Control apparatus for a marine engine

Details Control apparatus for a marine engine Control apparatus for a marine engine

1992-04-20

1994-08-23

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123486, F02D 4102, F02P 515

Patent

active

053397843

ABSTRACT:
A control apparatus for a marine engine capable of effectively suppressing a great variation in the rotational speed of the engine due to a great variation in an intake air pressure particularly when the engine is trolling. In one form, an air/fuel ratio of a mixture supplied to the engine is made constant to maintain engine output power at a constant level. In another form, the intake air pressure, based on which the engine is controlled, is averaged in such a manner as to reduce a variation in the engine rotational speed by using a greater averaging coefficient during trolling than at other times. In a further form, if a variation in the intake air pressure is less than a predetermined value, the intake air pressure is used for controlling the engine, whereas if otherwise, another engine operating parameter such as an opening degree of a throttle valve is used instead of the intake air pressure.

REFERENCES:
patent: 4413602 (1983-11-01), Inoue et al.
patent: 4438294 (1984-11-01), Sawamoto
patent: 4726798 (1988-02-01), Davis
patent: 4955831 (1990-09-01), Inoue et al.

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