Komatsu Corporation

Takao Suehiro

Tadashi Kawaguchi

Jun Morinaga

Mitsuhiko Kamado

Kentaro Murakami

Kouji Ohhigashi

An engine control device is provided including: detection units for detecting a driving state of a work machine using a generator, target engine speed setting units for causing, on the basis of the driving state, a target engine speed set for a case where electric power generation by the generator is OFF to be the same as a target engine speed set for a case where the electric power generation by the generator is ON, and engine target output calculation units for calculating an engine target output during electric power generation OFF that can be output at most when the electric power generation by the generator is OFF, and calculates an engine target output obtained by adding an output corresponding to an electric power generation amount by the generator to the engine target output when the electric power generation by the generator is ON.

Engine control device of work machine and engine control method therefor

In a hydraulic excavator, a controller is configured to control output of an engine based on a first engine output torque line that defines an upper limit for engine output torque against engine rotation rate. The controller is configured to determine which of two operations, a high hydraulic load operation in which a work machine is subjected to a high hydraulic load and a low hydraulic load operation in which the work machine is subjected to a low hydraulic load, is being performed. When swinging for a revolving unit and the low hydraulic load operation for the work machine are being performed as a combined operation, the controller is configured to control the output of the engine based on a second engine output torque line. The second engine output torque line is an engine output torque line with a lower engine output torque than the first engine output torque line.

Growing community of inventors

Hiratsuka, Japan

Takao Suehiro