Exhaust gas purification system of internal combustion engine

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced by an increase of a temperature of the exhaust gas, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• determining circuitry for determining whether the spontaneous regeneration occurs or not based on the operating states of the engine;
• and
• controlling circuitry for completing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the determining circuitry determines that the spontaneous regeneration stops after a start of the spontaneous regeneration and if the deposition quantity becomes equal to or less than a predetermined reset value;
• wherein the controlling circuitry sets the predetermined reset value at a lower limit value of the deposition quantity of the exhaust particulate matters corresponding to a permissible limit value of a deposition variation of the exhaust particulate matters in the particulate filter, the deposition variation increasing as the regeneration progresses.

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced in the particulate filter by an increase of a temperature of the exhaust gas without control for increasing the exhaust gas temperature, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• distribution measuring circuitry for measuring a combustion distribution of the deposited exhaust particulate matters in the particulate filter;
• bias calculating circuitry for calculating a deposition bias indicating a deposition variation of the exhaust particulate matters in the particulate filter based on the combustion distribution in the particulate filter;
• and
• controlling circuitry for completely performing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the deposition bias exceeds a predetermined reference value.

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced by an increase of a temperature of the exhaust gas, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• distribution measuring circuitry for measuring a combustion distribution of the deposited exhaust particulate matters in the particulate filter;
• bias calculating circuitry for calculating a deposition bias indicating a deposition variation of the exhaust particulate matters in the particulate filter based on the combustion distribution in the particulate filter;
• and
• controlling circuitry for completing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the deposition bias exceeds a predetermined reference value;
• wherein the bias calculating circuitry accumulates combustion speeds of the exhaust particulate matters in multiple portions of the particulate filter and calculates a difference between a maximum value and a minimum value of the accumulated combustion speeds as the deposition bias.

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced by an increase of a temperature of the exhaust gas, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• distribution measuring circuitry for measuring a combustion distribution of the deposited exhaust particulate matters in the particulate filter;
• bias calculating circuitry for calculating a deposition bias indicating a deposition variation of the exhaust particulate matters in the particulate filter based on the combustion distribution in the particulate filter;
• and
• controlling circuitry for completing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the deposition bias exceeds a predetermined reference value;
• wherein the bias calculating circuitry accumulates combustion quantities of the exhaust particulate matters in multiple portions of the particulate filter and calculates a difference between a maximum value and a minimum value of the accumulated combustion quantities of the exhaust particulate matters as the deposition bias.

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced by an increase of a temperature of the exhaust gas, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• distribution measuring circuitry for measuring a combustion distribution of the deposited exhaust particulate matters in the particulate filter;
• bias calculating circuitry for calculating a deposition bias indicating a deposition variation of the exhaust particulate matters in the particulate filter based on the combustion distribution in the particulate filter;
• and
• controlling circuitry for completing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the deposition bias exceeds a predetermined reference value;
• temperature measuring circuitry for measuring the temperature in the particulate filter, wherein
• the distribution measuring circuitry calculates a combustion speed of the deposited exhaust particulate matters based on a correspondence between the temperature and the combustion speed.

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced in the particulate filter by an increase of a temperature of the exhaust gas without control for increasing the exhaust gas temperature, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• distribution measuring circuitry for measuring a combustion distribution of the deposited exhaust particulate matters in the particulate filter;
• quantity calculating circuitry for calculating a deposition quantity of the exhaust particulate matters at a maximum deposition portion in the particulate filter, where the deposition quantity is maximized in the particulate filter, based on the operating states of the engine including the combustion distribution in the particulate filter;
• and
• controlling circuitry for completely performing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the deposition quantity at the maximum deposition portion exceeds a predetermined reference value.

An exhaust gas purification system of an internal combustion engine including a particulate filter in an exhaust passage of the engine for collecting exhaust particulate matters contained in exhaust gas, the exhaust gas purification system being provided so that regeneration of the particulate filter for combusting and reducing the exhaust particulate matters deposited on the particulate filter is performed by spontaneous regeneration, in which the deposited exhaust particulate matters are spontaneously combusted and reduced by an increase of a temperature of the exhaust gas, and is performed by compulsory regeneration for compulsorily combusting and reducing the deposited exhaust particulate matters when a present deposition quantity of the deposited exhaust particulate matters, which is calculated based on operating states of the engine, exceeds a predetermined upper limit value, the exhaust gas purification system comprising:

• distribution measuring circuitry for measuring a combustion distribution of the deposited exhaust particulate matters in the particulate filter;
• quantity calculating circuitry for calculating a deposition quantity of the exhaust particulate matters at a maximum deposition portion in the particulate filter, where the deposition quantity is maximized in the particulate filter, based on the operating states of the engine including the combustion distribution in the particulate filter;
• and
• controlling circuitry for completing the compulsory regeneration to eliminate the deposited exhaust particulate matters if the deposition quantity at the maximum deposition portion exceeds a predetermined reference value;
• temperature measuring circuitry for measuring the temperature in the particulate filter, wherein
• the distribution measuring circuitry calculates a combustion speed of the exhaust particulate matters based on a correspondence between the temperature and the combustion speed.