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.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority to and the benefit of Korean Patent Application No. 10-2014-0170351 filed on Dec. 2, 2014, the entire contents of which is incorporated herein for all purposes by this reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method of regenerating a particulate filter of a diesel hybrid vehicle which can reduce fuel consumption using a diesel engine and a driving motor and can reduce environmental pollution by decreasing a discharge amount of particulate matter in exhaust gas.[0004]2. Description of Related Art[0005]In general, as methods of regenerating diesel particulate matter, there are a passive type that uses only exhaust gas for regeneration without a specific heat source and a forcible type that burns particulate matter by forcibly supplying a chemical heat source.[0006]As for the passive type, there are a type of using an oxidation catalyst...

AI Technical Summary

Benefits of technology

The invention provides a way to regenerate the in-vehicle filter that helps reduce harmful emissions in diesel hybrid vehicles, while also reducing fuel consumption and cost. This is done by increasing the temperature of the exhaust gas through a main injection increase and recovery of excess torque through an HSG or driving motor. The recovered excess torque is then stored in a battery, resulting in easier reduction of fuel consumption.

Problems solved by technology

Meanwhile, a process of increasing the temperature of an exhaust gas is performed to regenerate a particulate filter in the diesel hybrid vehicle, but when post-injection is performed in order to increase the temperature of an exhaust gas, as described above, there is little change in output and fuel consumption increases instead.

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