WO2020133879A1 - 一种单向泵双向泵混流定位的控制方法 - Google Patents

一种单向泵双向泵混流定位的控制方法 Download PDF

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WO2020133879A1
WO2020133879A1 PCT/CN2019/086708 CN2019086708W WO2020133879A1 WO 2020133879 A1 WO2020133879 A1 WO 2020133879A1 CN 2019086708 W CN2019086708 W CN 2019086708W WO 2020133879 A1 WO2020133879 A1 WO 2020133879A1
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dsvp
way pump
svp
pump
way
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PCT/CN2019/086708
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徐正华
杨晓文
张圣
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南京埃斯顿自动化股份有限公司
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors

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  • the invention relates to a control method of a two-way pump mixed flow positioning of a one-way pump.
  • the pump control form of the servo motor and bidirectional pump overcomes the one-way disadvantage of SVP and can achieve high efficiency .
  • Chinese patent CN108061029A named: Method and method for controlling multi-pump system CN206690607U, titled: Multi-pump confluence servo control system for hydraulic presses, which is mostly described in pressure and flow control methods; and the current popular multi-pump confluence research focuses on threshold optimization, and switches pumps through threshold conditions
  • the name is: injection pump multi-pump confluence control device and its control method, but this will inevitably introduce the problem of sudden flow change, which is difficult to achieve accurate positioning engineering.
  • the purpose of the present invention is to provide a control method for bidirectional pump mixed flow positioning of a one-way pump, which solves the technical problems of the existing traditional valve-controlled positioning scheme, such as large energy consumption, high noise, no controllable one-way pump control, and small flow rate of the two-way pump.
  • a control method for one-way pump and two-way pump mixed flow positioning includes the following steps:
  • the command speed CmdVel is used as the input of the one-way pump SVP control system, and the output CMDout(svp) of the one-way pump SVP control system is controlled by the adjustment of the open-loop gain Ksvp;
  • the command position CmdPos is used as the input of the bidirectional pump DSVP control system, and the real-time detection of the actuator position is used as feedback.
  • the gain Ksvp and flow distribution are adjusted through the SVP open loop
  • the gain parameter K(i) adjusts the output of each SVP, and all non-linear tracking deviations caused by SVP open-loop control are adjusted by DSVP feedback. It has the advantages of control decoupling and simple debugging, which can ultimately ensure that SVP and DSVP are driven together.
  • the actuator has good tracking and positioning performance.
  • the control method described in this application increases the flow through the mixed flow of the one-way pump SVP and the two-way pump DSVP, and is used for position control; the control method uses the one-way pump SVP open loop and the two-way pump DSVP closed loop control strategy to achieve Control decoupling, the one-way pump SVP open-loop control theory is a feedforward control.
  • the command output is used to adjust the control output. Not only can the SVP flow output be smooth and continuous, but also to a certain extent. Tracking performance, reducing the burden of DSVP tracking adjustment of the bidirectional pump; in the design of the DSVP closed-loop algorithm of the bidirectional pump, it is not limited to a fixed form.
  • the IP control used in the embodiment is an algorithm widely used in the industrial field at present, and can also be passed Advanced intelligent algorithms, such as fuzzy and adaptive, further improve the system robustness and tracking performance.
  • a combination of a one-way pump SVP and a two-way pump DSVP, or a combination of multiple one-way pumps SVP and a two-way pump DSVP is used.
  • the flow distribution gain parameter of the i-th one-way pump SVP is calculated according to the number of one-way pump SVP and the maximum displacement of each one-way pump
  • C(i) is the maximum displacement of the i-th group of one-way pumps SVP, and N is the total number of one-way pumps SVP;
  • step 1) the one-way pump SVP and the two-way pump DSVP use the same planning curve.
  • the DSVP closed-loop feedback algorithm of the two-way pump includes one of a PID algorithm, an allowed fuzzy or adaptive control method.
  • the control method of the two-way pump mixed flow positioning proposed by the present invention provides a new idea and solution for the hydraulic equipment of the forging industry in the occasion of large flow, high speed and high precision positioning, which can avoid the traditional valve control.
  • the problem of high energy consumption and high noise can also solve the shortcomings of one-way pump control that cannot be recalled, and low flow of two-way pumps.
  • the control algorithm uses SVP open-loop and DSVP closed-loop control strategies, and uses DSVP to allow positive and negative adjustment characteristics to design feedback control.
  • Algorithm to compensate for various disturbances, noise and nonlinear parts of the system, including the nonlinear part of the controlled object and the nonlinear part introduced by SVP open-loop control. It has control decoupling, simple debugging, high speed and low energy consumption
  • the high-precision realization of the positioning function of hydraulic equipment has obvious market application value.
  • Figure 1 is a control block diagram of single SVP and single DSVP mixed flow positioning control.
  • Figure 2 is a control block diagram of multi-SVP and single DSVP mixed flow positioning control.
  • Figure 3 is a control flow chart of SVP and DSVP mixed flow positioning control.
  • FIG. 4 is a control block diagram of an embodiment of SVP and DSVP mixed flow positioning control.
  • FIG. 5 is a schematic diagram of command positions in an embodiment of SVP and DSVP mixed flow positioning control.
  • FIG. 6 is a schematic diagram of command speed of an embodiment of SVP and DSVP mixed flow positioning control.
  • Figure 1 is a control block diagram of single SVP and single DSVP mixed flow positioning control, described in the continuous domain
  • CmdPos is the position command input
  • ActPos is the actuator position feedback
  • CmdVel is the command speed, which is obtained by CmdPos differential
  • Ksvp is the SVP open-loop adjustment Gain
  • CMDout(svp) is the output of SVP control system, used to drive SVP to move accordingly
  • Feedforward is DSVP feedforward control algorithm, which can include speed feedforward, acceleration feedforward, friction compensation, etc.
  • PID is the DSVP feedback control algorithm, which can include the traditional PID algorithm, and also allows advanced intelligent control methods such as fuzzy and adaptive.
  • CMDout (dsvp) is the output of the DSVP control system to drive the actuator to perform position tracking and positioning adjustment.
  • Figure 2 is a control block diagram of multi-SVP and single DSVP mixed flow positioning control, described in the continuous domain, where K(i) is the i-th SVP flow distribution gain parameter, which is the result of normalizing the maximum displacement of each pump. Therefore, the control output CMDout(svp)(i) of the i-th SVP can be obtained by multiplying the command speed CmdVel, open loop gain parameters Ksvp and K(i).
  • FIG. 3 is a flowchart of SVP and DSVP mixed flow positioning control. The specific implementation steps of the present invention can be described as follows:
  • the controlled object is a high-precision servo hydraulic press, which adopts a single SVP and single DSVP mixed flow positioning control strategy, in which the maximum displacement of SVP is 160cc and the maximum displacement of DSVP is 28cc.
  • CmdPos is a position command signal, using a 5th order position curve, a rise time of 5s, an amplitude of 1000cts
  • ActPos is a position feedback signal
  • position tracking error FolErr CmdPos -ActPos
  • DSVP adopts PI feedback, namely proportional integral control, proportional gain is Kp, integral gain is Ki
  • the feedforward uses speed and acceleration feedforward
  • Kvff is the speed feedforward gain
  • Kaff is the acceleration feedforward gain
  • SVP control total output CMDout(svp) CmdVel*Ksp*K(0), where, It can be seen that CMDout(svp) and CmdVel have a linear relationship. As can be seen from Figure 6, SVP can provide continuous smooth flow control without abrupt change. Finally, CMDout(svp) open-loop control SVP, CMDout(dsvp) closed-loop adjustment of DSVP, SVP and DSVP By jointly driving the hydraulic press, high-precision position tracking and positioning functions can be realized.
  • the control method of two-way pump mixed flow positioning proposed by the present invention realizes accurate positioning through the combination of SVP and DSVP, which can not only solve the shortcomings of traditional valve-controlled high energy consumption and high noise, but also make up for the failure of one-way pump Recall that the two-way pump has a small flow rate, adjust the output of each SVP through the SVP open-loop adjustment gain Ksvp and the flow distribution gain parameter K(i), and all the nonlinear tracking deviations caused by the SVP open-loop control will be adjusted by DSVP feedback.
  • the advantages of control decoupling and simple debugging can finally ensure the good tracking and positioning performance of the actuator driven jointly by SVP and DSVP.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

一种单向泵双向泵混流定位的控制方法，包括如下步骤：1)、按照工艺要求，对执行机构进行位置曲线规划，获取位置指令CmdPos及指令速度CmdVel；2)、指令速度CmdVel作为单向泵SVP控制系统的输入，通过开环增益Ksvp的调节控制单向泵SVP控制系统的输出CMDout(svp)；指令位置CmdPos作为双向泵DSVP控制系统的输入，以执行机构位置实时检测为反馈，计算反馈算法输出CMDoutFB(dsvp)和前馈算法输出CMDoutFF(dsvp)；计算双向泵DSVP控制总输出CMDout(dsvp)；3)、通过CMDout(svp)的开环控制单向泵SVP和CMDout(dsvp)闭环调节双向泵DSVP，单向泵SVP与双向泵DSVP共同驱动油压机，即实现高精度的位置跟踪及定位功能。通过SVP与DSVP组合的方式实现精确定位，不仅能够解决传统阀控高能耗高噪声的缺点，同时又能弥补单向泵无法回调双向泵流量小的不足。

Description

一种单向泵双向泵混流定位的控制方法 技术领域
本发明涉及一种单向泵双向泵混流定位的控制方法。
背景技术
锻压制造领域，高精度定位的需求在液压控制系统中逐年递增，相应的驱动设备及控制方法应运而生，其中，以比例阀或伺服阀为载体的阀控因其频响快的优点被广泛使用，但同时大量的能量浪费及额外的冷却设备也制约了其发展；伺服电机加单向泵(SVP)的泵控形式以其出色的节能降噪的优点逐步得到市场关注，但其单向特性，导致位置超调时需配合换向阀进行回调定位，定位时间长，调试难度较大；而伺服电机加双向泵(DSVP)的泵控形式，则克服了SVP单向缺点，可实现高效，低能耗，高精度的定位要求，是液压系统中高精度定位的一个新的发展方向。
然而目前市场上双向泵排量一般较低，多应用于低速低吨位的锻压设备中，通过DSVP实现高流量高吨位的应用成果相对较少；多泵合流的方式是一种解决方案，但注塑成型等行业中广泛使用的多泵合流的研究一般仅局限于单向泵，且多为压力控制，对位置精度的要求相对较低，如中国专利CN108061029A，名称为：控制多泵系统的方法和系统；CN206690607U，名称为：油压机用的多泵合流伺服控制系统，多描述于压力与流量的控制方法；且目前流行的多泵合流的研究多集中于阈值的优化，通过阈值条件来切换各泵以求达到分配最优，如中国专利CN10278534B，名称为：注塑机多泵合流控制装置及其控制方法，但这势必会引入流量突变的问题，用以实现精确定位工程难度大。
发明内容
本发明的目的在于提供一种单向泵双向泵混流定位的控制方法，解决现有传统阀控定位方案能耗大噪声高、单向泵控无法回调，双向泵流量小的技术问题。
为了实现上述目的，本发明专利技术方案如下：
一种单向泵双向泵混流定位的控制方法，包括如下步骤：
1)、按照工艺要求，对执行机构进行位置曲线规划，获取位置指令CmdPos及指令速度CmdVel；
2)、指令速度CmdVel作为单向泵SVP控制系统的输入，通过开环增益Ksvp的调节控制单向泵SVP控制系统的输出CMDout(svp)；
指令位置CmdPos作为双向泵DSVP控制系统的输入，以执行机构位置实时检测为反 馈，设计双向泵DSVP闭环反馈算法，计算反馈算法输出CMDoutFB(dsvp)；并设计双向泵DSVP前馈算法，计算前馈算法输出CMDoutFF(dsvp)；计算双向泵DSVP控制总输出CMDout(dsvp)＝CMDoutFB(dsvp)+CMDoutFF(dsvp)；
3)、通过CMDout(svp)的开环控制单向泵SVP和CMDout(dsvp)闭环调节双向泵DSVP，单向泵SVP与双向泵DSVP共同驱动油压机，即实现高精度的位置跟踪及定位功能。通过SVP与DSVP组合的方式实现精确定位，不仅能够解决传统阀控高能耗高噪声的缺点，同时又能弥补单向泵无法回调双向泵流量小的不足，通过SVP开环调节增益Ksvp及流量分配增益参数K(i)调节各SVP输出，将因SVP开环控制所导致非线性跟踪偏差全部归由DSVP反馈进行调节，具有控制解耦，调试简单的优点，可最终保证SVP与DSVP共同驱动的执行机构良好的跟踪及定位性能。
本申请中所述的控制方法，通过单向泵SVP与双向泵DSVP混流的方式增大流量，并用于位置控制；控制方法上采用单向泵SVP开环，双向泵DSVP闭环的控制策略，实现控制解耦，单向泵SVP开环控制理论是一种前馈控制，以指令速度为输入进行控制输出的调节，不仅能够使SVP流量输出平稳连续，同时也能够一定程度上的保证执行机构的跟踪性能,减轻双向泵DSVP跟踪调节的负担；在对双向泵DSVP闭环算法的设计中，不局限于某一固定形式，实施例中采用的IP控制为目前工业领域广泛应用的算法，也可通过先进智能算法，如模糊，自适应等进一步提高系统鲁棒性及跟踪性能。
进一步改进，采用一个单向泵SVP与一个双向泵DSVP组合的方式，或者多个单向泵SVP与一个双向泵DSVP的组合方式。
进一步改进，当采用多个单向泵SVP与一个双向泵DSVP的组合方式时，按单向泵SVP个数及各单向泵最大排量计算第i个单向泵SVP的流量分配增益参数
Figure PCTCN2019086708-appb-000001
其中C(i)为第i组单向泵SVP最大排量，N为单向泵SVP总数；
并分别计算各单向泵SVP控制输CMDout(svp)(i)＝CmdVel*Ksvp(i)*K(i)。
进一步改进，所述步骤1)中，单向泵SVP与双向泵DSVP采用同一规划曲线。
进一步改进，所述双向泵DSVP闭环反馈算法包括PID算法、允许模糊或自适应控制方法中的一种。
本发明采用上述技术方案具有如下明显的技术效果：
本发明所提出的单向泵双向泵混流定位的控制方法，为锻压行业液压设备在大流量高速高精度定位要求场合中提供了一种新的思路与方案，既能避免传统阀控带来的高能耗高噪声的问题，又能解决单向泵控无法回调，双向泵流量低的缺点，控制算法上采用SVP开环，DSVP闭环的控制策略，利用DSVP允许正反调节的特性，设计反馈控制算法，弥补系统存在各种扰动，噪声及非线性部分，即包括被控对象非线性部分也包括因SVP开环控制所引入的非线性部分，具有控制解耦，调试简单，可高速，低能耗，高精度的实现液压设备的定位功能，具有明显的市场应用价值。
附图说明
图1为单SVP与单DSVP混流定位控制的控制框图。
图2为多SVP与单DSVP混流定位控制的控制框图。
图3为SVP与DSVP混流定位控制的控制流程图。
图4为SVP与DSVP混流定位控制实施例的控制框图。
图5为SVP与DSVP混流定位控制实施例指令位置示意图。
图6为SVP与DSVP混流定位控制实施例的指令速度示意图。
具体实施方式
为使本发明的目的和技术方案更加清楚，下面将结合本发明实施例对本发明的技术方案进行清楚、完整地描述。
图1为单SVP与单DSVP混流定位控制的控制框图，在连续域内进行描述，CmdPos为位置指令输入，ActPos为执行机构位置反馈，CmdVel为指令速度，由CmdPos微分获得，Ksvp为SVP开环调节增益，与CmdVel获取CMDout(svp)，CMDout(svp)为SVP控制系统的输出，用以驱动SVP进行相应运动；Feedforward为DSVP前馈控制算法，可包括速度前馈、加速度前馈、摩擦补偿等，PID为DSVP反馈控制算法，可包括传统PID算法，也允许模糊，自适应等先进智能控制方法，CMDout(dsvp)为DSVP控制系统输出，用以驱动执行机构进行位置跟踪及定位的调节。
图2为多SVP与单DSVP混流定位控制的控制框图，在连续域内进行描述，其中
Figure PCTCN2019086708-appb-000002
K(i)为第i个SVP流量分配增益参数，是以各泵最大排量归一化处理的结果。因此，第i个SVP的控制输出CMDout(svp)(i)可由指令速度CmdVel，开环增益参数Ksvp及K(i)相乘获得。
图3为SVP与DSVP混流定位控制的流程图，本发明具体实施步骤可描述如下：
(a)按照工艺要求，对执行机构进行位置曲线规划，获取位置指令CmdPos及指令速度CmdVel；
(b)设计DSVP闭环反馈算法，计算反馈算法输出CMDoutFB(dsvp)；
(c)设计DSVP前馈算法，计算前馈算法输出CMDoutFF(dsvp)；
(d)计算DSVP控制总输出CMDout(dsvp)＝CMDoutFB(dsvp)+CMDoutFF(dsvp)；
(e)按SVP个数及各泵最大排量计算第i个SVP的流量分配增益参数
Figure PCTCN2019086708-appb-000003
其中C(i)为第i组SVP最大排量，N为SVP总数；
(f)分别计算各SVP控制输出CMDout(svp)(i)＝CmdVel*Ksvp(i)*K(i)。
结合实施例，并参照图4，图5，图6对本发明进行进一步描述。
实施例中被控对象为高精度伺服油压机，采用单SVP与单DSVP混流定位的控制策略，其中，SVP最大排量为160cc,DSVP最大排量为28cc。参照图4，图5，图6，在离散域内进行描述，CmdPos为位置指令信号，采用5阶位置曲线，上升时间为5s，幅值为1000cts，ActPos为位置反馈信号，位置跟踪误差FolErr＝CmdPos-ActPos，DSVP采用PI反馈，即比例积分控制，比例增益为Kp,积分增益为Ki，反馈控制输出则可表示为CMDoutFB(dsvp)＝FolErr*Kp+FolErrI*Ki，其中FolErrI为位置跟踪误差积分量，由如下公式获得FolErrI＝FolErrI+FolErr；前馈采用速度及加速度前馈，Kvff为速度前馈增益，Kaff为加速度前馈增益,前馈控制输出量则可表示为CMDoutFF(dsvp)＝CmdVel*Kvff+CmdAcc*Kaff，其中指令速度CmdVel＝CmdPos-prevCmdPos，prevCmdPos为上一扫描周期指令位置，指令加速度CmdAcc＝CmdVel-prevCmdVel，prevCmdVel为上一扫描周期指令速度；DSVP控制总输出CMDout(dsvp)＝CMDoutFB(dsvp)+CMDoutFF(dsvp)。SVP控制总输出CMDout(svp)＝CmdVel*Ksp*K(0),其中，
Figure PCTCN2019086708-appb-000004
可见CMDout(svp)与CmdVel成线性关系，由图6可知，SVP可以提供持续光滑无突变的流量控制，最终通过CMDout(svp)的开环控制SVP,CMDout(dsvp)闭环调节DSVP，SVP与DSVP共同驱动油压机即可实现高精度的位置跟踪及定位功能。
本发明所提出的一种单向泵双向泵混流定位的控制方法，通过SVP与DSVP组合的方式实现精确定位，不仅能够解决传统阀控高能耗高噪声的缺点，同时又能弥补单向泵无法回调 双向泵流量小的不足，通过SVP开环调节增益Ksvp及流量分配增益参数K(i)调节各SVP输出，将因SVP开环控制所导致非线性跟踪偏差全部归由DSVP反馈进行调节，具有控制解耦，调试简单的优点，可最终保证SVP与DSVP共同驱动的执行机构良好的跟踪及定位性能。
本发明中未做特别说明的均为现有技术或者通过现有技术即可实现，而且本发明中所述具体实施案例仅为本发明的较佳实施案例而已，并非用来限定本发明的实施范围。即凡依本发明申请专利范围的内容所作的等效变化与修饰，都应作为本发明的技术范畴。

Claims (5)

  1. 一种单向泵双向泵混流定位的控制方法，其特征在于，包括如下步骤：
    1)、按照工艺要求，对执行机构进行位置曲线规划，获取位置指令CmdPos及指令速度CmdVel；
    2)、指令速度CmdVel作为单向泵SVP控制系统的输入，通过开环增益Ksvp的调节控制单向泵SVP控制系统的输出CMDout(svp)；
    指令位置CmdPos作为双向泵DSVP控制系统的输入，以执行机构位置实时检测为反馈，设计双向泵DSVP闭环反馈算法，计算反馈算法输出CMDoutFB(dsvp)；并设计双向泵DSVP前馈算法，计算前馈算法输出CMDoutFF(dsvp)；计算双向泵DSVP控制总输出CMDout(dsvp)＝CMDoutFB(dsvp)+CMDoutFF(dsvp)；
    3)、通过CMDout(svp)的开环控制单向泵SVP和CMDout(dsvp)闭环调节双向泵DSVP，单向泵SVP与双向泵DSVP共同驱动油压机，即实现高精度的位置跟踪及定位功能。
  2. 根据权利要求1所述的单向泵双向泵混流定位的控制方法，其特征在于，采用一个单向泵SVP与一个双向泵DSVP组合的方式，或者多个单向泵SVP与一个双向泵DSVP的组合方式。
  3. 根据权利要求2所述的单向泵双向泵混流定位的控制方法，其特征在于，当采用多个单向泵SVP与一个双向泵DSVP的组合方式时，按单向泵SVP个数及各单向泵最大排量计算第i个单向泵SVP的流量分配增益参数
    Figure PCTCN2019086708-appb-100001
    其中C(i)为第i组单向泵SVP最大排量，N为单向泵SVP总数；
    并分别计算各单向泵SVP控制输CMDout(svp)(i)＝CmdVel*Ksvp(i)*K(i)。
  4. 根据权利要求1-3中任一项所述的单向泵双向泵混流定位的控制方法，其特征在于，所述步骤1)中，单向泵SVP与双向泵DSVP采用同一规划曲线。
  5. 根据权利要求4所述的单向泵双向泵混流定位的控制方法，其特征在于，所述双向泵DSVP闭环反馈算法包括PID算法、允许模糊或自适应控制方法中的一种。
PCT/CN2019/086708 2018-12-28 2019-05-13 一种单向泵双向泵混流定位的控制方法 WO2020133879A1 (zh)

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