JPH09209869A - High pressure pump device and its testing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve fault that a part having no pressure resistant specification is damaged by high pressure when the oil tightness of a high pressure pipeline is inspected after assembled, by arranging a check valve between a passage through which fuel in the outside of the high pressure part of a high pressure pump is discharged to the outside of the high pressure pump and the outlet passage of high pressure regulating means. SOLUTION: When the oil tightness of a high pressure pipeline is inspected after a high pressure pump device 1 is assembled, firstly, a fuel pressure switching valve 15 is opened, a high pressure pipeline such as a fuel distributing piping 3 and a high pressure piping 5 are evacuated under vacuum, and air existing in the piping is extracted, and after that, testing liquid is filled into the high pressure pipeline from the intake side of a high pressure pump 11. Next, the high pressure pipeline is pressurized by pressure a little bit higher than a normal operating period from the outlet passage side of a high pressure regulator 14, and pressure lowering in a constant time is measured, then oil tightness inspection is carried out. At this time, a check valve 17 is interposed in the fuel discharge passage 19 of the high pressure pump 11, therefore, high pressure testing liquid is blocked by the check valve 17 and may not be led to flow into a high pressure pump 11 side, and a part having no pressure resistant specification is prevented from being damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure pump device for boosting the pressure of fuel, and particularly to a high-pressure pump device suitable for use in, for example, a fuel supply device for directly injecting gasoline into a cylinder of an internal combustion engine and the like. It relates to the test method.

[0002]

2. Description of the Related Art Conventionally, there has been a fuel supply device for boosting the fuel from a fuel tank to a predetermined pressure by a low pressure pump, further boosting the pressure by a high pressure pump, and pumping the fuel into a fuel injection valve through a fuel distribution pipe or the like. Proposed (for example, Japanese Patent Laid-Open No. 4-191)
461). In such an apparatus, a high-pressure regulator that adjusts the flow rate by opening and closing a valve is further provided on the downstream side of the fuel distribution pipe, and when the fuel pressure in the fuel distribution pipe exceeds a predetermined high pressure, excess fuel is removed by the high-pressure regulator. It is returned to the inside of the fuel tank to maintain a constant high pressure.

[0003]

By the way, when the above-described high-pressure pump and high-pressure regulator are used, for example, when applied to a fuel supply device for an engine, the passage of the fuel pipe is opened at the time of starting the engine and during normal operation. It is conceivable to construct a high-pressure pump device by providing a fuel pressure switching valve that opens and closes. In this high-pressure pump device, the suction side of the high-pressure pump is connected to the low-pressure pump in the fuel tank via the low-pressure pipe, the discharge side is connected to the fuel distribution pipe provided with the fuel injection valve via the high-pressure pipe, and The distribution pipe is connected to the high-pressure regulator via another high-pressure pipe, and the fuel pressure switching valve is provided on the upstream and downstream side passages of the high-pressure regulator.

However, when the high-pressure pump of such a high-pressure pump device is a rotary cylinder type swash plate pump and a magnet coupling or an oil seal is used for the drive shaft seal of this pump, the high-pressure pump system is assembled and then the high pressure pump is assembled. An oil-tight inspection of the piping system is performed, but especially in a cylinder injection gasoline engine that directly injects fuel into the combustion chamber using a high-pressure pump, a trial run is performed after the engine is assembled. If there is a crack in the crack, there is a risk that high-pressure and highly flammable gasoline will be discharged from the crack during the test operation, so an oil tightness test is required. In order to perform this oil tightness inspection, it is necessary to apply high pressure from the suction side of the high pressure pump, and at this time high pressure is also applied to the magnetic coupling partition wall and oil seal, which are not pressure resistant specifications, and these parts are damaged. There was a problem to do.

The present invention has been made in order to solve such a problem, and can accurately perform an oil tightness inspection of a high pressure piping system after assembling without damaging a part which is not pressure resistant due to high pressure. An object is to provide a high-pressure pump device and a test method thereof.

[0006]

A high-pressure pump device according to the invention of claim 1 is connected to a high-pressure pump for sucking and pressurizing fuel from the outside and a discharge side of the high-pressure pump via a fuel consuming portion. A high-pressure adjusting means for adjusting the pressure of the high-pressure fuel discharged from the high-pressure pump and a fuel pressure switch for opening and closing the high-pressure adjusting means according to the operation mode provided in a side path from an upstream side to a downstream side of the high-pressure adjusting means. A valve, a first check valve provided between the high pressure pump and the fuel consuming portion, and a passage through which fuel outside the high pressure portion of the high pressure pump is discharged to the outside of the high pressure pump and an outlet passage of the high pressure adjusting means. And a second check valve provided.

The high-pressure pump device according to a second aspect of the invention is the high-pressure pump device according to the first aspect of the invention, in which the fuel pressure switching valve is opened and high pressure is applied to the outlet passage of the high-pressure adjusting means to reach from the high-pressure pump to the high-pressure adjusting means. It is designed to inspect the pipe for fuel leaks.

Further, in the high-pressure pump device according to the invention of claim 3, in the invention of claim 1 or 2, the fuel pressure switching valve is constituted by a solenoid valve, and the solenoid of the solenoid valve is opened for a predetermined time. After that, a voltage lower than the applied voltage at the beginning of opening the solenoid valve is applied and held.

According to a fourth aspect of the present invention, there is provided a high pressure pump device testing method, wherein a high pressure pump for sucking and pressurizing a fuel from the outside is connected to a discharge side of the high pressure pump via a fuel consuming portion. A high-pressure adjusting means for adjusting the pressure of the high-pressure fuel discharged from the high-pressure pump, and a branch passage branched from the upstream passage of the high-pressure adjusting means, and a fuel pressure switching valve for opening and closing the branch passage in accordance with the operation mode. , A first outlet passage provided on the downstream side of the fuel pressure switching valve and a check valve provided between the high pressure pump and the fuel consuming portion, and the fuel pressure switching valve is opened to supply high pressure to the first outlet passage. The fuel is leaked from the high-pressure pump to the high-pressure adjusting means by inspecting for fuel leakage.

A high pressure pump device testing method according to a fifth aspect of the present invention is the method of the fourth aspect, wherein a downstream passage of the high pressure adjusting means is connected to the first outlet passage.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Embodiment 1. FIG. 1 is a configuration diagram showing Embodiment 1 of the present invention. In the figure, the high-pressure pump device 1 has a high-pressure pump 11, and this high-pressure pump 11 is connected to a camshaft of an engine (not shown) and driven by this. The suction side of the high pressure pump 11 is connected to a low pressure pump in the fuel tank via a low pressure pipe (not shown),
It is connected to a low pressure regulator that adjusts the flow rate of fuel flowing through the low pressure pipe by opening and closing the valve. The discharge side of the high-pressure pump 11 is connected to the upstream side of the fuel distribution pipe 3 via a check valve 12 as a first check valve and the high-pressure pipe 2. A fuel injection valve 4 is provided in the fuel distribution pipe 3. The fuel distribution pipe 3 and the fuel injection valve 4 are substantially fuel consuming parts.
A bypass valve 13 is connected between the suction side of the high-pressure pump 11 and the downstream side of the check valve 12.

Inside the high-pressure pump device 1, there is provided a high-pressure regulator 14 as a high-pressure adjusting means for adjusting the flow rate by opening and closing a valve, and the upstream side of the high-pressure regulator 14 is provided with a fuel distribution pipe 3 via a high-pressure pipe 5. The downstream side of the high-pressure regulator 14 is connected to a fuel tank (not shown) via a return pipe 18 as an outlet passage. Further, a fuel pressure switching valve 15 is provided in a side path from the upstream side to the downstream side of the high pressure regulator 14, the upstream side thereof is connected to the upstream side of the high pressure regulator 14, and the downstream side thereof is connected to the high pressure regulator 14 via an orifice 16. Downstream side (outlet passage), that is, the return pipe 18.

This fuel pressure switching valve 15 has its solenoid 1
By controlling the voltage applied to 5a, the valve is opened when the engine is started (a state opposite to that shown in the drawing), and is closed (a state shown in the drawing) during normal engine operation. It should be noted that the fuel pressure switching valve 15 is in an open state when the engine is started, and allows fuel to pass in the direction of the arrow pointing to the right in the figure. Further, as will be described later, in the case of an oil tight inspection of the high pressure piping system. Also, the valve is opened, and the test solution is passed in the directions of both arrows shown in the figure. That is,
The fuel pressure switching valve 15 in this case is bidirectional. Further, between the fuel discharge passage 19 for discharging the fuel from the drain chamber (not shown) where the fuel leaked from the high pressure portion (not shown) in the high pressure pump 11 is collected to the outlet passage of the high pressure regulator 14, that is, the return pipe 18. A check valve 17 is provided as the second check valve. The check valve 17 is for preventing high pressure from being applied to the high pressure pump 11 side in the oil tightness inspection described later.

Next, the operation will be described. When the engine is started, the fuel pressure switching valve 15 is switched from the illustrated state to an open state by applying a voltage of, for example, 12 V to the solenoid 15a, and the fuel in the fuel tank is boosted to a predetermined pressure by the low pressure pump, and the low pressure is applied. The high pressure pipe 2, the fuel distribution pipe 3, the high pressure pipe 5, the fuel pressure switching valve 15 and the orifice 16 are passed through the bypass valve 13 via the pipe. Then, the flow rate (pressure) of this fuel at this orifice 16
Is regulated, and the pressure in the path to the orifice 16 is regulated to a constant pressure, for example, 3 atm by the action of a low-pressure regulator (not shown), and thereafter, through the return pipe 18 at the same atmospheric pressure as the normal atmospheric pressure. It flows into the fuel tank. As a result, the steam filled in each fuel pipe is returned to the fuel tank.

On the other hand, during normal engine operation, the fuel pressure switching valve 15 is switched to the illustrated state by shutting off the applied voltage and closed, and the fuel in the fuel tank is boosted to a predetermined pressure by the low pressure pump. It is supplied to the suction side of the high-pressure pump 11 via the low-pressure pipe. Also in this case, the low pressure side is regulated to 3 atmospheres by the action of the low pressure regulator. The high-pressure pump 11 raises the pressure of the sucked fuel to a predetermined pressure, for example, 50 atmospheric pressure, and discharges it to the discharge side. The fuel discharged to the discharge side passes through the check valve 12, and is further supplied to the fuel injection valve 4 through the high pressure pipe 2 and the fuel distribution pipe 3. Then, the remaining difference in the flow rate consumed by the fuel injection valve 4 is returned from the fuel distribution pipe 3 to the fuel tank through the high-pressure pipe 5 and the high-pressure regulator 14 and the return pipe 18.

In the high-pressure pump apparatus 1 as described above, when the oil-tightness inspection of the high-pressure piping system is performed after the assembling, first, the valve of the fuel pressure switching valve 15 is opened and the high-pressure piping 2 and the fuel distribution piping are opened. 3 and the high-pressure piping system such as the high-pressure piping 5 are evacuated to remove air existing in the piping,
Then, the test liquid is filled from the suction side of the high-pressure pump 11. Then, from the outlet passage side of the high-pressure regulator 14, a separately prepared high-pressure pump device (not shown) is used to pressurize at a high pressure during normal operation, that is, a pressure slightly higher than 50 atm in this case, for example, a pressure of 60 atm, for a certain period of time. Measure the drop in pressure at and check the oil tightness. That is, the connection between the high-pressure pipe 2 and the high-pressure pump device 1, the connection between the high-pressure pipe 2 and the fuel distribution pipe 3, the connection between the fuel distribution pipe 3 and each fuel injection valve 4, the fuel distribution pipe 3 and the high-pressure pipe. 5, the connection between the high-pressure pipe 5 and the high-pressure pump device 1, and the like, as shown by the arrow a, the high-pressure pipe 2, the fuel distribution pipe 3, each fuel injection valve 4, the high-pressure pipe 5 itself Check for leaks.

At this time, since the check valve 17 is interposed in the fuel discharge passage 19 of the high pressure pump 11, the test liquid pressurized to 60 atm is blocked by the check valve 17 and flows to the high pressure pump 11 side. Therefore, the high pressure of 60 atm does not damage a portion of the high pressure pump 11 which is not pressure resistant. Further, during the oil tightness inspection, the fuel pressure switching valve 15 is opened, so that pressure is applied to both the upstream side and the downstream side of the high-pressure regulator 14, and there is substantially no pressure difference between the two. Therefore, the oil tightness inspection can be performed without being affected by the leakage of the high pressure regulator 14.

In the oil tightness inspection, when the fuel pressure switching valve 15 is once closed and the high pressure pump device 1 is pressurized for the oil tightness inspection, the solenoid 15a of the fuel pressure switching valve 15 is It has been found that when a rated voltage of 12 V is applied, the heat generated by the solenoid causes the gasoline or the leak test liquid having a viscosity equivalent to that of the gasoline to expand, resulting in a decrease in inspection accuracy. Therefore, as shown in FIG. 2, as the voltage required to overcome the spring force and sliding resistance of the return spring of the fuel pressure switching valve 15, a slightly higher voltage of, for example, 6 V is applied only while the valve is open until time t _1. Then, during the time t _{1 to} t ₂ at which the oil tightness inspection is actually performed, a voltage lower than that at the time of opening the valve, for example, 3 V is applied to the fuel pressure switching valve 15
Keep the valve open state. As a matter of course, the method of applying the two-stage voltage to the solenoid 15a of the fuel pressure switching valve 15 may be used when the fuel pressure switching valve 15 is opened when the high pressure piping system is evacuated. The oil-tightness inspection may be performed while the open state of the fuel pressure switching valve 15 is maintained at a voltage lower than the valve opening pressure at the time of. Thus, during the oil tightness inspection, the fuel pressure switching valve 15 is over-excited with a high voltage of 6V only when the valve is opened, and the valve is kept open at a low voltage of 3V during the oil tightness inspection. The influence of the heat generation of the solenoid 15a of the fuel pressure switching valve 15 on the oil tightness inspection can be minimized.

As described above, in this embodiment, since the check valve is provided in the fuel discharge passage from the drain chamber of the high-pressure pump, when the oil-tightness inspection of the high-pressure piping system is performed after the high-pressure piping system is assembled. The high pressure applied from the outlet passage of the high pressure regulator does not damage parts that are not pressure resistant, such as parts inside the high pressure pump. Further, the fuel pressure switching valve is substantially bidirectional, and this fuel pressure switching valve is opened during the oil tightness inspection so that there is substantially no pressure difference between the upstream side and the downstream side of the high pressure regulator. Because
Oil tightness inspection can be performed accurately without being affected by leakage of the high pressure regulator.

Further, during the oil tightness inspection, the fuel pressure switching valve is over-excited with a high voltage only when the valve is opened, and during the original oil tightness inspection, the valve is kept open at a lower voltage than when the valve was opened. Therefore, the influence on the oil tightness inspection due to the heat generation of the solenoid of the fuel pressure switching valve can be minimized, and the oil tightness inspection can be performed with high accuracy.

Embodiment 2 FIG. In addition, the first embodiment described above.
Then, the test liquid was filled from the suction side of the high-pressure pump when the high-pressure piping system was evacuated, but it may be filled from the outlet passage side of the high-pressure regulator. Further, the values of the above-mentioned pressure and voltage applied during the oil tightness inspection are not limited to the above-mentioned values, and can be set to arbitrary values.

Embodiment 3 FIG. 3 is a configuration diagram showing a third embodiment of the present invention. In the figure, a high-pressure pump device 1 has a high-pressure pump 11, and this high-pressure pump 11 is driven by a camshaft of an engine (not shown).
The suction side of the high-pressure pump 11 is connected to the low-pressure pump in the fuel tank via a low-pressure pipe (not shown) as in the first embodiment, and a low-pressure regulator that adjusts the flow rate of fuel flowing through the low-pressure pipe by opening / closing a valve. Connected to. The discharge side of the high-pressure pump 11 is connected to the upstream side of the fuel distribution pipe 3, which is a fuel consuming portion, via the check valve 12 and the high-pressure pipe 2.

Further, the suction side of the high-pressure pump 11 and the check valve 1
Bypass valve 1 in bypass passage 20 that bypasses the downstream side of 2
3 is connected, a passage 23 branched from the bypass passage 20 on the upstream side of the bypass valve 13 is connected to a cooling chamber outside the high pressure portion of the high pressure pump 11, and the high pressure pump 11 is for cooling introduced into this cooling chamber. Since the fuel is sufficiently cooled by the fuel, the temperature rise of the fuel to the fuel injection valve 4 due to the heating of the high pressure pump 11 is suppressed, and the generation of vapor is prevented. The cooling chamber also serves as a drain chamber in which the fuel leaked from a high pressure portion (not shown) in the high pressure pump 11 is collected. The downstream side of the cooling chamber communicates with the inside of a fuel tank (not shown) through a fuel discharge passage 19 that discharges fuel outside the cooling chamber.

Inside the high pressure pump device 1, a high pressure regulator 14 and a fuel pressure switching valve 15 similar to those of the first embodiment are provided.
Is provided, and its upstream side is connected to the downstream side of the fuel distribution pipe 3 via the high-pressure pipe 5 as in the first embodiment. The downstream side of the fuel pressure switching valve 15 communicates with the inside of the fuel tank through the orifice 16 and the first return pipe 21 as the first outlet passage. Further, the downstream side of the high pressure regulator 14 communicates with the inside of the fuel tank via a second return pipe 22 as a downstream passage.

Next, in the high pressure pump device 1, an oil tightness inspection after assembling the high pressure piping system will be described. First, the fuel pressure switching valve 15 is opened to open the high pressure pipe 2,
The high-pressure pipe system such as the fuel distribution pipe 3 and the high-pressure pipe 5 is evacuated to remove air existing in the pipe, and then the test liquid is filled from the suction side of the high-pressure pump 11. Then, the second return pipe 22 is closed and a high pressure pump device (not shown) separately prepared from the first return pipe 21 side provided on the downstream side of the fuel pressure switching valve 15 provides a high pressure during normal operation, that is, 50 in this case. A pressure slightly higher than atmospheric pressure, for example, a pressure of 60 atmospheric pressure is applied, and an oil tightness test similar to that of the first embodiment is performed.

At this time, since the check valve 12 is provided on the discharge side of the high pressure pump 11, the test liquid pressurized to 60 atm is blocked by the check valve 12 and does not flow to the high pressure pump 11 side.
Therefore, the 60 atmospheric pressure does not damage a portion of the high-pressure pump 11 which is not pressure resistant. Further, the oil tightness inspection can be performed without disassembling the high pressure pump device 1, the fuel distribution pipe 3 and the fuel injection valve 4 assembled to pressurize the test liquid from the first return pipe 21 side. Further, during the oil tightness inspection, the fuel pressure switching valve 15 is overexcited with a high voltage of 6V only when the valve is opened, and the valve is kept open at a low voltage of 3V during the original oil tightness inspection. The influence of the heat generation of the solenoid 15a of the fuel pressure switching valve 15 on the oil tightness inspection can be minimized.

As described above, in the present embodiment, the check valve is interposed on the discharge side of the high-pressure pump, and the test liquid is pressurized from the first return pipe, so that the portion of the high-pressure pump which is not pressure-resistant is damaged. Disappears. Further, the oil tightness inspection can be performed without disassembling the assembled high pressure pump device and the like. Further, during the oil tightness inspection, the fuel pressure switching valve is over-excited with a high voltage only when the valve is opened, and during the original oil tightness inspection, the valve is kept open at a lower voltage than when the valve was opened. The influence of the heat generation of the solenoid of the fuel pressure switching valve on the oil tightness inspection can be minimized, and the oil tightness inspection can be performed with high accuracy.

Fourth Embodiment 4 is a configuration diagram showing a fourth embodiment of the present invention. In the fourth embodiment, the first downstream side of the fuel pressure switching valve 15 as in the third embodiment.
The return pipe 21 and the second return pipe 22 as the downstream passage of the high-pressure regulator 14 do not have different outlets, and
The second return pipe 22 is connected to the return pipe 21. At this time, since the check valve 12 is provided on the discharge side of the high-pressure pump 11, the test liquid pressurized to 60 atmospheric pressure is blocked by the check valve 12 and does not flow to the high-pressure pump 11 side. The atmospheric pressure does not damage a portion of the high-pressure pump 11 which is not pressure-resistant. Further, the oil tightness inspection can be performed without disassembling the high pressure pump device 1, the fuel distribution pipe 3 and the fuel injection valve 4 assembled to pressurize the test liquid from the second return pipe 22 side.

In the oil tightness inspection, the fuel pressure switching valve 15
Is opened, pressure is applied to both the upstream side and the downstream side of the high-pressure regulator 14 so that there is substantially no pressure difference between the two.
The oil tightness inspection can be performed without being affected by the leakage of item 4. Furthermore, by reducing the number of outlet passages as compared with the third embodiment described above, it becomes possible to simplify the arrangement of the fuel pipes near the high-pressure pump device 1 when the vehicle is mounted, and reduce the number of parts, etc. Can be achieved.

As described above, in this embodiment, in addition to the effects of the third embodiment, the fuel pressure switching valve is substantially bidirectional, and the fuel pressure switching valve is opened during the oil tightness inspection. Since there is substantially no pressure difference between the upstream side and the downstream side of the high pressure regulator, the oil tightness inspection can be performed accurately without being affected by the leakage of the high pressure regulator.

The high-pressure pump device and test method according to the present embodiment are most preferably used in a cylinder injection gasoline engine using a highly flammable fuel such as gasoline as described above. It may also be used in diesel engines that use light oil, which is relatively inflammable, but in this case, oil-tightness inspection is not always necessary because the flammability is low even if the test run is performed without performing oil-tightness inspection. .

[0032]

According to the first aspect of the present invention, a high-pressure pump that sucks and pressurizes fuel from the outside, and a discharge side of this high-pressure pump are connected through a fuel consuming portion and discharged from the high-pressure pump. High pressure adjusting means for adjusting the pressure of the high pressure fuel,
A fuel pressure switching valve that is provided in a side passage from the upstream side to the downstream side of the high pressure adjusting means and opens and closes the side passage according to an operation mode, and a first reverse valve provided between the high pressure pump and the fuel consuming portion. Since the stop valve and the second check valve provided between the passage through which the fuel outside the high pressure portion of the high pressure pump is discharged to the outside of the high pressure pump and the outlet passage of the high pressure adjusting means are provided, the high pressure piping system is provided. During the oil tightness inspection of this high pressure piping system after assembly, the high pressure applied from the outlet passage of the high pressure adjusting means will not damage parts that are not pressure resistant, such as parts inside the high pressure pump, and also adjust the high pressure. There is an effect that the oil tightness inspection can be performed accurately without being affected by the leakage of the means.

[0033] According to the invention of claim 2, according to claim 1 of the present invention.
In the invention, the fuel pressure switching valve is opened, and high pressure is applied to the outlet passage of the high pressure adjusting means to inspect the fuel leak in the pipe from the high pressure pump to the high pressure adjusting means. There is an effect that the oil tightness inspection can be performed more accurately without receiving it.

According to the invention of claim 3, claim 1
In the invention of 2 or 2, the fuel pressure switching valve is constituted by a solenoid valve, and a voltage lower than the applied voltage at the beginning of opening of the solenoid valve is applied to the solenoid of the solenoid valve for a predetermined time after the solenoid valve is opened to hold the solenoid valve. Therefore, the influence of heat generation of the solenoid of the fuel pressure switching valve on the oil tightness inspection can be minimized, and the oil tightness inspection can be performed with high accuracy.

Further, according to the invention of claim 4, a high-pressure pump for sucking and pressurizing the fuel from the outside and a discharge side of the high-pressure pump are connected through a fuel consuming portion and discharged from the high-pressure pump. A high-pressure adjusting means for adjusting the pressure of the high-pressure fuel, a branch passage branched from an upstream passage of the high-pressure adjusting means, and a fuel pressure switching valve for opening and closing the branch passage according to the operation mode, and a fuel pressure switching valve A first outlet passage provided on the downstream side and a check valve provided between the high pressure pump and the fuel consuming portion are provided, the fuel pressure switching valve is opened, and high pressure is applied to the first outlet passage so that the high pressure pump Since the fuel leak in the pipe leading to the high-pressure adjusting means is inspected, the check valve is interposed on the discharge side of the high-pressure pump, and the test liquid is pressurized from the first outlet passage so that the high-pressure pump does not have pressure resistance specifications. Can be damaged It is eliminated, and there is an effect that it is possible to perform the oil-tight inspection without disassembling the assembled high-pressure pump device or the like.

According to the invention of claim 5, claim 4
In the invention described above, since the downstream passage of the high pressure adjusting means is connected to the first outlet passage, there is an effect that the oil tightness inspection can be performed more accurately without being affected by the leakage of the high pressure adjusting means. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the first embodiment of the present invention;

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

1 high-pressure pump device, 11 high-pressure pump, 12, 17
Check valve, 14 high pressure regulator, 15 fuel pressure switching valve,
2,5 high pressure piping, 3 fuel distribution piping, 4 fuel injection valve,
18 return pipe, 19 fuel discharge passage, 21 first return pipe, 22 second return pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Shimo 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Kiyoshige Shimaoka 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Automobile Industry Co., Ltd. (72) Inventor Ukonman Aho Mauri 5-3-8, Shiba, Minato-ku, Tokyo Mitsubishi Motors Corp. (72) Inventor Asahide Maruyama 5-33-8, Shiba, Minato-ku, Tokyo No. Mitsubishi Motors Corporation

Claims (5)

[Claims] 1. A high-pressure pump that sucks in and pressurizes fuel from the outside, and is connected to the discharge side of the high-pressure pump through a fuel consuming portion,
High-pressure adjusting means for adjusting the pressure of the high-pressure fuel discharged from the high-pressure pump, and fuel pressure switching for opening and closing the high-pressure adjusting means according to the operation mode provided on a side path from the upstream side to the downstream side of the high-pressure adjusting means. A valve, a first provided between the high pressure pump and the fuel consuming portion
And a second check valve provided between the passage through which the fuel outside the high pressure portion of the high pressure pump is discharged to the outside of the high pressure pump and the outlet passage of the high pressure adjusting means. Characteristic high pressure pump device. 2. The fuel pressure switching valve is opened, and high pressure is applied to an outlet passage of the high pressure adjusting means to inspect a fuel leak in a pipe from the high pressure pump to the high pressure adjusting means. The high-pressure pump device according to claim 1. 3. The fuel pressure switching valve is composed of a solenoid valve, and a voltage lower than the applied voltage at the beginning of opening of the solenoid valve is applied to and held by a solenoid of the solenoid valve after a predetermined time has elapsed since the solenoid valve was opened. The high pressure pump device according to claim 1 or 2, wherein 4. A high-pressure pump that sucks in and pressurizes fuel from the outside, and is connected to the discharge side of the high-pressure pump via a fuel consuming portion,
A high-pressure adjusting means for adjusting the pressure of the high-pressure fuel discharged from the high-pressure pump, and a branch passage branched from an upstream passage of the high-pressure adjusting means, the fuel pressure switching valve opening and closing the branch passage according to an operation mode. And a first outlet passage provided on the downstream side of the fuel pressure switching valve, and a check valve provided between the high-pressure pump and the fuel consuming portion. A test method for a high-pressure pump device, characterized in that a high pressure is applied to an outlet passage to inspect a fuel leak in a pipe from the high-pressure pump to the high-pressure adjusting means. 5. The method for testing a high-pressure pump device according to claim 4, wherein a downstream passage of the high-pressure adjusting means is connected to the first outlet passage.