Tao Sun

University of Ontario Institute of Technology | UOIT · Faculty of Engineering and Applied Science

This paper presents a nonlinear lateral stability analysis of a road vehicle by examining the nonlinear dynamic features and evaluating the effectiveness of active safety systems (ASSs). To this end, we perform a bifurcation analysis using the handling diagram method and Lyapunov stability theory to evaluate the nonlinear lateral stability and hand...

This paper presents a bifurcation analysis for car-trailer lateral stability considering the variation of forward vehicle velocity. As an important aspect in car-trailer dynamics, the lateral stability has a strong influence on the overall vehicle safety. To increase car-trailer safety, it is vital to estimate the lateral stability region. With res...

This paper presents a parametric study of linear lateral stability of a car-trailer (CT) combination in order to examine the fidelity, complexity, and applicability for control algorithm development for CT systems. Using MATLAB software, a linear yaw-roll model with 5 degrees of freedom (DOF) is developed to represent the CT combination. In the cas...

This paper presents nonlinear bifurcation stability analysis of articulated vehicles with active trailer differential braking (ATDB) systems. ATDB systems have been proposed to improve stability of articulated vehicle systems to prevent unstable motion modes, e.g., jack-knifing, trailer sway and rollover. Generally, behaviors of a nonlinear dynamic...

An innovative phase-plane analysis method is proposed to assess the roll stability of articulation vehicles. It is well know that the roll instability of articulated vehicles is one of the most serious problems resulting in loss of life and property for drivers. Hence, it is necessary to develop active anti-roll systems to enhance the roll stabilit...

The phase-plane analysis technique has become a powerful tool for analyzing lateral stability of single-unit vehicles. Articulated vehicles, such as car-trailer combinations, consist of multiple vehicle units. Multi-unit vehicles exhibit unique dynamic features compared against single-unit vehicles. For example, a car-trailer may exhibit one of the...

To date, Linear Quadratic Regulator (LQR) controllers based on linear vehicle models have been researched and developed for improving the lateral stability of car-trailer (CT) combinations. However, in the LQR controller design, there is no a systematic way to determine the weighting factors of the performance index. Generally, the weighting factor...

To date, various control strategies based on linear vehicle models have been researched and developed for improving lateral stability of car-trailer (CT) systems. Is a linear-model-based controller applicable to active safety systems for CT systems under emergency operating conditions, such as an evasive maneuver at high lateral accelerations? In o...

This paper presents an active trailer braking controller for improving the lateral stability of car-trailer systems. Due to car-trailer systems' special and complex structures, these vehicles exhibit unique unstable motion modes, such as trailer swing, jack-knifing and rollover. These unstable motion modes may lead to fatal accidents. The effects o...

This paper presents a benchmark investigation on control algorithms for active trailer steering (ATS) systems of articulated heavy vehicles (AHVs). Two control algorithms are designed for the ATS systems of AHVs, which are derived using the Fuzzy Logic Control (FLC) and Linear Quadratic Regulator (LQR) techniques, respectively. The two algorithms a...

An active trailer braking controller to improve the lateral stability of car-trailer systems is presented. The special and complex structures of these types of vehicles exhibit unique unstable motion behavior, such as the trailer swing, jack-knifing and the vehicle rollover. These unstable motion modes may lead to fatal accidents. The effects of pa...