SLIDING MODE CONTROL METHOD

Title:

SLIDING MODE CONTROL METHOD

Document Type and Number:

WIPO Patent Application WO/1991/005296

Kind Code:

A1

Abstract:

This invention relates to a sliding mode control method which can improve a property of a control system to follow up an instruction at the time of change of the operation conditions of a machine and can prevent vibration of the machine which is likely to occur due to the action of spring elements of the machine when the operating conditions change. A processor of a servo circuit calculates a position error (epsilon) and a speed error (epsilon) on the basis of an instructed position (r) and an actual position (), estimates a twist quantity (epsilonn) and a twist speed (epsilonn) by observer processing and calculates a switch plane (s) (102). The processor calculates each of the first to fourth terms of the switch quantity (T1) in accordance with the positive or negative and position error of the switch plane (s), the second order differentiation of the instructed position and one corresponding positive or negative of twist quantity and twist speed (103 ~ 129) and then calculates a torque instruction (T) sufficient to converge the switch plane to zero on the basis of the switch quantity obtained by adding these four terms (130, 131). Even when non-linear parameters associated with the spring elements of the machine change, the servo system follows up the change in an excellent way and prevents the vibration of the machine.

Inventors:

TORII NOBUTOSHI (JP)
NIGEI RYO (JP)
KATO TETSUAKI (JP)

Application Number:

PCT/JP1990/001187

Publication Date:

April 18, 1991

Filing Date:

September 17, 1990

Export Citation:

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Assignee:

FANUC LTD (JP)

International Classes:

B25J9/12; B25J9/18; G05B13/00; G05B13/04; G05B19/19; G05D3/12; (IPC1-7): G05D3/12

Foreign References:

JPS57185517A

1982-11-15

Other References: