Gasoline particulate reduction using optimized port and direct injection
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United States of America Patent
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Sep 13, 2016
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app pub date -
Aug 31, 2015
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Dec 7, 2012
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Abstract
Additional approaches for the reduction of particulate emissions in gasoline engines using optimized port+direct injection are described. These embodiments include control of the amount of directly injected fuel so as to avoid a threshold increase in particulates due to piston wetting and reduction of cold start emissions by use of air preheating using variable valve timing.
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