| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately control the total suction torque of first, second and third hydraulic pumps and to effectively utilize output torque of an engine in a torque control device of a three-pump system for a construction machine. <P>SOLUTION: Pump base torque Tr is calculated from the target revolution number by a pump base torque operation part 42 and third pump reference suction torque T3r is subtracted from the pump base torque Tr by a reduction part 44 to calculate a reference value Tf of the maximum suction torque usable in the first and second hydraulic pumps 2, 3. A correction torque value is calculated from a delivery pressure of the third hydraulic pump 4 by a correction torque operation part 45, the correction torque value Tm is added to the reference value Tf by an addition part 46 to calculate the target absorption torque Tn, and a first regulator 31 is controlled so as to obtain the target absorption torque Tn. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
