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The ebook provides a whole new technique for the on-board measurements and modeling of fuel concentrations in turbocharged diesel engines. It presents the readers with a complete overview of the state-of-art in NOx and lambda estimation and describes new vital achievements comprehensive through the writer. those contain: the web characterization of lambda and NOx sensors; the improvement of control-oriented versions of lambda and NOx emissions; the layout of computationally effective updating algorithms; and, ultimately, the appliance and overview of the equipment on-board. as a result of its technically orientated technique and leading edge findings on either control-oriented algorithms and digital sensing and remark, this e-book bargains a practice-oriented consultant for college kids, researchers and execs operating within the box of regulate and data engineering.
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Extra resources for Modelling and Observation of Exhaust Gas Concentrations for Diesel Engine Control
They are usually crank-angle solved. 2 The term virtual sensing is often used for RT on-board models for estimating variables that cannot be measured easily or their measurements are not reliable, in contrast with using physical sensors. 3 Summary of the characteristics of different type of models used in the automotive, reproduced from Guardiola et al. (2012) Spatial resolution Time resolution Typical acq. 5–100 Hz No/Very low No Very low Control 0D MV 1–200 Hz Low Low Low Control 0D CAS >1 MHz Low Medium Medium CAE 1D CAS >10 MHz Medium Medium High CAE 3D CAS 1–100 MHz Complex High Very high CAE MV mean value, acq.
3 Dynamic Exhaust Gas Concentration Estimation Previous section has made a review on the different technologies in order to manage the diesel engine and has underlined the need of reliable methods for estimating variables online. 2 Summary of the on-board sensors and control inputs used in a commercial LD diesel engine for control and feedback, and split between the main engine subsystems System Injection Air path AT Inputs u prail [u soi , u id ] pilot,main, post u vgt , u hp , u lp u it , u bp Standard sensors n, prail pboost , m˙ a , Tcool Tboost , pamb , Tamb [u soi , u id ] post , u ur ea Expected sensors pcyl ∗ f uel qualit y m˙ egr , Tegr n vgt , λint ∗ NO x ∗ , soot, λexh ∗ The inputs column defines the main actuator signals in the diesel engine.
Fast Soot Sensors According to (Kasper 2004), particles with lower diameters affect more to alveolar deposition after healthy tests with persons, which underline the risk of underestimating the effect of the residual soot downstream of the DPF. This carries out a sensitive problem for sensors: in addition to robustness, packaging and dynamic limitations, on-board soot sensors must measure with high resolution at low-soot values (this sensitive problem is also linked with NOx sensors). Another problem with soot sensors is the selection of an appropriate metric as different metrics can be used depending on the physical measuring principle: particle number, total mass, sizes or light absorbing properties (opacity).