With a precondition that a cooling water temperature sensor 16 and an intercooler exit gas temperature sensor 18 have been determined normal, whether an EGR cooler efficiency calculated is within a normal range is determined. When within the normal range, whether there is divergence between a calculation value of an intake temperature to be detected by an intake manifold gas temperature sensor 19 and an actual detection value of the sensor 19 is determined. When not in the normal range, whether the calculation value is excessively low is determined; and, just like the above, whether there is divergence between the calculation value and the actuation detection value of the intake manifold gas temperature sensor 19 is determined. Based on the determinations categorized, whether the EGR cooler 14, EGR gas temperature sensor 17 and intake manifold gas temperature sensor 19 are normal is determined.

A method for recognizing an error in a sensor signal during operation of a fuel injector of an internal combustion engine. In the method, a switch valve of the fuel injector is activated with the aid of an activation signal, and the sensor signal is detected as a signal of a sensor, which is provided for the purpose of detecting characteristic operating points of the fuel injector, in a respectively predefined time window of the sensor signal, which includes a point in time of a characteristic operating point of the fuel injector. At least one property of the sensor signal is determined, which includes a signal level and/or a rise time. It is determined, based on the at least one property of the sensor signal, whether an error is present.

A control system for use in a fluid flow application includes a heater and a control device. The heater includes at least one resistive heating element having a relationship between resistance and temperature defining a non-monotonic curve. The heater is to heat fluid flow. The control device is to determine a flow characteristic of the fluid flow and a temperature of the at least one resistive heating element along the non-monotonic curve between resistance and temperature based on a change in resistance of the at least one resistive heating element.

A heavy-duty truck has a diesel engine, an exhaust after-treatment system, and an engine control unit. The exhaust after-treatment system includes a close-coupled selective catalytic reduction system and an underbody selective catalytic reduction system, a first NO.sub.x sensor upstream of the close-coupled selective catalytic reduction system, a second NO.sub.x sensor between the two selective catalytic reduction systems, and a third NO.sub.x sensor downstream of the underbody selective catalytic reduction system. The engine control unit may perform methods allowing intrusive diagnostics to be performed on exhaust gas NO.sub.x sensors using the selective catalytic reduction systems during normal operation of the heavy-duty truck.

A method of monitoring an exhaust gas sensor coupled in an engine exhaust in an engine is provided. The method includes entering into a variable displacement engine (VDE) mode wherein intake and exhaust valves of a first subset of cylinders of the engine are activated and intake and exhaust valves of a second subset of cylinders of the engine are deactivated prior to a reduced traction fuel shut-off transition; and executing a six-pattern diagnostic during fuel shut-off to identify exhaust gas sensor degradation.

A computer-implemented method is disclosed for diagnostics of NOx sensor(s) of a vehicle. The method compriseswhile the electric motor(s) are not driven by the ICEcontrolling (by processing circuitry of a computer system) the ICE to operate according to a predefined operational mode, wherein the predefined operational mode has a correspondingly predefined expected, non-zero, NOx sensor response, controlling (by the processing circuitry) the NOx sensor(s) to perform measurements associated with the predefined operational mode of the ICE, and acquiring (by the processing circuitry) corresponding measurement results from the NOx sensor(s) for comparison to the predefined expected NOx sensor response.

Systems and methods for diagnosing at least one component in an exhaust aftertreatment system are provided. The system includes an exhaust aftertreatment system coupled to an engine system, at least one sensor, and at least one processing circuit structured to: receive initial sensor data; determine an initial parameter value based on the initial sensor data; determine that the initial parameter does not satisfy an initial threshold; perform operations to diagnose at least one component of the exhaust aftertreatment system comprising: causing the engine system to operate through a sequence of a plurality of engine outputs; receiving a plurality of sensor data, each of the plurality sensor data corresponding to at least one of the plurality of engine outputs; comparing each of the plurality of sensor data to a corresponding threshold; and diagnosing the at least one component based on the comparison.

An internal combustion engine-based system includes an internal combustion engine. The internal combustion engine-based system includes an engine interrupt connected to the engine. The engine interrupt is configured to selectively stop the operation of the engine. The internal combustion engine-based system includes a controller in communication with the engine interrupt. The internal combustion engine-based system includes a carbon monoxide detector in communication with the controller. The controller uses the engine interrupt to stop the operation of the engine when the carbon monoxide detector provides the controller with signals that are representative of a carbon monoxide level proximate the internal combustion engine that together form a trend of building carbon monoxide amounts over a set time interval.

The present disclosure relates to a system for checking a correct mounting of a plurality of sensors, in particular of sensors mounted in an engine system, comprising a controller configured to communicate with the plurality of sensors, wherein the controller is configured to control a switching on or off of the power supply to at least a sub-group of the sensors and to check whether a sensor whose power supply was switched on is communicating, wherein the system is configured such that at least two sensors are connected to a common power supply port and are therefore powered on or off at the same time, wherein the at least two sensors comprise at least two different types of sensors.

The present invention pertains to a detection method for detecting a short-lived speed sensing anomaly of an internal combustion engine. The detection method comprises the steps of performing a sensor health check, detecting an engine speed deviation, performing a torque deviation check and identifying whether the detected engine speed deviation refers to a short-lived speed sensing anomaly based on the sensor health check and the torque deviation check. Furthermore, a device suitable for carrying out the detection method according to the present disclosure may be provided, comprising a control unit configured to perform the detection method according to the invention.