Vehicle control method and vehicle control device

A method for controlling a vehicle comprising an internal combustion engine and an exhaust gas purification apparatus provided in an exhaust passage of the internal combustion engine, wherein the exhaust gas purification apparatus includes an exhaust particulate filter capable of trapping fine exhaust particles in exhaust gas, and a three-way catalyst positioned on a downstream side of the exhaust particulate filter, the method comprising:

• supplying, by an air pump via a secondary air introduction passage, oxygen to the exhaust particulate filter when the fine exhaust particles are accumulated in the exhaust particulate filter and a temperature of the exhaust particulate filter is equal to or higher than a predetermined temperature, when the internal combustion engine is being stopped during travel,
• wherein a supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine is set such that a heating value at a time when oxidation reaction of the fine exhaust particles accumulated in the exhaust particulate filter occurs becomes larger than a heat radiation quantity of the exhaust particulate filter,
• wherein the supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine is set according to an accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter and the temperature of the exhaust particulate filter, and
• wherein the supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine is set smaller as the accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter is larger, and wherein the supply quantity of the oxygen is an amount of oxygen calculated based on at least the accumulation quantity of the fine exhaust particles in the exhaust gas and the temperature of the exhaust particulate filter.

A device for controlling a vehicle, comprising:

• an internal combustion engine;
• an exhaust gas purification apparatus provided in an exhaust passage of the internal combustion engine, and including an exhaust particulate filter capable of trapping fine exhaust particles in exhaust gas, and a three-way catalyst positioned on a downstream side of the exhaust particulate filter;
• an air pump and a secondary air introduction passage capable of supplying oxygen to the exhaust particulate filter;
• an electronic control unit for estimating an accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter;
• an exhaust particulate filter temperature sensor for detecting a temperature of the exhaust particulate filter;
• and
• the electronic control unit being configured to supply oxygen to the exhaust particulate filter when the fine exhaust particles are accumulated in the exhaust particulate filter and the temperature of the exhaust particulate filter is equal to or higher than a predetermined temperature, when the internal combustion engine is being stopped during travel,
• wherein the electronic control unit is configured to set a supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine according to a temperature of the oxygen to be supplied to the exhaust particulate filter and the temperature of the exhaust particulate filter, or to set the supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine according to the accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter and the temperature of the exhaust particulate filter, and
• wherein the supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine is set smaller as the accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter is larger.

A device for controlling a vehicle, comprising:

• an internal combustion engine;
• an exhaust gas purification apparatus provided in an exhaust passage of the internal combustion engine, and including an exhaust particulate filter capable of trapping fine exhaust particles in exhaust gas, and a three-way catalyst positioned on a downstream side of the exhaust particulate filter;
• an air pump and a secondary air introduction passage capable of supplying oxygen to the exhaust particulate filter;
• an electronic control unit for estimating an accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter;
• an exhaust particulate filter temperature sensor for detecting a temperature of the exhaust particulate filter;
• and
• the electronic control unit being configured to supply oxygen to the exhaust particulate filter when the fine exhaust particles are accumulated in the exhaust particulate filter and the temperature of the exhaust particulate filter is equal to or higher than a predetermined temperature, when the internal combustion engine is being stopped during travel,
• wherein the electronic control unit is further configured to set a supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine such that a heating value at a time when oxidation reaction of the fine exhaust particles accumulated in the exhaust particulate filter occurs becomes larger than a heat radiation quantity of the exhaust particulate filter, wherein the supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine is set according to the accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter and the temperature of the exhaust particulate filter, and
• wherein the supply quantity of the oxygen to be supplied to the exhaust particulate filter during stopping of the internal combustion engine is set smaller as the accumulation quantity of the fine exhaust particles trapped in the exhaust particulate filter is larger.