Control device and control method for construction machine
First Claim
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1. A control device for a construction machine, the control device comprising:
- an electronic joystick configured to generate a request signal for operation of a working device;
a main controller configured to receive the request signal and generate a torque command and a pilot signal;
an engine control unit configured to receive the torque command and generate an engine revolutions-per-minute (RPM) command;
an engine configured to be operated in compliance with the engine RPM command;
a hydraulic motor/pump configured to be operated by the engine and discharge a working fluid or to be driven by an entering working fluid and output power;
an auxiliary power device additionally installed on the engine or hydraulic motor/pump, and configured to provide auxiliary power to the engine or hydraulic motor/pump; and
an engine load device including an air conditioner compressor configured to be powered by the engine;
wherein when the auxiliary rower is provided from the auxiliary power device, the main controller or engine control unit controls the engine RPM of the engine to be lowered to a first engine RPM adapted for the maintenance of the engine in an ON state.
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Abstract
The present invention relates to a control device and control method for a construction machine. A control device and control method for a construction machine according to the embodiments of the present invention can determine a need for the operation of the alternator by taking into account required electrical energy and the current charge amount of a battery when auxiliary power is received from the auxiliary power device, and can thus decrease an engine RPM in a situation in which power generation is not required, thereby improving the fuel efficiency of a construction machine.
4 Citations
16 Claims
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1. A control device for a construction machine, the control device comprising:
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an electronic joystick configured to generate a request signal for operation of a working device; a main controller configured to receive the request signal and generate a torque command and a pilot signal; an engine control unit configured to receive the torque command and generate an engine revolutions-per-minute (RPM) command; an engine configured to be operated in compliance with the engine RPM command; a hydraulic motor/pump configured to be operated by the engine and discharge a working fluid or to be driven by an entering working fluid and output power; an auxiliary power device additionally installed on the engine or hydraulic motor/pump, and configured to provide auxiliary power to the engine or hydraulic motor/pump; and an engine load device including an air conditioner compressor configured to be powered by the engine; wherein when the auxiliary rower is provided from the auxiliary power device, the main controller or engine control unit controls the engine RPM of the engine to be lowered to a first engine RPM adapted for the maintenance of the engine in an ON state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control method for a construction machine, the control method controlling an engine and a hydraulic motor/pump configured to be operated by the engine, the control method comprising:
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determining whether an engine load device including an air conditioner compressor power as a load on the engine; determining whether an auxiliary power device additionally installed on the engine or hydraulic motor/pump provides auxiliary power; and adjusting an engine RPM of the engine based on whether the engine load device operates and whether the auxiliary power device provides auxiliary power, wherein when the auxiliary power is provided from the auxiliary power device, the engine RPM of the engine is adjusted to be lowered to a first engine RPM that maintains the engine in an ON state. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A control device for a construction machine, the control device comprising:
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an electronic joystick configured to generate a request signal for operation of a working device; a main controller configured to receive the request signal and generate a torque command and a pilot signal; an engine control unit configured to receive the torque command and generate an engine revolutions-per-minute (RPM) command; an engine configured to be operated in compliance with the engine RPM command; a hydraulic motor/pump configured to be operated by the engine and discharge a working fluid or to be driven by an entering working fluid and output power; a main control valve controller configured to control an electronic proportional control valve which receives the pilot signal and controls the working device; an intelligent battery sensor configured to detect a charge amount of a battery; an auxiliary power device additionally installed on the engine or hydraulic motor/pump, and configured to provide auxiliary power to the engine or hydraulic motor/pump; and an engine load device configured to operate as a load on the engine; wherein the main controller or engine control unit adjusts the engine RPM based on whether the engine load device operates or not and whether the auxiliary power is provided from the auxiliary power device or not, the engine control unit generates the engine RPM command based on one of a first engine RPM adapted for maintenance of the engine in an ON state, a second engine RPM adapted for power generation of an alternator, and a third engine RPM adapted for operation of a compressor of an air conditioner, the auxiliary power is divided into a first power range, a second power range, and a third power range based on maximum capacity and minimum capacity which can be output from the auxiliary power device, and when the engine load device has been turned on and the auxiliary power to be provided to the engine or hydraulic motor/pump corresponds to the first power range, the engine control unit changes the engine RPM to the first engine RPM, and the auxiliary power device is operated in the first power range.
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16. A control method for a construction machine, the control method controlling an engine and a hydraulic motor/pump configured to be operated by the engine, the control method comprising:
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determining whether an engine load device operating as a load on the engine operates; determining whether an auxiliary power device additionally installed on the engine or hydraulic motor/pump provides auxiliary power; and adjusting an engine RPM of the engine based on whether the engine load device operates and whether the auxiliary power device provides auxiliary power, wherein the engine RPM is divided into and set to a first engine RPM adapted for maintenance of the engine in an ON state, a second engine RPM adapted for power generation of an alternator, and a third engine RPM adapted for operation of a compressor of an air conditioner, the auxiliary power is divided into a first power range, a second power range, and a third power range based on maximum capacity and minimum capacity which can be output from the auxiliary power device, and when the engine load device has been turned on and the auxiliary power to be provided to the engine or hydraulic motor/pump corresponds to the first power range, the engine RPM is changed to the first engine RPM, and the auxiliary power device is operated in the first power range.
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Specification