INTERNAL COMBUSTION ENGINE AND CONTROL METHOD FOR SAME

摘要

An engine exhaust gas post-treatment device including a mechanism that can vary opening timing of an exhaust valve, and a control method. A unit is configured to raise a temperature of a part or all of the device to not less than a preset temperature by the mechanism opening the exhaust valve in an exhaust stroke at normal combustion within a range of an afterburning period, and the mechanism feeds the device an exhaust gas whose temperature and pressure are high due to combustion of fuel injected into a cylinder. After the exhaust gas is treated by the device, or when the device is regenerated, the unit adds an unburned fuel component to the exhaust gas by an additional injection of an injector in the cylinder or an injection of a hydrocarbon addition nozzle provided at an exhaust port in accordance with the valve opening timing by the unit.

主权项

1. An internal combustion engine that is provided with a post-treatment device of an exhaust gas, and a variable valve mechanism that can change valve opening timing of an exhaust valve, comprising:
a unit configured to raise a temperature of a part or all of the post-treatment device to not less than a preset temperature by the variable valve mechanism opening the exhaust valve that is opened in an exhaust stroke at the time of normal combustion within a range of an afterburning period, and feeding to the post-treatment device an exhaust gas whose temperature and pressure have become high by means of combustion of fuel injected into a cylinder, when the exhaust gas is treated by the post-treatment device, or when the post-treatment device is regenerated; and a unit configured to add an unburned fuel component to the exhaust gas by at least either an additional injection of an fuel injection valve in a cylinder or an injection of an addition valve provided in an exhaust passage in accordance with valve opening timing of the exhaust valve in the unit configured to perform temperature rise, after the temperature of the part or all of the post-treatment device is raised to not less than the preset temperature.