Patent ID: 8701401

Claim:
An engine control device comprising: a variable displacement hydraulic pump driven by an engine; a plurality of hydraulic actuators driven by a discharge pressure oil from the hydraulic pump; a plurality of control valves that control the discharge pressure oil from the hydraulic pump so that the discharge pressure oil is supplied to the plurality of hydraulic actuators; at least one operation lever that controls the plurality of control valves; a detector that detects a pump capacity of the hydraulic pump; a fuel injector that controls a fuel supplied to the engine; a command unit that selects a set command value among variable command values and commands the set command value; a first setting unit that sets a first target engine speed in response to the set command value commanded by the command unit and a second target engine speed based on the first target engine speed, the second target engine speed being lower than the first target engine speed; a second setting unit that sets a third target engine speed according to the pump capacity, the third target engine speed having the second target engine speed as a lower limit; and a controller that controls the fuel injector so as to provide the third target engine speed set by the second setting unit, wherein a reduction range from the first target engine speed to the second target engine speed is set in the first setting unit according to a type of the hydraulic actuator operated by the at least one operation lever or a combination of the plurality of hydraulic actuators operated by the at least one operation lever.