Robot Homing via Boundary and Reference Wire Guidance

A reference wire is introduced as an intermediary element between the boundary wire and the charging station. The reference wire extends from the charging station toward the boundary wire, creating a magnetic field that serves as a directional guide. This intermediary structure enables the robot to detect the charging station's location more directly without having to traverse the entire boundary perimeter, thereby reducing travel distance and battery consumption.

The patent introduces dynamic routing capability where the robot can choose between multiple paths to reach the charging station. By detecting the reference wire's magnetic field, the robot dynamically selects a direct path through the interior area rather than statically following the boundary wire. This dynamic path selection eliminates repeated traversal of the same ground location, preventing rut formation and ground damage.

The patent makes the existing boundary wire detector serve multiple functions. Instead of adding a separate sensor system for charging station detection, the invention enables the boundary wire detector to also detect the reference wire's magnetic field. This multi-functionality allows the robot to use the same sensor hardware for both boundary following and charging station location, eliminating the need for additional sensors and reducing system complexity.

The existing boundary wire detector is made multi-functional to detect both boundary wires and the reference wire using the same sensor and processing hardware. By reusing the existing detection system rather than adding new sensors, the patent eliminates the additional power consumption that would result from extra sensor operations and data processing, thereby preserving battery life while achieving accurate charging station location.