Turning drive control apparatus and construction machine including the same

• US 8,473,165 B2
• Filed: 10/17/2008
• Issued: 06/25/2013
• Est. Priority Date: 10/18/2007
• Status: Expired due to Fees

• Current Assignee: Sumitomo Construction Machinery Sales Company Limited (Sumitomo Heavy Industries Limited), Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited, Sumitomo (S.H.I.) Construction Machinery Co., Ltd. (Sumitomo Heavy Industries Limited)
• Inventors: Nishiyama, Noriyuki, Sano, Kiminori, Shono, Hiroso
• Primary Examiner(s): Marc, McDieunel
• Application Number:
  US12/682,902
• Publication Number:
  US 20100222970A1
• Time in Patent Office: 1,712 Days
• Field of Search: 701/50, 318/24, 318/284, 318/468, 318/638, 318/561, 318/652, 318/461, 318/798, 180/65.21, 180/331
• US Class Current: 701/50
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: E02F 9/128 Braking systems
• CPC Class Codes: E02F 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: E02F 9/2246 Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A turning drive control apparatus that controls a drive of a turning mechanism of a construction machine driven to turn by an electric motor, includes: a drive command creation part that creates a drive command to drive the electric motor based on an amount of operation input through an operation part of the construction machine; a turning motion detection part that detects a turning motion of the turning mechanism; and a drive command correction part that corrects the drive command, when a turning motion in a direction opposite to a turning operation direction input to the operation part is detected by the turning motion detection part, to suppress the turning motion in the direction opposite to the turning operation direction in response to a degree of the turning motion in the direction opposite to the turning operation direction.

Claims

1. A turning drive control apparatus that controls a drive of a turning mechanism of a construction machine driven to turn by an electric motor, comprising:

a drive command creation part configured to create a drive command to drive said single electric motor based on an amount of operation input through an operation part of the construction machine;

a turning motion detection part configured to detect a turning motion of said turning mechanism; and

a drive command correction part configured to retain a plurality of different output characteristics corresponding to turning directions with respect to said single electric motor,

wherein said drive command correction part outputs a correction command based on one of the output characteristics to correct said drive command, when a turning motion in a direction opposite to a turning operation direction input to said operation part is detected by said turning operation direction in response to a degree of the turning motion in the direction opposite to the turning operation direction, and

wherein the output characteristics retained by said drive command correction part includes an output characteristic that maintains said drive command created by said drive command creation part when a turning direction input to said operation part is coincident with a turning direction detected by said turning motion detection part.

2. The turning drive control apparatus as claimed in claim 1, wherein said drive command correction part corrects said drive command based on a zero speed command to set a rotation speed of said electric motor to zero and a degree of the turning motion detected by said turning motion detection part.

3. The turning drive control apparatus as claimed in claim 2, wherein said drive command correction part is configured to compute a value of the drive command for correction based on a value of said zero speed command and a value representing the degree of the turning motion detected by said turning motion detection part in order to add the value of said drive command for correction to the value of the drive command created by said drive command creation part when a direction of the turning motion detected by said turning motion detection part is the direction opposite to said turning operation direction, and set the value of said drive command for correction added to the value of said drive command to zero when a direction of the turning motion detected by said turning motion detection part is coincident with said turning operation direction.

4. The turning drive control apparatus as claimed in claim 3, wherein a first control gain of said drive command correction part to compute a value of said drive command for correction is set larger than a second control gain of said drive command creation part to crate said drive command.

5. A construction machine comprising the turning drive control apparatus as claimed in claim 1.