Method and device for regenerating exhaust particulate filter in v-type internal combustion engine for vehicle

A device for regenerating exhaust particulate filters in a V-type internal combustion engine for a vehicle, wherein the V-type internal combustion engine is a spark-ignition-type engine, has a pair of banks and the exhaust particulate filters provided in respective exhaust passages of the pair of banks, and is connected with an automatic transmission, the device comprising:

• a controller configured to perform regeneration process for the exhaust particulate filters of the respective banks,
• wherein the controller is configured to:
• estimate a soot accumulation amount in each of the exhaust particulate filters of a corresponding one of the banks;
• and
• simultaneously start the regeneration process for the exhaust particulate filters of both the banks based on the soot accumulation amount of at least one of the exhaust particulate filters of the banks, and
• wherein the regeneration process is performed by retarding ignition timing of both the banks and increasing an engine rotational speed of the internal combustion engine by changing a transmission ratio of the automatic transmission.