Nitric oxide enhanced response circuit for gas analyzer

Details Nitric oxide enhanced response circuit for gas analyzer Nitric oxide enhanced response circuit for gas analyzer

G - Physics

01

D

G01D 3/02 (2006.01) G01D 3/028 (2006.01) G01M 15/00 (2006.01) G01N 27/407 (2006.01)

Patent

CA 2247745

An exhaust emissions analyzer for an automotive internal combustion engine has sensors for detecting constituents of the exhaust emissions, including a nitric oxide cell which receives the emissions and outputs an electrical signal indicative of nitric oxide in the emissions. An R-C circuit is interposed between the output of the nitric oxide cell and processing circuitry for enhancing the response time of the nitric oxide cell, reducing the rise and fall times of the cell output of signal. A temperature-responsive switching circuit disconnects the R-C enhancement circuit above a predetermined ambient temperature.

Un analyseur de gaz d'échappement pour un moteur automobile à combustion interne comprend des capteurs servant à déterminer les composants des gaz d'échappement, y compris une cellule de monoxyde d'azote qui reçoit les gaz et produit un signal électrique indicateur du monoxyde d'azote contenu dans les gaz d'échappement. Un circuit R-C est placé entre la sortie de la cellule de monoxyde d'azote et la circuiterie de traitement afin d'améliorer le temps de réponse de la cellule de monoxyde d'azote, de réduire le temps de descente et de remontée de la sortie de signal de la cellule. Un circuit de commutation sensible à la température disconnecte le circuit d'amélioration R-C lorsque la température ambiante dépasse un niveau prédéterminé.

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