| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_152ca493031abf008dea905dc49310e2 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02D2041-1409
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02T10-40
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02A50-20
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02D2041-1418
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02B2075-027
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F01N2550-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02D2041-1416 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02D41-2458
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02D41-1401
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F02D41-1441
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/F01N11-007 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F02B75-02 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F01N3-20
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F01N11-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/F02D41-14 |
| filingDate |
1993-08-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1995-10-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f1215dea78248809f57a8f63047c43dc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5863f96454669242fd4e60f5383ac6e5 |
| publicationDate |
1995-10-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
CA-2104573-C |
| titleOfInvention |
On-board catalytic converter efficiency monitoring |
| abstract |
Apparatus, method and system are provided for monitoring catalytic converter efficiency in treating exhaust gas from an internal combustion engine. The air/fuel ratio fed to the engine is perturbed on a cylinder-to-cylinder basis above and below a mean or average air/fuel ratio. The signal from an exhaust gas exposed to the exhaust gas sensor downstream of the converter for the perturbation interval is compared to the signal for a non-perturbation interval. A signal is generated when the comparison indicates catalytic converter efficiency below a minimum acceptable level. The comparison may be carried out by comparing the difference in the mean value of the EGO sensor output signal for the perturbation and non-perturbation intervals to a preselected and stored reference value corresponding to the minimum acceptable efficiency. The efficiency monitoring test system may be incorporated into fuel control means for controlling air/fuel ratio during normal engine operation. |
| priorityDate |
1992-08-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |