US 6,959,242 B2 · Engine fuel injection control device

Abstract

A spark ignition engine (2) has a fuel injector (8) in an intake port (7). An engine rotation speed sensor (9) detects the rotation speed of the engine (2). The controller (1) determines the target fuel injection amount of the fuel injector (8) during startup of the engine (2) by correcting the basic injection amount in response to the trend in the variation in the engine rotation speed. When the rotation speed of the engine (2) decreases, the controller (1) sets the target fuel injection amount to be smaller than when the rotation speed of the engine (2) is increasing at an identical rotation speed. As a result, effects on the air-fuel ratio related to wall flow relative to fluctuations in the rotation speed of the engine (2) are eliminated and the control accuracy of the air-fuel ratio of the engine (2) is improved.

Claims17

Dependent claims

A fuel injection control device for a spark ignition engine having a fuel injector in an intake port, comprising:

an engine rotation speed sensor detecting an engine rotation speed;
and
a programmable controller programmed to:
calculate a basic injection amount of fuel;
calculate a target fuel injection amount by correcting the basic fuel amount in response to the trend in variation of the engine rotation speed such that a larger target fuel injection amount is given when the engine rotation speed increases than when the engine rotation speed decreases for an identical engine rotation speed;
and
control a fuel injection amount of the fuel injector to the target fuel injection amount.

4 more elements

Dependencies are inferred from the claim text.

Engine fuel injection control device

Life of this patent

Engine fuel injection control device

Life of this patent

Abstract

Claims17