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John Deere India Pvt Ltd-amol pimpale, pankaj vaste, rohit pawar
John Deere India Pvt, Ltd.-Prashant Bardia
  • Technical Paper
  • 2019-28-2421
To be published on 2019-11-21 by SAE International in United States
KEYWORDS: Steering System, Engine Vibrations, Dynamics, Modal Testing, Modal Analysis, ABSTRACT - In modern agriculture, the tractor’s use is indispensable and essential for various operations like cultivation, soil preparation, pulverization and many more. However, despite being efficient machines, tractors may be subjected to different level of vibrations in various parts of their structure. The vibration often plays the key cause of invalidation and component failures and also, affecting the ride and comfort. Since it is known that such vibration factors can affect the behavior in many ways, an understanding of their dynamic response is warranted. In this paper, case study related to reduction of steering system vibration is presented. Objective and Background: Vibration reduction is linked with the reduction either at source or on path. For such, it is necessary to know the reality of machines, component and mechanisms to mitigate the vibration levels on the tractor. From the testing and analysis of the components, it is possible to calculate the dynamic properties and vibration average level. The vibration reduction decreases the damages caused by…

Modelling and validation of a Control Algorithm for Yaw stability and Body Slip Control using PID and fuzzy Logic based controllers

SITAMS-Chellappan Kavitha
VIT University-Umashankar Lath, Sanyam Kakkar, Aman Agarwal, Bragadeshwaran Ashok, Vemuluri Ramesh Babu, Sathiaseelan Denis Ashok
  • Technical Paper
  • 2019-28-0054
To be published on 2019-10-11 by SAE International in United States
Advanced driver-assistance system (ADAS) is becoming an essential part of modern commercial vehicle. At any instance Vehicle handling and stability is determined by the yaw rate and body slip of the vehicle. Active steering control with Electronic brake force distribution system can help in precise control of body slip and yaw control. In most of the existing research work on active steering, Control algorithms are based on single track vehicle (2 DOF) with a linear tire model for calculating the desired parameters. But these simplified model fails at high speed, tight corners and in case of combined tire slip as it neglect parameters like the non-linearity of tire model, Ackermann of the steering system and effect of two track on the stability of vehicle. The aim of this research work is to fill the existing research gap by incorporating all the mentioned drawback in a new control algorithm. A Full vehicle 14 DOF and 6 DOF model with a nonlinear tire model based on Pacejka’s “Magic tire formula” was made in Simulink, the two track…

Steering for Off-Road, Rubber-Tired Machines

OPTC1, Personnel Protection (General)
  • Ground Vehicle Standard
  • J1511_201907
  • Current
Published 2019-07-29 by SAE International in United States

This SAE Standard applies to off-road rubber-tired machines having rated speed capability exceeding 20 km/h.


Hot New ‘Hands-On’ Direction in ADAS Safety Research

Autonomous Vehicle Engineering: July 2019

Stuart Birch
  • Magazine Article
  • 19AVEP07_10
Published 2019-07-01 by SAE International in United States

JLR researches use of steering wheel heating and cooling to reduce driver workload

Jaguar Land Rover (JLR) recently revealed novel research into a driver-safety aid: a sensory steering wheel rim that heats or cools on each side to warn of upcoming GPS-directed maneuvers-plus serves as an extra information source in low-visibility situations.

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A Control Strategy to Reduce Torque Oscillation of the Electric Power Steering System

Concordia University Montreal-Subhash Rakheja
South China University of Technology-Duo Fu, Wen-Jun Yan, Wen-Bin Shangguan
Published 2019-06-05 by SAE International in United States
This paper proposes a new evaluation method of analyzing stability and design of a controller for an electric power steering (EPS) system. The main purpose of the EPS system’s control design is to ensure a comfortable driving experience of drivers, which mainly depends on the assist torque map. However, the high level of assist gain and its nonlinearity may cause oscillation, divergence and instability to the steering systems. Therefore, an EPS system needs to have an extra stability controller to eliminate the side effect of assist gain on system stability and attenuate the unpleasant vibration. In this paper, an accurate theoretical model is built and the method for evaluating system quality are suggested. The bench tests and vehicle experiments are carried out to verify the theoretical analysis. The evaluation method proposed in this paper can not only guide the design of controller parameters, but also evaluate the control effect while the performance of several controllers are all excellent.
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Achieving better power management by optimizing thermal management

SAE Truck & Off-Highway Engineering: June 2019

market development manager at Danfoss Power Solutions, wrote this article for Truck & Off-Highway Engineering. Becker has a diverse background in product engineering, manufacturing engineering, quality and sales in both ISO9000 (APQP framework) and AS9100 manufacturing environments.-Aaron Becker
  • Magazine Article
  • 19TOFHP06_09
Published 2019-06-01 by SAE International in United States

Four primary power transmission subsystems work together in a wheel loader: the transmission system, the work functions system, the steering system, and the thermal management system. Optimizing any one of these without considering how it impacts the rest of the machine design can result in poor vehicle performance. On the flip side, looking at the machine as one cohesive system can result in true, overall optimization.

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Aircraft Nosewheel Steering/Centering Systems

A-5B Gears, Struts and Couplings Committee
  • Aerospace Standard
  • AIR1752A
  • Current
Published 2019-04-17 by SAE International in United States
The intent of this AIR is twofold: (1) to present descriptive summary of aircraft nosewheel steering and centering systems, and (2) to provide a discussion of problems encountered and “lessons learned” by various airplane manufacturers and users. This document covers both military aircraft (land-based and ship-based) and commercial aircraft. It is intended that the document be continually updated as new aircraft and/or new “lessons learned” become available.
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Kinematics and Compliance Analysis of a 3.5 Tonne Load Capacity Independent Front Suspension for LCV

Hexagon Studio-Salih Kuris, Efe Gungor, Ataman Deniz, Gulsah Uysal, Baris Aykent
Published 2019-04-02 by SAE International in United States
This paper deals with the development of a 3.5 tonne carrying double wishbone front suspension for a low floor LCV. It is a novelty in this class of vehicles. It has a track width of 1810 mm and it has a recirculating ball steering system. The steering mechanism has been arranged so that the steering angle could reach to 48° that is a very effective angle in that vehicle range. This results as a lower turning radius which indicates a better handling for the vehicle.The steering and the front suspension system here have been optimized in terms of comfort and handling by using DOE (design of experiments) based on sequential programming technique. In order to achieve better suspension and steering system geometry, this technique has been applied. The results have been compared with the benchmark vehicle.
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Improvement of Steering Performance Using Steering Rack Force Control

Hyundai Mobis-Byoungyun Lee
Hyundai Motor Company-Chanjung Kim, Dayul Son
Published 2019-04-02 by SAE International in United States
Drivers continually require steering performance improvement, particularly in the area of feedback from the road. In this study, we develop a new electrically-assisted steering logic by 1) analyzing existing steering systems to determine key factors, 2) modeling an ideal steering system from which to obtain a desirable driver torque, 3) developing a rack force observer to faithfully represent road information and 4) building a feedback compensator to track the tuned torque. In general, the estimator uses the driver torque, assist torque and other steering system signals. However, the friction of the steering system is difficult to estimate accurately. At high speed, where steering feeling is very important, greater friction results in increased error. In order to solve this problem, we design two estimators generated from a vehicle model and a steering system model. The observer that uses two estimators can reflect various operating conditions by using the strengths of each method. Therefore, it reflects the driving situation more precisely. We evaluated real vehicle performance under various operating conditions to compare the actual rack force and…
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Design and Optimization of a Robust Active Trailer Steering System for Car-Trailer Combinations

University of Ontario Institute of Technology-Mutaz Keldani, Khizar Qureshi, Yuping He, Ramiro Liscano
Published 2019-04-02 by SAE International in United States
This paper presents a robust active trailer steering (ATS) controller for car-trailer combinations. ATS systems have been proposed and explored for improving the lateral stability and enhancing the path-following performance of car-trailer combinations. Most of the ATS controllers were designed using the linear quadratic regulator (LQR) technique. In the design of the LQR-based ATS controllers, it was assumed that all vehicle and operating parameters were constant. In reality, vehicle and operating parameters may vary, which may have an impact on the stability of the combination. For example, varied vehicle forward speed and trailer payload may impose negative impacts on the directional performance of the car-trailer combination. Thus, the robustness of the conventional LQR-based ATS controllers is questionable. To address this problem, we propose a gain-scheduling LQR-based ATS controller. In the design of the proposed ATS controller, at each operating point, the ATS controller is designed using the LQR technique. At an operating point between two established adjacent operating points, the control gain matrix of the controller is determined using an interpolation method. To further improve…
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