Pressure limiting method for cylinder chamber of hydraulic actuator in steering system, involves controlling pressure prevailed in cylinder chambers to reference pressure, and providing safety valve in hydraulic system

摘要

The method involves controlling pressure prevailed in cylinder chambers (13, 13b) to a reference pressure. Capacity and delivery volume supplied to the cylinder chambers are reduced by a fluid pressure source. Hydraulic fluid is discharged from the cylinder chamber. A safety valve (21) provided in a hydraulic system (1) i.e. steering system, is opened. A fluid connection (29) is provided between the cylinder chambers. The pressure in the cylinder chambers is measured by pressure sensors (27a, 27b). An independent claim is also included for a hydraulic system comprising a hydraulic actuator.