Patent ID: 9212469
Filing Date: 2015-12-15
Classification: B60L,E02F,Y02T

Abstract:
1. A work machine comprising: an engine; a hydraulic pump driven by the engine; a hydraulic actuator driven by hydraulic fluid delivered by the hydraulic pump; an electric actuator driven electrically; a first operating device which operates the hydraulic actuator; a second operating device which operates the electric actuator, and a control device configured to calculate a target speed of the electric actuator in accordance with an operation amount of the second operating device, calculate a speed limit value of the electric actuator by correcting the target speed in accordance with an operation amount of the first operating device, calculate a torque limit value in accordance with the operation amount of the first operation device, the torque limit value used as a maximum torque of the electric actuator during the operation of the electric actuator, control a torque generated by the electric actuator to be lower than the torque limit value, and control a speed of the electric actuator to be lower than the speed limit value, wherein the control device is further configured to calculate a power required to drive the hydraulic actuator in accordance with the operation amount of the first operating device, calculate a power limit value in accordance with the power required to drive the hydraulic actuator, the power limit value capable of being supplied to the electric actuator for driving the electric actuator, select the smaller of the torque limit value and a torque resulting from torque conversion of the power limit value, generate a torque command for the electric actuator in accordance with the selected value, and output the torque command to the electric actuator.