HYDRAULIC ACTUATING SYSTEM AND CONTROL METHOD

摘要

The invention relates to an hydraulic actuating system comprising two cylinders and to a method of controlling such an hydraulic actuating system. The invention is based on the connection to tank of the chambers of the cylinders passing through dead zones. This tank connection is brought about by the opening of the braking valves of the cylinder passing through the dead zone and the connecting to tank of the two chambers thereof by means of the electrovalve thereof. In the tank, the pressure is zero and therefore no undesired loads are exerted on the mechanism during passage through the dead zones, thus avoiding the problem of overpressure being generated in the hydraulic actuating system when a piston passes through dead centre.