CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

An EGR device is operated and EGR is executed, when a temperature of a first cooling water that cools a cylinder block and a cylinder head is higher than an EGR allowable temperature, and a working point of the internal combustion engine that is fixed by a load and an engine speed is in an EGR execution region. The EGR execution region is variable with respect to a temperature of the second cooling water (the temperature of the second cooling water is lower than the first cooling water) that cools the intake port, and the EGR execution region is narrowed to a high load side in a case where the temperature of the second cooling water is lower than a threshold value temperature, as compared with a case where the temperature of the second cooling water is higher than the threshold value temperature.

主权项

1. A control device for an internal combustion engine including
a first cooling water circulation system that cools a cylinder block and a cylinder head by a first cooling water, a second cooling water circulation system that cools an intake port that is formed in the cylinder head by a second cooling water having a lower temperature than the first cooling water, and an EGR device that recirculates exhaust gas into an intake passage, and a processor unit is configured
to operate the EGR device and execute EGR, when a temperature of the first cooling water is higher than an EGR allowable temperature, and a working point of the internal combustion engine that is fixed by a load and an engine speed is in an EGR execution region; andto decrease an EGR amount in a predetermined region at a low load side in the EGR execution region in a case where a temperature of the second cooling water is lower than a threshold value temperature, as compared with a case where the temperature of the second cooling water is higher than the threshold value temperature.