PI 001-15 Lohr am Main, 2015-01-19

EDIS lowers diesel fuel consumption of wheel loaders by up to ten percent

EDIS allows for the use of the previous open center control block for the working hydraulics, which lowers the system costs compared to flow sharing (LUDV).

With the economic EDIS system solution from Rexroth, operators of wheel loaders can lower their fuel consumption by up to ten percent in comparison with concepts with purely open center architecture. First tests with Chinese OEMs show that the savings in operating costs exceed the initial invest for the components in a few months.

The fuel consumption of wheel loaders is a continuous influence on their operating cost. For end users worldwide, fuel consumption along with the purchasing price are decisive criteria. With a small additional investment, the new Energy Demand-oriented Implement System or EDIS from Rexroth can lower fuel consumption by up to ten percent in comparison to conventional open center systems and thus permanently lower operating costs. Depending on the capacity, duty cycles and prices for diesel fuel, the cost of the system can be amortized within a few months. EDIS consists of a combination of fixed-displacement and variable-displacement pumps and a priority valve.

With EDIS, Rexroth has developed a very economical solution for midrange segment wheel loaders of three tons and over. An additional variable-displacement pump controls the flow rate via a priority valve. This ensures continual supply for steering, so that the wheel loader remains maneuverable in all operating situations. As soon as the working hydraulics are required to perform, the variable displacement pump increases the flow rate as needed and with the usual dynamics. This control can be achieved purely hydraulically or electrically. The previous open center control block for the working hydraulics can still be used. With this the system costs are significantly lower than with a flow sharing system (LUDV), such as are used in the high-end segment.

With EDIS, the OEM can additionally increase the working pressure from the previously usual 180 bar to 250 bar and thus achieve further energy savings and improve the steerability.

Up to now, most wheel loaders in the midrange performance class still operate exclusively with fixed-displacement pumps in an open center architecture. With this the flow rate is generated independently of the actual need. At lower working loads, a large proportion of the conveyed hydraulic oil flows unused back into the tank. This increases diesel fuel consumption and thus the operating costs over the entire life cycle.

Rexroth is the worldwide leader for demanding flow sharing systems in premium wheel loaders. They achieve the highest energy efficiency. The new EDIS solution is targeted at the midrange market segment and takes the prevailing cost pressures there into account. The first wheel loaders equipped with this technology from a Chinese manufacturer have already been tested and practical experience with them confirms their significant fuel savings and low amortization periods.

In addition to a wide range of variable-displacement pumps and valves, Rexroth also offers hydraulic brake valves (power brakes), vibration minimizing RSM, as well as hydraulic and electronic joysticks.

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, Factory Automation, and Renewable Energies to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, roughly 36,700 associates generated sales revenue of approximately 5.7 billion euros in 2013.

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The Bosch Group is a leading global supplier of technology and services. In 2013, its roughly 281,000 associates generated sales of 46.1 billion euros. (NB: Due to a change in accounting policies, the 2013 figures can only be compared to a limited extent with the 2012 figures). Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 360 subsidiaries and regional companies in some 50 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. In 2013, the Bosch Group invested some 4.5 billion euros in research and development and applied for some 5,000 patents. This is an average of 20 patents per day. The Bosch Group’s products and services are designed to fascinate, and to improve the quality of life by providing solutions which are both innovative and beneficial. In this way, the company offers technology worldwide that is “Invented for life.”

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Susanne Herzlieb
Maria-Theresien-Straße 23
97816 Lohr am Main
Phone: +49 9352 18-1573

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