Control device for internal combustion engine
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United States of America Patent
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Jun 12, 2018
Issued Date -
Dec 1, 2016
app pub date -
May 23, 2016
filing date -
May 25, 2015
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Abstract
An internal combustion engine is provided with an EGR device and is configured to be capable of executing an operation based on a first air-fuel ratio and an operation based on a second air-fuel ratio leaner than the first air-fuel ratio. In a case where an ECU decreases the amount of air flowing into a combustion chamber and decreases an EGR rate in response to a predetermined torque reduction request for the internal combustion engine, the ECU performs the operation based on the first air-fuel ratio in a case where an immediately preceding EGR rate immediately before the torque reduction request is made is lower than a first threshold and performs a stratified combustion operation based on the second air-fuel ratio in a case where the immediately preceding EGR rate is equal to or higher than the first threshold.
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