A general rollover index for tripped and un-tripped rollovers on flat and sloped roads

Ataei, Mansour; Khajepour, Amir; Jeon, Soo

doi:10.1177/0954407017743345

Cited by 29 publications

(24 citation statements)

References 40 publications

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“…[1][2][3] Vehicle lateral stability control has been developed for preventing vehicle from spinning and drifting, thereby increasing vehicle maneuverability and safety. [4][5][6] Active stability systems help the drivers under harsh conditions, such as slippery road or aggressive maneuvering, to safely control the vehicle. Differential braking, torque vectoring, and active steering are well-known lateral stability systems.…”

Section: Introductionmentioning

confidence: 99%

Active camber system for lateral stability improvement of urban vehicles

Ataei

Tang

Khajepour

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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A suspension system with the capability of cambering has an additional degree of freedom for changing camber angle to increase the maximum lateral tire force. This study investigates the effects of cambering on overall vehicle stability with emphasis on applications to urban vehicles. A full vehicle model with a reliable tire model including camber effects is employed to investigate the vehicle dynamics behavior under cambering. Besides, a linearized vehicle model is used to analytically study the effects of camber lateral forces on vehicle dynamics. Vehicle behavior for different configurations of camber angles in front and rear wheels is studied and compared. Then, an active camber system is suggested for improvement of vehicle lateral stability. Specifically, performances of active front camber, active rear camber, and their combination are investigated. The results show that a proper strategy for camber control can improve both yaw rate and sideslip angle, simultaneously. Finally, the active front camber system is compared with the well-known active front steering. It is shown that, utilizing more friction forces at the limits, active front camber is more effective in improving maneuverability and lateral stability than active front steering.

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Section: Introductionmentioning

confidence: 99%

Active camber system for lateral stability improvement of urban vehicles

Ataei

Tang

Khajepour

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Rollover detection has been studied in many researches, and a variety of methods of detecting vehicle rollover have been used in the past decades, such as the time-to-rollover metric and the lateral LTR. 28,29 LTR, which is considered as the most reliable RI, is used to quantify vehicle rollover propensity in this paper. For a single-unit heavy vehicle, LTR is defined as…”

Section: Hdv Modelingmentioning

confidence: 99%

A hierarchical adaptive control framework of path tracking and roll stability for intelligent heavy vehicle with MPC

Tian

Huang

Cao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Roll stability is a major concern in the path tracking process of intelligent heavy vehicles in emergency steering maneuvers. Due to the coupling of lateral and roll motions of heavy vehicle, steering actions for path tracking may come into conflict with that for roll stability. In this paper, a hierarchical adaptive control framework composed of a supervisor, an upper controller and a lower controller is developed to mediate conflicting objectives of path tracking and roll stability via steering control. In the supervisor, path tracking control mode or cooperative control mode of path tracking and roll stability is determined by the predicted rollover index, and a weight function is introduced to balance the control objectives of path tracking and roll stability in cooperative control mode. Then, in order to achieve multi-objective real-time optimization, model predictive control with varying optimization weights is used in the upper controller to calculate the desired front steer angle. The lower controller which integrates the real electrically assisted hydraulic steering system based on Proportional-Integral-Derivative control is designed to control steering wheel angle. Simulation and hardware-in-loop implementation results in double lane change scenario show that the proposed hierarchical adaptive control framework can enhance roll stability in emergency steering maneuvers while keeping the accuracy of path tracking for intelligent heavy vehicle within an acceptable range.

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“…21 The improvement in the rollover stability and the development of active rollover mitigation systems have been addressed in the literature. [22][23][24] Rollover mitigation of a vehicle usually includes two steps. The first step is the detection of the rollover danger.…”

Section: Introductionmentioning

confidence: 99%

“…For conventional 4W vehicles, different rollover indices are proposed in the literature. 22 The initial rollover metrics have been based on static or steady-state rollover models. Dynamic rollover indices are also proposed; these include vehicle states in order to provide more accurate rollover indicators for dynamic situations.…”

Section: Introductionmentioning

confidence: 99%

“…However, the values for the vertical tyre forces cannot be easily measured, 25 and so different representations are suggested to express the LTR in terms of measurable vehicle states. 22 The most common approach in the literature is to represent the LTR based on the vehicle's body parameters including the lateral acceleration and the roll angle. 26,27 The rollover stability of 3W vehicles has also been investigated in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Rollover stabilities of three-wheeled vehicles including road configuration effects

Ataei

Khajepour

Jeon

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study investigates the rollover stabilities of three-wheeled vehicles including the effects of road configurations. Tripped and untripped rollovers on flat and sloped roads are studied, and a new rollover index is introduced. To explore the unique dynamic behaviours of three-wheeled vehicles, the rollover stability is investigated on the basis of the lateral load transfer ratio, and the proposed rollover index is expressed in terms of measurable vehicle parameters and state variables. In addition to the effects of the lateral acceleration and the roll angle, the proposed rollover index takes the effects of the longitudinal acceleration and the pitch angle into account as well as the effects of banked roads and graded roads. Lateral and vertical road inputs are also considered since they can represent the effects of kerbs, soft soil and road bumps as the main causes of tripped rollovers. Sensitivity analysis is also provided in order to evaluate and compare the effects of different vehicle parameters and different state variables on the rollover stabilities of three-wheeled vehicles. To evaluate the proposed rollover index, simulations are also conducted using a high-fidelity CarSim model for a three-wheeled vehicle.

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A general rollover index for tripped and un-tripped rollovers on flat and sloped roads

Cited by 29 publications

References 40 publications

Active camber system for lateral stability improvement of urban vehicles

Active camber system for lateral stability improvement of urban vehicles

A hierarchical adaptive control framework of path tracking and roll stability for intelligent heavy vehicle with MPC

Rollover stabilities of three-wheeled vehicles including road configuration effects

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