Development of capacitor hybrid system for urban buses

Sasaki, Masakazu; Araki, Shuuichi; Miyata, Tatsuji; Kawaji, Takayuki

doi:10.1016/s0389-4304(02)00227-8

Cited by 19 publications

(5 citation statements)

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“…The three concepts can always be combined with an energy storage inside the vehicle. Hybrid and fuel cell buses have for example energy storages for the recovery of braking energy [3][4][5]. The energy storage in hybrid buses can also be used for a partial emission free operation [6,7].…”

Section: Introductionmentioning

confidence: 99%

Fast Charging Battery Buses for the Electrification of Urban Public Transport—A Feasibility Study Focusing on Charging Infrastructure and Energy Storage Requirements

2015

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Abstract:The electrification of public transport bus networks can be carried out utilizing different technological solutions, like trolley, battery or fuel cell buses. The purpose of this paper is to analyze how and to what extent existing bus networks can be electrified with fast charging battery buses. The so called opportunity chargers use mainly the regular dwell time at the stops to charge their batteries. This results in a strong linkage between the vehicle scheduling and the infrastructure planning. The analysis is based on real-world data of the bus network in Muenster, a mid-sized city in Germany. The outcomes underline the necessity to focus on entire vehicle schedules instead on individual trips. The tradeoff between required battery capacity and charging power is explained in detail. Furthermore, the impact on the electricity grid is discussed based on the load profiles of a selected charging station and a combined load profile of the entire network.

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Section: Introductionmentioning

confidence: 99%

Fast Charging Battery Buses for the Electrification of Urban Public Transport—A Feasibility Study Focusing on Charging Infrastructure and Energy Storage Requirements

2015

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“…When most of the studies are examined, it is seen that instead of determining the location of charging stations for private vehicles, infrastructure studies of public transportation vehicles are also emphasized. Sasaki, Araki, Miyata and Kawaji (2002) mentioned that they have developed a hybrid vehicle for low-floor city buses with an improved capacitor system and miller cycle CNG engine, and the positive results of voltage distribution and fuel use for a 14-tonne bus. Wu and Bucknall (2013) discussed the conceptual design of a hybrid engine to replace the conventional diesel internal combustion engine for Route 226 in London.…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Model for the Location of Charging Station for Electric Buses

DİNÇ YALÇIN,

DOĞAN,

KAYA

et al. 2023

Endüstri Mühendisliği

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In order to create sustainable solutions, the use of electric vehicles instead of traditional vehicles, which is called fossil fuel vehicles, is significant. It is essential to determine the locations of the charging stations to be established so that electric vehicles can be preferred in intercity buses, which are frequently used in the transportation network. For the selection of locations of the charging stations, there are limitations such as waiting times at the charging stations, having sufficient charge for the next stop, and especially the budget. In addition, determining the candidate charging stations among the existing bus stops would increase customer satisfaction as it would prevent extra breaks. However, it may not be possible to use electric buses on every bus route due to both driving range and budget constraints. For this reason, in this paper, a multi-objective mathematical model that minimizes the number of charging stations and maximizes the number of electric buses is proposed and the weighted sum method is used to solve this model. In addition, the proposed mathematical model was solved using the General Algebraic Modeling System (GAMS) with the data of a bus company in Türkiye.

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“…Using a numerical example of Al-Sarki et al [10], we compare the performance characteristic curves of the Atkinson cycle with the curves of the Miller and Joule-Brayton cycles, and summarize the impact of maximizing power density on the performance of cycle efficiency. Sasaki et al [11] reported performance by applying efficient Miller cycles to hybrid buses with high-performance capacitance systems. Performance analysis and optimization of the right-hand [12] turbocharged Miller cycle auto engine was performed.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Study on the Thermodynamic Cycle of Concept Engine with Miller Cycle

Noh

Lee

2021

Processes

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The Atkinson cycle, where expansion ratio is higher than the compression ratio, is one of the methods used to improve thermal efficiency of engines. Miller improved the Atkinson cycle by controlling the intake- or exhaust-valve closing timing, a technique which is called the Miller cycle. The Otto–Miller cycle can improve thermal efficiency and reduce NOx emission by reducing compression work; however, it must compensate for the compression pressure and maintain the intake air mass through an effective compression ratio or turbocharge. Hence, we performed thermodynamic cycle analysis with changes in the intake-valve closing timing for the Otto–Miller cycle and evaluated the engine performance and Miller timing through the resulting problems and solutions. When only the compression ratio was compensated, the theoretical thermal efficiency of the Otto–Miller cycle improved by approximately 18.8% compared to that of the Otto cycle. In terms of thermal efficiency, it is more advantageous to compensate only the compression ratio; however, when considering the output of the engine, it is advantageous to also compensate the boost pressure to maintain the intake air mass flow rate.

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Development of capacitor hybrid system for urban buses

Cited by 19 publications

References 0 publications

Fast Charging Battery Buses for the Electrification of Urban Public Transport—A Feasibility Study Focusing on Charging Infrastructure and Energy Storage Requirements

Fast Charging Battery Buses for the Electrification of Urban Public Transport—A Feasibility Study Focusing on Charging Infrastructure and Energy Storage Requirements

A Mathematical Model for the Location of Charging Station for Electric Buses

A Theoretical Study on the Thermodynamic Cycle of Concept Engine with Miller Cycle

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