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Drive and Control Systems for Tractors
The Rexroth EHR - more than just a Hitch control
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A key function in tractors is to transmit the machine forces and convert them to work in the fields in an economical, soil-friendly manner. Here, our hitch control comes into its own. Today, it forms part of standard tractor equipment. It provides the farmer with numerous useful functions for mastering his tasks with economy and comfort.
Integrated systems for greater comfort
Bosch Rexroth leads the market as a parts supplier, manufacturer and developer of the EHR system. This necessitates the use of tried and tested components such as the control unit, servo solenoid valve, operator controls and sensors. When successfully combined, the individual elements result in a sturdy, user-friendly unit, that still works reliably even many years later.
With on-board electronics to the mechatronic unit
The latest technology is constantly being integrated in the components of the Rexroth EHR. The introduction of on-board electronics (OBE), for example, combines the servo solenoid valve and electronics to form a mechatronic unit – a heart and brain, so to speak, for the electrohydraulic hitch control.
Rexroth EHR – functions with precision
The EHR offers all the typical possibilities of an electronic hitch control:
• The position control holds attached implements at the
preselected hitch height in every driving situation.
• The draft control maintains the required force constant for the implements working in the soil.
• The active ride control reduces the shaking of the tractor in transport mode.
• The pressure control meters the bearing pressure, e.g. of packer rollers, so that the soil can be compacted in the best possible manner.
• The external control enables the position of the implements attached to the hitch to be maintained with precision, by scanning the ground with a sensor.
• The mixed control guides the soil-working implements at the ideal working depth for the respective ground characteristics, in accordance with the set proportion of tractive effort and position.
• The slip control uses a radar sensor to record speed over the ground, and compares it with the drive speed. If these values differ, the implement is raised as accordingly, preventing wheel spin.
Relevant links for Tractors
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