Dynamics models for vehicle roll motion in prerollover manoeuvres

The main functions of suspension system are to provide ride comfort for the passengers and vehicle handling (road holding). But, in many studies, full attention to the ride comfort leads to the determination of incorrect suspension system parameters as well as other problems such as rollover and reducing road-holding ability in the vehicle. The aim of this study is to present a method for the optimized design of the vehicle suspension system in order to improve the ride comfort, road holding, workspace and preventing rollover, considering a full vehicle model with 11-DOF. The most important feature of this study is that the prevention of rollover factor and all of suspension functions are considered simultaneously. In this research, in order to assess the ride comfort, the vertical acceleration values of seats that are caused by random road roughness are calculated by power spectral density of road in frequency domain. In the context of prevention of rollover, Fishhook manoeuvre is performed using a mathematical model for the roll motion, and then the dynamic behaviour of the variables is considered in rollover threshold. Then, the optimization problem is solved to minimize the vertical acceleration values and vehicle roll angle by considering the physical limitation and safety of the model. The results of the optimization show that the vertical acceleration, in frequency domain at the desired boundary values (as defined in ISO 2631), decreases and rollover resistance of the vehicle increases.

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“…where the values of a 1 and b 1 for the two types of roads in equation (21) are presented in Table 6. 11…”

Section: Parameters Lower Boundmentioning

confidence: 99%

Optimum design for passive suspension system of a vehicle to prevent rollover and improve ride comfort under random road excitations

Seifi

Hassannejad

Hamed

2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…These models are effective tools to design the control systems for rollover prevention. 26 Besides, there are some research works in order to improve of the handling of the heavy vehicles in which control systems have been utilized. [27][28][29] Cheng and Cebon 30 proposed a new active trailer steering system to decrease the rollover probability of an articulated vehicle.…”

Section: Introductionmentioning

confidence: 99%

A new robust combined control system for improving manoeuvrability, lateral stability and rollover prevention of a vehicle

Saeedi

2019

Proceedings of the Institution of Mechanical Engineers, Part K:

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This paper presents a new effective method in order to achieve an appropriate performance for a four-wheeled vehicle during different conditions. The main goal of the study is focused on the handling improvement and lateral stability increment of the vehicle using a robust combined control system. First, in order to increase the vehicle's manoeuvrability, an active steering control system is proposed based on the sliding mode control method and using the simplified dynamic model. The tracking of the desired values of the yaw rate and lateral velocity of the vehicle is the main purpose for using the controller. Also, in order for verifying the performance of the sliding mode controller, the linearization feedback control method is used to design the active steering control system. Moreover, to improve the directional stability of the vehicle, a new active roll control system is proposed. In this control system, the roll angle is considered as the state variable as well as the active anti-roll-bar is utilized as an actuator to generate the roll moment. Then, a 14-degrees-of-freedom nonlinear dynamic model of the vehicle validated using CarSim software is utilized. Afterward, the performance of the designed combined control system is investigated at various velocities. The simulation results confirm that the combined control system has an important effect on vehicle's manoeuvrability improvement and its lateral stability increment, especially during severe transient manoeuvre.

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“…They are helpful tools to develop the control algorithms of the AARB and active suspension (AS) systems in order to enhance the roll stability. 17 Rahnejat and coworkers 18 researched the effects of anti-roll bar on the bounce, pitch and roll dynamics of vehicles. Some research activities [19][20][21][22] have been focused on integrating the AS and ESC systems to achieve a better lateral stability in the critical steering.…”

Section: Introductionmentioning

confidence: 99%

Integrated vehicle dynamics control using semi-active suspension and active braking systems

Soltani

Bagheri

Azadi

2017

Proceedings of the Institution of Mechanical Engineers, Part K:

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This article presents an integrated control of yaw, roll and vertical dynamics based on a semi-active suspension and an electronic stability control with active differential braking system. During extreme manoeuvres, the probability of vehicle rollover is increased and the stability of lateral and yaw vehicle motions is deteriorated because of the saturation of tyre forces. Furthermore, when the road excitation frequencies are equal to the natural frequencies of the unsprung masses, the resonance phenomena occurs, which causes some oscillations getting revealed on responses of the yaw and lateral vehicle dynamics. In these situations, the active braking alone cannot be helpful to improve the vehicle handling and stability, considerably. In order to overcome these difficulties, a coordinated control of the semi-active suspension and the active braking is proposed, using a fuzzy controller and an adaptive sliding mode controller, respectively. A non-linear full vehicle model with 14 degrees of freedom is established and combined with the modified Pacejka tyre model. As the majority of vehicle dynamics variables and the road profile inputs cannot be measured in a cost-efficient way, a non-linear estimator based on unscented Kalman filter is designed to estimate the entire vehicle dynamics states and the road unevenness. Simulation results of the steering manoeuvres on the random road inputs show that the proposed chassis system can effectively improve the vehicle handling, stability and ride comfort.

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Dynamics models for vehicle roll motion in prerollover manoeuvres

Cited by 8 publications

References 15 publications

Optimum design for passive suspension system of a vehicle to prevent rollover and improve ride comfort under random road excitations

Optimum design for passive suspension system of a vehicle to prevent rollover and improve ride comfort under random road excitations

A new robust combined control system for improving manoeuvrability, lateral stability and rollover prevention of a vehicle

Integrated vehicle dynamics control using semi-active suspension and active braking systems

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