Criteria

Text:
Display:

Results

Viewing 241 to 270 of 1650
2007-08-05
Technical Paper
2007-01-3558
Lei Li, Changgao Xia, Wei Qin
Taking the five-link suspension of a car as the subject investigated on the basis of ADAMS/Car, this paper builds the parameterized mode of the multi-link suspension. The simulation shows the influence relations among multi-link suspension structure parameter and the wheel location parameter, wheel track, roll center. On the base of this, aim for improving the ride safety and comfort, multi-link suspension optimization model is built and carried out parameter optimization design by using ADAMS/Insight. The result shows that this method is high-performance and can be used in the design of multi-link suspension conveniently.
2007-08-05
Technical Paper
2007-01-3585
Daeyi Jung, Dohyun Jung, Changhyun Jeong, Youseok Kou, Huei Peng
The current test methods are insufficient to evaluate and ensure the safety and reliability of vehicle system for all possible dynamic situations including the worst cases such as rollover, spin-out and so on. Although the known NHTSA J-turn and Fish-hook steering maneuvers are applied for the vehicle performance assessment, they are not enough to predict other possible worst case scenarios. Therefore, it is crucial to search for the various worst cases including the existing severe steering maneuvers. This paper includes the procedure to search for other useful worst case based upon the existing worst case scenarios in terms of rollover and its application in simulation basis. The human steering angle is selected as a design variable and optimized to maximize the index function to be expressed in terms of vehicle roll angle. The obtained scenarios were enough to generate the worse cases than NHTSA ones.
2007-08-05
Technical Paper
2007-01-3586
Jianghui Xin, Shunming Li
With the aim of improving vehicle steering stability through the introduction of active steering control in obstacle avoidance, the author undertook the development of the fuzzy neural networks. By using back propagation neural network as the base, it can use fuzzy theory and neural networks together to form a fuzzy neural networks control system. So it can auto pick-up the fuzzy rule and build the subordinate function. The result of simulation analyses and experiments indicate that the method proposed in the paper can achieve safe and stability in steering control of obstacle avoidance of intelligent mobile vehicle.
2007-08-05
Technical Paper
2007-01-3587
Fen Lin, Youqun Zhao
Two soft-sensing methods which are neural network and Kalman filter for estimating vehicle side slip angle are compared. A radial basis function (RBF) neural network based soft-sensing model is proposed to estimate vehicle side slip angle in driver-vehicle closed-loop system. Vehicle side slip angle is considered as mapping of time series of yaw rate and lateral acceleration which are easily measured, the nonlinear mapping relationship of the three state parameters is established through neural network. In addition the method based on Kalman filter is also given. The results of comparison between estimation and measurement show that the neural network method proposed in this paper has higher accuracy and less computation requirement. It can provide theoretical guidance for design of estimator in vehicle stability control system.
2007-08-05
Technical Paper
2007-01-3588
D. V. Abhilash, Manjunatha Gaviappa, Venketesan Sudharshan
. This paper deals with the study of intelligent vehicle safety system. High speeds are achievable with proper design of safe road bearing vehicular components. These speeds are achieved safely, when the physical and mental conditions of the driver are stable. On the event of the driver, not taking the necessary measure to ensure the drivers safety, it is therefore important that the driver is monitored to predict his/her behavior in order to avoid mishaps. This paper explores three ways to ensure the rightness of driver's physical and mental conditions 1) Seat belts to measure the rate of breathing 2) Steering which can measure the heart beat 3) Detection of eye-lid movement
2007-08-05
Technical Paper
2007-01-3589
Hidehiko Enomoto, Kouhei Akiyama, Hirokazu Okuyama
Large truck accidents sometimes result in severe damages or give large disturbance of traffic and there are demands of improving vehicle safety characteristics. Main types of traffic accidents concerned are rear-end collision and single accident. As countermeasures for rear-end collisions, world-first collision mitigation brake for commercial vehicles; Pre-crash Safety System, was developed. If there is possibility of collision, warning to driver and brake control intervention is carried out in stepwise fashion and collision speed is decreased. To achieve higher effect in collision mitigation, it is necessary to activate warning or brake-force in earlier timing. Inter-vehicle or infrastructure-vehicle communication offer promising prospect. Tractor-trailer combinations show some instable behaviors. “Roll Stability Assist” and “Vehicle Stability Control” were developed to assist drivers to avoid the occurrence of these instable behaviors.
2007-08-05
Technical Paper
2007-01-3590
Yuta Takimoto, Pongsathorn Raksincharoensak, Masao Nagai
This paper proposes a driving torque control algorithm of micro-scale electric vehicle (NOVEL-I) at the scene of preceding vehicle following. First, an inter-vehicle distance controller aiming to keep a safe inter-vehicle distance is designed. Next, the experiments of vehicle following situation by automatic driving with the designed controller are realized and the effectiveness of the controller is verified. Next, the designed controller is applied to the human-vehicle closed-loop system as driver assistance systems, thereby enhancing driving comfort and reducing driving workload for human. Finally, the experiment of vehicle following by cooperative driving between the human and the controller is conducted. The experimental result in cooperative driving is compared with manual driving, and the effectiveness of the controller is verified.
2007-08-05
Technical Paper
2007-01-3591
Satoshi Katahira, Eiji Shibata, Tatsuhiko Monji
SUBARU has developed an advanced stereo camera system as core technology for future intelligent vehicles. The system offers higher performance in the detection of objects on the road including pedestrians as well as better accuracy and environmental resistance, which allow the system to be used in full speed range adaptive cruise control (FSR-ACC) and Pre-crash safety applications. In addition, all the processes for recognition, decision-making and operation have been integrated to improve efficiency and reduce cost.
2007-08-05
Technical Paper
2007-01-3592
Nao Saito, Setsuo Arita, Yuji Ichinose, Daisuke Shimma
Our objective in this paper is to show the feasibility of battery-line communication in an automobile in order to lighten the weight of wire harnesses. We experimentally measured the attenuation characteristic of some battery-lines. We showed a throughput of 10.2 Mbps from a cigarette lighter socket to a rear light was obtained via the battery-line by using our prototype modem with an OFDM (Orthogonal Frequency Division Multiplexing) modulation for the battery-line communication. But throughput from the cigarette lighter socket to the battery was 297 kbps because of noises generated from such apparatuses as the engine, air-conditioner and windshield wipers. We expect that it is possible to improve the throughput of battery-line communication by using some error-correcting technique.
2007-08-05
Technical Paper
2007-01-3594
Weigao Qiao, Xicheng Wang
Based on the multi-body system, the work research the injury index of the mathematics models of pedestrian, by simulating the motion of the pedestrian impacted by vehicle using MADYMO. Compared with the article published, verify the dependability of this simulated test. Based on the dependability, Carry on sensitivity analysis to design parameter of the automobile. Research on the pedestrian protection by the vehicle by revising the sensitive design parameter. By simulating the pedestrian impacted by the vehicle which installing the hood raise structure, search on the injury index. Compared with the original injury index, we can find that the hood raise structure be propitious to the pedestrian.
2007-08-05
Technical Paper
2007-01-3596
WU Li-jun, WANG Jian-qiang, LI Sheng-bo
A HIL simulator for developing vehicle adaptive cruise control systems is presented in this paper. The xPC target is used to establish real-time simulation environment. The simulator is composed of a virtual vehicle model, real components of an ACC system like ECU, electronic throttle and braking modulator, a user interface to facilitate simulation, and brake and accelerator pedals to make interactive driver inputs easier. The vehicle model is validated against data from field test. Tests of an ACC controller in the real-time are conducted on the simulator.
2007-08-05
Technical Paper
2007-01-3560
Jihwan Kim, Hyeongcheol Lee
This paper presents a model based sensor fault detection and isolation algorithm for the vertical acceleration sensors of the Continuous Damping Control (CDC) system, installed on the sprung mass. Since sensor faults of CDC system have a critical influence on the ride performance as well as the vehicle stability, the sensor fault detection algorithm must be implemented into the overall CDC algorithm. In this paper, each vertical acceleration sensor installed on the sprung mass (two in the front corners and one in the rear) separately estimates the vertical acceleration of the center of gravity of the sprung mass. Then, the sensor fault is detected by cross-checking all three vertical acceleration estimates independently obtained by the each vertical acceleration sensor.
2007-08-05
Technical Paper
2007-01-3563
Shin-Ae Lee, Byung-Hak Kwak
Vehicle stability control system can enhance the vehicle stability and handling in emergency situation through the control of traction and braking forces at the individual wheels. In order to achieve the desired performance, we must exactly calculate compensated yaw moment, and control the wheel slip rate to generate braking force. However, the yaw moment is highly dependent on the status of tire dynamics at each wheel. In this study, we propose optimal yaw moment distribution controller based on tire model according to the normal forces, the road condition, the slip rate and the slip angle to cope with nonlinear tire dynamics. The proposed controller for distributing the desired tire slip rate makes used of the optimization technique based on the tire nonlinear model. It minimizes the braking control force corresponding to the desired tire slip at each wheel.
2007-08-05
Technical Paper
2007-01-3562
Balamurugan Janarthanam, Samir K. Ghodekar, Amol A. Apte
Abstract It is customary to select a twist beam rear suspension for front wheel driven small and medium range passenger cars. Besides better primary / secondary ride comfort, roll stiffness tuning ability, ease of assembly & good packaging solutions than the conventional semi trailing arm/ rigid axle suspensions, twist beam suspension system accentuate the concentration required in placing & orienting the cross beam to achieve certain imperative kinematical characteristics. In order to make the solutions of the required kinematical targets viable, it is vital to have the packaging space and stress concentration within yield limits given the weight & cost targets. This paper presents the work done on twist beam type suspension for a new generation entry level B-Class hatchback vehicle developed. To reduce the time consumed in validation of different design proposals a virtual validation process was developed.
2007-08-05
Technical Paper
2007-01-3568
N. White, P. E. Brandon
This paper explores the relationship between the damper and its mounting and outlines objective techniques that would aid product development and benchmarking accuracy. One of the outcomes is an improved damper test waveform and better post processing techniques that provide a variety of metrics.
2007-08-05
Technical Paper
2007-01-3572
Cao Youqiang, Luo Hong, Deng Zhaoxiang, Lai Fei
The influences among the weight number of object function, maximum value of suspension optimum control force and suspension performance are analyzed in this paper. A total state feedback controller for the 7-degree-freedoms modal of total vehicle based on random optimum control strategy is built. By ADAMS &MATLAB \simulink co-simulation, the influence of weight number of object function on maximum value of suspension control force and suspension performance is discussed in the paper. It obtains the relations among maximum value of suspension optimum control force, suspension performance and the variety of weight number Then a set of weight number which are applied to the object function of optimum control for the car are selected at last.
2007-08-05
Technical Paper
2007-01-3566
Young-Joo Cho, Byung-Hak Kwak
Because of an increasing popularity of the SUV and Light Truck with an elevated center of gravity, the rollover propensity is higher than before. This paper proposes a method to detect and prevent an impending rollover of the vehicle using Electronic Stability Control(ESC). The Rollover Prevention(ROP) function determines a rollover critical situations based on the rollover propensity index and generates a proper activation through a brake and engine intervention. The rollover propensity index is calculated from the relative distance of the trajectory to the threshold on the phase plane of roll-angle and roll-rate. The threshold on the phase plane is deduced from the conservation of energy in the roll model. For the detection and activation of continuous rollover phenomena, we use the TTL concept that presents a gradually increasing rollover propensity. The proposed algorithm in this paper is shown to be effective in mitigating a rollover through the simulation and vehicle test.
2007-08-05
Technical Paper
2007-01-3570
Tang Xinpeng, Duan Xiaocheng
A virtual sport utility vehicle (SUV) model is built by using ADAMS/Car. The model is simplied with 95 DOFs equipped with active anti-roll bars in front and rear suspension. A fuzzy tunning PID controller using roll angle input source is applied in the active roll control. It is co-simulated under the Matlab/Simulink software environment and realizes the online coordination. The simulation results show that this controller has the ability of self-adjusting and decreases the body roll angle effectively. The vehicle riding comfort is ensured and the vehicle directional stability is improved.
2007-08-05
Technical Paper
2007-01-3574
Tianjun Zhu, Changfu Zong, Hongyu Zheng, Chengwei Tian, Hongyan Zheng
This paper sets up a simplified dynamic model for simulating the yaw/roll stability of heavy tractor-semitrailer using Matlab/Simulink. A linear quadratic regulator (LQR) based on partial-state feedback controller is used to optimize the roll stability of the vehicle. The control objective for optimizing roll stability is to be reducing the lateral load transfer rate while keeping the suspension angle less than the maximum allowable angle. The simulation result shows that the LQR controller is effective in the active roll stability control of the heavy tractor-semitrailer.
2007-08-05
Technical Paper
2007-01-3573
Mai Li, Zong Changfu, Pan Zhao, Jiang Xiangping
With the development of the auto industry, the automobile manufacturers demand to shorten development period and reduce the cost. Compared with the traditional method, applying the virtual prototype is more economical. This paper presents a method for parameters sensitivity analysis and optimizing the performance of vehicle handling. The considered design parameters include suspension design parameters (the compliance parameters such as the stiffness of the spring, the kinematic parameters such as the coordinates of hard points in front, rear suspensions etc.), steering system design parameters (the inertia of steering wheel, the ratio of steering gear etc.), and operating parameters (the inertia and the coordinates of the center of the sprung mass, etc.). Finally the handling performances of the new designed vehicle are simulated by using the full vehicle ADAMS model.
2007-08-05
Technical Paper
2007-01-3578
Kwangho Yoo, Ahra Lee, Taedong Ahn, Deog-kyoon Jeong, Dong-il “Dan” Cho
This paper describes our development work for acceleration sensing modules for electronic stability program (ESP) applications. The accelerometer is fabricated using the unique sacrificial/bulk micromachining (SBM) process by us. The sensing modules are designed to measure low level accelerations accurately and be stable in an automotive environment. This paper describes the accelerometer design and fabrication, electronic circuits and PCB design, module assembly, and performances of the developed sensing module. The developed sensing module offers analog voltage output with ±1.5g dynamic range, 0.05% nonlinearity, >50Hz bandwidth and 1295mV/g scale factor. The module includes a CAN2.0A interface and yields good experimental performance when implemented on a CAN test server.
2007-08-05
Technical Paper
2007-01-3575
Changfu Zong, Hsiao Hsiang Na, Dan Hu, Deping Wang, Botao Yue
This paper presents a study on steering effort preference of Chinese drivers based on ADSL Driving Simulator. The results of the simulation test demonstrates that Chinese drivers' steering effort preference increases with vehicle speed, which is similar to European and Japanese drivers', but the mean preference effort level itself is lower than that of European and Japanese drivers' and this same steering effort preference increases obviously with lateral acceleration in linear region (lateral acceleration level lower than 0.3g) while not as evidently in nonlinear region (lateral acceleration level higher than 0.3g).
2007-08-05
Technical Paper
2007-01-3580
Daesik Kim, Sungwoo Kim, Hyungjin Kim, Bongsoo Son
The “Road Safety Information System(RSIS)” addressed in this paper differs from those active and real time systems in that it controls an artificial counter force at the active accelerator pedal before the vehicle actually enters the curve to limit the cornering speed. This study aims at detecting the dangerous section on the road and warning of entering the curve. To determine dangerous section, the quality and accuracy of Digital Road Map(DRM) is very important to calculate the curve fitting on the road. The curve detection algorithm and software, which were suggested by in this paper, with effective determination were designed and developed. As a result of the research, when this method were used to find curve section it showed similar results and performances between a highway and national road.
2007-08-05
Technical Paper
2007-01-3584
Kihan Noh, Daeyi Jung, Hyungjeen Choi, Kyoungsu Yi
It is significant to consider human factors for the design of the intelligent safety vehicle beyond the general vehicle's performance. Therefore, the development of an ergonomic driver model to imitate the human driving pattern is essential for the advanced vehicle research considering the human factors. In this paper, several tests for the study of the human factors are conducted, and the control logic to describe the human driving pattern is presented. First of all, human factors to influence a vehicle operation are assumed to be consisted of two major components, the preview distance and the human neuromuscular response. Secondly, the control logic is consisted of the finite preview optimal control algorithm to account for human factors mentioned previously. Finally, the ergonomic driver model is developed based on these and simulated with Carsim software in SIMULINK environment.
2007-08-05
Technical Paper
2007-01-3579
Dongho Shin, Sungbo Sim, Jaehoon Ryu, Jaekwan Lee, Insik Lee
This paper mainly focuses on a lateral control law for pre-given path following which is developed by using the backstepping control design methodology. The position information of the vehicle is obtained by Real Time Kinematic DGPS, and the yaw rate and side-slip angle used in controller are estimated by Kalman estimator. To show the performance of the proposed controller under different speed and various path curvature conditions, the results are given through experiments which are executed on proving ground especially designed for high maneuvering test of which minimum radius of curvature is about 60 m.
2007-08-05
Technical Paper
2007-01-3582
Tae-Kyung Moon, Seong-Hee Jeong, Jun-Nam Oh
In this paper, we study the trend of research on inter-vehicle communication and implement to a simple control system. This system detects opposite vehicles approaching from invisible areas to the driver, and determine how much risky to the own car. When the risk level is high, it slow downs the vehicle to prevent collision. Finally, we derive key technological issues necessary to develop control system with communication integrated.
2007-08-05
Technical Paper
2007-01-3748
JoyantaKumar Chakrabarty
During endurance tests on new prototypes, it is often observed that test drivers come back with some feed back on clutch slippage. This is a typical example of subjective evaluation and at times it is found that it is the test driver's perception rather than the actual clutch slippage. To over come this problem, a new method has been evolved which captures the clutch slippage automatically and quantify that to the minutest details. This is achieved using GPS based instrumentation and software for automatic detection. This system is part of intelligent control which using the GPS determines the actual speed of the vehicle and also acquires the engine speed through RPM sensor which is converted into vehicle speed. Using a dedicated software program, variation in actual speed and calculated speed provides the information on clutch slippage along with the gear shift pattern during test driving.
2007-08-05
Technical Paper
2007-01-3561
Youngho Park, Jihwan Kim, Hyeong-cheol Lee
The paper presents a new offset compensation method of a yaw rate sensor and a lateral acceleration sensor. It is necessary to compensate the offsets of the analog sensors, such as the yaw rate sensor and the lateral acceleration sensor, to acquire accurate signals. This paper proposes two different offset compensation algorithms, the sequential compensation method and the model based compensation method. Both algorithms are combined with the algorithm map depending on the vehicle driving status. The proposed algorithm is verified by the computer simulations.
2007-07-23
Technical Paper
2007-01-2066
Hu Li, Gordon E Andrews, Adnan A Khan, Dimitrios Savvidis, Basil Daham, Margaret Bell, James Tate, Karl Ropkins
A FTIR in-vehicle on-road emission measurement system was installed in a EURO 2 emissions compliant SI car to investigate exhaust emissions under different urban traffic conditions. The real time fuel consumption and vehicle traveling speed was measured and logged. The temperatures were measured along the exhaust pipe so as to monitor the thermal characteristics and efficiency of the catalyst. Two real world driving cycles were developed with different traffic conditions. One (WP cycle) was located in a quiet area with few traffic interference and the other one (HPL cycle) was in a busy area with more traffic variations. The test car was pre-warmed before each test to eliminate cold start effect. The driving parameters were analyzed for two real world cycles. The WP cycle had higher acceleration rate, longer acceleration mode and shorter steady speed driving mode and thus harsher than the HPL cycle.
2007-05-15
Technical Paper
2007-01-2255
Paul R. Donavan
Typically, the noise emission from trucks under highway cruise conditions is not reduced as much as it is for light vehicles when quieter pavements are used. Potential reasons for this are that other noise sources beside tire/pavement noise are more significant for trucks than light vehicles and/or the effect of pavement on truck tire noise generation is different than it is for light vehicle. As the cruising passby noise levels of trucks are about 10 dB greater than for light vehicles, this becomes an important issue for highway noise abatement when trucks make up even a relatively small percentage of the traffic flow. To investigate this issue, beam forming and conventional passby testing methods were used to investigate the contribution of both tire/pavement noise and the other noise sources for common types of heavy trucks.
Viewing 241 to 270 of 1650