A Comparison between Caster and Lean Angle in Generating Variable Camber

Vo, Dai Quoc; Jazar, Reza N.; Fard, Mohammad

doi:10.4271/2015-01-0067

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…In comparison with KPI, however, caster is much more effective to create the camber. [9][10][11]13 Therefore, caster is chosen to control the camber to lessen the outward leaning phenomenon of the front steering wheels. To reduce the time of calculation the camber function is simplified.…”

Section: Variable Caster Steering Strategymentioning

confidence: 99%

“…As the W frame initially coincides with the C frame (at zero steering angle), the transformation of coordinates between the two frames is described by the orientation and location of the steering axis, and the steering angle in the C frame. 9,12 The orientation and location of the steering axis are expressed by its direction unit vector u ^ , and a position vector d I : 1,9…”

Section: Kinematics Of a Steerable Tyrementioning

confidence: 99%

“…Mapping coordinates in the wheel coordinate frame onto the wheel-body coordinate frame is governed by the homogeneous transformation: 9,12…”

Section: Kinematics Of a Steerable Tyrementioning

confidence: 99%

“…This may lead to inaccuracy in computing the camber. As camber of a steered wheel can be altered by changing caster angle, [9][10][11] this research develops a method of varying caster for front steering wheels to minimise the outward leaning effect, thereby improving lateral grip capacity. The variable caster may also offset those above disadvantages.…”

Section: Introductionmentioning

confidence: 99%

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Variable caster steering in vehicle dynamics

Marzbani

Fard

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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When a car is cornering, its wheels usually lean away from the centre of rotation. This phenomenon decreases lateral force, limits tyre performance and eventually reduces the vehicle lateral grip capacity. This paper proposes a strategy for varying caster in the front suspension, thereby altering the wheel camber to counteract this outward inclination. The homogeneous transformation was utilised to develop the road steering wheel kinematics which includes the wheel camber with respect to the ground during a cornering manoeuvre. A variable caster scheme was proposed based on the kinematic analysis of the camber. A rollable vehicle model, along with a camber-included tyre force model, was constructed. MATLAB/Simulink was used to simulate the dynamic behaviour of the vehicle with and without the variable caster scheme. The results from step steer, ramp steer, and sinusoidal steer inputs simulations show that the outward leaning phenomenon of the steering wheels equipped with the variable caster, is reduced significantly. The corresponding lateral acceleration and yaw rate increase without compromising other handling characteristics. The actively controlled car, therefore, provides better lateral stability compared to the passive car. The tyre kinematic model and the vehicle dynamic model were validated using multibody and experimental data.

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Section: Variable Caster Steering Strategymentioning

confidence: 99%