Steady-State Vehicle Dynamics

2014 ◽  
pp. 3-30 ◽  
Author(s):  
Hormoz Marzbani ◽  
Reza N. Jazar ◽  
M. Fard
Keyword(s):  
Steady State ◽  
Vehicle Dynamics

Model Predictive Controller Design for Vehicle Motion Control at Handling Limits in Multiple Equilibria on Varying Road Surfaces

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6667
Author(s):  
Szilárd Czibere ◽  
Ádám Domina ◽  
Ádám Bárdos ◽  
Zsolt Szalay
Keyword(s):  
Steady State ◽  
Vehicle Dynamics ◽  
Multiple Equilibria ◽  
Stability Control ◽  
Equilibrium Analysis ◽  
Stable Region ◽  
Test Scenario ◽  
Sideslip Angle ◽  
Road Surfaces ◽  
Vehicle Motion

Electronic vehicle dynamics systems are expected to evolve in the future as more and more automobile manufacturers mark fully automated vehicles as their main path of development. State-of-the-art electronic stability control programs aim to limit the vehicle motion within the stable region of the vehicle dynamics, thereby preventing drifting. On the contrary, in this paper, the authors suggest its use as an optimal cornering technique in emergency situations and on certain road conditions. Achieving the automated initiation and stabilization of vehicle drift motion (also known as powerslide) on varying road surfaces means a high level of controllability over the vehicle. This article proposes a novel approach to realize automated vehicle drifting in multiple operation points on different road surfaces. A three-state nonlinear vehicle and tire model was selected for control-oriented purposes. Model predictive control (MPC) was chosen with an online updating strategy to initiate and maintain the drift even in changing conditions. Parameter identification was conducted on a test vehicle. Equilibrium analysis was a key tool to identify steady-state drift states, and successive linearization was used as an updating strategy. The authors show that the proposed controller is capable of initiating and maintaining steady-state drifting. In the first test scenario, the reaching of a single drifting equilibrium point with −27.5° sideslip angle and 10 m/s longitudinal speed is presented, which resulted in −20° roadwheel angle. In the second demonstration, the setpoints were altered across three different operating points with sideslip angles ranging from −27.5° to −35°. In the third test case, a wet to dry road transition is presented with 0.8 and 0.95 road grip values, respectively.

A Model Vehicle for Measuring Handling Characteristics Using the Tethered Testing Technique

1995 ◽  
Vol 23 (3) ◽  
pp. 258-272
Author(s):  
L. C. Hall
Keyword(s):  
Steady State ◽  
Vehicle Dynamics ◽  
Practical Work ◽  
Testing Technique ◽  
Vehicle Handling ◽  
Automotive Engineering ◽  
Handling Characteristics

A model vehicle has been designed and constructed to provide practical work in vehicle dynamics for students of automotive engineering. Its handling characteristics can be measured using the technique of tethered testing. It has been in regular use for sixteen years at the RMCS and has proved invaluable in giving students an opportunity to observe the effects of compliant tyres on vehicle handling and to achieve a deeper understanding of steady-state handling theory.

scholarly journals Improving The Manoeuvrability of Electric Vehicle with Four-Wheel Drive and Four-Wheel Steering – A Nonlinear Model Vehicle Dynamics Approach

2018 ◽  
Vol 225 ◽  
pp. 05016
Author(s):  
M.I. Ishak ◽  
P.M. Heerwan ◽  
M.A.H. Rasid
Keyword(s):  
Numerical Simulation ◽  
Steady State ◽  
Electric Vehicle ◽  
Nonlinear Model ◽  
Rotational Speed ◽  
Vehicle Dynamics ◽  
High Speed ◽  
Passive Control ◽  
Vehicle Speed ◽  
Linear And Nonlinear

The dynamics motion of a vehicle is inherently a nonlinear dynamics system especially at high speed. Majority of past researches on four-wheel steering (4WS) vehicle adopt easier way of modelling a control system based on vehicle with linear dynamic equation of motion. This paper study on the vehicle dynamics of an electric vehicle with 4WD and 4WS based on nonlinear vehicle dynamic approach. A numerical simulation was performed to analyse the variance of a linear model and nonlinear model during cornering at various constant speed. The results show that during low speed cornering at 10 km/h, the linear and nonlinear model produced similar steady state cornering based on the trajectory and yaw rotational speed. However, the variants of linear and nonlinear started to appear as the vehicle speed increase. By obtaining the steady state cornering speed, another numerical simulation was performed to analyse the characteristics of the 4WD and 4WS electric vehicle. A passive control of the rear wheels’ steer angle was implement in the simulation. The results show that the parallel steering mode decreased the yaw rotational speed which broaden the trajectory of the cornering, while the opposite steering mode increased the yaw rotational speed that led to a tighter trajectory during cornering.

scholarly journals Transient and steady-state rotation centre of vehicle dynamics

2017 ◽  
Vol 1 (1) ◽  
pp. 97 ◽  
Author(s):  
Hormoz Marzbani ◽  
D.Q. Vo ◽  
Ali Khazaei ◽  
Mohammad Fard ◽  
Reza N. Jazar
Keyword(s):  
Steady State ◽  
Vehicle Dynamics ◽  
Transient And Steady State

scholarly journals Transient and steady-state rotation center of vehicle dynamics

2017 ◽  
Vol 112 ◽  
pp. 1404-1411 ◽  
Author(s):  
Hormoz Marzbani ◽  
Dai Q. Vo ◽  
Ali Khazaei ◽  
M. Fard ◽  
Reza N. Jazar
Keyword(s):  
Steady State ◽  
Vehicle Dynamics ◽  
Rotation Center ◽  
Transient And Steady State

The UniTire model: a nonlinear and non-steady-state tyre model for vehicle dynamics simulation

2005 ◽  
Vol 43 (sup1) ◽  
pp. 341-358 ◽  
Author(s):  
Konghui Guo ◽  
Dang Lu ◽  
Shih-ken Chen ◽  
William C. Lin ◽  
Xiao-pei Lu
Keyword(s):  
Steady State ◽  
Vehicle Dynamics ◽  
Dynamics Simulation ◽  
Tyre Model

A Empirical Tire Model of Non-Steady State Cornering Properties Considering Carcass Elasticity

2000 ◽  
Author(s):  
Yongping Hou ◽  
Yujin Hu ◽  
Chenggang Li ◽  
Konghui Guo
Keyword(s):  
Steady State ◽  
High Precision ◽  
Test Data ◽  
Vehicle Dynamics ◽  
Low Frequency ◽  
Frequency Region ◽  
Tire Model ◽  
Yaw Angle ◽  
Tire Models

Abstract The purpose of this paper is to present two empirical tire models of non-steady state cornering property with respect to yaw angle input in low frequency region on the basis of existing tire model and considering the elasticity of the carcass. Verified by test, theoretical values meet well with test data. Comparing with existing tire models, the models described in the paper have more advantages, and they also have high precision. They can be applied for vehicle dynamics studies.

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