Inventor · disambiguated record
Vijay Ramappan
Also filed as: RAMAPPAN VIJAY · RAMAPPAN VIJAY A
58 granted patents·2 pending applications·231 citations·filing 2005–2023
98Inventor score
Files withGM GLOBAL TECH OPERATIONS LLC24GM GLOBAL TECH OPERATIONS INC13RAMAPPAN VIJAY11RAYL ALLEN B2SHIBATA JONATHAN T2
Top patents by PatentIndex Score
60 records- 0195US10352223B2Method for cold start emissions diagnosticGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Jul 16, 2019·11 cites·18 claims
- 0294US9157390B2Selective exhaust gas recirculation diagnostic systems and methodsSONG B JERRY·Filed 2011·Granted Oct 13, 2015·17 cites·10 claims
- 0391US11913401B1Engine emission control systems for deceleration fuel cutoff events and cold startsGM GLOBAL TECH OPERATIONS LLC·Filed 2023·Granted Feb 27, 2024·2 cites·20 claims
- 0491US11118491B1Gasoline particulate filter regeneration systems and methodsGM GLOBAL TECH OPERATIONS LLC·Filed 2020·Granted Sep 14, 2021·4 cites·20 claims
- 0590US10669922B2System and method for adjusting the rate of coolant flow through an engine based on coolant pressureGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Jun 2, 2020·4 cites·14 claims
- 0689US10808594B2Generalized cold start emissions reduction strategyGM GLOBAL TECH OPERATIONS LLC·Filed 2018·Granted Oct 20, 2020·13 cites·15 claims
- 0786US8463531B2System and method for controlling exhaust gas recirculation systemsRAMAPPAN VIJAY·Filed 2010·Granted Jun 11, 2013·10 cites·20 claims
- 0886US7765053B2Multi-injection combustion cycle systems for SIDI enginesGM GLOBAL TECH OPERATIONS INC·Filed 2008·Granted Jul 27, 2010·19 cites·20 claims
- 0984US8726880B2Electric cam phaser control systems and methodsSTEWART ETSUKO MURAJI·Filed 2011·Granted May 20, 2014·6 cites·20 claims
- 1084US8000882B2Active combustion control based on ringing index for reducing homogenous charge compression ignition (HCCI) combustion noiseGM GLOBAL TECH OPERATIONS INC·Filed 2008·Granted Aug 16, 2011·10 cites·19 claims
- 1183US8499738B2Control systems for a variable capacity engine oil pumpSTORCH KEVIN J·Filed 2010·Granted Aug 6, 2013·7 cites·20 claims
- 1283US7739027B2Method and apparatus for monitoring an EGR valve in an internal combustion engineGM GLOBAL TECH OPERATIONS INC·Filed 2008·Granted Jun 15, 2010·12 cites·18 claims
- 1382US7478625B1Engine cranking system with cylinder deactivation for a direct injection engineGM GLOBAL TECH OPERATIONS INC·Filed 2007·Granted Jan 20, 2009·12 cites·21 claims
- 1482US7415348B1Multiple injection blend for direct injected enginesGM GLOBAL TECH OPERATIONS INC·Filed 2007·Granted Aug 19, 2008·15 cites·22 claims
- 1579US10605151B2Electric pump operating strategyGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Granted Mar 31, 2020·2 cites·12 claims
- 1679US9840962B2System and method for controlling inlet coolant temperature of an internal combustion engineGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Dec 12, 2017·2 cites·20 claims
- 1779US9719406B2Engine out coolant temperature correctionGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Aug 1, 2017·2 cites·14 claims
- 1878US7975668B2Spark timing and control during transitions between spark ignited combustion and homogenous charge compression ignitionGM GLOBAL TECH OPERATIONS INC·Filed 2008·Granted Jul 12, 2011·12 cites·12 claims
- 1975US8316818B2HCCI mode switching control system and methodRAMAPPAN VIJAY·Filed 2009·Granted Nov 27, 2012·8 cites·20 claims
- 2072US8915236B2Systems and methods for controlling engine combustion stabilityRAMAPPAN VIJAY·Filed 2011·Granted Dec 23, 2014·4 cites·20 claims
- 2172US7131425B2Method to control auto-ignition in an internal combustion engine equipped with variable valve timing controlDELPHI TECH INC·Filed 2005·Granted Nov 7, 2006·9 cites·10 claims
- 2271US7729844B2HCCI combustion moding state control for fuel economy and seamless transitionsGM GLOBAL TECH OPERATIONS INC·Filed 2009·Granted Jun 1, 2010·8 cites·20 claims
- 2370US8118010B2Diagnostic systems and methods for fuel injectors in homogenous charge compression ignition engine systemsSHIBATA JONATHAN T·Filed 2009·Granted Feb 21, 2012·6 cites·20 claims
- 2469US8539932B2Systems and methods for heating intake air during cold HCCI operationRAMAPPAN VIJAY·Filed 2009·Granted Sep 24, 2013·6 cites·20 claims
- 2569US7963268B2Control strategy for transitions between homogeneous-charge compression-ignition and spark-ignition combustion modesGM GLOBAL TECH OPERATIONS INC·Filed 2009·Granted Jun 21, 2011·7 cites·18 claims
- 2666US9506420B2External EGR rate feedbackGM GLOBAL TECH OPERATIONS LLC·Filed 2013·Granted Nov 29, 2016·2 cites·12 claims
- 2765US10480391B2Coolant control systems and methods to prevent coolant boilingGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted Nov 19, 2019·2 cites·13 claims
- 2862US9863337B2Systems for regeneration of a gasoline particulate filterGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted Jan 9, 2018·2 cites·19 claims
- 2962US9540987B2System and method for diagnosing a fault in a partitioned coolant valveGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted Jan 10, 2017·1 cites·20 claims
- 3061US9719408B2System and method for engine block coolingGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted Aug 1, 2017·1 cites·19 claims
- 3161US8433500B2System and method for improved transitions between engine combustion modesRAMAPPAN VIJAY·Filed 2010·Granted Apr 30, 2013·1 cites·20 claims
- 3260US11098666B1System and method for controlling amount of sulfur on three-way catalyst by limiting deceleration cylinder cut offGM GLOBAL TECH OPERATIONS LLC·Filed 2020·Granted Aug 24, 2021·0 cites·20 claims
- 3359US11885253B1Control of engine enthalpy for catalytic converter light-offGM GLOBAL TECH OPERATIONS LLC·Filed 2022·Granted Jan 30, 2024·0 cites·20 claims
- 3458US8322324B2System and method for controlling transient switching between HCCI mode and SI mode of an engineRAMAPPAN VIJAY·Filed 2009·Granted Dec 4, 2012·3 cites·21 claims
- 3558US8276551B2HCCI combustion moding state control for fuel economy and seamless transitionsRAMAPPAN VIJAY·Filed 2008·Granted Oct 2, 2012·2 cites·20 claims
- 3657US11885250B1Vehicle systems and methods for aftertreatment preheatingGM GLOBAL TECH OPERATIONS LLC·Filed 2023·Granted Jan 30, 2024·0 cites·16 claims
- 3757US8290686B2Method for controlling combustion mode transitions for an internal combustion engineKANG JUN-MO·Filed 2009·Granted Oct 16, 2012·3 cites·20 claims
- 3856US8755987B2System and method for torque control in a homogeneous charge compression ignition engineRAMAPPAN VIJAY·Filed 2011·Granted Jun 17, 2014·1 cites·18 claims
- 3955US9957875B2Coolant pump control systems and methods for backpressure compensationGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted May 1, 2018·0 cites·20 claims
- 4054US11313291B2Secondary throttle control systems and methodsGM GLOBAL TECH OPERATIONS LLC·Filed 2020·Granted Apr 26, 2022·0 cites·20 claims
- 4153US10006335B2Coolant temperature correction systems and methodsGM GLOBAL TECH OPERATIONS LLC·Filed 2015·Granted Jun 26, 2018·0 cites·20 claims
- 4252US9599011B2Electric coolant pump diagnostic systems and methodsGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted Mar 21, 2017·0 cites·18 claims
- 4352US8776762B2HCCI mode switching control system and methodRAYL ALLEN B·Filed 2009·Granted Jul 15, 2014·2 cites·20 claims
- 4451US8381700B2Systems and methods for exhaust gas recirculation control in homogeneous charge compression ignition engine systemsGM GLOBAL TECH OPERATIONS INC·Filed 2009·Granted Feb 26, 2013·1 cites·20 claims
- 4550US8397490B2System and method for controlling a catalyst temperature in an HCCI combustion engineSHIBATA JONATHAN T·Filed 2009·Granted Mar 19, 2013·1 cites·19 claims
- 4650US8220436B2HCCI/SI combustion switching control system and methodRAYL ALLEN B·Filed 2009·Granted Jul 17, 2012·1 cites·19 claims
- 4749US9869223B2Flexible engine metal warming system and method for an internal combustion engineGM GLOBAL TECH OPERATIONS LLC·Filed 2014·Granted Jan 16, 2018·0 cites·15 claims
- 4849US9341133B2Exhaust gas recirculation control systems and methodsGM GLOBAL TECH OPERATIONS INC·Filed 2013·Granted May 17, 2016·0 cites·18 claims
- 4948US9932917B2Exhaust gas recirculation control systems and methodsRAMAPPAN VIJAY·Filed 2012·Granted Apr 3, 2018·0 cites·20 claims
- 5047US8086388B2Camshaft phasor synchronization system for an engineCINPINSKI KENNETH J·Filed 2008·Granted Dec 27, 2011·0 cites·20 claims
Showing the top 50 of 60 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →