| Popis: |
In this study, the various influences on backpressure based DPF monitoring have been investigated. A number of inputs are influenced by tolerances that negatively affect measured pressure, modelled volume flow and modelled backpressure. A simulation has been performed to evaluate the influence of those tolerances on the final diagnostic robustness. For some of the tolerances, state-of-the-art tolerance values have been defined. Based on the simulation, upper limits were defined for the remaining tolerances. In a series application, if the defined tolerances can be met, a robust monitoring of a DPF using just the pressure sensor appears to be possible. In this case, no other monitoring strategy, e.g. a PM sensor, is needed. |
