A Low NVH Range-Extender Application with a Small V-2 Engine - Based on a New Vibration Compensation System

Pischinger, Martin; Tomazic, Dean; Wittek, Karsten; Esch, Hans-Joachim; Köhler, Eduard; Baehr, Moritz

doi:10.4271/2012-32-0081

Cited by 8 publications

(3 citation statements)

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“…It was also concluded that a specially engineered air charging system is needed to achieve this power density and that an afterburner-supported turbocharger system could meet this requirement. Other studies have also investigated the use of two-stroke engines for similar purposes [10][11][12][15][16][17][18] but have not focused on single-cylinder applications. Because it was shown that the desired power density could be obtained, simulations were performed to investigate the performance of an upscaled 425 cc engine delivering the 150 kW power output desired for HD REX applications [18].…”

Section: Can the Burex Challenge The More Traditional Rex?mentioning

confidence: 99%

Evaluation of a Back-up Range Extender and Other Heavy-Duty BEV-Supporting Systems

Zander

Svens

Svärd

et al. 2022

WEVJ

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Electric powertrains in terms of battery electric vehicles (BEV) are considered to be very interesting for heavy truck transportations. The challenge is the need for very large onboard energy and batteries. Long-term fuel cells (FCs) are considered an interesting support system for heavy-duty BEV, but in the short term, a range extender (REX) is also interesting. A heavy-duty BEV with 970 kWh batteries installed can handle 27% of all possible missions for the Scania fleet considering daily recharging. The back-up range extender (BUREX) can expand this figure to 55% utilized 20 days per year. If a customer has a few very energy-demanding use cases each year and does not want to pay for all the batteries needed, the BUREX may be an especially good option. The BUREX reduces life-cycle CO2 emissions, irrespective of the generation mix of the grid supplying the electricity used in vehicle manufacturing and battery charging. The BUREX reuse of the existing electric components of the BEV powertrain enables the installation of a 10% larger battery pack while being 80% less costly. The BUREX also adds redundancy to the BEV concept while recharging infrastructure improves, especially in rural places. These results indicate that the BUREX concept is a powerful short-term solution that could enable greater use of HD FC and BEV trucks while charging infrastructure and FC technologies gradually become more mature.

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Section: Can the Burex Challenge The More Traditional Rex?mentioning

confidence: 99%

Evaluation of a Back-up Range Extender and Other Heavy-Duty BEV-Supporting Systems

Zander

Svens

Svärd

et al. 2022

WEVJ

View full text Add to dashboard Cite

show abstract

“…There is a need for experimental investigations due to the structure and load change to determine auxiliary power unit (APU) performances with specific NVH characteristics, especially to achieve low NVH applications [27][28][29]. In this study, the NVH performance of the internal combustion engine was evaluated first as single-cylinder engines work noisily.…”

Section: Design Of Range-extended Vehicle and Energy-management Systemmentioning

confidence: 99%

Estimation of Energy Management Strategy Using Neural-Network-Based Surrogate Model for Range Extended Vehicle

et al. 2022

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In this paper, an energy-management strategy based on fuel economy is presented to achieve a further range increase for range-extended light commercial vehicles. Estimation of the energy-management strategy was carried out using a neural-network-based surrogate model for an range-extended vehicle. Surrogate-based optimization plays an important role in optimization problems, which are based on complex structures with uncertainties in data sets due to various conditions. Neural networks have advantages in creating surrogate-based models in cases of complex problems with uncertainties in data sets to evaluate the process and estimate the outputs. This study discusses additional power-unit applications and vehicle integration for a light commercial electric vehicle. It provides preliminary design work and techniques for identifying NVH problems in particular. SIMULINK and neural-network-based surrogate models are established, and the changeable parameters of the vehicle, such as mass, battery/fuel-tank capacity, internal combustion engine power and electric motor power units are simulated in different dynamic and static conditions to determine an energy-management strategy for a range-extended vehicle based on fuel economy under various conditions. It was seen that APU parameters and an energy-management strategy significantly affected the fuel consumption of REX. A neural-network-based surrogate-model approach gave high-precision results in predicting the operating strategy according to different loading conditions to reduce fuel consumption. In some cases, it can be required to determine the fuel consumption results in various conditions with the variables, which may be out-of-boundary conditions. It was seen that the proposed neural-network-model also offers higher prediction ability in cases of unexpected results in data sets of various conditions compared to regression analysis. The results show that estimation and optimization of energy management using a neural-network-based surrogate model can be achieved by adapting the operating strategy according to different loading conditions to reduce fuel consumption. This study presents an approach for future new vehicle projects by transforming a prototype light commercial electric vehicle to REX. The proposed approach was developed to design the most efficient range-extended vehicle by changing all variables without costly computations and time-consuming analysis. It is possible to generate variable data sets and to have reference knowledge for future vehicle projects.

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“…Rust and Graf 10 studied the noise issues of a Wankel engine used in an ReEV and focused on the design of the isolation system and the intakeexhaust system of the APU. Various range extenders with emphasis on the NVH performance [11][12][13][14][15][16] are under development.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the noise, vibration and harshness performances of a range-extended electric vehicle

Guo

Cao

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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The electrification of vehicles has caused a great change in the characteristics of noise, vibration and harshness. A rangeextended electric vehicle has complicated noise and vibration problems because it behaves both like a traditional vehicle and like a battery electric vehicle as well as having its own specific noise, vibration and harshness properties. Therefore, increasing attention should be paid to these issues. This paper is intended as a contribution to the current research on the noise, vibration and harshness of a range-extended electric vehicle. The electric driveline, the auxiliary power unit and the accessories, including the power steering pump, the electric vacuum pump and the air conditioner compressor, are tested and their noise, vibration and harshness performances are analysed. The results indicate that the highfrequency noise of the electric driveline and the vibrations of the auxiliary power unit and the air conditioner compressor are crucial noise, vibration and harshness issues of a range-extended electric vehicle. Some improvement methods are implemented or proposed for better comfort in the passenger compartment. Application of a material which is sound insulating and sound absorbing proved to be an effective countermeasure. The design and refinement of a vibration isolation system for the auxiliary power unit and the air conditioner compressor are of great importance. A reduction in the low-frequency torsional resonance of the auxiliary power unit shaft during a start-stop process is a new problem compared with that of a conventional engine. It is necessary to find a well-balanced compromise between the expected acoustic feedback and the power demand.

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A Low NVH Range-Extender Application with a Small V-2 Engine - Based on a New Vibration Compensation System

Cited by 8 publications

References 0 publications

Evaluation of a Back-up Range Extender and Other Heavy-Duty BEV-Supporting Systems

Evaluation of a Back-up Range Extender and Other Heavy-Duty BEV-Supporting Systems

Estimation of Energy Management Strategy Using Neural-Network-Based Surrogate Model for Range Extended Vehicle

Experimental investigation of the noise, vibration and harshness performances of a range-extended electric vehicle

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