Method and system of testing the proper functioning of a catalyzed particulate filter of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016356673-A1
Application number	US-201615172510-A
Country	US
Kind code	A1
Filing date	Jun 3, 2016
Priority date	Jun 3, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

A method of testing the proper functioning of a catalyzed particulate filter of an internal combustion engine during regeneration of the catalyzed particulate filter is disclosed. A first value of an oxygen concentration in an exhaust gas upstream of the catalyzed particulate filter and a second value of an oxygen concentration in the exhaust gas downstream of the catalyzed particulate filter is measured during regeneration. The difference between the first value and the second value is calculated and a malfunctioning of the catalyzed particulate filter is indicated when the calculated difference is below a predetermined threshold value thereof.

First claim

1 - 14 . (canceled)

15 . A method of function testing a catalyzed particulate filter of an internal combustion engine, comprising:
regenerating the catalyzed particulate filter; measuring a first value of an oxygen concentration in an exhaust gas upstream of the catalyzed particulate filter during the regeneration; measuring a second value of an oxygen concentration in the exhaust gas downstream of the catalyzed particulate filter during the regeneration; and identifying a malfunctioning of the catalyzed particulate filter when a difference between the first value and the second value is less than a first, predetermined threshold value.

16 . The method according to claim 15 , further comprising:
determining an amount of particulate trapped in the catalyzed particulate filter, during the regeneration; and measuring the first and second values when the determined amount is less than a second, predetermined threshold value thereof.

17 . The method according to claim 15 , further comprising integrating the difference over the predetermined period of time.

18 . The method according to claim 15 , further comprising generating a signal perceivable by a driver when the malfunctioning is identified.

19 . The method according to claim 15 , wherein the first, predetermined threshold value is determined on the basis of a volumetric flow rate of the exhaust gas.

20 . The method according to claim 15 , wherein the first, predetermined threshold value is determined on the basis of engine speed and engine torque.

21 . A system for function testing a catalyzed particulate filter in an aftertreatment system of an internal combustion engine, comprising:
a first oxygen sensor upstream of the catalyzed particulate filter; a second oxygen sensor downstream of the catalyzed particulate filter; and wherein an electronic control unit configured to:
perform a regeneration of the catalyzed particulate filter;
receive a first signal from the first oxygen sensor to measure a first value of an oxygen concentration in an exhaust gas upstream of the catalyzed particulate filter during the regeneration;
receive a second signal from the second oxygen sensor to measure and a second value of an oxygen concentration in the exhaust gas downstream of the catalyzed particulate filter during the regeneration; and
identify a malfunctioning of the catalyzed particulate filter when a calculated difference between the first value and the second value is less than a first, predetermined threshold value thereof.

22 . The system according to claim 21 , wherein the first oxygen sensor comprises a lambda sensor.

23 . The system according to claim 21 , wherein the first oxygen sensor comprises a nitrogen oxide sensor.

24 . The system according to claim 21 , wherein the second oxygen sensor comprises a lambda sensor.

25 . The system according to claim 21 , wherein the second oxygen sensor comprises a nitrogen oxide sensor.

26 . The system according to claim 21 , wherein the electronic control unit is configured to:
determine an amount of particulate trapped in the catalyzed particulate filter, during the regeneration; and measure the first and second values when the determined amount s less than a second, predetermined threshold value thereof.

27 . The system according to any of the preceding claims 21 , wherein the electronic control unit is configured to integrate the calculated difference over the predetermined period of time.

28 . The system according to any of the preceding claims 21 , further comprising an indicator perceivable by a driver, wherein the electronic control unit is configured to activate the indicator when the malfunctioning is identified.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Taibi Cristian
• Siano Francesco

Classifications

• F01N11/002 Primary

  the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus · CPC title

• G01N2015/0046

  in gas, e.g. smoke · CPC title

• G01N15/0656

  using electric, e.g. electrostatic methods or magnetic methods (by investigating individual particles G01N15/1031, G01N15/12) · CPC title

• G01M15/104 Primary

  using oxygen or lambda-sensors (testing catalytic converters F01N3/18, F01N11/007) · CPC title

• F02D2200/101

  Engine speed · CPC title