Control device for internal combustion engine

Patent metadata

Field	Value
Publication number	US-9903305-B2
Application number	US-201314409610-A
Country	US
Kind code	B2
Filing date	Jun 5, 2013
Priority date	Jun 21, 2012
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A control device for an internal combustion engine is provided which can stabilize behavior when a fuel injection valve is opened, and reduce a variation in the amount of fuel injection of the fuel injection valve. A control device ( 200 ) for an internal combustion engine includes high voltage difference detection means ( 404 ) for obtaining a difference between a predetermined reference voltage ( 403 ) and a real high voltage detected by a high voltage detection means ( 402 ), drive current difference storage means ( 406 ) for storing in advance the amount of device difference variation of a real drive current detected by drive current detection means ( 408 ), and drive control value correction means ( 409 ) for correcting at least one of a target value of a drive current to a fuel injection valve ( 105 ) and a target value of a drive time, on the basis of at least one result of the high voltage difference detection means and the drive current difference storage means, and corrects a target control value of the fuel injection valve on the basis of at least one detection result of the variation of the detected high voltage and the variation of the current for driving the fuel injection valve.

First claim

The invention claimed is:

1. A control device for an internal combustion engine, comprising:
a battery that applies a battery voltage to the internal combustion engine;
a fuel injection valve that injects a fuel directly into a combustion chamber;
high voltage generation means for boosting the battery voltage to a target high voltage to generate a desired high voltage;
high voltage detection means for detecting a real high voltage generated by the high voltage generation means;
fuel injection valve drive means for supplying any one of the real high voltage detected by the high voltage detection means and the battery voltage to the fuel injection valve at a desired timing to drive the fuel injection valve; and
drive current detection means for detecting a drive current of the fuel injection valve, wherein
the control device includes high voltage difference detection means for obtaining a difference between a predetermined reference voltage and the real high voltage detected by the high voltage detection means, drive current difference storage means for storing the amount of device difference variation of a real drive current detected by the drive current detection means in advance, and drive control value correction means for correcting at least one of a target value of the drive current to the fuel injection valve and a target value of a drive time, on the basis of at least one result of the high voltage difference detection means and the drive current difference storage means, and
when the real high voltage is higher than the predetermined reference voltage, the drive control value correction means is configured to correct at least one of: i) the target value of the drive current to the fuel injection valve, and ii) the target value of the drive time.

2. The control device for an internal combustion engine according to claim 1 , wherein the high voltage difference detection means detects a difference between a reference voltage and the real high voltage detected by the high voltage detection means with the target high voltage of the high voltage generation means as the reference voltage.

3. The control device for an internal combustion engine according to claim 1 , wherein
the control device further comprises a second fuel injection valve,
the high voltage difference detection means calculates the reference voltage on the basis of a voltage value of high voltage generated by the high voltage generation means at a first time when the supply of the high voltage to the fuel injection valve stops, an inclination of increase of voltage generated by the high voltage generation means when no high voltage is supplied to the fuel injection valve or to the second fuel injection valve, and a predetermined elapsed time between the first time and a second time when the supply of the high voltage to the second fuel injection valve starts, and
the high voltage difference detection means detects a difference between the calculated voltage as the reference voltage and the real high voltage detected by the high voltage detection means.

4. The control device for an internal combustion engine according to claim 1 , wherein the drive current difference storage means stores in advance a difference between a real drive current of the fuel injection valve drive means at the time of reaching at least one or more target drive currents when driving the fuel injection valve and the drive current detected by the drive current detection means.

5. The control device for an internal combustion engine according to claim 1 , wherein the control device decreases a target value of the drive current to the fuel injection valve, or shortens a target value of the drive time thereto if it is detected that the real high voltage is higher than the reference voltage, and increases the target value of the drive current to the fuel injection valve, or lengthens the target value of the drive time thereto if it is detected that the real high voltage is lower than the reference voltage, on the basis of the detection result of the high voltage difference detection means.

6. The control device for an internal combustion engine according to claim 1 , wherein the control device decreases a target value of the drive current to the fuel injection valve, or shortens a target value of the drive time thereto if it is detected that the drive current is larger than the target value of the drive current, and increases the target value of the drive current to the fuel injection valve, or lengthens the target value of the drive time thereto if it is detected that the drive current is smaller than the target value of the drive current, on the basis of the amount of device difference variation stored in the drive current difference storage means.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Mukaihara Osamu
• Toyohara Masahiro

Classifications

• F02M51/00

  Fuel-injection apparatus characterised by being operated electrically · CPC title

• F02D2041/2031

  Control of the current by means of delays or monostable multivibrators · CPC title

• F02D41/2467

  for injectors · CPC title

• F02D41/36 Primary

  with means for controlling distribution · CPC title

• F02D2041/2034

  Control of the current gradient · CPC title