JP2017190858A - Calibration device and method of electronic control type control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calibration device and method of an electronic control type control valve enabling calibration easily in a short time.SOLUTION: A calibration device is configured to input a predetermined electric signal to paired electromagnetic proportional decompression valves, which are configured to input pilot pressure to pilot chambers at both ends of one spool. The calibration device is configured to measure, with a pressure sensor 33, pilot pressure input to each pilot chamber to input it to an external controller 32. Based on a comparison result between target pilot pressure assumed to be input from the electromagnetic proportional decompression valve to the pilot chamber of the spool with the predetermined electric signal and the actual measurement pilot pressure, the calibration device is configured to calculate a calibration amount of the actual measurement pilot pressure to the target pilot pressure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electronically controlled control valve calibration apparatus and method therefor which includes an electromagnetic valve that moves a spool by inputting pilot pressure into pilot chambers provided at both ends of the spool.

  In general, for example, a hydraulic working machine such as a hydraulic excavator controls the flow rate and direction of hydraulic oil supplied to and discharged from an actuator such as a hydraulic cylinder and a hydraulic motor by a control valve. Such a control valve includes a spool and a remote control valve for piloting the spool for each actuator. The remote control valve operated according to the manual operation of the lever or pedal by the operator supplies the pilot pressure to the pilot chambers at both ends of the spool according to the operation amount, so that the spool is moved and the hydraulic oil is The flow path is opened and closed.

  In recent years, the remote control valve is an electromagnetic valve (electromagnetic solenoid valve) such as an electromagnetic proportional pressure reducing valve that is operated by an electric signal output from an in-vehicle controller in accordance with an operation amount of lever operation and outputs a pilot secondary pressure. An oil conversion valve may be used.

  However, since such an electro-oil conversion valve has variations due to manufacturing tolerances, hysteresis characteristics, etc., in the input / output characteristics of the pilot secondary pressure signal with respect to the input electric signal, the control valve for the input electric signal of the electro-oil conversion valve The spool displacement also varies.

  For this reason, it is necessary to measure the spool stroke with respect to the command current value, and to store it in the controller as a calibration value if it is out of tolerance. Then, the technique which measures the output pilot pressure signal with respect to the input electric signal to an electro-oil conversion valve with a gauge port, and calibrates the input-output characteristic of an electro-oil conversion valve is known (for example, refer to patent documents 1). .

JP 2001-289202 A

  However, in the case of the above-described configuration, it is necessary to measure the pressure by attaching a pressure detector such as a Bourdon tube to each gauge port of the electro-oil conversion valve. Since a pair of electro-oil conversion valves is provided for each spool, the number of control valves as a whole is large, and it takes time to perform calibration manually one by one, and the burden on the operator is large.

  The present invention has been made in view of these points, and an object of the present invention is to provide an electronic control type control valve calibration apparatus and method that can be easily calibrated in a short time.

  According to the first aspect of the present invention, there is provided an electronic device comprising an electromagnetic valve that moves an spool by converting an electric signal corresponding to an input operation into a pilot pressure and inputting the pilot pressure into pilot chambers provided at both ends of the spool. A control device for calibrating a control type control valve, each of which detects a pilot pressure inputted to a pilot chamber of a spool, a controller electrically connected to these pressure sensors, and a solenoid signal by a predetermined electric signal The target pilot pressure that is assumed to be input to the pilot chamber of the spool and this electric signal are input to the respective solenoid valves that form a pair for inputting the pilot pressure to the pilot chamber at both ends of the spool, thereby corresponding to each pilot chamber. Based on the result of comparison with the actual pilot pressure detected by the paired pressure sensor and input to the controller Te is obtained; and a calculation unit for calculating a calibration amount of actual pilot pressure to the target pilot pressure.

  According to a second aspect of the present invention, there is provided an electronic device comprising an electromagnetic valve that moves an spool by converting an electric signal corresponding to an input operation into a pilot pressure and inputting the pilot pressure into pilot chambers provided at both ends of the spool. A method for calibrating a control type control valve, wherein a predetermined electric signal is input to a pair of solenoid valves for inputting pilot pressure to pilot chambers at both ends of one spool, and the pilot is input to each pilot chamber. Measure the pressure, and calculate the calibration amount of the measured pilot pressure with respect to the target pilot pressure based on the comparison result between the target pilot pressure that is expected to be input from the solenoid valve to the pilot chamber of the spool and the measured pilot pressure by a predetermined electrical signal Is.

  According to the first aspect of the present invention, predetermined electric signals are respectively input to the pair of solenoid valves for inputting pilot pressure to the pilot chambers at both ends of one spool, and input to each pilot chamber by the pressure sensor. The pilot section is measured and input to the controller, and the calculator calculates the target pilot pressure based on the comparison result between the target pilot pressure expected to be input from the solenoid valve to the pilot chamber of the spool by a predetermined electrical signal and the measured pilot pressure. Since the calibration amount of the measured pilot pressure with respect to is calculated, all the spools can be automatically calibrated and can be easily calibrated in a short time. Further, since the same pressure is input to the spool by the solenoid valves at both ends, the spool can be calibrated in a state where the spool does not substantially move and the fluid pressure actuator operated by the movement of the spool does not substantially operate. The electromagnetic valves that make a pair can be calibrated at the same time, and calibration can be performed in a short time.

  According to the second aspect of the present invention, a predetermined electric signal is input to each of the solenoid valves forming a pair for inputting the pilot pressure to the pilot chambers at both ends of one spool, and the pilot pressure input to each pilot chamber is input. And the calibration amount of the measured pilot pressure with respect to the target pilot pressure is calculated based on the comparison result between the target pilot pressure and the measured pilot pressure that are assumed to be input from the solenoid valve to the pilot chamber of the spool by a predetermined electrical signal. Since all the spools can be automatically calibrated by using the pressure sensor for detecting the pilot pressure and the controller for inputting the detection result of the pressure sensor, the calibration can be easily performed in a short time. Further, since the same pressure is input to the spool by the solenoid valves at both ends, the spool can be calibrated in a state where the spool does not substantially move and the fluid pressure actuator operated by the movement of the spool does not substantially operate. The electromagnetic valves that make a pair can be calibrated at the same time, and calibration can be performed in a short time.

It is explanatory drawing which shows one Embodiment of the calibration apparatus of the electronically controlled control valve which concerns on this invention. It is a circuit diagram of a working machine provided with the electronic control type control valve calibrated with a calibration apparatus same as the above. It is a side view which shows a working machine provided with an electronic control type control valve same as the above. It is a flowchart which shows the outline of the calibration method using a calibration apparatus same as the above. It is a flowchart which shows the identification process of a calibration method same as the above. It is a flowchart which shows the calibration process of a calibration method same as the above.

  Hereinafter, the present invention will be described in detail based on one embodiment shown in FIGS.

  As shown in FIG. 3, a hydraulic excavator 1 as a work machine is provided with a lower traveling body 2 so that an upper swing body 3 can swing, and the upper swing body 3 includes a power unit 4, a cab 5, and a work device 6. Etc. are installed. The working device 6 includes, for example, a boom 7 that is pivotally supported by the upper swing body 3 so as to be movable up and down, a stick (arm) 8 that is pivotally supported at the tip of the boom 7, and a tip of the stick 8. A bucket 9 that is pivotally supported is provided.

  On the upper swing body 3, as shown in FIG. 2, an electronically controlled control valve 11 (hereinafter simply referred to as a control valve 11) that performs a stroke operation in accordance with an electric signal is mounted. The control valve 11 includes an electromagnetic proportional pressure reducing valve 12a, 12b that is a solenoid valve that outputs a pilot pressure corresponding to an electric signal such as an input current value, and the displacement direction and the pilot pressure from the electromagnetic proportional pressure reducing valves 12a, 12b. A plurality of sets of pilot-operated spools 13 whose displacement amounts are controlled are provided.

  The electromagnetic proportional pressure reducing valves 12a and 12b are an in-vehicle controller (MECM) 15 as a first controller (main controller) to which an operating device 14 such as an electric joystick provided in the cab 5 (FIG. 3) is connected on the input side. It is connected to the output side. These electromagnetic proportional pressure reducing valves 12a and 12b are arranged at both ends of each spool 13, respectively. The electromagnetic proportional pressure reducing valves 12a and 12b output a pilot pressure corresponding to the input electric signal from the in-vehicle controller 15 to the spool 13. A monitor (not shown) is connected to the in-vehicle controller 15, and this monitor visually displays various types of information output from the in-vehicle controller 15, and allows the operator to manually input various setting operations. ing. The in-vehicle controller 15 is set with an external calibration (external calibration) mode to be described later.

  Each of the plurality of spools 13 includes, from a main pump (not shown), a fluid pressure actuator (travel motor) of the lower traveling body 2 (FIG. 3), and a fluid pressure actuator (swivel motor) of the upper swing body 3 (FIG. 3). The working fluid such as hydraulic fluid supplied to a fluid pressure actuator (hydraulic cylinder) for operating the boom 7, the stick 8 and the bucket 9 (FIG. 3) of the working device 6 is subjected to direction control and flow rate control. In the figure, only three spools 13 are shown for clarity of explanation.

  Pilot chambers 13a and 13b are provided at both ends of each spool 13 of the control valve 11 (one end side and the other end side). Each spool 13 is displaced by controlling the pilot pressure acting on the pilot chambers 13a, 13b at both ends by the electromagnetic proportional pressure reducing valves 12a, 12b disposed at both ends.

  Further, a passage 25 to a pilot primary pressure circuit for supplying a pilot primary pressure to the electromagnetic proportional pressure reducing valves 12a and 12b is provided from a pilot pump 21 serving as a pump to a tank 22. The passage 25 is branched to a pilot primary pressure passage 25a that supplies pilot primary pressure to the electromagnetic proportional pressure reducing valves 12a and 12b.

  The control valve 11 can calibrate the input / output of the pilot secondary pressure supplied to the pilot chambers 13a and 13b of the spool 13 via the electromagnetic proportional pressure reducing valves 12a and 12b by the calibration device 31 shown in FIG. It has become. The calibration device 31 includes an external controller (Ext-ECM) 32 as a second controller (auxiliary controller) that is a controller different from the in-vehicle controller 15, and a plurality of pressure sensors 33.

  The external controller 32 is detachably connected to the in-vehicle controller 15 and a battery (not shown) of the power unit 4 (FIG. 3) via the connector 35. The connector 35 is a service connector provided in advance in the hydraulic excavator 1 (FIG. 3) to which the vehicle-mounted controller 15 on the hydraulic excavator 1 (FIG. 3) side, a battery, and a ground are connected, and the external controller 32 includes a connector. In addition to the terminals 32a, 32b, and 32c that are electrically connected to the vehicle-mounted controller 15, the battery, and the ground on the hydraulic excavator 1 (FIG. 3) side, the battery is connected to the battery terminal 32b. Terminal 32d is provided. The terminal 32d is a key position terminal of the external controller 32, for example, for switching on / off of power supply from the battery to the external controller 32, the pressure sensor 33, and the like by a key operation. Then, the external controller 32 communicates with the in-vehicle controller 15 using a predetermined communication protocol, and controls the operation of the in-vehicle controller 15 so that an electric signal is sent from the in-vehicle controller 15 to the electromagnetic proportional decompression at both ends of the control valve 11. A comparison result (difference) between the target pilot pressure that is input to the solenoids of the valves 12a and 12b and that is expected to be input to the pilot chambers 13a and 13b by the input electric signal, and the actual pilot pressure in the pilot chambers 13a and 13b. ), The function of a calculation unit that calculates the input / output calibration amounts of the electromagnetic proportional pressure reducing valves 12a and 12b of the control valve 11 is provided.

  The pressure sensor 33 is connected to each connection tap TP of the control valve 11 and electrically connected to the external controller 32, and inputs the measured pressure to the external controller 32. The connection tap TP is connected to either one of the pilot chambers 13a and 13b of each spool 13, and the pilot secondary pressure supplied from the electromagnetic proportional pressure reducing valves 12a and 12b to the pilot chambers 13a and 13b, that is, the electromagnetic proportional pressure reducing valve. The output pressures 12a and 12b can be taken out and output to the pressure sensor 33 connected to the connection tap TP. Note that the number of pressure sensors 33 may be the same as the number of connection taps TP, or more than the number of connection taps TP in order to correspond to the connection taps TP for the spool 13 corresponding to a spare fluid pressure actuator or the like.

  Next, a calibration method using the calibration device 31 of the illustrated embodiment will be described.

First, an outline of this calibration method will be described with reference to the flowchart shown in FIG.
(Step S1)
The operator manually connects the external controller 32 to the in-vehicle controller 15, the battery, and the ground via the connector 35 and manually connects each pressure sensor 33 to each connection tap TP using the calibration device 31.
(Step S2)
The operator starts the external calibration mode mounted on the in-vehicle controller 15 by manual operation. This external calibration mode can be selected, for example, in a service menu called from the monitor.
(Step S3)
The external controller 32 activated by the supply of power from the battery communicates with the in-vehicle controller 15 and inputs an electric signal for the external calibration mode to the in-vehicle controller 15, thereby corresponding to each spool 13 and the spool 13. Predetermined identification processing is performed to identify the corresponding relationship with each pressure sensor 33 connected to each connection tap TP of the electromagnetic proportional pressure reducing valves 12a, 12b. Details of this identification processing will be described later.
(Step S4)
Further, the external controller 32 inputs an electric signal to the solenoids of the electromagnetic proportional pressure reducing valves 12a and 12b of each spool 13 via the in-vehicle controller 15, and detects the pressure in the pilot chambers 13a and 13b by the pressure sensors 33 and 33. Then, a predetermined calibration process is performed. Details of this calibration process will also be described later.
(Step S5)
The external controller 32 determines whether or not the calibration process has been completed for the electromagnetic proportional pressure reducing valves 12a and 12b corresponding to all the spools 13. If it is determined in step S5 that the calibration process has not been completed for the electromagnetic proportional pressure reducing valves 12a and 12b corresponding to all the spools 13, the process returns to step S4. Exit external calibration mode.

  Next, the identification process will be described with reference to the flowchart shown in FIG.

In this identification process, the correspondence relationship between the electromagnetic proportional pressure reducing valves 12a and 12b of each spool 13 and the pressure sensor 33 is identified at the lowest possible pressure.
(Step S11)
The external controller 32 inputs an electric signal for setting the target pressure of the pilot chambers 13a, 13b to 0 to the solenoids of the electromagnetic proportional pressure reducing valves 12a, 12b of all the spools 13 via the in-vehicle controller 15.
(Step S12)
The external controller 32 determines whether any of the pressures in the pilot chambers 13a and 13b detected by the pressure sensors 33 exceeds a predetermined threshold value greater than zero. If it is determined that there is an object that exceeds the predetermined threshold value, the process proceeds to step S13. If it is determined that no object exceeds the predetermined threshold value, the process proceeds to step S14.
(Step S13)
The external controller 32 determines that the pressure sensor 33 whose detected pressure exceeds the predetermined threshold value is not connected to the connection tap TP (has a connection failure), and the subsequent external calibration mode. During this time, the output from the pressure sensor 33 is set to be ignored.
(Step S14)
The external controller 32 electromagnetically transmits a predetermined electric signal for setting the pressure in the pilot chambers 13a, 13b to a predetermined target pilot pressure set in advance with respect to the electromagnetic proportional pressure reducing valves 12a, 12b at both ends of any spool 13. The solenoids of the proportional pressure reducing valves 12a and 12b are input via the in-vehicle controller 15. The spool 13 as the target is changed every time the identification process is repeated, thereby enabling the identification process for all the spools 13. For the electromagnetic proportional pressure reducing valves 12a and 12b, the relationship between the target pilot pressure and the current value or voltage value of the input electric signal is stored in advance in the external controller 32 as a table or graph, for example.
(Step S15)
The external controller 32 determines whether or not the pressure is detected by the pressure sensor 33 within a predetermined time (for example, 5 seconds). If it is determined that it is not detected, it is determined that the pressure sensor 33 is not detected, and the process proceeds to step S16. If it is determined that it is detected, the process proceeds to step S17.
(Step S16)
The external controller 32 outputs an electrical signal for interrupting the external calibration mode to the in-vehicle controller 15 and ends the external calibration mode.
(Step S17)
Based on the output from the pressure sensor 33, the external controller 32 determines the correspondence relationship between the electromagnetic proportional pressure reducing valves 12a, 12b of the spool 13 and the pressure sensor 33, that is, which pressure sensor 33 is connected to which connection tap TP. Identify.
(Step S18)
The external controller 32 inputs an electric signal for setting the target pressure of the pilot chambers 13a, 13b to 0 to the solenoid of the electromagnetic proportional pressure reducing valves 12a, 12b of the spool 13 via the in-vehicle controller 15.
(Step S19)
The external controller 32 determines whether or not the identification of the correspondence relationship between the electromagnetic proportional pressure reducing valves 12a and 12b and the pressure sensor 33 has been completed for all the spools 13. If it is determined that the identification is not completed, the process proceeds to step S14. If it is determined that the identification is completed, the identification process is terminated.

  Next, the calibration process will be described with reference to the flowchart shown in FIG.

In this calibration process, as a rule, the calculation of the calibration amount when the target pilot pressure is relatively low (steps S21 to S26 below), and the calculation of the calibration amount when the target pilot pressure is relatively high (see below). Steps S27 to S32) and confirmation of each calibration result (Steps S33 to S40 described below) are sequentially performed.
(Step S21)
The external controller 32 outputs a low-pressure side electric signal, which is a predetermined electric signal for setting the same predetermined low-pressure side target pilot pressure, to the solenoids of the electromagnetic proportional pressure reducing valves 12a and 12b at both ends of any one spool 13. And input via the in-vehicle controller 15. The spool 13 as the target is changed every time the calibration process is repeated, thereby enabling the calibration process for all the spools 13. For the electromagnetic proportional pressure reducing valves 12a and 12b, the relationship between the low-pressure-side target pilot pressure and the current value or voltage value of the input electric signal is stored in advance in the external controller 32 as a table or graph, for example. .
(Step S22)
After elapse of a predetermined time, the external controller 32 determines whether or not the pressure detected by the pressure sensors 33 and 33 is within a predetermined low pressure side allowable range set in advance. If it is determined that any of the detected pressures is not within the predetermined low pressure side allowable range set in advance, the process proceeds to step S23, where it is determined that each detected pressure is within the predetermined low pressure side allowable range set in advance. If so, the process proceeds to step S24.
(Step S23)
The external controller 32 outputs an electrical signal for interrupting the external calibration mode to the in-vehicle controller 15 and ends the external calibration mode.
(Step S24)
The external controller 32 determines whether or not the differential pressure between the pressures detected by the pressure sensors 33 and 33 exceeds a predetermined value (for example, 400 kPa). If it is determined that the differential pressure exceeds the predetermined value, the spool 13 may move to either end and the fluid pressure actuator may operate, so the process proceeds to step S23. If it is determined that the differential pressure does not exceed the predetermined value, the process proceeds to step S25.
(Step S25)
The external controller 32 calculates the low-pressure side calibration amount based on the comparison result between the low-pressure side target pilot pressure and the pressure detected by the pressure sensors 33 and 33. Specifically, the differential pressure between the target pilot pressure on the low pressure side and the measured pilot pressure by each pressure sensor 33 is detected, and the calibration amount of the electric signal to the electromagnetic proportional pressure reducing valves 12a and 12b for calibrating the differential pressure is calculated. , Based on the input / output characteristics of the electromagnetic proportional pressure reducing valves 12a and 12b stored in advance.
(Step S26)
The external controller 32 inputs an electric signal for setting the target pressure to 0 to the solenoids of the electromagnetic proportional pressure reducing valves 12a and 12b at both ends of the spool 13 via the in-vehicle controller 15 to the electromagnetic proportional pressure reducing valves 12a and 12b. .
(Step S27)
The external controller 32 sends a high-pressure side electric signal, which is a predetermined electric signal for setting the same predetermined high-pressure side target pilot pressure, to the solenoids of the electromagnetic proportional pressure reducing valves 12a, 12b at both ends of the spool 13. Input through 15 respectively. For the electromagnetic proportional pressure reducing valves 12a and 12b, the relation between the high-pressure side target pilot pressure and the current value or voltage value of the input electric signal is stored in advance in the external controller 32 as a table or graph, for example. .
(Step S28)
After a predetermined time has elapsed, the external controller 32 determines whether or not the pressure detected by the pressure sensors 33 and 33 is within a predetermined high-pressure side allowable range set in advance. If it is determined that any one of the detected pressures is not within the predetermined high pressure side allowable range set in advance, the process proceeds to step S29, and each detected pressure is determined to be within the predetermined high pressure side allowable range set in advance. If so, the process proceeds to step S30.
(Step S29)
The external controller 32 outputs an electrical signal for interrupting the external calibration mode to the in-vehicle controller 15 and ends the external calibration mode.
(Step S30)
The external controller 32 determines whether or not the differential pressure between the pressures detected by the pressure sensors 33 and 33 exceeds a predetermined value (for example, 400 kPa). If it is determined that the differential pressure exceeds the predetermined value, the spool 13 may move to either end and the actuator may operate, so the process proceeds to step S29. If it is determined that the differential pressure does not exceed the predetermined value, the process proceeds to step S31.
(Step S31)
The external controller 32 calculates the high-pressure side calibration amount based on the comparison result between the high-pressure side target pilot pressure and the pressure detected by the pressure sensors 33 and 33. Specifically, the differential pressure between the target pilot pressure on the high pressure side and the actual pilot pressure measured by each pressure sensor 33 is detected, and the calibration amount of the electric signal to the electromagnetic proportional pressure reducing valves 12a and 12b for calibrating the differential pressure is calculated. , Based on the input / output characteristics of the electromagnetic proportional pressure reducing valves 12a and 12b stored in advance.
(Step S32)
The external controller 32 inputs an electric signal for setting the target pressure to 0 for the electromagnetic proportional pressure reducing valves 12a and 12b at both ends of the spool 13 to the solenoid of the electromagnetic proportional pressure reducing valves 12a and 12b via the in-vehicle controller 15. .
(Step S33)
The external controller 32 sets the predetermined low pressure side target pilot pressure to the solenoids of the electromagnetic proportional pressure reducing valves 12a and 12b at both ends of the spool 13 in a state where the low pressure side calibration amount calculated in step S25 is reflected. A predetermined low-voltage electric signal to be input is input via the in-vehicle controller 15.
(Step S34)
The external controller 32 confirms whether or not the pressure detected by the pressure sensors 33 and 33 is within a predetermined low pressure side tolerance.
(Step S35)
The external controller 32 sets the predetermined high pressure side target pilot pressure to the solenoids of the electromagnetic proportional pressure reducing valves 12a and 12b at both ends of the spool 13 in a state where the high pressure side calibration amount calculated in step S31 is reflected. A predetermined high-voltage side electric signal to be input is input via the in-vehicle controller 15.
(Step S36)
The external controller 32 confirms whether or not the pressure detected by the pressure sensors 33 and 33 is within a predetermined high-pressure side tolerance.
(Step S37)
The external controller 32 determines whether it is determined in step S34 or step S37 that it is within each tolerance. If it is determined in step 34 or step 37 that it is confirmed that it is not within each allowable tolerance, the process proceeds to step S38. If it is determined that it is within each allowable tolerance, the process proceeds to step S40.
(Step S38)
If it is not within the permissible tolerance, it is determined whether or not a predetermined multiple times (for example, three times) have been determined. If it is determined that it is not more than a predetermined number of times (less than a predetermined number of times), the process returns to step S33. If it is determined that the number of times is greater than or equal to the predetermined number of times, the process proceeds to step S39 as a timeout in the external calibration mode.
(Step S39)
The external controller 32 outputs an electrical signal for interrupting the external calibration mode to the in-vehicle controller 15 and ends the external calibration mode.
(Step S40)
The external controller 32 inputs an electrical signal for setting the target pressure to 0 for the electromagnetic proportional pressure reducing valves 12a and 12b at both ends of the spool 13 to the solenoid of the electromagnetic proportional pressure reducing valves 12a and 12b via the in-vehicle controller 15. Then, the calibration process is terminated, and the process proceeds to step S5.

  Next, effects of the embodiment shown in FIGS. 1 to 6 will be described.

  A predetermined electrical signal (low pressure side electrical signal or high pressure side electrical signal) from the external controller 32 is applied to the electromagnetic proportional pressure reducing valves 12a and 12b that form a pair for inputting pilot pressure to the pilot chambers 13a and 13b at both ends of one spool 13. The pilot pressure input to the pilot chambers 13a and 13b is actually measured by the pressure sensors 33 and 33, and the pilot pressures from the electromagnetic proportional pressure reducing valves 12a and 12b to the pilot chambers 13a and 13b of the spool 13 are measured by a predetermined electric signal. Based on the comparison result between the target pilot pressure assumed to be input and the actual pilot pressure, the external controller 32 (calculation unit) calculates the calibration amount of the actual pilot pressure with respect to the target pilot pressure. For this reason, since all the spools 13 can be automatically calibrated, compared to the conventional case in which the calibration amount is sequentially calculated manually with respect to the electromagnetic proportional pressure reducing valves 12a and 12b of each spool 13, a shorter time is required. Easy calibration is possible. Further, since the same pressure is input to the spool 13 by the electromagnetic proportional pressure reducing valves 12a and 12b at both ends, the spool 13 does not substantially move, and therefore the fluid pressure actuator operated by the movement of the spool 13 substantially It is possible to calibrate more safely when not in operation, and simultaneously calibrate the two electromagnetic proportional pressure reducing valves 12a and 12b corresponding to the expansion / contraction of the hydraulic cylinder and the forward / reverse rotation of the traveling motor and swing motor. Thus, calibration can be performed in a short time.

  In particular, since the external controller 32 has the function of the calculation unit, the external controller 32 and the pressure sensor 33 are externally attached even to the hydraulic excavator 1 in which the in-vehicle controller 15 does not have a function for calibration in advance. In addition to being able to easily perform automatic calibration by applying the calibration device 31, the calibration device 31 can be easily installed simply by connecting the external controller 32 and the pressure sensor 33 manually. Convenience is good.

  In addition, since the calibration amount is calculated for each spool 13 when the target pilot pressure is relatively low and when the target pilot pressure is relatively high, calibration can be performed with higher accuracy.

  In the above-described embodiment, the external calibration mode is configured to be performed for all spools 13. However, for the field response, a function for only at least one arbitrary spool 13 is selected. You may be able to do it.

  Further, although the calibration amount is calculated on the low pressure side and the high pressure side, only the calibration amount for one predetermined pressure can be calculated, or the calibration amount for three or more predetermined pressures can be calculated.

  Furthermore, the calibration device 31 and the calibration method are generally applicable to calibration of electronically controlled control valves other than work machines.

  Moreover, although the external controller 32 controlled the vehicle-mounted controller 15 in the said calibration method, for example, the vehicle-mounted controller 15 implements a calibration and the external controller 32 can also be made into the interface which transmits the pressure from the pressure sensor 33. . That is, the in-vehicle controller 15 may have the function of the calculation unit. In other words, the function of the calculation unit can be provided in at least one of the in-vehicle controller 15 and the external controller 32. In this case, the in-vehicle controller 15 is included in the calibration device 31.

  INDUSTRIAL APPLICABILITY The present invention has industrial applicability to businesses that manufacture and sell work machines such as hydraulic excavators or business operators that maintain and manage work machines.

11 Electronic control valve
12a, 12b Solenoid proportional pressure reducing valve
13 Spool
13a, 13b Pilot room
31 Calibration device
32 External controller that is a controller with the function of the calculation unit
33 Pressure sensor

Claims (2)

An electronically controlled control valve calibration device equipped with an electromagnetic valve that moves the spool by converting the electrical signal corresponding to the input operation into a pilot pressure and inputting this pilot pressure into the pilot chambers provided at both ends of the spool. There,
A pressure sensor for detecting each pilot pressure input to the pilot chamber of the spool;
A controller electrically connected to these pressure sensors;
A target pilot pressure that is expected to be input from the solenoid valve to the pilot chamber of the spool by a predetermined electrical signal, and this electrical signal are input to a pair of solenoid valves that input the pilot pressure to the pilot chambers at both ends of the spool. A calculation unit for calculating a calibration amount of the actual pilot pressure with respect to the target pilot pressure based on a comparison result with the actual pilot pressure detected by the pair of pressure sensors corresponding to each pilot chamber and input to the controller. An electronically controlled control valve calibration apparatus characterized by the above. An electronically controlled control valve calibration method that includes an electromagnetic valve that moves the spool by converting the electrical signal corresponding to the input operation into a pilot pressure and inputting this pilot pressure into the pilot chambers provided at both ends of the spool. There,
A predetermined electrical signal is input to each pair of solenoid valves that input pilot pressure to the pilot chambers at both ends of one spool, and the pilot pressure input to each pilot chamber is measured,
A calibration amount of the actual pilot pressure with respect to the target pilot pressure is calculated based on a comparison result between the target pilot pressure expected to be input from the solenoid valve to the pilot chamber of the spool by a predetermined electric signal and the actual pilot pressure. Electronic control valve calibration method.

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