Control apparatus for work machine
First Claim
1. A control apparatus for a work machine comprising:
- a hydraulic pump which is driven by an engine;
a hydraulic actuator to which pressurized oil is supplied, the pressurized oil being discharged from the hydraulic pump;
a generator motor which is coupled to an output shaft of the engine;
a storage device which accumulates electric power generated by the generator motor and supplies electric power to the generator motor;
an electric actuator which is driven by the electric power generated by the generator motor and/or the electric power accumulated in the storage device;
a determination unit which determines whether or not the hydraulic actuator and the electric actuator are concurrently actuated; and
a control unit for restricting a torque or a speed of the electric actuator when the determination unit determines that the hydraulic actuator and the electric actuator are concurrently actuated.
1 Assignment
0 Petitions
Accused Products
Abstract
A speed of a hydraulic actuator is matched with that of an electric actuator when the hydraulic actuator and the electric actuator are concurrently actuated. When determination units (71, 72) determine that a boom hydraulic cylinder (31) and a rotation generator motor (11) are concurrently actuated based on a controlled variable of a boom control lever (41) and a controlled variable of a rotation control lever (42), a torque of the rotation generator motor (11) is restricted based on a pump discharge pressure (Pp). Therefore, for example, a torque limit command is generated and output such that a torque limit value (TL2) of the rotation generator motor (11) is decreased with a decrease in discharge pressure (Pp) of a hydraulic pump (3).
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Citations
6 Claims
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1. A control apparatus for a work machine comprising:
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a hydraulic pump which is driven by an engine; a hydraulic actuator to which pressurized oil is supplied, the pressurized oil being discharged from the hydraulic pump; a generator motor which is coupled to an output shaft of the engine; a storage device which accumulates electric power generated by the generator motor and supplies electric power to the generator motor; an electric actuator which is driven by the electric power generated by the generator motor and/or the electric power accumulated in the storage device; a determination unit which determines whether or not the hydraulic actuator and the electric actuator are concurrently actuated; and a control unit for restricting a torque or a speed of the electric actuator when the determination unit determines that the hydraulic actuator and the electric actuator are concurrently actuated. - View Dependent Claims (2, 3, 4)
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5. A control apparatus for a work machine comprising:
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a hydraulic pump which is driven by an engine; a hydraulic actuator to which pressurized oil is supplied, the pressurized oil being discharged from the hydraulic pump; a generator motor which is coupled to an output shaft of the engine; a storage device which accumulates electric power generated by the generator motor and supplies electric power to the generator motor; an electric actuator which is driven by the electric power generated by the generator motor and/or the electric power accumulated in the storage device; and a control unit for restricting load of the hydraulic pump such that the load of the hydraulic pump is decreased as power of the electric actuator is increased.
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6. A control apparatus for a work machine comprising:
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a hydraulic pump which is driven by an engine; a hydraulic actuator to which pressurized oil is supplied, the pressurized oil being discharged from the hydraulic pump; a generator motor which is coupled to an output shaft of the engine; a storage device which accumulates electric power generated by the generator motor and supplies electric power to the generator motor; an electric actuator which is driven by the electric power generated by the generator motor and/or the electric power accumulated in the storage device; a determination unit which determines whether or not the hydraulic actuator and the electric actuator are concurrently actuated; a first control unit which restricts a torque or a speed of the electric actuator when the determination unit determines that the hydraulic actuator and the electric actuator are concurrently actuated; and a second control unit for restricting load of the hydraulic pump such that the load of the hydraulic pump is decreased as power of the electric actuator is increased.
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Specification