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F01L2800/12

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FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F01Engines F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES F01L2800/00Methods of operation using a variable valve timing mechanism

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F01L2800/12Fail safe operation

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Patents Grantslast 30 patents

Information Patent Grant
Method for verifying CVVD location learning result and CVVD system...
- Patent number 11,753,971
- Issue date Sep 12, 2023
- Hyundai Motor Company
- Bon-Chang Koo
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Valve actuation system comprising lost motion and high lift transfe...
- Patent number 11,619,180
- Issue date Apr 4, 2023
- Jacobs Vehicle Systems, Inc.
- Gabriel S. Roberts
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Compliant coupling for electrically-controlled variable camshaft ti...
- Patent number 11,560,815
- Issue date Jan 24, 2023
- BorgWarner Inc.
- Chad M. McCloy
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Cylinder deactivation energy waste management
- Patent number 11,459,917
- Issue date Oct 4, 2022
- EATON INTELLIGENT POWER LIMITED
- James E McCarthy
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Torque limited variable camshaft timing assembly
- Patent number 11,454,141
- Issue date Sep 27, 2022
- BorgWarner Inc.
- Shawn Blackmur
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Torque-limiting rotor coupling for an electrically-actuated camshaf...
- Patent number 11,454,140
- Issue date Sep 27, 2022
- BorgWarner Inc.
- Chad M. McCloy
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Method for verifying CVVD location learning result and CVVD system...
- Patent number 11,391,188
- Issue date Jul 19, 2022
- Hyundai Motor Company
- Bon-Chang Koo
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Actuation arrangement for actuating a latch in a switchable rocker...
- Patent number 11,359,523
- Issue date Jun 14, 2022
- EATON INTELLIGENT POWER LIMITED
- Alessio Lorenzon
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Monitoring deviations occurring in the valve drive of an internal c...
- Patent number 11,143,126
- Issue date Oct 12, 2021
- VITESCO TECHNOLOGIES GMBH
- Tobias Braun
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Method of continuously variable valve duration position learning ba...
- Patent number 11,085,339
- Issue date Aug 10, 2021
- Hyundai Motor Company
- Jung-Sup Byun
- G06 - COMPUTING CALCULATING COUNTING
Information Patent Grant
Mechanical retention member for valvetrain components
- Patent number 11,028,737
- Issue date Jun 8, 2021
- Cummins Inc.
- Gregory J. Mitchum
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Method for alternate control of CVVD malfunction and CVVD system th...
- Patent number 10,890,125
- Issue date Jan 12, 2021
- Hyundai Motor Company
- Min-Kyu Won
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Hydraulic early engine exhaust valve opening system
- Patent number 10,641,140
- Issue date May 5, 2020
- Caterpillar Inc.
- Craig Phillip Hittle
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Cylinder deactivation hydraulic lash adjuster
- Patent number 10,619,525
- Issue date Apr 14, 2020
- EATON INTELLIGENT POWER LIMITED
- James E McCarthy
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Control device and control method for internal combustion engine
- Patent number 10,316,765
- Issue date Jun 11, 2019
- Toyota Jidosha Kabushiki Kaisha
- Mitsuhiro Nomura
- Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
Information Patent Grant
Valve opening and closing timing control apparatus
- Patent number 10,196,945
- Issue date Feb 5, 2019
- Aisin Seiki Kabushiki Kaisha
- Masaaki Kaneko
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Method of controlling continuously variable valve timing system for...
- Patent number 10,174,684
- Issue date Jan 8, 2019
- Hyundai Motor Company
- Sung Joo Kim
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Camshaft phaser using one-way slipper clutches
- Patent number 10,060,303
- Issue date Aug 28, 2018
- Schaeffler Technologies AG & Co. KG
- Eric Berndt
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Control device for internal combustion engine
- Patent number 10,030,596
- Issue date Jul 24, 2018
- Toyota Jidosha Kabushiki Kaisha
- Hiroyuki Sugihara
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
System for controlling valve opening/closing timing
- Patent number 10,006,320
- Issue date Jun 26, 2018
- Aisin Seiki Kabushiki Kaisha
- Hiroyuki Amano
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Variable valve lift diagnostic systems and methods using cam phaser...
- Patent number 9,810,161
- Issue date Nov 7, 2017
- GM Global Technology Operations LLC
- Victor A. Fiorini
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Control device and control method for internal combustion engine
- Patent number 9,708,997
- Issue date Jul 18, 2017
- Hitachi Automotive Systems, Ltd.
- Kentaro Mikawa
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Variable valve timing control apparatus
- Patent number 9,488,112
- Issue date Nov 8, 2016
- Denso Corporation
- Takayoshi Nakamura
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Valve timing adjusting system
- Patent number 9,169,746
- Issue date Oct 27, 2015
- Denso Corporation
- Masashi Hayashi
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Apparatus and method for controlling variable valve mechanism
- Patent number 9,109,472
- Issue date Aug 18, 2015
- Hitachi Automotive Systems, Ltd.
- Norihiro Araya
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Mechanically controllable valve-train assembly
- Patent number 9,074,495
- Issue date Jul 7, 2015
- Kolbenschmidt Pierburg Innovations GmbH
- Rudolf Flierl
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Controller for internal combustion engine
- Patent number 8,935,076
- Issue date Jan 13, 2015
- Toyota Jidosha Kabushiki Kaisha
- Koji Ide
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Grant
Camshaft adjuster with device for emergency operation
- Patent number 8,757,115
- Issue date Jun 24, 2014
- MAGNA Powertrain & AG & Co. KG
- Michael Schober
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Adjusting system for camshafts of an internal combustion engine
- Patent number 8,651,076
- Issue date Feb 18, 2014
- ZF Friedrichshafen AG
- Jochen Walliser
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Valve timing adjuster
- Patent number 8,631,773
- Issue date Jan 21, 2014
- Denso Corporation
- Takashi Yamaguchi
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

Patents Applicationslast 30 patents

Information Patent Application
VALVE TIMING CONTROLLER
- Publication number 20210317762
- Publication date Oct 14, 2021
- AISIN SEIKI KABUSHIKI KAISHA
- ATSUSHI YAMAMOTO
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
ACTUATION ARRANGEMENT FOR ACTUATING A LATCH IN A SWITCHABLE ROCKER...
- Publication number 20210189917
- Publication date Jun 24, 2021
- Eaton Intelligent Power Limited
- Alessio LORENZON
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
MECHANICAL RETENTION MEMBER FOR VALVETRAIN COMPONENTS
- Publication number 20200355094
- Publication date Nov 12, 2020
- Cummins Inc.
- Gregory J. Mitchum
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
METHOD FOR ALTERNATE CONTROL OF CVVD MALFUNCTION AND CVVD SYSTEM TH...
- Publication number 20200173380
- Publication date Jun 4, 2020
- Hyundai Motor Company
- Min-Kyu WON
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
METHOD OF CONTINUOUSLY VARIABLE VALVE DURATION POSITION LEARNING BA...
- Publication number 20200072132
- Publication date Mar 5, 2020
- Hyundai Motor Company
- Jung-Sup Byun
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHOD FOR VERIFYING CVVD LOCATION LEARNING RESULT AND CVVD SYSTEM...
- Publication number 20200072097
- Publication date Mar 5, 2020
- Hyundai Motor Company
- Bon-Chang KOO
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
METHOD OF CONTROLLING CONTINUOUSLY VARIABLE VALVE TIMING SYSTEM FOR...
- Publication number 20170167410
- Publication date Jun 15, 2017
- Hyundai Motor Company
- Sung Joo KIM
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
CAMSHAFT PHASER USING ONE-WAY SLIPPER CLUTCHES
- Publication number 20170037749
- Publication date Feb 9, 2017
- SCHAEFFLER TECHNOLOGIES AG & CO. KG
- Eric Berndt
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CONTROL DEVICE AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE
- Publication number 20160348603
- Publication date Dec 1, 2016
- Hitachi Automotive Systems, Ltd.
- Kentaro MIKAWA
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
VALVE TIMING ADJUSTING SYSTEM
- Publication number 20140144399
- Publication date May 29, 2014
- DENSO CORPORATION
- Masashi HAYASHI
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
MECHANICALLY CONTROLLABLE VALVE-TRAIN ASSEMBLY
- Publication number 20130306010
- Publication date Nov 21, 2013
- KOLBENSCHMIDT PIERBURG INNOVATIONS GMBH
- Rudolf Flierl
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE
- Publication number 20130152887
- Publication date Jun 20, 2013
- Toyota Jidosha Kabushiki Kaisha
- Yoshiaki Miyazato
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
Information Patent Application
VALVE TRAIN OF A COMBUSTION PISTON ENGINE
- Publication number 20130146007
- Publication date Jun 13, 2013
- ZF Friedrichshafen AG
- Frank Richter
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE IN TH...
- Publication number 20130092114
- Publication date Apr 18, 2013
- Elmar Pietsch
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
APPARATUS AND METHOD FOR CONTROLLING VARIABLE VALVE MECHANISM
- Publication number 20130068181
- Publication date Mar 21, 2013
- HITACHI AUTOMOTIVE SYSTEMS, LTD.
- Norihiro ARAYA
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CAMSHAFT ADJUSTER WITH DEVICE FOR EMERGENCY OPERATION
- Publication number 20120279466
- Publication date Nov 8, 2012
- Magna Powertrain AG & Co KG
- Michael SCHOBER
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
VARIABLE VALVE TIMING CONTROL APPARATUS
- Publication number 20120055429
- Publication date Mar 8, 2012
- DENSO CORPORATION
- Takayoshi Nakamura
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CONTROLLER FOR INTERNAL COMBUSTION ENGINE
- Publication number 20120016565
- Publication date Jan 19, 2012
- FUJITSU TEN LIMITED
- Koji Ide
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
ELECTROHYDRAULIC VALVE CONTROLLER
- Publication number 20110277712
- Publication date Nov 17, 2011
- Schaeffler Technologies GmbH & Co. KG
- Michael Haas
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
VALVE STOPPING DEVICE FOR INTERNAL COMBUSTION ENGINE
- Publication number 20110277710
- Publication date Nov 17, 2011
- Toyota Jidosha Kabushiki Kaisha
- Yoshihiro Sakayanagi
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
ADJUSTING SYSTEM FOR CAMSHAFTS OF AN INTERNAL COMBUSTION ENGINE
- Publication number 20110253086
- Publication date Oct 20, 2011
- Jochen Walliser
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
VALVE DRIVE OF AN INTERNAL COMBUSTION ENGINE
- Publication number 20110247577
- Publication date Oct 13, 2011
- Schaeffler Technologies GmbH & Co. KG
- Harald Elendt
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CONTROL UNIT FOR ONE OR MORE ELECTROMAGNETIC ACTUATORS OF A HEAT EN...
- Publication number 20110178696
- Publication date Jul 21, 2011
- Valeo Systemes de Controle Moteur
- Nicolas Gelez
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
Auxiliary electric oil booster pump apparatus for a motorcycle
- Publication number 20110174250
- Publication date Jul 21, 2011
- Richard Andrew Borde
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
METHOD OF DETERMINING OPENING OF AN INTERNAL COMBUSTION ENGINE INTA...
- Publication number 20110167900
- Publication date Jul 14, 2011
- MAGNETI MARELLI S.P.A.
- Massimo Zanotti
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
VALVE TIMING ADJUSTER
- Publication number 20110088645
- Publication date Apr 21, 2011
- DENSO CORPORATION
- Takashi YAMAGUCHI
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
CONTROL DEVICE FOR AN ENGINE
- Publication number 20110071748
- Publication date Mar 24, 2011
- Toyota Jidosha Kabushiki Kaisha
- Takahiro Nishigaki
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
DIAGNOSTIC SYSTEMS AND METHODS FOR A TWO-STEP VALVE LIFT MECHANISM
- Publication number 20110056448
- Publication date Mar 10, 2011
- GM Global Technology Operations, Inc.
- Kenneth J. Cinpinski
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
VARIABLE VALVE TIMING CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE
- Publication number 20110023805
- Publication date Feb 3, 2011
- DENSO CORPORATION
- Yuichi Takemura
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Application
TWO-STEP OIL CONTROL VALVE DIAGNOSTIC FROM PHASER OIL PRESSURE
- Publication number 20100281966
- Publication date Nov 11, 2010
- GM Global Technology Operations, Inc.
- Kenneth J. Cinpinski
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES

Fail safe operation

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Method for verifying CVVD location learning result and CVVD system...

Valve actuation system comprising lost motion and high lift transfe...

Compliant coupling for electrically-controlled variable camshaft ti...

Cylinder deactivation energy waste management

Torque limited variable camshaft timing assembly

Torque-limiting rotor coupling for an electrically-actuated camshaf...

Method for verifying CVVD location learning result and CVVD system...

Actuation arrangement for actuating a latch in a switchable rocker...

Monitoring deviations occurring in the valve drive of an internal c...

Method of continuously variable valve duration position learning ba...

Mechanical retention member for valvetrain components

Method for alternate control of CVVD malfunction and CVVD system th...

Hydraulic early engine exhaust valve opening system

Cylinder deactivation hydraulic lash adjuster

Control device and control method for internal combustion engine

Valve opening and closing timing control apparatus

Method of controlling continuously variable valve timing system for...

Camshaft phaser using one-way slipper clutches

Control device for internal combustion engine

System for controlling valve opening/closing timing

Variable valve lift diagnostic systems and methods using cam phaser...

Control device and control method for internal combustion engine

Variable valve timing control apparatus

Valve timing adjusting system

Apparatus and method for controlling variable valve mechanism

Mechanically controllable valve-train assembly

Controller for internal combustion engine

Camshaft adjuster with device for emergency operation

Adjusting system for camshafts of an internal combustion engine

Valve timing adjuster

Patents Applicationslast 30 patents

VALVE TIMING CONTROLLER

ACTUATION ARRANGEMENT FOR ACTUATING A LATCH IN A SWITCHABLE ROCKER...

MECHANICAL RETENTION MEMBER FOR VALVETRAIN COMPONENTS

METHOD FOR ALTERNATE CONTROL OF CVVD MALFUNCTION AND CVVD SYSTEM TH...

METHOD OF CONTINUOUSLY VARIABLE VALVE DURATION POSITION LEARNING BA...

METHOD FOR VERIFYING CVVD LOCATION LEARNING RESULT AND CVVD SYSTEM...

METHOD OF CONTROLLING CONTINUOUSLY VARIABLE VALVE TIMING SYSTEM FOR...

CAMSHAFT PHASER USING ONE-WAY SLIPPER CLUTCHES

CONTROL DEVICE AND CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

VALVE TIMING ADJUSTING SYSTEM

MECHANICALLY CONTROLLABLE VALVE-TRAIN ASSEMBLY

CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE

VALVE TRAIN OF A COMBUSTION PISTON ENGINE

METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE IN TH...

APPARATUS AND METHOD FOR CONTROLLING VARIABLE VALVE MECHANISM

CAMSHAFT ADJUSTER WITH DEVICE FOR EMERGENCY OPERATION

VARIABLE VALVE TIMING CONTROL APPARATUS

CONTROLLER FOR INTERNAL COMBUSTION ENGINE

ELECTROHYDRAULIC VALVE CONTROLLER

VALVE STOPPING DEVICE FOR INTERNAL COMBUSTION ENGINE

ADJUSTING SYSTEM FOR CAMSHAFTS OF AN INTERNAL COMBUSTION ENGINE

VALVE DRIVE OF AN INTERNAL COMBUSTION ENGINE

CONTROL UNIT FOR ONE OR MORE ELECTROMAGNETIC ACTUATORS OF A HEAT EN...

Auxiliary electric oil booster pump apparatus for a motorcycle

METHOD OF DETERMINING OPENING OF AN INTERNAL COMBUSTION ENGINE INTA...

VALVE TIMING ADJUSTER

CONTROL DEVICE FOR AN ENGINE

DIAGNOSTIC SYSTEMS AND METHODS FOR A TWO-STEP VALVE LIFT MECHANISM

VARIABLE VALVE TIMING CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE

TWO-STEP OIL CONTROL VALVE DIAGNOSTIC FROM PHASER OIL PRESSURE