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The Effect of EGR System Response Time on NOx Feedgas Emissions during Engine Transients
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Abstract
Quantitative measurements were made of NOx feedgas emissions during transient engine operation as the response time of an EGR system was progressively-degraded. For a simple acceleration-cruise-deceleration engine speed/torque versus time trajectory, it was found that the NOx emissions were higher during acceleration and lower during deceleration than corresponding values predicted from steady-state mapping data. The magnitude of the differences, as well as the total mass of NOx integrated over the speed/torque trajectory, all increased as the EGR response time was increased. Using a simple dynamic EGR model, NOx feedgas emissions were predicted for engine operation with a production EGR system over a 128 second portion of the FTP CVS cycle. The NOx feedgas predictions were shown to be in excellent agreement with actual emission measurements.
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Throop, M., Cook, J., and Hamburg, D., "The Effect of EGR System Response Time on NOx Feedgas Emissions during Engine Transients," SAE Technical Paper 850133, 1985, https://doi.org/10.4271/850133.Also In
References
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