Catalyst monitoring using a hydrocarbon sensor

Details Catalyst monitoring using a hydrocarbon sensor Catalyst monitoring using a hydrocarbon sensor

G - Physics

01

N

G01N 27/16 (2006.01)

Patent

CA 2077152

Abstract of the Disclosure An on-board monitoring system for an automotive emission catalyst having (i) a test chamber remote from the automobile's engine exhaust gas stream; (ii) means for supplying the chamber with sampled exhaust gases sequestered from said stream; (iii) a single hydrocarbon sensor exposed to the exhaust gas in the chamber to render a signal responsive to the concentration of hydrocarbon in the chamber; and (iv) means for comparing the sensed signal with a reference signal, and, if a predetermined difference is exceeded, the catalyst is indicated as faulty. Means (ii) may have a supply channel interconnected between the chamber and the gas stream upstream of the catalytic converter, a supply channel independently interconnected between the chamber and the gas stream downstream of the catalytic converter, and valve means for permitting flow-through of no more than one channel to said chamber at any one moment, preferably cycled at a certain frequency. A method of on-board monitoring of an automotive vehicle catalyst, comprising: (a) periodically transferring a sample quantity of gas from the stream into a test chamber at a predetermined flow rate; (b) exposing a hydrocarbon sensor to the sequestered gas to generate a signal in proportion to the content of hydrocarbon in such gas; and (c) comparing the signal with a reference signal to determine if a predetermined difference exists and thereby conclude the catalyst is sufficiently degraded. 6007L

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