Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1997-01-22
1999-05-04
Argenbright, Tony M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, F01N 320
Patent
active
058990623
ABSTRACT:
A method and system for monitoring the efficiency of a catalytic converter include determining a ratio of signal arc lengths from an upstream exhaust gas sensor and a downstream exhaust gas sensor which generate signals indicative of oxygen content in the exhaust upstream and downstream, respectively, relative to the converter. A controller processes the signals to determine the ratio of the arc length of the rear or downstream sensor signal to the arc length of the front or upstream sensor signal over a test period. The arc length is calculated by summing over the test period a series of incremental arc lengths for each incremental time interval in the test period. An incremental signal length may be calculated using the square root of the sum of the square of the change in value of a signal during an incremental time interval and the square of the duration of the incremental time interval. The ratio is indicative of the efficiency of the converter which may be compared with subsequently generated ratios to monitor converter efficiency over time.
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Davey Christopher Kirk
Jerger Robert Joseph
Kluzner Michael I.
Nader David R.
Argenbright Tony M.
Ford Global Technologies Inc.
Lippa Allan J.
May Roger L.
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