Criteria

Text:
Display:

Results

Viewing 1 to 30 of 3645
2016-05-02
Event
2016-04-14
Event
This session covers powertrain control processes related to achieving stringent market fuel economy, emissions, performance, reliability, and quality demands of hybrid and electric powertrains. Topics include the control, calibration, and diagnostics of the engine, powertrain, and supporting electromechanical subsystems related to energy management.
2016-04-14
Event
This session covers recent advances in research, development and engineering of hybrid, plug-in hybrid, and electric powertrains and architectures with particular emphasis on new and near-production technologies.
2016-04-13
Event
This session covers recent advances in research, development and engineering of hybrid, plug-in hybrid, and electric powertrains and architectures with particular emphasis on new and near-production technologies.
2016-04-13
Event
This session covers recent advances in research, development and engineering of hybrid, plug-in hybrid, and electric powertrains and architectures with particular emphasis on new and near-production technologies.
2016-04-12
Event
This session covers recent advances in research, development and engineering of hybrid, plug-in hybrid, and electric powertrains and architectures with particular emphasis on new and near-production technologies.
2016-04-12
Event
This session covers recent advances in research, development and engineering of hybrid, plug-in hybrid, and electric powertrains and architectures with particular emphasis on new and near-production technologies.
2016-04-05
Technical Paper
2016-01-1055
Ashwini Agarwal, Andrew Lewis, Sam Akehurst, Chris Brace, Yash Gandhi, Gary Kirkpatrick
Range extended electric vehicles (REEV) are gaining popularity due to their simplicity, reduced emissions and fuel consumption when compared to parallel or series/parallel hybrid vehicles. The range extender ICE can be optimised to a number of steady state points which offers significant improvement in overall exhaust emissions. One of the key challenges in such vehicles is to reduce the overall powertrain costs, and OEMs providing REEVs such as the BMW i3 have included the range extender as an optional extra due to increasing costs on the overall vehicle price. This paper discusses the development of a low cost auxiliary power unit (APU) for the range extender application utilising a well optimised production automotive two cylinder gasoline engine. The 624 cc production engine was further optimised given the project constraints of low cost changes to suit a range extender application.
2016-04-05
Technical Paper
2016-01-1177
Aditya Dhand, Keith Pullen
There are different types of energy storage devices which are used in today’s hybrid and electric vehicles. Batteries, ultra capacitors and high speed flywheels are the most commonly used ones. While batteries and supercapacitors store energy in the form of electric energy, the flywheel (FW) is the only device that keeps the energy stored in the original form of mechanical energy the same as the moving vehicle. The flywheel needs to be coupled to the driveshaft of the vehicle in a manner which allows it to vary its speed independently of the moving vehicle in order to vary its energy content. In other words a continuously variable transmission (CVT) is needed. The common mechanical variators used in automotive applications, namely the rolling traction drives and the belt drives, have the disadvantage that their speed ratio range defined as the maximum to minimum speed ratio is generally not sufficient for flywheel energy storage system (FESS).
2016-04-05
Technical Paper
2016-01-1237
Vaheed Nezhadali, Lars Eriksson
Increasing legislative demands for the reduction of emissions and also the ever-growing interest for fuel consumption reduction in the automotive industry encourages the development of new technologies in the automotive industry such as powertrain hybridization. However, existence of an electric power source in addition to the traditional internal combustion engine in the powertrain opens up the space for innovations and improvement in the control of transmission systems. In heavy duty applications such as trucks, gearshifting can be performed using engine torque control techniques and automated manual transmission (AMT) systems. For this, during a gearshift, engine torque is reduced to zero in order to synchronize the speed on the input and output sides of the transmission. However, in case of a heavily loaded truck going uphill, the zero torque periods can result in engine stall after the gearshift considering engine acceleration limitations.
2016-04-05
Technical Paper
2016-01-1243
Roberto Finesso, Ezio Spessa, Mattia Venditti
An unsupervised machine-learning technique aimed at the identification of the optimal rule-based control strategy has been developed for a complex not-plug-in hybrid electric vehicle. The approach is based on a preliminary identification of the optimal control strategy, which is carried out by means of a benchmark optimizer, based on the deterministic dynamic programming technique, for different driving scenarios. The optimization is carried out by selecting the optimal values of the control variables (i.e., transmission gear and power flow) in order to minimize fuel consumption, and taking into account several constraints in terms of NOx emissions, battery state of charge and battery life consumption. The results of the benchmark optimizer are then processed with the aim of extracting a set of optimal rule-based control strategies, which can be implemented onboard in real-time.
2016-04-05
Technical Paper
2016-01-1182
Andrej Ivanco, Balan Mariappan Selvaraj, Kawshik Murali, Arjun Narayanan, Avik Sarkar, Aviral Singh, Akshay Soni, Mark Benton, Prasanth Muralidharan, Johnell Brooks, Paul Venhovens, Craig Payne
The Deep Orange framework is an integral part of the graduate automotive engineering education at Clemson University International Center for Automotive Research. The initiative was developed to immerse students into the world of an OEM. For the 6th generation of Deep Orange, the goal was to develop an urban utility/activity vehicle for Generation Z for the year 2020. The objective of this paper is to highlight the step-by-step development process for this vehicle’s powertrain. Market data were examined to define personas on the basis of their demographics and psychographics. The resulting market research, benchmarking, and brand essence studies were converted to consumer needs and wants, to establish technical specifications, which formed the foundation of the Unique Selling Propositions. Then the various sub-systems within the vehicle were developed; a systems integration approach was used to balance design, engineering and project (cost, weight and timing) compromises.
2016-04-05
Technical Paper
2016-01-1154
Peihong Shen, Zechang Sun, Yingjie Zeng, Xinjian Wang, Haifeng Dai
For distributed drive electric vehicle (DDEV), the influence of the power ratio between the front motor and rear motor on its energy efficiency characteristics is investigated. The DDEVs in this study are divided into two different power-train configurations. The first is with its front axle driven by wheel-side motors and the rear axle driven by in-wheel motors, and the second is with both the front and rear axles driven by in-wheel motors. The energy consumption simulation and analysis platform of the DDEV is built with Matlab/Simulink. The parameters of the key components are determined by the experiments to ensure the validity of the data used in simulation. At the same time, the vehicle average energy coefficient is defined to describe the energy efficiency characteristics of the power-train strictly. Besides, the control strategies for driving and braking of DDEV based on energy efficiency optimization are presented.
2016-04-05
Technical Paper
2016-01-1649
Jose Velazquez Alcantar, Farhad Assadian
Optimizing/maximizing regen braking in a hybrid electric vehicle (HEV) is one of the key features for increasing fuel economy. However, it is known [1] that maximizing regen braking by braking the rear axle on a low friction surface results in compromising vehicle stability even in a vehicle which is equipped with an ESP (Enhanced Stability Program). In this paper, we develop a strategy to maximize regen braking without compromising vehicle stability. A yaw rate stability control system is designed for a hybrid electric vehicle with an electrified rear axle drivetrain (ERAD) and a “hang on” center coupling device which can couple the front and rear axles for AWD capabilities. Nonlinear models of the EARD drivetrain and vehicle are presented using bond graphs while a high fidelity model of the center coupling device is used for simulation.
2016-04-05
Technical Paper
2016-01-1669
Chen Lv, Junzhi Zhang, Yutong Li, Bolin Zhao, Ye Yuan
Thanks to the actuation flexibility of their systems, electric vehicles with individual powertrains, including in-wheel and on-board motors, are a very popular research topic amongst various types of electrified powertrain architectures. The introduction of the individual electric powertrain provides great capacity for improvement of the vehicle’s energy efficiency and control performance. However, it also poses tremendous challenges concerning vehicle safety, due to the complex system dynamics and cooperation mechanisms between multi-actuators. For an electric vehicle with independently controlled motors, because of design and manufacturing factors, the steady-state error of each motor output torque, and the flexibilities and nonlinear backlash of left and right drivetrains, can be different. This results in asymmetrical output characteristics of electric powertrain systems on the same axle.
2016-04-05
Technical Paper
2016-01-1231
Dian Liu, Leon Rodrigues, Chris Brace, Sam Akehurst, Gary Kirkpatrick, Lloyd Ash
As electric hybrid powertrains become more widely adopted in passenger vehicles, a variety of electric machine and internal combustion engine architectures has been developed to meet diverse requirements. Research suggests that less than 20 percent of daily driving mileages are over 70 km but that longer trips are relatively common. This fact makes the range extended electric vehicle (REEV) potentially more favourable to typical family usage. To fulfil an everyday full electric commute a smaller battery pack can be used, which reduces cost. An on-board auxiliary power unit (APU) is designed to recharge the batteries for occasional long range trips. Usually, a low-cylinder-count small capacity engine coupled with an electric generator is used in the APU. However, this type of engine inherently exposes the system to more severe torque pulsations due to the lower firing frequency. This is not desirable for intermittent APU operation.
2016-04-05
Technical Paper
2016-01-1175
Ran Bao, Richard Stobart
A control strategy has been designed for a city bus equipped with a pneumatic hybrid propulsion system. The control system design is based on the precise management of energy flows during both energy storage and regeneration. Energy recovered from the braking process is stored in the form of compressed air that is redeployed for engine start and to supplement the engine air supply during vehicle acceleration. Operation modes are changed dynamically and the energy distribution is controlled to realize three principal functions: Stop-Start, Boost and Regenerative Braking. A forward facing simulation model which includes the detailed engine model has been developed in GT-POWER with MATLAB/Simulink co-simulation support. The model facilitates an analysis of the vehicle dynamic performance, engine transient response, fuel economy and energy usage.
2016-04-05
Technical Paper
2016-01-1176
Karim Hamza, Ken Laberteaux
This work presents a modeling approach for estimation of the equivalent greenhouse gas (GHG) 3 emissions of plugin hybrid electric vehicles (PHEVs) for real driving patterns and charging 4 behaviors. In general, modeling of the equivalent GHG for a trip made by a PHEV not only 5 depends on the trip trace in question, but also on the electric range of the vehicle and energy 6 consumption in previous trips since the last charging event. This can significantly the necessary 7 computational burden of estimating the GHG emissions using numerical simulation tools, which 8 are already computationally-expensive. The proposed approach allows a trip numerical simulation 9 starting with a fully charged battery to be re-used for GHG estimation of a trip that starts with any 10 initial state of charge by re-allocating the appropriate amount electric energy to an equivalent gas 11 consumption.
2016-04-05
Technical Paper
2016-01-1241
Denggao Huang, Hui Xie, Shuo Xiong, Tielong Shen, Sun Qiang, Ruichang Zhang
The fuel saving of plug-in hybrid electric city bus (PHEV) is deeply influenced by driving cycle and trip distance. To improve the adaption of energy management strategy, the equivalent coefficient of fuel is the key parameters and need to be pre-optimized based on the predicted driving cycle. An iterative learning method was proposed to get the best equivalent coefficient based on the predicted driving cycle and battery capacity. In the iterative learning method, the bus energy model and kinematics model was built. The DP (dynamic program) method was applied to obtain the best fuel economy as the given equivalent coefficient. The driving paths and running time of city buses are relatively fixed, and their driving cycle can be predicted by route environment. The proposed optimization strategy was applied to the factory sets of plug-in hybrid electric city bus.
2016-04-05
Technical Paper
2016-01-1163
Makoto Taniguchi, Takahisa Yashiro, Keiji Takizawa, Shinichi Baba, Michitaka Tsuchida, Tatsuhiko Mizutani, Hiroatsu Endo, Hiromichi Kimura
As the demand for so-called eco-cars has been increasing recently, new hybrid transaxle P610 has been developed to achieve outstanding fuel economy and an excellent driving performance. P610 was installed in the 4th generation Prius, the first car to implement TOYOTA's new development strategy, TNGA (Toyota New Global Architecture). In order to accomplish the goal, radical reduction of mechanical loss, size and weight, dual-axle motor structure are adopted to draw out the potential capability of the THS (Toyota Hybrid System) to the maximum extent possible. Furthermore, placing the compact power train low, which is realized by installed the PCU(Power Control Unit) on top of the transaxle, led to provide the low center of gravity of the vehicle and excellent driving performance.
2016-04-05
Technical Paper
2016-01-1172
Takashi Iwata, Kyosuke Mori, Taketoki Maruyama, Shinobu Nakamura, Yusuke Yoshida, Toshihiko Yamanaka
Recently, for the aspects of ecology and economy, fuel efficiency improvement demand has been increased globally. And, various types of hybrid systems have been suggested. In response to this market demand, AISIN SEIKI has been developing Synchronizer-less hybrid automated manual transmission (HV-AMT) system aiming excellent transmission efficiency, excellent agility, and shift change quality like a step automatic transmission (AT). This hybrid system is constructed based upon a parallel 2-axis manual transmission (MT) which originally has high transmission efficiency. The synchronizer system of a MT is replaced by a Dog clutch system which does not spoil the transmission efficiency and never makes failure in synchronization. This Dog clutch system includes a modified detent function, a shift actuator of linear motor, advanced function controls for a clutch and a shift actuator.
Viewing 1 to 30 of 3645

Filter

  • Range:
    to:
  • Year: