| 摘要 |
<p>A torque control device for hydraulic pumps of hydraulic construction equipments, in which signals from sensors (75-82) are inputted when environmental change reduces an output of an engine, correction gain calculating units (70m-70u) and a torque correction value calculating unit (70v) estimate reduction in engine output as a torque correction value (ΔTFL), and a speed sensing torque deviation correction unit (70i) subtracts the torque correction value (ΔTFL) from a speed sensing torque deviation (ΔTI) and adds to a pump base torque (TRO) the thus subtracted torque deviation (ΔTNL) to find an absorption torque (TR1) (target maximum absorption torque) and output a signal to a solenoid control valve (32). The solenoid control valve (32) controls a servo valve (22) for total horse power control to control the maximum absorption torques for hydraulic pumps (1, 2). Accordingly, even when a prime mover output decreases, it is possible to minimize reduction in the number of revolutions of the prime mover during high loading.</p> |
