Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7164574 | Energy Conversion and Management | 2014 | 16 Pages |
Abstract
In this work, a zero-dimensional EGR model is described to estimate the transient (cycle-by-cycle) progression of EGR and the time (engine cycles) required for its stabilization. The model response is tuned to a multi-cylinder engine by using an overall engine system time-constant and shown to effectively track the transient EGR changes. The impact of EGR on the actual air-fuel ratio of the cylinder charge is quantified by defining an in-cylinder excess-air ratio that accounts for the oxygen in the recycled exhaust gas. Furthermore, a twin lambda sensor (TLS) technique is implemented for tracking the intake dilution and in-cylinder excess-air ratio in real-time. The modelling and analysis results are validated against a wide range of engine operations, including transient and steady-state low temperature combustion tests.
Keywords
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Physical Sciences and Engineering
Energy
Energy (General)
Authors
Usman Asad, Jimi Tjong, Ming Zheng,