US 5,341,786 A · Fuel injection control device for internal combustion engine

Abstract

A fuel injection control device controls the calculated fuel injection quantity depending upon the load condition of the engine such that the fuel injection quantity demanded by the engine can be established. This fuel injection quantity is determined based upon engine speed, intake air temperature, engine temperature, the atmospheric pressure of the intake air, and the throttle opening. When the detected intake air temperature is high for a high load condition of the engine, an intake air temperature correction factor is set such that the intake air temperature is less influential upon the establishment of the fuel injection quantity. Moreover, during acceleration, an acceleration incremental fuel injection quantity is calculated based upon different water temperature correction factors. When an engine temperature is low, the fuel injection quantity demanded by the engine is very large. Accordingly, the fuel injection control device utilizes a second water temperature correction factor which is set to be larger than a first water temperature correction factor at low engine temperatures. Thus, the fuel injection quantity for acceleration of the engine at low engine temperatures can be established in accordance with the demand by the engine.

Claims18

Dependent claims

A fuel injection control device for an internal combustion engine, comprising:

fundamental fuel injection quantity setting means for establishing a fundamental fuel injection quantity as a fuel injection quantity during normal operation of the engine;
fundamental fuel injection quantity correction factor setting means for establishing a fundamental fuel injection quantity correction factor;
fundamental fuel injection quantity correcting means for correcting said fundamental fuel injection quantity by said fundamental fuel injection quantity correction factor;
acceleration incremental fuel injection quantity setting means for establishing an acceleration incremental fuel injection quantity as an increment of said fuel injection quantity during acceleration of the engine;
acceleration incremental fuel injection quantity correction factor setting means for establishing an acceleration incremental fuel injection quantity correction factor;
acceleration incremental fuel injection quantity correcting means for correcting said acceleration incremental fuel injection quantity;
first water temperature correction factor setting means for establishing a first water temperature correction factor according to an engine temperature;
second water temperature correction factor setting means for establishing a second water temperature correction factor according to the temperature of the engine;
and
throttle detecting means for detecting an angle of a throttle of the engine;
said fundamental fuel injection quantity correction factor setting means establishing said fundamental fuel injection quantity correction factor according to said first water temperature correction factor;
said acceleration incremental fuel injection quantity correction factor setting means establishing said acceleration incremental fuel injection correction factor according to said second water temperature correction factor;
said fundamental fuel injection correcting means using said acceleration incremental fuel injection quantity correction factor when said throttle detecting means detects that the angle of the throttle is greater than a predetermined value.

10 more elements

A fuel injection control device for an internal combustion engine, comprising:

a fundamental fuel injection quantity circuit to establish a fundamental fuel injection quantity as a fuel injection quantity during normal operation of the engine;
a fundamental fuel injection quantity correction factor circuit to establish a fundamental fuel injection quantity correction factor;
a fundamental fuel injection quantity correcting circuit to correct said fundamental fuel injection quantity by said fundamental fuel injection quantity correction factor;
an acceleration incremental fuel injection quantity circuit to establish an acceleration incremental fuel injection quantity as an increment of said fuel injection quantity during acceleration of the engine;
an acceleration incremental fuel injection quantity correction factor circuit to establish an acceleration incremental fuel injection quantity correction factor;
an acceleration incremental fuel injection quantity correcting circuit to correct said acceleration incremental fuel injection quantity;
a first water temperature correction factor circuit to establish a first water temperature correction factor according to an engine temperature;
p1 a second water temperature correction factor circuit to establish a second water temperature correction factor according to the temperature of the engine;
and
a throttle detecting circuit to detect an angle of a throttle of the engine;
said fundamental fuel injection quantity correction factor circuit establishing said fundamental fuel injection quantity correction factor according to said first water temperature correction factor;
said acceleration incremental fuel injection quantity correction factor circuit establishing said acceleration incremental fuel injection correction factor according to said second water temperature correction factor;
and
said fundamental fuel injection quantity correcting circuit using said acceleration incremental fuel injection quantity correction factor when said throttle detecting circuit detects that the angle of the throttle is greater than a predetermined value.

11 more elements

Dependencies are inferred from the claim text.

Fuel injection control device for internal combustion engine

Life of this patent

Fuel injection control device for internal combustion engine

Life of this patent

Abstract

Claims18