Method for regenerating a particle filter during the operation of an internal combustion engine

• US 10,221,744 B2
• Filed: 01/27/2015
• Issued: 03/05/2019
• Est. Priority Date: 02/25/2014
• Status: Active Grant

• Current Assignee: Rolls-Royce Solutions GmbH (Rolls-Royce Holdings Plc)
• Original Assignee: MTU Friedrichshafen GmbH (Rolls-Royce Holdings Plc)
• Inventors: Muller, Ralf
• Primary Examiner(s): Lee, Brandon D
• Application Number:
  US15/120,027
• Publication Number:
  US 20170067384A1
• Time in Patent Office: 1,498 Days
• CPC Class Codes: F01N 11/007 the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
• CPC Class Codes: F01N 2590/02 for marine vessels or naval applications
• CPC Class Codes: F01N 2590/08 for heavy duty applications, e.g. trucks, buses, tractors, locomotives
• CPC Class Codes: F01N 2590/10 for stationary applications
• CPC Class Codes: F01N 2900/12 said parameters being related to the vehicle exterior
• CPC Class Codes: F01N 2900/1606 Particle filter loading or soot amount
• CPC Class Codes: F01N 3/023 using means for regenerating the filters, e.g. by burning trapped particles by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 3/025 using fuel burner or by adding fuel to exhaust
• 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 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for regenerating a particle filter during the operation of an internal combustion engine, having the following steps: detecting at least one loading parameter which is characteristic of a present loading of the particle filter, wherein an active regeneration measure can be carried out recurrently in a manner dependent on the loading parameter; determining a time window for a regeneration of the particle filter; and determining a prediction for an operating state of the internal combustion engine expected within the time window, wherein the active regeneration measure at a time indicated for it by the loading parameter is skipped if the prediction predicts that, within the time window, an operating state of the internal combustion engine will arise in which a regeneration of the particle filter takes place without an active regeneration measure.

Claims

1. A method for regenerating a particle filter during operation of an internal combustion engine, comprising the steps of:

recording at least one loading parameter that is characteristic of a current loading of the particle filter, wherein an active regeneration measure can be performed recurrently depending on the loading parameter;

determining a time window for a regeneration of the particle filter;

predicting an operating state of the internal combustion engine that is to be expected within the time window;

actively regenerating the particle filter depending on the load parameters; and

,

skipping the active regeneration measure at a point in time indicated by the loading parameter when the prediction predicts an operating state of the internal combustion engine within the time window in which a regeneration of the particle filter will take place without the active regeneration measure,

wherein the prediction is determined by recording at least one operating parameter of the internal combustion engine that is characteristic of an operating state of said engine over a recording time period, wherein a load on the internal combustion engine that is to be expected within the time window is determined using a profile of the operating parameter in the recording time.

2. The method according to claim 1, wherein the active regeneration measure for regenerating the particle filter is initiated when indicated by the loading parameter and when at the same time the prediction predicts no operating state of the internal combustion engine within the time window in which a regeneration of the particle filter will take place without an active regeneration measure.

3. The method according to claim 1, wherein the recording step includes recording at least one of:

a running time of the internal combustion engine, a mileage of the internal combustion engine, an exhaust gas counter pressure at the particle filter, a pressure difference across the particle filter and a soot loading of the particle filter.

4. The method according to claim 1, wherein the time window is determined by determining a soot loading rate of the particle filter, wherein the time window is a time still remaining until reaching a previously determined critical soot loading at the determined soot loading rate.

5. The method according to claim 1, wherein the prediction is determined by determining a load on the internal combustion engine that is to be expected within the time window using position data of the internal combustion engine.

6. The method according to claim 5, wherein the position data is determined by satellite-based navigation.

7. The method according to claim 1, wherein the profile of the operating parameter in the recording time period is subjected to pattern recognition.

8. The method according to claim 1, including recording at least one of:

a revolution rate, a load, a fuel injection quantity, an exhaust gas temperature, an exhaust gas mass flow, an exhaust gas volumetric flow, a measurement value of a lambda probe, a concentration of oxides of nitrogen in exhaust gas, a concentration of nitrogen dioxide in exhaust gas, a ratio of a concentration of nitrogen dioxide to a total concentration of oxides of nitrogen in exhaust gas, an oxygen concentration in exhaust gas, a particle concentration in exhaust gas, an exhaust gas counter pressure upstream of the particle filter and a pressure difference falling across the particle filter as the loading parameter.

9. A control unit configured to implement the method according to claim 1.

10. An internal combustion engine, comprising:

an exhaust gas aftertreatment system having a particle filter;

a combustion chamber; and

a control unit according to claim 9.

11. The internal combustion engine according to claim 10, wherein the internal combustion engine is configured for driving a motor vehicle or as a static internal combustion engine.