System and Method for Regenerating Gasoline Particulate Filter

A system for regenerating a particulate filter mounted on an exhaust pipe of a gasoline engine, the gasoline engine comprising a plurality of cylinders and an ignition device for igniting fuel and air, the system comprising:

• a three-way catalyst device mounted on the exhaust pipe connected to the gasoline engine, and to oxidize or reduce exhaust gas exhausted from the gasoline engine;
• the particulate filter mounted on the exhaust pipe downstream of the three-way catalyst device and to trap particulate matter contained in the exhaust gas and regenerate the particulate matter by using heat of the exhaust gas;
• a differential pressure sensor mounted upstream and downstream of the particulate filter and to measure a pressure difference of the particulate filter;
• and
• a control portion to receive the measured pressure difference and control parameters so as to determine an amount of non-ignited fuel which is not ignited and flows to the three-way catalyst device among the fuel flowing into the plurality of cylinders.