Ignition timing control apparatus for a marine engine

Details Ignition timing control apparatus for a marine engine Ignition timing control apparatus for a marine engine

1990-12-13

1991-12-10

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123418, 123425, 123602, F02P 108, F02P 308, F02P 515

Patent

active

050708392

ABSTRACT:
An improved ignition control apparatus for a marine engine capable of improving the startability and the idling property at low speeds of the engine. An ignition coil is connected to a spark plug for a cylinder, and a generator coil supplies a current to the ignition coil. A switch element operates to switch on and off the conduction between the power supply means and the ignition coil so as to develop a high voltage on the ignition coil. An ignition timing controller controls the switch element so as to properly change the ignition timing of the cylinder depending upon the operating condition of the engine. The controller retards the ignition timing from a reference ignition timing suitable for engine starting to a first retard ignition timing suitable for normal and stable engine operation by a prescribed extent when the number of revolutions per minute of the engine exceeds a predetermined level. Further, if knocking takes place in the cylinder, the controller retards the ignition timing to a second retard ignition timing which retards from the first retard ignition timing by a prescribed extent so as suppress the knocking.

REFERENCES:
patent: 4204490 (1980-05-01), Ohki et al.
patent: 4572150 (1986-02-01), Foster
patent: 4594978 (1986-06-01), Kanno
patent: 4599982 (1986-07-01), Sugiura
patent: 4641618 (1987-02-01), Dogadko et al.
patent: 4938189 (1990-07-01), Morita et al.
patent: 4993371 (1991-02-01), McDougal et al.

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