scholarly journals The End of the M.E.?

2005 ◽  
Vol 127 (05) ◽  
pp. 26-29 ◽  
Author(s):  
Peter Huber ◽  
Mark P. Mills

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.

2018 ◽  
Vol 19 (6) ◽  
pp. 468-472
Author(s):  
Krystian Hennek ◽  
Mariusz Graba

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.


2018 ◽  
Vol 3 (11) ◽  
pp. 32-36 ◽  
Author(s):  
Cao Dao Nam ◽  
Van Vang Le

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.


2005 ◽  
Vol 292 (3) ◽  
pp. 62-69 ◽  
Author(s):  
Steven Ashley
Keyword(s):  
The Road ◽  

Author(s):  
Etim U. Ubong ◽  
Cameron Caufield ◽  
Steven Lathers ◽  
Ricky Gonzalez ◽  
Robert Perzyk ◽  
...  

As the number of hybrid vehicles on the road increases, there is an imminent need for an infrastructural support to make these new acquisitions practicable. This project details the infrastructural design using fuel cell energy from the Technology Park of Kettering University for setting up 10 pilot recharging outlets at the parking lot for the experimental fleet all year round. The Technology Park houses a hydrogen refueling station for a fleet of five buses, fuel cell and solar energy laboratories and various incubators for various alternative energy companies. The current resources at the Center include a 2 kW high temperature HT-PEM produced by GEI, LLC and a GREENLIGHT Test station. The use of solar energy-electrolyzer and fuel cell during the day is also considered for a public parking lot with a capacity of 30 vehicles. The applicable codes and standards regarding such installations are reviewed.


2017 ◽  
Vol 2017 ◽  
pp. 1-17 ◽  
Author(s):  
Rasheed Hussain ◽  
Junggab Son ◽  
Donghyun Kim ◽  
Michele Nogueira ◽  
Heekuck Oh ◽  
...  

Recently an online electric vehicle (OLEV) concept has been introduced, where vehicles are propelled by the wirelessly transmitted electrical power from the infrastructure installed under the road while moving. The absence of secure-and-fair billing is one of the main hurdles to widely adopt this promising technology. This paper introduces a new secure and privacy-aware fair billing framework for OLEV on the move through the charging plates installed under the road. We first propose two extreme lightweight mutual authentication mechanisms, a direct authentication and a hash chain-based authentication between vehicles and the charging plates that can be used for different vehicular speeds on the road. Second, we propose a secure and privacy-aware wireless power transfer on move for the vehicles with bidirectional auditability guarantee by leveraging game theoretic approach. Each charging plate transfers a fixed amount of energy to the vehicle and bills the vehicle in a privacy-aware way accordingly. Our protocol guarantees secure, privacy-aware, and fair billing mechanism for the OLEVs while receiving electric power from the infrastructure installed under the road. Moreover, our proposed framework can play a vital role in eliminating the security and privacy challenges in the deployment of power transfer technology to the OLEVs.


Author(s):  
Mohamed E. M. El-Sayed

Vehicles powered by hydrogen fuel cells produce zero emissions of greenhouse-gases. For this reason, hydrogen fuel cell bus technology has been regarded as a viable alternative for the future of green mass transportation. As a result, several hydrogen fuel cell buses are being commissioned for trials and evaluations on numerous routes worldwide. Despite the relevance of the technology and sincere trials efforts of several fuel cell buses, the progress in the development and utilization of hydrogen fuel cell bus technology has been sluggish at best. In addition, the road to full commercialization of fuel cell buses for public transportation is undefined, unclear, and risky for developers, planners, as well as mass transient end users. Most of the fuel cell buses being tried on the road today are built or converted with the rate of one bus at time. In most cases, a fuel cell system integrator combines a fuel cell from one of the few available suppliers with the bus body from a bus manufacturer for trial or technology demonstration. Accordingly, most of the fuel cell buses being evaluated today could be considered as prototypes or proof of concept. The key characteristics and attributes upon which these buses are being evaluated such as affordability, durability, and reliability have not been matured and validated through a rigorously structured and controlled mass production process. Consequently the results of these evaluations could be misleading. For proper and more objective evaluation of fuel cell bus technologies better understanding of controlled and validated mass production processes is necessary. Unfortunately, there are no documented efforts that address fuel cell buses production concerns. In this paper, development and evaluation issues related to hydrogen fuel cell buses and technologies will be addressed. In addition, some of the key characteristics of fuel cell buses will be studied.


10.29007/6pqr ◽  
2019 ◽  
Author(s):  
Jakub Sevcik ◽  
Jan Prikryl

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.


2002 ◽  
Vol 56 (6) ◽  
pp. 287-290 ◽  
Author(s):  
Gerardo Friedlmeier ◽  
J. Friedrich ◽  
F. Panik

The DalmlerChrysler fuel cell electric vehicle NECAR 4, a hydrogen-fueled zero-emission compact car based on the A-Class of Mercedes-Benz, is described. Test results obtained on the road and on the dynamometer are presented. These and other results show the high technological maturity reliability and durability already achieved with fuel cell technology.


2021 ◽  
Vol 10 (2) ◽  
pp. 181
Author(s):  
Andri Ottesen ◽  
Sumayya Banna

The automotive industry is at a crossroad. Electric Vehicles (EV) now pose an existential threat to the Internal Combustion Engine (ICE). In some Northern European nations over 50% of new cars sold are EVs, owing in large part to substantial financial incentives to buy and own an EV, such as tax discounts when purchasing an EV, fuel savings, and preferential use of transportation infrastructure. These countries have pledged to cease all imports of non-EVs by 2035. On the other end of the spectrum are Gulf Cooperation Council (GCC) countries, where EVs account for less than 1 percent of vehicles on the road, due in large part to financial and non-financial impediments to buying and owning an EV. In addition, the price per kilometer driven in the GCC is considerably lower with gasoline than with electricity, which contradicts the European experience where cost savings from electricity versus gasoline can be around 8 to 1. Furthermore, as there is an absence of purchase and ownership/utilization taxation of vehicles in the GCC, no tax discount can be levied, in contrast to the EV tax incentives common in Europe. This paper explores which qualities of driving and owning an EV in the GCC are necessary to persuade certain kinds of new automobile consumers to pay a higher purchasing price for owning an EV as opposed to an ICE, in spite of higher costs for electricity compared to gasoline per kilometer driven. This pilot study attempts to provide an insight to new car purchasing behavior among consumers in Kuwait via a qualitative innovative approach known as ‘Q Methodology’. Interestingly, the factors that emerged from the research represent three subjective perspectives of new car purchase in Kuwait which were labeled as Factor 1, ‘Value Seeker’; Factor 2, ‘Safety Seeker’; and Factor 3, ‘Performance Seeker’. The study concludes that given financial constraints, the ‘Value Seeker’ group is not likely to become an early adopter of EVs in the GCC region. Conversely, the ‘Performance Seeker’, which includes mainly younger men who are more likely to view the fast acceleration of EVs as a deciding factor, and the ‘Safety Seekers’, who are mainly younger women who would value the environmental aspects of EVs as well as the quiet driving experience and low maintenance requirements are determining factors for EV adoption in the GCC region in the future.  


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