JP4003028B2 - Electromagnetic valve inspection device and electromagnetic valve inspection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve inspection apparatus and an electromagnetic valve inspection method for inspecting response characteristics of an electromagnetic valve, and more particularly to an on or off operation of a drive pulse for an electromagnetic valve that controls the flow of fluid by reciprocating a valve member. The period required for the valve member to transition to the fully open state or the period required for the valve member to transition to the fully open state from the ON or OFF operation of the drive pulse (hereinafter referred to as “the drive pulse from the ON or OFF operation to the valve A period required for the member to shift to the fully open state, or a period required for the valve member to shift to the fully open state from the ON operation or OFF operation of the drive pulse is referred to as a response period), The present invention relates to an electromagnetic valve inspection method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an injector that injects fuel into a combustion chamber of an internal combustion engine (hereinafter referred to as an “internal combustion engine”) is known as an electromagnetic valve that controls the flow of fluid by reciprocating a valve member. In general, in a gasoline engine injector, when a driving pulse is applied to a solenoid, the solenoid attracts the movable iron core, and a valve member that reciprocates together with the movable iron core separates from the valve seat so that fuel flows and the fuel is injected from the nozzle. .
[0003]
As a method for inspecting the response period of such an injector, a method for inspecting the response period by measuring a change in the waveform of the drive current flowing through the solenoid is known.
In general, when the injector is driven, as shown in FIG. 4, the drive current starts to flow through the solenoid due to the ON operation of the drive pulse, and the drive current increases with the passage of time. When the valve member starts to be lifted by the suction force of the solenoid and the end of the valve member collides with the stopper inside the injector, the valve member is fully opened. When the valve member is fully lifted and stopped, an inflection point appears in the waveform change of the drive current. According to the above-described inspection method, the response period To at the time of valve opening is inspected by obtaining a period from when the driving pulse is turned on until this inflection point is measured.
[0004]
As another method for inspecting the response period, a method for inspecting the response period by measuring the displacement of the valve member is known. According to this method, after drilling the injector to be inspected, the displacement of the valve member is measured from the hole, and the response period is obtained from the correlation between the on / off operation of the drive pulse and the displacement.
[0005]
[Problems to be solved by the invention]
However, there are some injectors in which an inflection point does not appear in the change in the waveform of the drive current flowing through the solenoid when the valve member is fully lifted. In the case of such an injector, there is a problem that the response period when the valve is opened cannot be inspected by the method of inspecting the response period by measuring the change in the waveform of the drive current. When the drive pulse is turned off to close the valve, the drive current flowing through the solenoid becomes zero almost simultaneously with the drive pulse off operation. After the drive current flowing through the solenoid is attenuated and the valve member starts moving in the valve seat direction, the drive current waveform does not change during the period until the valve member is fully opened. In the method of inspecting the response period, there is a problem that the response period Tc when the valve is closed cannot be inspected.
[0006]
On the other hand, when the response period is inspected by measuring the displacement of the valve member, there is a problem in that it is not possible to inspect all the injectors because the injector to be inspected requires drilling.
[0007]
The present invention was created to solve such a problem, and an electromagnetic valve inspection device and an electromagnetic valve inspection method capable of reliably inspecting the total number of response periods when opening and closing the electromagnetic valves. The purpose is to provide.
[0008]
[Means for Solving the Problems]
According to the electromagnetic valve inspection device of the first aspect of the present invention, the pipe that is detachably connected to the end of the body of the electromagnetic valve supplies fluid to the fluid passage formed in the body. Energization of the solenoid of the solenoid valve is controlled by a drive pulse transmitted by the control means. When the solenoid is energized, the valve member sits on or separates from the valve seat. When the valve member is seated on the valve seat, the fluid passage is blocked, and when the valve member is separated from the valve seat, the fluid passage is opened.
[0009]
The solenoid valve is fully opened when the valve member is lifted from the closed state and the valve member collides with the stopper, so that the body vibrates simultaneously with the valve member being lifted and fully opened. Further, since the valve member moves in the valve seat direction from the valve open state and collides with the valve seat, the valve member is fully opened, so that the body vibrates simultaneously with the valve member being fully opened. The vibration propagation member in contact with the body propagates the vibration of the body to the vibration detection means. When the vibration propagates to the vibration detecting means, the vibration detecting means transmits an electric signal corresponding to the vibration. Therefore, the driving pulse is turned on by using the driving pulse of the control means and the electric signal transmitted from the vibration detecting means by the calculating means. By calculating the period from the operation or off operation until the vibration of the body is detected, the response period at the time of the on-off valve can be reliably inspected. In addition, since it is not necessary to perforate the solenoid valve to be inspected, all the solenoid valves can be inspected.
[0010]
According to the electromagnetic valve inspection method of the second aspect of the present invention, fluid is supplied to the fluid passage of the electromagnetic valve, and energization of the solenoid is controlled by a drive pulse to open or close the valve member, thereby vibrating the body. By detecting the collision between the valve member and the valve seat or the collision between the valve member and the stopper, and calculating the period from the ON or OFF operation of the drive pulse to the collision, the response time when opening and closing the valve is ensured Can be inspected. In addition, since it is not necessary to perforate the solenoid valve to be inspected, all the solenoid valves can be inspected.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example showing an embodiment of the present invention will be described.
FIG. 1 shows an electromagnetic valve inspection apparatus 1 according to an embodiment of the present invention. The electromagnetic valve inspection apparatus 1 is an apparatus that inspects response characteristics when an injector 90 as an inspection target is opened and closed.
[0012]
The rotary table 70 is a disk-like member that is rotated by a driving device (not shown), and has a work attachment hole 73 formed in the vicinity of the outer periphery. A throwing portion 72 is provided on the inner wall of the work attachment hole 73, and the throwing portion 72 comes into contact with the flange portion of the injector 90 and engages the injector 90 with the work attachment hole 73. The rotary table 70 is for improving work efficiency and is not necessarily provided in the present invention.
[0013]
Above the attachment hole 73, a pipe 10 for supplying inspection oil to the injector 90 instead of gasoline is provided. The pipe 10 is provided with a pump 12 for pumping oil from the tank 11 to the injector 90. One end of the pipe 10 is provided in the tank 11 for storing the inspection oil, and the other end is provided with a pipe connecting means 13 for connecting the injector 90 and the pipe 10. A seal member 14 that can reciprocate is provided at one end of the pipe coupling means 13. The seal member 14 is urged toward the injector 90 by a compression coil spring (not shown).
[0014]
An air cylinder 60 is provided below the attachment hole 96. At the upper end of the air cylinder 60, a support member 61 in which a hole 62 into which the tip end of the injector 90 is inserted is provided. Since there is a minute gap between the inner wall of the hole 62 and the outer wall of the injector 90, the injector 90 can reciprocate along the inner wall of the hole 62.
[0015]
On the upper surface of the support member 61, a metal contact member 31 in which a mounting hole 34 is formed is provided. The contact member 31 is locked to the support member 61 so as to be movable in a direction perpendicular to the axis of the injector 90. The abutting member 31 abuts on an end surface perpendicular to the axis of the injector 90 from below.
[0016]
A metal vibrating bar 32 capable of pressing the contact member 31 in a direction perpendicular to the axis of the injector 90 is provided. The vibrating bar 32 is supported by driving means 33 that reciprocates the vibrating bar 32 in the left-right direction in FIG. One end of the vibrating bar 32 and one end of the contact member 31 have a shape that engages so that the axial displacement of the injector 90 is equal to each other. The contact member 31 and the vibration bar 32 constitute a vibration propagation member in the present invention, and the contact member 31 and the vibration bar 32 may be integrally formed.
[0017]
The vibration bar 32 is provided with an accelerometer 20 as vibration detection means. The accelerometer 20 has a vibrating body that can reciprocate within a coil provided therein, and transmits an electric signal corresponding to the vibration to the computing means 50 by a change in impedance caused by the vibrating body moving in the coil.
[0018]
The control means 40 transmits a driving pulse, applies a driving current to the solenoid 96 by a voltage driving method, and drives the injector 90. The microcomputer 50 as the calculation means calculates the delay of vibration generated in the injector 90 with respect to the ON operation or the OFF operation of the drive pulse, using the drive pulse of the control means 40 and the output of the accelerometer 20.
[0019]
For example, the response period of the injector 90 that injects fuel into a combustion chamber of a gasoline engine can be inspected as an inspection target of the electromagnetic valve inspection device 1. Fuel passages 91 and 92, a valve seat 99, and a stopper 94 are formed in the body 93 of the injector 90. On the upstream side of the valve seat 99, a needle valve 95 and a movable iron core 98 as a valve member are accommodated so as to be reciprocally movable. The needle valve 95 blocks the fuel passage 91 and the fuel passage 92 by being seated on the valve seat 99, and connects the fuel passage 91 and the fuel passage 92 by being separated from the valve seat 99. The needle valve 95 and the movable iron core 98 are fixed integrally and are urged toward the valve seat 99 by a compression coil spring 97. A solenoid 96 for attracting the movable iron core 98 is provided on the upstream side of the movable iron core 98. The stopper 94 is formed to limit the lift amount of the needle valve 95, and the maximum lift amount of the needle valve 95 is obtained at the position where the movable iron core 98 abuts against the stopper 94. In the present invention, the stopper only needs to be in contact with the movable iron core or the needle valve from the upstream side.
[0020]
Hereinafter, the operation of the electromagnetic valve inspection apparatus 1 will be described.
As shown in FIG. 2, the injector 90 is attached to the mounting hole 73 of the turntable 70, the turntable 70 is rotated, and the injector 90 is moved above the air cylinder 60. Thus, when the injector 90 is moved to the inspection position, the air cylinder 60 is at the bottom dead center position, the seal member 14 is at the top dead center position, and the vibrating bar 32 is at the position moved to the right in FIG. .
[0021]
After the injector 90 is moved above the air cylinder 60, the air cylinder 60 is driven to move the contact member 31 and the support member 61 to the injector 90 side, and the tip of the injector 90 is moved to the contact member 31 and the support member. The injector 90 is inserted between the upper end surface of the contact member 31 and the lower end surface of the seal member 14. At this time, when the injector 90 moves upward in FIG. 2, the stepped portion 72 of the attachment hole 73 and the flange portion of the injector 90 are separated from each other, and the upper end surface of the injector 90 presses the lower end surface of the seal member 14. Next, the driving means 33 moves the vibrating bar 32 in the left direction in FIG. 2, engages the abutting member 31 and the vibrating bar 32, and presses the abutting member 31 with the vibrating bar 32. Thus, the injector 90 is clamped in the axial direction and the abutting member 31 is pressed by the vibrating rod 32, whereby the inner wall of the mounting hole 34 is pressed against the outer wall of the injector 90, and the axial vibration of the injector 90 is caused by the vibrating rod 32. Easy to propagate.
[0022]
After the above-described steps, the injector 90 is set as shown in FIG. 1, and then the pump 12 is driven to pump the inspection oil from the tank 11 to the injector 90. When the drive pulse of the control means 40 is turned on and a drive current is passed through the solenoid 96, the fixed iron core 98 is attracted by the solenoid 96 and the needle valve 95 is separated from the valve seat 99. When the needle valve 95 is separated from the valve seat 99, the inspection oil is injected from the injection hole of the injector 90 through the fuel passage 92. When the drive pulse of the control means 40 is turned off, the drive current flowing through the solenoid 96 is interrupted, the fixed iron core 98 is urged by the compression coil spring 97 and moves to the valve seat 99 example, and the needle valve 95 is moved to the valve seat 99. Sit down. When the needle valve 95 is seated on the valve seat 99, the flow of the inspection oil to the fuel passage 92 is interrupted, and the injection of the injector 90 is stopped.
[0023]
When the drive pulse of the control means 40 is turned on and the needle valve 95 is fully opened, the needle valve 95 is lifted and the movable iron core 98 collides with the stopper 94. When the drive pulse of the control means 40 is turned off and the needle valve 95 is fully opened, the needle valve 95 collides with the valve seat 99 and is seated. The collision between the movable iron core 98 and the stopper 94 and the collision between the needle valve 95 and the valve seat 99 propagate from the body 93 to the contact member 31 and propagate to the accelerometer 20 through the vibration rod 32.
[0024]
When vibration propagates to the accelerometer 20, an electrical signal corresponding to the vibration is transmitted from the accelerometer 20 to the calculation means 50. The calculating means 50 monitors the on / off of the drive pulse of the control means 40, and calculates the time difference between the time when the vibration measured by the accelerometer 20 occurs and the time of the on / off action of the drive pulse. The response period of the injector 90 is inspected.
[0025]
After the response period inspection is completed, the pump 12 is stopped, the vibrating bar 32 is moved to the right in FIG. 1, and the contact member 31 and the support member 61 are moved downward. Next, the rotary table 70 is rotated to move the subsequent injector to be inspected above the air cylinder 60.
[0026]
According to the electromagnetic valve inspection apparatus 1, as shown in FIG. 3, the time when the needle valve 95 is fully opened and the time when the movable iron core 98 collides with the stopper 94 completely coincide with each other. The response time To when the injector 90 is opened can be accurately inspected from the time difference from the time when the vibration is measured by 20. In addition, since the time when the needle valve 95 is fully opened and the time when the needle valve 95 collides with the valve seat 99 completely coincide, the time difference between the time when the drive pulse is turned off and the time when vibration is measured by the accelerometer 20 is obtained. The response period Tc when the injector 90 is closed can be accurately inspected. Further, since the injector 90 is inspected without any processing, 100% inspection is possible.
[0027]
In the present embodiment, the inspection object of the electromagnetic valve inspection device 1 has been described only for the injector, but the valve member has a structure that collides with a stopper or a valve seat when the valve is opened and closed, and the reciprocating motion of the valve member is a solenoid drive pulse. The response period can be inspected by using the electromagnetic valve inspection device of the present invention if the electromagnetic valve is controlled by the above.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an electromagnetic valve inspection apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic view showing an electromagnetic valve inspection apparatus according to an embodiment of the present invention.
FIG. 3 is a timing chart for explaining the operation of the electromagnetic valve inspection apparatus according to the present invention.
FIG. 4 is a timing chart for explaining the operation of a conventional solenoid valve inspection device.
[Explanation of symbols]
1 Solenoid valve inspection device 10 Pipe 20 Accelerometer (vibration detection means)
31 Contact member (vibration propagation member)
32 Vibrating rod (vibration propagation member)
40 Control means 50 Calculation means 90 Injector (solenoid valve)
91, 92 Fuel passage (fluid passage)
93 Body 94 Stopper 95 Needle valve (valve member)
96 Solenoid 98 Movable iron core (valve member)
99 Valve seat

Claims (2)

A body having a fluid passage, a valve seat, and a stopper, a solenoid, and a reciprocating movement between the valve seat and the stopper in response to a driving current of the solenoid to be seated on the valve seat or to be separated from the valve seat A device for inspecting a response characteristic of a solenoid valve having a valve member that opens and closes the fluid passage,
A pipe that is detachably connected to an upstream end of the body and supplies fluid to the upstream fluid passage;
Vibration detecting means for transmitting an electrical signal in response to vibration;
A vibration propagation member that contacts the body and propagates vibrations of the body to the vibration detection means;
Control means for transmitting a drive pulse for controlling energization of the solenoid;
Calculating means for calculating a period of time from when the drive pulse is turned on or off to when the vibration of the body is detected, using the drive pulse of the control means and the electrical signal transmitted from the vibration detection means; Prepared,
After moving the solenoid valve above the air cylinder, the air cylinder is driven to move the contact member and the support member toward the solenoid valve, and the tip of the solenoid valve is moved to the contact member and the support. Inserted into the member, clamp the solenoid valve at the upper end surface of the contact member and the lower end surface of the seal member,
At this time, when the solenoid valve moves in the direction toward the seal member, the stepped portion of the mounting hole and the flange portion of the solenoid valve are separated from each other, and the upper end surface of the solenoid valve is separated from the lower end surface of the seal member. Press and
Next, the vibrating rod is moved by the driving means, and the contact member is pressed against the contact member,
An electromagnetic valve inspection apparatus, wherein the electromagnetic valve is clamped in an axial direction and the contact member is pressed by the vibrating rod . A body having a fluid passage, a valve seat, and a stopper, a solenoid, and a reciprocating movement between the valve seat and the stopper in response to a driving current of the solenoid to be seated on the valve seat or to be separated from the valve seat A method for inspecting a response characteristic of a solenoid valve having a valve member that opens and closes the fluid passage,
A fluid supply step of supplying a fluid to the upstream fluid passage;
An opening / closing drive step for controlling energization of the solenoid by a drive pulse to open or close the valve member;
A collision detection step of detecting a collision between the valve member and the valve seat or a collision between the valve member and the stopper by measuring vibration of the body;
Calculating a period from the ON operation or OFF operation of the drive pulse to the collision, and
After moving the solenoid valve above the air cylinder, the air cylinder is driven to move the contact member and the support member toward the solenoid valve, and the tip of the solenoid valve is moved to the contact member and the support. Inserted into the member, clamp the solenoid valve at the upper end surface of the contact member and the lower end surface of the seal member,
At this time, when the electromagnetic valve moves in the direction toward the seal member, the stepped portion of the mounting hole and the flange portion of the electromagnetic valve are separated from each other, and the upper end surface of the electromagnetic valve presses the lower end surface of the seal member. And
Next, a method for inspecting an electromagnetic valve characterized in that the vibrating rod is moved by a driving means and engaged with the contact member to press the corresponding contact member .

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