WO2009110368A1 - 移動体のフィードフォワード制御方法 - Google Patents
移動体のフィードフォワード制御方法 Download PDFInfo
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- WO2009110368A1 WO2009110368A1 PCT/JP2009/053527 JP2009053527W WO2009110368A1 WO 2009110368 A1 WO2009110368 A1 WO 2009110368A1 JP 2009053527 W JP2009053527 W JP 2009053527W WO 2009110368 A1 WO2009110368 A1 WO 2009110368A1
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- impulse response
- finite impulse
- specific frequency
- moving body
- feedforward control
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/43—Speed, acceleration, deceleration control ADC
- G05B2219/43178—Filter resonance frequency from acceleration pattern, derive new speed pattern
Definitions
- the present invention relates to a feedforward control method for a moving body that is executed in order to quickly move a load, which is a moving body, to a target position by driving a motor, for example.
- a method of configuring a two-degree-of-freedom control method in which a feedforward control method is applied to a feedback control system is generally used.
- a feedforward control method for a mechatronic device having a higher order resonance mode requires a technique for reaching the target position by the required target positioning time without exciting the higher order vibration mode.
- Japanese Patent Application Laid-Open No. 2001-249702 discloses a method of using a reverse trajectory design by multirate control input period and a target trajectory design considering vibration control.
- a positioning control device for a moving body when performing a positioning operation in a frequency band near the resonance vibration, it is essential to generate a control input that suppresses the resonance frequency and the high frequency component.
- this method since it is necessary to design a target trajectory in advance, there is a problem that a free target trajectory cannot be given and is not practical.
- Japanese Patent Application Laid-Open No. 08-255023, Japanese Patent Application Laid-Open No. 2007-200463 and Japanese Patent Application Laid-Open No. 2004-272883 propose a method of performing a feedforward control by inputting a position command trajectory into a digital filter. .
- Japanese Patent Laid-Open No. 08-255023 by determining the coefficient of the digital filter polynomial by minimizing the evaluation function, the convergence to the target position is accelerated, and the transient response is improved. It is disclosed to shorten the positioning time.
- the present invention has been made in view of the above-described conventional circumstances, and is a feedforward control method that can cope with a free position command trajectory and that causes a position detection signal to reach a target position with a set number of steps. provide.
- the invention described in claim 1 is applied to positioning control for positioning the movable body (5) in the controlled object (2 to 5) at the target position, and is a finite impulse response filter (Nf (z)).
- / Z n feedforward for calculating a control input (U (z)) of feedforward control to the moving body (5) by inputting a position command (Rc (z)) to a digital filter composed of
- the numerator polynomial (Nf (z)) of the finite impulse response filter (Nf (z) / Z n ) is the denominator polynomial (D (z)) of the transfer function model of the discrete time system to be controlled (2 to 5).
- a feedforward control input (U (z)) that suppresses gain at a high frequency component, a specific frequency, or a specific frequency width can be calculated by issuing a position command (Rc (z)). For this reason, resonance vibration can be suppressed, and after the position command (Rc (z)) reaches the target position, the movable body (5) can also reach the target position with the set number of steps. Therefore, high-speed and high-precision positioning can be performed by suppressing the resonance mode of the mechanism having the moving body (5), and feedforward control that satisfies the target positioning time given to various operation patterns can be executed. it can.
- the resonance vibration of the controlled object is generated at the specific frequency.
- the resonance frequency may be within a range of ⁇ 10%.
- the evaluation function (J is calculated by substituting the specific frequency for the function expressed by the square of the gain characteristic of the finite impulse response digital filter (Nf (z) / Z n ).
- Q positive definite matrix
- Qfk weighting matrix
- the evaluation function (J) is obtained by integrating a function represented by the square of the gain characteristic of the finite impulse response digital filter (Nf (z) / Z n ) in a specific frequency band.
- a weight matrix (Qfk) that suppresses a specific frequency in the positive definite matrix (Q) can be obtained.
- FIG. 2 is a block diagram showing the control target shown in FIG. 1 in a discrete time system.
- FIG. 3 is a block diagram showing a control object of the discrete time system shown in FIG. 2 in a continuous time system. It is the figure which showed the frequency response of transfer function P (s). It is the block diagram which showed the outline
- a finite impulse response filter Nf (z) / Z n is a diagram showing a frequency response when a digital filter. It is a timing chart which shows the waveform of control input U (z) in feedforward control.
- FIG. 1 is a block diagram of a control system that executes the feedforward control method according to the present embodiment.
- the current is supplied to the motor 4 through the power amplifier 3 including current control.
- the load 5 is driven by rotating the motor 4 and the positioning operation of the load 5, for example, the adjustment of the angle of the load 5 accompanying the rotation of the motor 4 and the rotation of the motor 4 are converted into axial movement. Adjustment of the position in the axial direction is performed. That is, in this embodiment, the load 5 is used as a moving body, and positioning control of the moving body to a target position is performed. In this control, a mechanism having a moving body is used so that high-speed and high-precision positioning can be performed.
- the feedforward control is performed to suppress the resonance mode and satisfy the target positioning time given to various operation patterns.
- the actual output current is changed after the position command reaches the target position by controlling the resonance vibration. Feed-forward control is performed so that the target position is reached in the set positioning time.
- the rotation of the motor 4 is controlled by outputting an instruction current from the microcomputer 1.
- the instruction current that can be output from the microcomputer 1 is a control period (calculation period) in the microcomputer 1. It can only be changed every time. That is, when the microcomputer 1 is included in the system, it becomes a discrete time system, and in order to express it, it is expressed by Z conversion.
- the current can be expressed as a control input U (z) and a position detection signal Y (z) of the load 5, and these transfer functions can be expressed as P (z). This is expressed as a conceptual diagram of a configuration as shown in FIG.
- control input U (z) expressed in a discrete time system is zero-order held by the D / A converter 2 having a predetermined sampling period (for example, 50 ⁇ s), it is expressed as the control input U (s) in the s region.
- the position detection signal Y (s) is generated by the transfer function P (s) and this position detection signal Y (s) is sampled at a predetermined period by the sampler 6, the position detection signal Y (z) after z conversion is obtained. Corresponds to what is represented.
- the transfer function P (s) from the control input U (s) to the position detection signal Y (s) is expressed by the following equation.
- the frequency response of the transfer function P (s) is as shown in FIG.
- a digital filter for performing feedforward control compensation is designed so that the position command trajectory reaches the target position by the number of steps of the digital filter.
- FIG. 5 is a block diagram showing an overview of overall control in the control system of the present embodiment.
- the control input U (z) of the feedforward control is expressed by using a free position command rc and a digital filter, and the control form is also in consideration of feedback control compensation in practical use.
- a method for deriving a feedforward control law in a digital filter will be described.
- the position detection signal Y (z) is represented by the control input U (z) using the transfer function P (z) by z conversion, and further, the fraction having the transfer function P (z). Therefore, it can be expressed as Equation 2.
- N (z) and D (z) represent the numerator and denominator of the transfer function P (z), and since the numerator and denominator are both expressed by polynomials, N (z) and D (z) (Z) represents a numerator polynomial and D (z) represents a denominator polynomial.
- Equation 3 is position command Rc of the control input U feedforward control (z) any position command rc (z), and a finite impulse response filter Nf (z) / Z n .
- the arbitrary position command rc means a value calculated before feed-forward control compensation or the like in the upper hierarchy.
- a control input U (z) is calculated by performing feedforward control compensation or feedback control compensation on the command rc. This arbitrary position command rc varies depending on the form of the control system.
- Finite impulse response filter Nf (z) / Z n shown in this equation 3 is intended to determine the feedforward control law in the digital filter.
- the derivation of the finite impulse response filter Nf (z) / Z n are performed as follows.
- Nf (z) a denominator polynomial D (N (z) / D (z) corresponding to a transfer function P (z) of a discrete time system is added to Nf (z) which is a numerator polynomial of a finite impulse response filter Nf (z) / Z n. If all the roots of z) are included, the numerator polynomial Nf (z) is expressed as Equation 4. In this equation, N′f (z) represents an unknown polynomial.
- the position detection signal Y (z) is set to the target position in n steps corresponding to the order of Nf (z) / z n.
- the same constraint expression expressed by substituting the root ⁇ x into Equation 8 is 1 Derived. Therefore, when the root ⁇ x of the multiplicity 1 is included in the root of the denominator polynomial D (z), the constraint expression represented by the differential value of Expression 8 is used instead. That is, if there are no constraint equations corresponding to the number of variables to be obtained, the variables cannot be obtained. For this reason, the number of constraint equations corresponding to the number of variables is satisfied by using the constraint equation represented by the differential value of Equation 8.
- Equation 10 if 1 is included in the root of the denominator polynomial D (z), Equation 10 cannot be calculated. Therefore, if the root 1 of the multiplicity q is included in the root of the denominator polynomial D (z) according to the theorem of the capital, Formula 11 is used as a constraint formula instead of Formula 10.
- Formula 12 can be simplified and expressed as Formula 13.
- the matrix ⁇ and the matrix ⁇ are uniquely determined if the control target (control system) and the number of steps to reach the target value during control are determined. Therefore, it is important to design the matrix a. That is, as described above, the finite impulse response filter Nf (z) / Z n shown in Equation 3 determines the feedforward control law in the digital filter, but by determining the matrix a in Equation 13, Since the finite impulse response filter Nf (z) / Z n shown in Equation 3 is determined, it is necessary to determine the matrix a in determining the feedforward control law in the digital filter. Specifically, the matrix a is set as follows.
- an evaluation function J that suppresses the high-frequency component, specific frequency component, and frequency width of the control input U (z) is designed. Since the evaluation function J is expressed in the quadratic form of the matrix a, it is expressed as Equation 14. Q is a positive definite matrix for determining the evaluation function J.
- Equation 15 the positive definite matrix Q in Equation 14 is given as Equation 15.
- qj and qfk are weighting factors
- Qj is a weighting matrix considering high frequency component suppression of the control input U (z)
- Qfk is a weighting matrix considering specific frequency or frequency width suppression.
- Weighting matrix Qfk in the gain characteristics of the finite impulse response filter Nf (z) / Z n, is designed for the purpose of reducing the gain of a specific frequency or a specific frequency band.
- Equation 22 that is the square of the gain characteristic is given by Equation 22 as a quadratic form of the matrix a.
- Equation 23 Rfk ( ⁇ ) and Ifk ( ⁇ ) in Equation 22 are defined by Equation 23.
- Equation 22 when Equation 22 is integrated from ⁇ sk to ⁇ ek, Equation 24 is obtained.
- ⁇ sk and ⁇ ek in Expression 22 may be made to coincide.
- Equation 25 the parenthesis in the right side of Equation 24, that is, the equation between the transposed matrix a T and the matrix a is the weighting matrix Qfk. That is, the weight matrix Qfk is given by Equation 25.
- the weight matrix Qj is designed by Expression 20, and the weight matrix Qfk is designed by Expression 25.
- the matrix a that minimizes the evaluation function J of the mathematical formula 14 defined by the design of the mathematical formula 20 and the mathematical formula 25 is determined based on the constraint formula expressed as the mathematical formula 13, the control input U (z) It is possible to design a digital filter in the feedforward control of Formula 3 that suppresses the high-frequency component, specific frequency, and specific frequency band.
- a matrix a can be calculated by using Lagrange's undetermined coefficient method. Specifically, the matrix a can be defined as in Expression 26.
- the D / A converter 2, the power amplifier 3, the motor 4 and the load 5 are controlled objects, the load 5 is a moving object as a controlled object, and the control specifications are as follows:
- the target position is reached in 0 ms. If the matrix a is set so as to satisfy this, it means that it is set as requested.
- FIG. 6 is a diagram showing the result of the frequency response. As shown in this figure, it can be seen that the gain decreases in the set frequency band, that is, 1800 Hz to 2200 Hz, and these frequency components are suppressed. It can also be seen that high frequency components of 4000 Hz or higher have a reduced gain and are suppressed.
- the position command trajectory of the control position of the load 5 corresponding to the moving body is given by issuing the position command Rc (z)
- the high frequency component, the specific frequency or Gain is suppressed in a specific frequency range.
- resonance vibration can be suppressed, and after the position command Rc (z) reaches the target position, the position detection signal Y (z) can also reach the target position with the set number of steps. Therefore, it is possible to perform high-speed and high-accuracy positioning by suppressing the resonance mode of the mechanism having the moving body, and it is possible to execute feed-forward control that satisfies the target positioning time given to various operation patterns.
- FIG. 9 is a timing chart showing the relationship between the trajectory of the position command Rc (z) and the position detection signal Y (z) when the number of steps is nx until the position command Rc (z) reaches the target position. As shown in this figure, even when the number of steps nx until the position command Rc (z) reaches the target position is changed, after the position command Rc (z) reaches the target position, Furthermore, the number of steps until the position detection signal Y (z) reaches the target position can be set to n.
- FIG. 10 shows the position when the target position is changed when the position command Rc (z) is a step response or when the position command Rc (z) is a command to reach the target position with the number of steps nx.
- 6 is a timing chart showing the relationship between the trajectory of a command Rc (z) and the position detection signal Y (z).
- the position detection signal Y (z) reaches the target position after the number of steps n.
- the position detection signal Y (z) can reach the target position with the number of steps n.
- the resonance frequency that generates the resonance vibration of the control target (specifically, the D / A converter 2, the power amplifier 3, the motor 4, and the load 5) is within that frequency width.
- the frequency width at this time may be any width that includes the resonance frequency.
- such a frequency width may be obtained by determining the weighting matrix Qfk from ⁇ sk to ⁇ ek as a specific frequency band for which gain is to be suppressed.
- the weight matrix Qfk when suppressing the gain of a specific frequency, in the design of the weight matrix Qfk, the weight matrix Qfk that can suppress the gain of the specific frequency by matching ⁇ sk and ⁇ ek as the specific frequency for which the gain is to be suppressed is obtained. Can be sought.
- the specific frequency at this time is preferably coincident with the resonance frequency, but it is not always necessary to coincide completely. For example, it is sufficient if the specific frequency with the gain suppressed is within a range of ⁇ 10% with respect to the resonance frequency.
- the matrix a that minimizes the evaluation function J is determined.
- the minimum value of the evaluation function J is a local minimum value expressed in a quadratic form.
- the lower limit value of the originally defined evaluation function J is the minimum value.
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Abstract
Description
図1は、本実施形態にかかるフィードフォワード制御方法を実行する制御システムのブロック図である。この図に示されるように、本実施形態では、制御装置を構成するマイクロコンピュータ1からの指示電流をD/Aコンバータ2で変換したのち、電流制御を含むパワーアンプ3を介してモータ4に電流を流し、このモータ4を回転させることによって負荷5を駆動して、負荷5の位置決め動作、例えばモータ4の回転に伴う負荷5の角度の調整やモータ4の回転を軸方向の移動に変換したときの軸方向位置の調整などを行っている。すなわち、本実施形態では、負荷5を移動体として、この移動体の目標位置への位置決め制御を行っているが、この制御において、高速・高精度の位置決めが行えるように、移動体を有する機構の共振モードを抑制し、各種動作パターンに与えられる目標位置決め時間を満足するフィードフォワード制御を行う。
そして、このような制御システムにおいて、フィードフォワード制御補償を行うためのディジタルフィルタを設計し、位置指令軌道がディジタルフィルタのステップ数で目標位置に到達するようにする。
上記実施形態では、任意の位置指令Rc(z)をステップ指令とした場合について説明したが、位置指令Rc(z)をステップ数nxで目標位置に到達する指令とすれば、位置検出信号Y(z)は、位置指令Rc(z)が目標位置に到達するまでのステップ数nxに対してステップ数nを加算したステップ数(=nx+n)で目標位置に到達するような形態とすることができる。
Claims (5)
- 制御対象(2~5)における移動体(5)を目標位置に位置決めする位置決め制御に適用され、有限インパルス応答フィルタ(Nf(z)/Zn)にて構成されるデジタルフィルタに位置指令(Rc(z))を入力することで、前記移動体(5)へのフィードフォワード制御の制御入力(U(z))を算出するフィードフォワード制御方法において、
前記有限インパルス応答フィルタ(Nf(z)/Zn)の分子多項式(Nf(z))が前記制御対象(2~5)の離散時間系の伝達関数モデルの分母多項式(D(z))の根を含み、前記有限インパルス応答フィルタ(Nf(z)/Zn)の前記分子多項式(Nf(z))の係数(ak)を前記係数の2次形式である評価関数(J)を最小とすることで決定することにより、前記位置指令(Rc(z))が目標位置に到達後、前記前記移動体(5)を前記有限インパルス応答フィルタ(Nf(z)/Zn)の次数(n)のステップ数で前記目標位置に到達させることを特徴とする移動体のフィードフォワード制御方法。 - 前記有限インパルス応答ディジタルフィルタ(Nf(z)/Zn)の特定周波数のゲインを減少させ、前記特定周波数を前記制御対象(2~5)の共振振動を発生させる共振周波数に対して±10 %の範囲内とすることを特徴とする請求項1に記載の移動体のフィードフォワード制御方法。
- 前記有限インパルス応答ディジタルフィルタ(Nf(z)/Zn)のゲイン特性の二乗で表される関数に対して前記特定周波数を代入することで前記評価関数(J)の正定行列(Q)における特定周波数の抑制を行う重み行列(Qfk)を求めることを特徴とする請求項2に記載の移動体のフィードフォワード制御方法。
- 前記有限インパルス応答ディジタルフィルタ(Nf(z)/Zn)の特定周波数幅のゲインを減少し、前記特定周波数幅内に前記制御対象(2~5)の共振振動を発生させる共振周波数を含めることを特徴とする請求項1に記載の移動体のフィードフォワード制御方法。
- 前記有限インパルス応答ディジタルフィルタ(Nf(z)/Zn)のゲイン特性の二乗で表される関数を前記特定周波数帯において積分することで前記評価関数(J)の正定行列(Q)における特定周波数の抑制を行う重み行列(Qfk)を求めることを特徴とする請求項4に記載の移動体のフィードフォワード制御方法。
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US12/920,385 US8452424B2 (en) | 2008-03-05 | 2009-02-26 | Moving object feed-forward control method |
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JP2023031898A (ja) * | 2021-08-26 | 2023-03-09 | いすゞ自動車株式会社 | 情報処理装置 |
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US10295510B1 (en) * | 2014-08-20 | 2019-05-21 | Vibrant Corporation | Part evaluation based upon system natural frequency |
EP2996003B1 (en) * | 2014-09-11 | 2021-06-30 | Robert Bosch GmbH | Device and method for moving an object |
CN110347115B (zh) * | 2018-04-08 | 2021-04-30 | 华中科技大学 | 主轴共振转速在线检测和优化的方法及系统 |
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JP2007200463A (ja) * | 2006-01-27 | 2007-08-09 | Hitachi Global Storage Technologies Netherlands Bv | 磁気ディスク装置 |
JP2008310651A (ja) * | 2007-06-15 | 2008-12-25 | Yaskawa Electric Corp | 二自由度制御装置とその制御方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2023031900A (ja) * | 2021-08-26 | 2023-03-09 | いすゞ自動車株式会社 | 情報処理装置 |
JP2023031898A (ja) * | 2021-08-26 | 2023-03-09 | いすゞ自動車株式会社 | 情報処理装置 |
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US20110087340A1 (en) | 2011-04-14 |
JPWO2009110368A1 (ja) | 2011-07-14 |
JP5211306B2 (ja) | 2013-06-12 |
US8452424B2 (en) | 2013-05-28 |
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