Control device and method for turbocharged engine
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United States of America Patent
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Aug 4, 2020
Grant Date -
Apr 25, 2019
app pub date -
Oct 18, 2018
filing date -
Oct 23, 2017
priority date (Note) -
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Abstract
A smooth shift is achieved between an operating region in which a first turbocharger is mainly operated and an operating region in which a second turbocharger is mainly operated. A PCM controls a throttle valve to use a first supercharging region in which a gas flow through an exhaust bypass passage is reduced and a second supercharging region in which the gas flow through the exhaust bypass passage is promoted differently based on the operating state of an engine. In an early stage of a shift from the first supercharging region to the second supercharging region, the PCM executes bridge control to allow the flow velocity of exhaust gas flowing into a large turbine to be higher than at a point in time at which the shift starts.
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