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Sliding Mode Controlled Half Car Suspension System with Magnetorheological Damper

Anna University-AROCKIA SUTHAN SOOSAIRAJ, ARUNACHALAM K
  • Technical Paper
  • 2020-01-1540
To be published on 2020-06-03 by SAE International in United States
Attenuation of vibrations caused by the road undulance conditions are tedious and very much related to human health and vehicle handling problems. One of the promised approaches to solving these problems in a vehicle suspension system is the use of effective controllers. In this paper, the sliding mode controller (SMC) is designed and used to control the magnetorheological (MR) damper. The performance of the proposed controller is verified by incorporating the controller in a half car vehicle suspension model. In a suspension damper design, Modified Bouc-Wen model is used to characterize the hysteretic behaviour of MR damper parameters. The voltage control algorithm is used to convert the desired force into the varied voltage input to the MR damper. The fail-proof advantage of MR damper is analysed by comparing the results of uncontrolled MR suspension with a passive system. In order to limit the pitch angle and to achieve the improved ride comfort and stability of the vehicle, the vertical displacement of the front and rear body of the half-car model is controlled by the SMC…
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Autonomous Lane Change Control Using Proportional-Integral-Derivative Controller and Bicycle Model

Kettering University-Ajinkya A. Joshi, Diane L. Peters, Jennifer M. Bastiaan
  • Technical Paper
  • 2020-01-0215
To be published on 2020-04-14 by SAE International in United States
As advanced vehicle controls and autonomy become mainstream in the automotive industry, the need to employ traditional mathematical models and control strategies arises for the purpose of simulating autonomous vehicle handling maneuvers. This study focuses on lane change maneuvers for autonomous vehicles driving at low speeds. The lane change methodology uses PID (Proportional-Integral-Derivative) controller to command the steering wheel angle, based on the yaw motion and lateral displacement of the vehicle. The controller was developed and tested on a bicycle model of an electric vehicle (a Chevrolet Bolt 2017), with the implementation done in MATLAB/Simulink. This simple mathematical model was chosen in order to limit computational demands, while still being capable of simulating a smooth lane change maneuver under the direction of the car’s mission planning module at modest levels of lateral acceleration. The simulation indicated that the lane change control system performed well for low speeds and at moderate steering wheel angles. After the simulation phase, the model was converted to implementable vehicle code and integrated into a vehicle for on-road testing of obstacle…
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Study on Impact of SUV chassis stiffness on vehicle dynamics through CAE

Mahindra & Mahindra Ltd.-Visweswara Lenka, Baskar Anthonysamy, BALARAMAKRISHNA N, Abhijit Londhe
  • Technical Paper
  • 2020-01-1004
To be published on 2020-04-14 by SAE International in United States
Now a day’s automotive industry is a highly competitive market where continuous innovation in design and production of vehicles is required to gain market share and survive in the market. This resulted in the reduction of the life cycle of the design process and design tools. Identifying, understanding and refining these details is significant to develop sustainable cars. Body and Chassis stiffness are important specifications of a passenger car which affects handling, steering and ride characteristics of the vehicle. It has been proved that torsional, lateral and local chassis stiffness can play a role in giving the customer a premium feeling by affecting key metrics in the vehicle dynamics behaviour of a passenger car. In this paper, the effect of chassis stiffness on vehicle dynamics performance is studied using CAE. Different attributes of vehicle dynamics like vehicle handling, On-Center feel and vehicle ride are considered as performance characteristics. The chassis stiffness is varied by varying the material characteristics and evaluated the different performance attributes. It has been found the chassis stiffness influenced differently on On-center…
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A Study on the Effect of Tire Temperature and Rolling Speed on the Vehicle Handling Response

Eindhoven University of Technology-Abhijeet Behera
Siemens Digital Industries Software-Carlo Lugaro, Mohsen Alirezaei, Ioannis Konstantinou
  • Technical Paper
  • 2020-01-1235
To be published on 2020-04-14 by SAE International in United States
Rubber is a non-linear viscoelastic material which properties depend upon several factors. In a tire two of these factors, namely the temperature and excitation frequency, are significantly influenced by the vehicle operating conditions. In the past years, applied research studied how rubber viscoelastic characteristics affect structural and frictional tire properties. The present study focuses on how these effects interact with the vehicle handling response. Based on state of the art theory of friction, structural properties of rubber and on experimental evidence, the dependency of key tire parameters on temperature and rolling speed is established. These results are then used in combination with a single-track vehicle model to assess their impact on key vehicle parameters; as an example, the understeer coefficient, yaw resonance peak / damping and maximum acceleration are studied. Furthermore, to ensure accurate results in realistic situations, a novel tire thermodynamic model is used in combination with a detailed 14 degrees of freedom vehicle model in a numerical simulation environment. The simulations permit to study the mutual effects between tire temperature, rolling speed and…
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A Tire Work Load (TWL) Based Controller for Active Independent Front Steering System (AIFS)

Helwan University-Mohab Bahnasy, Mahmoud Atef Aly, Walid Oraby
  • Technical Paper
  • 2020-01-0648
To be published on 2020-04-14 by SAE International in United States
Vehicle Handling performance depends on many parameters. One of the most important parameters is the dynamic behavior of the steering system. However, steering system had been enhanced thoroughly over the past decade where Active Front Steering (AFS) is now present and other system as Active Independent Front Steering (AIFS) is currently in the research phase. Actually, AFS system adopt the front wheels’ angles base on the actual input steering angle from the driver according to vehicle handling dynamics performance. While, the AIFS controls the angle of each front wheel individually to avoid reaching the saturation limits of any of the front wheels’ adhesion. In this paper modeling and analysis of an AIFS is presented with Tire Work Load (TWL) based controller. Magic Formula tire model is implemented to represent the tire in lateral slip condition. A specially derived 3-DOF vehicle handling model longitudinal, lateral and yaw motion with four wheels is capable for studying AIFS implementing proposed control strategy. AIFS system is proposed to implement two main control strategies, which are PI controller only for…
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Straight Motion of Road Vehicles

Alessandro Lattuada, Giampiero Mastinu, Giuseppe Matrascia
  • Book
  • R-496
Published 2020-03-31 by SAE International in United States

Straight Motion of Road Vehicles explores the straight motion of road vehicles with particular focus on the role played by tires, vehicle suspensions, and road cross slope. The authors consider vehicles currently in production as well as automated vehicles, which are likely to become more prevalent in the future. This work will lead to the production of safer, smarter, and more comfortable vehicles, enabling engineering solutions for vehicles that naturally run straight ahead, saving fuel and minimizing tire wear.

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Performance Requirements for Determining Tow-Vehicle Gross Combination Weight Rating and Trailer Weight Rating

Tow Vehicle Trailer Rating Committee
  • Ground Vehicle Standard
  • J2807_202002
  • Current
Published 2020-02-13 by SAE International in United States
This document establishes minimum performance criteria at GCWR and calculation methodology to determine tow-vehicle TWR for passenger cars, multipurpose passenger vehicles, and trucks. This includes all vehicles up to 14000 pounds GVWR.
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New Integrated Vehicle Dynamics Control System Based on the Coordination of AFS, DYC, and ED for Improvements in Vehicle Handling and Stability

SAE International Journal of Vehicle Dynamics, Stability, and NVH

University of Saida, Algeria-Norediene Aouadj, Kada Hartani, Mekri Fatiha
  • Journal Article
  • 10-04-02-0009
Published 2020-01-27 by SAE International in United States
An integrated vehicle dynamics control system aiming to improve vehicle handling and stability by coordinating active front steering (AFS), direct yaw control (DYC), and electric differential system is developed in this article. First, an electric differential system for electric vehicle, composed of two sets of bi-PMS, in-wheel motors connected in parallel and supplied by a single five-leg inverter, one on the front axle and one on the rear axle, is designed. However, each set is controlled by a proposed sliding mode backstepping control, which has replaced the hysteresis controllers in the conventional direct torque control (DTC), can obviously reduce the torque ripple, and provide better speed tracking performance using sliding mode speed controllers. Second, an integrated control system which coordinates AFS and DYC braking system is designed by using a stability index, based on stability domain in the phase plane portrait, and a gain scheduling parameter to improve vehicle steerability and maintain vehicle stability during extreme driving situations. Simulation results confirm the effectiveness of the proposed integrated vehicle dynamics control system and the overall improvements…
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Study of Handling Behavior of a Passenger Vehicle after Addition of CNG Tank

Maruti Suzuki India, Ltd.-Lakshmi Narasimha Varma Jelli, Raghav Budhiraja, Akash Goel, Deepak Bakshi, Rakesh K
  • Technical Paper
  • 2019-28-2405
Published 2019-11-21 by SAE International in United States
The objective of this paper is to study the change in handling behaviour of the dual-fuel vehicle fitted with a CNG tank to that of its single fuel (gasoline) counterpart. A validated CarSim model is run through steady state and transient state handling tests before and after the addition of CNG tank. The simulation results are used to compare the handling characteristics of the CNG vehicle with the reference vehicle. Further based on these results the suspension parameters are changed to find an optimum set-up for the actual CNG vehicle.
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Evaluating Effects of Roll Stiffness Change at Front and Rear Axles on Vehicle Maneuverability and Stability

Maruti Suzuki India, Ltd.-Eric Pranesh Reuben, Raghav Budhiraja, Sreeraj N, Rakesh K, Amardeep Singh
  • Technical Paper
  • 2019-28-2406
Published 2019-11-21 by SAE International in United States
To cater the push towards “Vehicle Light Weighting”, both sprung and unsprung mass are being reduced. This results in reduced stiffness and thus has a profound undesirable effect on the overall vehicle handling. To understand the effect of different reduction ratios of sprung to unsprung mass; it is desired to understand how changes in stiffness affect the overall vehicle handling characteristics. Therefore, the study was conducted to experiment with different values of roll stiffness, at both front and rear axles and comparing the frequency response and phase change of Yaw Gain observed through a Pulse Input test. The present work is further correlated with subjective feedback to predict the shift in vehicle balance and handling characteristics.
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