JPH10287228A - Inspecting device for fluid pressure device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect abnormality without receiving an influence of a pressure drop, in an inspecting device for a fluid pressure device performing detection of abnormality in the fluid pressure device based on a flow amount of air passing through a fluid pressure circuit. SOLUTION: In a precision regulator 20, air of prescribed pressure is supplied through an atmospheric tank 24 and a pipe 25 to a feed air port 10a of an ABS assembly 10. An exhaust port 10b communicates with an atmospheric side through a pipe 28, Pitot tube 30 and a pipe 31. In a flow meter 32, a flow amount of air circulating the Pitot tube 30 is detected. In an input side of the air tank 24 and an atmospheric opening side end part of the feed air port 10a, exhaust port 10b and the pipe 31, respectively a pressure gage 35, 36, 37, 38 are arranged. In a decision device 42, based on an output of the pressure gage 35 to 38, a flow amount detected by the flow meter 32 is corrected, based on this correction value, whether abnormality is provided or not in the ABS assembly 10 is decided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inspecting a hydraulic apparatus, and more particularly to an apparatus for inspecting a hydraulic apparatus for determining the presence or absence of an abnormality based on the flow rate of gas flowing through the hydraulic apparatus.

[0002]

2. Description of the Related Art Antilock brake control (hereinafter referred to as AB)
Brake control such as S control) is realized by controlling the wheel cylinder pressure by a hydraulic device incorporating a hydraulic circuit. The hydraulic circuit includes a hydraulic passage formed inside the hydraulic device, and hydraulic components such as valves and orifices for controlling the flow of oil in the hydraulic passage. If a problem such as defective processing of the hydraulic passage or abnormality of the hydraulic component occurs, the hydraulic circuit cannot operate normally. For this reason, it is necessary to inspect the presence or absence of the above-mentioned problem after the assembly of the hydraulic device. However, since the hydraulic circuit incorporated in the hydraulic device has a complicated configuration, it is difficult to directly inspect a malfunction of the hydraulic device.

For this reason, conventionally, when air of a predetermined pressure is supplied to one of the ports of a hydraulic device, the flow rate of air flowing out of another port is measured to determine whether there is a problem with the hydraulic device. Inspection has been carried out simply. That is, for example, when an abnormality such as a clogging of a hydraulic passage or a hydraulic component that decreases the opening degree of the hydraulic circuit occurs, the air flow rate decreases as compared with a normal state. In addition, if an abnormality such as a failure in sealing a hydraulic component that increases the opening degree of the hydraulic circuit occurs, the air flow rate increases as compared with a normal state. Based on such a change in the air flow rate, it is possible to determine whether or not there is an abnormality in the hydraulic device.

[0004] As a device for detecting an outflow amount of air, for example, a flow rate detecting device disclosed in Japanese Patent Application Laid-Open No. 62-2125 is known. The conventional flow rate detection device detects the flow rate of air flowing out of the tank to be measured, and includes a reference tank, an air source for supplying air at a predetermined pressure to the reference tank and the tank to be measured, and a pressure in the reference tank. , A communication passage connecting the reference tank and the tank to be measured, and an on-off valve for controlling conduction and cutoff of the passage. When detecting the air flow rate, first, air with a predetermined pressure is supplied from the air pressure source to the reference tank and the tank to be measured while the on-off valve is closed and the communication between the reference tank and the tank to be measured is cut off. Is done. Next, with the supply of air from the air pressure source shut off, the on-off valve is opened to connect the reference tank and the tank to be measured. Then, the flow rate of the air flowing out of the tank to be measured is determined based on the time change of the pressure in the reference tank after the opening / closing valve is opened.

[0005]

Incidentally, the flow rate of air flowing out of the tank to be measured changes depending on the pressure of the tank to be measured. On the other hand, in the above-mentioned conventional flow rate detection device, the flow rate of air flowing out of the measured tank is detected based on a change in pressure of the reference tank. That is, the above conventional flow rate detecting device detects the flow rate of air flowing out of the measured tank, assuming that the pressure of the reference tank is equal to the pressure of the measured tank.

[0006] However, in the above-mentioned conventional flow rate detecting device, the reference tank and the tank to be measured are communicated through a communication passage provided with an on-off valve. That is, the air in the reference tank flows into the tank to be measured through the communication passage and the on-off valve. In this case, pressure loss occurs due to the flow resistance of the communication passage and the on-off valve. Therefore, the pressure of the measured tank is lower than the pressure of the reference tank by the amount of the pressure loss. Further, the magnitude of the pressure loss changes depending on the flow rate of the air passing through the communication passage, that is, the flow rate of the air flowing out of the tank to be measured. Therefore, in order to accurately detect the amount of outflow of air from the tank to be measured based on the change in pressure in the reference tank, it is necessary to compensate for the change in air flow rate due to the pressure loss in some way. However,
In the above conventional flow rate detecting device, no consideration is given to the influence of the pressure loss between the tank to be measured and the reference tank.

As described above, according to the above conventional flow rate detecting device, it is not always possible to accurately detect the outflow amount of air from the tank to be measured due to the occurrence of pressure loss. Therefore, when the above-mentioned conventional flow rate detecting device is applied to the inspection of the hydraulic device, there is a possibility that the presence or absence of the abnormality of the hydraulic device cannot be accurately determined. The present invention has been made in view of the above-described points, and determines whether or not there is an abnormality in a hydraulic device in which a hydraulic circuit is incorporated, by compensating for the effect of pressure loss due to the flow of air, thereby reducing the air flow rate. It is an object of the present invention to provide an inspection device for a hydraulic device, which can accurately determine a hydraulic device based on the information.

[0008]

The above object is achieved by the present invention.
As described in the above, a hydraulic device inspection device for inspecting the presence or absence of abnormality in a hydraulic device in which a hydraulic circuit is incorporated, a pressure source that generates a gas of a predetermined pressure, and the pressure source is the hydraulic pressure An air supply passage communicating with any one port of the device, an exhaust passage communicating another port with the other port of the hydraulic device to the atmosphere side, and a gas flow rate flowing through the exhaust passage. A flow rate detecting means for detecting the pressure;
Differential pressure detecting means for detecting a differential pressure between the two ports, correcting means for correcting the gas flow rate based on the differential pressure, and abnormality of the hydraulic device based on the gas flow rate corrected by the correcting means. And a determination unit for determining the presence or absence of the hydraulic pressure device.

In the present invention, the air supply passage connects the air pressure source to any one port of the hydraulic device (hereinafter, referred to as an air supply port). Therefore, air at a predetermined pressure is supplied to the air supply port. The exhaust passage communicates a port (hereinafter, referred to as an exhaust port) different from the air supply port of the hydraulic device to the atmosphere. Therefore, the air supplied to the air supply port flows through the hydraulic circuit in the hydraulic device, and flows out from the exhaust port to the atmosphere via the exhaust passage. The flow rate detecting means detects a flow rate of the air flowing through the exhaust passage. Accordingly, the flow rate detecting means detects the flow rate of the air flowing through the hydraulic device. When an abnormality occurs in the hydraulic device, the flow rate of air flowing through the hydraulic device changes from the normal state. Therefore, it is possible to determine whether or not the hydraulic device is abnormal based on the flow rate of the air flowing through the hydraulic device.

Incidentally, a pressure loss occurs when air flows through the air supply passage and the exhaust passage. Due to such pressure loss, the differential pressure between the supply port and the exhaust port of the hydraulic device becomes smaller than the predetermined pressure of the air generated by the air pressure source. Due to the change in the differential pressure, the flow rate of the air flowing through the hydraulic device changes. The correcting means corrects the air flow detected by the flow detecting means based on the differential pressure. Therefore, regardless of the magnitude of the pressure loss in the supply passage and the exhaust passage, the flow rate of the air flowing through the hydraulic device is corrected to a value corresponding to a constant differential pressure. The determining means determines whether there is an abnormality in the hydraulic device based on the air flow rate corrected by the correcting means. Therefore, regardless of the magnitude of the pressure loss,
The presence or absence of an abnormality in the hydraulic device is accurately determined.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a system configuration diagram of an inspection apparatus for a hydraulic device (hereinafter, simply referred to as an inspection apparatus) according to an embodiment of the present invention. In this embodiment, the inspection device is A
It is determined whether or not the BS assembly 10 is abnormal. ABS
The assembly 10 is a hydraulic device having a function of executing ABS control by a hydraulic circuit incorporated therein. The hydraulic circuit includes a hydraulic passage formed in the ABS assembly 10 and hydraulic components such as an electromagnetic valve and an orifice assembled in the hydraulic passage. There are two independent circuits, a left hydraulic circuit for controlling the right hydraulic circuit and a right hydraulic circuit for performing the hydraulic control on the right front wheel and the left rear wheel. The hydraulic circuit of each system includes a master cylinder port to which a master cylinder is connected and a wheel cylinder port to which a wheel cylinder is connected.

In the inspection apparatus of this embodiment, when air of a predetermined pressure is supplied to one of the master cylinder port or the wheel cylinder port for each system of the hydraulic circuit for ABS, the air flows out of the other port. Based on air flow,
It detects the presence or absence of an abnormality in the ABS assembly 10. That is, when a malfunction such as a processing failure of the hydraulic passage formed inside the ABS assembly 10 or an abnormality of a hydraulic component assembled in the hydraulic passage occurs, the opening degree of the hydraulic circuit changes, Air flow rate changes from normal value. The presence or absence of an abnormality in the ABS assembly 10 can be detected based on the change in the air flow rate. The port of the ABS assembly 10 to which air at a predetermined pressure is supplied is hereinafter referred to as an air supply port 10a. The port through which the air supplied from the air supply port 10a flows is hereinafter referred to as an exhaust port 10b.

As shown in FIG. 1, the inspection apparatus of the present embodiment
An air source 20 for generating high-pressure air is provided. air
The source 20 includes an input port 22a of a precision regulator 22.
Is connected. The precision regulator 22 has an output port
The pressure on the side 22b is a predetermined pressure P _RIt is opened and closed so that
You. Therefore, the output port 22b of the precision regulator 22
Has a predetermined pressure P_RPrecisely controlled pressure of air output
Is done. The output port 22b of the precision regulator 22 is
ABS via pipe 23, air tank 24 and pipe 25
Connected to the air supply port 10a of the assembly 10.
You. The air tank 24 is connected via the precision regulator 22
Supplied pressure P_RConfigured to store air
I have. A valve 26 is provided in the pipe 25.
You. Therefore, when the valve 26 is opened, the air tank 2
The air inside 4 is the air supply port 10 of the ABS assembly 10
a.

Exhaust port 10 of ABS assembly 10
One end of a pitot tube 30 is connected to b through a pipe 28. The other end of the pitot tube 30 is open to the atmosphere via a pipe 31. The pitot tube 30 has a flow meter 3
2 are connected. The flow meter 32 is configured to measure the flow rate of air flowing through the pitot tube 30 based on the pressure difference between two points inside the pitot tube 30, that is, the volume flow rate of air per unit time. The pipe 33 has a valve 33
Are arranged. When the valve 33 is opened, the air supplied to the air supply port 10a flows to the ABS assembly 1
0 through the hydraulic circuit, and from the exhaust port 10b to the pipe 2
8, is discharged into the atmosphere via the pitot tube 30 and the tube 31. At this time, the flow rate of the air flowing through the pitot tube 30 by the flow meter 32, that is, the ABS assembly 10
Is measured. The pitot tube 3
Instead of the zero and the flow meter 32, any other known flow detecting means may be used. Hereinafter, an air distribution system from the air source 20 to the pipe 31 is referred to as an air supply system 34.

The piping 23, the connecting portion between the piping 25 and the air supply port 10a of the ABS assembly 10, the piping 28 and the AB
A connection portion of the S assembly 10 with the exhaust port 10b;
Further, pressure gauges 35, 36, 37, and 38 are provided at ends of the pipe 31 on the open side to the atmosphere, respectively. In FIG. 1, the points where the pressure gauges 35, 36, 37, and 38 are disposed are denoted by points A, B, C, and D, respectively.
Indicated by. The pressure gauges 35, 36, 37, and 38
Both are connected to the determination device 42. Pressure gauge 35, 3
6, 37 and 38 determine output signals corresponding to the air pressure at points A, B, C and D, respectively, by the determination device 42.
Output to. The judgment device 42 includes pressure gauges 35 to 38
Pneumatic P _A, P _B, P at the point A~D from the output signal of the
_C and P _D are detected, and the presence or absence of an abnormality in the ABS assembly 10 is determined based on the air pressures P _A , P _B , P _C and P _D.

A control device 44 is connected to the determination device 42. The control device 44 is composed of an arithmetic device with an input / output device such as a personal computer. Through the control device 44, the operator inputs a command to start the test (test start command) and displays the test result. The valves 26 and 33 are connected to a control device 44 and are opened and closed according to a control signal given from the control device 44.

The inspection apparatus of the present embodiment is based on the air flow rate Q when a constant differential pressure is applied between the air supply port 10a and the exhaust port 10b of the ABS assembly 10.
This is to determine whether or not the ABS assembly 10 is abnormal. Therefore, in order to make such a determination accurately, it is necessary to find the air flow rate Q when a certain differential pressure is generated between the air supply port 10a and the exhaust port 10b.

As described above, the air tank 24 and the ABS assembly 10 are connected to each other by the pipe 25 having the valve 26. Therefore, the predetermined pressure P in the air tank 24
_{The R} air passes through the pipe 25 and the valve 26 and passes through the ABS.
This will reach the air supply port 10a of the assembly 10. In this case, pressure loss ΔP ₁ is generated due to resistance when air flows through the pipe 25 and the valve 26. The exhaust port 10b of the ABS assembly 10 includes a pipe 28 having a valve 33, a pitot pipe 30, and a pipe 3
1 is open to the atmosphere. Therefore, the air flowing out of the exhaust port 10b is supplied to the pipe 28 and the valve 33,
The gas passes through the pitot tube 30 and the pipe 31 and is released to the atmosphere. In this case, due to resistance when air flows through the pipes 28 and 31, the valve 33, and the pitot tube 30,
Pressure loss ΔP ₂ occurs.

FIG. 2 shows an air supply system 3 of the inspection apparatus of this embodiment.
4 shows the pressure distribution in FIG. As shown in FIG. 2, by the pressure loss [Delta] P ₁ and [Delta] P _2, the pressure at point B, ie the pressure in the air supply port 10a of the ABS port 10 is lower by [Delta] P ₁ than pressure P _R where precision regulator 22 outputs . In addition, the point C, that is, the distribution port 10
The pressure at b is higher than the atmospheric pressure P ₀ by ΔP ₂ .
As a result, the differential pressure P _E between the supply port 10a and the exhaust port 10b is (P _R −P ₀ −ΔP ₁ −ΔP ₂ ). Thus, the differential pressure P _E is determined by the pressure losses ΔP ₁ and ΔP
It will vary depending on the value of ₂ .

Therefore, a constant differential pressure P_EExhaust port against
In order to obtain the air flow rate Q of the air from the
The measured value Q of the air flow rate by the
ΔP ₁And ΔP_TwoNeeds to be compensated for. Take
To make the compensation, pipe 25 and valve 26, and
With pipes 28 and 31, pitot tube 30, and valve 33
The resulting pressure loss ΔP₁, ΔP_TwoIs experimentally determined in advance.
To the measured value of the air flow rate Q based on the experimental value.
It is also conceivable to make corrections.

However, when a plurality of inspection devices are used, the values of the pressure losses ΔP ₁ and ΔP ₂ change for each device. Therefore, even when the inspection of the ABS assembly 10 having the same specification is performed, the correction amount for the measured value of the air flow rate Q changes by the inspection device. For this reason, it is necessary to adjust the correction amount for each inspection apparatus, and the inspection procedure becomes complicated.

In general, the pressure loss increases as the air flow rate increases. On the other hand, the magnitude of the air flow rate Q for a given pressure difference P _E varies depending on the specification of the ABS assembly 10. Therefore, when testing the ABS assemblies 10 having different specifications by the same inspection apparatus, the magnitudes of the pressure losses ΔP ₁ and ΔP ₂ change depending on the specifications of the ABS assemblies 10. FIG. 3 shows an ABS having a larger air flow rate than the case shown in FIG.
4 shows a pressure distribution in the air supply system 34 when the assembly 10 is inspected. As shown in FIG. 3, as the air flow rate Q increases, the pressure losses ΔP ₁ and ΔP ₂ increase, and accordingly, the differential pressure P _E between the supply port 10a and the exhaust port 10b decreases. I have. As described above, since the magnitudes of the pressure losses ΔP ₁ and ΔP ₂ vary depending on the specifications of the ABS assembly 10, it is difficult to obtain accurate ΔP ₁ and ΔP ₂ in advance for the ABS assemblies of various specifications. Therefore, ABS assemblies 10 of various specifications can be used.
When the inspection is performed, the abnormality determination cannot be performed accurately.

On the other hand, in the system according to the present embodiment, the influence of the above-mentioned pressure losses ΔP ₁ and ΔP ₂ is automatically compensated by the judging device 42, so that the correction amount with respect to the air flow rate Q for each inspection device. It is characterized in that it is not necessary to adjust the ABS assembly 10 and it is possible to accurately determine the abnormality of the ABS assembly 10 regardless of the type of the ABS assembly 10 to be inspected.

Hereinafter, the determination device 42 which is a feature of the present invention will be described.
Will be described with reference to FIG. FIG. 4 is a system configuration diagram of the determination device 42. As shown in FIG.
The determination device 42 is a central processing unit (hereinafter referred to as a CPU) 5
0 is provided. To the CPU 50 via a bus 52,
A ROM memory 54, a RAM memory 56, a communication interface 58, an A / D input interface 60, and a digital signal input / output interface 62 are connected.

The communication interface 58 includes a flow meter 3
2 are connected. In addition, analog input interface
The pressure gauges 35, 36, 37 and 38 are in contact with the base 60.
Has been continued. The CPU 50 is a communication interface 5
8 and input via analog input interface 60
Flow meter 32 and pressure gauges 35, 36, 37, and 3
8 based on the output signal of
The air flow rate Q flowing out of the port 10b and the points A, B,
Air pressure P at points C and D_A, P_B, P _C,as well as
P_DIs detected.

Digital signal input / output interface 62
Is connected to the control device 44. The CPU 50
By transmitting and receiving signals to and from the control device 44 via the digital signal input / output interface 62, it is recognized that an inspection start command has been input to the control device 44, and after the inspection is completed, the inspection result is transmitted to the control device 44. Display.

The CPU 50 executes the program stored in the ROM memory 54 while using the RAM memory 56 as a work amount memory. Hereinafter, referring to FIG.
The contents of the processing executed by U50 will be described. FIG. 5 is a flowchart of a routine executed by the CPU 50 in the present embodiment. When this routine is started, first, the process of step 100 is executed. In step 100, the self-diagnosis of the determination device 42, that is, in step 100, diagnosis of the presence / absence of abnormality in the RAM memory 56, the communication interface 58, the analog signal input interface 60, and the digital input / output interface 62 is performed. As a result of the self-diagnosis, when an abnormality is detected in the determination device 42, an abnormality process is next performed in step 102. On the other hand, if it is confirmed in step 100 that no abnormality has occurred in the determination device 42, then
Step 104 is executed.

In step 104, it is determined whether or not an inspection start command has been input to the control device 44 by the operator. When the operator completes the preparation for inspection by connecting the pipes 25 and 28 to the air supply port 10a and the exhaust port 10b corresponding to the hydraulic circuit of either one of the systems of the ABS assembly 10, the control is started. An inspection start command is input to the device 44. Therefore, step 10
In 4, if the inspection start command has not been input to the control device 44, it is determined that the preparation for the inspection has not been completed yet, and the process of step 102 is executed again. on the other hand,
If the inspection start command is input to the control device 44, it is determined that the preparation for the inspection has been completed.
Subsequent inspection processing is performed. When an inspection start command is input to the control device 44, the control device 44
By opening the valves 6 and 33, air is allowed to flow through the ABS assembly 10.

In step 106, the flow rate Q of air flowing through the ABS assembly 10 is detected based on the signal input from the flow meter 32. When the process of step 106 is completed, the process of step 108 is executed. In step 108, based on the signals input from the pressure gauges 35, 36, 37 and 38, the pressures P _A , P _B , P _C and P _{D at the} points _A , _B , _C and _{D are determined.}
Is detected. When the processing of step 108 is completed,
Next, the process of step 110 is performed.

In step 110, the differential pressure between the point B and the point C, that is, the differential pressure P _E between the supply port 10a and the exhaust port 10b of the ABS assembly 10, P _E = (P _B −
P _C ) is calculated. When the process of step 110 is completed, at the next step 112, the pressure difference between points A and D, i.e., the differential pressure P _w of the pressure P _R and the atmospheric pressure P ₀ at the outputs of the precision regulator 22 = (P _A -P _D) is calculated. When the process of step 112 is completed, next, in step 114, a correction operation is performed on the air flow rate Q detected in step 104 based on the following equation.

Q _C = Q · P _w / P _E (1) As described above, the denominator P _{E on} the right side of the equation (1) is the pressure difference between the ports 10a and 10b of the ABS assembly 10, and the numerator P _w is the pressure difference between the pressure P _R and the atmospheric pressure P ₀ where precision regulator 22 outputs. The air flow rate Q flowing through the ABS assembly 10 depends on the ports 10a, 1
Changes in proportion to the differential pressure P _E between 0b. Therefore, (1)
By performing the correction calculation of the expression, the ABS assembly 1
0 when the pressure difference (P _R -P ₀ ) is applied between the ports 10a and 10b, that is, the pressure losses ΔP ₁ and ΔP ₂
There the air flow rate Q _C of the case of the zero is calculated.
Since it is accurately controlled by the pressure P _R is a precision regulator 22, the differential pressure (P _R -P ₀₎ is kept constant. Thus, (1) that the correction operation of the expression is carried out, even when the pressure loss [Delta] P ₁ and [Delta] P ₂ varies, always results in the air flow rate Q _c for a given differential pressure is determined.

When the process of step 114 is completed, the process of step 116 is executed. Step 11
In 6, whether Q _H> Q _C> Q _L is satisfied or not. Here, each of the Q _H and Q _L, with respect to the normal ABS assembly 10, port 10a, when the constant differential pressure (P _R -P ₀₎ is applied to between 10b, the upper limit of the air flow rate Q And the lower limit. Therefore, step 116
If Q _H> Q _C> Q _L is judged to be established in, then, in step 118, it is currently testing A
The BS assembly 10 is determined to be normal. On the other _{hand, Q H> Q C> Q} L in step 120 if it is determined that is not satisfied, then, in step 116, it is determined that the ABS assembly 10 which is currently examined is abnormal. When the processing in steps 118 and 120 is completed, the result of the determination in step 118 or 120 is output to the control device 44 in step 122. The control device 44 displays the presence or absence of an abnormality in the ABS assembly 10 based on the above determination result and closes the valves 26 and 33. When the processing in step 122 is completed, the ABS assembly 10
Inspection of the hydraulic circuit of the other system in
In preparation for the inspection of the S assembly 10, step 10 is repeated.
4 is executed.

As described above, according to the present embodiment, the above-described step
In step 110, the air flow rate is compensated based on equation (1).
By executing the positive operation, the pressure loss ΔP₁And ΔP_Two
, Regardless of the value of_R−P₀)
Air flow rate Q_cCan be requested. Therefore,
Pressure loss ΔP ₁
And ΔP_TwoChanges, the ABS assembly
As the air flow rate Q changes depending on the specifications of the
Power loss ΔP₁And ΔP_TwoChanges, the ABS
It is possible to accurately determine the abnormality of the assembly 10.
ing.

As described above, the influence of the pressure losses ΔP ₁ and ΔP ₂ is compensated for by the judging device 42, so that the pressure loss Δ
Suppressing the magnitudes of P ₁ and ΔP ₂ , for example, pipe 2
It is not necessary to consider the provision of 3, 25, 28, 31 thick and short. Therefore, according to the present embodiment, it is possible to reduce the size and cost of the inspection apparatus by eliminating the restrictions on the design of the air supply system 34 regarding the pressure losses ΔP ₁ and ΔP _2. ing.

It is to be noted that a plurality of air supply systems 34 are provided for the judging device 42, and the inspection is performed simultaneously on the left and right hydraulic circuits incorporated in the ABS assembly 10, thereby shortening the inspection time. it can. in this case,
By compensating the influence of the pressure loss for each air supply system 34 by the determination device 42, it is unnecessary to design the air supply system 34 so that the pressure losses ΔP ₁ and ΔP ₂ are equal to each other. Therefore, according to the present embodiment, when a plurality of air supply systems 34 are provided, the cost of the inspection apparatus can be further reduced.

In the above embodiment, the above (1)
By performing the correction operation using the equation, the ABS assembly 1
Pressure differential between the supply air port 10a and the exhaust port 10b of 0 was to determine the air flow rate Q _C in the case of (P _R -P _0). However, it is not always necessary to determine the air flow rate Q _C in the case of differential pressure (P _R -P _0), determine the air flow rate Q _C0 = Q / per unit pressure difference (P _B -P _C), the Q
_The abnormality determination may be performed based on _C0 .

In the above embodiment, air is used as the gas flowing through the ABS assembly 10.
The invention is not limited to this, and any inert gas such as nitrogen can be used. In the above embodiment, the air source 20 is connected to the air pressure source described in the first aspect, and the air tank 24 and the pipe 25 are connected to the air supply passage described in the first aspect.
1 corresponds to the exhaust passage described in claim 1, the pitot tube 30 and the flow meter 32 correspond to the flow rate detection means described in claim 1, respectively, and the CPU 50 performs the processing in step 110 of the routine shown in FIG. By executing, the differential pressure detecting means performs the processing of steps 112 and 114, and the correcting means according to claim 1 performs the processing of steps 116 to 120. The determination means described in 1 is realized respectively.

[0038]

As described above, according to the present invention, regardless of the magnitude of the pressure loss in the air supply passage and the exhaust passage,
An air flow rate for a constant differential pressure can always be obtained. Therefore, according to the inspection apparatus for a hydraulic device according to the present invention, the inspection of the hydraulic device can be accurately performed without being affected by the pressure loss.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an abnormality detection device for a hydraulic device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a pressure distribution in an intake system of the detection device of the present embodiment.

FIG. 3 is a diagram showing a pressure distribution in an air supply system when an air flow rate flowing through an ABS assembly is larger than that shown in FIG. 2;

FIG. 4 is a system configuration diagram of a determination device included in the inspection device of the present embodiment.

FIG. 5 is a flowchart of a routine executed by a CPU of the determination device.

[Explanation of symbols]

 Reference Signs List 10 ABS assembly 20 Air source 24 Air tank 25, 28, 31 Piping 30 Pitot tube 32 Flow meter 35, 36, 37, 38 Pressure gauge 42 Judgment device 50 CPU

Claims (1)

[Claims] 1. An inspection apparatus for a hydraulic device for inspecting whether a hydraulic device in which a hydraulic circuit is incorporated has an abnormality, comprising: a pressure source for generating a gas of a predetermined pressure; An air supply passage communicating with any one port of the device, an exhaust passage communicating a port other than the one port of the hydraulic device to the atmosphere side, and a gas flow rate flowing through the exhaust passage. Flow rate detecting means for detecting, differential pressure detecting means for detecting a differential pressure between the two ports of the hydraulic device, correcting means for correcting the gas flow rate based on the differential pressure, correction by the correcting means Determining means for determining whether or not there is an abnormality in the hydraulic device based on the detected gas flow rate.