US 5,690,074 AGranted

Fuel injection control system for internal combustion engines

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorKen Ogawa

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Abstract

A fuel injection control system for an internal combustion engine calculates an amount of fuel to be supplied to the engine, based on operating conditions of the engine including at least load on the engine. The system also calculates an amount of fuel adhering to the inner wall surface of the intake passage of the engine, and an amount of fuel to be carried-off from fuel adhering to the inner wall surface, by the use of adhering fuel parameters representative of transfer characteristics of fuel injected into the intake passage. The amount of fuel to be supplied to the engine is corrected according to the amount of fuel adhering to the inner wall surface of the intake passage and the amount of fuel to be carried-off from fuel adhering to the inner wall surface, to thereby calculate a corrected fuel injection amount. A time period elapsed after the engine is started is measured, and an after-start correction amount of the corrected fuel injection amount is calculated according to the time period elapsed after the engine is started. The corrected fuel injection amount is calculated based on the after-start correction amount of the corrected fuel injection amount until the time period elapsed after the engine is started reaches a predetermined time period.

Claims16

Dependent claims

In a fuel injection control system for an internal combustion engine having an intake passage having an inner wall surface, and at least one combustion chamber, said fuel injection control system including fuel supply amount-calculating means for calculating an amount of fuel to be supplied to said engine, based on operating conditions of said engine including at least load on said engine, adhering fuel amount-calculating means for calculating an amount of fuel adhering to said inner wall surface of said intake passage of said engine, by the use of adhering fuel parameters representative of transfer characteristics of fuel injected into said intake passage, carried-off fuel amount-calculating means for calculating an amount of fuel to be carried off from said fuel adhering to said inner wall surface of said intake passage into said at least one combustion chamber, by the use of said adhering fuel parameters, corrected fuel injection amount-calculating means for calculating a corrected fuel injection amount by correcting of said amount of fuel calculated by said fuel supply amount-calculating means according to said amount of fuel adhering to said inner wall surface of said intake passage and said amount of fuel to be carried-off from said fuel adhering to said inner wall surface, and fuel injection control means for injecting fuel in said corrected fuel injection amount into said intake passage;

the improvement comprising:
after-start time period-measuring means for measuring a time period elapsed after said engine is started;
and
after-start correction amount-calculating means for calculating an after-start correction amount of said corrected fuel injection amount according to said time period elapsed after said engine is started;
wherein said corrected fuel injection amount-calculating means calculates said corrected fuel injection amount based on said after-start correction amount of said corrected fuel injection amount until said time period elapsed after said engine is started reaches a predetermined time period.

2 more elements

In a fuel injection control system for an internal combustion engine having an intake passage and at least one combustion chamber, said intake passage having an inner wall surface, said fuel injection control system including fuel supply amount-calculating means for calculating an amount of fuel to be supplied to said engine, based on operating conditions of said engine including at least load on said engine, adhering fuel amount-calculating means for calculating an amount of fuel adhering to said inner wall surface of said intake passage of said engine, by the use of adhering fuel parameters representative of transfer characteristics of fuel injected into said intake passage, carried-off fuel amount-calculating means for calculating an amount of fuel to be carried off from said fuel adhering to said inner wall surface of said intake passage into said at least one combustion chamber, by the use of said adhering fuel parameters, corrected fuel injection amount-calculating means for calculating a corrected fuel injection amount by correcting said amount of fuel calculated by fuel supply amount-calculating means according to said amount of fuel adhering to said inner wall surface of said intake passage and said amount of fuel to be carried-off from said fuel adhering to said inner wall surface, and fuel injection control means for injecting fuel in said corrected fuel injection amount into said intake passage;

the improvement comprising:
count means for counting a number of times of explosion of said engine;
and
after-start correction amount-calculating means for calculating an after-start correction amount of said corrected fuel injection amount according to said number of times of explosion of said engine,
wherein said corrected fuel injection amount-calculating means calculates said corrected fuel injection amount based on said after-start correction amount of said corrected fuel injection amount until said number of times of explosion of said engine reaches a predetermined number.

2 more elements

Dependencies are inferred from the claim text.