ENGINE CONTROL DEVICE FOR CONSTRUCTION MACHINE

摘要

[PROBLEMS] An engine control device for a construction machine can decrease consumption of energy required to reduce engine lag down occurring in a sharp rise in load involved in abrupt operation etc. of an operation device. [MEANS FOR SOLVING PROBLEMS] The engine control device includes load condition detection means having an operation amount detector (10) for detecting that the operation device (5) is fully operated and also having a first calculation section (9a) for a controller (9), charge amount detection means capable of detecting the amount of charge on a capacitor (8), and a supercharge pressure detector (10). The engine control device further has determination processing means including a determination processing section (9c) for the controller (9). When the load condition detection means detects that absorption torque of a pump (3) exceeds output torque of the engine due to operation of the operation device (5), if it is determined that supercharge pressure detected by the supercharge pressure detector (10) is not more than a predetermined pressure and at the same time if it is determined that the amount of charge on the capacitor (8) detected by the charge amount detection means is the amount capable of driving an electric motor (2) for a predetermined time (A), the determination processing section (9c) performs processing for causing electric power of the capacitor (8) to be supplied to the electric motor (2).