Automobiles - Vehicle_Dynamics(16)

FHRegensburg,UniversityofAppliedSciencesProf.Dr.-Ing.G.Rill

Figure1.12:DoubleWishboneWheel

Suspension

Figure1.13:McPhersonandMulti-LinkWheelSuspensions

1.4.3.2CasterandKingpinAngle

Thecurrentdirectionofthekingpincanbede nedbytwoangleswithinthevehicle xedcoordinatesystem,Fig.1.14.

IfthekingpinisprojectedintotheyF-,zF-plane,thekingpininclinationangleσcanbereadastheanglebetweenthezF-axisandtheprojectionofthekingpin.

TheprojectionofthekingpinintothexF-,zF-planedeliversthecasterangleνwiththeanglebetweenthezF-axisandtheprojectionofthekingpin.

Withmanyaxlesthekingpinandcasteranglecannolongerbedetermineddirectly.

Thecurrentrotationaxisatsteeringmovements,thatcanbetakenfromkinematiccalculationsheredeliversavirtualkingpin.Thecurrentvaluesofthecasterangleνandthekingpinincli-nationangleσcanbecalculatedfromthecomponentsoftheunitvectorinthedirectionofthe

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