device for a turbo-charged internal comb

1979-03-30

1981-01-06

Lall, P. S.

Internal-combustion engines

Spark ignition timing control

Electronic control

123425, F02P 504

Patent

active

042429960

ABSTRACT:
An ignition timing control device for a turbo-charged internal combustion engine which retards or advances the ignition timing in accordance with the load condition on the engine. The control device acts on a timing adjustment mechanism attached to the distributor to control the ignition timing as a function of the intake manifold pressure. The control device has a housing and a yieldable wall, such as a diaphragm, in the housing forming a pressure chamber on one side thereof. A pressure line is connected to the pressure chamber and opens into the intake manifold at a point swept by the throttle. The manifold pressure, which at that point varies with changes in engine load, is transmitted through the line to the pressure chamber to act on the diaphragm. The diaphragm is coupled to the ignition timing adjustment mechanism so that the timing is advanced or retarded in response to the displacement of the diaphragm. The diaphragm is movable between a neutral position and a retarding position in response to increased pressure in the intake manifold and thereby the pressure chamber to retard the ignition timing, but only when the intake manifold pressure is above a predetermined minimum representing the onset of engine knocking. Preferably, the diaphragm is also movable towards an advancing position in response to negative manifold pressures, representing higher engine speeds and part-load or no-load conditions of the engine, to advance the ignition timing during those operating states.

REFERENCES:
patent: 2390166 (1945-12-01), Parkins et al.
patent: 3521609 (1970-07-01), Kashiwagi et al.
patent: 3543738 (1970-12-01), Barber et al.
patent: 3735743 (1973-05-01), Shimizu
patent: 3828743 (1974-08-01), Ludwig
patent: 3978831 (1976-09-01), Yoshikawa

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