scholarly journals A Vehicle Device Tailored for Hybrid Trolleybuses and Overhead Wires Implementation in SUMO

10.29007/6pqr ◽  
2019 ◽  
Author(s):  
Jakub Sevcik ◽  
Jan Prikryl
Keyword(s):  
Public Transport ◽  
Combustion Engine ◽  
Electric Circuit ◽  
The Road ◽  
Interesting Possibility ◽  
Traction Substations ◽  
Kirchhoff’S Laws ◽  
On The Road ◽  
Charging Stations ◽  
Public Transport Service

The electrification of transport is one of the key parts of the present aim to reduce undesirable vehicular emissions in the atmosphere. While the full electrification of personal vehicles is mostly associated with employing a big battery pack on the board and charging on (static) charging stations, another interesting possibility appears in the case of public transport – dynamic drawing of the power from overhead wires. Regarding vehicles moving on the road, this concept is used by trolleybuses or hybrid trolleybuses, i.e. vehicles combining power from the overhead wires and batteries.A replacement of classic buses (with a combustion engine) with (hybrid) trolleybuses is hardly possible without an appropriate adjustment of public transport lines and the necessary infrastructure. For this purpose, a simulation of the adjusted public transport service may be used to identify weaknesses of the proposed solution.This paper presents a new vehicle device and a new additional part of road infrastructure in SUMO. It introduces device.elecHybrid based on existing device.battery, extending its functionality and tailoring it for the needs of hybrid trolleybuses. In addition, overhead wires and traction substations are implemented. As the voltage and electric cur- rents in the overhead wires depend on traffic, the overhead wire parameters are optionally evaluated by a built-in electric circuit solver using Kirchhoff’s laws.The proposed changes allow us to simulate hybrid trolleybus in-motion charging under the overhead wire. The extensions can be immediately used in micro-simulations or even (in a simplified version) in the meso-simulation mode.

scholarly journals The influence of exhaust system leak on the operating parameters of a turbocharged spark ignition engine

2018 ◽  
Vol 19 (6) ◽  
pp. 468-472
Author(s):  
Krystian Hennek ◽  
Mariusz Graba
Keyword(s):  
Oxygen Sensor ◽  
Combustion Engine ◽  
Exhaust System ◽  
Spark Ignition Engine ◽  
Si Engine ◽  
The Road ◽  
Torque Measurements ◽  
Si Engines ◽  
Common Technique ◽  
On The Road

Turbocharging of an internal combustion engine is the most common technique to improve an engines’ performance. In present it is not hard to meet vehicles on the road with turbocharged SI engines, which have a high mileage, and because of this fact there is a high risk of exhaust systems leak. This might have its influence not only on the emissions, but also on the vehicles performance. Thereby this dissertation shows the comparative analysis of the influence of exhaust system leak in the catalyzer input on the exhaust gasses composition in the catalyzer output and the operation parameters of an turbocharged SI engine. During the research some parameters were recorded and compared, e. g.: the engines power and torque, the injec-tors opening time, the oxygen sensors voltage signals in the input and in the output of the catalyzer, the concentration of harmful gasses in the exhaust tailpipe. The research was conducted with the use of a single roller MAHA MSR 500 chassis dynamometer. A series of torque measurements was performed. Under these measurements a simulation of the exhaust system leakage of a turbocharged SI passenger car engine was made. As a result three variations of the wideband oxygen sensor acting were reached. The wideband sensor is mounted between the turbocharger unit and the input of the catalyzer. In the test the influence of the leakage on the injector’s opening time and the composition of harmful exhaust substances were pointed.

scholarly journals The End of the M.E.?

2005 ◽  
Vol 127 (05) ◽  
pp. 26-29 ◽  
Author(s):  
Peter Huber ◽  
Mark P. Mills
Keyword(s):  
Fuel Cell ◽  
Mechanical Engineering ◽  
Combustion Engine ◽  
Electrical Power ◽  
Single Step ◽  
Second Century ◽  
Basic Operation ◽  
The Road ◽  
Energy Economy ◽  
On The Road

This article highlights that mechanical engineers control most of the rest of our energy economy. The engineering focus will shift inexorably toward finding the most efficient means of generating electricity on-board. Trains and monster trucks both use big diesel generators. Hybrid cars on the road today burn gasoline, but it is the fuel cell that attracts the most attention from visionaries and critics of the internal combustion engine. Remarkably elegant in its basic operation, the fuel cell transforms fuel into electricity in a single step, completely bypassing the furnace, turbine, and generator. In this scenario, mechanical engineering ultimately surrenders its last major under-the-hood citadel to chemical engineers. One might say that the age of mechanical engineering was launched by James Watt's steam engine in 1763, and propelled through its second century by Nikolaus Otto’s 1876 invention of the spark-ignited petroleum engine. We are now at the dawn of the age of electrical engineering, not because we recently learned how to generate light-speed electrical power, but because we have now finally learned how to control it.

Not Enough Money: The Resources and Choices of the Motoring Poor

2002 ◽  
Vol 6 (1) ◽  
pp. 95-111 ◽  
Author(s):  
Julie Froud ◽  
Sukhdev Johal ◽  
Adam Leaver ◽  
Karel Williams
Keyword(s):  
Public Transport ◽  
Car Ownership ◽  
Social Aspect ◽  
Policy Makers ◽  
The Road ◽  
Poor Households ◽  
Labour Market Participation ◽  
The Social ◽  
On The Road ◽  
The Uk

This paper helps to develop the social aspect of a new agenda for automobile research through focusing on motoring expenditure in the UK by poor households. It moves the social exclusion debate on by going back to Rowntree's 1901 survey, which established that poverty entailed not having enough resources to meet the needs of the household. Rowntree's analysis of primary and secondary poverty is updated here through the focus on the resources and choices of poor households, which incur significant motoring costs as the price of participation. Statistical sources and interviews in Inner and Outer London are used to explore these issues and the analysis shows that the story is one of constraint, sacrifice and precariousness. Car ownership imposes large costs on poor households, which limit other consumption opportunities. Labour market participation may depend on such sacrifices where public transport and local employment opportunities are limited. This locks poor households into a precarious cycle whereby the car is necessary to get to work and the job is necessary to keep the car on the road. Using Rowntree by analogy, the paper argues that, as well as improving public transport provision policy makers must also recognise the problem of poverty.

scholarly journals The Strategies of NOx Emission Reduction for Diesel Engines

2018 ◽  
Vol 3 (11) ◽  
pp. 32-36 ◽  
Author(s):  
Cao Dao Nam ◽  
Van Vang Le
Keyword(s):  
Diesel Engines ◽  
Combustion Engine ◽  
Control Strategies ◽  
Direct Injection ◽  
Low Temperature Combustion ◽  
Technical Problems ◽  
Direct Injection Engines ◽  
The Road ◽  
Loading Mode ◽  
On The Road

Diesel engines are more efficient than forced ignition engines but due to diffused combustion and work with high air residue levels, burning products contain soot and NOx, pollutants that work Handling it on the road today still has many technical problems. The technology of organizing the combustion of diesel engines directly affects the level of pollution generated. Direct injection diesel engines have a lower fuel consumption than a combustion engine with a separation of about 10% and a lower level of soot emissions when the engine is operating in local loading mode. However, direct injection engines work noisier and generate more pollutants (NOx, HC). Today, this type of combustion chamber is only used for heavy-duty truck engines. Limiting the optimal emission level for diesel engines needs to balance the concentration of the two main pollutants, NOx and soot. Low temperature combustion (LTC) engines need different enabling technologies depending on the fuel and strategy used to achieve combustion of the premixed fuel–air mixture. Controlling the combustion rate is one of the major challenges in LTC engines, particularly in PPCI combustion engine to achieve higher thermal efficiency, the desired phasing of combustion timings is essential even at moderate combustion rates. Present chapter describes the combustion control variables and control strategies used for LTC engines. Various methods demonstrated to control the LTC engines can be categorized in to two main strategies: (i) altering pressure–temperature and (ii) altering fuel reactivity of the charge.

A Distribution Model of Electric Vehicle Charging Station

2010 ◽  
Vol 44-47 ◽  
pp. 1543-1548 ◽  
Author(s):  
Zhen Po Wang ◽  
Peng Liu ◽  
Hai Bin Han ◽  
Chun Lu ◽  
Tao Xin
Keyword(s):  
City Planning ◽  
Geographic Location ◽  
Service Level ◽  
Distribution Model ◽  
The Road ◽  
Charging Station ◽  
Electric Vehicle Charging ◽  
On The Road ◽  
Charging Stations

The location and the overall arrangement of the charging stations is an important problem with the development of electric vehicles. It is related to the charging needs, city planning, service level of charging station, geographic location and competitive ability and so on. A distribution model of EV charging station is introduced in the paper. In order to describe the model preferably, this paper introduces the attractive factor of charging stations and the area-different factor. The model can give the charging station rational positions by analyzing the data of the traffic flow and the electric-consuming-rate of cars on the road. A case study is given to illustrate the applying the model.

scholarly journals On the road to fossil-free public transport: The case of Swedish bus fleets

Energy Policy ◽  
2017 ◽  
Vol 100 ◽  
pp. 397-412 ◽  
Author(s):  
Maria Xylia ◽  
Semida Silveira
Keyword(s):  
Public Transport ◽  
The Road ◽  
On The Road

Effect of particulate matter 2.5 exposure to urinary malondialdehyde levels of public transport drivers in Jakarta

2020 ◽  
Vol 35 (3) ◽  
pp. 295-300
Author(s):  
Damai Arum Pratiwi ◽  
Budi Haryanto
Keyword(s):  
Oxidative Stress ◽  
Public Transport ◽  
Linear Regression Analysis ◽  
Ventilation System ◽  
Multiple Linear Regression Analysis ◽  
Cross Sectional ◽  
Personal Protection Equipment ◽  
The Road ◽  
On The Road ◽  
Cross Sectional Design

AbstractBackgroundPeople who work long hours on the road are intensively exposed to high levels of fine particulate matters (PM2.5) which may lead to oxidative stress mechanisms in the human body that cause deleterious health problems. Malondialdehyde (MDA) is the major metabolite produced during lipid peroxidation metabolism that serves as a reliable biomarker for oxidative stress in cells.ObjectivesTo identify the association between PM2.5 exposure and other characteristics with urinary MDA levels among public transport drivers in Jakarta.MethodsA cross-sectional design was implemented by involving 130 public transport drivers of nine trajectories from Kampung Melayu Terminal, Jakarta. The continuous PM2.5 data were collected in personal measurement during one round trip of driving. Weight and height measurements were obtained to calculate body mass index (BMI) and structured questionnaires were completed to identify other characteristics. MDA levels were examined from the driver’s urine right after driving and evaluated using TBARS analysis.ResultsThe average of PM2.5 exposure was 91.56 ± 20.05 μg/m3 and MDA levels were 2.23 ± 1.57 nmoL/mL. Drivers with overweight and obese BMI had significantly higher MDA levels (2.66 ± 1.65 nmoL/mL) compared to those with normal and underweight BMI status (1.97 ± 1.47 nmoL/mL). Multiple linear regression analysis demonstrated low PM2.5 exposure, normal and underweight BMI status, and a long period of working as drivers were associated with MDA levels (p<0.05). Contrary to the prior study, PM2.5 exposure was negatively associated with MDA levels due to most drivers’ BMI status being normal and underweight.ConclusionOur study suggests that the drivers who were obese and overweight should lose weight to lower the risk of increased MDA levels. We also suggest the drivers to consider maintaining their vehicle’s ventilation system or using personal protection equipment (PPE) to avoid high PM2.5 exposure while driving.

scholarly journals Determination of Time Savings for Passengers by Applying the Public Passenger Transport Preference in Cities

2018 ◽  
Vol 20 (3) ◽  
pp. 3-8 ◽  
Author(s):  
Jozef Gnap ◽  
Jana Kupculjakova ◽  
Stefania Semanova
Keyword(s):  
Public Transport ◽  
Road Traffic ◽  
Passenger Transport ◽  
The Public ◽  
The Road ◽  
Survey Results ◽  
Time Savings ◽  
On The Road

The paper deals with the issue of delays of public transport vehicles at the signal controlled junctions. Based on the road traffic survey results, the average values of vehicle delays were determined. By using those values, it is possible to define time savings for the vehicles and mainly for passengers that are transported. The time savings were determined based on the relationships and coefficients defined in this paper.

FEATURES OF THE STRUCTURE OF TRANSPORT HUB IN THE URBAN ENVIRONMENT

2019 ◽  
pp. 18-23
Author(s):  
I.B. Volkodaeva ◽  
L.S. Napreenko
Keyword(s):  
Air Pollution ◽  
Urban Environment ◽  
Public Transport ◽  
Environmental Conditions ◽  
Road Transport ◽  
Design Methods ◽  
Transport Network ◽  
The Road ◽  
On The Road

The article examines the prerequisites for creating a transport hub in an urban environment, ways to simplify navigation and increase passenger comfort by design methods. The classification of transport hubs is given, the features of their formation based on environmental conditions are highlighted, the requirements for transport hub are formulated. Thus, the development of the system of transport hubs leads to a decrease in comfort when using public transport and stimulates the rejection of personal transport, which in turn leads to a decrease in the load on the road transport network and reduced air pollution.

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