Method for determining the charge state of a particle filter installed in the exhaust gas line of an internal combustion engine and device for reducing the particle emissions of an internal combustion engine

• US 8,152,912 B2
• Filed: 03/06/2009
• Issued: 04/10/2012
• Est. Priority Date: 03/15/2008
• Status: Expired due to Fees

• Current Assignee: HJS Emission Technology GmbH & Co. KG
• Original Assignee: HJS Emission Technology GmbH & Co. KG
• Inventors: Schrewe, Klaus, Mandt, Rüdiger
• Primary Examiner(s): Smith, Duane
• Assistant Examiner(s): Orlando, Amber
• Application Number:
  US12/922,842
• Publication Number:
  US 20110036070A1
• Time in Patent Office: 1,131 Days
• Field of Search: 55522-524, 422169-172, 422177-182, 602/74, 602/95, 602/97, 95/20, 95/19, 95/23, 302/74, 302/95, 302/97, 964/17, 964/20, 964/22
• US Class Current: 96/421
• CPC Class Codes: F01N 2260/04 for regeneration or reactivation, e.g. of catalyst
• CPC Class Codes: F01N 2560/07 the means being an exhaust gas flow rate or velocity meter or sensor, intake flow meters only when exclusively used to determine exhaust gas parameters
• CPC Class Codes: F01N 2560/08 the means being a pressure sensor
• CPC Class Codes: F01N 9/002 of filter regeneration, e.g. detection of clogging
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for determining the charge state of a particle filter installed in the exhaust gas line of an internal combustion engine comprises the following steps: determining the exhaust gas volumetric flow in the flow direction of the exhaust gas downstream of the particle filter (2), detecting the pressure present in the exhaust gas line (1) in the direction of flow of the exhaust gas prior to the particle filter (2), comparing the exhaust gas volumetric flow determined hinter the particle filter (2) with the detected pressure present upstream of the particle filter (2) and evaluating the results of the comparison with consideration to the exhaust gas back pressure of the uncharged particle filter (2) and the exhaust gas back pressure caused by the particle filter charge, said pressure being higher than the uncharged filter. Further described is a corresponding device for reducing the particle emissions of an internal combustion engine.

Claims

1. A device for reducing the particle emissions of an internal combustion engine, in particular a diesel engine, comprising:

a particle filter installed in the exhaust gas line of the internal combustion engine;

a device for determining the soot charge state of the particle filter, the device for determining the charge state having a pressure sensor arranged in the exhaust gas line in a direction of flow of the exhaust gas upstream of the particle filter for detecting the prevailing pressure in the exhaust gas line and a volumetric flow sensor arranged downstream of the particle filter in the direction of the flow of the exhaust gas,

wherein the volumetric flow sensor comprises a measuring cone arranged in the exhaust gas line, a longitudinal axis of the measuring cone being parallel to a longitudinal axis of the exhaust gas line in this section;

the measuring cone arranged with a conical surface facing the direction of flow of the exhaust gas in the exhaust gas line, wherein one measuring point for measuring the dynamic pressure in the center of the cone is located opposite to the direction of flow of the exhaust gas, and one measuring point for measuring the static pressure is located in the no-flow zone of the measuring cone; and

wherein two sensors for evaluating measured results are connected to control a unit.

2. The device of claim 1, wherein the measuring points in both connected by means of a measuring channel with a pressure sensor arranged outside of the exhaust gas line.

3. The device of claim 2, wherein the measuring cone is held by a body forming the measuring channel(s) within the exhaust gas line.

4. The device of claim 3, wherein the measuring channels are arranged in a support body which holds the measuring cone in the exhaust gas line.

5. The device of claim 1, wherein the measuring cone further comprises an effective fluidic trailing edge on its largest diameter that determines the radial termination.