US 2003/0070653 A1 · Fuel injection control system and method for internal combustion engine as well as engine control unit

Abstract

There is disclosed a fuel injection control system and method for an internal combustion engine as well as an engine control unit, which are capable of accurately determining a fuel injection period such fuel pressure and fuel deposition are reflected therein, thereby performing accurate and optimum control of the actual fuel injection amount. Operating conditions of the engine are detected. An amount of fuel demanded by the engine is determined according to the detected operating conditions of the engine. An amount of fuel deposited on walls downstream of the fuel injection valve, out of an amount of fuel injected from the fuel injection valve, is determined according to the detected operating conditions. A net amount of fuel to be injected from the fuel injection valve is determined based on the determined demanded amount of fuel and the determined deposited amount of fuel. Pressure of fuel to be injected from the fuel injection valve is determined. The fuel injection period is determined by correcting the determined net amount of fuel according to the determined pressure of fuel.

Claims12

Dependent claims

A fuel injection control system for an internal combustion engine, for controlling the amount of fuel to be injected from a fuel injection valve, by a fuel injection period during which the fuel injection valve is opened for fuel injection,

the fuel injection control system comprising:
operating condition-detecting means for detecting operating conditions of the engine;
demanded fuel amount-determining means for determining an amount of fuel demanded by the engine, according to the detected operating conditions of the engine;
deposited fuel amount-determining means for determining, out of an amount of fuel injected from the fuel injection valve, an amount of fuel deposited on walls downstream of the fuel injection valve, according to the detected operating conditions;
net fuel amount-determining means for determining a net amount of fuel to be injected from the fuel injection valve, based on the determined demanded amount of fuel and the determined deposited amount of fuel;
fuel pressure-determining means for determining pressure of fuel to be injected from the fuel injection valve;
and
fuel injection period-determining means for determining the fuel injection period by correcting the determined net amount of fuel according to the determined pressure of fuel.

5 more elements

A fuel injection control method for an internal combustion engine, for controlling the amount of fuel to be injected from a fuel injection valve, by a fuel injection period during which the fuel injection valve is opened for fuel injection,

the fuel injection control method comprising the steps of:
detecting operating conditions of the engine;
determining an amount of fuel demanded by the engine, according to the detected operating conditions of the engine;
determining, out of an amount of fuel injected from the fuel injection valve, an amount of fuel deposited on walls downstream of the fuel injection valve, according to the detected operating conditions;
determining a net amount of fuel to be injected from the fuel injection valve, based on the determined demanded amount of fuel and the determined deposited amount of fuel;
determining pressure of fuel to be injected from the fuel injection valve;
and
determining the fuel injection period by correcting the determined net amount of fuel according to the determined pressure of fuel.

5 more elements

An engine control unit including a control program for causing a computer to carry out fuel injection control for controlling an amount of fuel to be injected into an internal combustion engine from a fuel injection valve, by a fuel injection period during which the fuel injection valve is opened for fuel injection,

wherein the control program causes the computer to detect operating conditions of the engine, determine an amount of fuel demanded by the engine, according to the detected operating conditions of the engine, determine, out of an amount of fuel injected from the fuel injection valve, an amount of fuel deposited on walls downstream of the fuel injection valve, according to the detected operating conditions, determine a net amount of fuel to be injected from the fuel injection valve, based on the determined demanded amount of fuel and the determined deposited amount of fuel, determine pressure of fuel to be injected from the fuel injection valve, and determine the fuel injection period by correcting the determined net amount of fuel according to the determined pressure of fuel.

Dependencies are inferred from the claim text.

Fuel injection control system and method for internal combustion engine as well as engine control unit

Life of this patent

Fuel injection control system and method for internal combustion engine as well as engine control unit

Life of this patent

Abstract

Claims12