Electronically controlled fuel injection type two-stroke engine

Details Electronically controlled fuel injection type two-stroke engine Electronically controlled fuel injection type two-stroke engine

1999-03-16

2000-07-04

Solis, Erick

Internal-combustion engines

Charge forming device

Fuel injection system

123486, 701104, F02M 5100

Patent

active

060823348

ABSTRACT:
The present invention is to provide an electronically controlled fuel injection type two-stroke engine wherein the intake air amount can be determined with precision so that the fuel injection amount can be properly controlled in conformity with the varying conditions of the exhaust pressure, to thereby achieve an optimal air-fuel ratio and hence improve the output power, the fuel consumption and the exhaust performance.
For the computation of the correction value to the fuel injection amount based on the intake passage pressure, the actual throttle opening and engine speed are detected, and the intake pressure value P is detected at the same time. Then the corresponding basic intake pressure value is selected from the basic intake pressure map so as to calculate the difference between the basic intake pressure value and the detected intake pressure value. This difference corresponds to the difference in exhaust pressure between the base state and the actual run state (exhaust pressure varies depending upon the conditions such as the boat speed, forward/backward mode, the mounted position (height) and the number of the mounted engines and the like). From this difference, the correction value to the fuel injection amount based on the intake pressure is computed.

REFERENCES:
patent: 4899713 (1990-02-01), Nakamura
patent: 5190008 (1993-03-01), Yamasaki et al.
patent: 5341786 (1994-08-01), Abe et al.
patent: 5349933 (1994-09-01), Hasegawa et al.
patent: 5749376 (1998-05-01), Halvorson et al.

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