JP3885588B2 - Injector oil-tight leak evaluation apparatus and evaluation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for evaluating oil-tight leakage of an injector that injects fuel near an intake port of an engine or inside a cylinder, and a method for evaluating oil-tight leakage.
[0002]
[Prior art]
Recently, an injector for injecting fuel has been used instead of a conventional carburetor as a fuel supply device for an engine. As an example, there is known an injector that injects fuel by pressurizing the fuel by a fuel pump and instantaneously opening the valve by an electric signal or the like.
[0003]
According to this type of injector, the amount and timing of fuel supply can be controlled fairly freely, so that the engine power performance, fuel efficiency, and the like are excellent. Further, since the injector is configured to inject the accumulated fuel, the fuel pressure increases even when there is no intake air, that is, even when the engine is stopped. If the performance is reduced, fuel may leak while the engine is stopped.
[0004]
If the fuel leaked in this way leaks to the outside in the form of vapor, it becomes a pollution factor of the atmosphere, and the fuel leaked into the cylinder may be a factor of deteriorating the startability of the engine. Such fuel leakage in the closed state of the injector is referred to as oil-tight leakage, and the amount thereof is referred to as oil-tight leakage. Therefore, it is necessary to evaluate whether or not an oil-tight leak has occurred before shipping the injector or mounting it on an actual engine, or the degree of the oil-tight leak.
[0005]
Conventionally, an example of a method for inspecting an oil-tight leak of an injector is proposed by Japanese Patent Laid-Open No. 5-302554. In the inspection method described in this publication, the injector is disposed from the master-side passage toward the inspection-side passage, and the inspection reference pressure is accumulated in the master-side passage in a state where the drive of the injector is stopped. Measure the time until the difference between the pressure on the master side passage and the pressure on the inspection side passage becomes zero in that state, and measure the time and the amount of expansion of the volume on the inspection side passage. This is a method of calculating the oil-tight leak amount from
[0006]
[Problems to be solved by the invention]
According to the method described in the above publication, if the liquid tightness of the injector is reduced, the pressure difference becomes zero within a short time. The quality of the injector can be determined. However, in the above method, the time until the fuel leaked fills the expanded volume of the inspection side passage in the form of steam is measured, and the amount of oil-tight leakage within the measurement time is measured. Even if the oil-tight leak during that time can be evaluated, it is impossible to know how the oil-tight leak occurs during that time. That is, there is an inconvenience that a continuous oil-tight leak state cannot be detected.
[0007]
The pressure is also affected by the volume of the container and the volume of fluid filling the container. On the other hand, in the conventional method described above, when the amount of leakage is large, the pressure difference in a short time becomes zero, so the measurement time is shortened, while the amount of leakage is relatively small. Increases the measurement time. Therefore, depending on the length of the measurement time, the degree of change in the volume or volume varies depending on the temperature within the measurement time, and this may cause a decrease in measurement accuracy.
[0008]
Further, in the method described in the above publication, the fuel leaked into the inspection side passage fills the inspection side passage, and the pressure difference becomes zero. It is necessary to stay. Therefore, the injection port of the injector is covered with fuel, and as a result, there is a possibility that the state of oil-tight leakage cannot be visualized.
[0009]
And since the method described in said gazette is a method which mainly focuses on the inspection or evaluation of the injector alone, the measurement condition of the oil-tight leak is special and in a state where it is mounted on an actual engine (that is, an actual machine). In this respect, there is a possibility that the behavior in the actual machine cannot be accurately reflected in the evaluation of the injector.
[0010]
The present invention has been made paying attention to the above technical problem, and can accurately grasp the oil-tight leak of the injector and can be evaluated according to the state in the actual machine. Is intended to provide.
[0011]
[Means for Solving the Problem and Action]
  In order to achieve the above object, an invention according to claim 1 is an oil-tight leak evaluation apparatus for an injector that detects leakage of fuel from a non-operating injector, and a container that faces the injection port of the injector, A dilution gas supply device for circulating a dilution gas in a container, and an analyzer for continuously measuring the concentration of a predetermined component constituting the fuel in the dilution gasAnd a data processing device for calculating an oil-tight leak amount of the injector from the flow rate of the dilution gas and the concentration of a predetermined component constituting the fuel in the dilution gas.It is an evaluation device characterized by havingThe
The predetermined component constituting the fuel may be a hydrocarbon or an alcohol as described in claim 2.
The invention of claim 3 is the oil tight leak evaluation apparatus for an injector according to claim 1 or 2, further comprising a fuel supply system that pressurizes the fuel and supplies the fuel to the injector. .
Further, the invention according to claim 4 is the invention according to claim 3, wherein the data processing device is configured such that when the fuel is pressurized by driving the fuel supply system, when the fuel is accumulated by stopping the driving of the fuel supply system, and An injector for evaluating oil-tight leaks of an injector, characterized in that the set pressure of the fuel is sequentially decreased and oil-tight leaks at various fuel pressures are continuously calculated.
[0012]
  ClaimsFrom 1 to 4Clearly, when pressurized fuel is applied to a non-operating injector, an oil-tight leak may or may not occur depending on the sealed state of the injection port. Therefore, a predetermined component in the fuel is mixed with the dilution gas circulated inside the container facing the injection port according to the state of oil-tight leakage, and the concentration is measured by the analyzer. For this reason, the change in the oil leak rate corresponds to the concentration measured by the analyzer., Oil by data processing equipmentThe state or amount of tight leak can be grasped continuously, and as a result, the injector can be accurately evaluated.
[0013]
  Also billedItem 5The invention claimsAny one of 1 to 4In addition to the configuration, the evaluation apparatus 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.
[0014]
  Therefore billingItem 5According to the invention, when an oil-tight leak occurs in the injector, in addition to the leaked fuel being carried away by the dilution gas, at least a part of the container has a transparent structure. As a result, the injector can be accurately evaluated by more accurately grasping the oil-tight leak.
[0015]
  ClaimItem 6The invention relates to an oil tight leak evaluation apparatus for an injector that detects leakage of fuel from a non-operating injector into an actual machine in which the injector is mounted, and an adapter that closes a space in the actual machine facing an injection port of the injector A dilution gas inlet and an outlet formed in the adapter so as to communicate with the space, a dilution gas supplier that supplies a known amount of dilution gas connected to the dilution gas inlet, and An analyzer that continuously communicates with the outlet and continuously measures the concentration of a predetermined component constituting the fuel in the dilution gas sent from the outlet.And a data processing device for calculating an oil-tight leak amount of the injector from the dilution gas flow rate and the concentration of a predetermined component constituting the fuel in the dilution gas.It is characterized by havingCriticismDevice.
[0016]
  Therefore billingItem 6In the present invention, when the adapter is attached to the actual machine, the space part where the injection port of the injector faces in the actual machine is closed. In that state, a known amount of dilution gas is fed into the space from the dilution gas supply device, and the dilution gas flows out from the outlet to the analyzer.The Then, the concentration of the predetermined component in the fuel is measured by the analyzer, and further, the state or amount of the oil-tight leak can be continuously grasped by the data processing device, and as a result, the injector can be accurately evaluated.
[0017]
  In addition, billingItem 7The invention does not have claim 16In addition to any configuration, when the concentration obtained by the analyzer increases more than a predetermined value, dilution gas increasing means for increasing the amount of dilution gas, and the amount of dilution gas sent to the analyzer, The dilution gas increasing means further comprises dilution gas amount maintaining means for maintaining the amount before increasing the dilution gas amount.Characteristic characterized byDevice.
[0018]
  Therefore billingItem 7In the invention, when the amount of oil-tight leak increases and the concentration in the analyzer increases accordingly, the amount of dilution gas is increased, so that it is avoided that the concentration increases beyond the measurement range by the analyzer. In addition, as the amount of dilution gas supplied increases, the amount of dilution gas supplied to the analyzer is maintained in the previous state, so that an excessive amount of dilution gas is supplied to the analyzer, Along with this, situations such as abnormalities in concentration measurement are avoided.
[0019]
  Still further, billingItem 8The invention relates to an oil-tight leak evaluation method for an injector that detects leakage of fuel from a non-operating injector, and the diluent gas is circulated in a space portion facing the injection port of the injector and is included in the diluent gas The evaluation method is characterized in that the concentration of a predetermined component constituting 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 dilution gas.
[0020]
  Therefore billingItem 8In the invention, when pressurized fuel is applied to the non-operating injector, 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 diluted gas circulated through the space where the injection port faces in accordance with the state of oil-tight leakage, and the concentration is measured. Therefore, the change of 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.
[0021]
  And billingItem 9Invention claimsItem 8In the invention, the injector is mounted on a real machine, and the space portion is a space portion in the real machine.
[0022]
  Therefore billingItem 9In the invention, an oiltight leak in the actual machine is claimed.Item 8Since it is detected by the described method, it is possible to detect and evaluate oil-tight leaks in accordance with the actual usage state of the injector.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described based on specific examples. In FIG. 1, an injector 1 is attached to a container 2. The injector 1 is a fuel injection valve conventionally known as a device for directly injecting fuel into a cylinder of a gasoline engine or diesel engine, for example, and is arranged with its injection port 3 facing the inside of the container 2. Has been.
[0024]
The injector 1 applies a pressure of fuel supplied under pressure to a valve opening side and a valve closing side, and a solenoid (not shown) so that the pressure difference is switched between the valve opening side and the valve closing side. ) Is driven to control the injection timing and the fuel injection amount. An injector drive circuit 4 for driving the solenoid is provided.
[0025]
The configuration of the fuel supply system that pressurizes the fuel and supplies 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 that temporarily stores (accumulates) pressurized fuel and distributes the pressurized fuel to the plurality of injectors 1.
[0026]
A fuel pump 8 that pumps up the fuel 7 from the fuel tank 6 and pressurizes it 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 supplied to the fuel tank 6. It comes to return. A pressure gauge 10 is connected between the delivery pipe 5 and the pressure regulator 9.
[0027]
The configuration 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 figure, a rectangular parallelepiped space is formed inside. An inlet 11 through which dilution gas flows and an outlet 12 through which dilution gas flows out are formed on two side walls adjacent to the outer wall (the upper wall in FIGS. 1 and 2) to which the injector 1 is attached. Yes. Moreover, two places of the outer wall part (bottom wall part in FIG. 1 and FIG. 2) facing the injection port 3 of the injector 1 have a transparent structure. This is a structure for visualizing the injection port 3 and its periphery from the outside, and a quartz glass 13 is fitted therein as an example.
[0028]
A camera 14 for photographing the inside of the container 2, particularly the injection port 3 and its periphery, is disposed outside the quartz glass 13 at a position facing the injection port 3. In addition, a spotlight 15 for irradiating light to the injection port 3 and its periphery is disposed outside the other quartz glass 13.
[0029]
In addition, since the fuel injected from the injector 1 is sprayed on the inner surface of the quartz glass 13, the inlet 11 is directed to spray the dilution gas toward the inner surface of the quartz glass 13 in order to promote the evaporation. Preferably formed.
[0030]
The dilution gas is, for example, clean air, and the flow rate of the dilution gas is controlled by a pipe line 16 that communicates a dilution gas source (not shown) such as an air pump or a cylinder with the inlet 11. A mass flow controller 17 is interposed. Further, a bypass valve 18 is connected between the mass flow controller 17 and the inlet 11 in the pipe line 16, and a flow meter 19 is connected to the bypass valve 18. That is, by discharging a part of the dilution gas sent from the mass flow controller 17 through the bypass valve 18 and the flow meter 19, a predetermined amount of the dilution gas can be obtained without reducing the pressure inside the container 2. It supplies to the inside of the container 2.
[0031]
A purge switching valve 20 is selectively connected to the outlet 12 of the container 2 so that the air inside the container 2 flows selectively and directly to the outside. This 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 at one of two ports other than the port communicating with the outlet 12. It is connected. Further, an analyzer that measures the concentration of any component constituting the fuel and outputs a signal is connected to the outflow side of the mass flow meter 21. Specifically, a total hydrocarbon analyzer 22 and an alcohol (ethanol) analyzer 23 are connected.
[0032]
The mass flow meter 21, the total hydrocarbon analyzer 22, and the methanol analyzer 23 are connected to the data processing device 24 so that data communication is possible. The data processing device 24 is configured mainly by a microcomputer as an example, and the oil-tight leak of the injector 1 is calculated from the flow rate sent from the mass flow meter 21 and the concentrations sent from the analyzers 22 and 23. Amount M_FuelIt is configured to calculate (mg / min).
[0033]
The calculation is performed by, for example, the following equation (1).
M_Fuel= Q * (γ₁* (C₁-R * C₂) + Γ₂* C₂* 10^-6  ... (1)
Where Q is the dilution gas flow rate (liter / min), C₁ Is the total hydrocarbon analyzer indicated concentration (ppmC), C₂ Is ethanol analyzer indicated concentration (ppm), γ₁ Is the hydrocarbon density, γ₂ Is the ethanol density and r is the ethanol sensitivity coefficient of the total hydrocarbon analyzer.
[0034]
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. In the state where each device is connected as shown in FIG. That is, the pressure regulator 9 is released, and the fuel pump 8 is driven to pressurize and supply the test fuel.
[0035]
Next, as step 2, the part of the injector 1 is vented. Specifically, air is supplied from the inlet 11 to the inside of the container 2 in a state where the inside of the container 2 is directly communicated to the outside by the purge switching valve 20, and in this state, the test fuel is supplied from the injector 1 to the container 2. Inject into the inside of the.
[0036]
In order to remove the fuel injected into the container 2 in this way, 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 this state, air is circulated inside the container 2 for several minutes.
[0037]
After the purge in the container 2 is completed, the background in the container 2 is checked as step 4. The operations performed here are as follows. First, the analyzers 22 and 23 are calibrated, and then the hydrocarbon concentration and alcohol in the diluent gas that has passed into the container 2 in a state where the analyzers 22 and 23 are switched to the measurement mode. Measure the (ethanol) 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 communicate with each other, and the flow rate set by the mass flow controller 17 is set to be higher than the sampling flow rate of the analyzers 22 and 23. A part of the gas is discharged through the bypass valve 18. This is to suppress the decompression of the container 2.
[0038]
After the above preparatory operations are completed, as step 5, the pressure regulator 9 is set to the test pressure. As an example, it is set to 300 kPa. By doing so, the fuel at the test pressure is applied to the injector 1, and a predetermined amount of dilution gas is continuously supplied into the container 2. In this state, as step 6, measurement / calculation (1) of the oil-tight leak amount is performed. That is, the detection values of the analyzers 22 and 23 and the detection value of the mass flow meter 21 are taken into the data processing device 24 and the calculation according to the above-described equation (1) is performed. The oil-tight leak amount obtained in this way is an oil-tight leak amount in a state where the fuel pump 8 is driven to pressurize the fuel.
[0039]
Next, as step 7, with the fuel pump 8 stopped and the delivery pipe 5 accumulating, the oil-tight leak amount measurement / calculation (2) is executed as in the above case. Further, as step 8, the set pressure of the pressure regulator 9 is sequentially decreased, and the oil-tight leak amount measurement / calculation (3) under various fuel pressures is executed.
[0040]
Since the oil-tight leak amount obtained as described above is an oil-tight leak amount from moment to moment, according to the apparatus and method according to the present invention, the oil-tight leak amount can be continuously detected. As a result, the state of oil-tight leakage can be grasped more accurately. Compared with the prior art, in the past, the total amount of oil-tight leak amount in a predetermined time width was detected, and changes in the oil-tight leak amount within the time width cannot be known. In the apparatus and method according to the above, even if the oil-tight leak amount changes from moment to moment, the change can be accurately detected.
[0041]
Further, in the above-described apparatus, since the injection port 3 and its surroundings in the container 2 are visualized, the situation of the oil-tight leak can be visually grasped, and the detection of the oil-tight leak becomes more accurate. . In other words, the amount of information for countermeasures against oil-tight leaks is much richer.
[0042]
This invention can also be comprised so that the oil-tight leak detection / evaluation about the injector 1 of the state attached to the actual machine may be performed. An example of this will be described next. The example shown in FIG. 4 is an example in which an adapter attached to and detached from the cylinder head 30 is used, and the adapter is configured as a plate 31. That is, a plurality of the above-described injectors 1 are mounted on the cylinder head 30, a plane portion 32 for attaching an intake manifold or an exhaust manifold (each not shown) is formed, and an injection port 3 of the injector 1 faces. An opening 33 such as an intake port or an exhaust port communicating with the space portion is formed in the plane portion 32.
[0043]
The plate 31 is configured to be attached in close contact with the planar portion 32, and the inlet 34 and the outlet 35 are arranged in the number of openings 33 so as to communicate with the openings 33. Correspondingly, multiple pairs are formed. These inlets 34 communicate with the mass flow controller 17 and the bypass valve 18 shown in FIG. Moreover, the outflow port 35 is connected to each analyzer 22, 23 via the purge switching valve 20 and the mass flow meter 21 shown in FIG.
[0044]
Although not particularly illustrated, if a sleeve made of an oil-resistant synthetic resin is attached to the injection port 34 and a dilution gas injection pipe is mounted through the sleeve, the port of the cylinder head 30 is connected. The insertion length of the injection tube can be adjusted according to the depth. Further, the other opening of the cylinder head 30 in FIG. 4 is sealed to prevent leakage of dilution gas and fuel. Each injector 1 is communicated with a delivery pipe 5 (or a common rail) held by the cylinder head 30.
[0045]
The measurement / calculation of the oil-tight leak amount in the actual machine shown in FIG. 4 is 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 in a state where it is mounted on an actual machine. In this case, even if a temperature change occurs, the continuous oil-tight leak amount based on the temperature change can be detected, so that the accuracy of detecting the oil-tight leak amount is improved.
[0046]
FIG. 5 is a diagram showing the result of measuring the amount of oil-tight leakage by attaching two injectors 1 to the cylinder head 30. The fuel pump 8 is driven for 10 seconds and then accumulated in the delivery pipe 5. The result when left unattended is shown. In the example shown in FIG. 5, in the injector A, an oil-tight leak of about 0.3 mg / min occurs when the fuel pump 8 is not driven, and after the fuel pump 8 is stopped after being driven, the amount of the oil-tight leak is Increased rapidly to about 0.7 mg / min, and then the oil-tight leak amount gradually decreased. On the other hand, in the injector B, no oil-tight leak occurred when the fuel pump 8 was not driven. However, after the fuel pump 8 was stopped after being driven, a slight oil-tightness of about 0.05 mg / min. A leak occurred.
[0047]
As described above, in the apparatus according to the present invention, the amount of oil-tight leak in the actual machine can be detected from moment to moment, the accuracy of detecting the oil-tight leak is improved, and the oil-tight leak state is accurately grasped.
[0048]
As each of the analyzers 22 and 23, an analyzer capable of setting a measurement range in a plurality of stages is known. When this type of analyzer is used, the amount of oil-tight leakage increases and the amount in the dilution gas is increased. Even when the concentration is high, the measurement accuracy of each analyzer can be maintained. However, if the concentration increases beyond the upper limit measurement range, the measurement accuracy decreases or the concentration cannot be measured. Therefore, in preparation for such a situation, a configuration as shown in FIG. it can.
[0049]
In the example shown in FIG. 6, when the total hydrocarbon concentration or alcohol (ethanol) concentration increases to a predetermined value or more, the mass flow controller 17 is controlled to increase the flow rate of the dilution gas, and each analyzer 22 is adjusted accordingly. , 23 is an example in which a bypass path is provided for maintaining the amount of the dilution gas flowing in the same manner as before. More specifically, the mass flow controller 17 is configured so that the flow rate setting value is controlled by the data processing device 24. The mass flow controller 17 and the container 2 are in direct communication with each other, and the bypass shown in FIG. The valve 18 or the like is not provided.
[0050]
A check valve 25 is bypassed and connected between the mass flow meter 21 and the analyzers 22 and 23, and a flow meter 26 is connected downstream of the check valve 25. A dilution gas of a specified amount or more for each analyzer 22, 23 is discharged to a predetermined location via the check valve 25 and the flow meter 26.
[0051]
Therefore, in the configuration shown in FIG. 6, even if the amount of oil-tight leak increases, measurement is performed while suppressing the concentration within the measurement range of each analyzer 22, 23, so the accuracy of measuring the amount of oil-tight leak is increased. The accuracy can be maintained. The configuration for changing the dilution rate shown in FIG. 6 can also be applied to the evaluation test using the actual machine shown in FIG.
[0052]
Here, the relationship between each of the above specific examples and the present invention will be briefly described. The so-called upstream configuration such as the mass flow controller 17 and the bypass valve 18 for supplying a dilution gas such as air to the container 2 or the cylinder head 30 is provided. Corresponds to the dilution gas supply device of the present invention, and either the total hydrocarbon analyzer 22 or the alcohol analyzer 23 or both correspond to the analyzer of the present invention. Further, the configuration in which the flow rate set value of the mass flow controller 17 is increased 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 or the like maintains the dilution gas amount of the present invention. Corresponds to means.
[0053]
The present invention is not limited to the specific examples described above. In addition to measuring the oil-tight leak amount by changing the pressurized state of the fuel described above, the ambient temperature is sequentially changed to change the temperature. It is good also as measuring the oil-tight leak amount for every. Moreover, it is good also as measuring by only a total hydrocarbon analyzer, without using an alcohol analyzer.
[0054]
【The invention's effect】
  As explained above, the claims1 to 4According to the invention, a predetermined component in the fuel is mixed in the dilution gas circulated inside the container facing the injection port of the non-operating injector, depending on the state of oil-tight leakage, and the concentration thereof is Since it is measured by the analyzer, the change in the oil leak rate corresponds to the concentration measured by the analyzer., Oil by data processing equipmentThe injector can be accurately evaluated by continuously grasping the state or amount of the tight leak.
[0055]
  Also billedItem 5According to the invention, when an oil-tight leak occurs in the injector, in addition to the leaked fuel being carried away by the dilution gas, at least a part of the container has a transparent structure. As a result, the injector can be accurately evaluated by more accurately grasping the oil-tight leak.
[0056]
  In addition, billingItem 6According to the invention, when the adapter is attached to the actual machine, the space where the injection port of the injector faces in the actual machine is closed, and in that state, a known amount of dilution gas is fed into the space from the dilution gas feeder, The dilution gas flows out from the outlet to the analyzer, and the fuel component in the dilution gas is measured by the analyzer.Measure the oil leaks continuously with the data processorThus, it is possible to accurately detect an oil-tight leak in an actual machine.
[0057]
  Still further, billingItem 7According to the invention, there is no claim 16In addition to the same effects as any of the inventions, if the amount of oil-tight leak increases and the concentration in the analyzer increases accordingly, the amount of dilution gas is increased, which exceeds the measurement range of the analyzer. As the concentration is avoided and the dilution gas supply is increased, the amount of dilution gas supplied to the analyzer is maintained in the previous state. It is possible to avoid such a situation that an amount of dilution gas is supplied or an abnormality occurs in the concentration measurement.
[0058]
  Meanwhile, billingItem 8According to the invention, predetermined components in the fuel are mixed with the dilution gas circulated through the space where the injection port of the non-operating injector faces, depending on the state of oil-tight leakage, and the concentration 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.
[0059]
  And billingItem 9According to the invention, an oil tight leak in an actual machine is claimed.Item 8Since it is detected by the described method, it is possible to detect and evaluate oil-tight leaks in accordance with the actual usage state of the injector.
[Brief description of the 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.
FIG. 3 is a flowchart 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.
FIG. 5 is a diagram showing the results of measuring the amount of oil-tight leakage using the adapter shown in FIG.
FIG. 6 is a system diagram schematically showing another example of an apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION 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 ... All Hydrocarbon analyzer, 23 ... Alcohol (ethanol) analyzer, 25 ... Check valve, 30 ... Cylinder head, 31 ... Plate, 34 ... Inlet, 35 ... Outlet.

Claims (9)

In an oil tight leak evaluation device for an injector that detects fuel leakage from a non-operating injector,
A container facing the injection port of the injector;
A dilution gas supply for circulating the dilution gas through the container;
An analyzer for continuously measuring the concentration of a predetermined component constituting the fuel in the dilution gas ;
A data processing device for calculating an oil-tight leak amount of the injector from the flow rate of the dilution gas and the concentration of a predetermined component constituting the fuel in the dilution gas;
Oil-tight leakage evaluating device of the injector, characterized in that it comprises a. 2. The injector for oil-tight leak evaluation of an injector according to claim 1, wherein the predetermined component constituting the fuel is a hydrocarbon or an alcohol . Oil-tight leakage evaluating apparatus Lee Njekuta according to claim 1 or 2, characterized in that the fuel pressurizing further comprises a fuel supply system for supplying to the injector. The data processing device sequentially reduces the fuel pressure when the fuel supply system is driven, when the fuel pressure is accumulated when the fuel supply system is stopped, and when the fuel set pressure is reduced. oil-tight leakage evaluating apparatus Lee Njekuta according to claim 3, characterized in that it is configured to continuously calculates the amount of leakage.   5. The oil tight leak evaluation apparatus 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.   In an oil-tight leak evaluation apparatus for an injector that detects leakage of fuel from a non-operating injector into an actual machine equipped with the injector,
  An adapter for closing the space in the actual machine facing the injection port of the injector;
  A dilution gas inlet and an outlet formed in the adapter so as to communicate with the space;
  A dilution gas supply for supplying a known amount of dilution gas connected to the dilution gas inlet;
  An analyzer communicating with the outlet and continuously measuring a concentration of a predetermined component constituting the fuel in the dilution gas sent out from the outlet;
  A data processing device for calculating an oil-tight leak amount of an injector from a dilution gas flow rate and a concentration of a predetermined component constituting the fuel in the dilution gas;
An oil-tight leak evaluation apparatus for an injector characterized by comprising: Dilution gas increasing means for increasing the amount of dilution gas when the concentration obtained by the analyzer increases above a predetermined level;
  Dilution gas amount maintaining means for maintaining the amount of dilution gas sent to the analyzer at an amount before the dilution gas increasing means increases the dilution gas amount;
The oil tight leak evaluation apparatus for an injector according to any one of claims 1 to 6, further comprising: In the oil-tight leak evaluation method for an injector that detects fuel leakage from a non-operating injector,
  The dilution gas is circulated through the space facing the injection port of the injector, and the concentration of a predetermined component constituting the fuel contained in the dilution gas is continuously measured, and the concentration and the dilution gas are measured. An oil-tight leak evaluation method for an injector, wherein the oil-tight leak amount of the injector is obtained based on the flow rate of the injector. 9. The method of claim 8, wherein the injector is mounted on a real machine, and the space portion is a space part in the real machine.

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