Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
2005-05-03
2005-05-03
McCall, Eric S. (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
Reexamination Certificate
active
06886396
ABSTRACT:
The present invention provides a method for easily measuring nitrogen oxide concentration of an engine vehicle emission. The method can measure vehicle emission from an engine of a vehicle in travel with high precision even in regions other than the lean region, that is, regions from the stoichiometrical region to the rich region by using a NOxsensor exclusively used for the lean region. The present invention has an arrangement in which a NOxsensor that is exclusively used for the lean region is installed in an exhaust pipe3connected to the engine2. Air (secondary air) A is introduced into the exhaust pipe3on the upstream side of the NOxsensor6so that the NOxsensor6is allowed to measure the concentration of NOxin the engine vehicle emission diluted by air A. Thus, the NOxconcentration in the engine vehicle emission before dilution G is obtained by using the measured value of the NOxconcentration after dilution and by using a dilution ratio.
REFERENCES:
patent: 5551411 (1996-09-01), Ward
patent: 6230487 (2001-05-01), Blumenstock et al.
patent: 6619107 (2003-09-01), Tsukamoto et al.
Kihara Nobutaka
Matsumoto Koichi
Tsukamoto Tokihiro
Horiba Ltd.
McCall Eric S.
Stevens Maurice
Swienton Brian F.
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