HYDRAULIC SUSPENSION DEVICE

摘要

PURPOSE:To attempt the stabilization in attitude even under unusual conditions by enclosing fluid pressure within suspension units based on the detected signal on unusual conditions of a pressure control valve in the title device controlling the attitude by means of car height adjustment. CONSTITUTION:The actual output of fluid pressure Ps is inputted into a controller from each pressure sensor 46. As a result, if pressure control valves 20a-20d become unusual in operation, there causes the deviation between the fluid pressure Ps inputted from the aforesaid pressure sensor and the output pressure Pg operated by the controller. Unusual conditions are distinguished by the aforesaid deviation so as to output enclosing command signals S1 and S2 to an unloader valve 63 and a cut valve 64 for suspending the output of a pressure control valve signal Ci concurrently. This causes a fluid relief circuit 62 to be opened so as to releave the internal pressure of accumulators 105 and 106 for letting a check valve 61 be closed while being accompanied with the closing of a drain circuit 63 so that all units 10a-10d are equalized in pressure to stabilize the attitude accordingly, thereby enabling the stabilization in attitude even under unusual conditions.