Regeneration control system

A regeneration control system for an engine comprising:

• an exhaust particulate collecting section configured to collect particulate matter from exhaust gas from the engine;
• a regeneration control section configured to conduct regeneration control for at least oxidizing the particulate matter collected by the exhaust particulate collecting section;
• and
• a control unit configured to adjust during the regeneration control at least one of a target filter temperature, a target exhaust air-fuel ratio, and a target regeneration control time in the regeneration control for oxidizing the particulate matter collected by the exhaust particulate collecting section in accordance with a decrease in the particulate matter collected by the exhaust particulate collecting section associated with the regeneration control,
• the control unit being configured to increase the target filter temperature during the regeneration control, to make the target exhaust air-fuel ratio leaner during the regeneration control, and to lengthen the target regeneration control time during the regeneration control for subsequent increases in the target filter temperature and subsequent adjustments of the target exhaust air-fuel ratio to the leaner value in accordance with the decrease in the particulate matter collected by the exhaust particulate collecting section.

A regeneration control system for an engine comprising:

• an exhaust particulate collecting section configured to collect particulate matter from exhaust gas from the engine;
• a regeneration control section configured to conduct regeneration control for at least oxidizing the particulate matter collected by the exhaust particulate collecting section;
• and
• a control unit configured to adjust during the regeneration control at least one of a target filter temperature, a target exhaust air-fuel ratio, and a target regeneration control time in the regeneration control for oxidizing the particulate matter collected by the exhaust particulate collecting section in accordance with a decrease in the particulate matter collected by the exhaust particulate collecting section associated with the regeneration control,
• the control unit being further configured to perform the regeneration control via a combustion mode composed of a preliminary combustion that is performed at least once in a vicinity of the top dead center, and a main combustion that is initiated after the preliminary combustion has been entirely completed to generate a main torque.

A regeneration control system for an engine comprising:

• an exhaust particulate collecting section configured to collect particulate matter from exhaust gas from the engine;
• a regeneration control section configured to conduct regeneration control for at least oxidizing the particulate matter collected by the exhaust particulate collecting section;
• and
• a control unit configured to adjust during the regeneration control at least a target exhaust air-fuel ratio for oxidizing the particulate matter collected by the exhaust particulate collecting section in accordance with a decrease in the particulate matter collected by the exhaust particulate collecting section associated with the regeneration control,
• the control unit being further configured to perform the regeneration control via a combustion mode composed of at least two preliminary combustions with one of the preliminary combustions being performed in a vicinity of the top dead center, and a main combustion that is initiated after the preliminary combustions have been entirely completed to generate a main torque.

A regeneration control system for an engine comprising:

• an exhaust particulate collecting section configured to collect particulate matter from exhaust gas from the engine;
• a regeneration control section configured to conduct regeneration control for at least oxidizing the particulate matter collected by the exhaust particulate collecting section;
• and
• a control unit configured to adjust during the regeneration control at least one of a target filter temperature, a target exhaust air-fuel ratio, and a target regeneration control time in the regeneration control for oxidizing the particulate matter collected by the exhaust particulate collecting section in accordance with a decrease in the particulate matter collected by the exhaust particulate collecting section associated with the regeneration control,
• the control unit being further configured to perform the regeneration control via a combustion mode composed of at least two preliminary combustions with one of the preliminary combustions being performed in a vicinity of the top dead center, and a main combustion that is initiated after the preliminary combustions have been entirely completed to generate a main torque.

A regeneration control system for an engine comprising:

• exhaust particulate collecting means for collecting particulate matter from exhaust gas from the engine;
• regeneration control means for conducting regeneration control for oxidizing the particulate matter collected by the exhaust particulate collecting means;
• and
• control means for adjusting at least a target exhaust air-fuel ratio for oxidizing the particulate matter collected by the exhaust particulate collecting means in accordance with a decrease in the exhaust particles collected by the exhaust particulate collecting means associated with the regeneration control, the control means further including a function for adjusting the target exhaust air-fuel ratio to a leaner value during the regeneration control in accordance with the decrease in the particulate matter collected by the exhaust particulate collecting means.

A method of regenerating an exhaust particulate collecting section of an engine comprising:

• collecting particulate matter from exhaust gas from the engine;
• conducting regeneration control for oxidizing the particulate matter collected by the exhaust particulate collecting section;
• and
• adjusting at least a target exhaust air-fuel ratio for oxidizing the particulate matter collected by the exhaust particulate collecting section in accordance with a decrease in the exhaust particles collected by the exhaust particulate collecting section associated with the regeneration control by adjusting the target exhaust air-fuel ratio to a leaner value during the regeneration control in accordance with the decrease in the collected particulate matter.