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

• US 20050223700A1
• Filed: 03/18/2005
• Published: 10/13/2005
• Est. Priority Date: 04/08/2004
• Status: Active Grant

• Current Assignee: Isuzu Motors Limited
• Original Assignee: Isuzu Motors Limited
• Inventors: Abe, Kouzo
• Granted Patent: US 7,421,837 B2
• Time in Patent Office: Days
• 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 (1) provided with a continuous regeneration type DPF device (13) and DPF control means (30C), when a collecting quantity (ΔPm) of PM exceeds the 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 and when the number-of-regeneration-times coefficient (Rc) is equal to or more than the predetermined judgment coefficient value (R0), manual regeneration is performed.

Thereby, in the case of regeneration of the continuous regeneration type DPF device (13) of the exhaust gas purification system (1), it is possible to greatly decrease the frequency of manual regeneration in which a driver stops a vehicle to perform forced regeneration by a manual regeneration switch and improve the operability for the driver. Moreover, it is possible to solve the oil dilution problem due to a lot of unburned oil injected for DPF regeneration.

Claims

1. 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 the exhaust passage thereof, having a diesel particulate filter control means including;

a collecting quantity detection means for detecting the collecting quantity of the 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 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, a number-of-regeneration-times coefficient as an index of the number of regeneration times to a travel distance is compared with a predetermined judgment coefficient value;

when the number-of-regeneration-times coefficient is smaller than the predetermined judgment coefficient value, a travel automatic regeneration is performed, and when the number-of-regeneration-times coefficient is not less than the predetermined judgment coefficient value, the warning is given to the driver to prompt the actuation of the forced regeneration control means.

2. 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.