Periodic disturbance automatic suppression device

Patent metadata

Field	Value
Publication number	US-9614474-B2
Application number	US-201314646976-A
Country	US
Kind code	B2
Filing date	Dec 5, 2013
Priority date	Dec 7, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

In suppression of torque ripple with a periodic disturbance observer, adjustment of a gain portion is determined sequentially during monitoring operation of monitoring an operating condition. Therefore, many adjusting parameters are involved and achievement of correction is dependent on the skill of a person in charge of adjustment or design. The periodic disturbance observer is provided with a model correcting means or section which calculates an error of an identification model by using a time difference quantity by an output of the periodic disturbance observer and a sensed value of a plant and corrects the identification model with the error of the identification model. Finally, the system performs the torque ripple suppression control with an accurately estimated periodic disturbance.

First claim

The invention claimed is:

1. A periodic disturbance automatic suppressing apparatus for calculating an estimated periodic disturbance by inputting an output of a controlled object producing periodic disturbance, into a periodic disturbance observer, and for controlling the controlled object in accordance with a difference between the estimated periodic disturbance and a control command,
the periodic disturbance automatic suppressing apparatus comprising a model correcting means provided for the periodic disturbance observer, the model correcting means being configured to calculate an error from a corrected identification model corrected by using a time difference quantity by an output of the periodic disturbance observer and a sensed value of the controlled object when the control command and the periodic disturbance are assumed to be constant during a predetermined time difference and to feed back the error from the corrected identification model into an identification model of the periodic disturbance observer.

2. The periodic disturbance automatic suppressing apparatus as recited in claim 1 , wherein the model correcting means is configured to determine an estimated system model P^^n estimated from the time difference quantity during a time difference t 1 ˜t 2 , according to a following equation by setting, as yn·t, an nth order output of the controlled object at an instant t, setting, as d^n·t, an nth order estimated periodic disturbance at the instant t, and setting, as y^n, an estimated plant output of the identification model P^n,

Pn
=

⁢

-

(

y
n

·

t
2

-

y
n

·

t
1

)

/

(

d
n
⋀

·

t
2

-

d
n
⋀

·

t
1

)

=

⁢

P

⋀
⋀

⁢
n

where Pn is a plant, and each quantity is a complex number.

3. The periodic disturbance automatic suppressing apparatus as recited in claim 1 , wherein the model correcting means is configured to determine an estimated identification model pref n·P^n estimated from the time difference quantity during a time difference t 1 ˜t 2 , according to a following equation by setting, as yn·t, an nth order output of the controlled object at an instant t, setting, as d^n·t, an nth order estimated periodic disturbance at the instant t, and setting, as y^n, an estimated plant output of the identification model P^n,

Pn
=

⁢

-

(

y
n

·

t
2

-

y
n

·

t
1

/

(

y
⋀

n

·

t
2

-

y
⋀

n

·

t
1

)

·

P
⋀

⁢
n

Assignees

• Meidensha Electric Mfg Co Ltd

Inventors

• Yamaguchi Takashi
• Tadano Yugo

Classifications

• G05B19/19 Primary

  characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path · CPC title

• H02P21/13 Primary

  Observer control, e.g. using Luenberger observers or Kalman filters · CPC title

• G05B2219/41132

  Motor ripple compensation · CPC title