Steering system for trailers

摘要

A method of controlling a combination vehicle for road transport of heavy goods. It has a motor vehicle at the front and a trailer attached behind. The trailer comprises a semi-trailer body adapted to carry goods, a dolly mounted beneath the front of the semi-trailer body and connected to the semi-trailer body by a pivoting connection, said dolly comprising road wheels attached in one or more axle sets to a dolly frame, and a drawbar assembly connecting the dolly frame to a preceding vehicle unit by means of a trailer coupling assembly. The drawbar assembly defines an instant centre of rotation for the dolly which is located forwards of said trailer coupling assembly while the vehicle is moving forwards at high speeds, and which is located at least substantially at the trailer coupling assembly while the vehicle is moving forwards at low speeds.