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Influence of the Tire Inflation Pressure Variation on Braking Efficiency and Driving Comfort of Full Electric Vehicle with Continuous Anti-Lock Braking System

SAE International Journal of Passenger Cars - Mechanical Systems

Ilmenau University of Technology-Dzmitry Savitski, Kristian Hoepping, Valentin Ivanov, Klaus Augsburg
  • Journal Article
  • 2015-01-0643
Published 2015-04-14 by SAE International in United States
The presented study demonstrates results of experimental investigations of the anti-lock braking system (ABS) performance under variation of tire inflation pressure. This research is motivated by the fact that the changes in tire inflation pressure during the vehicle operation can distinctly affect peak value of friction coefficient, stiffness and other tire characteristics, which are influencing on the ABS performance. In particular, alteration of tire parameters can cause distortion of the ABS functions resulting in increase of the braking distance. The study is based on experimental tests performed for continuous ABS control algorithm, which was implemented to the full electric vehicle with four individual on-board electric motors. All straight-line braking tests are performed on the low-friction surface where wheels are more tended to lock. The experimental results of ABS braking clearly demonstrated impact of different tire inflation pressure levels (1.5, 2.5 and 3.5 bar) on (i) braking performance, (ii) control performance of ABS, and (iii) driving comfort during the panic braking. Conclusions are made on possible ABS adaptability and robustness improvement and its use in combination…
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Combined Testing Technique: Development of Friction Brake System for Electric Vehicle

Ilmenau University of Technology-Klaus Augsburg, Dzmitry Savitski, Lukas Heidrich, Valentin Ivanov
Published 2014-09-28 by SAE International in United States
The presented research discusses the experimental procedure developed for testing of friction brake systems installed on the modern electric vehicles. Approach of combined experimental technique utilizing hardware-in-the-loop platform and brake dynamometer is introduced. As the case study, an influence of brake lining coefficient of friction fluctuations on the anti-lock brake system (ABS) performance is investigated. The ABS algorithm is represented by the direct slip control aimed to the precise tracking of reference slip ratio by means of electric and friction brake system. Vehicle prototype is represented by RWD electric vehicle with in-wheel motors. Results, representing the investigated phenomenon, are derived using the developed combined test bench. The achieved results give a basis for further extension of standard brake testing procedures.
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Design and Testing of ABS for Electric Vehicles with Individually Controlled On-Board Motor Drives

SAE International Journal of Passenger Cars - Mechanical Systems

Ilmenau University of Technology-Valentin Ivanov, Barys Shyrokau, Dzmitry Savitski
Flanders' DRIVE-Johan Theunissen, Karel Janssen
  • Journal Article
  • 2014-01-9128
Published 2014-08-01 by SAE International in United States
The paper introduces the results of the development of anti-lock brake system (ABS) for full electric vehicle with individually controlled near-wheel motors. The braking functions in the target vehicle are realized with electro-hydraulic decoupled friction brake system and electric motors operating in a braking mode.The proposed ABS controller is based on the direct slip and velocity control and includes several main blocks for computing of predictive (feedforward) and reactive (feedback) brake torque, wheel slip observer, slip target adaptation, and the algorithm of brake blending between friction brakes and electric motors.The functionality of developed ABS has been investigated on the HIL test rig for straight-line braking manoeuvres on different surfaces with variation of initial velocity. The obtained experimental results have been compared with the operation of baseline algorithm of a hydraulic ABS and have demonstrated a marked effect in braking performance.
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Influence of Active Subsystems on Electric Vehicle Behavior and Energy Characteristics

Ilmenau University of Technology-Dzmitry Savitski
Nanyang Technological University-Barys Shyrokau, Danwei Wang
Published 2014-04-01 by SAE International in United States
Nowadays there is a tendency to implement various active vehicle subsystems in a modern vehicle to improve its stability of motion, handling, comfort and other operation characteristics. Since each vehicle subsystem has own limits to generate supporting demand, their potential impact on vehicle dynamics should be analyzed for steady-state and transient vehicle behavior. Moreover, the additional research issue is the assessment of total energy consumption and energy losses, because a stand-alone operation of each vehicle subsystem will provide different impact on vehicle dynamics and they have own energy demands.The vehicle configuration includes (i) friction brake system, (ii) individual-wheel drive electric motors, (iii) wheel steer actuators, (iv) camber angle actuators, (v) dynamic tire pressure system and (vi) actuators generating additional normal forces through external spring, damping and stabilizer forces. A passenger car is investigated using commercial software. The actuator models are defined using experimental test results and technical literature information.The selected open-loop maneuvers cover steady-state and transient vehicle behavior. Slowly Steer Increasing maneuver demonstrated that all considered subsystems have notable influence on the steering characteristic of…
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Adaptive Test System to Improve PCB Testing in the Automotive Industry

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

Ilmenau University of Technology-Steffen Ostendorff, Joerg Sachsse, Heinz-Dietrich Wuttke, Jorge Meza Escobar
  • Journal Article
  • 2013-01-1230
Published 2013-04-08 by SAE International in United States
This paper presents an adaptive test approach to improve the structural testing of printed circuit boards (PCB) found in electronic automotive components. The approach makes use of FPGAs available on the PCBs, and its applicability is supported by the global trend taking place in the automotive industry of replacing ASICs with programmable devices such as FPGAs.For structural testing of PCBs, Boundary Scan (BScan) is mostly used. However, BScan has the disadvantage of being a static test method due to the slow execution speed reducing the fault coverage concerning dynamic faults.FPGAs support BScan as well, but they also offer a vast number of programmable resources. These resources can be configured for testing purposes.Our approach is to speed-up the testing process during the PCB manufacturing by moving data intensive processing from the external software side (Test-PC) to the programmable hardware side on-board (FPGA), reducing the data transfer over the slow JTAG interface. The resources of the FPGA are used to implement a complete FPGA based test system capable of generating, applying, and analyzing test patterns at high…
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