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Engine-Out and Tail-Pipe Emission Reduction Technologies of V-6 LEVs
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Abstract
Compared with in-line 4-cylinder engines, V-6 engines show a slower rise in exhaust gas temperature, requiring a longer time for catalysts to become active, and they also emit higher levels of engine-out emissions. In this study, The combination of a new type of catalyst, and optimized ignition timing and air-fuel ratio control achieved quicker catalyst light-off. Additionally, engine-out emissions were substantially reduced by using a swirl control valve to strengthen in-cylinder gas flow, adopting electronically controlled exhaust gas recirculation (EGR), and reducing the crevice volume by decreasing the top land height of the pistons. A vehicle incorporating these emission reduction technologies reduced the emission level through the first phase of the Federal Test Procedure (FTP) by 60-70% compared with the Tier 1 vehicle. The application of these technologies should enable V-6 engines to comply with Low Emission Vehicle (LEV) standards without adding expensive devices such as a secondary air pump or an electrically heated catalyst.
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Takahashi, H., Ishizuka, Y., Tomita, M., and Nishizawa, K., "Engine-Out and Tail-Pipe Emission Reduction Technologies of V-6 LEVs," SAE Technical Paper 980674, 1998, https://doi.org/10.4271/980674.Also In
References
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