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Viewing 1 to 30 of 3584
2015-05-20
Book
This is the electronic format of the Journal.
2015-04-27
Event
2015-04-22
Event
This session covers new production and near-production hybrid powertrains, hybrid architecture, and testing.
2015-04-21
Event
This session covers new production and near-production hybrid powertrains, hybrid architecture, and testing.
2015-04-21
Event
This session covers new production and near-production hybrid powertrains, hybrid architecture, and testing.
2015-04-14
Technical Paper
2015-01-1729
Chenle Sun, Zhe Wang, Zhaolei Yin, Tong Zhang
The linear internal combustion engine-linear generator integrated system is a generating unit with high power density, high efficiency and low emission for the range-extended electric vehicle, which directly transforms the chemical energy of the fuel into the electric energy. The integrated system starts with the linear generator, which shows the advantages of speed and efficiency, as well as the core technology for emission reduction during the starting process and the prerequisite to guarantee the steady operation of the system. This paper focuses on the starting process of the linear internal combustion engine-linear generator integrated system. Pursuant to the starting requirements of the linear internal combustion engine, the starting process that adopts the linear generator as a drive motor is analysed, obtaining the fewest driving cycle and the energy pipeline.
2015-04-14
Technical Paper
2015-01-0250
Yanjing Wang, Chao Feng, Guangming Liu, Hong Fu, Shan Xue, Languang Lu, Jianfeng Hua, Minggao Ouyang
In order to reduce driver’s anxiety about range and energy, one direct and effective approach is to offer the remaining driving range based on the vehicle’s states. However, the estimation of the battery’s remaining energy is a key one of all the factors. This paper introduces a experiment-based model for predicting the remaining energy, which considers many factors, such as current, temperature, difference between battery cells, and so on. This approach ensures the accuracy of the remaining driving range. Finally the scheme is validated through the environment space test. Validation results show that this scheme can offer exact remaining energy , which reduces the error of the remaining range greatly.
2015-04-14
Technical Paper
2015-01-0586
Shugang Jiang, Dharshan Medonza, James Kitchen
The ever increasing requirements for vehicle performance, fuel economy and emission have been driving the development and adoption of various types of hybrid powertrains. Hybrid powertrains are of many different configurations and may include such components as hybrid controller, engine, transmission, generator, battery and battery management system, ultracapacitor, traction motor and inverter etc. A Hardware-in-the loop (HiL) testing solution that is flexible and can be used for different types of hybrid powertrain configurations is greatly desired. This paper describes the design and implementation of a HiL testing system that can be used for testing various hybrid powertrain configurations and as few or as many of the powertrain components. The system is centered on a high performance real time controller that runs necessary driver, powertrain, driveline, and vehicle models.
2015-04-14
Technical Paper
2015-01-1210
Bharat Singh, Amaya Kak, Satya kaul
In the present, vast numbers of problems are triggered due to growing global energy crisis and rising energy costs. Since, on-road vehicles constitute the majority share of transportation; any energy losses in them will have a direct effect on the overall global energy scenario. Most of the energy lost is dissipated from the exhaust, cooling, and lubrication systems, and, most importantly, in the braking system. About 6% of the total energy produced is lost with the airstream in form of heat energy when brakes are applied. Thus, various technological systems need to be developed to conserve energy by minimize energy losses while application of brakes. Regenerative Braking is one such system or an energy recovery mechanism causing the vehicle to decelerate by converting its kinetic energy into another form (usually electricity), which further can be used either immediately or stored until needed.
2015-04-14
Technical Paper
2015-01-1154
Benjamin Black, Tomohiro Morita, Yusuke Minami, David Farnia
Test and validation of control systems for hybrid vehicle power trains provide a unique set of challenges. Not only does the electronic control unit (ECU) or pair of ECUs need to smoothly coordinate power flow between two or more power plants, but it also must handle the power electronics’ high speed dynamics of with PWM signals frequently in the 10-20kHz range. The trend in testing all-electric and hybrid-electric ECUs has moved toward using field-programmable gate arrays (FPGAs) as the processing node for simulating inverter and electric motor dynamics in real time. Acting as a purpose-built processor co-located with analog and digital input and output, FPGAs make it possible for real-time simulation loop rates on the order of 1 microsecond.
2015-04-14
Technical Paper
2015-01-1155
Robert Steffan, Peter Hofmann, Bernhard Geringer
This paper is based on a vehicle research project called CULT (Cars Ultra-Light Technology) under the lead of Magna Steyr Engineering (Graz, Austria) which focuses on the development of an ultra-light (600 kg) vehicle (4-seater, A-segment) with a hybrid propulsion system. The Institute for Powertrains and Automotive Technology of the TU Vienna, was responsible for the complete powertrain development. To reach the project CO2 target of only 49 g/km a downsized CNG DI engine was combined with a 6-gear automated transmission and a Belt-Starter-Generator (BSG). The first part of this paper shortly summarizes the final project results by highlighting the CO2 saving potentials obtained by the 12 Volt BSG. The connection of the BSG on the transmission input shaft instead the conventional adaption on the belt-drive of the ICE should maximize the CO2 potentials. This new approach leads to a significantly increased recuperation potential, because the engine drag torque can be de clutched.
2015-04-14
Technical Paper
2015-01-1156
Qiao Zhang, Weiwen Deng, Jian Wu
Accurate and reliable prediction on power demand is critically important for effective power or energy management for hybrid energy storage systems (HESS) with battery and supercapacitor for electric vehicles. Terrain information is one of the most common factors that greatly influence power demand prediction for both driving and regenerative braking. Since a HESS involves complex interactions between battery and supercapacitor, and between HESS and electric motors via a bidirectional DC/DC converter, the dynamics of these interactions can be greatly affected by the dynamics of power demand generated by varying road slopes with ups and downs, or more generally, the changing terrain, as how the power is to be supplied or to be consumed.
2015-04-14
Technical Paper
2015-01-1158
Justin Wilbanks, Fabrizio Favaretto, Franco Cimatti, Michael Leamy
This paper presents a detailed design study and associated design considerations supporting the development of high-performance plug-in hybrid electric vehicles (PHEVs). Due to increasingly strict governmental regulations and a diminishing supply of fossil fuels, all automotive manufacturers have been tasked with the reduction of fuel consumption and greenhouse gas (GHG) emissions of production vehicles. PHEV powertrains can provide a needed balance in terms of fuel economy and vehicle performance by exploiting regenerative braking, pure electric vehicle operation, engine load-point shifting, and power-enhancing hybrid traction modes. Thus, properly designed PHEV powertrains can reduce fuel consumption while increasing vehicle utility and performance.
2015-04-14
Technical Paper
2015-01-1159
Ran Bao, Richard Stobart
The objective of the work reported in this paper was to identify how turbocharger response time (“turbo-lag”) is best managed using pneumatic hybrid technology. Initially methods to improve response time have been analysed and compared. Then the evaluation of the performance improvement is conducted using two techniques: engine brake torque response and vehicle acceleration, using the engine simulation code, GT-POWER. Three pneumatic hybrid boost systems have been considered: Intake Boost System (I), Intake Port Boost System (IP) and Exhaust Boost System (E). The three systems respectively integrated in a six-cylinder 7.25 l heavy-duty diesel engine for a city bus application have been modelled. When the engine load is increased from no load to full load at 1600 rpm, the development of brake torque has been compared and analysed. The findings show that all three systems significantly reduce the engine response time, with System I giving the fastest engine response.
2015-04-14
Technical Paper
2015-01-1161
Lei Feng, Bo Chen, Ming Cheng
This paper studies predictive control method for Hybrid Electric Vehicle (HEV) energy management to improve HEV fuel economy under aggressive driving. Aggressive driving not only causes car crashes but also greatly impacts the overall efficiency of HEVs. In this paper, Model Predictive Control (MPC), a predictive control method, is applied to improve the fuel economy of power-split HEV under aggressive driving scenarios. A dedicated stochastic model predictive control method is developed and it adopts Markov chain to predict driver’s acceleration pedal and brake pedal inputs in the future based on past information. The power output from the engine and motor will be adjusted to match driver’s power request at the end of the prediction window while avoiding transient peaks of engine power output.
2015-04-14
Technical Paper
2015-01-1149
Donghao Liu, Haisheng Yu, Jiangwu Zhang
Nowadays environmental pollutions and energy efficiency are two of the major challenges for the automotive industry arisen from the increasingly stringent environmental standard. Over the last few years, Hybrid Electric Vehicles (HEVs) have been developed as the most promising solutions that can have the advantages both of the conventional vehicles and electric vehicles. The power-split hybrid powertrain has become the main stream of hybrid electric vehicles in the world market. Toyota hybrid system (THS) is a single mode power-split transmission, which has the advantages for the mechanical configure and control strategy. However, at high vehicle speeds, the speed of the driving motor is quite high, so that the efficiency of the driving motor is poor. General Motors (GM) two-mode hybrid system has two power-split modes and four fixed speed ratio transmissions with different combinations of the clutches to realize cost savings and reduce demand on the motor torque and speed.
2015-04-14
Technical Paper
2015-01-1152
Brendan M. Conlon, Alan Holmes, Margaret Palardy, Trevor Blohm, Leon Zhou, Steven Tarnowsky, Michael Harpster
The Chevrolet Volt is an electric vehicle with extended-range that is capable of operation on battery power alone, and on engine power after depletion of the battery charge. Since its introduction in 2011, Chevrolet Volts have been driven over half a billion miles: 63% as electric vehicles and 37% in extended range driving. For 2016, GM has developed the next generation of the Volt vehicle and “Voltec” propulsion system. This paper describes the second-generation “Voltec”. The features of the propulsion system components, including energy storage, transaxle, electric motors and power electronics, on-board charging, and engine, are described and compared with the previous generation. Next, the transaxle powerflow is discussed and operation under typical driving conditions is explained. Finally, system efficiency and performance data, based on component tests, is presented and compared with the previous generation.
2015-04-14
Technical Paper
2015-01-1153
Kingsly Samuel, David brigham, Mark Jennings
The Powersplit transaxle is a key subsystem of Ford Motor Company’s hybrid electric vehicle line up. The powersplit transaxle consists of a planetary gear, four reduction gears and various types of bearings. During vehicle operation, the transaxle is continuously lubricated by a lube oil pump. All these components consume power to operate and they contribute to the total transaxle losses which ultimately influences energy usage and fuel economy. In order to enable further model-based development and optimization of the transaxle design relative to vehicle energy usage it is essential to establish a physics-based transaxle model with losses distributed across components, including gears, bearings etc. In this work, such a model has been developed. The model accounts for individual bearing losses (speed, torque and temperature dependency), gear mesh losses, lube pump loss and oil churning loss.
2015-04-14
Technical Paper
2015-01-1094
Tsuyoshi Aoyagi
For reducing CO2 emission, hybrid transmission technology is becoming important.Dry multiple-plate clutch system is efficient for reduce drug loss in hybrid transmission. However, there exist several challenges to realize high reliability during those operation.This paper describes new technology for dry multiple-plate clutch.The technology has been adopted to new FWD hybrid transmission system.
2015-04-14
Technical Paper
2015-01-1277
Zhaoping Xu, Dengqiang Wang
[Abstract] Environmental pollution is getting worse and the natural resources become less and less. Hybrid electric vehicles have advantage of energy conservation and environmental protection, so they are more and more popular worldwide. As an important component and part of hybrid electric vehicles, a power plant should be developed for generating electrical power. The free piston generator has advantages of high power density, good fuel adaptability, low manufacture and maintenance costs, energy conservation and environmental protection, so it can serve as the power plant for hybrid electric vehicles. In the past decades, it has gained more and more attentions at home and abroad. At first, the author designed a four-stroke free piston generator with a single piston, and made a prototype experiment. Experiment result proved its feasibility and superiority in energy conservation and environmental protection.
2015-04-14
Technical Paper
2015-01-1162
Frank Atzler, Michael Wegerer lng, Fabian Mehne lng, Stefan Rohrer lng
Downsized engines and 48V electrification are important enablers for achieving future emission and CO2 targets. A perfect fit with an attractive benefit-cost level can be achieved by a holistic approach that goes beyond a simple implementation of individual solutions. Some aspects and results will be given in this publication. The overall propulsion efficiency advancement includes the optimization of the internal combustion engine, the manual transmission as well as the Continental’s 48V Eco Drive system. In combination with the electric motor, the internal combustion engine can be calibrated to work very efficiently and with improved transient response. A comfortable drivability even at low engine speeds can be realized by the improved low-end-torque performance thanks to the electrical engine assist and other propulsion measures.
2015-04-14
Technical Paper
2015-01-1164
Aimee N. Duhon, Kris Sevel, Steven A. Tarnowsky, Peter Savagian
Evaluation of one year of in-use operating data from first generation Chevrolet Volt Extended-Range Electric Vehicle (E-REV) retail customers determined initial trip Internal Combustion Engine (ICE) starts were reduced by 70% relative to conventional vehicles under the same driving conditions. These Volt drivers were able to travel 74% of their total miles in EV without requiring the ICE’s support. Using this first generation Volt data, performance of the second generation Volt is projected. The Southern California Association of Governments (SCAG) Regional Travel Survey (RTS) data set was also processed to make comparisons between realistic PHEV constraints and E-REV configurations. A Volt characteristic E-REV was found to provide up to 40 times more all-electric trips than a PHEV over the same data set.
2015-04-14
Technical Paper
2015-01-1167
Michele De Gennaro, Elena Paffumi, Giorgio Martini, Urbano Manfredi, Stefano Vianelli, Fernando Ortenzi, Antonino Genovese
The experimental measurement of the energy consumption and efficiency of Battery Electric Vehicles (BEVs) are key topics to determine their usability and performance in real-world conditions. This paper aims to present the results of a test campaign carried out on a BEV, representative of the most common technology available today on the market. The vehicle is a 5-seat car, equipped with an 80 kW synchronous electric motor powered by a 24 kWh Li-Ion battery. The description and discussion of the experimental results is split into 2 parts: Part 1 focuses on laboratory tests, whereas Part 2 focuses on the on-road tests. As far as the laboratory tests are concerned, the vehicle has been tested over three different driving cycles (i.e. NEDC, WLTC and WMTC) at two different ambient temperatures (namely +25 ºC and -7 ºC), with and without the use of the cabin heating, ventilation and air-conditioning system.
2015-04-14
Technical Paper
2015-01-1166
Elena Paffumi, Michele De Gennaro, Giorgio Martini, Urbano Manfredi, Stefano Vianelli, Fernando Ortenzi, Antonino Genovese
The experimental measurement of the energy consumption and efficiency of Battery Electric Vehicles (BEVs) are key topics to determine their usability and performance in real-world conditions. This paper aims to present the results of a test campaign carried out on a BEV, representative of the most common technology available today on the market. The vehicle is a 5-seat car, equipped with an 80 kW synchronous electric motor powered by a 24 kWh Li-Ion battery. The description and discussion of the experimental results is split into 2 parts: Part 1 focuses on laboratory tests, whereas Part 2 focuses on the on-road tests. As far as on-road tests are concerned, the vehicle has been tested over three different on-road routes, ranging from 60 to 90 km each, with a driving time ranging from approximately one and half to two and half hours.
Viewing 1 to 30 of 3584

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