Control method for an exhaust gas purification system and an exhaust gas purification system

• US 7,421,837 B2
• Filed: 03/18/2005
• Issued: 09/09/2008
• Est. Priority Date: 04/08/2004
• Status: Active Grant

• Current Assignee: Isuzu Motors Limited
• Original Assignee: Isuzu Motors Limited
• Inventors: Abe, Kouzo
• Primary Examiner(s): NGUYEN, TU MINH
• Application Number:
  US11/082,824
• Publication Number:
  US 20050223700A1
• Time in Patent Office: 1,271 Days
• Field of Search: 602/74, 602/77, 602/86, 602/85, 602/95, 602/97, 603/11, 55D/IG.30
• US Class Current: 60/295
• CPC Class Codes: F01N 3/0231 using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 2200/0812 Particle filter loading
• CPC Class Codes: F02D 2250/11 Oil dilution, i.e. prevention thereof or special controls according thereto
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02D 41/405 with post injections
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

In an exhaust gas purification system with a continuous regeneration type DPF device, when a collecting quantity (ΔPm) of PM exceeds a predetermined judgment collecting quantity (ΔPm0), a number-of-regeneration-times coefficient (Rc) serving as an index of the number of regeneration times to a travel distance is compared with a predetermined judgment coefficient value (R0). When the number-of-regeneration-times coefficient (Rc) is smaller than the predetermined judgment coefficient value (R0), automatic traveling regeneration is performed. If this condition is not met, manual regeneration is performed.

Claims

1. A control method for an internal combustion engine in a vehicle, the internal combustion engine comprising a continuous regeneration type diesel particulate filter device, the method comprising:

comparing a number-of-regeneration-times coefficient as an index of a number of regenerating operations of the filter device to a travel distance of the vehicle with a predetermined judgment coefficient value when a detected quantity of collected matters of the filter device exceeds a predetermined judgment correcting quantity;

performing a travel automatic regeneration when the number-of-regeneration-times coefficient is smaller than the predetermined judgment coefficient value; and

warning a driver of the vehicle to actuate forced regeneration control when the number-of-regeneration-times coefficient is not less than the predetermined judgment coefficient value.

2. A control method for an exhaust gas purification system, in an internal combustion engine mounted on a vehicle provided with a continuous regeneration type diesel particulate filter device in an exhaust passage thereof, the method comprising:

detecting a quantity of collected matters in the continuous regeneration type diesel particulate filter device;

detecting a travel distance of the vehicle;

performing a post injection in a fuel injection into a cylinder of the internal combustion engine to raise a temperature of the exhaust gas and forcibly burning the collected matters, thereby regenerating the continuous regeneration type diesel particulate filter device;

warning a driver of the vehicle to actuate a forced regeneration control when it is detected that the detected quantity of the collected matters is larger than a predetermined judgment collecting quantity;

counting a number of the regenerating operations

comparing a number-of-regeneration-times coefficient as an index of the number of regenerating operations to the travel distance with a predetermined judgment coefficient value when the detected quantity of collected matters exceeds the predetermined judgment correcting quantity;

performing a travel automatic regeneration when the number-of-regeneration-times coefficient is smaller than the predetermined judgment coefficient value; and

warning the driver of the vehicle to actuate the forced regeneration control when the number-of-regeneration-times coefficient is not less than the predetermined judgment coefficient value.

3. The control method of claim 2, further comprising judging an oil dilution condition according to the travel distance, the number of regenerating operations and the number-of-regeneration-times coefficient.

4. An exhaust gas purification system, in an internal combustion engine mounted on a vehicle provided with a continuous regeneration type diesel particulate filter device in the exhaust passage thereof;

having a diesel particulate filter control means including;

a collecting quantity detection means for detecting the collecting quantity of collected matters in the continuous regeneration type diesel particulate filter device,

a travel distance detection means for detecting the travel distance of the vehicle,

a forced regeneration control means for performing post injection in a fuel injection control into a cylinder to raise an exhaust gas temperature, forcibly burning the collected matters and regenerating the continuous regeneration type diesel particulate filter device,

a warning means for warning a driver so as to prompt the actuation of the forced regeneration control means when it is detected that the collecting quantity detected by the collecting quantity detection means is larger than a predetermined judgment collecting quantity,

and a number-of-regeneration times detection means for counting the number of regeneration times by the forced regeneration control means,

wherein when the collecting quantity of the collected matters detected by the collecting quantity detection means exceeds the predetermined judgment collecting quantity, the diesel particulate filter control means compares a number-of-regeneration-times coefficient as an index of the number of regeneration times to a travel distance with a predetermined judgment coefficient value, performs the automatic travel regeneration when the number-of-regeneration-times coefficient is smaller than the predetermined judgment coefficient value, and warns the driver to prompt the actuation of the forced regeneration control means when the number-of-regeneration-times coefficient is not less than the predetermined judgment coefficient value.