APPARATUS FOR SUPPRESSING LAG-DOWN OF ENGINE FOR CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To provide an apparatus for suppressing lag-down of an engine for a construction machine, suppressing to a low level the lag-down of the engine after lapse of a predetermined holding time to hold at a low pump torque when an operation device is operated from a non-operated state.

SOLUTION: This apparatus is provided with a vehicle body controller 13, a solenoid valve 16, etc. The vehicle body controller composes a first torque control means for controlling a torque control valve 7 so as to obtain the minimum pump torque (value: Min) corresponding to a target engine speed Nr when the non-operated state of the operation device 5 is passed through a monitoring time TX1, and a second torque control means for controlling the torque control valve 7 so as to keep the minimum pump torque for a predetermined holding time TX2 after operating the operation device 5 from the non-operated state. The apparatus is also provided with a third torque control means for controlling the torque control valve 7 so as to gradually increase the pump torque based on a predetermined increased torque rate K according to a lapse of time from a point of time of the lapse of the predetermined holding time TX2.

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