Wyniki wyszukiwania - BazTech

1

Integration of capacitors with carbon-lignin based electrodes in rail vehicles for enhanced energy efficiency

Kurc Beata, Woźniak Krystian, Rymaniak Łukasz, Szymlet Natalia

Pojazdy Szynowe

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2023

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Nr 3-4

33--39

EN

The article presents considerations regarding the possibility of recovering braking energy of a rail vehicle. The energy parameters obtained during acceleration and braking of the loaded railbus were taken as input data. It was found that over 13 kWh of energy was lost irretrievably in the braking resistors. Due to the speed of the discussed process, capacitors with an original design were proposed for energy recovery. For the purposes of this study, electrodes were fabricated using carbon derived from lignin carbonization at two distinct temperatures: 900°C and 1000°C. Based on the electrochemical tests carried out, it was found that the second proposed solution achieves a significantly better power-to-weight ratio – 13 kW/kg.

2

Impact of the driver behaviour on the energy recuperation in an electric vehicle

Skarbek-Żabkin A., Szczepański T.

Journal of KONES

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2018

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Vol. 25, No. 1

355--362

EN

In recent years, energy recuperation systems have been used more and more often. This is due to the rapid development of electric and hybrid cars. In view of the growing technology that allows for a recuperation system efficiency increase, it is important to consider whether the weakest link is in this case not the driver and his ability to customize the driving style to the needs of energy recovery. This article attempts to answer this question. For that purpose, the special road tests were conducted in a real urban traffic. Two drivers were involved, each of whom used alternating recovery and non-recovery driving style. In total twelve road tests, realisations have been completed. The results of the measurements were entered into a mathematical model that simulated the work of the energy recuperation system. It allowed estimating how different recovery systems can work in the conditions of conducted tests. On this basis, an analysis was made both in terms of the total amount of energy that can be recovered in the case of recuperative and non-recuperative driving, and analysis of the recuperation system working and the real impact of the driver's driving style on the energy stored in the car's battery. Basis on the conducted considerations authors noted that use of recuperative driving technique could increase the amount of stored braking energy on average by 60%. It was also seen a significant impact on the energy waveform in the battery.

3

Impact of the road conditions on the amount of braking energy

Szczepański T., Skarbek-Żabkin A., Dziedziak P.

Combustion Engines

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2017

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R. 56, nr 4

265--268

EN

The issue of energy recuperation is increasingly found in modern cars (both electric and hybrid, as well as powered by a combustion engine only). Road conditions are one of the essential factors determining the appropriateness of using certain design solutions in braking energy recovery systems. This article presents an analysis of road conditions prevailing in a large urban agglomeration together with an evaluation of their usefulness for utilizing the braking energy. Road tests were carried out for this purpose, and their analysis used the Monte Carlo method to determine the pseudo-accidental courses.

4

Podstacje trakcyjne prądu stałego z rekuperacją energii hamowania pojazdów

Drozdowski P., Duda A.

TTS Technika Transportu Szynowego

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2016

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R. 23, nr 11

39--43

PL

W niniejszym artykule zaprezentowano układy przekształtnikowe podstacji trakcyjnych z rekuperacją energii hamowania odzyskowego pojazdów, tj. układ podstawowy z impulsowym falownikiem rekuperacyjnym, w pełni sterowany układ z prostownikiem tyrystorowym i falownikiem impulsowym, układ z mostkiem tyrystorowym pracującym jako falownik i szeregowymi tyrystorami odcinającymi oraz układ z mostkiem tyrystorowym pracującym jako falownik i równoległymi tyrystorami odcinającymi. Wskazano na wady i zalety omawianych rozwiązań oraz przedstawiono metoda uproszczonego obliczenia bilansu energetycznego jazdy i hamowania odzyskowego pojazdu.

EN

The DC traction substations are usually composed of the 3-phase transformer and the output diodę rectifier. So, such deWces do not allow for energy recuperation from the DC side to AC 3-phase mains. The energy recuperation is demanded for regenerative braking of traction drives with pulse converters (inverters for induction motors and choppers for DC motors). In this paper four technical solutions (Fig. 4) allowing for braking energy recuperation are discussed. This can be considered as the modemisation of the existing traction substations in the railway and the municipal traction. Such solutions indicate for three profits: energy recuperation, mechanical brakes saving and enhanced ąuality of traction vehicle control. The proposed converters are compared indicating indMdual advantages and draw-backs. Additionally the method ofsimplified calculation of energy balance of consumed and recuperated energy in the traction network has been presented in Chapter 2.

5

Examining the braking energy recovery in a vehicle with a hybrid drive system

Gajek A., Strzępek P.

Archiwum Motoryzacji

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2015

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Vol. 68, no. 2

49--60, 159--170

EN

Results of examining the braking energy recovery in a passenger car with a hybrid system driving the front wheels have been presented. The tests were carried out on a vehicle with a series-parallel system, which combined an internal combustion engine with an electric motor. Such a system makes it possible to change the electric motor operation mode so that it becomes a generator, which charges a high-voltage battery with the use of the vehicle braking energy. The battery charging current was measured at braking with various vehicle deceleration values. The algorithm of controlling the battery charging current, the share of the energy recovered in the total braking energy, and the power of the regenerative braking in relation to the total braking power demand were analysed. The instantaneous power demand at braking on a horizontal road with a low rolling resistance coefficient was determined. The share of the electric power in the energy balance of the braking process as well as the demand and recovery of energy during this process were examined.

PL

W artykule przedstawiono wyniki badań odzysku energii hamowania osobowego samochodu o napędzie hybrydowym kół przednich. Badaniom poddano pojazd z szeregowo równoległym, spalinowo-elektrycznym, hybrydowym układem napędowym. Układ ten umożliwia zamianę rodzaju pracy silnika elektrycznego na pracę prądnicową i ładowanie baterii wysokonapięciowej z wykorzystaniem energii hamowania. Wykonano pomiary prądu ładowania baterii podczas hamowania przy różnych opóźnieniach ruchu pojazdu. Przeanalizowano algorytm sterowania prądem ładowania, udział energii odzyskanej w stosunku do całkowitej energii hamowania oraz moc hamowania odzyskowego w stosunku do całkowitego zapotrzebowania mocy hamowania. Przedstawiono chwilowe zapotrzebowanie mocy przy hamowaniu na jezdni poziomej o niewielkim współczynniku oporów toczenia. Przebadano udział mocy elektrycznej w bilansie energetycznym hamowania oraz zapotrzebowanie i odzysk energii podczas procesu hamowania.

6

Badania eksperymentalne i symulacyjne odzysku energii hamowania w hydrobusie

Pawelski Z., Wittich S., Pałczyński T.

Archiwum Motoryzacji

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2007

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Nr 4

389-397

PL

Celem zaprezentowanych badań odzysku energii hamowania było poznanie możliwości badanego, hybrydowego układu napędowego oraz zaproponowanie parametrów pracy układu przy uzyskaniu możliwie niskiego zużycia paliwa i niskiej toksyczności spalin. Istotnym zagadnieniem prowadzonych badań było zidentyfikowanie fragmentu zaproponowanego modelu układu napędowego związanego z odzyskiem energii hamowania. W efekcie przeprowadzonych badań otrzymano przebiegi wielkości charakterystycznych dla omawianego procesu, które pozwoliły zaproponować parametry jego realizacji i zidentyfikować przyjęty do badań model.

EN

The aim of presented research of breaking energy recuperation was to discover performances of hybrid power transmission and to propose as optimal as possible work parameters for control system. Parallel to this was important to achieve low fuel consumption and reduce emission of pollutants. Important case was also to identify proposed mathematical model of the drive system part which is connected with breaking energy recuperation. The effects of conducted research were courses of characteristic quantities for the process which let to propose optimal parameters of its realization and to identify proposed model.