• Subsystems: Additional and auxiliary steering
  • Additional steering


AXS (auxiliary steering system) enables control of one or two auxiliary steering axles via electro-hydraulic proportional valves. Depending on the machine’s specific electronics architecture, the software is available as an individual application on controllers HY-TTC 90CM and HY-TTC 32S or as a library module on an HY-TTC 580.

The current steering angle is detected by means of the reference axle (generally the main steering axle) and the target angle for the auxiliary steering axle(s) is calculated on the basis of the set steering type and the selected steering mode.

The auxiliary steering axles are adjusted/moved to the target position electro-hydraulically. Position and/or angle sensors are needed to detect the current position at each axle.

Advantages of AXS auxiliary steering

  • Various steering modes and operating modes
  • Steering characteristics can be parameterized
  • Different “safe states” can be selected: no requirements, locking, releasing or forced centering.
  • Different release functionalities
  • Increased number of controlled auxiliary steering axles: multiple controllers (e.g. HY-TTC 32S) can be combined to form one overall control system
  • Very good system diagnosis and error identification through permanent monitoring functions and start-up check
  • Speed- and/or vehicle-state-based (e.g. on-road) blockage of mode change (safety function)
  • Filter clogging and oil level sensors can be integrated
  • DM1 protocol available; error lamps can be depicted

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TÜV-certified software suite for the development and maintenance of control software for mobile machinery. Functional safety is included.
Solutions for electro-hydraulic machine controls, extensively tested. Functionally safe up to safety levels PL d and AgPL d (SRL 2).
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