by monitoring engine running conditions

Industry

CPC
F02M25/0827

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Parent Industries

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F02Combustion engines F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF F02M25/00Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel, or fuel-air mixture

Current Industry

F02M25/0827by monitoring engine running conditions

Industries

Patents Grantslast 30 patents

Information Patent Grant
Method and device for increasing purge rate of fuel evaporation gas...
- Patent number 11,754,006
- Issue date Sep 12, 2023
- Hyundai Motor Company
- Jung Seop Son
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Engine apparatus
- Patent number 11,746,717
- Issue date Sep 5, 2023
- Toyota Jidosha Kabushiki Kaisha
- Masanao Idogawa
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
System and method for determining a fuel vapor concentration in a c...
- Patent number 11,692,517
- Issue date Jul 4, 2023
- AVL Test Systems, Inc.
- Benjamin C. Shade
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Method and system for diagnosing an evaporative emissions system
- Patent number 11,686,276
- Issue date Jun 27, 2023
- Ford Global Technologies, LLC
- Aed Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Diagnostic for a fuel system
- Patent number 11,686,277
- Issue date Jun 27, 2023
- Ford Global Technologies, LLC
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Systems and methods for evaporative emission purge control in hybri...
- Patent number 11,661,898
- Issue date May 30, 2023
- GM Global Technology Operations LLC
- Yiran Hu
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Failure diagnosis method and system of dual purge system
- Patent number 11,649,788
- Issue date May 16, 2023
- Hyundai Motor Company
- Young-Sun Nam
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Method and system for determining vapor storage canister restriction
- Patent number 11,542,895
- Issue date Jan 3, 2023
- Ford Global Technologies, LLC
- Aed Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Evaporated fuel treatment apparatus
- Patent number 11,371,470
- Issue date Jun 28, 2022
- Aisan Kogyo Kabushiki Kaisha
- Daisaku Asanuma
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Evaporative emissions control system leak check module including fi...
- Patent number 11,225,934
- Issue date Jan 18, 2022
- Stoneridge, Inc.
- Robert J. Steinman
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Active dual purge system and method of diagnosing active dual purge...
- Patent number 11,187,193
- Issue date Nov 30, 2021
- Hyundai Motor Company
- Young-Kyu Oh
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Evaporated fuel processing device and control device
- Patent number 11,118,538
- Issue date Sep 14, 2021
- Aisan Kogyo Kabushiki Kaisha
- Makoto Nakagawa
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Method and system for calculating fuel injection amount of fuel vap...
- Patent number 11,047,319
- Issue date Jun 29, 2021
- Hyundai Motor Company
- Hyeon A Lee
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Method of diagnosing engine purge system
- Patent number 11,008,980
- Issue date May 18, 2021
- Hyundai Motor Company
- Bon Chang Koo
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Evaporated fuel processing device
- Patent number 10,968,869
- Issue date Apr 6, 2021
- Aisan Kogyo Kabushiki Kaisha
- Nobuhiro Kato
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Systems and methods for improving vehicle engine stability
- Patent number 10,961,937
- Issue date Mar 30, 2021
- Ford Global Technologies, LLC
- Aed Dudar
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Internal combustion engine and method for detecting a leak from a c...
- Patent number 10,907,591
- Issue date Feb 2, 2021
- Bayerische Motoren Werke Aktiengesellschaft
- Jessica Golladay
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Vaporized fuel treatment device and learning method of valve openin...
- Patent number 10,907,592
- Issue date Feb 2, 2021
- Aisan Kogyo Kabushiki Kaisha
- Yoshikazu Miyabe
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Methods and systems for cloud-based emissions testing
- Patent number 10,883,450
- Issue date Jan 5, 2021
- Ford Global Technologies, LLC
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
System and method for determining a fuel vapor concentration in a c...
- Patent number 10,865,743
- Issue date Dec 15, 2020
- AVL Test Systems, Inc.
- Benjamin C. Shade
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Grant
Systems and methods for preventing engine stall
- Patent number 10,823,118
- Issue date Nov 3, 2020
- Ford Global Technologies, LLC
- Aed Dudar
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Method for diagnosing leakage of fuel vapor purge system
- Patent number 10,815,938
- Issue date Oct 27, 2020
- Hyundai Motor Company
- Choo Saeng Choi
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Systems and methods for onboard canister purge valve flow mapping
- Patent number 10,767,599
- Issue date Sep 8, 2020
- Ford Global Technologies, LLC
- Aed Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Tank venting system for an internal combustion engine and method fo...
- Patent number 10,746,137
- Issue date Aug 18, 2020
- Volkswagen Aktiengesellschaft
- Jens Wodausch
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Fuel tank venting system for a motor vehicle
- Patent number 10,711,713
- Issue date Jul 14, 2020
- Daimler AG
- Udo Brinkaemper
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Systems and methods for improving vehicle engine stability
- Patent number 10,704,478
- Issue date Jul 7, 2020
- Ford Global Technologies, LLC
- Aed Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Canister purge system and method for diagnosing purge valve thereof
- Patent number 10,697,399
- Issue date Jun 30, 2020
- Hyundai Motor Company
- Choo Saeng Choi
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Abnormality detection device for engine system detecting an abnorma...
- Patent number 10,690,028
- Issue date Jun 23, 2020
- Denso Corporation
- Ryozo Kayama
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Systems and methods for intake system hydrocarbon trap diagnostics
- Patent number 10,605,181
- Issue date Mar 31, 2020
- Ford Global Technologies, LLC
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Diagnostic method for diagnosing sticking of canister purge valve a...
- Patent number 10,527,008
- Issue date Jan 7, 2020
- Hyundai Autron Co., Ltd.
- Dong-Ha Kim
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

Patents Applicationslast 30 patents

Information Patent Application
DIAGNOSTIC FOR A FUEL SYSTEM
- Publication number 20230014329
- Publication date Jan 19, 2023
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
FAILURE DIAGNOSIS METHOD AND SYSTEM OF DUAL PURGE SYSTEM
- Publication number 20220364531
- Publication date Nov 17, 2022
- Hyundai Motor Company
- Young-Sun Nam
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHOD AND SYSTEM FOR DETERMINING VAPOR STORAGE CANISTER RESTRICTION
- Publication number 20220364530
- Publication date Nov 17, 2022
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
ENGINE APPARATUS
- Publication number 20210388782
- Publication date Dec 16, 2021
- Toyota Jidosha Kabushiki Kaisha
- Masanao IDOGAWA
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
ACTIVE DUAL PURGE SYSTEM AND METHOD OF DIAGNOSING ACTIVE DUAL PURGE...
- Publication number 20210363943
- Publication date Nov 25, 2021
- Hyundai Motor Company
- Young-Kyu OH
- G07 - CHECKING-DEVICES
Information Patent Application
METHOD OF DIAGNOSING ENGINE PURGE SYSTEM
- Publication number 20210148310
- Publication date May 20, 2021
- Hyundai Motor Company
- Bon Chang KOO
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
System and Method for Determining a Fuel Vapor Concentration in a C...
- Publication number 20210102514
- Publication date Apr 8, 2021
- AVL TEST SYSTEMS, INC.
- Benjamin C. SHADE
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information Patent Application
SYSTEMS AND METHODS FOR PREVENTING ENGINE STALL
- Publication number 20200347804
- Publication date Nov 5, 2020
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed Dudar
- B60 - VEHICLES IN GENERAL
Information Patent Application
EVAPORATED FUEL PROCESSING DEVICE AND CONTROL DEVICE
- Publication number 20200141361
- Publication date May 7, 2020
- AISAN KOGYO KABUSHIKI KAISHA
- Makoto NAKAGAWA
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHODS AND SYSTEMS FOR CLOUD-BASED EMISSIONS TESTING
- Publication number 20200032746
- Publication date Jan 30, 2020
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- G01 - MEASURING TESTING
Information Patent Application
METHOD FOR DIAGNOSING LEAKAGE OF FUEL VAPOR PURGE SYSTEM
- Publication number 20200003164
- Publication date Jan 2, 2020
- Hyundai Motor Company
- Choo Saeng Choi
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
PURGE SYSTEM
- Publication number 20200003163
- Publication date Jan 2, 2020
- HELLA GmbH & Co. KGaA
- Ingo NIEMEYER
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
Evaporative Emissions Control System Leak Check Module Including Fi...
- Publication number 20190368447
- Publication date Dec 5, 2019
- Stoneridge, Inc.
- Robert J. Steinman
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SYSTEMS AND METHODS FOR ONBOARD CANISTER PURGE VALVE FLOW MAPPING
- Publication number 20190360434
- Publication date Nov 28, 2019
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SYSTEMS AND METHODS FOR A VEHICLE COLD-START EVAPORATIVE EMISSIONS...
- Publication number 20190331062
- Publication date Oct 31, 2019
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CANISTER PURGE SYSTEM AND METHOD FOR DIAGNOSING PURGE VALVE THEREOF
- Publication number 20190186423
- Publication date Jun 20, 2019
- Hyundai Motor Company
- Choo Saeng CHOI
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
System and Method for Determining a Fuel Vapor Concentration in a C...
- Publication number 20190145355
- Publication date May 16, 2019
- AVL TEST SYSTEMS, INC.
- Benjamin C. SHADE
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SYSTEMS AND METHODS FOR DIAGNOSING A VEHICLE FUEL SYSTEM AND EVAPOR...
- Publication number 20190040822
- Publication date Feb 7, 2019
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
FUEL VAPOR TREATMENT APPARATUS
- Publication number 20180274492
- Publication date Sep 27, 2018
- DENSO CORPORATION
- Kimio UCHIDA
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TANK VENTING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE AND METHOD FO...
- Publication number 20180216578
- Publication date Aug 2, 2018
- Volkswagen Aktiengesellschaft
- Jens Wodausch
- B60 - VEHICLES IN GENERAL
Information Patent Application
EVAPORATIVE EMISSIONS SYSTEM CHECK VALVE MONITOR FOR A MULTI-PATH P...
- Publication number 20180187614
- Publication date Jul 5, 2018
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
SYSTEMS AND METHODS FOR A VEHICLE COLD-START EVAPORATIVE EMISSIONS...
- Publication number 20170363046
- Publication date Dec 21, 2017
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
EVAPORATIVE EMISSIONS CONTROL SYSTEM INCLUDING A PURGE PUMP AND HYD...
- Publication number 20170342919
- Publication date Nov 30, 2017
- Joseph Dekar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
TECHNIQUES FOR MONITORING PURGE FLOW AND DETECTING VAPOR CANISTER L...
- Publication number 20170342946
- Publication date Nov 30, 2017
- Roger C. Sager
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHOD FOR DIAGNOSING THE OPERATION OF THE PURGING OF A CANISTER
- Publication number 20170335803
- Publication date Nov 23, 2017
- RENAULT S.A.S.
- David ISSARTEL
- G01 - MEASURING TESTING
Information Patent Application
FUEL VAPOR PURGING DIAGNOSTICS FOR A MULTI-PATH PURGE EJECTOR SYSTEM
- Publication number 20170314512
- Publication date Nov 2, 2017
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
Purge Valve Leak Diagnostic Robustness Improvements For Small Turbo...
- Publication number 20170218886
- Publication date Aug 3, 2017
- GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Robert W. JACKSON
- G01 - MEASURING TESTING
Information Patent Application
SYSTEM AND METHODS FOR CONTROLLING FUEL VAPOR CANISTER PURGE OPERAT...
- Publication number 20170211517
- Publication date Jul 27, 2017
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- Aed M. Dudar
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
EVAPORATED FUEL TREATMENT DEVICES
- Publication number 20170159616
- Publication date Jun 8, 2017
- AISAN KOGYO KABUSHIKI KAISHA
- Yoshikazu MIYABE
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHOD FOR AIR/FUEL IMBALANCE DETECTION
- Publication number 20170122227
- Publication date May 4, 2017
- FORD GLOBAL TECHNOLOGIES, L.L.C.
- John Eric Rollinger
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS

by monitoring engine running conditions

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Method and device for increasing purge rate of fuel evaporation gas...

Engine apparatus

System and method for determining a fuel vapor concentration in a c...

Method and system for diagnosing an evaporative emissions system

Diagnostic for a fuel system

Systems and methods for evaporative emission purge control in hybri...

Failure diagnosis method and system of dual purge system

Method and system for determining vapor storage canister restriction

Evaporated fuel treatment apparatus

Evaporative emissions control system leak check module including fi...

Active dual purge system and method of diagnosing active dual purge...

Evaporated fuel processing device and control device

Method and system for calculating fuel injection amount of fuel vap...

Method of diagnosing engine purge system

Evaporated fuel processing device

Systems and methods for improving vehicle engine stability

Internal combustion engine and method for detecting a leak from a c...

Vaporized fuel treatment device and learning method of valve openin...

Methods and systems for cloud-based emissions testing

System and method for determining a fuel vapor concentration in a c...

Systems and methods for preventing engine stall

Method for diagnosing leakage of fuel vapor purge system

Systems and methods for onboard canister purge valve flow mapping

Tank venting system for an internal combustion engine and method fo...

Fuel tank venting system for a motor vehicle

Systems and methods for improving vehicle engine stability

Canister purge system and method for diagnosing purge valve thereof

Abnormality detection device for engine system detecting an abnorma...

Systems and methods for intake system hydrocarbon trap diagnostics

Diagnostic method for diagnosing sticking of canister purge valve a...

Patents Applicationslast 30 patents

DIAGNOSTIC FOR A FUEL SYSTEM

FAILURE DIAGNOSIS METHOD AND SYSTEM OF DUAL PURGE SYSTEM

METHOD AND SYSTEM FOR DETERMINING VAPOR STORAGE CANISTER RESTRICTION

ENGINE APPARATUS

ACTIVE DUAL PURGE SYSTEM AND METHOD OF DIAGNOSING ACTIVE DUAL PURGE...

METHOD OF DIAGNOSING ENGINE PURGE SYSTEM

System and Method for Determining a Fuel Vapor Concentration in a C...

SYSTEMS AND METHODS FOR PREVENTING ENGINE STALL

EVAPORATED FUEL PROCESSING DEVICE AND CONTROL DEVICE

METHODS AND SYSTEMS FOR CLOUD-BASED EMISSIONS TESTING

METHOD FOR DIAGNOSING LEAKAGE OF FUEL VAPOR PURGE SYSTEM

PURGE SYSTEM

Evaporative Emissions Control System Leak Check Module Including Fi...

SYSTEMS AND METHODS FOR ONBOARD CANISTER PURGE VALVE FLOW MAPPING

SYSTEMS AND METHODS FOR A VEHICLE COLD-START EVAPORATIVE EMISSIONS...

CANISTER PURGE SYSTEM AND METHOD FOR DIAGNOSING PURGE VALVE THEREOF

System and Method for Determining a Fuel Vapor Concentration in a C...

SYSTEMS AND METHODS FOR DIAGNOSING A VEHICLE FUEL SYSTEM AND EVAPOR...

FUEL VAPOR TREATMENT APPARATUS

TANK VENTING SYSTEM FOR AN INTERNAL COMBUSTION ENGINE AND METHOD FO...

EVAPORATIVE EMISSIONS SYSTEM CHECK VALVE MONITOR FOR A MULTI-PATH P...

SYSTEMS AND METHODS FOR A VEHICLE COLD-START EVAPORATIVE EMISSIONS...

EVAPORATIVE EMISSIONS CONTROL SYSTEM INCLUDING A PURGE PUMP AND HYD...

TECHNIQUES FOR MONITORING PURGE FLOW AND DETECTING VAPOR CANISTER L...

METHOD FOR DIAGNOSING THE OPERATION OF THE PURGING OF A CANISTER

FUEL VAPOR PURGING DIAGNOSTICS FOR A MULTI-PATH PURGE EJECTOR SYSTEM

Purge Valve Leak Diagnostic Robustness Improvements For Small Turbo...

SYSTEM AND METHODS FOR CONTROLLING FUEL VAPOR CANISTER PURGE OPERAT...

EVAPORATED FUEL TREATMENT DEVICES

METHOD FOR AIR/FUEL IMBALANCE DETECTION