Particulate filter regeneration method of diesel hybrid vehicle

Abstract

A method of regenerating a particulate filter of a diesel hybrid vehicle includes determining whether a regeneration condition for a particulate filter that filters particulate matter in an exhaust gas discharged from an engine may be satisfied, entering a mode for increasing the temperature of the exhaust gas when the regeneration condition may be satisfied, increasing output torque of the engine to increase the temperature of the exhaust gas, determining redundant torque by subtracting demand torque from the increased output torque of the engine, generating electricity by a motor by using the redundant torque, and storing the electricity generated by the motor in a battery.

What is claimed is: 
     
         1 . A method of regenerating a particulate filter of a diesel hybrid vehicle, comprising:
 determining whether a regeneration condition for the particulate filter that filters particulate matter in an exhaust gas discharged from an engine is satisfied;   entering a mode for increasing a temperature of the exhaust gas when the regeneration condition is satisfied;   increasing output torque of the engine to increase the temperature of the exhaust gas;   determining a redundant torque by subtracting a demand torque from the increased output torque of the engine;   generating electricity by a motor by using the determined redundant torque; and   storing the electricity generated by the motor in a battery.   
     
     
         2 . The method of  claim 1 , wherein a main injection amount of an injector is configured to be increased to increase the output torque. 
     
     
         3 . The method of  claim 1 , wherein the motor is a Hybrid Starter and Generator (HSG) that starts the engine or generates the electricity using torque from the engine. 
     
     
         4 . The method of  claim 1 , wherein the motor is a driving motor that transmits torque to driving wheels, together with the engine. 
     
     
         5 . The method of  claim 1 , wherein the regeneration condition for the particulate filter is determined on a basis of a front-rear pressure difference of the particulate filter or a driving distance. 
     
     
         6 . The method of  claim 4 , wherein the engine rotates front wheels and the motor rotates rear wheels. 
     
     
         7 . The method of  claim 4 , wherein the engine is connected with the motor through an engine clutch and the motor rotates front wheels through a transmission. 
     
     
         8 . The method of  claim 1 , further comprising performing post-injection when the temperature of the exhaust gas does not reach a predetermined level. 
     
     
         9 . The method of  claim 1 , wherein, in the increasing the output torque of the engine, RPM of the engine is not corrected. 
     
     
         10 . A diesel hybrid vehicle comprising a controller for performing the method of  claim 1 .