G - Physics
01
N
73/95, 341/38.13
G01N 31/10 (2006.01) G01N 25/28 (2006.01) G01N 25/30 (2006.01)
Patent
CA 1133278
Abstract In a gas analysis method and apparatus especially suitable for controlling the inlet air to fuel ratio of a lean-running internal combustion engine, combustion effluent gas is divided into a plurality of part streams, there is added to a first part stream whichever of a combustible and a combustion-supporting constituent it is deficient in combustion is effected and the temperature difference between the streams is measured. Preferably the temper- ature difference is measured by reference to the magnitude of the electric current required to heat an untreated part stream to the temperature of a part stream heated by combustion due to the added constituent. Preferably the temperature sensor used acts as a catalyst for the combustion and as a heating element, so that com- buntion takes place only in the vicinity thereof. Gas flow through the apparatus is preferably effected by a constant vacuum engine intake.
320681
Ballantyne Donald G.
Imperial Chemical Industries Limited
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