Study on the Larger Bus Body Stability of Bend Steering

2014 ◽  
Vol 494-495 ◽  
pp. 3-7
Author(s):  
Jie Jin ◽  
Fu Ming Qin ◽  
Wei Zhou ◽  
Wen Liang Li
Keyword(s):  
Road Construction ◽  
Steering System ◽  
Lateral Acceleration ◽  
Bend Radius ◽  
Technical Improvement ◽  
Power Train ◽  
Vehicle Modeling ◽  
Stability Performance ◽  
Bus Body ◽  
Turning Radius

When a larger bus steering in the corners, it easily affected by the lateral acceleration so that the vehicle sideslips or rolls over, using the research methods of combining with real vehicle modeling and simulation to ensure the safety and comfort of the passengers. Analyzed and researched systems that affecting vehicles stability performance, including power train, steering system, brake system and the vehicles road model of the system curve .On this basis, compared to the acceleration values which the motorbus body can withstand in different states, proposing the acceleration values when human feel comfortable, uncomfortable and terrible, then conducted simulation tests under different turning radius and speeds. The results showed that: on the premise of ensuring the safety and comfort of vehicle passengers, the allowable speed limit with different bend radius is not the same; then it drew series of limit speeds allowed by series of bend radius, providing a reference and basis for future road construction and motorbus technical improvement.

scholarly journals Coordinated Stability Control Strategy for Intelligent Electric Vehicles Using Vague Set Theory

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Yilin He ◽  
Jian Ma ◽  
Xuan Zhao ◽  
Ruoyang Song ◽  
Xiaodong Liu ◽  
...  
Keyword(s):  
Electric Vehicles ◽  
Control Strategy ◽  
Coordinated Control ◽  
Stability Control ◽  
Lateral Acceleration ◽  
Vague Set ◽  
Yaw Rate ◽  
Stability Performance ◽  
Control Target ◽  
Simulation Results

Aiming at improving the tracking stability performance for intelligent electric vehicles, a novel stability coordinated control strategy based on preview characteristics is proposed in this paper. Firstly, the traditional stability control target is introduced with the two degrees of freedom model, which is realized by the sliding mode control strategy. Secondly, an auxiliary control target further amending the former one with the innovation formulation of the preview characteristics is established. At last, a multiple purpose Vague set leverages the contribution of the traditional target and the auxiliary preview target in various vehicle states. The proposed coordinated control strategy is analyzed on the MATLAB/CarSim simulation platform and verified on an intelligent electric vehicle established with A&D5435 rapid prototyping experiment platform. Simulation and experimental results indicate that the proposed control strategy based on preview characteristics can effectively improve the tracking stability performance of intelligent electric vehicles. In the double lane change simulation, the peak value of sideslip angle, yaw rate, and lateral acceleration of the vehicle is reduced by 13.2%, 11.4%, and 8.9% compared with traditional control strategy. The average deviations between the experimental and simulation results of yaw rate, lateral acceleration, and steering wheel angle are less than 10% at different speeds, which demonstrates the consistency between the experimental and the simulation results.

scholarly journals Advanced Estimation Techniques for Vehicle System Dynamic State: A Survey

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4289 ◽  
Author(s):  
Jin ◽  
Yin ◽  
Chen
Keyword(s):  
Control Systems ◽  
Steering System ◽  
System Dynamic ◽  
Dynamic State ◽  
Future Research ◽  
Active Safety ◽  
Automated Driving ◽  
Estimation Techniques ◽  
Stability Performance ◽  
Vehicle System

In order to improve handling stability performance and active safety of a ground vehicle, a large number of advanced vehicle dynamics control systems—such as the direct yaw control system and active front steering system, and in particular the advanced driver assistance systems—towards connected and automated driving vehicles have recently been developed and applied. However, the practical effects and potential performance of vehicle active safety dynamics control systems heavily depend on real-time knowledge of fundamental vehicle state information, which is difficult to measure directly in a standard car because of both technical and economic reasons. This paper presents a comprehensive technical survey of the development and recent research advances in vehicle system dynamic state estimation. Different aspects of estimation strategies and methodologies in recent literature are classified into two main categories—the model-based estimation approach and the data-driven-based estimation approach. Each category is further divided into several sub-categories from the perspectives of estimation-oriented vehicle models, estimations, sensor configurations, and involved estimation techniques. The principal features of the most popular methodologies are summarized, and the pros and cons of these methodologies are also highlighted and discussed. Finally, future research directions in this field are provided.

Land-Saving Mode of Congo (Brazzaville) Highway One (Phase II)

2012 ◽  
Vol 256-259 ◽  
pp. 1832-1836
Author(s):  
Jing Shi ◽  
Jin Hua Tan ◽  
Nian Zhou
Keyword(s):  
Service Life ◽  
Literature Review ◽  
Traffic Flow ◽  
Phase Ii ◽  
Road Construction ◽  
Cultivated Land ◽  
Turning Radius ◽  
Saving Mode ◽  
Congo Brazzaville ◽  
Land Saving

Plenty of cultivated land has been used for highway construction. Thus Land-saving mode in road construction has drawn more and more attentions. However, inappropriate land-saving mode may result in some kinds of risks during highway's service life. Based on road risk, this paper discusses land-saving mode of Congo (Brazzaville) Highway One (Phase Ⅱ), trying to reach the balance between the two after accomplishing literature review and analyzing the prediction of traffic flow. The result shows that, the project should choose the mode such as proper construction scale and high bridge & tunnel ratio, rather than small turning radius and low roadbed.

Active Four-Wheel Steering System for Zero Sideslip Angle and Lateral Acceleration Control

2003 ◽  
Vol 36 (14) ◽  
pp. 371-376
Author(s):  
Toshihiro Hiraoka ◽  
Osamu Nishihara ◽  
Hiromitsu Kumamoto
Keyword(s):  
Steering System ◽  
Lateral Acceleration ◽  
Sideslip Angle

Limit Steady State Vehicle Handling

1987 ◽  
Vol 201 (4) ◽  
pp. 281-291 ◽  
Author(s):  
J C Dixon
Keyword(s):  
Steady State ◽  
Load Transfer ◽  
Limit State ◽  
Lateral Acceleration ◽  
Design Parameters ◽  
Centre Of Mass ◽  
Vehicle Handling ◽  
Specific Proposal ◽  
Turning Radius ◽  
Mass Position

Previously, limit steady state handling has always been restricted to the qualitative statement that a vehicle has final understeer or final oversteer; it cannot be analysed by the conventional understeer gradient concept. A specific proposal is made for quantification of final understeer or oversteer. This is called the understeer number, and is defned by Nu = (ArAf)-1, where Af and Ar are the lateral acceleration capabilities of the front and rear axles. Thus Nu is non-dimensional, is zero for a notional final neutral vehicle, positive for final understeer and negative for final oversteer. A typical value is 0.150 (rear drive) or 0.220 (front). The various design parameters that influence the understeer number are investigated, and equations are obtained and quantified, including centre of mass position, lateral load transfer distribution, longitudinal load transfer, traction, the components of aerodynamic forces and moments, the effect of non-free differentials and the effect of load increments. The effect of turning radius and slopes is also investigated. Thus the limit state of handling is subject to a quantitative assessment, showing the degree of a vehicle's commitment to final understeer or oversteer.

Vehicle yaw stability control using active rear steering: Development and experimental validation

2016 ◽  
Vol 231 (2) ◽  
pp. 333-345 ◽  
Author(s):  
Baozhen Zhang ◽  
Amir Khajepour ◽  
Avesta Goodarzi
Keyword(s):  
Cost Effective ◽  
Steering System ◽  
Stability Control ◽  
Vehicle Stability ◽  
Stability Performance ◽  
Active Steering ◽  
Vehicle Stability Control ◽  
Yaw Stability ◽  
Suspension Model ◽  
Vehicle Testing

In this paper, a novel pulse active steering system for improving vehicle yaw stability is developed. In the proposed method, pulses are sent to the steerable rear wheels whenever the error between the expected and actual yaw rate is outside a predetermined range. The proposed method and its performance are verified experimentally by full vehicle testing. For this purpose, a simplified vehicle model and a rear suspension model are developed. Vehicle stability is investigated and the steering pulse parameters on the vehicle’s stability are studied. A control system is designed and numerical simulations are performed. Moreover, the active rear steering system is implemented on a Lexus for performing road experiments. Results from simulations and experiments indicate that considerable improvement in the yaw stability performance can be achieved by the proposed system. The proposed method is more cost effective and simpler for vehicle stability control.

Ranking Tires for Heavy Truck Steering Feel Performance Using a Simulation Model2

2006 ◽  
Vol 34 (1) ◽  
pp. 64-82 ◽  
Author(s):  
S. L. Haas
Keyword(s):  
Vehicle Dynamics ◽  
Performance Metrics ◽  
Steering System ◽  
Lateral Acceleration ◽  
Steering Wheel ◽  
Dynamics Model ◽  
Objective Testing ◽  
Steering Feel ◽  
Wheel Torque ◽  
Heavy Truck

Abstract The effects of seven different tire sets on heavy truck steering feel characteristics were demonstrated from objective testing. Also, the steering behavior and vehicle dynamics were modeled in order to determine how well the resulting simulations could rank the steering performance of the tire sets relative to the objective results. The objective testing was performed using a 6×4 tractor with a two-axle flatbed semi-trailer. Measured data included steering wheel torque, steering wheel angle, and lateral acceleration behavior resulting from on-center-type steering tests. In addition, the hydraulic pressure from the power steering system was also measured. The tests consisted of multiple cycles at 0.2 Hz and ±0.2 g. Steering-related performance metrics were selected and calculated based on the interaction between measured parameters. The same test procedure was also applied using an analytical model of a steering system. The input was steering wheel torque, and outputs included the road wheel angles at the steer axle, which were then fed into a commercial vehicle dynamics model providing the vehicle dynamics behavior along with feedback required for the steering model (e.g., king pin moments). Tire loads and slip angles were also provided by the vehicle dynamics model and used as input to a tire model predicting tire force and moment behavior. The related metrics were subsequently computed and compared to the measured results. Effects of the different tire sets on steering characteristics were seen from both the objective and simulation tests. Seven performance metrics were applied in a ranking comparison between measured and modeled results. Correlation of the modeled to measured metrics ranged from R2 values of 0.40 to 0.99 for the seven metrics considered.

Design of an Optimal Control Strategy for an Active Front Steering System

2006 ◽  
Author(s):  
Avesta Goodarzi ◽  
Ebrahim Esmailzadeh ◽  
Babak Nadarkhani
Keyword(s):  
Optimal Control ◽  
Vehicle Dynamics ◽  
Steering System ◽  
Lateral Acceleration ◽  
Manufacturing Companies ◽  
Vehicle Dynamic ◽  
Steering Control ◽  
Optimal Control Strategy ◽  
Active Front Steering ◽  
Innovative System

The concept of active steering control (ASC) has been considered by several researchers as well as auto manufacturing companies during recent years. This innovative system permits any correction of the driver’s steering angle in order to achieve the desired vehicle dynamic behavior. An optimal control law to evaluate the steering angle’s correction of the front wheels, being part of an active front steering system (AFS), has been developed. For this purpose a specific lateral vehicle dynamics index is defined in which way that the minimization of the performance index lead to improved vehicle dynamics. The optimal values of the control law’s gains are determined analytically. The performance of the proposed control system has been verified using 8-DOF nonlinear vehicle dynamic model. The simulation results illustrate that considerable improvement in vehicle handling is achieved particularly for the cases of the low and mid-range lateral acceleration maneuvers.

Research on Test and Simulation of New Type Steering System for Construction Machinery

2012 ◽  
Vol 241-244 ◽  
pp. 1974-1977
Author(s):  
Li Ying Ma ◽  
Nai Xing Liang ◽  
Yuan Wen Cao ◽  
Shao Xiong Gui
Keyword(s):  
System Simulation ◽  
Steering System ◽  
Testing System ◽  
Hydraulic Control ◽  
Paper Briefly ◽  
Construction Machinery ◽  
Test Platform ◽  
New Type ◽  
Turning Radius ◽  
Hydraulic Control System

This paper briefly analyzed the steering principle and electro-hydraulic control system of four wheel steering (4WS) test platform for construction machinery, and then performed a series of tests in various steering conditions. The experimental data acquisition, processing and analysis were achieved by the testing system so that transfer function of the system has been determined. And then with MATLAB/SIMULINK software the system simulation was given out. The results show that the turning radius of 4WS decreases about 20% than that of traditional two wheel steering (2WS). What’s more, the steering stability of 4WS is greatly improved. The result of this paper has certain theoretical value and good application prospect.

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