Fuel injection amount compensating method

Patent metadata

Field	Value
Publication number	US-9255543-B2
Application number	US-201314010198-A
Country	US
Kind code	B2
Filing date	Aug 26, 2013
Priority date	Dec 14, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

Disclosed is a fuel injection amount compensating method that may include measuring a real pressure of a combustion chamber, calculating a real pressure level of the combustion chamber based on the real pressure, calculating a real combustion noise index based on the real pressure level of the combustion chamber, calculating a target combustion noise index based on a driving condition, calculating a difference between the real combustion noise index and the target combustion noise index, and increasing or reducing a pilot injection amount of a fuel injector in accordance with the difference. Also disclosed is a fuel injection amount compensating system.

First claim

What is claimed is:

1. A fuel injection amount compensating method, comprising:
measuring a real pressure of a combustion chamber;
determining a real pressure level of the combustion chamber based on the real pressure;
determining a real combustion noise index based on the real pressure level of the combustion chamber;
determining a target combustion noise index based on a driving condition of a vehicle;
determining a difference between the real combustion noise index and the target combustion noise index; and
increasing or reducing a pilot injection amount of a fuel injector in accordance with the difference.

2. The fuel injection amount compensating method of claim 1 , wherein the real pressure of the combustion chamber is sensed by a pressure sensor.

3. The fuel injection amount compensating method of claim 1 , wherein the real pressure of the combustion chamber is a fast Fourier transform (FFT) signal processed to determine the real pressure level.

4. The fuel injection amount compensating method of claim 1 , wherein a specific frequency range is filtered at the real pressure level so that the real combustion noise index is determined.

5. The fuel injection amount compensating method of claim 1 , wherein the driving condition of the vehicle comprises at least one of a fuel injection pressure, a fuel injection amount, revolutions per minute (RPM) of an engine, a gear stage, an intake air temperature, a coolant temperature, an engine load, and a crank angle.

6. A fuel injection amount compensating system, comprising:
a fuel injector disposed to inject a fuel into a combustion chamber;
a pressure sensor disposed to measure a real pressure of the combustion chamber;
a signal processor configured to determine a real pressure level of the combustion chamber based on the real pressure, determine a real combustion noise index based on the real pressure level of the combustion chamber, determine a target combustion noise index based on a driving condition of a vehicle, and determine a difference between the real combustion noise index and the target combustion noise index; and
a controller configured to increase or reduce a pilot injection amount of the fuel injector in accordance with the difference.

7. The fuel injection amount compensating system of claim 6 , wherein the signal processor processes the real pressure of the combustion chamber by a fast Fourier transform (FFT) signal process to determine the real pressure level.

8. The fuel injection amount compensating system of claim 6 , wherein the signal processor filters a specific frequency range at the real pressure level to determine the real combustion noise index.

9. The fuel injection amount compensating system of claim 6 , wherein the driving condition of the vehicle comprises at least one of a fuel injection pressure, a fuel injection amount, revolutions per minute (RPM) of an engine, a gear stage, an intake air temperature, a coolant temperature, an engine load, and a crank angle.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Jung In Soo

Classifications

• F02D2200/025

  Engine noise, e.g. determined by using an acoustic sensor · CPC title

• F02D35/023

  by determining the cylinder pressure · CPC title

• F02D2041/288

  for performing a transformation into the frequency domain, e.g. Fourier transformation · CPC title

• F02D41/403 Primary

  with pilot injections · CPC title

• Y02T10/44

  Cross-Sectional Technologies · mapped topic