Exhaust gas purification system

• US 8,961,668 B2
• Filed: 05/16/2011
• Issued: 02/24/2015
• Est. Priority Date: 05/25/2010
• Status: Active Grant

• Current Assignee: Isuzu Motors Limited
• Original Assignee: Isuzu Motors Limited
• Inventors: Haseyama, Takashi, Gotou, Shinji, Oohira, Hiroyuki
• Primary Examiner(s): ORLANDO, AMBER ROSE
• Application Number:
  US13/699,499
• Publication Number:
  US 20130068107A1
• Time in Patent Office: 1,380 Days
• Field of Search: 55522-524, 954/25, 422169-172, 422177-182
• US Class Current: 96/425
• CPC Class Codes: B01D 2279/30 for treatment of exhaust gases from IC Engines
• CPC Class Codes: B01D 46/42 Auxiliary equipment or operation thereof
• CPC Class Codes: B01D 46/44 controlling filtration
• CPC Class Codes: B01D 46/66 Regeneration of the filtering material or filter elements inside the filter B01D46/04, B01D46/48 take precedence
• CPC Class Codes: F01N 2900/1606 Particle filter loading or soot amount
• CPC Class Codes: F01N 3/0238 for regenerating during engine standstill
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: F02D 2200/0812 Particle filter loading
• CPC Class Codes: F02D 2200/604 Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02D 41/08 for idling F02D41/06, F02D41/16 take precedence
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An exhaust gas purification system with which a frequency of diesel particulate filter (“DPF”) regeneration requests can be reduced during long low idle regeneration, thereby improving convenience, including a control unit that performs regeneration control on a DPF provided at an exhaust pipe of an engine. The control unit includes a particulate matter (“PM”) accumulation amount predictor for predicting the amount of PM accumulated by calculating a cumulated value of the PM in an idling state. The control unit starts calculating the cumulated value of the PM by the PM accumulation amount predictor after a first predetermined time has elapsed since a detection of the idling state.

Claims

1. An exhaust gas purification system, comprising:

a control device configured to perform regeneration control on a diesel particulate filter that is provided to an exhaust pipe of a vehicle engine,

wherein the control device includes a part for detecting an idling state of the engine, a part for predicting an amount of particulate matter accumulated at the diesel particulate filter by calculating a cumulated value of the particulate matter for the detected engine idling state, and a long low idle regeneration part,

wherein, only after the detection of the engine idling state by the part for detecting the idling state, and then after a first predetermined time has elapsed, the control device starts calculating the cumulated value of the particulate matter by the particulate matter accumulation amount predicting part, and starts performing the regeneration control via the long low idle regeneration part, when the predicted cumulated value of the particulate matter has reached a predetermined value or greater.

2. The exhaust gas purification system according to claim 1, wherein the first predetermined time is set equal to or longer than a second predetermined time.

3. The exhaust gas purification system according to claim 1 wherein the control device measures a time starting from when the predicted cumulated value of the particulate matter has reached the predetermined value or greater, and starts performing the regeneration control when the measured time has passed a second predetermined time.

4. The exhaust gas purification system according to claim 2 wherein the control device measures a time starting from when the predicted cumulated value of the particulate matter has reached the predetermined value or greater, and starts performing the regeneration control when the measured time has passed a second predetermined time.

5. The exhaust gas purification system according to claim 3, wherein the second predetermined time is set equal to or longer than a third predetermined time.

6. The exhaust gas purification system according to claim 4, wherein the second predetermined time is set equal to or longer than the third predetermined time.

7. An exhaust gas purification method for performing regeneration control on a diesel particulate filter that is provided to an exhaust pipe of a vehicle engine, comprising:

detecting an idling state of the engine,

only after the detection of the engine idling stated and then after a first predetermined time has elapsed, predicting an amount of particulate matter accumulated at the diesel particulate filter by calculating a cumulated value of the particulate matter for the detected engine idling state, and

starting performance of the regeneration control when the predicted cumulated value of the particulate matter has reached a predetermined value or greater.