Fuel injection control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10428757-B2
Application number	US-201815866859-A
Country	US
Kind code	B2
Filing date	Jan 10, 2018
Priority date	Jan 20, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A fuel injection control device for an internal combustion engine includes an electronic control unit configured to execute division processing for learning for dividing a requested injection amount into an injection amount of partial lift injection of an in-cylinder injection valve and a port injection amount of injection of a port injection valve, detect, on the basis of at least one of a terminal electric potential of a coil and a current flowing through the coil, an inflection point of a change in induced electromotive force of the coil in time attributable to a decline in a relative speed of a mover with respect to the coil, and correct the energization processing at a time when the partial lift injection is executed based on a timing of the detection of the inflection point.

First claim

What is claimed is:

1. A fuel injection control device for an internal combustion engine in which each of a plurality of cylinders is provided with an in-cylinder injection valve and a port injection valve, the in-cylinder injection valve being configured to be opened by an electromagnetic force acting on a mover including a magnetic body, the electromagnetic force resulting from energization processing for a coil, the in-cylinder injection valve being configured to inject a fuel into a combustion chamber and the port injection valve being configured to inject the fuel into an intake passage, the fuel injection control device comprising an electronic control unit configured to:
execute division processing for learning, the division processing for learning dividing a requested injection amount for controlling control amounts of the internal combustion engine into a partial lift injection amount and a port injection amount, the partial lift injection amount being an injection amount of partial lift injection during which the in-cylinder injection valve is opened such that the in-cylinder injection valve does not reach a maximum lift amount by the energization processing, the port injection amount being an injection amount of the injection of the port injection valve;
execute inflection point detection processing, the inflection point detection processing detecting, on the basis of at least one of a terminal electric potential of the coil and a current flowing through the coil, an inflection point of a change in induced electromotive force of the coil in time attributable to a decline in a relative speed of the mover with respect to the coil resulting from closing of the in-cylinder injection valve by termination of the partial lift injection based on the division processing for learning; and
execute correction processing, the correction processing correcting, on the basis of a timing of the detection of the inflection point the energization processing at a time when the partial lift injection is executed.

2. The fuel injection control device according to claim 1 , wherein the electronic control unit is configured to execute time division processing and multi-injection processing during at least one processing of cold start processing for the internal combustion engine and warm-up processing for a catalyst of the internal combustion engine, wherein:
the time division processing divides the requested injection amount into a full lift injection amount and the partial lift injection amount, the full lift injection amount being an injection amount of full lift injection during which the in-cylinder injection valve is opened while the in-cylinder injection valve reaches the maximum lift amount by the energization processing; and
the multi-injection processing executes the partial lift injection based on the time division processing after the full lift injection based on the time division processing is executed.

3. The fuel injection control device according to claim 2 , wherein the electronic control unit is configured to execute the division processing for learning on condition that a request for executing the at least one processing during which the time division processing and the multi-injection processing are executed is not made.

4. The fuel injection control device according to claim 1 , wherein the electronic control unit is configured to:
execute variable setting processing, the variable setting processing variably setting a target value of a pressure of the fuel supplied to the in-cylinder injection valve;
execute fuel pressure control processing, the fuel pressure control processing controlling the pressure of the fuel supplied to the in-cylinder injection valve to be the target value resulting from the variable setting processing by operating a high-pressure fuel pump discharging the fuel in a fuel tank storing the fuel injected by the in-cylinder injection valve to an in-cylinder injection valve side; and
execute injection amount variable processing, the injection amount variable processing allowing the injection amount of the partial lift injection resulted from the division processing for learning to be larger in a case where the pressure of the fuel supplied to the in-cylinder injection valve is high than in a case where the pressure of the fuel supplied to the in-cylinder injection valve is low.

5. The fuel injection control device according to claim 1 , wherein the electronic control unit is configured to:
execute injection sharing processing, the injection sharing processing dividing the requested injection amount, on the basis of an operation point of the internal combustion engine, into an injection amount of the injection by the in-cylinder injection valve and the port injection amount; and
execute the division processing for learning, by invalidating the division of the requested injection amount resulted from the injection sharing processing, at the operation point where the requested injection amount is entirely allocated to the port injection amount by the injection sharing processing.

Assignees

• Toyota Motor Co Ltd

Inventors

• Moriyama Yohei
• Satoh Shinji
• Kobayashi Daisuke
• Fujiwara Kohji

Classifications

• F02D41/2467

  for injectors · CPC title

• F02D41/266

  the computer being backed-up or assisted by another circuit, e.g. analogue · CPC title

• F02D41/34

  with means for controlling injection timing or duration · CPC title

• F02D2200/063

  Lift of the valve needle · CPC title

• F02D45/00

  Electrical control not provided for in groups F02D41/00 - F02D43/00 · CPC title