ENGINE CONTROL DEVICE FOR HYBRID CONSTRUCTION MACHINERY

摘要

The present disclosure relates to an engine control device for hybrid construction machinery, and more particularly, and an object of the present disclosure is to, in a hybrid excavator, in which a swing apparatus is electrically driven by being separated from a hydraulic power train system in the related art, satisfy a minimum rotational speed of an engine auxiliary motor which is necessary to satisfy a target charging amount required for an energy storage device, and improve fuel efficiency by removing unnecessary energy loss at low loads by controlling a rotational speed of an engine to be lower than a rotational speed of an engine determined based on a dial input and a mode input in the related art, in a case where a target power generation amount of the engine auxiliary motor is small in a low-load work situation.

主权项

1. An engine control device for hybrid construction machinery which includes an engine, an engine auxiliary motor, an energy storage device, a swing motor, and a pump operating an operator, which performs work other than a swing operation, by using driving power of the engine, the engine control device comprising:
a first target engine rotational speed calculation unit configured to calculate a first target engine rotational speed of the engine based on a dial input value and a work mode input value which are information about the rotational speed of the engine; a second target engine rotational speed calculation unit configured to calculate a second target rotational speed of the engine based on a target power generation amount of the engine auxiliary motor; and an engine speed calculation unit configured to compare a calculation value of the calculated first target engine rotational speed and a calculation value of the calculated second target engine rotational speed, and determine a minimum value as a final target engine rotational speed.