JPH0328628B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hydraulic control valve with a display device for a hydraulic control system that displays various signals used to control the hydraulic control valve.

(Prior art) In recent years, in hydraulic control systems using hydraulic control valves, the PWM control method (pulse width control method) has been adopted for drive control of the hydraulic control valve, resulting in a significant reduction in the control circuit. Efforts have been made to reduce the size, and as a result,
Many types of valves in which the control circuit is integrated with the hydraulic pressure control valve are beginning to be adopted.

In the case of a hydraulic control system using a hydraulic pressure control valve with an integrated control circuit, for example, as shown in Fig. 3, one is equipped with a display unit that displays the feedback signal output from the detector. It is considered.

In FIG. 3, reference numeral 1 denotes a control circuit, to which a command signal A is input from the outside, and through arithmetic processing based on this command signal A, the control circuit 1 outputs a drive signal B to the hydraulic pressure control valve 2.

The hydraulic pressure control valve 2 controls the flow rate and pressure by operating an electromagnetic solenoid in response to a drive signal B from the control circuit 1, and supplies control hydraulic pressure to a drive load such as a hydraulic cylinder.

Furthermore, the control state of the hydraulic control valve 2 is detected by the detector 3, and is sent to the control circuit 1 as a feedback signal C.
will be returned to. The detector 3 detects the operating state of the hydraulic control valve 2 by detecting the displacement of the spool using a differential transformer, for example, if the opening is controlled, or by detecting the displacement amount of the spool by using a differential transformer, etc. if the operating state is controlled by a pressure transducer. Detects the control fluid pressure.

In order to monitor the control status of the control system, the feedback signal C of the detector 3 fed back to the control circuit 1 is sent to the A/D converter 5 of the display unit 4.
is input to convert it into digital data and display it on display 6.
The feedback signal C, ie, the control result of the hydraulic pressure control valve 2, is displayed.

Figure 4 shows the appearance of the hydraulic control valve with display device used in the control system of Figure 3. 2a is the valve body, 2b is the electromagnetic solenoid, and the control circuit 1 and display are on the electromagnetic solenoid 2b. It is equipped with a control unit 7 with a built-in display unit 4.

In such a conventional hydraulic pressure control valve with a display device, when the control system malfunctions, for example, when an abnormal rise or fall in the control pressure occurs in the pressure control valve, the output display on the display device 6 is checked. Only by checking whether the control output is being performed normally, it is not possible to investigate the cause of the failure.

(Problems to be Solved by the Invention) However, in such a conventional hydraulic pressure control valve with a display device, only the feedback signal C, which is the output of the control circuit 1, for example, is displayed on the display device 6. Therefore, when a hydraulic control valve malfunctions, it is not possible to check whether the control output is being performed correctly, and in the end, the problem is that it takes time to investigate the cause of the malfunction and find the abnormal location because it relies on empirical intuition. It was hot.

(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and even with a single display device, command signals and drive signals ( control output),
It is an object of the present invention to provide a hydraulic pressure control valve with a display device for a hydraulic pressure control system, which allows all types of information such as feedback signals to be monitored as necessary.

In order to achieve this objective, the present invention uses various control information such as command signals in the hydraulic control system, drive signals serving as control outputs, and feedback signals obtained by detecting the operating state of the valve with a detector. There is a switching circuit that inputs and outputs one of them, and a plurality of display selection switches with indicator lights that are turned on by switch operation for each type of control information input to the switching circuit. A display unit is provided integrally with the hydraulic control valve, and includes a switching command means for commanding the switching operation of the switching circuit in accordance with the operation output of the switch, and a display unit for displaying the switching output of the switching circuit. It is.

(Function) According to the configuration of the present invention, when the hydraulic pressure control valve malfunctions, one of the plurality of display selection switches with indicator lights provided corresponding to the control information to be displayed is selected. By operating the display selection switch corresponding to the information you want to display, you can display and monitor various control information such as command signals, drive signals, and feedback signals in hydraulic pressure control on the display, and detect malfunctions. It is possible to determine the cause of an abnormality from the abnormality of the monitor signal and take appropriate and prompt measures against the abnormality.

(Embodiment) FIG. 1 is an explanatory diagram showing an embodiment of a hydraulic pressure control valve with a display device of the present invention together with a control system.

First, to explain the configuration, 1 is a control circuit;
Command signal A, which is a control target, is input, and command signal A
A drive signal (current signal) B is supplied to the electromagnetic solenoid of the hydraulic control valve 2 through arithmetic processing based on the feedback signal C and the feedback signal C. The hydraulic pressure control valve 2 moves a spool by supplying a drive signal B to an electromagnetic solenoid or the like to control the flow rate or pressure.
Control hydraulic pressure is supplied to a control load such as a hydraulic cylinder (not shown). The operating state of the hydraulic control valve 2 is detected by the detector 3.
is detected and fed back to the control circuit 1 as a feedback signal C. The detector 3 detects the displacement of the spool using a differential transformer, etc. when the hydraulic pressure control valve 2 is controlling the opening, and detects the displacement of the spool using a pressure transducer, etc. if the hydraulic control valve 2 is controlling the opening. The pressure is detected and fed back to the control circuit 1 as a feedback signal C.

A display unit 10 is provided integrally with the hydraulic control valve 2 for a hydraulic control system consisting of the control circuit 1, the hydraulic control valve 2, and the detector 3.

The display unit 10 has a switching circuit 12, which in this embodiment receives each of the command signal A, drive signal B, and feedback signal C from the control circuit 1, and selects any one of the input signals A to C. Switch output. The output of the switching circuit 12 is converted into a digital signal by the A/D converter 14 and displayed on the display 16.
Displays numerically one of the input signals output.

On the other hand, 18a, 18b, 18c are display selection switches, and input signals A, 18c to the switching circuit 12,
In this embodiment, three display selection switches are provided corresponding to B and C. In addition, the display selection switches 18a to 18c have indicator lights built into the switch buttons that are transparent or colored in a predetermined manner, and when the switch buttons are turned on, the built-in indicator lights are turned on to indicate the switch operation status. That's what I do.

Each switch output of the display selection switches 18a to 18c is given to a switching command circuit 20, and the switching command circuit 20 is connected to the display selection switches 18a to 18c.
According to the switch output, a corresponding binary switching data code is output to the switching circuit 12, and one of the input signals A to C corresponding to the switching data code is switched and output. In addition, the switching command circuit 2
The binary switching data code from 0 is given to the indicator light control circuit 22, which decodes the switching data code from the switching command circuit 20 and selects one of the corresponding display selection switches 18a to 18c. The indicator light installed in the vehicle will now light up.

FIG. 2 is an explanatory diagram showing the display panel of the display unit 10 in the embodiment of FIG. Three display selection switches 18a to 18c are provided.

Here, the display selection switch 18a is activated by the command signal A.
Since it is provided in correspondence with the switch, it is marked "IN", and since the command signal A is a voltage signal, its unit "V" is drawn next to the switch. In addition, since the indicator light selection switch 18b is provided corresponding to the drive signal B, the switch is displayed as "OUT", and since the drive signal B is a current signal, the unit "A" is displayed next to it. I'm drawing. Furthermore, since the display selection switch 18c is provided corresponding to the feedback signal C, for example, if the control pressure of the hydraulic pressure control valve 2 is detected by the detector 3, the "P" switch is selected. A display is given, and the unit "Kgf/cm ² " is drawn next to it.

Next, the operation of the above embodiment will be explained.

First, in a hydraulic control system consisting of a control circuit 1, a hydraulic control valve 2, and a detector 3, the hydraulic control circuit 1 receives a command signal (voltage signal) A given as a control target value and a signal from the detector 3. Feedback signal C
A drive signal (current signal) B is output to the hydraulic pressure control valve 2 by performing calculations based on the above, and the drive signal B drives an electromagnetic solenoid, etc., so that the hydraulic pressure control valve 2 reaches the set pressure determined by the command signal A. This produces a hydraulic output for a control load such as a hydraulic cylinder.

On the other hand, each of the command signal A, drive signal B, and feedback signal C in the control circuit 1 is input to the switching circuit 12 of the display unit 10.
When none of the display selection switches 18a to 18c are operated, the output of the switching circuit 12 is cut off, but if, for example, the display selection switch 18b is operated to check the drive signal B of the control circuit 1, A switch signal from the display selection switch 18b is applied to a switching command circuit 20, which outputs a binary switching data code corresponding to the switch signal from the display selection switch 18b to the switching circuit 12. The switching circuit 12 that receives this binary switching data code switches and outputs the input signal B corresponding to the data code, which is converted into a digital signal by the A/D converter 14 and the current value of the drive signal B is displayed on the display 16. A numerical value is displayed.

At the same time, the binary switching data code from the switching command circuit 20 is given to the indicator light control circuit 22, and the indicator light control circuit 22 lights up the indicator light provided in the display selection switch 18b that has been operated.
By lighting this indicator light, the switch part of the display selection switch 18b is illuminated as shown in FIG.
It is immediately clear that the numerical value on the display 16 is the drive signal B.

Such switching and display of control information by operating the display selection switch can be performed in the same manner for other control signals, that is, the command signal A and the feedback signal C.

In the embodiment shown in FIG. 1, when any one of the display selection switches 18a to 18c is pressed, the corresponding binary switching data code is output from the switching command circuit 20, and this binary switching data code is output from the switching command circuit 20. The indicator light is turned on based on the confirmation process of lighting the indicator light provided in the display selection switch which is received by the display control circuit 22 and the switch operation is performed. The built-in indicator light may be turned on by mechanically closing the contacts by operating the display selection switch.

Further, in the embodiment shown in FIG. 1, the switch outputs from the display selection switches 18a to 18c are converted into binary data codes of the switching command circuit 20 to command the switching operation of the switching circuit 12. ,
Direct display selection switches 18a to 18a without conversion into binary data codes by the switching command circuit 20
The switch output of 18c may be applied to the switching circuit 12, and any one of a plurality of input signals may be switched and outputted by turning on an analog switch such as a FET.

Furthermore, although the embodiment of FIG. 1 takes as an example the switching display of three pieces of control information, the switching circuit 12
By increasing the capacity and display selection switch, an appropriate number of control information can be switched and displayed on the display 16 in the same way.

(Effects of the Invention) As described above, according to the present invention, a display selection switch with an indicator light corresponding to the number of control information to be displayed is provided, and the operation output of any one of the display selection switches is Based on this, the switching circuit that inputs the control information performs the switching operation, and the corresponding 1
The display selects and outputs two input signals to display numerical values on the display, so if a malfunction occurs in the hydraulic control system, the necessary information or all information can be switched and displayed by operating the display selection switch and the abnormality can be detected. You can check the information that is occurring, and when the control system malfunctions, you can appropriately and quickly investigate the cause of the failure and discover the location of the failure. In addition, quick repairs and adjustments can be made.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of the display panel surface of the display unit shown in FIG. 1, FIG. 3 is a block diagram showing a conventional example, and FIG. FIG. 2 is an explanatory diagram of the external appearance of a hydraulic control valve with an integrated display unit. 1: Control circuit, 2: Hydraulic pressure control valve, 3: Detector,
10: Display unit, 12: Switching circuit, 14:
A/D converter, 16: Display, 18a to 18c:
Display selection switch (with indicator light), 20: switching command circuit, 22: indicator light control circuit.

Claims (1)

[Scope of Claims] 1. A drive signal corresponding to a command signal for a control circuit is output to a hydraulic pressure control valve to drive it, and an operating state of the hydraulic pressure control valve is detected by a detector to be transmitted to the hydraulic pressure control circuit. In a hydraulic pressure control system that performs feedback, there is provided a switching circuit that inputs various control information such as a command signal, a drive signal, and a feedback signal in the control circuit and switches and outputs any one of them; a switching command means having a display selection switch with an indicator light that lights up when the switch is operated, and commanding the switching circuit to perform a switching operation based on the operation output of any one of the display selection switches; 1. A hydraulic control valve with a display device, characterized in that it is integrally equipped with a display unit having a display device for displaying a signal.