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2017-03-07
Event
2016-11-02 ...
  • 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.
2016-09-27
Technical Paper
2016-01-8113
Xiaohua Zeng, Guanghan Li, Dafeng Song, Sheng Li, Xianghua Li
This paper introduces the configuration and operation principle of the hydraulic hub-motor auxiliary system for heavy truck, which could achieve auxiliary driving and auxiliary braking function. In order to achieve coordinate distribution of the engine power between mechanical and hydraulic system, the hydraulic pump displacement controller is designed. A layered auxiliary drive control strategy is proposed to improve vehicle performance. Finally, the simulation model is built in the MATLAB/Simulink and AMESim platform and the co-simulation is conducted to verify the proposed control strategy. The results show that the strategy could realize effective control and the traction force increased proportion can be up to 15.6~17%, which would significantly improve the drivability and passing capacity of heavy truck.
2016-09-27
Technical Paper
2016-01-8121
Riccardo Bianchi, Addison Alexander, Andrea Vacca
Vibrations at the cabin or at the implements of construction machinery represents important drawbacks from the points of view of machine productivity, safety and operator comfort. Oscillations of these machines are particularly relevant due to the absence of shock absorbers, typical of many machines such as wheel loaders, and their use in uneven ground conditions. Several hydraulic solutions have been proposed in the past to reduce oscillations at both the cabin or at the machine boom. Particularly, cabin oscillations can be attenuated by properly counteracting the exciting oscillatory forces from the tires with motion of the boom. Many state of the art machine utilize a passive methods to implement this strategy. The present work introduces a novel active solution, based on the control of the boom actuator without involving modifications of the standard hydraulic system.
2016-09-27
Technical Paper
2016-01-8063
David Ferreira, Thomas Howell, Peter Jo
Heavy duty valvetrains are not able to incorporate hydraulic lash adjusters due to the inclusion of an engine brake. As an engine brake introduces substantial lash into the valvetrain due to the addition of additional valve motions, the HLA would pump up. Jacobs Vehicle Systems has developed a new mechanism to allow the inclusion of an engine brake into a valvetrain equipped with hydraulic lash adjusters. The fulcrum system maintains a load on the hydraulic lash adjuster during engine brake operation preventing the HLA from pumping up. The addition of hydraulic lash adjusters allows for simpler manufacturing, less maintenance, reduced NVH and valve motion enhancements. This paper describes the design, simulation and testing of the lashless valvetrain including the next steps in the development of the valvetrain.
2016-09-18
Technical Paper
2016-01-1938
Xin Gao, Tie Wang, Mengzuo Han
Hydraulic retarder is an auxiliary brake used by commercial vehicle in long slope brake. Working liquid generates a lot of heat during hydraulic retarder working. If the heat is not properly managed, it will seriously affect hydraulic retarder braking performance. Refrigerant outlet temperature of condenser in Rankine cycle is lower, condensing more fully. But the two-phase area of evaporator reduces or even disappears. Anyhow, Rankine cycle evaporate-condensate system parameter setting not reasonable will affect efficiency of whole system and the temperature stability of hydraulic retarder. The article uses Rankine cycle which refrigerant is R141b to replace hydraulic retarder original cooling system. It can make hydraulic retarder heat exchange in time and working fluid temperature stability in a smaller range.
2016-09-18
Technical Paper
2016-01-1941
Tie Wang, Xin Gao, Zhiwei Zhang
Vehicle hydraulic retarder is applied in heavy-duty trucks and buses as an auxiliary braking device. In traditional cooling system of hydraulic retarder, working fluid is introduced into heat exchanger to transfer heat to cooling liquid in circulation, whose heat is then dissipated by engine cooling system, not enabling waste heat of working fluid used effectively. In hydraulic retarder cooling system based on Rankine cycle, organic working fluid transfers heat with hydraulic retarder working fluid in Rankine cycle, and then outputs power through expansion machine. It can both reduce heat load of engine cooling system, and enhance thermal stability of hydraulic retarder while recovering and utilizing braking energy. First of all, according to the target vehicle model, hydraulic retarder cooling system model based on Rankine cycle is established.
2016-09-18
Technical Paper
2016-01-1927
Christian Riese, Frank Gauterin
New technologies like alternative power trains and driver assistance systems have a big impact on brake system development. Most of the development work aims at the improvement of actuation and modulation of the brake system. The basic hydraulic network remained nearly the same over decades and still has to meet these new requirements. Previous papers have focused mainly on studying the behaviour of single components, like for example the brake hose fluid consumption in detail. Other papers studied the complete system but simplified it extremely, so that some relevant effects are neglected. In this work, one focus is to study the influence of single relevant components, like the hydraulic unit and the hoses on the overall system performance. For this measurements with a complete hydraulic brake system, including a state of the art electromechanical brake booster and single component measurements for identification are conducted.
2016-09-14
Technical Paper
2016-01-1871
Renxie Zhang
Path following controller of a six-wheel skid-steering vehicle is designed. The vehicle speed is controlled through engine speed control and the lateral vehicle steering is controlled through hydraulic braking on each side. Contrary to the common approaches considering non-holonomic constraints, vehicle dynamic characteristics and rotating wheels are considered. A hierarchical control structure is applied in this vehicle control system. The kinematic controller works out the reference yaw rate and reference vehicle speed. And a robust dynamic controller tracks the reference signal. In addition, the dynamic controller takes actuator ability into account.
2016-09-14
Technical Paper
2016-01-1886
Zhuoping Yu, Yi Zhang, Lu Xiong, Songyun Xu
With development of vehicle advanced driver assistant system and intelligent techniques, safer and more intelligent Integrated-Electro-Hydraulic Braking System is required to realize brake-by-wire. Thus, more and more companies and universities developed Integrated-Electro-Hydraulic Braking System to fulfill these requirements. In this paper, an Integrated-Electro-Hydraulic Braking System is introduced, which consists of active source power, pedal feel emulator, electro control unit and hydraulic control unit. As a composite system of mechanic, electron and hydraulic pressure, the Integrated-Electro-Hydraulic Braking System has complex system characteristics. Based on system characteristics experiments through test rig, characteristics of Integrated-Electro-Hydraulic Braking System and active power source are compared, the two systems have very different dynamic characteristics.
2016-07-14
Standard
J1513_201607
The performance requirements have been established for external automatic slack adjusters when tested to SAE J1462.
2016-07-13
WIP Standard
ARP4150A
This SAE Aerospace Recommended Practice (ARP) is intended as a guide in establishing inspection procedures to determine the condition of inservice accumulators. A minimum inspection program is recommended to determine the existence of corrosion and damage. Recommendations are also provided for corrective action if it is determined that the environment is contributing to the deterioration of the surface protection system treatments.
2016-07-13
Standard
AS1576E
This document defines the requirements for weld fittings and machine weldments using an orbiting welding head suitable for use on cold worked 3Al 2.5V titanium, 21Cr 6Ni 9Mn CRES, and 718 nickel alloy tubing. Fitting standards covered by this specification include non-separable welded elbow, tee, and reducer fittings, and reconnectable 24 degree cone fittings such as sleeves and unions.
2016-06-27
WIP Standard
AS5972G
SCOPE IS UNAVAILABLE.
2016-06-27
WIP Standard
AS5869E
Scope is unavailable.
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