Method for determining start and end points of regeneration of diesel soot-filtering device

Abstract

Disclosed herein is a method for determining start and end points of regeneration of a diesel soot-filtering device, which measures a value (hereinafter, referred to as “flow resistance value”) obtained by dividing a difference between pressures at front and rear ends of a diesel soot-filtering device by the flow rate of exhaust gas so as to determine the degree of accumulated amount of soot, so that the start and end points of a compulsory regeneration of the soot-filtering device can be easily determined.

1 . A method for determining start and end points for regeneration of a diesel soot-filtering device, comprising the steps of: 
 measuring a flow resistance value varying depending upon an amount (SL) of soot accumulated in the soot-filtering device regardless of conditions of an engine and a vehicle;    saving the amount (SL) of accumulated soot and the measured corresponding flow resistance value (FR1);    setting the flow resistance value (FR1) corresponding to the saved amount (SL) of soot as a reference of the start point of a compulsory regeneration of the soot-filtering device;    measuring a flow resistance value (FR2) in a real vehicle, and at the same time, computing and identifying the amount (SL) of soot corresponding to the measured flow resistance value (FR2); and    comparing the flow resistance value (FR2) in the real vehicle and the corresponding flow resistance value (FR1) of the identified amount (SL) of soot, whereby the start and end points of a compulsory regeneration of the soot-filtering device are determined, and simultaneously whether the soot-filtering device is compulsorily regenerated is determined.    
   
   
       2 . The method of  claim 1 , wherein: 
 said saving comprises storing data in a storage and computation means;    said computing and identifying amount (SL) is performed through said storage and computation means; and    said comparing of flow resistance values comprises computing and comparing said valves through said storage and computation means.    
   
   
       3 . The method according to  claim 2 , wherein the storage and computation means is an ECU, compares the flow resistance value (FR2) measured in a real vehicle with the previously stored corresponding flow resistance value (FR1), and when the measured flow resistance value (FR2) is identical to the previously stored corresponding flow resistance value (FR1), determines that a current regeneration start point is the start point of the compulsory regeneration while compulsorily regenerating the soot-filtering device.