JP3077775B2 - Injection rate meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection rate meter for measuring an injection rate of a diesel engine or the like, and more particularly, to Zeuch.
The present invention relates to an injection rate meter according to the above method.

[0002]

2. Description of the Related Art In recent diesel engines, it is a general tendency to increase the injection rate in order to improve combustion and exhaust performance. However, not only simply increasing the injection pressure, but also including the shape of the injection. Fine control is required. Therefore, it is necessary to measure the injection rate with high accuracy and high reliability.

[0003] Zeuch's method is a method of injecting fuel into a pressure vessel filled with fuel and measuring the injection rate by utilizing the fact that the pressure in the vessel increases in proportion to the injection amount. Now, the pressure increase Δp of the liquid when the fuel is injected into the pressure vessel having the volume V by ΔV is expressed by the following equation, where K is the bulk modulus of the liquid. Δp = K · (ΔV / V) (1) Assuming that the density of the fuel is ρ and the time is t, the fuel injection rate dm /
dt can be written as follows. dm / dt = ρ · (V / K) · (dp / dt) (2)

FIGS. 44 to 46 show an example of an injection rate meter using the conventional Zeuch's method.
FIG. 45 is a cross-sectional view showing a pressure vessel and a testing device, FIG. 45 is a block diagram showing a measuring device, and FIG. 46 is a diagram showing measurement timing. The pressure vessel 1 is a hermetically sealed vessel filled with fuel, and has an injection nozzle 2, a temperature sensor 3, a pressure detection sensor 4, a back pressure sensor 5, and the like attached to a side surface.

[0005] The injection nozzle 2 is supplied with fuel from an injection pump 15 driven by a motor 14. The angle signal of the axis of the injection pump 15 is input to the timing controller 16. The fuel supplied from the injection pump 15 is injected from the injection nozzle 2 into the pressure vessel 1, and after the injection nozzle 2 finishes the injection, the timing controller 16 controls the high-speed solenoid valve 6 via the valve driver 17. When driven, the fuel in the pressure vessel 1 is discharged by the relief valve 7 to an arbitrarily set pressure (back pressure).

The pressure detecting sensor 4 is a sensor for determining the injection rate, and is of a piezo type having little hysteresis and good linearity. The output of the pressure detection sensor 4 indicates a value proportional to the injection rate, and the output is connected to the signal processing unit 18. The signal processing unit 18
After the signal is amplified by the charge amplifier 20, it is differentiated by the differentiating circuit 20, and the value becomes an output (injection rate signal) proportional to the injection rate. The injection rate signal is output as a voltage signal after high-frequency noise is cut by a Bessel-type low-pass filter 22. FIG. 46 shows a timing chart at the time of measurement.

Since the bulk modulus of the fuel depends on the pressure and temperature, the absolute value of the back pressure at the time of measuring the injection rate is measured using the semiconductor type back pressure sensor 5, and at the same time, the temperature sensor 3 Use to measure the temperature. Back pressure sensor 5
And the outputs of the temperature sensor 3 are amplified by amplifiers 23 and 19 in the signal processing unit 18, respectively.

The verification device 8 comprises a verification piston 11 reciprocating by a cam 10 driven by a motor 9 and a linear gauge 12 for measuring the displacement of the verification piston 11.
And a rotary encoder 13 for generating a reference signal. The output of the testing device 8 is connected to the testing unit 24, and the displacement of the testing piston 11, that is, the volume elasticity coefficient is obtained from the relationship between the volume change and the pressure change.

[0009]

However, in the above-described conventional injection rate meter, when fuel is injected from the injection nozzle into the pressure vessel, a liquid column vibration occurs in the fuel filled in the pressure vessel, There is a problem in that the pressure rise due to the liquid column vibration is added to the pressure rise due to the original injection, and the measurement accuracy by the pressure detection sensor is deteriorated. Such vibrations are due to natural vibrations due to the shape of the container, and are difficult to remove by a filter.

In addition, there is a problem that the SN ratio of the detection signal is low because the mounting method and the mounting position of the pressure detecting sensor and the injection nozzle are inappropriate.

An object of the present invention is to solve the above-mentioned problems, reduce the influence of liquid column vibration in a pressure vessel, improve the S / N ratio of a detection signal, and measure injection rate with high accuracy. It is to provide.

[0012]

In order to solve the above-mentioned problems, an injection rate meter according to the present invention injects a liquid from an injection nozzle into a pressure vessel filled with the liquid, and in proportion to the injection amount. In an injection rate meter that detects an increasing pressure of the pressure vessel by a pressure detection sensor and measures an injection rate, the pressure detection sensor is provided at two positions of the pressure vessel.
Take the component of the sum of the detected values, the bottom surface of the pressure vessel is flat , one of the sensors for pressure detection,
It is characterized in that it is attached to the center of the bottom surface.

[0013]

On the other hand, the injection rate meter according to the present invention injects liquid from an injection nozzle into a pressure vessel filled with liquid,
In an injection rate meter that detects the pressure of the pressure container increasing in proportion to the injection amount by a pressure detection sensor and measures an injection rate, the pressure detection sensor is a thin plate attached to the inner wall of the pressure container. It is a ring-shaped piezoelectric element.

[0015]

[0016]

According to the present invention, the liquid column vibration (pressure wave) component in the pressure vessel can be reduced by taking the sum of the two pressure detection sensors as a signal. At this time,
The pressure detection sensor has a flat bottom
One of those pressure sensing sensors
Mounting at the center of the surface reduces the effects of liquid column vibration
It is possible.

Further, by detecting a pressure change by a ring-shaped piezoelectric element or the like attached to the inner wall of the pressure vessel, the liquid column vibration component can be reduced.

On the other hand, if the nozzle holder for holding the injection nozzle is made of a material having vibration damping properties, the injection nozzle does not become a vibration source. Also, if the injection nozzle is sealed at the tip, the degree of freedom at the tip of the nozzle is limited, and it does not become a vibration source,
The SN ratio can be increased.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings and the like. 1 is a diagram showing a first embodiment of an injection rate meter according to the present invention, FIG. 1 is a diagram showing a pressure vessel, FIG. 2 is a block diagram showing a signal processing unit of a pressure detection sensor, FIG. 3 is a circuit diagram showing the addition processing unit.
In addition, the part which performs the same function as the above-mentioned conventional example includes
The same reference numerals are given and duplicate description will be omitted.

In this embodiment, the pressure vessel 1 has a bottom plate Q that can be replaced.
To Q400. Bottom plate Q10
0 and Q200 have a truncated cone shape symmetrical to the inner wall on the upper side of the pressure vessel 1, and the bottom plates Q300 and Q400 have flat inner walls. This pressure vessel 1 has a pressure detection sensor 4
A, 4B, and 4C can be attached, and any two of them can be selected and used.

The pressure detecting sensors 4A and 4B are shown in FIG.
As shown in (B), a horizontal plane including the injection nozzle 2 is symmetrical with respect to an axis orthogonal to the central axis of the injection nozzle 2 and a predetermined angle θ (at a position of 30 ° in the example of FIG. 1). ). The pressure detection sensor 4C is arranged at the center of the bottom plate Q.

After the injection nozzle 2 is mounted on the holder 41, the injection nozzle 2 is fixed to the pressure vessel 1 by means of screws 43 using an attachment 42. The injection nozzle 2 is sealed at its tip with a packing 44. The holder 41
The packing 44 and the like will be described later in detail with reference to FIG. AP1 to AP4 are acceleration pickups, and in an experimental example described later, FIG.
(A) It is used for vibration measurement in the direction of the arrow shown.

As shown in FIG. 2, the pressure detecting sensor 4
The detection signals PCB1 and PCB2 from A and 4B are amplified by the charge amplifiers 20A and 20B, and then added to the adder 2B.
5, the combined signal (PCB1 + PCB2)
Is generated. FIG. 3 shows an example of the addition circuit 25.

Next, some improvements of the injection rate meter of the example of FIG. 1 will be described in more detail with reference to a reference example and an experimental example according to the embodiment . [Experimental Example 1 according to Reference Example ] It is considered that the liquid column vibration of the pressure vessel 1 includes a mode in which the phase is inverted with respect to the center, as shown in FIG. This injection rate meter has two pressure detecting sensors 4
By attaching the output signals A and 4B and combining the output signals (PCB1 + PCB2), it was examined whether or not the liquid column vibration is canceled out and whether such a mode exists.

(Experimental Method) Using an apparatus as shown in FIG.
FT analysis was performed. Further, based on the output signal (PCB1) of the pressure detection sensor 4A, the pressure detection sensor 4B
Of the output signal (PCB2) was measured.

(Experimental conditions) Pump rotation: 1000 rpm Back pressure: 30 kg / cm ² Rack: fully open LPF: 8 kHz

(Experimental Results) FIGS. 4 to 6 are diagrams showing measurement results of the injection rate meter according to the reference example . FIG. 4 shows the injection rate of the output signal PCB1, and FIG. 5 shows the injection rate of the PCB2. FIG. 6 shows a composite signal (PCB1 +
It is a diagram which shows each injection rate of PCB2). Although the measured injection rates show substantially the same shape, the shape and level of the high-frequency component noise after the end of the injection are very different depending on each condition. For example, it can be seen that the injection rate obtained from the composite signal shown in FIG. 6 is significantly lower than in FIGS.

FIGS. 7 to 9 show the injection rates of FIGS.
It is a diagram which shows the result of each T analysis. In addition, 10
The horizontal axis is used as a linear scale in order to see frequency components above kHz. 9 (PCB1 + PCB)
Comparing the frequency characteristics of 2) and those of the outputs (PCB1, PCB2) of FIGS. 7 and 8, the level of the composite signal is lower overall at 10 kHz or more. FIG. 10 is a diagram showing a result of a phase analysis performed with reference to PCB1. Table 1 shows the frequency of each mark and its phase difference.

[0029]

[Table 1]

FIG. 9 is compared with FIG. 7 and FIG.
In the range of 5 kHz and 27 kHz or more, the level drops considerably. Looking at the phase difference in this range in FIG. 10, the phase is shifted by about 160 ° to 180 ° (absolute value), and it is considered that the phases are offset. In addition, 15-27k
Looking at the range of Hz, the level of the synthesized signal is slightly reduced. In FIG. 10, when looking at this range, no extreme phase difference such as 10 to 15 kHz and 27 to 33 kHz is observed.

According to Experimental Example 1, it was found that the noise of the high frequency component can be reduced by synthesizing the signals of the two pressure detecting sensors. Here, the range where the level of the frequency component is greatly reduced is when the phase is 18
It is consistent with a range that is nearly 0 ° different. Therefore,
Output signals PCB of two pressure detection sensors 4A and 4B
1, PCB2 has a mode whose phase is inverted,
It can be seen that the signals can be canceled by adding them.

Next, in FIG. 10, the range where the phases are different by almost 180 °, 12 to 14 kHz and 25 to 35 kHz
Correspond to the frequency shown in Table 1. MAK13 / MAK1 = 29.125 / 12.5 = 2.33 MAK14 / MAK2 = 29.375 / 12.75 = 2.30 MAK15 / MAK3 = 30.875 / 13.125 = 2.35 MAK16 / MAK4 = 31 .25 / 13.25 = 2.36 MAK18 / MAK5 = 32.5 / 13.875 = 2.34 That is, since the frequency ratio takes a constant value of about 2.3, the pressure detection sensor It is determined that one mode has been canceled out by adding the output signals (PCB1 + PCB2).

Next, the optimal shape of the pressure vessel 1 of the injection rate meter according to the present embodiment and the optimal mounting position of the pressure detecting sensor 4 on the pressure vessel 1 will be described. The mounting position of the pressure vessel 1 shape as the pressure detection sensor 4 Experimental Example 2 according to the Embodiment], the waveform of the injection rate obtained, the noise level difference is generated. We have pursued the optimal conditions for reducing this noise level.

(Experimental Method) FIGS. 11 to 20 are views for explaining the mounting positions of the pressure vessel and the pressure detecting sensor of the injection rate meter according to the first embodiment. As the pressure vessel 1, the bottom plate Q200 (q
= 200 mm ³ / str equivalent volume (V = 100c
m ³ )) as the TYPE of the shape of the pressure vessel 1 and the mounting position of the pressure detecting sensor 4 as shown in FIG.
~ Prepare 10 kinds of things as shown in FIG.
A comparison was made between the injection rate waveforms shown in FIGS. 11 (B) and (C) to FIGS. 20 (B) and (C) and the noise level generated after the end of the injection. Here, TYPE0 corresponds to the embodiment of the injection rate meter shown in FIG. The pressure detection sensors 4A and 4C are both provided on the side of the pressure vessel 1 and the bottom plate Q.
Attached to.

Next, the characteristics of each type of pressure vessel will be briefly described. TYPE1 Height = 50.3 mm Diameter = 87.1 mm A (draw angle) = 120 ° W (weight) = 12.9 kg TYPE2 Height = 57.2 mm Diameter = 81.7 mm A (draw angle) = 110 ° W ( Weight) = 12.9 kg TYPE3 Height = 43.6 mm Diameter = 93.6 mm A (diaphragm angle) = 130 ° W (weight) = 13.4 kg TYPE4 Height = 72.6 mm Diameter = 72.6 mm A (diaphragm angle) ) = 90 ° W (weight) = 13.7 kg TYPE5 Height = 104.5 mm Diameter = 60.0 mm A (diaphragm angle) = 60 ° W (weight) = 15.1 kg TYPE6 (the shape of the bottom plate is different from TYPE1) Height = 16.8 mm Diameter = 87.1 mm A (drawing angle) = 120 ° W (weight) = 12.8 kg TYPE7 (the shape of the bottom plate differs from TYPE1) Height = 33.5 mm straight A = 87.1 mm A (diaphragm angle) = 120 ° W (weight) = 12.8 kg TYPE 8 (designed so that effective height and diameter are the same) Height = 69.6 mm Diameter = 50.3 mm A (diaphragm angle) = 120 ° W (weight) = 8.7 kg TYPE9 Height = 77.1 mm Diameter = 43.0 mm A (diaphragm angle) = 120 ° W (weight) = 8.5 kg TYPE0 Height = 58.0 mm Diameter = 60. 0 mm A (aperture angle) = 120 ° W (weight) = 8.2 kg

(Experimental conditions) Pump rotation speed: 1000 rpm Injection nozzle: 5 nozzle hole nozzle, Po = 20 MPa Injection amount: 53.6 mm3 / str Back pressure: 3 MPa LPF: 8 kHz

The waveform of the injection rate does not change due to the difference in the shape of the pressure vessel 1 and the mounting position of the pressure detecting sensor 4. When the pressure vessel 1 has a shape in which the cones of TYPE1 to TYPE5 are combined as shown in FIGS. 11 to 15, the noise level is not significantly reduced. Also, the throttle angle A in front of the pressure receiving surface of the sensor 4 for detecting pressure.
And the noise level, the pressure detection sensor 4
The output signals PCB1 and PCB3 of A and 4C are both A =
At 90 °, the noise level tends to be high when the aperture angle A is small, and the noise level tends to be low when the aperture angle is large.

On the other hand, in TYPE 7 (FIG. 17), the output signal PCB3 of the pressure detection sensor 4C is output, and in TYPE 8 (FIG. 18), the output signal PCB1 of the pressure detection sensor 4A is output.
However, in TYPE 9 (FIG. 19), the pressure detection sensor 4A
When the output signal PCB1 of TYPE0 (FIG. 20) was obtained, the output signal PCB3 of the pressure detection sensor 4C obtained a waveform with a good S / N injection rate. However, there is no container shape in which the S / N of the output signals PCB1 and PCB3 of the pressure detection sensors 4A and 4C are both good, and in order to improve the S / N, mutual examination of the container shape and the sensor mounting position is necessary. I understood that.

There are two patterns for the container shape with a clean injection rate waveform and the sensor mounting position. In one pattern, as in TYPEs 8 and 9, the pressure detection sensor is attached at substantially the center in the height direction. Another pattern is
Like TYPE7,0, the height of the pressure vessel 1 is reduced, and the pressure detection sensor 4C is attached to the center of the bottom plate.
At this time, it can be seen that the shape of the bottom plate Q of the pressure vessel 1 is preferably flat according to the results from TYPE1 to TYPE5.

Next, a method of attaching the injection nozzle 2 will be described. FIG. 21 is a view showing an injection nozzle of an injection rate meter according to a reference example and a mounting structure thereof. Injection nozzle 2
As shown in FIG. 21A, a general hole nozzle is used, and is composed of a large diameter portion 2a, a medium diameter portion 2b, a small diameter portion 2c, and a tip 2d. Here, the holder part 41 shown in FIG.
And the sleeve 41B are screwed together, and as shown in FIG. 21B, the injection nozzle 2 is inserted inside. As described with reference to FIG. 1, the nozzle holder 41A and the sleeve 41B are fixed to the pressure vessel 1 filled with the liquid by the screws 43 by the attachment. At this time,
A packing 44 is inserted into the tip 2 d of the injection nozzle 2. The nozzle holder 41A and the nozzle holder main body 41C are screwed together, and the nozzle holder main body 41C is screwed in so that the injection nozzle 2 is connected with the nozzle holder 41A and the nozzle holder main body 41C so as to be sandwiched therebetween. The reason why the nozzle holder 41A and the sleeve 41B are screw-coupled is that there is no standard in the shape of the injection nozzle 2 and the length of the portion A differs depending on the nozzle. This is to facilitate the management of the surface pressure when the injection nozzle is sealed in the portion (b).

When measuring the injection rate, the vibration of the tip 2d of the injection nozzle 2 greatly affects the S / N of the measurement result. As a countermeasure, the sealing method of the tip 2d of the injection noise 2, the material of the packing, and the like were examined.

First, a method of sealing the injection nozzle 2 will be described. [Experimental example 3 according to reference example ] (Experimental conditions) As a sealing method of the injection nozzle, Seal-1 to Seaa
The four methods 1-4 were performed. Seal-1: Root seal (FIG. 22 (A)) Seal-2: Tip seal, copper packing (FIG. 23 (A)) Seal-3: Tip seal, copper seal (FIG. 24 (A)) Seal-3: Nozzle Adhesive seal at the cylindrical portion at the tip (FIG. 25 (A)) Pump rotation speed: 1000 rpm (FIGS. 22 to 25 (B), (C)) 2000 rpm (FIGS. 22 to 25 (D), (E)) Injection amount: 54.3 mm ³ / str ((B), (C) in FIGS. 22 to 25) 53.3 mm ³ / str ((D), (E) in FIGS. 22 to 25) LPF: 8 kHz (FIG. 22 to 25 (B) and (D)) 4 kHz (FIGS. 22 to 25 (C) and (E))

Seal-2 using a copper packing 44
[FIG. 23 (B)] absorbs higher frequency components after injection than Seal-3 [FIG. 24 (B)] in which the nozzle tip is sealed with a steel holder. Also, comparing the circled portions in FIG. 23C and FIG. 24C which are the injection rate waveforms after passing through a low-pass filter with a cut-off frequency of 4 kHz, the tip of the injection nozzle 2 is received. The difference in the material appears. In FIG. 23 (C) using copper packing as compared with a steel seal, although a slightly lower frequency noise remains, a result with a lower noise level is obtained. FIG. 23 (E) and FIG. 24 (E) are the same.

[Experimental Example 5 According to Reference Example ] A similar experiment was performed using the sealing method of Seal-3 and Seal-4 of Experimental Example 4 and changing the material of the holder and the sleeve. Here, FIGS. 26 and 27 show a case where the material is changed using a holder having the same shape as that of Seal-3.
8, FIG. 29 has the same shape as FIG. Fig. 26: Holder steel (SK5) sleeve (not used) Fig. 27: Holder copper (C1201) sleeve (not used) Fig. 28: Holder SUS304 sleeve steel (SK5) Fig. 29: Holder SUS304 sleeve copper (C1201)

(Experimental conditions) Pump rotation speed: 1000 rpm (FIGS. 26-29 (A), (B)) 2000 rpm (FIGS. 26-29 (C), (D)) Injection amount: 54.0 mm ³ / Str ((A), (B) in FIGS. 26 to 29) 53.0 mm ³ / str ((C), (D) in FIGS. 26 to 29) LPF: 8 kHz ((A) in FIGS. 26 to 29) ), (C)) 4 kHz ((B), (D) in FIGS. 26 to 29)

26 (A) and FIG. 27 (A), the amount of noise generated after the end of the injection is smaller in the copper holder than in the steel holder, and the attenuation is faster. Also, comparing FIGS. 28 (C) and (D) with FIGS. 29 (C) and (D), it was found that the steel sleeve has a lower noise level than the copper sleeve and the attenuation is faster. In evaluation of the material for sealing the tip, copper was superior to steel in terms of vibration absorption and damping characteristics. However, in the case of the sleeve type, it was found that steel can fix the nozzle more firmly than soft copper, so that it has an effect of suppressing vibration and damping quickly.

Next, the material of the packing will be described. [Experimental Example 6 According to Reference Example ] An experiment was performed using a copper packing and a vibration damping material packing by the method of Seal-2 (FIG. 23) of Experimental Example 4. (Experimental conditions) Pump rotation: 1000 rpm or 2000 rpm LPF: 8 kHz Packing material: copper (C1201) or vibration damping material (manufactured by Daido Special Metals Co., Ltd.)

When the damping material is used as the packing 44 (FIG. 30), it takes a longer time to attenuate and the frequency of the vibration component becomes higher than when copper is used (FIG. 31). Was. Therefore, copper packing is better
It turned out to be suitable as a sealing material. Seal-
The method of sealing the tip with copper shown in No. 2 provided the best S / N.

FIG. 32 is a view showing a second embodiment of the injection rate meter according to the present invention. In this embodiment, an annular piezoelectric film is used as a pressure detecting sensor. The inner wall of the pressure vessel 1 Experimental Example 7 according to Embodiment] As shown in FIG. 32, and the piezoelectric film 51 to 54 affixed to annular, see the influence of the injection rate due to a difference in its position. Piezoelectric films 51 to 54 were formed by cutting a width of 5 mm from Viesel (manufactured by Daikin Industries, Ltd.), and the interval of pasting was 5 mm. In this embodiment, the same block diagram as that shown in FIG. 2 can be used. The output signal P I EZ piezoelectric film 51 to 54
When adding the O-1 to P two of the I EZO-4 is on the input to adder circuit 25, level so are the same, the charge amplifier 20A, previously adjusted the sensitivity of 20B.

(Experimental conditions) Pump rotation: 1000 rpm or 1500 rpm Back pressure: 30 kg / cm ²

FIGS. 34 to 37 show the annular piezoelectric film 5.
FIG. 3 is a diagram showing signals PIEZO-1 to PIEZO-5 of 1 to 54; (A), (B), and (C) of each figure show the injection rate through a low-pass filter (LPF) of fc = 8 kHz, 6 kHz, and 4 kHz, respectively.

First, when passing through an 8 kHz LPF,
The ejection rate from each of the piezoelectric films 51 to 54 and the ejection rate of the PCB 1 are compared. The level of the high-frequency component noise during and after the ejection is lower in the piezoelectric films 51 to 54, and the frequency component is also lower. Thus, it is considered that the influence of the liquid column vibration can be reduced by measuring and combining the pressures at multiple points, rather than by measuring the pressure at only one point on the circumference.

A comparison between the piezoelectric films 51 to 54 will be made. Comparing the injection rate and the noise of the high-frequency component after the end of the injection, the higher the frequency of the high-frequency component noise of the piezoelectric films 51 to 54 becomes as the mounting position approaches the bottom plate Q. Regarding the noise level of the high-frequency component after injection, the outputs PIEZO-2 and PIEZO- of the piezoelectric films 52, 53 and 54 are used.
3, PIEZO-4 is kept small.

Regarding the result of passing through the 4 kHz LPF,
Compare the waveforms in the circles in each figure. Even when the piezoelectric films 51 to 54 having the same shape are used, there is a considerable difference in the waveform depending on the mounting position. Also,
Comparing the waveform of the signal PCB1 detected by the pressure detection sensor 4A as a reference, the signals PIEZO-1, PIEZO-1
In IEZO-2, the sawtooth shape appears significantly,
The liquid column vibration which cannot be removed by the LPF of fc = 4 kHz was measured, and a difference occurred in the waveform during the injection period. In the signals PIEZO-3 and PIEZO-4, since the component of the liquid column vibration included in the injection rate signal has a high frequency, the signal is passed through the LPF of fc = 4 kHz.
Noise was efficiently removed, and the waveform was similar to that of PCB1.

By combining the signals PIEZO1 to PIEZO5 detected by the piezoelectric films 51 to 54, no remarkable result was obtained in that the injection rate and the high-frequency component noise remaining after the end of the injection were canceled. When the signal PIEZO-1 is included as an element to be synthesized, the noise of about 6 kHz of the signal PIEZO-1 has a large influence (circled portion).

In Experimental Example 7, the result was obtained that the combination of the signal PIEZO-2 and the signal PIEZO-4 was minimized in terms of the noise level of the high-frequency component after injection. In the synthesis of the signal PIEZO-3 and the signal PIEZO-4, the result of passing through the 8 kHz LPF results in noise on the injection rate, which is not a very good injection rate. As a result, a considerably good injection rate is obtained.

[0057]

As described above in detail, according to the present invention, the sum of two pressure detecting sensors is obtained as a signal ,
Flat bottom of pressure vessel, center for pressure detection
Pressure vessel by attaching one of the sensors
Can be reduced by reducing the effect of liquid column vibration (pressure wave)
You.

Further, by detecting a pressure change by a ring-shaped piezoelectric element attached to the inner wall of the pressure vessel, the liquid column vibration component can be reduced.

[0059]

[Brief description of the drawings]

FIG. 1 is a view showing a pressure vessel of a first embodiment of an injection rate meter according to the present invention.

FIG. 2 is a block diagram illustrating a signal processing unit of a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 3 is a circuit diagram illustrating an addition processing unit of the injection rate meter according to the first embodiment.

FIG. 4 shows a measurement result (PCB1) of an injection rate meter according to a reference example .
FIG.

FIG. 5 shows the results of measurement of the injection rate meter according to the reference example (PCB2).
FIG.

FIG. 6 is a diagram illustrating measurement results (injection rates of combined signals PCB1 + PCB2) of the injection rate meter according to the reference example .

FIG. 7 is a diagram showing the results of FFT analysis of the injection rate of FIG. 4;

FIG. 8 is a diagram showing the results of FFT analysis of the injection rate of FIG. 5;

FIG. 9 is a diagram showing a result of FFT analysis of the injection rate of FIG. 6;

FIG. 10 is a diagram showing a result of a phase analysis performed with reference to PCB1.

FIG. 11 is a diagram illustrating a mounting position (TYPE1) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 12 is a diagram illustrating a mounting position (TYPE2) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 13 is a diagram illustrating a mounting position (TYPE 3) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 14 is a diagram illustrating a mounting position (TYPE 4) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 15 is a diagram illustrating a mounting position (TYPE5) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 16 is a diagram illustrating a mounting position (TYPE 6) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 17 is a diagram illustrating a mounting position (TYPE 7) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 18 is a diagram illustrating a mounting position (TYPE 8) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 19 is a diagram illustrating a mounting position (TYPE 9) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 20 is a diagram illustrating a mounting position (TYPE0) of a pressure vessel and a pressure detection sensor of the injection rate meter according to the first embodiment.

FIG. 21 is a sectional view showing an injection nozzle of an injection rate meter and a mounting structure thereof according to a reference example .

FIG. 22 is a diagram illustrating a method of sealing an injection nozzle (Seal-1) of an injection rate meter according to a reference example .

FIG. 23 is a diagram illustrating a method (Seal-2) for sealing an injection nozzle of an injection rate meter according to a reference example .

FIG. 24 is a diagram illustrating a method (Seal-3) for sealing an injection nozzle of an injection rate meter according to a reference example .

FIG. 25 is a diagram illustrating a method of sealing an injection nozzle (Seal-4) of an injection rate meter according to a reference example .

FIG. 26 is a diagram illustrating characteristics of a material (copper) of a holder in a method of sealing an injection nozzle of an injection rate meter according to a reference example .

FIG. 27 is a diagram illustrating characteristics of a holder (material) of a method of sealing an injection nozzle of an injection rate meter according to a reference example .

FIG. 28 is a diagram illustrating characteristics of a material (copper) of a sleeve in a method of sealing an injection nozzle of an injection rate meter according to a reference example .

FIG. 29 is a view for explaining characteristics of a material (steel) of a sleeve in a method of sealing an injection nozzle of an injection rate meter according to a reference example .

FIG. 30 is a view for explaining the characteristics of the material (damping material) of the packing of the injection nozzle of the injection rate meter according to the reference example .

FIG. 31 is a diagram for explaining the material (copper) characteristics of the packing of the injection nozzle of the injection rate meter according to the reference example .

FIG. 32 is a view showing a second embodiment of the injection rate meter according to the present invention.

FIG. 33 is a diagram illustrating characteristics of a detection signal (PCB1) according to the second embodiment.

FIG. 34 shows a detection signal (PIEZO-1) of the second embodiment.
FIG. 3 is a diagram for explaining the characteristics of FIG.

FIG. 35 shows a detection signal (PIEZO-2) of the second embodiment.
FIG. 3 is a diagram for explaining the characteristics of FIG.

FIG. 36 shows a detection signal (PIEZO-3) of the second embodiment.
FIG. 3 is a diagram for explaining the characteristics of FIG.

FIG. 37 shows a detection signal (PIEZO-4) of the second embodiment.
FIG. 3 is a diagram for explaining the characteristics of FIG.

FIG. 38 shows a detection signal (PIEZO-1 +) of the second embodiment.
It is a figure explaining the characteristic of PIEZO-2).

FIG. 39 shows a detection signal (PIEZO-1 +) of the second embodiment.
It is a figure explaining the characteristic of PIEZO-3).

FIG. 40 shows a detection signal (PIEZO-1 +) of the second embodiment.
It is a figure explaining the characteristic of PIEZO-4).

FIG. 41 shows a detection signal (PIEZO-2 +) of the second embodiment.
It is a figure explaining the characteristic of PIEZO-3).

FIG. 42 shows a detection signal (PIEZO-2 +) of the second embodiment.
It is a figure explaining the characteristic of PIEZO-4).

FIG. 43 shows a detection signal (PIEZO-3 +) of the second embodiment.
It is a figure explaining the characteristic of PIEZO-4).

FIG. 44 is a cross-sectional view showing a pressure vessel and a testing device of a conventional injection rate meter.

FIG. 45 is a block diagram showing a measuring device of a conventional injection rate meter.

FIG. 46 is a diagram showing measurement timing of a conventional injection rate meter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure container 2 Injection nozzle 3 Temperature sensor 4 Pressure detection sensor 5 Back pressure sensor 6 High-speed solenoid valve 7 Relief valve 8 Verification device 9 Motor 10 Cam 11 Verification piston 12 Linear gauge 13 Rotary engorder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02M 65/00 302-303 G01F ^7/ 00-23/32

Claims (2)

(57) [Claims] A liquid is injected from an injection nozzle into a pressure vessel filled with liquid, and the pressure of the pressure vessel, which increases in proportion to the amount of injection, is detected by a pressure detection sensor to determine an injection rate. In the injection rate meter for measuring, the pressure detection sensor detects at two places of the pressure vessel
To take the components of the sum of the values were, a bottom of the pressure vessel is flat, for the pressure sensing
An injection rate meter , wherein one of the sensors is mounted in the center of the bottom surface. 2. Injecting a liquid from an injection nozzle into a pressure vessel filled with liquid, detecting a pressure of the pressure vessel, which increases in proportion to the amount of the injection, by a pressure detection sensor, and determining an injection rate. In the injection rate meter for measuring, the pressure detection sensor is a thin annular pressure detector attached to the inner wall of the pressure vessel.