SYSTEM AND METHOD FOR JUDGING ABNORMAL CONDITION OF A COMBUSTION PRESSURE SENSOR
First Claim
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.
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Accused Products
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.
17 Citations
9 Claims
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1. A method for judging an abnormal condition of a combustion pressure sensor, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A system for judging abnormal condition of a combustion pressure sensor, comprising:
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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. - View Dependent Claims (7, 8, 9)
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Specification