Research Publications Authored by SLIIT Staff

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This collection includes all SLIIT staff publications presented at external conferences and published in external journals. The materials are organized by faculty to facilitate easy retrieval.

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Open Access
Comparing Fuel Consumption and Emission Levels of Hybrid Powertrain Configurations and a Conventional Powertrain in Varied Drive Cycles and Degree of Hybridization
(Белорусский национальный технический университет, 2020) Maddumage, W. U; Abeyasighe, K. Y; Perera, M. S. M; Attalage, R; Kelly, P
The use of hybrid electric transmissions in the automotive industry is a solution to the problem of emissions and fuel economy compared to conventional combustion engine vehicles. To achieve the desired results, when designing a hybrid electric vehicle, it is necessary to consider various options, while taking into account fuel consumption and exhaust emissions. The article presents an analysis of the design of an automobile transmission, various options and situations are considered, for example, the target driving cycle and the degree of hybridization. Four transmission configuration models (combustion engine, serial, parallel and complex hybrid transmission configurations) for a small vehicle (motorized three-wheeler) have been developed using Model Advisor software. The listed transmission configurations have been modeled with different driving cycles and varying degrees of hybridization. First, the impact of the vehicle's power management strategy and the performance of various transmission configurations is investigated based on the analysis of exhaust emissions and fuel consumption. Second, driving cycles are scaled according to kinetic intensity and the relationship between fuel consumption and driving cycles is estimated. Thirdly, three fuel consumption models have been developed so that the fuel consumption for an actual driving cycle can be predicted for each transmission configuration. Studies have shown that compared to a conventional transmission, fuel consumption is lower in hybrid vehicles. The tests gave an unexpected result: higher levels of CO emissions from hybrid vehicles. In addition, the fuel consumption of all four transmissions indicates a strong correlation with the kinetic intensity values of the selected driving cycles. It was found that for different driving cycles, the average fuel preference for each cycle was: 23% for sequential, 21% for parallel and 33% for complex hybrids in comparison with the transmission of an internal combustion engine. Experiments have shown that the performance of hybrid configurations varies depending on the driving cycle and degree of hybridization. The article identifies promising areas of research. It was found that for different driving cycles, the average fuel preference for each cycle was: 23% for sequential, 21% for parallel and 33% for complex hybrids in comparison with the transmission of an internal combustion engine. Experiments have shown that the performance of hybrid configurations varies depending on the driving cycle and degree of hybridization. The article identifies promising areas of research. It was found that for different driving cycles, the average fuel preference for each cycle was: 23% for sequential, 21% for parallel and 33% for complex hybrids in comparison with the transmission of an internal combustion engine. Experiments have shown that the performance of hybrid configurations varies depending on the driving cycle and degree of hybridization. The article identifies promising areas of research.
Open Access
Comparing fuel consumption and emission levels of hybrid powertrain configurations and a conventional powertrain in varied drive cycles and degree of hybridization
(Белорусский национальный технический университет, 2020) Maddumage, W. U; Abeyasighe, K. Y; Perera, M. S. M; Attalage, R, A; Kelly, P
Hybrid electric powertrains in automotive applications aim to improve emissions and fuel economy with respect to conventional internal combustion engine vehicles. Variety of design scenarios need to be addressed in designing a hybrid electric vehicle to achieve desired design objectives such as fuel consumption and exhaust gas emissions. The work in this paper presents an analysis of the design objectives for an automobile powertrain with respect to different design scenarios, i. e. target drive cycle and degree of hybridization. Toward these ends, four powertrain configuration models (i. e. internal combustion engine, series, parallel and complex hybrid powertrain configurations) of a small vehicle (motorized threewheeler) are developed using Model Advisor software and simulated with varied drive cycles and degrees of hybridization. Firstly, the impact of vehicle power control strategy and operational characteristics of the different powertrain configurations are investigated with respect to exhaust gas emissions and fuel consumption. Secondly, the drive cycles are scaled according to kinetic intensity and the relationship between fuel consumption and drive cycles is assessed. Thirdly, three fuel consumption models are developed so that fuel consumption values for a real-world drive cycle may be predicted in regard to each powertrain configuration. The results show that when compared with a conventional powertrain fuel consumption is lower in hybrid vehicles. This work led to the surprisingly result showing higher CO emission levels with hybrid vehicles. Furthermore, fuel consumption of all four powertrains showed a strong correlation with kinetic intensity values of selected drive cycles. It was found that with varied drive cycles the average fuel advantage for each was: series 23 %, parallel 21 %, and complex hybrids 33 %, compared to an IC engine powertrain. The study reveals that performance of hybrid configurations vary significantly with drive cycle and degree of hybridization. The paper also suggests future areas of study.