Control apparatus

Patent metadata

Field	Value
Publication number	US-10280864-B2
Application number	US-201615567736-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Apr 27, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A control apparatus, which controlling an operation of an injector provided to an internal combustion engine, includes: a voltage application unit applying a voltage raised to have a step-up target value to the injector to open the injector; a current measurement unit measuring a drive current supplied to the injector in response to an application of the voltage; and a calculator calculating a current difference value which indicates a difference between an actually-measured profile and a reference profile. The actually-measured profile indicates a time-variation in an actually-measured value of the drive current, and the reference profile is a profile set in advance. The step-up target value is corrected according to the current difference value that is calculated.

First claim

The invention claimed is:

1. A control apparatus controlling an operation of an injector provided to an internal combustion engine, the control apparatus comprising:
a voltage application unit applying a raised voltage that is a voltage raised to have a step-up target value to the injector to open the injector and applying a voltage lower than the raised voltage to the injector after applying the raised voltage;
a current measurement unit measuring a drive current supplied to the injector in response to an application of the voltage; and
a calculator calculating a current difference value which indicates a difference between a duration taken until the drive current exceeds the predetermined threshold from a time point when the raised voltage is started to be applied in an actually-measured profile and a duration taken until the drive current exceeds the predetermined threshold from a time point when the raised voltage is started to be applied in a reference profile, wherein the actually-measured profile indicates a time-variation in an actually-measured value of the drive current, and the reference profile is a profile set in advance,
wherein the step-up target value is corrected according to the current difference value that is calculated.

2. The control apparatus according to claim 1 , wherein:
a first threshold and a second threshold smaller than the first threshold are set in advance;
a correction of the step-up target value starts when an absolute value of the current difference value becomes equal to or larger than the first threshold value; and
the correction of the step-up target value continues until the absolute value of the current difference value becomes smaller than the second threshold value.

3. The control apparatus according to claim 1 , wherein:
an absolute value of a correction amount for the step-up target value is set to be increased as the absolute value of the current difference value increases.

4. The control apparatus according to claim 1 , wherein:
a sign of the current difference value calculated when a gradient of the drive current in the actually-measured profile is larger than a gradient of the drive current in the reference profile is set to be different from a sign of the current difference value calculated when the gradient of the drive current in the actually-measured profile is smaller than the gradient of the drive current on the reference profile.

Assignees

• Denso Corp

Inventors

• Yanoto Keisuke

Classifications

• H01F7/18

  Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings · CPC title

• F02D41/30 Primary

  Controlling fuel injection {(F02D41/182, F02D41/24 take precedence)} · CPC title

• F02D41/401

  Controlling injection timing (F02D41/402 takes precedence) · CPC title

• F02D2041/2003

  using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening · CPC title

• F01L9/04

  Mechanical Engineering · mapped topic