Criteria

Text:
Display:

Results

Viewing 1 to 30 of 5452
2016-04-27 ...
  • April 27-29, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
  • November 2-4, 2016 (8:30 a.m. - 4:30 p.m.) - Troy, Michigan
Training / Education Classroom Seminars
Hydraulic brake systems, one of the most important safety features on many road vehicles today, must meet manufacturer and customer requirements in addition to Federal Motor Vehicle Safety Standards. This course will analyze automotive braking from a system's perspective, emphasizing legal requirements as well as performance expectations such as pedal feel, stopping distance, fade and thermal management. Calculations necessary to predict brake balance and key system sizing variables that contribute to performance will be discussed.
2015-10-07
Event
Fluid power is the best technology for mechanical power transmissions in many applications, including commercial and off-road vehicles. This session will present important research aspects related to different hydraulic actuation systems and hydrostatic transmissions. More energy efficient and controllable technologies alternative to current state-of-the-art systems will be presented.
2015-10-07
Event
Fluid power is the best technology for mechanical power transmissions in many applications, including commercial and off-road vehicles. This session will present important research aspects related to different hydraulic actuation systems and hydrostatic transmissions. More energy efficient and controllable technologies alternative to current state-of-the-art systems will be presented.
2015-10-07
Event
Topics include the effects of traditional and alternative fuels, and additives on deposit formation, intake system cleanliness, friction, wear, corrosion, and elastomer compatibility. Also covered are effects of fuel specification on drivability, on evaporative emissions, and on the relationship between emissions and drive cycle. In addition, this session covers the analysis, design, testing, and manufacturing techniques and methodologies of all fuel injection systems and their components.
2015-10-06
Event
Although not as well-known as their electric siblings, hydraulic hybrid vehicles have made strong progress in recent years. Hydraulics may in fact be the better efficiency solution for many vehicle applications. This session will examine hydraulic hybrid vehicles from research through production ready phases.
2015-09-29
Technical Paper
2015-01-2872
Massimiliano Ruggeri, Andrea Cervesato, Carlo Ferraresi
Performance requests and machine automation, in conjunction with new regulations for agriculture, earthmoving and construction machines, represent today the most difficult challenge for machine designers and researchers. Machine control systems complexity and functional safety regulation compliance, are the most complex requirements to deal with in new machines design. The paper describes a steering system design, of a 6 wheels agricultural front articulated self-propelled machine, that must comply with new regulations in terms of functional safety. The vehicle steering is driven by an electro-hydraulic system, totally controlled using by wire electronics; the rear wheels are independently steering and controlled. This architecture requires a too high functional safety performance level.
2015-09-29
Technical Paper
2015-01-2851
Regulatory emission requirements as well as owning and operating cost are primary market drivers for OEMs and component suppliers to focus on more efficient machine technologies. As a result, new technologies are being developed in the area of Hydraulics, Power Trains, Electronics, Engines and controls of these subsystems and components. Some of the technology potentials have been known for quite some time but were only just partially commercialized. Examples of these technologies are: more efficient and electrically controlled hydraulic systems, CVT transmissions, electric drives, reduction in engine speeds including their integration. Although automotive industry has been leading technology developments, in the recent decade significant work has been done in the off-highway applications.
2015-09-29
Technical Paper
2015-01-2761
Boris Belousov, Tatiana I. Ksenevich, Sergei Naumov, Vitalii Stepnov, Anna Klimachkova
An electro-hydraulic servo system makes the basis for a mechatronic locomotion module (LM) and for a complex comprising an LM and an undercarriage of a vehicle. The servo system of the wheel module/LM complex is a combination of the information and power channels of the electro-hydraulic wheel drive within the steering system. A combination of the servo systems makes up a complex of servo systems of the steering system of the multi axis wheel mover of the vehicle. Theoretical and experimental studies of the functioning all wheel steering were aimed on substantiation the rational algorithmic maintenance of the automatic control system. The results of the study allowed formulating the basic principles of designing and calculating the functionality algorithms for the steering system of the complex of mechatronic modules of the multi axis vehicle.
2015-09-29
Technical Paper
2015-01-2850
John Kargul, Andrew Moskalik, Kevin Newman, Daniel Barba, Jeffra Rockwell
The United States Environmental Protection Agency’s (EPA’s) National Center for Advanced Technology (NCAT), located at its National Vehicle and Fuel Emissions Laboratory in Ann Arbor, Michigan, has been known for its development and demonstration of numerous low-greenhouse gas and fuel efficient series hydraulic hybrid drivetrain technologies and their application in commercial vehicles. Advances in these very fuel efficient hydraulic hybrid vehicle technologies have led the industry to begin manufacturing these exciting new technologies for both the commercial truck and non-road equipment markets, with development activities continuing in other markets including light-duty vehicles. The commercial emergence of these very low-greenhouse gas emitting hybrids led EPA to decide that the time had come to wind down its leadership role in developing and demonstrating these very fuel efficient technologies.
2015-09-29
Technical Paper
2015-01-2853
Enrique Busquets, Monika Ivantysynova
Over the last decade, a number of hybrid architectures have been proposed with the main goal of minimizing energy consumption of off-highway vehicles. One of the architecture subsets which has progressively gained attention is hydraulic hybrids for earth-moving equipment. Among these architectures, hydraulic hybrids with secondary-controlled drives have proven to be a reliable, implementable, and highly efficient alternative with the potential for up to 50% engine downsizing when applied to excavator truck-loading cycles. Multi-input multi-output (MIMO) robust linear control strategies have been developed by the authors’ group with notorious improvements on the control of the state of charge of the high pressure accumulator. Nonetheless, the challenge remains to improve the actuator position and velocity tracking.
2015-09-29
Technical Paper
2015-01-2854
Timothy Opperwall, Andrea Vacca
Hydraulic systems have an important role in both on and off-highway vehicles. Designing for improved noise performance of fluid power systems is an essential part of improving current systems and opening up new areas where fluid power can bring improvements in efficiency and performance. As the technology advances and spreads to lighter applications, the noise generation and propagation due to hydraulic components becomes a primary design concern. The present research includes development of acoustic radiation models for noise radiation from hydraulic pumps and motors. The need for new methods for identification of noise sources and transmission is evident in order to direct future modeling efforts. Discovering the key features of noise generation from both simulation and experimental techniques allows for improved techniques to improve the noise performance of fluid power components and systems.
2015-09-29
Technical Paper
2015-01-2855
Massimiliano Ruggeri, Giorgio massarotti, pietro marani, Carlo Ferraresi
In recent years many studies were performed with the aim of reducing losses and to optimize the oil flow management in complex machines like excavators. One of the most promising ideas is the pump switch, due to the flexibility of switching one or more pumps to serve one actuator, as a function of oil flow request and machine mode. These studies were basically developed in MAHA fluid power center in US and are based on a distribution manifold were hydrostatic transmissions are applied to the different loads. The system presented couples more actuators to every single pumps and offers also cross connections, in order to increase systems flexibility in flow management.
2015-09-29
Technical Paper
2015-01-2856
Hongbin Wang, Ojas Patil, QingHui Yuan, Aaron Hertzel Jagoda
Fuel economy of both highway and off-highway vehicles is a major driver for new technology development. One of the technologies to meet this driver is a digital valve based hydraulic system. Digital valves are high speed on/off valves which are, in this case, using a pulse width modulated duty cycle to control flow. This enables flow control to multiple actuators at varying pressures without the losses associated with conventional throttling based flow control. By sequentially actuating the valves the pump is only connected to one load at any given time, this allows flow sharing from a common fluid power source, such as a pump, to multiple services without utilizing compensators or other metering devices. This also enables advanced control of the flow supplied to a given actuator and allows a different control strategy for each actuator. There is the potential to increase machine productivity through more efficient use of the installed engine power.
2015-09-29
Technical Paper
2015-01-2725
Amine Nhila, Daniel Williams
Over the years, steering systems have evolved from simple manual steering in the early car models to hydraulic power steering in the middle of the 20th century, and eventually to today’s systems where electric power steering is becoming more prevalent, specifically in light vehicles such as passenger cars. However, due to their relative low power density, electrical steering systems did not gain much traction in heavy vehicles, at least not as the sole source of power assistance. As a result of their higher power density, hydraulic power steering systems remain the main solution for steering heavy vehicles. Nonetheless, when these systems were first designed energy savings, and CO2 emissions were not a major concern while fuel prices were relatively low. Consequently, today’s state-of-the-art steering systems are not as efficient as they can be, and thus cause higher emissions.
2015-09-29
Technical Paper
2015-01-2852
Daniel Ribeiro, Rodrigo Chaves, Rogerio Curty Dias, Gian Marques
In order to evaluate the opportunities to use hybrid concepts for heavy commercial vehicles for emerging markets, MAN Latin America has developed a VW refuse truck with 23t GVW using the hybrid hydraulic technology. In site vehicle tests measurements has indicated a fuel savings up to 25%, which means a reduction around 4.08 liters of diesel/hour or 20 tones CO2/year . Thus, a collaborative cooperation with Rio de Janeiro Sanitation Department (Comlurb) was set for a truck evaluation on a real operation. This 03-month evaluation used one VW 17.280 6x2 hybrid hydraulic refuse truck and other VW refuse truck similar standard diesel. A random dispatch system ensures the vehicles are used in a similar manner. Global positioning system logging, fueling, and maintenance records are used to evaluate the performance of this hybrid hydraulic refuse truck.
2015-09-29
Technical Paper
2015-01-2801
Yuandong Liu, Gangfeng Tan, Xuexun Guo, Li Zhou, Wenbin Liu, Zhiqiang Hu, Kangping Ji, Binyu Mei
The hydraulic retarder, which is an important auxiliary brake, has been widely used in heavy vehicles. Under the non-braking working condition, the air resistance torque in the working chamber, which is formed for the rotor of hydraulic retarder stirs the air, causes pumping loss. This research designs a new hydraulic retarder, which the helium is charged into working chamber through closed loop gas system under non-braking working condition, can reduce the parasitic power loss of transmission system. First, under non-braking working condition, the resistance characteristics are analyzed based on the hydraulic retarder pumping model; Then, considering some parameters, such as the volume of chambers and the initial gas pressure, the working chamber gas charge model is established, and the transient gas charge characteristics are also researched under non-braking working condition.
2015-09-27
Technical Paper
2015-01-2699
Songyun Xu, Zhuoping Yu, Lu Xiong
With the electrification and intelligentialization of vehicle, requirements on more intelligent and integrated brake system are put forward. A novel integrated-electro-hydraulic brake system(I-EHB) for automotive is presented to fulfill these requirements. Based on the analysis of requirements the operating mode of I-EHB are formed. Then the system function modes and system topological structure are proposed. After the selection of components the parameter design is accomplished by modeling the system. According to the above-mentioned design method an I-EHB prototype made. I-EHB consists of active power source (APS), pedal feel emulator (PFE), electro control unit (ECU) and hydraulic control unit (HCU). APS includes motor, master cylinder and retarding mechanism consisting of warm, gear and gear rack. Using test rig the system characteristics of I-EHB are tested. According to test friction and non-linear phenomena in hydraulic pressure control are found.
2015-09-27
Technical Paper
2015-01-2703
Guirong Zhuo, Fei Yu, Yilin Ren
The braking torque allocation of the ABS of the electro-hydraulic brake system in the electric vehicles is studied and the braking torque is distributed based on the frequency in order to achieve good braking effect. There are two common braking torque allocation strategies based on frequency : one is based on the principle of filter filter and the other is based on the weighted least squares algorithm. For the former the paper selects butterworth filter to perform the braking torque allocation, then the ABS braking torque allocation strategy based on Butterworth filter and the braking torque allocation strategy based on the weighted least squares are analyzed respectively and then contrast their braking effect with Simulink.The results show that the effect of the allocation strategy based on weighted least squares is more ideal and its control is more precise by contrast.
2015-09-15
Technical Paper
2015-01-2414
Carsten Dunker, Riko Bornholdt, Frank Thielecke, Robert Behr
The More-Electric Aircraft is considered to be one of the main goals for future aircraft systems. An important milestone of this aim, the All-Electric Engine without hydraulic pumps and bleed-air systems, could be realized by using electro-hydraulic power generation and central hydraulic distribution systems. These systems are powered by electric motor pumps and use cost-efficient and state of the art hydraulic actuator technologies. Additionally, this approach would comply with the present incremental development strategy of the airplane manufacturers. Although changes seem to be small these architectures have a major effect on the hydraulic system sizing. Therefore a methodology for an initial architecture optimization of hydraulic power systems and a subsequent parameter optimization is presented to evaluate the design space for future electro-hydraulic architectures.
Viewing 1 to 30 of 5452

Filter

  • Range:
    to:
  • Year: