SYSTEM AND METHOD OF DPF PASSIVE ENHANCEMENT THROUGH POWERTRAIN TORQUE-SPEED MANAGEMENT

• US 20120216509A1
• Filed: 02/28/2012
• Published: 08/30/2012
• Est. Priority Date: 02/28/2011
• Status: Active Grant

• Current Assignee: Cummins Intellectual Property, Inc. (Cummins Incorporated), Eaton Corp. (Wisconsin) (Eaton Corporation PLC.), PACCAR Incorporated
• Original Assignee: Cummins Intellectual Property, Inc. (Cummins Incorporated)
• Inventors: Sujan, Vivek A., Frazier, Timothy R.
• Granted Patent: US 9,194,318 B2
• Time in Patent Office: Days
• US Class Current: 60/274
• CPC Class Codes: F01N 3/0232 removing incombustible material from a particle filter, e.g. ash
• CPC Class Codes: F01N 3/0253 adding fuel to exhaust gases
• CPC Class Codes: F01N 3/035 with catalytic reactors , e.g. catalysed diesel particulate filters
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: F02D 2200/701 Information about vehicle position, e.g. from navigation system or GPS signal
• 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

Abstract

This disclosure provides a method and system for determining recommendations for vehicle operation that reduce soot production in view of a diesel particulate filter (DPF) of an exhaust aftertreatment system. Recommendations generated can reduce excessive particulate matter (PM) production during transient engine events and provide for operating conditions favorable for passive regeneration. In this way, less frequent active regeneration of the DPF is needed and/or more opportunities are provided for passive regeneration. The system and method can utilize location and terrain information to anticipate and project a window of operation in view of reducing soot production and soot loading of the DPF, or provide the operator with instruction when such opportunities are present or will soon be encountered.

Claims

1. A method to enhance the passive regeneration of a diesel particulate filter (DPF), the method comprising:

receiving current operating data indicative of a vehicle current operating state based on at least two of power demand, engine speed, engine torque, gear number, and vehicle speed;

receiving terrain data indicative of terrain variation;

determining a vehicle target operating state based on engine exhaust particulate matter (PM) and engine transients; and

providing an engine speed and transmission gear shift recommendation based on said vehicle target operating state to reduce at least one of said engine exhaust PM and said engine transients.

2. The method of claim 1, wherein the terrain variation is based on current vehicle location.

3. The method of claim 1, wherein the terrain variation is based on upcoming vehicle location.

4. The method of claim 1, wherein reducing said engine transients is determined on a per cylinder basis.

5. The method of claim 1, wherein said operating state is determined based on an estimated exhaust PM level present in the DPF.

6. The method of claim 1, wherein said engine speed and transmission gear shift recommendation is provided to an engine control module (ECM).

7. The method of claim 1, further comprising:

estimating a soot load an amount of engine exhaust PM in the DPF, wherein said target operating state module is determined based on said soot load estimate.

8. The method of claim 1, further comprising:

receiving positioning related data; and

determining a position coordinate of a vehicle within said terrain variation.

9. The method of claim 5, further comprising:

visibly or audibly indicating said engine speed and transmission gear shift recommendation.

11. The system of claim 5, further comprising:

a soot load estimate (SLE) module configured to estimate an amount of engine exhaust PM in the DPF, wherein said target operating state module is determined based on said estimate.

12. The system of claim 5, further comprising:

a position coordinate determining module configured to receive data related to positioning and determine a vehicle position within said terrain variation.

13. The system of claim 5, further comprising:

an interface module configured to visibly or audibly indicate at least one of said engine speed and transmission gear shift recommendations.

10. A system adapted to enhance the passive regeneration of a diesel particulate filter (DPF), comprising:

a current operating state module including current operating state data indicative of a vehicle current operating state based on at least two of power demand, engine speed, engine torque, gear number, and vehicle speed;

a terrain variation module including terrain data indicative of terrain variation;

a target operating state module configured to determine a vehicle target operating state based on engine exhaust particulate matter (PM) and engine transients; and

a recommendation module containing engine speed and transmission gear shift recommendations corresponding to said determined operating state to reduce said engine exhaust PM and said engine transients.