Determining the presence of a particle filter in the exhaust gas tract of an engine, with the steps of determining a first exhaust gas temperature curve which occurs in the exhaust gas tract upstream of the particle filter; measuring a second exhaust gas temperature curve by a first temperature sensor arranged downstream of the particle filter; determining a first heat quantity by integration over a specific time of a first heat flow curve determined by a first exhaust gas mass flow, a first specific heat capacity and the first exhaust gas temperature curve; determining a second heat quantity by integration over the specific time of a second heat flow curve determined by a second exhaust gas mass flow, a second specific heat capacity and the second exhaust gas temperature curve, evaluating the first heat quantity and the second heat quantity to determine the presence of the correct particle filter.

A method for determining a presence of a particle filter in the exhaust gas tract of a petrol-operated internal combustion engine comprises: determining a measured differential pressure curve from a first pressure curve measured in the exhaust gas tract using a first pressure sensor arranged upstream of an installation position of the particle filter, and a second pressure curve measured using a second pressure sensor arranged downstream of an installation position determining a first result curve with a first low-pass filtration of the measured differential pressure curve; determining a second result curve by means of a second low-pass filtration of the first result curve; determining a first differential result curve by forming the difference between the first result curve and the second result curve; determining a first amount result curve by forming the amount of the first differential result curve; determining an expected differential pressure curve.

Diagnostics for inadequate performance and/or degradation of an exhaust aftertreatment system are disclosed. A performance degradation analysis of the exhaust aftertreatment system includes a determination of a long term brake specific NOx value over a time period and a comparison of the long term brake specific NOx value to a threshold value.

An exhaust purification system is provided with a NOx-occlusion-reduction-type catalyst and a NOx purge rich control unit that executes NOx purge of reducing and purifying the occluded NOx by putting the exhaust into a rich state by fuel injection control, in a case where a catalyst temperature of the NOx-occlusion-reduction-type catalyst is equal to or higher than a catalyst temperature threshold value and a NOx occlusion amount of the NOx-occlusion-reduction-type catalyst is equal to or higher than an NOx occlusion amount threshold value, and executes the NOx purge even when the NOx occlusion amount is less than the NOx occlusion amount threshold value, in a case where the catalyst temperature is equal to or higher than a catalyst temperature threshold value which is greater than the catalyst temperature threshold value.

A method of adaptively sampling data to determine the start of injection in a solenoid actuated valve of a fluid injector includes, in an operating cycle or portion thereof of the valve, sampling the signal of current through a solenoid of the valve at sampling points having a pre-defined interval therebetween. At each sampling point, determining the value of the first derivative of current and detecting the sampling point at which the first derivative achieves a maximum as the start of injection. Values of the first derivative of the sampling points immediately preceding and immediately following the start of injection are determined. In a subsequent operating cycle, sycrhonisation of sampling is altered to shift sampling times depending on the values of the first derivative of the sampling points immediately preceding and immediately following the start of injection.

When a user requests start-up of an internal combustion engine while PM removal control is in execution or immediately after execution of the PM removal control is completed, an electronic control unit informs the user of the vehicle of a first alarm, so that the user recognizes that the internal combustion engine cannot be started up immediately. This makes it possible to suppress the discomfort caused because the internal combustion engine is not started up.

A particulate detection system detects the amount of particulates contained in filtered exhaust gas which has passed through a filter and is discharged to the outside of the vehicle. The particulate detection system includes a sensor disposed on the downstream side of the filter; a sensor circuit section which drives the sensor and obtains in real time a sensor output corresponding to the volumetric particulate amount of the particulates contained in the filtered exhaust gas; and a computation section which computes a distance particulate amount which is the weight or number of the particulates discharged per unit travel distance on the basis of the sensor output obtained by the sensor circuit section, travel distance of the vehicle, and flow rate of the exhaust gas.

There is provided the diagnostic device for a sensor which is arranged in an exhaust passage of an internal combustion engine and detects a particulate matter amount in exhaust, the diagnostic device including a time-rate-of-change calculation unit which calculates a time rate of change of the particulate matter amount detected by the sensor during a period in which a fuel injection amount of the internal combustion engine is equal to or less than a predetermined injection amount threshold, and an abnormality determination unit which determines an abnormality of the sensor based on the time rate of change of the particulate matter amount calculated by the time-rate-of-change calculation unit.

An aftertreatment system comprises an aftertreatment component structured to decompose constituents of an exhaust gas produced by an engine. A reductant insertion assembly is fluidly coupled to the aftertreatment component and configured to insert a reductant therein. A controller is operatively coupled to the reductant insertion assembly and configured to instruct the reductant insertion assembly to insert the reductant into the aftertreatment component for a first insertion time between first time intervals. The controller determines an operating condition of the engine, and determines if the operating condition satisfies a predetermined condition. In response to the predetermined condition being satisfied, the controller instructs the reductant insertion assembly to insert the reductant into the aftertreatment component for a second insertion time between second time intervals. The second insertion time is longer than the first insertion time.

A method for correcting for aging in particulate matter sensors for a diesel engine includes calculating calculated particulate matter values for a modeled diesel engine exhaust system over a period of time, measuring measured test particulate matter values with a test particulate matter sensor over the period of time in a test diesel engine exhaust system, determining differences between the calculated particulate matter values and the measured test particulate matter values from the test particulate matter sensor over the period of time, and correcting measured particulate matter values in at least one other particulate matter sensor over a same period of time based on the determined differences to obtain a corrected particulate matter value. A particulate matter sensor arrangement and a vehicle including a particulate matter sensor arrangement are also provided.