Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensors system

Method and apparatus for determining deterioration of three-way catalysts in double air-fuel ratio sensors system

US Patent 5282383 · Granted Feb 1, 1994

Estimated economic value: $496,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Apparatus for detecting malfunction in evaporated fuel purge system2001
Apparatus for detecting malfunction in fuel evaporative prurge system1994
Device for determining misfiring cylinder of multicylinder engine1993
Failure detection device for evaporative fuel purge system1993
Apparatus for detecting malfunction in evaporated fuel purge system1993
Air-fuel ratio control device for an engine1993
Method and apparatus for detecting abnormal state of evaporative emission-contro1993
Apparatus for diagnosing abnormality in fuel injection system and fuel injection1993
Apparatus for determining deterioration of three-way catalyst of internal combus1992
Apparatus for detecting malfunction in evaporated fuel purge system1992
Apparatus and method for detecting abnormalities in a secondary air supplier1992
Double air-fuel ratio sensor system in internal combustion engine1992