JP4858333B2 - Interference information display method and display device - Google Patents

Description

The present invention relates to a method and a display device for displaying interference information indicating the degree of interference between channels in temperature control of a plurality of channels.

  Conventionally, as a temperature control method for reducing such interference between a plurality of channels, a plurality of detected temperatures corresponding to a plurality of control points, for example, an average temperature of a plurality of detected temperatures and a temperature difference based on a plurality of detected temperatures (inclination) There is a method (hereinafter also referred to as “gradient temperature control”) in which temperature control is performed using the average temperature and the gradient temperature as control amounts (see, for example, Patent Document 1).

  FIG. 10 is a configuration diagram when the gradient temperature control method is applied to temperature control of two channels.

  The detected temperatures at the two control points of the controlled object 30 are converted by the mode converter 31 into an average temperature that is an average value of both detected temperatures and a gradient temperature that is a temperature difference between the detected temperatures, and the average temperature and the target average temperature. Or a deviation between the gradient temperature and the target gradient temperature is input to each PID control unit 32.

  Each PID control unit 32 calculates and outputs an operation amount so as to eliminate an average temperature deviation or a gradient temperature deviation. In the precompensator 33, only the gradient temperature reacts to a change in the gradient temperature manipulated variable. The control output is distributed to control the output so that the response to the average temperature is small, and conversely, the response to the gradient temperature is small with respect to the change in the control amount of the average temperature. The temperature of the controlled object 30 is controlled.

  Conventionally, in order to control each of the two points to be controlled individually, the control of one point has an effect on the control of the other point, making it difficult to control with high accuracy. In the gradient temperature control, high-precision control is enabled by controlling the average temperature at two points and the gradient temperature, which is the temperature difference between the two points, as control amounts.

  In the predistorter 33 in this gradient temperature control method, the operation amount is distributed so that the change in the operation amount of one channel does not affect the control of the other channel. In order to determine the distribution ratio at 33, a parameter indicating the degree of interference between the channels is measured in advance by tuning, and the distribution ratio is determined based on the parameter indicating the degree of interference (for example, , See Patent Document 2).

This tuning is performed, for example, by giving stepwise operation amounts to the heaters of each channel and measuring the detected temperature from each temperature sensor. By this tuning, together with the parameter indicating the degree of interference, the temperature A PID parameter that is a control parameter can also be obtained.
Japanese Patent No. 3278807 JP 2001-265447 A (paragraph 0125, FIG. 19)

  After performing the above tuning, test control is performed to confirm whether the desired control performance, for example, whether or not a plurality of channels are controlled to a uniform temperature. If it is not obtained, trial control for confirmation is performed again by adjusting various parameters.

  Such trial control requires a long time to obtain the control result because it takes time to set the temperature depending on the control target.

  Therefore, when there is any abnormality, it is desirable to detect the abnormality in advance before performing a trial control that requires a long time.

  The present invention has been made in view of the above points, and is suitable for detecting an abnormality based on the degree of interference of each channel in the control of a plurality of channels. An object is to provide a temperature controller.

(1) In the interference information display method of the present invention, the temperature of the object to be controlled is detected at each of a plurality of detection points, converted into a gradient temperature and a representative representative temperature based on the plurality of detection temperatures, In temperature control of multiple channels that control the temperature using the representative temperature as a control amount , this is a method for displaying interference information indicating the degree of interference between channels, and for each channel, the influence of that channel and interference from other channels. Is displayed in a stacked graph .

  According to the interference information display method of the present invention, the influence of the channel and the degree of interference from other channels are graphically displayed for each channel, so that the interference state between the channels can be easily grasped visually. Thus, an abnormal interference state can be detected.

  The interference information is preferably a matrix indicating the degree of interference used for temperature control using the gradient temperature and the representative temperature as control amounts.

  According to this embodiment, the interference information used for the gradient temperature control that controls the temperature using the gradient temperature and the representative temperature as a control amount is displayed in a graphic form so that the degree of interference between the channels can be grasped. Various causes that can be detected and thus affect the interference state, such as incorrect wiring of temperature sensor or heater, poor contact of temperature sensor, heater failure, improper installation of temperature sensor, insufficient heater capacity Alternatively, it is possible to detect an abnormality due to excess or the like.

  As a result, it is possible to detect an abnormality and take countermeasures before tuning temperature parameters including interference information and performing trial control for later confirmation.

(2) In the embodiment of the above (1) , the gradient temperature is a temperature difference between a plurality of detected temperatures, and the representative temperature is an average temperature of the plurality of detected temperatures.

  According to this embodiment, it is suitable for controlling the controlled object to a uniform temperature.

( 3 ) In the embodiment of ( 1 ) or ( 2 ), the interference information is obtained from the plurality of detection points when the operation amount of each channel corresponding to each of the plurality of detection points is sequentially changed. This is obtained by measuring the change in the detected temperature.

  According to this embodiment, it is possible to obtain the interference information indicating the degree of interference between the channels by measuring the change in the detection temperature of the plurality of detection points when the operation amount of each channel is changed in order, In addition, temperature control parameters such as PID parameters can be obtained.

( 4 ) The interference information display device of the present invention detects the temperature of the controlled object at each of a plurality of detection points, converts the detected temperature into a gradient temperature based on the plurality of detection temperatures and an average temperature of the plurality of detection temperatures, and the gradient temperature. And a device for displaying interference information indicating the degree of interference between the channels in the temperature control of a plurality of channels for controlling the temperature using the average temperature as a control amount, for each channel, from the influence of the channel and other channels. Display means for displaying the degree of interference in a stacked graph .

  According to the interference information display device of the present invention, the interference information used for the gradient temperature control for controlling the temperature using the gradient temperature and the representative temperature as control amounts is obtained for each channel, with respect to the influence of the channel and the interference from other channels. Since the degree is graphically displayed, it is possible to detect an abnormality in the interference state. As a result, it is possible to detect an abnormality and take countermeasures before performing a trial control that requires a relatively long time.

( 5 ) In one embodiment of the interference information display device of the present invention, the interference information is detected when the operation amount of each channel corresponding to each of the plurality of detection points is sequentially changed. This is obtained by measuring a change in the detected temperature of the point.

  According to this embodiment, it is possible to obtain the interference information indicating the degree of interference between the channels by measuring the change in the detection temperature of the plurality of detection points when the operation amount of each channel is changed in order, In addition, temperature control parameters such as PID parameters can be obtained.

  According to the present invention, the influence of the channel and the degree of interference from other channels are displayed graphically for each channel, so that the interference state between the channels can be easily grasped visually, and abnormal interference is detected. It is possible to detect abnormalities caused by various causes that affect the state and therefore the interference state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a temperature control system that implements a display method according to an embodiment of the present invention.

  The temperature control system includes a mold 1 as a control target, a temperature controller 2 that controls the temperature of the mold 1, and a personal computer 3 as a display device that displays interference information according to the present invention. ing.

The mold 1 of this embodiment is, for example, a mold on the fixed side or movable side of an injection molding machine.
FIG. 2 is a front view showing the arrangement of the mold 1 and the heaters 4 to 11 in FIG. A concave portion (not shown) for forming a cavity is formed on the surface of the mold 1, but is omitted in FIG. 2.

  In the vicinity of the surface of the mold 1, eight temperature sensors 12 a to 12 h that respectively detect the temperatures of the eight control points A to H are arranged along the same circumference from the center of the mold 1. ing.

  A total of nine plate heaters 4, 5 a, 5 b, 6, 7 a, 7 b, 8, 9 a, 9 b, 10, 11 a, 11 b are attached to each side of the mold 1.

  Of the nine heaters 4, 5 a, 5 b, 6, 7 a, 7 b, 8, 9 a, 9 b, 10, 11 a, 11 b attached to each side of the square mold 1, the heaters at the four corners of the square 5a, 5b, 7a, 7b, 9a, 9b, 11a, and 11b are two heaters 5a, 5b; 7a, 7b; 9a, 9b; 11a, 11b, respectively. Five, six, seven, eight, nine, ten, and eleven are the same number as the temperature sensors 12a to 12h. In this embodiment, eight channels of temperature control are performed.

The temperature controller 2 in FIG. 1 controls energization of the eight heaters 4 to 11 through an SSR (not shown) based on the detected temperatures of the temperature sensors 12a to 12h at the control points A to H. .
The temperature controller 2 of this embodiment does not individually control the temperature for each channel, but uses the temperature control method disclosed in the above-mentioned Patent Documents 1 and 2, etc.

  As described above, this temperature control method converts a plurality of detected temperatures corresponding to a plurality of control points into, for example, an average temperature of a plurality of detected temperatures and a temperature difference (gradient temperature) based on the plurality of detected temperatures. The temperature is controlled using the average temperature and the gradient temperature as control amounts.

  FIG. 3 is a block diagram showing the configuration of the gradient temperature control in the temperature controller 2 of this embodiment.

  The temperature controller 2 of this embodiment converts the input temperatures PV1 to PV8 from the eight temperature sensors 12a to 12h into one average temperature (average PV) and seven gradient temperatures (gradient PV1 to gradient PV7). The operation amount is calculated based on the mode converter 14 and the deviation between each temperature (average PV, slope PV1 to slope PV7) from the mode converter 14 and the target temperature (average SP, slope SP1 to slope SP7). The eight PID control units 15 and the operation amount from each PID control unit 15 are distributed so that the influence of the control by each PID control unit 15 on the control by the other PID control unit 15 is eliminated or reduced. And a pre-compensation unit 16 that provides control outputs MV1 to MV8 to the heaters 4 to 11, respectively.

  The mode conversion unit 14 converts the eight input temperatures PV1 to PV8 into an average temperature (average PV) that is an average value thereof and, for example, a temperature difference (PV1-PV2, PV2-PV3, PV3-PV4) between adjacent input temperatures. ,..., PV7-PV8) are converted into seven gradient temperatures (gradient PV1 to gradient PV7).

  Note that the gradient temperature is not limited to the temperature difference with the adjacent input temperature. For example, the temperature difference between the average temperature (average PV) and each input temperature (PV1-average PV, PV2-average PV, PV3-average). PV, ... PV7-average PV). Thus, by using the temperature difference between each input temperature and the average temperature as the gradient temperature, it becomes possible to control the temperature of the symmetrical mold more evenly.

  For the target temperature SP, the difference between the target average temperature (average SP), which is the average value of the set temperatures (target temperatures) SP1 to SP8 of the eight control points A to H, for example, the adjacent set temperature (SP1- SP2, SP2-SP3, SP3-SP4,... SP7-SP8) are set as seven target gradient temperatures (gradient SP1 to gradient SP7).

  Each PID control unit 15 performs a PID calculation so as to eliminate a deviation between the input temperature PV and the target temperature SP, and outputs an operation amount.

  The pre-compensation unit 16 decomposes the operation amount from the PID control unit 15 and has the same configuration as that disclosed in Patent Documents 1 and 2, etc., and the distribution ratio of the pre-compensation unit 16 Gc is a pre-compensation matrix that is a matrix of the above, and mode conversion is performed on a matrix that converts the detected temperatures (PV1 to PV8) by the above-described mode converter 14 into gradient temperatures (gradients PV1 to PV7) and average temperatures (average PV). If the matrix Gm and the interference matrix that is information indicating the degree of interference are Gp, the pre-compensation matrix Gc can also be obtained as an inverse matrix as follows.

Gc = (Gm · Gp) ⁻¹
When each of the eight control points A to H is individually controlled, a certain control point influences another control point, that is, it is difficult to perform high-precision temperature control due to interference. In the temperature control, the average temperature and the gradient temperature based on the detected temperatures at the eight control points A to H are controlled as control amounts, so that highly accurate temperature control with reduced influence of interference becomes possible.

  The interference matrix indicating the degree of interference is measured by tuning. For example, stepwise operation amounts are given to the heaters 4 to 11 of each channel in order, and changes in detected temperatures from the temperature sensors 12a to 12h. It is based on.

  This tuning is executed by a user setting operation, and at the time of this tuning, a PID parameter is also obtained.

  FIG. 4 is a diagram showing an example of changes in the detected temperature of each channel in this tuning, in which the horizontal axis indicates time and the vertical axis indicates the detected temperature, and the control points A to H in FIG. The correspondence of is also shown.

  As described above, stepwise operation amounts are sequentially given to the heaters 4 to 11 of the respective channels corresponding to the respective control points A to H, and changes in the detected temperatures from the respective temperature sensors 12a to 12h are measured. In FIG. 4, a rectangular area surrounded by a broken line representatively shows the measurement period of each channel.

  Table 1 shows an interference matrix indicating the degree of interference obtained by this tuning.

この干渉行列は、規格化された値で単位はなく、各制御点Ａ〜Ｈに対応する各チャンネルの干渉の度合いを示している。

This interference matrix is a standardized value and has no unit, and indicates the degree of interference of each channel corresponding to each control point A to H.

  In Table 1, the vertical column indicates the degree of interference in each of the channels A to H. For example, when viewing the row of channel A, the influence of channel A itself is “10656”, the degree of interference from channel B is “2934”, there is no interference from channels C and D, and “0”. The degree of interference from channel E is “97”, the degree of interference from channel F is “73”, the degree of interference from channel G is “311”, and the interference from channel H is Is “2856”.

  From the arrangement of the heaters 4 to 11 and the temperature sensors 12a to 12h in FIG. 2 described above, the channel A corresponding to the control point A is affected by interference from the channels B and H corresponding to the control points B and H on both sides thereof. As described above, in the channel A in Table 1, the degree of interference from the channel B is “2934” and the degree of interference from the channel H is “2856”. ing.

  In this embodiment, an abnormality is detected using an interference matrix indicating the degree of interference, but the abnormality is detected from the waveform of the temperature change during the tuning in FIG. 4 and the numerical values in Table 1. It is difficult.

  For this reason, in this embodiment, the matrix indicating the degree of interference is displayed in a graph so that the degree of interference between the channels can be easily recognized visually.

  FIG. 5 shows an example of this graph display. In this graph display, the horizontal axis is the channels A to H, the vertical axis is the area graph display stacked as the matrix values in Table 1, and each channel is displayed in a different color. In FIG. 5, different colors are indicated by different oblique lines.

  In this area graph, the degree of interference of each channel is displayed in a stacked manner. For example, in channel E, the height h1 indicates the degree of interference from the adjacent channel F, and the height h2 indicates the channel E. The influence of itself is shown, and the height h3 indicates the degree of interference from the adjacent channel D.

  With this graph, for each channel, the degree of interference from the channel and other channels can be grasped at a glance, and an abnormal interference state can be detected.

  FIG. 6 shows a display example of the interference matrix in the case of abnormality, Table 2 shows the value of the interference matrix, and FIG. 7 shows the waveform at the time of tuning.

図６のグラフ表示を見ると、チャンネルＡからの干渉が全てのチャンネルＢ〜Ｈに及んでおり、その度合いも大きく、異常であることを示している。

When the graph display of FIG. 6 is seen, the interference from the channel A reaches all the channels B to H, and the degree thereof is large, indicating that it is abnormal.

  Although it is difficult to detect an abnormality from the tuning waveform in FIG. 7 and the numerical value of the interference matrix in Table 2, as shown in FIG. 6, the abnormality in the interference state is easily detected by displaying the degree of interference in a stacked manner. be able to.

  The abnormality in FIG. 6 is caused by the influence of the previous channel appearing in the subsequent channel because the interval of application of the operation amount of each channel during the tuning shown in FIG. 7 is narrow.

  FIG. 8 and FIG. 9 show the control waveforms of each channel when the interference matrix of FIG. 5 and FIG. 6 is obtained.

  In FIG. 8, the temperature variation width between the channels is narrower than that in FIG. 9 and is controlled to a uniform temperature, whereas in FIG. 9, the temperature variation width between the channels is large and desired. It can be seen that this is an abnormal state in which uniform temperature control is not possible.

  In this way, abnormalities can be detected from the graph display of the interference matrix, so it is possible to take measures before trial control after tuning. Thus, it is not necessary to detect an abnormality from the control result, and the number of trial controls can be reduced.

  Abnormalities that can be detected by displaying the interference matrix include various causes that affect the interference state, such as incorrect wiring of the temperature sensor or heater, poor contact of the temperature sensor, defective heater, and the location of the temperature sensor. Inappropriate, insufficient or excessive heater capacity is assumed.

  Therefore, when there is such an abnormality, it is possible to detect the abnormality of the interference state by displaying the interference matrix in a graph.

  In the above-described embodiment, the graphic display is performed on the personal computer 3, but it may be displayed on the liquid crystal display unit 20 of the temperature controller 2-1, as shown in FIG.

  The present invention is useful for temperature control of a plurality of channels.

1 is a schematic configuration diagram of a system including a display device according to an embodiment of the present invention. It is a front view which shows the metal mold | die and heater of FIG. It is a block diagram of the principal part of the temperature controller of FIG. It is a figure which shows a tuning waveform. It is the figure which displayed the graph of an example of the interference degree of each channel. It is the figure which displayed the graph of other examples of the interference degree of each channel. It is a figure which shows the tuning waveform corresponding to FIG. It is a figure which shows the control waveform corresponding to FIG. It is a figure which shows the control waveform corresponding to FIG. It is a block diagram of temperature control which makes a controlled variable the temperature difference and average temperature. It is a figure which shows the example of a display in a temperature regulator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 2 Temperature controller 3 Personal computer 12a-12h Temperature sensor 14 Mode conversion part 15 PID control part 16 Precompensation part

Claims (5)

Temperatures of multiple channels that detect the temperature to be controlled at a plurality of detection points, convert them to ramp temperatures and representative representative temperatures based on the multiple detected temperatures, and control the temperature using the ramp temperature and the representative temperature as control amounts In the control, a method for displaying interference information indicating a degree of interference between the channels,
A method of displaying interference information, characterized in that, for each channel, the influence of the channel and the degree of interference from other channels are displayed in a stacked graph . The interference information display method according to claim 1 , wherein the gradient temperature is a temperature difference between a plurality of detected temperatures, and the representative temperature is an average temperature of the plurality of detected temperatures. Wherein the interference information, to claim 1 or 2, obtaining the plurality of measuring the change in the detected temperature of the detection point when the plurality of the operation amount of each channel corresponding to each detection point is changed in sequence To display interference information. Multiple channels that detect the temperature of the object to be controlled at a plurality of detection points, convert it to a gradient temperature based on a plurality of detection temperatures and an average temperature of the plurality of detection temperatures, and control the temperature using the gradient temperature and the average temperature as control amounts In the temperature control, a device for displaying interference information indicating the degree of interference between the channels,
An interference information display apparatus comprising: a display unit that displays, for each channel, the influence of the channel and the degree of interference from other channels in a stacked graph . Interference according to the interference information, to claim 4 obtained by measuring a change in the plurality of detected temperatures of said plurality of detection points when respectively the amount of operation of each corresponding channel is changed sequentially to each detection point Information display device.

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