Abstract: Systems and methods for monitoring health of one or more subsystems of a vehicle system are disclosed. At least one sensor can be operatively coupled to a vehicle subsystem having an operational signature and a control system is coupled to the at least one sensor. Using information provided by the at least one sensor, the control system is structured to generate a reference signature of the subsystem during a learning phase and an operational signature of the subsystem subsequent to the learning phase. Systems and methods for identifying the particular subsystem exhibiting degraded performance are also disclosed.

Abstract: Systems and methods for monitoring health of one or more subsystems of a vehicle system are disclosed. At least one sensor can be operatively coupled to a vehicle subsystem having an operational signature and a control system is coupled to the at least one sensor. Using information provided by the at least one sensor, the control system is structured to generate a reference signature of the subsystem during a learning phase and an operational signature of the subsystem subsequent to the learning phase. Systems and methods for identifying the particular subsystem exhibiting degraded performance are also disclosed.

Abstract: A system and method are provided for diagnosing temperature sensor operation in an exhaust aftertreatment system. Temperature signals from first, second and third temperature sensors and a flow signal are received by a control circuit. The three temperature sensors are positioned in fluid communication with an exhaust flow path fluidly coupled to an exhaust manifold of an internal combustion engine, and the flow signal represents the flow rate of exhaust gas through the exhaust flow path. The control circuit determines average temperature differentials between each of the first, second and third temperature sensors as functions of the flow signal and corresponding ones of the first, second and third temperature signals, and produces a diagnostic fail signal if any of the differences between the average temperature differentials exceed a threshold value.

Abstract: A system and method are provided for diagnosing temperature sensor operation in an exhaust aftertreatment system. Temperature signals from first, second and third temperature sensors and a flow signal are received by a control circuit. The three temperature sensors are positioned in fluid communication with an exhaust flow path fluidly coupled to an exhaust manifold of an internal combustion engine, and the flow signal represents the flow rate of exhaust gas through the exhaust flow path. The control circuit determines average temperature differentials between each of the first, second and third temperature sensors as functions of the flow signal and corresponding ones of the first, second and third temperature signals, and produces a diagnostic fail signal if any of the differences between the average temperature differentials exceed a threshold value.

Abstract: A system is disclosed for diagnosing cylinder misfiring in an internal combustion engine. A control computer is configured to periodically diagnose whether each cylinder of the engine is firing or misfiring, and to log information relating to such cylinder firing or misfiring.

Abstract: A system is disclosed for diagnosing cylinder misfiring in an internal combustion engine. A control computer is configured to periodically diagnose whether each cylinder of the engine is firing or misfiring, and to log information relating to such cylinder firing or misfiring.