Inventor · disambiguated record
Stephen Paul Levijoki
Also filed as: LEVIJOKI STEPHEN · LEVIJOKI STEPHEN P · LEVIJOKI STEPHEN PAUL
34 granted patents·2 pending applications·207 citations·filing 2007–2017
97Inventor score
Files withLEVIJOKI STEPHEN PAUL12GM GLOBAL TECH OPERATIONS LLC10GM GLOBAL TECH OPERATIONS INC5WANG YUE-YUN3KOWALKOWSKI JANEAN E2
Top patents by PatentIndex Score
36 records- 0196US10152834B1Combustion engine airflow management systems and methodsGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Dec 11, 2018·16 cites·19 claims
- 0294US10167746B2Method of controlling camshaft phase based on humidityGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Jan 1, 2019·5 cites·16 claims
- 0394US9297843B2Fault diagnostic systems and methods using oxygen sensor impedanceGM GLOBAL TECH OPERATIONS INC·Filed 2013·Granted Mar 29, 2016·15 cites·16 claims
- 0494US8910466B2Exhaust aftertreatment system with diagnostic delayKOWALKOWSKI JANEAN E·Filed 2012·Granted Dec 16, 2014·14 cites·14 claims
- 0593US9453472B2System and method for diagnosing a fault in an oxygen sensor based on ambient temperatureGM GLOBAL TECH OPERATIONS LLC·Filed 2013·Granted Sep 27, 2016·11 cites·20 claims
- 0692US9133750B2Method and system for verifying the operation of an SCR catalystLEVIJOKI STEPHEN PAUL·Filed 2010·Granted Sep 15, 2015·15 cites·20 claims
- 0792US8776503B2Method and apparatus for monitoring a reductant injection system in an exhaust aftertreatment systemWANG YUE-YUN·Filed 2010·Granted Jul 15, 2014·11 cites·8 claims
- 0891US10273900B2Method to determine reference airflow actuator positions for a gasoline engineGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Apr 30, 2019·5 cites·18 claims
- 0990US8869607B2Exhaust diagnostic system and method with SCR NH3 depletion cleansing mode for initial step in the def quality service healing testLEVIJOKI STEPHEN PAUL·Filed 2012·Granted Oct 28, 2014·15 cites·20 claims
- 1089US9057338B2Exhaust gas oxygen sensor fault detection systems and methods using fuel vapor purge rateGM GLOBAL TECH OPERATIONS INC·Filed 2012·Granted Jun 16, 2015·11 cites·20 claims
- 1188US8495862B2System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systemsLEVIJOKI STEPHEN PAUL·Filed 2010·Granted Jul 30, 2013·9 cites·20 claims
- 1285US10151251B1Method and controller for engine torque control in a vehicle during a default throttle conditionGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Dec 11, 2018·4 cites·16 claims
- 1385US9932909B1Method of engine cam control for cabin heatingGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Apr 3, 2018·3 cites·19 claims
- 1485US9657630B2Diagnostic systems and methods for selective catalytic reduction (SCR) systems based on NOx sensor feedbackPERRIN JAMES M·Filed 2009·Granted May 23, 2017·12 cites·13 claims
- 1584US8813693B2Diagnostic system and method for a switchable water pumpBIALAS DANIEL A·Filed 2011·Granted Aug 26, 2014·7 cites·20 claims
- 1683US8353202B2Exhaust diagnostic systems and methods with SCR conversion efficiency monitor disablingGM GLOBAL TECH OPERATIONS INC·Filed 2010·Granted Jan 15, 2013·6 cites·19 claims
- 1782US9086026B2System and method for controlling torque output of an engine when a water pump coupled to the engine is switched on or offGM GLOBAL TECH OPERATIONS INC·Filed 2012·Granted Jul 21, 2015·5 cites·20 claims
- 1878US10001073B2Systems and methods for multiple catalyst light off events during drive cycleGM GLOBAL TECH OPERATIONS LLC·Filed 2016·Granted Jun 19, 2018·4 cites·16 claims
- 1978US9234447B2System and method for determining selective catalytic reduction dosing system performance using an ammonia sensorLEVIJOKI STEPHEN PAUL·Filed 2010·Granted Jan 12, 2016·4 cites·7 claims
- 2078US9228482B2System and method for diagnosing a fault in a switchable water pump for an engine based on a change in crankshaft speedLEVIJOKI STEPHEN PAUL·Filed 2012·Granted Jan 5, 2016·2 cites·22 claims
- 2175US8915062B2Method and apparatus for monitoring a reductant injection system in an exhaust aftertreatment systemWANG YUE-YUN·Filed 2009·Granted Dec 23, 2014·6 cites·7 claims
- 2274US8869513B2Exhaust diagnostic control system and method with NH3 depletion cleansingLEVIJOKI STEPHEN PAUL·Filed 2012·Granted Oct 28, 2014·3 cites·20 claims
- 2374US8844267B2Method and system for controlling a nitrogen oxide (NOx) conversion efficiency monitorLEVIJOKI STEPHEN PAUL·Filed 2011·Granted Sep 30, 2014·5 cites·14 claims
- 2471US8286419B2Exhaust diagnostic systems and methods for resetting after operation with poor reductant qualityLEVIJOKI STEPHEN PAUL·Filed 2009·Granted Oct 16, 2012·9 cites·18 claims
- 2567US8629781B2Efficiency determination for a selective-catalytic-reduction catalystKOWALKOWSKI JANEAN E·Filed 2011·Granted Jan 14, 2014·3 cites·20 claims
- 2666US10190481B2Minimum power consumption for cool down diagnostic based on cylinder deactivationGM GLOBAL TECH OPERATIONS LLC·Filed 2013·Granted Jan 29, 2019·2 cites·18 claims
- 2761US9146177B2System and method for diagnosing a fault in an oxygen sensor based on engine speedGM GLOBAL TECH OPERATIONS INC·Filed 2012·Granted Sep 29, 2015·1 cites·20 claims
- 2859US8939010B2System and method for diagnosing faults in an oxygen sensorLEVIJOKI STEPHEN PAUL·Filed 2011·Granted Jan 27, 2015·1 cites·20 claims
- 2957US10436140B2Method of cam phase control based on cylinder wall temperatureGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted Oct 8, 2019·0 cites·11 claims
- 3056US9103267B2Low coolant temperature fault diagnostic systems and methodsLEVIJOKI STEPHEN PAUL·Filed 2012·Granted Aug 11, 2015·1 cites·18 claims
- 3153US8205440B2Intrusive SCR efficency testing systems and methods for vehicles with low temperature exhaust gasLEVIJOKI STEPHEN PAUL·Filed 2009·Granted Jun 26, 2012·2 cites·16 claims
- 3249US10287994B2Electronic throttle control using model predictive controlGM GLOBAL TECH OPERATIONS LLC·Filed 2017·Granted May 14, 2019·0 cites·16 claims
- 3345US9181844B2Diagnostic system and method for an oxygen sensor positioned downstream from a catalytic converterLEVIJOKI STEPHEN PAUL·Filed 2011·Granted Nov 10, 2015·0 cites·27 claims
- 3443US9096210B2Coordination of fuel cutoff for fault detection and hybrid operationWHITNEY CHRISTOPHER E·Filed 2012·Granted Aug 4, 2015·0 cites·20 claims
- 3542US2012286063A1Urea injector diagnostics using spectral analysis for scr nox reduction systemWANG YUE-YUN·Filed 2011·Application pending·0 cites
- 3635US2009158830A1Artificial neural network enhanced misfire detection systemMALACZYNSKI GERARD W·Filed 2007·Application pending·0 cites
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