SWING CONTROL SYSTEM AND METHOD FOR CONSTRUCTION MACHINE USING ELECTRIC MOTOR
First Claim
1. A swing control system for construction machine including a swing electric motor swinging an swing structure and a swing control unit, wherein the swing control unit comprises:
- reference speed calculation means for calculating a reference swing speed and a maximum acceleration according to a manipulation signal of a control lever for a swing manipulation;
a swing speed determination means for calculating a first speed change amount from a difference between the reference swing speed and an actual swing speed by the electric motor that is currently fed back, calculating a second speed change amount for a sampling time from the maximum acceleration, and determining a swing speed according to the manipulation signal by comparing the first speed change amount and the second speed change amount and adding a smaller amount between the first speed change amount and the second speed change amount obtained as the result of comparison to the actual swing speed currently fed back; and
an output torque control means for controlling an output torque of the electric motor by generating a control signal for the determined swing speed.
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Accused Products
Abstract
A swing control system and method for a construction machine using an electric motor is provided. The swing control system includes a swing electric motor swinging an upper swing structure and a swing control unit. The swing control unit includes a reference speed calculation means for calculating a reference swing speed and a maximum acceleration according to a manipulation signal of a control lever for a swing manipulation; a swing speed determination means for calculating a first speed change amount from a difference between the reference swing speed and an actual swing speed by the electric motor that is currently fed back, calculating a second speed change amount for a sampling time from the maximum acceleration, and determining a swing speed according to the manipulation signal by comparing the first speed change amount and the second speed change amount and adding a smaller amount between the first speed change amount and the second speed change amount obtained as the result of comparison to the actual swing speed currently fed back; and an output torque control means for controlling an output torque of the electric motor by generating a control signal for the determined swing speed.
63 Citations
13 Claims
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1. A swing control system for construction machine including a swing electric motor swinging an swing structure and a swing control unit, wherein the swing control unit comprises:
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reference speed calculation means for calculating a reference swing speed and a maximum acceleration according to a manipulation signal of a control lever for a swing manipulation; a swing speed determination means for calculating a first speed change amount from a difference between the reference swing speed and an actual swing speed by the electric motor that is currently fed back, calculating a second speed change amount for a sampling time from the maximum acceleration, and determining a swing speed according to the manipulation signal by comparing the first speed change amount and the second speed change amount and adding a smaller amount between the first speed change amount and the second speed change amount obtained as the result of comparison to the actual swing speed currently fed back; and an output torque control means for controlling an output torque of the electric motor by generating a control signal for the determined swing speed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A swing control method for a construction machine for swinging an upper swing structure using a swing electric motor, comprising:
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a reference speed calculation step of calculating a reference swing speed and a maximum acceleration according to a manipulation signal of a control lever for a swing manipulation; a swing speed change amount calculation step of receiving a feedback of an actual swing speed by the electric motor, calculating a first speed change amount from a difference between the actual swing speed currently fed back and the reference swing speed, and calculating a second speed change amount for a sampling time from the maximum acceleration; a swing speed determination step of determining a swing speed according to the manipulation signal by comparing the first speed change amount and the second speed change amount and adding a smaller amount between the first speed change amount and the second speed change amount obtained as the result of comparison to the actual swing speed currently fed back; and an output torque control step of controlling an output torque of the electric motor by generating a control signal for the determined swing speed. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification