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5.6 Parameters measurement5.6.1 Open circuit voltageIn order to measure the open circuit voltage in different state of charges andtemperatures, a constant current is drawn from a fully charged battery in time intervals.After each time interval the open circuit voltage of the battery is measured according tothe state of charge of the battery, shown in figure 5-6 .Once the open circuit voltage getsto a minimum value as given by the manufacturer [26] the battery is totally dischargedand state of charge is zero. Doing some tests on one cell of 6 A.h Lithium-ion batteries atthe HVDC research center the battery open circuit voltage versus state of charge wasmeasured. The measurement results are shown in figure 5-7. The test was done in threetemperatures and with a low current.Figure 5-7 Test procedure for measurement of open circuit voltage32
Figure 5-8 Battery open circuit voltage versus state of charge5.6.2 Charging and Discharging ResistancesIn order to find the charging and discharging resistances, a circuit like the one shown infigure 5-8 is used. In each open circuit voltage a resistor is connected to the terminals ofthe battery. Knowing the terminal voltage, open circuit voltage and current of the battery,the internal resistance of battery is measured as:Rint= Rload.( VOC−Vb) / Vb( 5-13)By measuring open circuit voltage and terminal voltage in different states of chargesand temperatures the curves, shown in figures 5-9 and 5-10, are obtained.33
Page 1: AhaModeling and Simulation of Vehic
Page 4: To my parents, brother and my love
Page 7 and 8: Table of ContentsAcknowledgment....
Page 9 and 10: List of FiguresFigure 2-1: Oil cons
Page 11: List of TablesTable 3-1 List of som
Page 14 and 15: xii
Page 16 and 17: Chapter 4 discusses the dynamics of
Page 18 and 19: The Other environmental effects of
Page 20 and 21: So a modeling tool being able to de
Page 22 and 23: electric motor to provide the tract
Page 24 and 25: Figure 2-8: Configuration of a para
Page 26 and 27: Vehicle system modeling can be done
Page 28 and 29: Figure 3-2: EMTS solution flow-char
Page 30 and 31: Figure 4-2: The deflection of tyre
Page 32: V −Vwheel actualλa=( 4-9)VwheelV
Page 35 and 36: Figure 4-5 Friction coefficient cha
Page 37 and 38: The gear box consists of different
Page 39 and 40: Where• I = discharge current [amp
Page 41 and 42: decreases very rapidly. In electric
Page 43 and 44: Thus, this simulation model is capa
Page 45: VOCRchargeRdischargeSOCTempSOCQmaxT
Page 49 and 50: Figure 5-11 Charging resistance ver
Page 51 and 52: 6 Engine, electric machine and cont
Page 53 and 54: 4 Idle speed 840 rpm5 Peak power 15
Page 55 and 56: 7 Modeling in Simulink/MatlabOnce t
Page 57 and 58: Figure 7-3 Vehicle dynamics block i
Page 59 and 60: 7.3 EngineAs described in Chapter 5
Page 61 and 62: Figure 7-7 Automatic driver model b
Page 63 and 64: 8 Simulation ResultsIn this chapter
Page 65 and 66: Peak generator torque1074 N.mPeak g
Page 67 and 68: Figure 8-5 Wheel speed and translat
Page 69 and 70: Figure 8-7 Engine and generator pow
Page 71 and 72: Figure 8-9 Battery state of charge
Page 73 and 74: 9 ConclusionRegarding the significa
Page 75 and 76: References[1] Shuo Tian, Guijun Cao

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