eBSS – Electro-hydraulic demand flow control

Energy-efficient, responsive, forward-looking

We help with the electrification of your working machine!

Development goals

The development of eBSS was carried out in cooperation with the Chair of Mobile Machinery.

The general idea behind the project was to optimise the working hydraulics of mobile machines, especially to increase of efficiency of a forestry crane hydraulic system. By minimising principle-related losses of a load-sensing control, the goal was to save energy by more than 10% by using an electro-hydraulic demand flow control (eBSS).

The following objectives were defined:

• Reduction in fuel consumption
• Minimisation of cooling power requirement
• Reduced oil temperature » lifetime of organic oilsImproved cold start behaviour
• Active influence on vibration susceptibility
• Increased ease of use and productivity
  
  

Our contribution to the environment: energy savings > 10-20 % compared to load sensing systems

Functionality

The electro-hydraulic demand flow control (eBSS) is an innovative system to control pumps and valves in an open circuit. The system is suitableThe electro-hydraulic demand flow control (eBSS) is an innovative system to control pumps and valves in an open circuit. The system is suitablefor stationary and mobile applications.
The pump is controlled electronically and adjusted to the volumetric flow rate requirements of the valves. This results in very direct control of theconsumers and the energy consumption of the load sensing systems can be reduced noticeably.By controlling the pump without feedback, vibrations can be avoided and the reaction time is noticeably shorter compared to LS systems. For the driver, this increases operating comfort and the machine can be controlled more precisely and better.

Hydraulic system of the test machine

LS system before retrofit

• 2 x A10VO71…DFR
• 2 x A10VO71…DFR
• 2 x 130 l/min
• 2 x M4-15 control block for crane
• 1 x M4-12 control block for additional functions
• No oil cooler

eBSS after retrofit

• 2 x A10VO85…EP2DF
• 2 x A10VO85…EP2DF
• 2 x 150 l/min
• 2 x LVS12 control block with digital pilot head for crane
• 1 x M4-12 control block for additional functions
• No oil cooler

eBSS – Ein Förderprojekt der Deutschen Bundesstiftung Umwelt (DBU)