LAMBDA CALCULATION FROM EXHAUST GAS MEASUREMENTS Determining how close the A/F ratio is to the stoichometric point using exhaust gas analysis. Presented to East Bay ATA, Hayward, CA May 5, 2004 By: Robert J. Schrader President, Bridge Analyzers, Inc.
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Determining how close the A/F ratio is to the stoichometric point using exhaust gas analysis. Presented to East Bay ATA, Hayward, CA May 5, 2004 By: Robert.
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LAMBDA CALCULATION FROM EXHAUST GAS MEASUREMENTS
Determining how close the A/F ratio is to the stoichometric point
using exhaust gas analysis.
Presented to East Bay ATA, Hayward, CAMay 5, 2004
By: Robert J. Schrader President, Bridge Analyzers, Inc.
What is Lambda?
point. ricstoichometperfect the- balancein are
O2for Demand eCombustibl and O2 when 1.000 toequal is Lamdba
the vsProcess Combustion the toavailable O2 of ratio theis Lambda
)( OxygenfordemandesCombustibl
availableOxygenLambda
• Lambda is Oxygen
Balance
Why is Lambda Important?
Lambda control is necessary for peak combustion efficiency in the Engine.
Lambda control is necessary for peak CAT efficiency.
Lambda Control Improves Reliability, Fuel Economy and Lowers Emissions.
Combustion Efficiency (CE)
Engine out CE for Gasoline Fuel is no better than 95%.
Tailpipe-out CE for CAT equipped vehicles improves to 99.0-99.5%. Factor of 10 improvement Required for Current Emission Standards CAT CE is very Lambda-Dependent