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Viewing 1 to 30 of 4141
2016-11-07 ...
  • November 7-9, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Increased public pressure to improve commercial truck safety and new stopping distance regulations have intensified the need to better understand the factors influencing heavy vehicle braking performance. To assist individuals and their organizations in preparing for these new truck braking standards, this seminar focuses attendees on understanding medium-duty hydraulic brake systems and heavy-duty air brake systems and how both systems' performance can be predicted, maintained and optimized.
2016-09-29 ...
  • September 29, 2016 (8:30 a.m. - 4:30 p.m.) - Scottsdale, Arizona
Training / Education Classroom Seminars
The choice of brake friction materials varies per application, but each must have the appropriate coefficient of friction and be able to disperse large amounts of heat without adversely effecting braking performance. This seminar will provide an introduction to brake lining raw materials and formulation, manufacturing, quality control and testing. The course covers the critical elements that must be reviewed before arriving at a lining selection decision. Different classes of friction material and their use will be defined.
2016-05-23 ...
  • May 23-25, 2016 (8:00 a.m. - 5:00 p.m.) - Greer, South Carolina
  • November 14-16, 2016 (8:00 a.m. - 5:00 p.m.) - Greer, South Carolina
Training / Education Classroom Seminars
While a variety of new engineering methods are becoming available to assist in creating optimal vehicle designs, subjective evaluation of vehicle behavior is still a vital tool to deliver desired braking, handling, and other dynamic response characteristics. In order to better prepare today’s engineer for this task, this course offers twelve modules devoted to key the fundamental principles associated with longitudinal and lateral vehicle dynamics.
2016-04-27 ...
  • April 27-29, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • November 2-4, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Hydraulic brake systems, one of the most important safety features on many road vehicles today, must meet manufacturer and customer requirements in addition to Federal Motor Vehicle Safety Standards. This course will analyze automotive braking from a system's perspective, emphasizing legal requirements as well as performance expectations such as pedal feel, stopping distance, fade and thermal management. Calculations necessary to predict brake balance and key system sizing variables that contribute to performance will be discussed.
2016-04-18 ...
  • April 18-19, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • October 13-14, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Once reserved for high-end luxury vehicles, electronic brake control systems are now required standard equipment on even the most inexpensive cars and trucks. Today, nearly every new vehicle benefits from the optimized braking, enhanced acceleration, or improved stability that these systems provide. This comprehensive seminar introduces participants to the system-level design considerations, vehicle interface requirements, and inevitable performance compromises that must be addressed when implementing these technologies. The seminar begins by defining the tire-road interface and analyzing fundamental vehicle dynamics.
2016-04-14
Event
Focusing on vehicle ride comfort, such as studies on ride evaluation and suspension tuning, occupant biomechanics and seating dynamics, semi-active and active suspension systems and vehicle elastomeric component modeling and tuning. Specific topics include, but not limited to, vehicle ride motion smoothness and control balancing, structural shake, impact harshness and after shake, brake judder/pulsation, smooth road shake/shimmy/nibble, power hop, launch shudder, freeway hop and any other phenomena affecting ride comfort.
2016-04-11 ...
  • April 11, 2016 (8:30 a.m. - 4:30 p.m.) - Detroit, Michigan
  • September 29, 2016 (8:30 a.m. - 4:30 p.m.) - Scottsdale, Arizona
Training / Education Classroom Seminars
Brake Noise, Vibration, and Harshness (NVH) is recognized as one of the major problems currently faced by the automotive manufacturers and their suppliers, with customers warranty claims of more than $100 million per year for each manufacturer. With increasing consumer braking performance expectations, automotive OEM’s and suppliers need the ability to predict potential problems and identify solutions during the design phase before millions of dollars have been spent in design, prototyping, and manufacturing tooling.
2016-04-05
Technical Paper
2016-01-0442
Xing Xu, Zou Nannan
Interconnected air suspension system can change vehicle’s operation characteristics by exchanging gas of air springs. In this paper, we analyze the structure and working principle of interconnected air suspension based on thermodynamics and vehicle dynamics. Then air suspension’s mathematical model including interconnected characteristics is established to study gas exchange principle of air suspension system. Interconnected pipeline parameters and excitation phase differences’ influence on characteristics of air suspension system in whole vehicle are calculated and analyzed. Simulation results show that the stiffness of air suspension is reduced when air springs of suspension system interconnected, as well as it decreases gradually with the increase of interconnected pipeline diameter; the stiffness of air springs is minimum if the excitation phase difference of both sides of air springs is 180 degree.
2016-04-05
Technical Paper
2016-01-1647
Jing Li, Xiong Yang, Hui Miao, Zheng Tang Shi
A program of integrated braking control system is proposed, and its structural composition and working principle is analyzed. According to the structural and mechanical characteristics of all key components, through some reasonable assumptions and simplifications, a motor, a brake master cylinder, four brake cylinders, solenoid valves and ESC algorithm models are set up based on the Matlab/Simulink software. Finally, after the assembly of each sub-model is complete and combining a vehicle which is set up in a carsim software environment, simulation tests and comprehensive performance analysis of the active safety stability control for a vehicle in double lane change and single lane change situations is carried out respectively.
2016-04-05
Technical Paper
2016-01-1628
Gurdeep Singh Pahwa, Baskar Anthonysamy, Karan shah
Lateral Stability is a major concern for Pick – Up segment vehicle. The high yaw rate or tail sway reduces the confidence of the driver during the lane change manoeuvre. The concept architecture of vehicle plays an important role to produce the stable vehicle. High yaw rate or tail sway during cornering were reported during proto vehicle validation. Tested vehicle configuration was Double Wish Bone Suspension with antiroll bar in front and rear rigid axle suspension with leaf spring anti-roll bar. The feedback was critically analysed on the vehicle with the simulation of field conditions. Since the vehicle was still under validation team, solution for the feedback required was quick and within boundary condition (maximum possible allowable limits of modification) of no major change in the suspension design as it was affects homologation cycle.
2016-04-05
Technical Paper
2016-01-1451
Mingyang Chen, Xichan Zhu, Zhixiong Ma, Lin Li
In china there are many mixed driving roads which cause a lot of safety problems between vehicles and pedalcyclists. Research on driver behavior under risk scenarios with pedalcyclist is relatively few. Driver brake parameters under naturalistic driving are studied in this paper. Brake reaction time and maximum brake jerk are used to evaluate driver brake reaction speed. Average deceleration is used to evaluate the effect of driver brake operation. Maximum deceleration is used to evaluate driver braking ability. Driver behaviors collected in China are classified and risk scenarios with pedalcyclist are obtained. Driver brake parameters are extracted and statistical characteristics of driver brake parameters are obtained. Influence factors are analyzed with univariate ANOVA and regression analysis. The results show that driver brake parameters under risk scenarios with pedalcyclist obey log-normal distribution.
2016-04-05
Technical Paper
2016-01-0014
Shun Yang, Weiwen Deng, Haizhen Liu, Rui He, Lei Qian, Wenlong Sun, Ji Gao
Nowadays, the vehicle market puts forward urgent requirement for new kinds of braking booster because the traditional vacuum booster cannot meet the demands of new energy vehicles anymore. However, one problem that all the new plans should face is how to guarantee an ideal pedal feeling. In this paper, a novel mechatronics braking booster is proposed, and servo motor introduced into the booster makes the assist rate can be adjusted under a great degrees of freedom, so the structural parameters and control parameters of the booster should be determined elaborately to get an optimal pedal feeling. The pedal feeling is always represented by the pedal stoke-force curve which is influenced by different parameters.
2016-04-05
Technical Paper
2016-01-0452
Tingyou Ming, Weiwen Deng, Sumin Zhang, Bing Zhu
In this paper, a model predictive control-based trajectory tracking scheme utilizing steering wheel and braking or acceleration pedal was proposed for intelligent vehicle. The control objective is to track a desired trajectory which obtained from the trajectory plan level. The proposed control approach is based on a simplified third-order vehicle model, which consists of a longitudinal vehicle dynamic model and a bicycle model, and a nonlinear model predictive control (NMPC) problem is formulated to best follow a given path by controlling the front steering angle, brake and traction, while fulfilling various physical and design constraints. In order to reduce the computational burden, the NMPC problem is converted to a linear time-varying (LTV) MPC based on successive online linearization of the nonlinear system model. Two different test conditions have been used to verify the effectiveness of the proposed approaches through simulations using Matlab and Carsim.
2016-04-05
Technical Paper
2016-01-0455
Hongyu Zheng, Jinghuan hu, Shuo yang
With the development of auto industry and electronic control technology, the automobile steering system is developing to the intelligent direction. Steering system is turning from traditional machinery or hydraulic steering system to the electronic control steering such as electronic power steering, active front wheel steering, steer-by-wire system and so on. Steer-by-wire system removes the mechanical structure between steering wheel and steering vehicle wheel and uses electric signal to realize the steering intention of driver. Steer-by-wire technology makes the vehicle can be controlled not only by steering wheel but also by the joystick, button, touch screen and so on.
2016-04-05
Technical Paper
2016-01-0460
Salem A. Haggag, Abraham Mansouri PhD
The control of automotive braking systems performance and wheel slip is a challenging problem due to the nonlinear of the braking process, vehicle body dynamics during braking and the tire-road interaction. When the wheel slip is not between the optimal limits during braking, the desired tire-friction force cannot be achieved, which influences the braking distance, the loss in steerability and maneuverability of the vehicle. A simple and in the same time realistic vehicle longitudinal braking model is essential for such challenging problem. In this paper, a new longitudinal rolling/braking lumped-vehicle model that takes vehicle aerodynamic forces in consideration is presented. The proposed model takes the rolling resistance force, the braking force and the aerodynamic lift and drag forces in consideration and investigates their impact on the vehicle longitudinal dynamics especially vehicle braking stopping distance and time.
2016-04-05
Technical Paper
2016-01-0092
Stijn Kerst, Barys Shyrokau, Edward Holweg
Active safety systems can be made more efficient, more robust and less complex if wheel load information would be available. This data can be obtained via different methods as for instance wheel force transducers or ‘smart tyres’. Both approaches however have difficulties related to usage in active vehicle dynamics control. The first approach, based on strain measurements in the rim, is too expensive for series application whilst the latter, based on accelerometers inside the tire, suffers from difficulties regarding its estimation bandwidth. In this paper a novel approach for the determination of wheel loading is proposed. The novel approach, based on strain measurements on the surface of the bearing outer-ring, is tested on both a dedicated bearing test setup as well as on a test vehicle. As a case study, a pure load based Anti-lock Braking algorithm is tested, which demonstrates that the novel approach provides the accuracy and bandwidth needed for active vehicle dynamics control.
2016-04-05
Technical Paper
2016-01-0453
Yingxiao Xu, Xuexun Guo, Gangfeng Tan, Jiawei Li, Yongchi Zhou, Yangjie Ji, LiWen Yu
Eddy current retarder(ECR) shares a large domestic market of auxiliary brakes in China, but shortcomings of the short continuous braking time and the high additional energy consumption are also obvious. The propose of combined braking partakes the braking torque of ECR, while the existing serial-parallel braking strategy can't balance the relationship between the braking stability and the efficiency of energy recovery well. This research puts forward an energy management strategy of combined braking system which aims to maximize energy recovery while ensure the brake stability. The motor speed, braking request and the state of charge(SoC) of storage module are analyzed synthetically to calculate the reasonable braking torque distribution proportion. And the recovered energy is priority for braking unit to reduce the additional energy consumption in this strategy.
2016-04-05
Technical Paper
2016-01-0458
Jiawei Li, Gangfeng Tan, Yangjie Ji, Yongchi Zhou, Ziang Liu, Yingxiao Xu
This paper proposed a novel concept of Integrated Energy-recuperation retarder (IEER). Facing the conventional eddy current retarders’ (ECR) braking torque attenuation under high speed domain and the poor braking property of the regenerative brake (RGB) in low speed domain, the IEER is designed to take the advantages of both the ECR and the RGB to overcome their disadvantages. The IEER integrates the rotary eddy current retarder (RECR) and the RGB, both of which share a stator. Slots are grooved on the stator of the IEER, and armature-windings are inserted in slots. Poles are arranged on the rotator. Eddy currents are excited in the stator core, and the current is excited in the armature-windings. Braking torque of the IEER produced by stator core and armature-windings can stack together, and therefore the IEER can provide greater braking torque than the RECR. Besides, the IEER can recover electric energy from armature-windings.
2016-04-05
Technical Paper
2016-01-0439
Tianqi Lv, Peijun Xu, Yunqing Zhang
The powertrain mounting system plays a very important role in controlling the NVH performance of a vehicle. The simulation analysis of powertrain mounting system adopts the linear rotation approximation model based on the premise of powertrain with small rotation angle assumption, but in some extreme loading conditions, powertrain will happen larger angle rotation, so the approximate model calculation results will be inaccurate, the calculation results of inaccurate is likely to cause powertrain interferes with the surrounding parts. This paper build a calculation model of powertrain rigid body dynamics with consideration nonlinear stiffness of the mount, and through the Newton-Raphson's iterative algorithm to solve the displacement and loads of mount system.
2016-04-05
Technical Paper
2016-01-0093
Haizhen Liu, Rui He, Jian Wu, Wenlong Sun, Bing Zhu
With the development of modern vehicle chassis control systems, such as Anti-skid Brake System (ABS) , Electronic Stability Control (ESC), and regenerative braking system(RBS) for EVs, etc., there comes a new requirement for the vehicle brake system, that is the precise control of the wheel brake pressure. The electro-hydraulic brake system (EHB), which has a ability to adjust four wheels’ brake pressure independently, can be a good match with these systems. However, the tranditional control logic of EHB is based on the PWM (Pulse-Width Modulation), which has a low control accuracy of linear electromagnetic valves. Therefore, this paper will do a research of the linear electro-magnetic valve characteristic analysis, and make a compensation control of linear electro-magnetic valves, at last, achieve the popes of precise pressure control of the EHB system.
2016-04-05
Technical Paper
2016-01-1309
Yingping Lv, Yongchang Du, Yujian Wang
In this paper, analysis methods for brake squeal including substructure modal composition analysis and substructure modal parameters sensitivity analysis are presented. The methods are based on a new closed-loop coupling disc break model, where the coupled nodal pairs in each coupling interface are connected tightly. This assumption is different from other existing models in literatures, where the interface nodes are coupled through assumed springs. Based on this new model, two analysis methods are derived. Substructure modal composition analysis indicates the contribution of modes of each substructure to the noise mode. Substructure modal parameters sensitivity analysis calculates the sensitivity of each component’s modal frequencies and shape coefficients to the real part of eigenvalues. Finally, the presented analysis methods are applied to analysis a high frequency squeal problem of a squealing disc brake.
2016-04-05
Technical Paper
2016-01-0463
Juan Sierra, Camilo Cruz, Luis Munoz, Santiago Avila, Elkin Espitia, Jaime Rodriguez
Brake systems are strongly related with safety of vehicles. Therefore a reliable design of the brake system is critical as vehicles operate in a wide range of environmental conditions, fulfilling different security requirements. Particularly, countries with mountainous geography expose vehicles to aggressive variations in altitude and road grade. These variations affect the performance of the brake system. In order to study how these changes affect the brake system, two approaches were considered. The first approach was centered on the development of an analytical model for the longitudinal dynamics of the vehicle during braking maneuvers. This model was developed at system-level, considering the whole vehicle. This allowed the understanding of the relation between the braking force and the altitude and road grade, for different fixed deceleration requirement scenarios. The second approach was focused on the characterization of the vacuum servo operation.
2016-04-05
Technical Paper
2016-01-0440
Li Jie, Wang Wenzhu, Gao Xiong, Zhang Zhenwei
The heavy truck often moves in a poor, long-distance and high-speed freight state environment, so drivers are easy to fatigue and goods are easily damaged. At the same time, compared to the passenger car, the ride comfort of heavy trucks has a lot of room for improvement. Therefore, the research on the ride comfort of heavy trucks becomes crucial.Based the elastic theory of Euler-Bernoulli beam with both free ends, a 6 DOF half rigid-elastic vibration model of the vertical dynamic response is developed, which is more suitable to the actual movement of heavy trucks. The DOFs include: vertical displacements of the body and each of two axles; the pitch displacement of the body; the first and second order bending displacements of the body. The root mean square values of body acceleration, dynamic deflections and relative dynamic loads act as evaluation index.
2016-04-05
Technical Paper
2016-01-0132
Haizhen Liu, Weiwen Deng, Rui He, Jian Wu, Bing Zhu
Brake-by-wire (BBW) system has drawn a great attention in recent years as driven by rapidly increasing demands on both active brake controls for intelligent vehicles and regenerative braking controls for electric vehicles. However, unlike conversional brake systems, the reliability of the brake-by-wire systems remains to be challenging due to its lack of physical connection in case system failure. A four-wheeled vehicle is typically an over-actuated system, as it has more actuators than the number of degrees to be controlled in vehicle yaw plane (longitudinal, lateral and yaw motion). Control allocation method has often been utilized as a means for fault-tolerant control. A great deal of researches has been done on fault-tolerant control based on control allocation method. There are basically two methods in fault-tolerant control: an optimization-based approach and a rule-based approach.
2016-04-05
Technical Paper
2016-01-0134
Sagar Behere, Xinhai Zhang, Viacheslav Izosimov, Martin Törngren
Heavy commercial vehicles constitute the dominant form of inland freight transport. There is a strong interest in making such vehicles autonomous (self-driving), in order to improve safety and the economics of fleet operation. Autonomy concerns affect a number of key systems within the vehicle. One such key system is brakes, which need to remain continuously available throughout vehicle operation. This paper presents a fail-operational functional brake architecture for autonomous heavy commercial vehicles. The architecture is based on a reconfiguration of the existing brake systems in a typical vehicle, in order to attain dynamic, diversified redundancy along with desired brake performance. Specifically, the parking brake is modified to act as a secondary brake with capabilities for monitoring and intervention of the primary brake system.
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