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Real Driving Emissions Measurement of Brake Dust Particles

Technische Universitat Ilmenau-David Hesse, Klaus Augsburg
Published 2019-09-15 by SAE International in United States
The measurement of brake dust particles is a complex challenge owing to its open system configuration; indeed, the emitted particles are directly spread into the environment. Measurements on the inertia brake dyno feature controllable and reproducible environmental and operational parameters. Although Real Driving Emission (RDE) measurements enable the detection of brake dust particles emitted in real driving conditions (i.e. traffic condition, driving style, air humidity, vehicle components’ wear and ageing, etc.), they are complex and not reproducible due to external, continuously changing parameters (e.g., flow conditions, changing traffic conditions, particulate matter from other sources). The motivation lies in developing a real driving emission sampling system for brake particle emissions, which meets the quality requirements of the measurements, as well as the prevention of particle losses and contamination, thereby supplementing and reviewing laboratory-based procedures. On the basis of knowledge from the computational fluid dynamics and experimental investigations, an advantageous concept of a sampling system for mobile application is presented. The chosen methodological approach shows that the transport efficiency and the uniformity of the number concentration depend…
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Extending the Magic Formula Tire Model for Large Inflation Pressure Changes by Using Measurement Data from a Corner Module Test Rig

SAE International Journal of Passenger Cars - Mechanical Systems

Technische Universität Ilmenau-Kristian Höpping, Klaus Augsburg, Florian Büchner
  • Journal Article
  • 06-11-02-0009
Published 2018-03-05 by SAE International in United States
Since the tire inflation pressure has a significant influence on safety, comfort and environmental behavior of a vehicle, the choice of the optimal inflation pressure is always a conflict of aims. The development of a highly dynamic Tire Pressure Control System (TPCS) can reduce the conflict of minimal rolling resistance and maximal traction. To study the influence of the tire inflation pressure on longitudinal tire characteristics under laboratory conditions, an experimental sensitivity analysis is performed using a multivalent usable Corner Module Test Rig (CMTR) developed by the Automotive Engineering Group at Technische Universität Ilmenau. The test rig is designed to analyze suspension system and tire characteristics on a roller of the recently installed 4 chassis roller dynamometer. Camber angle, toe angle and wheel load can be adjusted continuously. In addition, it is possible to control the temperature of the test environment between −20 °C and +45 °C. The results of the experimental study that covers a wide range of different wheel loads and inflation pressures for three different tire variations show a significant influence of the inflation…
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Estimation of Brake Friction Coefficient for Blending Function of Base Braking Control

SAE International Journal of Passenger Cars - Mechanical Systems

Technische Universität Ilmenau-Vincenzo Ricciardi, Dzmitry Savitski, Klaus Augsburg, Valentin Ivanov
  • Journal Article
  • 2017-01-2520
Published 2017-09-17 by SAE International in United States
The brake architecture of hybrid and full electric vehicle includes the distinctive function of brake blending. Known approaches draw upon the maximum energy recuperation strategy and neglect the operation mode of friction brakes. Within this framework, an efficient control of the blending functions is demanded to compensate external disturbances induced by unpredictable variations of the pad disc friction coefficient. In addition, the control demand distribution between the conventional frictional brake system and the electric motors can incur failures that compromise the frictional braking performance and safety. However, deviation of friction coefficient value given in controller from actual one can induce undesirable deterioration of brake control functions. The main objective of the presented study is to propose a method to compensate disturbances induced by variations of brake linings friction coefficient through modifications of the brake torque demand for the enhancement of both brake performance and active safety.The achievement of a compensation mechanism requires the estimation of relevant vehicle states. Hereunto, a novel technique based on a linear Kalman observer is proposed for the online estimation of…
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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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Measures Development for Brake Dust Emissions with Computational Fluid Dynamics and Particle Imaging Velocimetry

Ilmenau Technical Univ-Klaus Augsburg, Sebastian Gramstat, Ruediger Horn, Hannes Sachse
Published 2011-09-18 by SAE International in United States
The growing awareness of health relevance of fine dust emissions beyond traditional combustion engines becomes more and more important for state of the art research activities. Already existing emission regulations, which are exclusively dedicated to combustion engines, can also be helpful to regulate brake particle emissions since they are nearly in the same range of size and distribution. Another driver is customer satisfaction like surveys such as J.D. Power are showing.It can be stated that a major reason for complaints is the elevated wheel soiling by braking-caused emissions. The major goals of research activities are the development, realization and evaluation of countermeasures dedicated to brake particle emissions. For the development of measures a possibility is shown, which allows the characterization of particle loaded flows as well as the realization of countermeasures. Therefore numerical flow simulation (CFD) is used. The existing demand of measure-oriented results allows conclusions of the particle behavior as a consequence of implemented changes like geometry or operational scenarios. Moreover it is shown how the emission behavior of different measures is evaluated. To…
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Investigation of Brake Control Using Test Rig-in-the-Loop Technique

Ilmenau Technical Univ-Klaus Augsburg, Sebastian Gramstat, Ruediger Horn, Valentin Ivanov, Hannes Sachse
Nanyang Technological University-Barys Shyrokau
Published 2011-09-18 by SAE International in United States
Research and development tools for investigations of various facets of braking processes cover three major groups of devices: Dynamometer test rigs: assessment of performance, durability, life cycle and others;Tribometer test rigs: definition of parameters of friction and wear;Hardware-in-the-loop: estimation of functional properties of controlled braking.A combination of the listed devices allows to research complex phenomena related to braking systems.The presented work discusses a novel approach of test rig fusion, namely the combination of a brake dynamometer and hardware in the loop test rig. First investigations have been done during the operation of the anti-lock braking system (ABS) system to demonstrate the functionality of the approach. This task requires the following configuration of test equipment: NVH-brake dynamometer with integrated climatic chamber;Hardware-in-the-loop test rig including dSpace controllers, hydraulic brake system, and sensors and actuators of the ABS system;Beside the introduction of the testing hardware, especially the dynamometer design layout and its operational parameters plus the hardware-in-the-loop test rig, the used control algorithms are presented. Moreover one can find the used parameters for first verification studies of the…
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Kinematic Discrepancy Minimization for AWD Terrain Vehicle Dynamics Control

Ilmenau Technical Univ-Klaus Augsburg, Barys Shyrokau, Valentin Ivanov
Lawrence Technological Univ-Vladimir Vantsevich
Published 2010-10-05 by SAE International in United States
Stability of motion, turnability, mobility and fuel consumption of all-wheel drive terrain vehicles strongly depends on engine power distribution among the front and rear driving axles and then between the left and right wheels of each axle. This paper considers kinematic discrepancy, which characterizes the difference of the theoretical velocities of the front and rear wheels, as the main factor that influences power distribution among the driving axles/wheels of vehicles with positively locked front and rear axles. The paper presents a new algorithm which enables minimization of the kinematic discrepancy factor for the improvement of AWD terrain vehicle dynamics while keeping up with minimal power losses for tire slip. Three control modes associated with gear ratio control of the front and rear driving axles are derived to provide the required change in kinematic discrepancy. Computer simulation results are presented for different scenarios of terrain and road conditions. The effectiveness of the proposed control algorithm was analytically proved by modeling the same vehicle with no kinematic discrepancy control.
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Advancement of Vehicle Dynamics Control with Monitoring the Tire Rolling Environment

SAE International Journal of Passenger Cars - Mechanical Systems

Ilmenau Technical Univ.-Valentin Ivanov, Barys Shyrokau, Klaus Augsburg, Sebastian Gramstat
  • Journal Article
  • 2010-01-0108
Published 2010-04-12 by SAE International in United States
One of the most important challenges for electronic stability control (ESC) systems is the identification and monitoring of tire rolling environment, especially actual tire-road friction parameters. The presented research considers an advanced variant of the ESC system deducing the mentioned factors based on intelligent methods as fuzzy sets. The paper includes: Overview of key issues in prototyping the algorithms of Electronic Stability Control.Case study for vehicle model.Procedures for monitoring of tire rolling environment: theoretical backgrounds, computing methods, fuzzy input and output variables, fuzzy inference systems, interface with ESC algorithm.Case study for ESC control algorithm.Examples of simulation using Hardware-in-the-Loop procedures.The proposed approach can be widely used for the next-generation of ESC devices having the close integration with Intelligent Transport Systems.
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Mojacar Brake Wear and NVH: Dyno Simulation Concept

Ford of Europe-Jaroslaw Grochowicz, Jos Ruymen
Honeywell-Harald Abendroth
Published 2007-10-07 by SAE International in United States
Efficient development and testing of brake systems requires further substitution of expensive and time consuming vehicle testing by appropriate dynamometer testing. Some of the current simulation methods do not reflect the needs of engineering and the progress made in the development of test equipment. The lack of suitable procedures may cause unexpected delays in the realization of projects.Road load simulations for lifetime prediction on brake dynamometers have a long history, however never got a real break-through in Europe - possibly because the prediction quality and efficiency did not satisfy.This paper concentrates first on the analysis of the vehicle data recorded in Mojacar (Spain) which is a sign-off test for wear and noise for brands of Ford Motor Company for European market. Specific attention is given to different types of driving resistances and road profiles and to consideration of different methods for numerical description and comparison of road load data.In its second part the paper describes possible methodologies of dynamometer simulation. A modular simulation concept is suggested, allowing wear prediction only and various combinations of wear…
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