Fuel injection control system for internal combustion engine

Details Fuel injection control system for internal combustion engine Fuel injection control system for internal combustion engine

1998-07-01

2000-05-09

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means having fuel injection only

Combustible mixture stratification means

123299, 123305, F02B 1700

Patent

active

060589051

ABSTRACT:
A fuel injection control system for a cylinder direct injection spark-ignition internal combustion engine judges a homogeneous charge combustion condition which requires homogeneous charge combustion and a stratified charge combustion condition which requires stratified charge combustion, in accordance with an engine operating condition. Fuel is supplied on an intake stroke so as to form a rich equivalent ratio in the homogeneous charge combustion, and fuel is supplied on a compression stroke so as to form a lean equivalent ratio in the stratified charge combustion, with the rich equivalent ratio being richer in fuel than the lean equivalent ratio. The system then gradually changes over an equivalent ratio within a range between the rich and lean equivalent ratios when engine operation is changed over between the homogeneous charge combustion condition and the stratified charge combustion condition. The system then injects first and second quantities of fuel into a cylinder of the engine respectively on intake and compression strokes in each cycle of the cylinder at least at a predetermined time during a time period in which the equivalent ratio is gradually changed over.

REFERENCES:
patent: 4955339 (1990-09-01), Sasaki et al.
patent: 5127378 (1992-07-01), Ito
patent: 5313920 (1994-05-01), Matsushita

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