EP 1959121 A1 20080820 - Sensor activation monitor
Title (en)
Sensor activation monitor
Title (de)
Monitor zur Sensorenaktivierung
Title (fr)
Surveillance de l'activation d'un capteur
Publication
Application
Priority
EP 07102404 A 20070214
Abstract (en)
The present invention relates to a method and on-board diagnostic system for verifying timely activation of a heated exhaust gas binary oxygen sensor arranged in an exhaust after-treatment system of a vehicle following start-up of an associated internal combustion engine. It is determined if entry conditions are met. Changes in an electrical signal output by the sensor are detected. A maximum value of the signal is detected. The detected signal changes are accumulated. It is determined if the accumulation is above a predetermined threshold within a first time period following start-up. It is determined if the maximum value is above a predetermined reference value within a second time period following start-up. If at least one of the determinations is positive, a functioning sensor is indicated and if both determinations are negative, a malfunctioning sensor is indicated.
IPC 8 full level
F02D 41/14 (2006.01)
CPC (source: EP)
F02D 41/1454 (2013.01); F02D 41/1474 (2013.01); F02D 41/1495 (2013.01)
Citation (applicant)
US 5801295 A 19980901 - DAVEY CHRISTOPHER KIRK [US], et al
Citation (search report)
- [A] US 4844038 A 19890704 - YAMATO AKIHIRO [JP], et al
- [A] US 2005016253 A1 20050127 - ANILOVICH IGOR [US], et al
- [A] DE 3840148 A1 19900531 - BOSCH GMBH ROBERT [DE]
- [A] EP 0624721 A1 19941117 - SIEMENS AG [DE]
- [A] DE 19729696 A1 19990211 - BOSCH GMBH ROBERT [DE]
- [A] US 5781878 A 19980714 - MIZOGUCHI TOMOMICHI [JP], et al
- [DA] US 5801295 A 19980901 - DAVEY CHRISTOPHER KIRK [US], et al
Designated contracting state (EPC)
DE GB SE
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 1959121 A1 20080820; EP 1959121 B1 20090819; CN 101245739 A 20080820; CN 101245739 B 20130508; DE 602007002050 D1 20091001
DOCDB simple family (application)
EP 07102404 A 20070214; CN 200810008232 A 20080214; DE 602007002050 T 20070214