We are developing Scarabaeus for the social enterprise Brüggli, whose industrial division is taking a big step towards the future with a new robotics department.

The entire system focuses on benefits, safety, energy efficiency and target costs. Efficient mowing between individual trees, on coarse ground and in all weather conditions pose high demands on both mechanics and systems technology which require specific solutions.

Scarabaeus works autonomously in orchards. For this, the users prepare a map with task areas which the robotic mower learns and refines for itself. We have developed an innovative navigation system from scratch. It allows orientation in the orchard without susceptible visual systems.

In addition to the code that runs on the robot itself, a backend and a software for the end user to control and plan the mowing are also necessary. We developed these elements closely coupled with the other topics in the project.

One requirement was autarchy in the field, using photovoltaics. Simulations showed us that a highly focused mowing strategy is needed to operate the unit with the available energy. Every physical factor comes into play and had to be optimized within the target costing: from the stiffness of the tracks to the control of the individual mowing motor windings.

This allows to achieve an area output of 8 ha in 2 weeks, which corresponds to a larger orchard.

Scarabaeus' Design is the origin of its name, but the bug-like shape is no mere marketing gimmick. In order to perform well, it has to crouch under the branches. Moreover, the design emphasises the character of Scarabaeus: robust, competent and friendly. The clear topology with the front mower and the chassis behind it makes for an ergonomic and safe product.