SYSTEM AND METHOD FOR JUDGING ABNORMAL CONDITION OF A COMBUSTION PRESSURE SENSOR

• US 20130116910A1
• Filed: 07/23/2012
• Published: 05/09/2013
• Est. Priority Date: 11/03/2011
• Status: Abandoned Application

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Nam, Kihoon, Han, Kyoungchan, Kim, Minsu
• Application Number:
  US13/555,975
• Publication Number:
  US 20130116910A1
• Time in Patent Office: Days
• US Class Current: 701/101
• CPC Class Codes: F02D 35/023 by determining the cylinder pressure
• CPC Class Codes: F02D 41/123 the fuel injection being cut-off
• CPC Class Codes: F02D 41/18 by measuring intake air flow
• CPC Class Codes: F02D 41/222 relating to the failure of sensors or parameter detection devices
• CPC Class Codes: F02P 19/028 the glow plug being combined with or used as a sensor
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A system and method for judging an abnormal condition of a combustion pressure sensor, may include determining whether a driving condition of a vehicle, a fuel injection condition, and an intake air condition may be satisfied, deriving a relational equation from an amount of air measured in real time and a combustion pressure measured by the combustion pressure sensor, and monitoring a slope and a y-intercept of the relational equation when the driving condition, the fuel injection condition, and the intake air condition may be satisfied, determining whether the slope and the y-intercept may be in a predetermined normal range, accumulating the number of times the slope and the y-intercept may be beyond the predetermined normal range, and outputting a warning when the accumulated number reaches a number which may be predetermined as an abnormal condition number of the sensor.

Claims

1. A method for judging an abnormal condition of a combustion pressure sensor, comprising:

determining whether a driving condition of a vehicle is satisfied;

determining whether a fuel injection condition is satisfied;

determining whether an intake air condition according to vehicle speed is satisfied;

deriving a relational equation from an amount of air measured in real time and a combustion pressure measured by the combustion pressure sensor, and monitoring a slope and a y-intercept of the relational equation when the driving condition, the fuel injection condition, and the intake air condition are satisfied; and

determining whether the slope and the y-intercept are in a predetermined normal range.

2. The method of claim 1, further including:

accumulating a number of times the slope and the y-intercept are beyond the predetermined normal range; and

outputting a warning when an accumulated number reaches a number which is predetermined as an abnormal condition number of the sensor.

3. The method of claim 1, wherein the driving condition is satisfied when the vehicle speed is faster than or equal to 100 kph.

4. The method of claim 1, wherein the fuel injection condition is satisfied when an amount of fuel injection is zero in a deceleration state of the vehicle.

5. The method of claim 1, wherein the slope and the y-intercept are derived by regression analysis using a least squares method (LSE).

6. A system for judging abnormal condition of a combustion pressure sensor, comprising:

the combustion pressure sensor for measuring combustion pressure of an engine;

a determination portion for determining whether a driving condition of a vehicle, a fuel injection condition, and an intake air condition are satisfied;

a control portion for deriving a relational equation from an amount of air measured in real time and the combustion pressure measured by the combustion pressure sensor, monitoring a slope and a y-intercept of the relational equation when the driving condition, the fuel injection condition, and the intake air condition are satisfied, and determining whether the slope and the y-intercept are in a predetermined normal range; and

a warning portion for accumulating a number of times the slope and the y-intercept are beyond the predetermined normal range and outputting a warning when an accumulated number reaches a number which is predetermined as an abnormal condition number of the combustion pressure sensor.

7. The system of claim 6, wherein the driving condition is satisfied when a vehicle speed is faster than or equal to 100 kph.

8. The system of claim 6, wherein the fuel injection condition is satisfied in a condition that an amount of fuel injection is zero in a deceleration state of the vehicle.

9. The system of claim 6, wherein the slope and the y-intercept are derived by regression analysis using a least squares method (LSE).