Komatsu Corporation

Masaru Shizume

Yukio Sugano

Kyouji Uranaka

Yasuhiro Kamoshida

Tsubasa Ohira

Tomotaka Imai

An engine control device of a work machine controls an internal-combustion engine of the work machine including a swing body, an implement attached to the swing body, a hydraulic actuator that operates the implement, a hydraulic pump that operates the hydraulic actuator, and the internal-combustion engine that drives the hydraulic pump and of which a rotation speed is changed according to a load. The engine control device of the work machine includes: a determination unit configured to determine whether a condition not requiring work with the implement is established; and an engine control unit configured to enable control at relief time of determining a target rotation speed targeted by the internal-combustion engine based on horsepower sucked by the hydraulic pump of when a hydraulic oil ejected by the hydraulic pump is relieved when the condition is established, and disables the control at relief time when the condition is not established.

Engine control device of work machine, work machine, and engine control method of work machine

The gross output power of an engine distributed to at least one main machine and one auxiliary machine. A total load value calculation unit calculates the value of the lost power consumed by the auxiliary machine, and calculates the value of total load power by adding to this lost power value a target value for the main output power of the engine to be distributed to the main machine. A gross output value control unit controls the value of the gross output power so that the value of the gross output power becomes equal to the value of the total load power when the value of the total load power is less than a predetermined threshold value, and so that the value of the gross output power becomes equal to the above described threshold value when the value of the total load power is greater than the threshold value.

Engine output control device

A rotation control system of a hoist pump includes: the hoist pump (); an engine () for driving the hoist pump (); a working equipment driven by a hydraulic cylinder that is extendable by hydraulic oil delivered through the hoist pump (); a hydraulic oil tank that stores the hydraulic oil supplied to the hoist pump () and receives the hydraulic oil returned from the hydraulic cylinder; and a controller () that controls a rotation speed of the hoist pump () to be an allowable rotation speed that is set in advance for preventing cavitation while the hydraulic cylinder is operated.

Rotation control system for working-machine pump

A gear change control device and a method for a work vehicle for reducing a heat quantity generated by gear shift clutches of a transmission and a gear shift shock to reduce a load on the clutches without inducing elongation of a cycle time or deterioration of a work efficiency. A clutch pressure (Pm) of an input clutch() is reduced to switch from a connected state to a power-transmittable sliding state at a time (tE) after a time (tA) at which a cut-off operation of a gear shift clutch used before gear shifting (reverse clutch) is started and before a time (tD) at which the connecting operation of a selected gear shift clutch to be used after the gear shifting (forward clutch) is completed.

Gear change control device and gear shift control method for work vehicle

A controller serving as determination device determines whether or not a rising speed of the clutch pressure of the input clutch is less than a limit rising speed of the original pressure. A controller serving as original pressure control device adjusts the original pressure such that a difference between the original pressure and the detected clutch pressure of the input clutch becomes a predetermined offset pressure when it is determined that the clutch pressure rising speed of the input clutch is less than the original pressure limit rising speed, and adjusts the original pressure such that the original pressure is raised at the original pressure limit rising speed when it is determined that the clutch pressure rising speed of the input clutch is equal to or higher than the original pressure limit rising speed.

Growing community of inventors

Mooka, Japan

Masaru Shizume