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1

Evaluation of the use of hybrid electric powertrain system in urban traffic conditions

Szumska Emilia, Jurecki Rafał, Pawełczyk Marek

Eksploatacja i Niezawodność

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2020

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Vol. 22, no. 1

154--160

EN

The conditions of use of the vehicle significantly affect the performance results. Traffic conditions in a specific city directly affect the consumption of energy, fuel and emissions of harmful compounds in exhaust fumes. Conduction of the measurements of a vehicle’s performance parameters in operating conditions is very troublesome and is often not possible to realize. An alternative is to use the simulation programs. Vehicle simulation programs offer options related to vehicle models or drive unit components and allow development of new models. Based on the results of simulation testing, it is possible to analyse the level of fuel and energy consumption as well as emissions of harmful compounds in exhaust gases and the operating effectiveness of the drive system in the speed profile. The paper presents the evaluation of the effectiveness of using hybrid electric drive system in passenger cars in medium-sized city traffic conditions using the Kielce example. The simulation tests were based on the speed profiles recorded during real-world test drives in various times of the day. The simulation results were used to conduct an analysis of fuel consumption and pollutant emissions recorded by conventional and hybrid vehicles.

PL

Warunki użytkowania pojazdu mają znaczący wpływ na parametry eksploatacyjne pojazdu. Warunki ruchu w określonym mieście bezpośrednio wpływają na zużycie energii, paliwa i poziom emisji szkodliwych związków zawartych w spalinach. Przeprowadzenie pomiarów parametrów eksploatacyjnych pojazdu w warunkach rzeczywistych jest kłopotliwe i często niemożliwe do zrealizowania. Alternatywą jest wykorzystanie symulacji komputerowych. Programy do symulacji pojazdów oferują, między innymi, modele pojazdów lub komponentów układu napędowego oraz pozwalają na opracowanie nowych modeli. Na podstawie wyników badań symulacyjnych możliwa jest analiza poziomu zużycia paliwa, energii, emisji szkodliwych związków zawartych w spalinach oraz efektywności pracy układu napędowego w profilu prędkości. W niniejszej pracy przedstawiono ocenę efektywności zastosowania napędów hybrydowych w samochodach osobowych w warunkach ruchu miasta średniej wielkości na przykładzie Kielc. Do badań symulacyjnych wykorzystano profile prędkości, zarejestrowane podczas rzeczywistych przejazdów w różnych porach dnia. Na podstawie wyników symulacji przeprowadzono analizę zużycia paliwa oraz emisji zanieczyszczeń, zarejestrowanych dla pojazd z napędem konwencjonalnym oraz pojazdów z napędem hybrydowym.

2

The impact of drive mode of a hybrid drive system on the energy flow indicators in the RDE test

Fluder K., Pielecha I., Cieślik W.

Combustion Engines

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2018

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R. 57, nr 4

18--25

EN

The drive to reduce fuel consumption of vehicles equipped with internal combustion engines leads to an increasing share of hybrid drives used in various means of transport. Such hybrid vehicles, thanks to the use of diesel-electric drive systems, allow for a fuel consumption reduction, and thus to reduce the carbon dioxide emissions. This fuel consumption reduction results from a specifically selected energy flow strategy in hybrid systems. This strategy was the focus of the research performed in order to identify the energy flow conditions in a hybrid drive system in driving conditions corresponding to the RDE test. A Lexus LS 500h vehicle was tested in two drive modes, while determining the related energy flow conditions, including the operating conditions of: electric motors, internal combustion engine and battery. Energy balance was determined taking into account the high voltage battery discharge and charging energy as well as the energy recovered during regenerative braking. It was found that in the RDE test conditions the vehicle is in electric mode for over 30% of the distance and 35% of the drive time, with the energy balance of the vehicle being positive (SOCend > SOCstart). Additionally, it was pointed out that the time spent in the electric mode when driving in urban conditions is about 50% and decreases to about 15% for highway conditions.

3

Analysis of energy management strategies for hybrid electric vehicles in urban driving conditions

Pielecha I., Cieślik W., Fluder K.

Combustion Engines

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2018

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R. 57, nr 2

14--18

EN

The pursuit of fuel consumption reduction by vehicles leads to a sudden increase in the share of hybrid and electric drives in the vehicle market. Replacing hybrid vehicles with electric vehicles requires long-term technological solutions, both for the infrastructure and the vehicles themselves. Therefore, one of the leading types of passenger car drives is currently the hybrid drive. The generated work share of electric drives used to power hybrid vehicles is a determinant of the viability of using electric drives. The article estimates the operating time share of electric and hybrid modes operation in real driving conditions (RDC) based on the latest Toyota hybrid model. The research object was a vehicle from the crossover group equipped with a fourth generation hybrid drive. Analysis of the drive's operation allowed to determine the conditions of energy flow and determine the work share of the electric drive in the total driving time.