Regeneration of particulate filter

A regeneration device for a filter which traps particulate matter in an exhaust gas of an engine, comprising:

• means for storing a map which defines a low load region relating to engine running points,
• means for detecting an engine running point containing an engine load,
• means for computing a deposition amount of particulate matter in the filter based on the detected engine running point,
• means for determining whether or not the detected engine running point is in the low load region referring to the map, when the deposition amount of particulate matter is more than a first reference amount,
• means for immediately raising a temperature of the exhaust gas, when the detected engine running point is not in the low load region, and
• means for raising the temperature of the exhaust gas after the deposition amount of particulate matter exceeds a second reference amount, when the detected engine running point is in the low load region,
• wherein the second reference amount is larger than the first reference amount.

A regeneration method for regenerating a filter which traps particulate matter in an exhaust gas of an engine, comprising:

• storing a map which defines a low load region relating to engine running points,
• detecting an engine running point containing an engine load,
• computing a deposition amount of particulate matter in the filter based on the detected engine running point,
• determining whether or not the detected engine running point is in the low load region referring to the map, when the deposition amount of particulate matter is more than a first reference amount,
• immediately raising a temperature of the exhaust gas, when the detected engine running point is not in the low load region, and
• raising the temperature of the exhaust gas after the deposition amount of particulate matter exceeds a second reference amount, when the detected engine running point is in the low load region,
• wherein the second reference amount is larger than the first reference amount.