Inventor

LEVIJOKI STEPHEN PAUL

US26 patents

⚠️ This page may combine multiple inventors who share the name “LEVIJOKI STEPHEN PAUL”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

LEVIJOKI STEPHEN PAUL

LEVIJOKI STEPHEN PAUL

Exhaust diagnostic system and method with SCR NH3 depletion cleansing mode for initial step in the def quality service healing test

System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems

Method and system for verifying the operation of an SCR catalyst

Exhaust diagnostic systems and methods for resetting after operation with poor reductant quality

System and method for determining selective catalytic reduction dosing system performance using an ammonia sensor

Method and system for controlling a nitrogen oxide (NOx) conversion efficiency monitor

System and method for diagnosing a fault in a switchable water pump for an engine based on a change in crankshaft speed

Intrusive SCR efficency testing systems and methods for vehicles with low temperature exhaust gas

Exhaust diagnostic control system and method with NH3 depletion cleansing

System and method for diagnosing faults in an oxygen sensor

Low coolant temperature fault diagnostic systems and methods

Diagnostic system and method for an oxygen sensor positioned downstream from a catalytic converter

GM GLOBAL TECH OPERATIONS INC

Exhaust gas oxygen sensor fault detection systems and methods using fuel vapor purge rate

Fault diagnostic systems and methods using oxygen sensor impedance

Exhaust diagnostic systems and methods with SCR conversion efficiency monitor disabling

System and method for controlling torque output of an engine when a water pump coupled to the engine is switched on or off

System and method for diagnosing a fault in an oxygen sensor based on engine speed

GM GLOBAL TECH OPERATIONS LLC

System and method for diagnosing a fault in an oxygen sensor based on ambient temperature

Minimum power consumption for cool down diagnostic based on cylinder deactivation

WANG YUE-YUN

Method and apparatus for monitoring a reductant injection system in an exhaust aftertreatment system

Method and apparatus for monitoring a reductant injection system in an exhaust aftertreatment system

KOWALKOWSKI JANEAN E

Exhaust aftertreatment system with diagnostic delay

Efficiency determination for a selective-catalytic-reduction catalyst

PERRIN JAMES M

Diagnostic systems and methods for selective catalytic reduction (SCR) systems based on NOx sensor feedback

BIALAS DANIEL A

Diagnostic system and method for a switchable water pump

WHITNEY CHRISTOPHER E

Coordination of fuel cutoff for fault detection and hybrid operation