Leakage detecting apparatus for an exhaust gas...

Details Leakage detecting apparatus for an exhaust gas... Leakage detecting apparatus for an exhaust gas...

2006-06-06

2006-06-06

Lefkowitz, Edward (Department: 2855)

Measuring and testing

With fluid pressure

Motor part or auxiliary

C073S117020, C073S117020, C073S116070

Reexamination Certificate

active

07055375

ABSTRACT:
A leakage detecting apparatus includes a re-circulating passage for re-circulating an exhaust gas from an exhaust system to an air intake system in the engine, a re-circulating valve disposed in the re-circulating passage to control a flow rate of the re-circulating exhaust gas, and an A/F ratio sensor for detecting an A/F ratio of the exhaust system. An electronic control unit detects an operation amount of the re-circulating valve and calculates correlation between the operation amount and output of the A/F ratio sensor to determine a leakage in the re-circulating passage. The correlation is obtained by an inner product calculation of a vector of deviations of a time-sequence vector of the operation amount relative to a moving average and a vector of deviations of a time-sequence vector of the output of the A/F ratio sensor relative to a moving average. Leakage in the re-circulating passage is detected when an accumulated value of the inner product values over a predetermined period exceeds a threshold value.

REFERENCES:
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