JP2003206832A - Device and method for evaluating oil leakage of injector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for correctly and continuously measuring and evaluating any oil leakage of an injector. <P>SOLUTION: An oil leakage evaluating device for the injector to detect any fuel leakage from the injector 1 in a non-operating state comprises a vessel 2 facing an injection port 3 of the injector 1, a dilute gas feeder 17 to distribute a dilute gas to the vessel 2, and analyzers 22 and 23 to continuously measure the concentration of the predetermined composition constituting the fuel in the dilute gas. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for evaluating oiltight leak of an injector for injecting fuel into the vicinity of an intake port of an engine or the inside of a cylinder, and a method for evaluating oiltight leak.

[0002]

2. Description of the Related Art Recently, as a fuel supply device for an engine, an injector for injecting fuel has been used instead of a conventional carburetor. As an example thereof, there is known an injector in which fuel is pressurized by a fuel pump and is momentarily opened by an electric signal to inject the fuel.

According to this type of injector, the fuel supply amount and timing can be controlled quite freely, so that the effect of improving the power performance and fuel consumption of the engine is excellent. Further, since the injector is configured to inject the accumulated fuel, the pressure of the fuel becomes high even without intake air, that is, even when the engine is stopped. If the fuel is deteriorated, fuel may leak while the engine is stopped.

When the leaked fuel leaks to the outside in the form of steam in this manner, it may cause air pollution, and the fuel leaked in the cylinder may deteriorate engine startability. The leakage of fuel in such a closed state of the injector is called an oiltight leak, and the amount is called an oiltight leak amount. Therefore, it is necessary to evaluate whether or not the oil-tight leak has occurred before shipping the injector or mounting it on the actual engine, or to evaluate the degree of the oil-tight leak.

Conventionally, an example of a method for inspecting an oil-tight leak of an injector has been proposed by JP-A-5-302554. In the inspection method described in this publication, the injector is arranged from the master side passage toward the inspection side passage, and while the driving of the injector is stopped, the inspection reference pressure is accumulated in the master side passage and the inspection side passage Measure the time until the difference between the pressure in the master side passage and the pressure in the inspection side passage becomes zero in that state by increasing the volume and reducing the pressure, and measure the measured time and the expansion amount of the volume in the inspection side passage. This is a method of calculating the oiltight leakage amount from.

[0006]

According to the method described in the above publication, if the liquid tightness of the injector is lowered, the pressure difference becomes zero within a short time. The quality of the injector can be determined from the amount of oil-tight leakage below. However, in the above method, the time taken for the leaked fuel to fill the expanded volume of the inspection side passage in the form of vapor is measured, and the oil-tight leak amount within the measurement time is measured. Even if it is possible to evaluate the oiltight leak during that time, it is not possible to know how the oiltight leak occurs during that time. That is, there is an inconvenience that it is not possible to detect an oiltight leak state that is continuous in time.

The pressure is also influenced by the volume of the container and the volume of the fluid filling the container. On the other hand, in the above-described conventional method, when the leak amount is large, the pressure difference becomes zero in a short time, so that the measurement time is shortened while the leak amount is relatively small. Will increase the measurement time. Therefore, depending on the length of the measurement time, the volume and the degree of change in the volume differ due to the influence of the temperature within the measurement time, which may cause a decrease in measurement accuracy.

Further, in the method described in the above publication, the fuel leaking into the inspection side passage fills the inspection side passage, so that the pressure difference becomes zero.
It is necessary to keep the leaked fuel in the inspection side passage.
Therefore, the injection port of the injector is covered with the fuel, and as a result, there is a possibility that the oil-tight leak condition cannot be visualized.

The method described in the above publication is
Since the method focuses on the inspection or evaluation of the injector alone, the oil-tight leak measurement conditions are special, and it is not possible to perform measurement or evaluation with the engine mounted on the actual engine (that is, the actual machine). Behavior in
It may not be possible to accurately reflect it in the injector evaluation.

The present invention has been made by paying attention to the above technical problems, and an oil-tight leak of an injector can be accurately grasped, and an evaluation device capable of evaluating according to the state of an actual machine. And to provide an evaluation method.

[0011]

In order to achieve the above object, the invention according to claim 1 provides an oiltight leak evaluating device for an injector for detecting fuel leakage from an injector in a non-operating state. A container facing the injection port of the injector, a diluent gas supply device for circulating a diluent gas in the container, and an analyzer for continuously measuring the concentration of a predetermined component constituting the fuel in the diluent gas. The evaluation device is characterized by being provided.

Therefore, according to the first aspect of the invention, when the pressurized fuel is applied to the non-operating injector, oil-tight leakage is caused or not caused depending on the sealed state of the injection port. Therefore, a predetermined component in the fuel is mixed with the diluent gas flowing through the inside of the container facing the injection port, and the concentration thereof is measured by an analyzer. Therefore, the change in the oiltight leak amount corresponds to the concentration measured by the analyzer, and the state or amount of the oiltight leak can be continuously grasped, and as a result, the injector can be accurately evaluated.

In addition to the structure of claim 1, the invention of claim 2 is characterized in that at least a part of the container has a transparent structure in which the injection port can be visually recognized from the outside of the container. It is an evaluation device that does.

Therefore, according to the second aspect of the present invention, when oil-tight leak occurs in the injector, the leaked fuel is carried away by the diluent gas, and at least a part of the container has a transparent structure. Therefore, the injection port of the injector can be visualized, and as a result, the oil-tight leak can be grasped more accurately and the injector can be accurately evaluated.

According to a third aspect of the present invention, in an injector oiltight leak evaluation apparatus for detecting fuel leakage from a non-operating injector into an actual machine in which the injector is mounted, the actual machine facing the injection port of the injector An adapter for closing the space part, a diluent gas inlet and an outlet formed in the adapter so as to communicate with the space part, and a known amount of diluent gas connected to the diluent gas inlet are supplied. A diluent gas supply device, and an analyzer that communicates with the outlet and continuously measures the concentration of a predetermined component constituting the fuel in the diluent gas sent from the outlet. And the evaluation device.

Therefore, according to the third aspect of the invention, when the adapter is attached to the actual machine, the space portion facing the injection port of the injector is closed in the actual machine. In that state, a known amount of diluent gas is fed from the diluent gas supplier into the space, and the diluent gas flows out from the outlet to the analyzer.

Further, in the invention of claim 4, in addition to the structure of any one of claims 1 to 3, when the concentration obtained by the analyzer is increased above a predetermined level, the amount of the diluent gas is increased. It is evaluated that the apparatus further comprises a diluent gas increasing means for controlling the amount of diluent gas and a diluent gas amount maintaining means for maintaining the amount of diluent gas sent to the analyzer to the amount before the diluent gas increasing means increases the amount of diluent gas. It is a device.

Therefore, in the invention of claim 4, when the oil-tight leak amount increases and the concentration in the analyzer increases accordingly, the amount of the diluent gas is increased, so that the measurement range of the analyzer is exceeded. As the concentration is prevented from increasing and the amount of diluent gas supplied is increased, the amount of diluent gas supplied to the analyzer is maintained at the previous state, so that an excessive amount of gas is added to the analyzer. It is possible to avoid the situation in which the dilution gas is supplied and the concentration measurement becomes abnormal due to it.

Furthermore, in the invention of claim 5, in the oiltight leak evaluation method of an injector for detecting a leak of fuel from an injector in a non-operating state, a diluent gas is applied to a space portion facing the injection port of the injector. While circulating, the concentration of a predetermined component constituting the fuel contained in the diluent gas is continuously measured, and the oiltight leak amount of the injector is obtained based on the concentration and the flow rate of the diluent gas. Is an evaluation method.

Therefore, according to the fifth aspect of the invention, when the pressurized fuel is applied to the injector in the non-operating state, oil-tight leakage occurs or does not occur depending on the sealed state of the injection port. Therefore, a predetermined component in the fuel is mixed with the diluent gas flowing through the space facing the injection port, and the concentration thereof is measured. Therefore, the change in the oil-tight leak amount corresponds to the measured concentration, and the state or amount of the oil-tight leak can be continuously grasped, and as a result, the injector can be accurately evaluated.

The invention of claim 6 is the evaluation method according to the invention of claim 5, wherein the injector is mounted on an actual machine, and the space portion is a space portion of the actual machine.

Therefore, in the invention of claim 6, the oil-tight leak in the actual machine is detected by the method described in claim 5, so that the oil-tight leak can be detected and evaluated in accordance with the actual use condition of the injector. Will be possible.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described based on specific examples. In FIG. 1, the injector 1 is a container 2
Is attached to. The injector 1 is a fuel injection valve that is conventionally known as a device that directly injects fuel into a cylinder of a gasoline engine, a diesel engine, or the like, and is arranged with its injection port 3 facing the inside of the container 2. Has been done.

The injector 1 causes the pressure of fuel that is pressurized and supplied to act on the valve opening side and the valve closing side,
A solenoid (not shown) is driven so that the pressure difference is switched between the valve opening side and the valve closing side, and the injection timing and the fuel injection amount are controlled. An injector drive circuit 4 for driving the solenoid is provided.

The structure of the fuel supply system for pressurizing the fuel and supplying it to the injector 1 is the same as that conventionally known, and a delivery pipe 5 is connected to the injector 1. The delivery pipe 5 is a pipe-shaped member for temporarily storing (accumulating) pressurized fuel and distributing the pressurized fuel to the plurality of injectors 1.

A fuel pump 8 for pumping and pressurizing the fuel 7 from the fuel tank 6 is connected to one end of the delivery pipe 5. Further, a pressure regulator 9 for maintaining the pressure inside the delivery pipe 5 at a set pressure is connected to the other end of the delivery pipe 5, and the fuel flowing out from the pressure regulator 9 is fed to the fuel tank 6. It is supposed to be returned. In addition, the delivery pipe 5 and the pressure regulator 9
A pressure gauge 10 is connected between and.

The structure of the container 2 is shown in FIG. The container 2 forms a space having a predetermined volume, and in the example shown in the drawing, a rectangular parallelepiped space portion is formed inside.
The outer wall portion to which the injector 1 is attached (see FIGS. 1 and 2).
Two upper side wall portions), an inlet 11 for letting in the diluent gas and an outlet 12 for letting out the diluent gas.
And are formed. Further, the outer wall portion (bottom wall portion in FIGS. 1 and 2) facing the injection port 3 of the injector 1 has two transparent structures. This is a structure for visualizing the injection port 3 and its surroundings from the outside, and quartz glass 13 is fitted therein as an example.

A camera 14 for taking an image of the inside of the container 2, in particular, the injection port 3 and its surroundings is arranged outside the quartz glass 13 at a position facing the injection port 3. On the outside of the other quartz glass 13, a spotlight 15 for irradiating the jet port 3 and its surroundings with light is arranged.

Since the fuel injected from the injector 1 is sprayed on the inner surface of the quartz glass 13, the inflow port 11 directs the diluent gas toward the inner surface of the quartz glass 13 in order to promote its evaporation. It is preferable to form in a spraying direction.

The diluting gas is, for example, clean air, and is supplied to a pipe line 16 communicating a diluting gas source (not shown) such as an air pump or a cylinder with the inflow port 11.
Mass flow controller 1 that controls the flow rate of the dilution gas
7 is interposed. A bypass valve 18 is connected between the mass flow controller 17 and the inflow port 11 in the conduit 16, and a flow meter 19 is connected to the bypass valve 18. That is, by discharging a part of the diluent gas sent from the mass flow controller 17 through the bypass valve 18 and the flow meter 19, the inside of the container 2 is not depressurized and a predetermined amount of the diluent gas is supplied. It is adapted to be supplied to the inside of the container 2.

A purge switching valve 20 for selectively and directly flowing out the air inside the container 2 to the outside is connected to the outlet 12 of the container 2. The purge switching valve 20 is a so-called three-way switching valve, and a mass flow meter 21 that detects a flow rate and outputs a signal is provided to one of two ports other than the port communicating with the outlet 12. It is connected. Further, on the outflow side of the mass flow meter 21, an analyzer for measuring the concentration of any of the components constituting the fuel and outputting a signal is connected. Specifically, the total hydrocarbon analyzer 22 and alcohol (ethanol)
The analyzer 23 is connected.

Then, the mass flow meter 21 described above,
The total hydrocarbon analyzer 22 and the methanol analyzer 23 are
The data processing device 24 is connected so as to be capable of data communication. The data processing device 24 is mainly composed of a microcomputer as an example, and based on the flow rate sent from the mass flow meter 21 and the respective concentrations sent from the respective analyzers 22 and 23, the oil-tight leak of the injector 1 occurs. It is configured to calculate the quantity M _Fuel (mg / min).

The calculation is performed, for example, by the following equation (1).
Is done.    M_Fuel= Q * (γ₁* (C₁-R * C_Two) + Γ_Two* C_Two) * 10^-6       … (1) Where Q is the dilution gas flow rate (liter / min), C₁ Is full charcoal
Hydrogen fluoride analyzer indicated concentration (ppmC), C_Two Is ethanol
Analyzer concentration (ppm), γ₁Is the hydrocarbon density, γ _TwoIs
Ethanol density, r is the ethanol feel of a total hydrocarbon analyzer
It is a frequency coefficient.

Next, the operation of the above apparatus, that is, the method of the present invention will be described. FIG. 3 shows the procedure for detecting the oil-tight leak, and in a state where the respective devices are connected as shown in FIG. 1, as a step 1, air bleeding of the fuel supply line is performed. That is, the pressure regulator 9 is released, and the fuel pump 8 is driven to pressurize and supply the test fuel.

Next, as step 2, air is removed from the injector 1. Specifically, container 2
Air is supplied from the inflow port 11 to the inside of the container 2 in a state where the inside of the container is directly communicated with the outside by the purge switching valve 20, and in that state, the test fuel is injected into the container 2 from the injector 1.

In order to remove the fuel injected into the container 2 in this manner, the inside of the container 2 is purged as step 3. That is, the fuel pump 8 is stopped and the injector 1 is stopped, and in that state, air is circulated inside the container 2 for several minutes.

After the purging of the container 2 is completed, in step 4, the background of the container 2 is confirmed. The operations performed here are as follows. First,
The analyzers 22 and 23 are calibrated (calibrated), and then, with the analyzers 22 and 23 switched to the measurement mode, the hydrocarbon concentration and alcohol (ethanol) in the diluent gas that has passed through the inside of the container 2. ) Measure the concentration and wait until the indicated value stabilizes. In that case,
The purge switching valve 20 is switched so that the container 2 and the mass flow meter 21 are communicated with each other, and the flow rate set by the mass flow controller 17 is set higher than the sampling flow rate of each of the analyzers 22 and 23 so that the dilution gas is The part is allowed to flow out via the bypass valve 18. This is to suppress the depressurization of the container 2.

After the above preparatory operation is completed, step 5
As a result, the pressure regulator 9 is set to the test pressure. As an example, it is set to 300 kPa. By doing so, the fuel having the test pressure is applied to the injector 1, and the diluent gas having a predetermined flow rate is continuously supplied to the inside of the container 2. In this state, in step 6, the oiltight leak amount is measured and calculated (1). That is, the detection values of the analyzers 22 and 23 and the detection value of the mass flow meter 21 are loaded into the data processing device 24, and the above-mentioned (1) is performed.
Performs calculations using expressions. The oil-tight leak amount thus obtained is the oil-tight leak amount when the fuel pump 8 is driven to pressurize the fuel.

Next, in step 7, the fuel pump 8
In the state where the pressure is stopped and the pressure is accumulated in the delivery pipe 5, the measurement / calculation (2) of the oil-tight leak amount is executed as in the above case. Further, as step 8, the set pressure of the pressure regulator 9 is sequentially decreased, and the measurement / calculation (3) of the oil tight leakage amount under various fuel pressures is executed.

Since the oil-tight leak amount obtained as described above is the oil-tight leak amount at every moment, the above-described apparatus and method according to the present invention can continuously detect the oil-tight leak amount. You can As a result, the state of oiltight leakage can be grasped more accurately. Comparing this with the conventional one,
Conventionally, the total amount of oil-tight leak amount in a predetermined time width is detected, and it is not possible to know the change in the oil-tight leak amount in that time width, but in the device and method according to the present invention,
Even if the oil tight leak amount changes from moment to moment, the change can be accurately detected.

Further, in the above apparatus, since the injection port 3 and its surroundings inside the container 2 are visualized, the situation of oil-tight leak can be visually grasped, and the oil-tight leak can be detected more accurately. Will be things. In other words, the amount of information for countermeasures against oiltight leaks will be remarkably rich.

The present invention can also be constructed so as to detect and evaluate oil-tight leakage of the injector 1 attached to the actual machine. An example will be described below. The example shown in FIG. 4 is an example configured to use an adapter that is attached to and detached from the cylinder head 30, and the adapter is configured as a plate 31. That is, a plurality of injectors 1 described above are mounted on the cylinder head 30, a flat surface portion 32 for mounting an intake manifold or an exhaust manifold (not shown) is formed, and
An opening 33 such as an intake port or an exhaust port communicating with a space facing the injection port 3 of the injector 1 is formed in the flat portion 32.

The plate 31 is constructed so as to be closely attached to the flat surface portion 32 of the plate 31. Further, the injection port 34 and the outflow port 35 are connected to the opening 33 so as to communicate with the respective openings 33. A plurality of pairs are formed corresponding to the number of. The inlets 34 communicate with the mass flow controller 17 and the bypass valve 18 shown in FIG. Further, the outflow port 35 is connected to each of the analyzers 22 and 23 via the purge switching valve 20 and the mass flow meter 21 shown in FIG.

Although not shown in particular, the injection port 3
Attach a sleeve made of oil-resistant synthetic resin to 4,
If the diluent gas injection pipe is attached via the sleeve, the insertion length of the injection pipe can be adjusted according to the depth of the port in the cylinder head 30. Further, the other opening of the cylinder head 30 in FIG. 4 is hermetically closed to prevent leakage of diluent gas and fuel. Further, each injector 1 is communicated with the delivery pipe 5 (or common rail) held by the cylinder head 30.

The measurement and calculation of the oil-tight leak amount in the actual machine shown in FIG. 4 are executed according to the procedure shown in FIG. Therefore, it is possible to continuously and accurately measure and evaluate the oil-tight leak of the injector 1 mounted on the actual machine. In this case, even if a temperature change occurs, the oil tight leak amount can be continuously detected based on the temperature change, so that the oil tight leak amount detection accuracy is improved.

FIG. 5 is a view showing the result of measuring the oil-tight leak amount by mounting the two injectors 1 on the cylinder head 30, and after driving the fuel pump 8 for 10 seconds,
The result when leaving it in the state where the pressure was accumulated in the delivery pipe 5 is shown. In the example shown in FIG. 5, injector A
In the non-driving state of the fuel pump 8, an oil-tight leak of about 0.3 mg / min occurs, and after the fuel pump 8 is stopped after being driven, the oil-tight leak amount rapidly increases to about 0.7 mg / min. , And then the oil leak amount gradually decreased.
On the other hand, in the injector B, oil-tight leak did not occur in the non-driving state of the fuel pump 8, but after the fuel pump 8 was stopped after being driven, 0.05 mg / min
A slight oil tight leak occurred.

As described above, in the device according to the present invention, the oil-tight leak amount in the actual machine can be detected every moment, the oil-tight leak detection accuracy is improved, and the oil-tight leak state can be grasped accurately.

As each of the analyzers 22 and 23, an analyzer capable of setting the measurement range in a plurality of stages is known. When this type of analyzer is used, the oil-tight leak amount increases and the dilution is performed. Even if the concentration in the gas becomes high, the measurement accuracy of each analyzer can be maintained. However, when the concentration increases to the extent that it exceeds the upper limit of the measurement range, the measurement accuracy decreases and it becomes impossible to measure the concentration. In such a case, the configuration as shown in FIG. 6 may be provided. it can.

In the example shown in FIG. 6, when the total hydrocarbon concentration or alcohol (ethanol) concentration increases above a predetermined value, the mass flow controller 17 is controlled to increase the flow rate of the diluent gas, and in accordance with this, Analyzer 2
This is an example in which a bypass passage is provided to maintain the amount of the diluent gas flowing into 2, 2 and 23 almost in the same manner as before. More specifically, the mass flow controller 17 is configured so that the flow rate set value is controlled by the data processing device 24. The mass flow controller 17 and the container 2 are directly connected to each other, and the bypass shown in FIG. Valve 18
Are not provided.

In addition, the mass flow meter 21 and each analyzer 2
A check valve 25 is connected by bypass between 2 and 23, and a flow meter 26 is connected to the downstream side of the check valve 25. Then, a specified amount or more of the dilution gas for each of the analyzers 22 and 23 is discharged to a predetermined location via the check valve 25 and the flow meter 26.

Therefore, in the configuration shown in FIG. 6, even if the oil-tight leak amount increases, the measurement is performed while suppressing the concentration within the measurement range of each analyzer 22, 23. The precision can be maintained at high precision. In addition,
The configuration for changing the dilution rate shown in FIG. 6 can be applied to the evaluation test in the actual machine shown in FIG.

The relationship between each of the above-described embodiments and the present invention will be briefly described below. The mass flow controller 17 for supplying a dilution gas such as air to the container 2 or the cylinder head 30, the bypass valve 18, and so-called upstream. The configuration on the side corresponds to the dilution gas supply device of the present invention,
Either or both of the total hydrocarbon analyzer 22 and the alcohol analyzer 23 correspond to the analyzer of the present invention. Furthermore, the configuration for increasing the flow rate setting value of the mass flow controller 17 by the data processing device 24 corresponds to the dilution gas increasing means of the present invention, and the configuration for exhausting the check valve 25 and the like maintains the dilution gas amount of the present invention. It corresponds to the means.

The present invention is not limited to the above-described specific examples. In addition to changing the pressurization state of the fuel to measure the oil-tight leak amount, the atmospheric temperature is changed sequentially. It is also possible to measure the oiltight leak amount for each temperature. Further, the measurement may be performed only by the total hydrocarbon analyzer without using the alcohol analyzer.

[0054]

As described above, according to the first aspect of the present invention, the dilution gas circulated inside the container facing the injection port of the non-operating injector responds to the oil-tight leak condition. As a result, the predetermined components in the fuel are mixed and the concentration is measured by the analyzer, so the change in the oiltight leak amount corresponds to the concentration measured by the analyzer. The injector can be accurately evaluated by continuously checking the state or amount of leakage.

According to the second aspect of the invention, when oil-tight leak occurs in the injector, the leaked fuel is carried away by the diluent gas, and at least a part of the container has a transparent structure. As a result, the injection port of the injector can be visualized, and as a result, the oil leak can be more accurately grasped and the injector can be accurately evaluated.

Further, according to the invention of claim 3, when the adapter is attached to the actual machine, the space part facing the injection port of the injector is closed in the actual machine, and in that state, the known space from the dilution gas supplier to the space part is known. Amount of diluent gas is fed in, and the diluent gas flows from the outlet to the analyzer,
Since the fuel component in the diluted gas is measured by the analyzer, the oil-tight leak in the actual machine can be accurately detected.

Further, according to the invention of claim 4, in addition to the same effect as that of the invention of any one of claims 1 to 3, the oil-tight leak amount increases, and the concentration in the analyzer increases accordingly. If it rises, the amount of diluent gas is increased,
The increase in concentration beyond the range measured by the analyzer is avoided, and the amount of diluent gas supplied to the analyzer is maintained at the previous state in accordance with the increase in the amount of diluent gas supplied. Therefore, it is possible to avoid a situation in which an excessive amount of dilution gas is supplied to the analyzer, or the concentration measurement becomes abnormal due to the supply.

On the other hand, according to the fifth aspect of the present invention, the dilution gas circulated in the space facing the injection port of the non-operating injector has a predetermined amount in the fuel depending on the state of oiltight leakage. Because the ingredients are mixed and their concentration is measured,
Since the change in the oiltight leak amount and the measured concentration correspond to each other, the state or amount of the oiltight leak can be continuously grasped,
As a result, the injector can be evaluated accurately.

According to the invention of claim 6, the oil-tight leak in the actual machine is detected by the method described in claim 5, so that the oil-tight leak according to the actual use condition of the injector is detected. Enables detection and evaluation.

[Brief description of drawings]

FIG. 1 is a system diagram schematically showing an example of an apparatus according to the present invention.

FIG. 2 is a schematic cross-sectional view showing the configuration of the container shown in FIG.

3 is a flow chart for explaining a procedure for measuring an oil tight leak amount using the apparatus shown in FIG. 1, that is, a method of the present invention.

FIG. 4 is a schematic view showing an example of an adapter according to the present invention.

5 is a diagram showing a result of measuring an oil-tight leak amount using the adapter shown in FIG.

FIG. 6 is a system diagram schematically showing another example of the device according to the present invention.

[Explanation of symbols]

1 ... Injector, 2 ... Container, 3 ... Injection port, 5
… Delivery pipe, 7… Fuel, 8… Fuel pump,
11 ... Inlet, 12 ... Outlet, 13 ... Quartz glass,
17 ... Mass flow controller, 22 ... Total hydrocarbon analyzer, 23 ... Alcohol (ethanol) analyzer,
25 ... Check valve, 30 ... Cylinder head, 31 ... Plate, 34 ... Injection port, 35 ... Outflow port.

Claims (6)

[Claims] 1. An injector oiltight leak evaluation apparatus for detecting fuel leakage from a non-operating injector, comprising: a container facing the injector injection port; and a diluent gas supply device for circulating a diluent gas through the container. And an analyzer for continuously measuring the concentration of a predetermined component constituting the fuel in the diluted gas, the oiltight leak evaluation device for an injector. 2. The oiltight leak evaluation device for an injector according to claim 1, wherein at least a part of the container has a transparent structure in which the injection port can be visually recognized from the outside of the container. 3. An injector oiltight leak evaluation device for detecting fuel leakage from a non-operating injector into an actual machine equipped with the injector, wherein a space in the actual machine facing the injection port of the injector is provided. A closing adapter, a diluent gas inlet and an outlet formed in the adapter so as to communicate with the space, and a diluent gas supplier connected to the diluent gas inlet and supplying a known amount of diluent gas. An injector oil, which is connected to the outlet and continuously measures the concentration of a predetermined component constituting the fuel in the diluent gas sent from the outlet. Spill leak evaluation device. 4. A diluent gas increasing means for increasing the amount of the diluent gas when the concentration obtained by the analyzer increases above a predetermined level, and an amount of the diluent gas sent to the analyzer to the diluent gas. 4. The injector oiltight leak evaluation device according to claim 1, further comprising: a diluent gas amount maintaining device for maintaining the diluent gas amount at the amount before increasing the diluent gas amount. 5. An injector oiltight leak evaluation method for detecting fuel leakage from a non-operating injector, wherein a diluent gas is caused to flow through a space portion facing the injection port of the injector, and Injector oil-tight leak evaluation, characterized in that the concentration of a predetermined component that constitutes the fuel is continuously measured and the oil-tight leak amount of the injector is obtained based on the concentration and the flow rate of the diluent gas. Method. 6. The injector is mounted on an actual machine,
The oiltight leak evaluation method for an injector according to claim 5, wherein the space portion is a space portion of the actual machine.