A method for the quality assurance of exhaust gas behavior in a motor vehicle, particularly in a hybrid vehicle, includes monitoring an on-board-diagnosis function; providing a journey counter a diagnosis counter, and a nominal diagnosis frequency value; incrementing the journey counter following the beginning of a driving cycle; generating an actual diagnosis frequency value using a combination of the diagnosis counter and the drive counter; and establishing a difference between the nominal diagnosis frequency value and the actual diagnosis frequency value. If the difference falls short of a threshold: a control method is selected, which is designed to successfully complete a currently running OBD of the OBD function and to initiate and complete a non-running OBD. Following the completion of the OBD of the OBD function, the diagnosis counter is incremented and the motor control restored to an original motor control.

An automatic calibration method capable of adapting the set of conditions for performing hardware diagnostics, in an OBD system, with a view to optimising the compromise between the number of diagnostics performed, in particular in order to comply with legislation relating to the ratio between the number of diagnostics performed on a component and the number of operating cycles, and the accuracy of the diagnostics.

A method for monitoring the operation of a sensor is provided. The method comprises the step of representing the operation of the sensor by: i) storing a plurality of data values, each data value corresponding to the sensor output signal, wherein said step is performed during a time period such that said data values are distributed over a range of possible data values, ii) defining a plurality of discrete intervals within said range of possible data values; and iii) calculating the frequency of the data values within each interval thus forming a sensor representation. The method further comprises the steps of receiving at least one reference sensor representation; and comparing said sensor representation with said at least one reference sensor representation.

The abnormality diagnosis system 1, 1, 1 of an ammonia detection device 46, 71 comprises: an air-fuel ratio detection device 41, 72 arranged in the exhaust passage 22 at the downstream side of the catalyst 20; an air-fuel ratio control part 51 configured to control an air-fuel ratio of exhaust gas; and an abnormality judgment part 52 configured to judge abnormality of the ammonia detection device. The air-fuel ratio control part performs rich control making the air-fuel ratio of the inflowing exhaust gas richer than a stoichiometric air-fuel ratio. The abnormality judgment part judges that the ammonia detection device is abnormal if, after start of the rich control, an output value of the ammonia detection device does not rise to a reference value before the air-fuel ratio detected by the air-fuel ratio detection device falls to a rich judged air-fuel ratio richer than a stoichiometric air-fuel ratio.

In one embodiment, a system may include a gas turbine system. the gas turbine system includes a gas turbine, an after-treatment system that may receive exhaust gases from the gas turbine system, and a controller that may receive inputs and model operational behavior of an industrial plant based on the inputs. The industrial plant may include the gas turbine and the after-treatment system. The controller may also determine one or more operational parameter setpoints for the industrial plant, select the one or more operational parameter setpoints that reduce an output of a cost function, and apply the one or more operational parameter setpoints to control the industrial plant.

In the case of a method for checking the plausibility of a NOx sensor (62; 63) in an SCR catalytic converter system having at least one first SCR catalytic converter device (20) and having at least one second SCR catalytic converter device (30) and having in each case one dosing point (40, 50) for a reducing agent solution for the SCR catalytic converter devices (20, 30) upstream of the respective SCR catalytic converter device, the NOx sensor (62) to be checked for plausibility is situated either between the first SCR catalytic converter device (20) and the second SCR catalytic converter device (30), or the NOx sensor (63) to be checked for plausibility is situated downstream of the second SCR catalytic converter device (30).

An aftertreatment system comprises a particulate filter configured to filter PM possessing a predetermined, least effective size range included in an exhaust gas flowing through the aftertreatment system. A PM sensor assembly is positioned downstream of the particulate filter and includes a housing having an inlet, an outlet, a sidewall and defines an internal volume. A PM sensor is positioned within the internal volume. The housing is configured to redirect a flow of exhaust gas entering the PM sensor assembly around the PM sensor so that small particles included in the exhaust gas flow having a first size within or smaller than the predetermined size range are directed around the particulate matter sensor. Large particles having a second size larger than the predetermined size range impact the PM sensor. A controller is communicatively coupled to the PM sensor.

A controller for a vehicle includes failure diagnosis circuitry and drive control circuitry. The failure diagnosis circuitry is configured to perform a failure diagnosis of an internal combustion engine system while an internal combustion engine is in operation. The drive control circuitry is configured to operate the internal combustion engine in a charge depleting mode operation in which an electric motor mainly moves the vehicle while the internal combustion engine is not run only for charging a battery. The drive control circuitry is configured to run the internal combustion engine if a predetermined condition is satisfied in the charge depleting mode operation. The drive control circuitry is configured to continue running the internal combustion engine in order to perform the failure diagnosis even if the predetermined condition is unsatisfied while the internal combustion engine is run in the charge depleting mode operation.

A system and method to rapidly perform emissions measurements of in-use vehicles being driven by the general public for comparison with vehicle inspection OBD emission fault code testing results for determining if the inspection results indicate that false failures are being generated for a particular vehicle group, such as based on make and model, engine size, engine combustion management technology and/or pollution control technology, or determining if the inspection results correlate with increased in-use emissions. The system may access or integrate with a database of vehicle inspection OBD emission fault code testing results that may be analyzed to evaluate the existence of higher than normal or expected OBD failure rates for emissions related items. The system and method require no recruitment testing of in-use vehicles with potentially detectable connections, but instead incorporate a vehicle emissions remote sensing device that does not require mechanical or electrical connection to the vehicle.

Methods and systems are provided for monitoring and adapting sensors and actuators in the induction system and exhaust system of an internal combustion engine during a period of time in which fresh air is flowing through the internal combustion engine without fuel delivery. According to the disclosure, the period of time in which fresh air is flowing through the internal combustion engine when fuel delivery is turned off and the monitoring and adapting is being carried out is extended by transferring torque produced by electric motor to the internal combustion engine.