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.