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Method for Measuring and Analyzing Transient Powertrain Vibrations of Hybrid Electric Vehicles on an Acoustic Roller Test Bench

IPEK at KIT Karlsruhe-Albert Albers, Fabian Schille, Matthias Behrendt
Published 2016-06-15 by SAE International in United States
In terms of customer requirements, driving comfort is an important evaluation criterion. Regarding hybrid electric vehicles (HEVs), maneuver-based measurements are necessary to analyze this comfort characteristic [1]. Such measurements can be performed on acoustic roller test benches, yielding time efficient and reproducible results. Due to full hybrid vehicles’ various operation modes, new noise and vibration phenomena can occur. The Noise Vibration Harshness (NVH) performance of such vehicles can be influenced by transient powertrain vibrations e.g. by the starting and stopping of the internal combustion engine in different driving conditions.The paper at hand shows a methodical procedure to measure and analyze the NVH of HEVs in different driving conditions. In order to investigate the influence of noise and vibrations by restarting and stopping the internal combustion engine (ICE) (like switching between electric and hybrid driving or the start-stop function) on the driver, acoustic and vibration measurements are performed inside the vehicle. A binaural artificial head is used to examine the acoustic effects on the vehicle interior noise. The vibration behavior is analyzed using acceleration sensors at…
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Methods for Measuring, Analyzing and Predicting the Dynamic Torque of an Electric Drive Used in an Automotive Drivetrain

SAE International Journal of Alternative Powertrains

Daimler AG-Dirk Lieske
IPEK-Albert Albers, Jan Fischer, Matthias Behrendt
  • Journal Article
  • 2015-01-2363
Published 2015-06-15 by SAE International in United States
The driving comfort is an important factor for buying decisions. For the interior noise of battery electric vehicles (BEV) high frequency tonal orders are characteristic. They can for example be caused by the gearbox or the electric drive and strongly influence the perception and rating of the interior noise by the customer.In this contribution methods for measuring, analyzing and predicting the excitation by the dynamic torque of the electric drive are presented. The dynamic torque of the electric drive up to 3.5 kHz is measured on a component test bench with the help of high frequency, high precision torque transducer. The analysis of the results for the order of interest shows a good correlation with the acoustic measurements inside the corresponding vehicle. In addition an experimental and numerical modal analysis of the rotor of the electric drive are performed. The torsional resonance modes are put into context of the elevation of the dynamic torque with regard to the frequency. In a further analysis the phase shifts of the torsional excitation of the different rotor segments,…
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Maneuver-Based Analysis of Starting-Systems and Starting-Strategies for the Internal Combustion Engine in Full Hybrid Electric Vehicles

SAE International Journal of Alternative Powertrains

BMW Group-Heidelinde Holzer, Wolfram Bohne
IPEK - Inst. of Product Engineering, KIT-Albert Albers, Kevin Matros, Matthias Behrendt, Johannes Henschel
  • Journal Article
  • 2014-01-2901
Published 2014-10-13 by SAE International in United States
The requirement of the start of the internal combustion engine (ICE) not only at vehicle standstill is new for full hybrid electric vehicles in comparison to conventional vehicles. However, the customer will not accept any deterioration with respect to dynamics and comfort. ICE-starting-systems and -strategies have to be designed to meet those demands.Within this research, a method was developed which allows a reproducible maneuver-based analysis of ICE-starts. In the first step, a maneuver catalogue including a customer-oriented maneuver program with appropriate analysis criteria was defined. Afterwards, the maneuvers were implemented and verified in a special test bench environment. Based on the method, two sample hybrid vehicles were benchmarked according to the maneuver catalogue.The benchmarking results demonstrate important dependencies between the criteria-based assessment of ICE-starts and the embedded ICE-starting-system and -strategy. Those findings led to recommendations regarding the selection of suitable starting-systems and the design of the starting-strategy.
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Approach for Parameter Determination for Objective Comfort Evaluation of the Vehicle Vibration Induced by Powertrain

Daimler AG-Rui Cai, Rainer Spengler, Christian Olfens
Karlsruhe Institute of Technology-Albert Albers, Matthias Behrendt
Published 2014-06-30 by SAE International in United States
The driving comfort influences the customer purchase decision; hence it is an important aspect for the vehicle development. To better quantify the comfort level and reduce the experiment costs in the development process, the subjective comfort assessment by test drivers is nowadays more and more replaced by the objective comfort evaluation. Hereby the vibration comfort is described by scalar objective characteristic parameters that correlate with the subjective assessments. The correlation analysis requires the assessments and measurements at different vehicle vibration. To determine the objective parameters regarding the powertrain excitations, most experiments in the previous studies were carried out in several test vehicles with different powertrain units. Due to the different features among test vehicles, the subjective assessments and the objective measurements are influenced by further interfering factors, such as different wheel excitations between vehicles, which lead to an inevitable variance.This paper presents a new approach for determination of the objective parameters for vehicle vibrations caused by powertrain. This approach is performed in a real vehicle on the vehicle roller test bench. By using various measures…
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Method for Measuring and Analyzing the Transfer Path of Acoustic Phenomena into the Driver Cabin of a Battery Electric Vehicle

SAE International Journal of Engines

IPEK - Institut für Produktentwicklung-Albert Albers, Jan Fischer, David Landes, Matthias Behrendt
  • Journal Article
  • 2014-01-2071
Published 2014-06-30 by SAE International in United States
The driving comfort is an important factor for buying decisions. Especially for battery electric vehicles (BEV) the acoustic quality is an elementary distinguishing feature, since the masking of an internal combustion engine (ICE) is no longer present. Opposing the importance of the acoustic quality is the lack of knowledge of how to measure and interpret the high frequency noise generated by an electric powertrain with respect to the NVH behavior influencing the passengers [1, 2].In this contribution a method for measuring and interpreting the transfer path of acoustic phenomena from the drivetrain of a battery electric vehicle into the passenger cabin is presented. Due to the lack of masking by the ICE in case of BEV, high frequency phenomena must be considered as well.In order to determine the airborne transfer function from the electric powertrain to the driver cabin, a dodecahedral speaker is used for reciprocal measurements. Therefore in a first step, the sound power and the emission characteristic of the dodecahedron is investigated in a novel approach by laser scanning vibrometry and by measurements…
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