DECEL FUEL CUT-OFF
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United States of America Patent
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Issued Date -
Nov 9, 2017
app pub date -
Apr 18, 2017
filing date -
May 4, 2016
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Abstract
Various methods and arrangements for improving fuel economy in decel fuel cut-off (DFCO) operation of an internal combustion engine are described. In one aspect, a catalytic converter bypass valve diverts the pumped air in DFCO mode from flowing through a catalytic converter. The diverted, pumped air may flow through a bypass line or be returned to the engine intake manifold through an exhaust gas recirculation return line. Another aspect of the invention relates to directing the diverted pumped air through an emission control device.
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