5 months ago

MDA Technologies 2/2015

MDA Technologies 2/2015


DRIVE TECHNOLOGIES Further optimization potential 02 Integration of the transmission control into the vehicle control and networking with working hydraulics and engine management control joystick of the working hydraulics are collected and processed in the transmission controller. Depending on the selected driving and working strategy, the desired vehicle speed specified by the driver, the current engine operating point and the working hydraulics power demand, the transmission control adjusts the transmission ratio and specifies an engine speed requirement (Image 2). In the HVT this control concept used for optimizing the interaction between engine, transmission ratio and working hydraulics is called Easy Drive and Work Concept (EDWC). The EDWC can be parameterized based on application requirements and can be expanded with further modules such as hybrid systems. It gives, for example, the possibility of implementation of a control concept for a reach stacker, wherein the driver can simply control a combined lifting of the boom and a high fine positioning accuracy (constant and well controllable vehicle speed) by the accelerator pedal and joystick of the working hydraulics without usage of the brake pedal. The required transmission ratio and diesel engine speed for driving and working hydraulics is optimized and specified by one central interface. A similar driving manoeuvre with a torque converter transmission requires a very experienced and trained driver and usage of the service brakes to counter balance the transmission output torque. Therefore, the control with EDWC not only results in reduced fuel consumption with the same and in some cases even increased driving dynamics, but it also helps in achieving a more comfortable operating and driving pattern of the machine for the driver. Comparison of fuel consumption and performance Due to its advanced control concept and high efficiency, the transmission allows to operate the internal combustion engine in an optimized range. This is achieved on one Modular approach in hardware and software for complete transmission integration into the vehicle control hand by reducing the power requirement for the driving operation and therefore possible downsizing of the engine, and on the other hand by reducing the engine speed required for driving and working. Tests conducted by DRTS with a reach stacker equipped with an HVT-R2 show fuel savings of up to 35% when compared to a similar machine equipped with a conventional torque converter transmission (no lockup). This high reduction in consumption results from the combination of increased transmission efficiency and possible downsizing of the internal combustion engine by approx. 20%. Similar good results were achieved in a wheel loader. A working cycledependent reduction of fuel consumption of up to 25% was measured with HVT-R3 when compared to a wheel loader equipped with conventional torque converter transmission. In addition, the cycle time with same handling performance was reduced by 2%. With the hydrostatic-powersplit transmission HVT as the central component of the powertrain, a consistent coordination of the transmission, engine and vehicle control and a holistic view on the drive and working system, the optimization potential for fuel consumption, vehicle dynamics and operability goes beyond the potential of each individual component. The working hydraulics can be improved further, for example, by using electrical-hydraulic valves and an A10VO pump with electrical-proportional volume flow adjustment from Rexroth. By using a hybrid system on the transmission input, which allows for energy recuperation and energy recovery in the drive and working hydraulics, the usage of brakes can be optimized further, the engine can be protected against over speed and a boosting of drive and/or working hydraulics can be achieved. Even a start-stop functionality can be realized by this. In addition, axles and drive shafts specially adapted to the first hydrostatic driving range offer a significant potential in terms of cost reduction and increase of efficiency. Conclusion The entire Off-Highway market is focused on reducing fuel consumption without sacrificing performance, functionality or operability. First field tests with vehicles equipped with an HVT have clearly shown that these often contrary objectives can be achieved in the future with an innovative transmission and control concept. In order to exploit the complete potential, it is necessary to optimize each drive train component, but above all to consider the components of the drive and working system as a whole and to coordinate their interaction within the control. The hydrostatic powersplit transmission HVT and its advanced control concept is for this task the central module since the potential of the complete system is greater than the sum of the potential of its individual components. Company name: Dana Rexroth Transmission Systems Headquarters: Arco, Italy Established: 2011 Employees: 35 Products: advanced drive transmission, hydromechanical variable transmission THIS ARTICLE IS A CONTRIBUTION BY About 34 MDA Technologies 2/2015

Product News Magnetic valve from Bürkert in variants for high-pressure applications The magnetic valve type 6027 from Bürkert is also available in a high-pressure design up to 250 bar. In this variant the valve seating is sealed with a self-centering ceramic ball seal. The ball material (Al2O3) is resistant to abrasion and wear and is highly resistant to chemicals. Furthermore, the thermoplastic polyether ether ketons (PEEK) are used as seat material. Stainless steel as other material and a laser-welded guide tubes ensure compressive strength, which corresponds to 5x rated pressure, and low leakage. The valve is offered as direct current variant and a rectifier plug is available for devices with alternate current. It is typically used for critical gases and fluids. A high-pressure design offers solutions for test rig. Filling systems for air conditioners in the automobile industry is an example for this. Did you know the Turkish Machinery Sector exports its products to 200 different countries wordwide? Did you know the more than 60% of the export made by the Turkish Machinery Sector goes to EU States and the US? Intelligent hydraulic units from Bosch Rexroth Did you know Turkey is the 6th largest machinery manufacturer of the entire Europe? Did you know more than 5.000 establishments in Turkey operate in Turkish Machinery Sector? The new hydraulic units of ABPAC series from Bosch Rexroth have local intelligence and sensor package, which continuously record all the system conditions of the unit such as oil level and communicate over open interfaces with higher control levels. There the ABPAC provides sensor data, system sizes and the resulting status notifications. The user can read these notifications for example through Ethernet via the machine controller. The series with its container sizes of 100 to 400 l is suitable for common hydraulic applications. The hydraulic basic functions are already integrated in a multi-function block, which also offers an interface for more standardised hydraulic control groups. Did you know R&D investments of Turkish Machinery Sector has doubled in the last 10 years? Turkish Machinery Germany +49 (531) 242 87 26 Visit Turkish Manufacturers @ Hall 5 D36 Visit Turkish Pump and Valve Manufacturers @ Hall 15 F 51


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