Title:
METHOD FOR DIAGNOSING AN EXHAUST GAS CATALYTIC CONVERTER, AND MOTOR VEHICLE
Document Type and Number:
WIPO Patent Application WO/2015/110247
Kind Code:
A3
Abstract:
The invention relates to a method and to a motor vehicle for diagnosing an exhaust gas catalytic converter (28), which is arranged in an exhaust gas tract (20) of an internal combustion engine (12) and is suitable for converting at least one exhaust gas component, wherein the exhaust gas tract (20) has an exhaust gas sensor (48) arranged upstream of the exhaust gas catalytic converter (28) and has an exhaust gas recirculation system (38), which is designed to remove at least part of the exhaust gas from an exhaust gas duct (24) of the exhaust gas tract (20) downstream of the exhaust gas catalytic converter (28) and to feed the removed exhaust gas to the internal combustion engine (12). The method comprises the following steps: measuring a first concentration (NOX1) of the exhaust gas component upstream of the exhaust gas catalytic converter (28) by means of the exhaust gas sensor (48) during fueled operation of the internal combustion engine (12), recirculating at least part of the exhaust gas by means of the exhaust gas recirculation system (38) during unfueled overrun of the internal combustion engine (12), measuring a second concentration (NOX2) of the exhaust gas component by means of the exhaust gas sensor (48) during the unfueled overrun of the internal combustion engine (12), and determining a state of the exhaust gas catalytic converter (28) in dependence on the first and second concentrations (NOX1, NOX2) of the exhaust gas component.
Inventors:
VELDTEN BURKHARD (DE)
KULASZEWSKI MACIEJ (DE)
KULASZEWSKI MACIEJ (DE)
Application Number:
PCT/EP2014/079390
Publication Date:
September 17, 2015
Filing Date:
December 29, 2014
Export Citation:
Assignee:
VOLKSWAGEN AG (DE)
International Classes:
F02D41/12; F01N11/00; F02D41/00; F02D41/14; F02D41/22
Domestic Patent References:
| WO2004046528A1 | 2004-06-03 | |||
| WO2013139848A1 | 2013-09-26 | |||
| WO2014095215A1 | 2014-06-26 |
Attorney, Agent or Firm:
GULDE & PARTNER PATENT- UND RECHTSANWALTSKANZLEI MBB (Berlin, DE)
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