Portable electronic device for changing trailer height using the pneumatic suspension

摘要

A trailer vehicle function control system comprising an electronic control unit provided with a standards compliant communications interface. The communications interface is adapted to communicate wirelessly with a remote electronic device adapted to actuate control of functions on the trailer. In use, the electronic control unit is adapted in a first step to transmit a signal at a first strength and the electronic device is adapted to measure the signal strength of signals received from the electronic control device and to return the measured signal strength. The electronic control unit compares the transmitted signal strength with the signal strength of the signal received from the electronic device and then determines a value for the proximity of the electronic device based on the difference between the transmitted and received signal strengths.