Bosch Rexroth develops innovative tractor hydraulic technology


Bosch Rexroth has announced it has developed hydraulic technology to simplify the operation of tractors. 

The e-Load-Sensing (e-LS) electronic signal processing system is designed to optimize the interaction between the tractor and its attachments. 

Consisting of SBx4 valves, pressure sensors, an electronic RC control unit and an electrically-controlled variable pump, the system supports new functions for automated, monitored workflows and simplifies operation of the vehicle. 

A Bosch Rexroth spokesman, said, “All the components simultaneously signal their demand to the control unit. Tractor manufacturers can adapt the system parameters individually using software and dynamically vary them depending on the operating situation.

“They can also align the tractor and attachments so that they recognize one another automatically and the system retrieves pre-defined parameters, which substantially simplifies operation. This helps farmers to obtain maximum results. In addition, when attachments are connected, Rexroth e-LS compensates for line losses in the system.

The reduced power dissipation in standby mode and the variable excess pressure increase energy efficiency further.”

Rexroth e-LS can flexibly adjust the maximum pressure during operation to suit individual attachments and functions. In order to avoid damaging silage bales through over-compression in the bale gripper, manufacturers can limit the pressure of the bale gripper. When it is actuated, the system only permits the preset maximum pressure and the compressive force of the gripper is hydraulically limited. For short power boosts, the pressure can be overridden to suit the situation.

In preparation for future, cloud-based services offered by tractor manufacturers, Rexroth e-LS makes operating data available over the entire life cycle, which can also be wirelessly transmitted to specifically designated points. 

The comprehensive electronic pressure, flow and temperature data enable fast, accurate and cost-effective diagnosis of the hydraulic system without the need for calling in a mechanic to work on the tractor. The data can be read out both at the machine itself or online. 

Thanks to new services, manufacturers can recognize wear on components before they cause a failure. They initiate preventive maintenance measures and thus prevent expensive downtime in the field. On top of this, manufacturers can install software updates on the system ‘over the air’ and thus keep the vehicles fully up to date. 


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Tom is editor of and iVT magazine. During his 20 year career in journalism Tom has worked for a diverse range of titles including Men's Health and Cosmopolitan. He also edits iVT's UKi Media & Events stablemate Traffic Technology International.

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