Adjusted ignition timing for engine restart
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United States of America Patent
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Jul 25, 2023
Grant Date -
Sep 15, 2022
app pub date -
Mar 9, 2021
filing date -
Mar 9, 2021
priority date (Note) -
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Abstract
Methods and systems are provided for restarting an engine following an engine idle-stop. In one example, a method may include, prior to an engine restart following an idle-stop, adjusting a spark ignition timing based on an estimation of a fuel-air equivalence ratio (phi) and an estimation of a cylinder turbulence. Optimal spark ignition timing based on estimated phi and cylinder turbulence during engine restart may result in stabilized combustion and a torque output sufficient to at least partially relieve demand on the starting device.
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