| 摘要 |
A control system (100) for a hybrid construction machine, said control system being equipped with: a first and a second main pump (MP1, MP2) that supply operating oil; a boom cylinder (BC), which extends and thereby raises a boom when operating oil is supplied to a piston-side chamber (25), and which contracts and thereby lowers the boom when operating oil is discharged from the piston-side chamber (25); a regenerative control spool valve (26), which is controlled by the pressure of pilot pressure oil, and adjusts the flow volume of the operating oil discharged from the piston-side chamber (25); a regenerative motor (M) for regeneration use, which is rotated by operating oil discharged from the piston-side chamber (25); a rotating electric machine (35) connected to the regenerative motor (M); and a failsafe switching valve (60) which is switched by using, as a pilot pressure, the pressure in a regeneration passage (27a) between the regeneration control spool valve (26) and the regenerative motor (M), and which, when the pressure in the regeneration passage (27a) is less than a set pressure, reduces the pressure of the pilot pressure oil supplied to the regenerative control spool valve (26) so as to restrict the flow volume of the operating oil discharged from the piston-side chamber (25). |
