Patent ID: 8640446

Claim:
An exhaust gas purification device having a gasoline particulate filter that is disposed on an exhaust pipe of a gasoline engine, comprising: the engine that includes a plurality of cylinders of which at least one thereof is selectively deactivated; the gasoline particulate filter that is disposed on the exhaust pipe that is connected to the engine so as to trap particulate matter of exhaust gas of the engine; pressure difference sensors that are respectively disposed at a downstream side and an upstream side of the gasoline particulate filter to measure a pressure difference of the gasoline particulate filter; and an electronic control unit (ECU) that receives the measured pressure difference from the pressure difference sensors and detected control parameters through a control parameter measuring portion to determine cylinders to be deactivated, and that supplies the gasoline particulate filter with air through the deactivated cylinders so as to regenerate the gasoline particulate filter: wherein the ECU terminates regeneration by reactivating the deactivated cylinders during an over-run condition of the engine.