By Prof. Dr. Lino Guzzella, Dr. Antonio Sciarretta (auth.)
Automobiles are chargeable for a considerable a part of the world's intake of basic power, often fossil liquid hydrocarbons. The relief of the gasoline intake of those automobiles has develop into a best precedence. Many rules to arrive that aim were offered. typically those platforms are extra advanced than the conventional methods. For such complicated platforms a heuristic layout technique fails. the one solution to take care of this example is to hire model-based equipment. this article presents an advent to the mathematical modeling and next optimization of car propulsion structures and their supervisory keep watch over algorithms.
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Additional info for Vehicle Propulsion Systems: Introduction to Modeling and Optimization
For this reason, normalized variables are introduced in the next section. Using these variables, the engine size can be used as an optimization parameter. 2 Normalized Engine Variables When the engine runs in steady-state conditions, two normalized variables describe its operating point. 4) where ωe is the engine speed, Te the engine torque, Vd the engine’s displacement, and S its stroke. 4). 1 IC Engine Models 45 Obviously, the mean piston speed is the piston speed averaged over one engine revolution.
Ch/research/qss/. The QSS Toolbox fulfills the three requirements stated at the beginning of this section. The issue of scalability is discussed in the subsequent chapters. The interconnectability is guaranteed by interface structures that are compatible with the quasistatic method. 19 shows some of the QSS Toolbox elements. Two examples that use the QSS Toolbox have been included in this text (see the example in Sect. 1). ω ICE T EM Pe T Pc FA ω1 γ PA I I T2 Pc FC U M FT Hl I ω2 GB T1 Pe * m Hl m* ω Pc U Q BT I U Q SC U Fig.
14. IC engine fuel consumption in liters per hour as a function of engine torque and speed. For the example of a standard IC engine powertrain, Fig. 15 shows the simplified structure of an algorithm that computes on a digital computer the vehicle’s fuel consumption using the quasistatic method. For relatively simple powertrain structures the algorithm illustrated in Fig. ). 15 initialization, i=0, J=0 i=i+1 input velocity v, gear ratio γ and clutch status c (driving profile) compute engine speed ω m yes ω e < ω ei and c=open no ΔJi = idling interpolate maximum engine torque Te,max from engine map consumpTe > Te,max tion no yes report error compute consumption ΔJi using the engine map and abort J=J+ΔJi repeat until i>n Fig.