JP3841508B2 - Injection quantity measuring device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an injection amount measuring device employed in an intermittent liquid injection device such as a liquid fuel injection device for an internal combustion engine, and more particularly to an injection amount measuring device that measures an injection amount for each liquid injection by the liquid injection device. .
[0002]
[Prior art]
Conventionally, as a device for measuring the liquid fuel injection amount for each injection, a plurality of liquids are accumulated in a container, the weight thereof is measured with an electronic balance, and the value is divided by the number of injections to obtain an injection amount per one time. There is something to measure.
Further, as disclosed in Japanese Patent Application Laid-Open No. 8-121288, there is an apparatus that obtains an injection amount by integrating an injection rate measured using an apparatus based on an injection momentum method.
[0003]
[Problems to be solved by the invention]
However, in a conventional apparatus for measuring the injection amount with an electronic balance, the measurement principle is feedback control so that the position of the weighing platform is constant. Accordingly, since the response time is as long as 1 to 2 seconds, measurement in the actual machine operating frequency range is impossible.
For this reason, only the method of obtaining the injection amount at the time of one injection from the average value of a plurality of injection amounts is generally used, and in this method, the injection amount for each injection is continuously accurately determined. It is difficult to measure.
[0004]
Moreover, in the apparatus by the said injection momentum method, since it measures on the exit side of a fuel injection valve, the spray shape of the fuel by a fuel injection valve will change. Therefore, when this device is mounted on a fuel injection device, a good fuel injection state cannot be ensured.
In order to deal with the above-described problems, the present invention provides an injection amount measuring device that continuously and accurately measures the injection amount for each injection of the liquid without affecting the spray shape of the liquid. Objective.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to any one of claims 1 to 4 includes a cylindrical body that extends vertically from an upstream pipe line of a liquid ejecting means that ejects liquid intermittently, and a cylindrical body and an upstream pipe. A liquid replenishing unit that intermittently replenishes the liquid in the path and a measuring unit that measures the amount of liquid in the cylinder at a liquid level .
[0006]
Then, based on the change before and after the ejection of the liquid ejecting means at the measured liquid level , the liquid replenishing means supplies the liquid to the liquid ejecting means so that the liquid amount in the cylinder becomes a predetermined amount before the ejection of the liquid ejecting means. Refill the upstream pipeline by one injection amount. Thereby, the amount of liquid ejected by the liquid ejecting means can be continuously measured for each ejection. In this case, since it is only necessary to measure the amount of liquid in the cylinder, measurement errors due to noise, vibration of the liquid surface of the liquid, and the like are small, and highly accurate measurement is possible.
[0007]
In addition, since the measurement is performed on the upstream side of the liquid ejecting unit, the liquid spray shape by the liquid ejecting unit is not adversely affected. Therefore, it is possible to perform good measurement in a state where the present invention is installed in an actual machine.
Here, as for the said effect, like the invention of Claim 2 thru | or 4, a measurement means has a light projection system and a light reception system, an ultrasonic transmitter / receiver, or has both electrodes. Can be achieved similarly.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 shows an example in which a first embodiment of an injection amount measuring apparatus according to the present invention is applied to a four-cylinder internal combustion engine EG for a vehicle. The application object of the present invention is not limited to the above-described internal combustion engine, but various internal combustion engines (internal combustion engines for vehicles other than four cylinders, internal combustion engines for motorcycles, combined internal combustion engines, etc.), and intermittent liquids. The apparatus which injects may be sufficient.
[0009]
The injection amount measuring device includes a substantially inverted T-shaped base pillar member 10 fixed to a stationary member (not shown) of the vehicle. Here, the base column member 10 includes a horizontal column portion 10a positioned horizontally and a cylindrical vertical tube portion 10b extending vertically upward from an intermediate portion in the longitudinal direction of the horizontal column portion 10a. ing.
In addition, the injection amount measuring apparatus includes a light projecting system S and a light receiving system R attached to the vertical cylinder portion 10b. The light projecting system S has a casing 20, and the casing 20 is fitted into an opening 11 formed on the one side of the vertical center portion of the vertical cylinder portion 10 b at the transparent window portion 21. It is supported by the vertical cylinder part 10b.
[0010]
Further, the light emitting element 30 and the cylindrical lens 40 are accommodated in the casing 20. The light emitting element 30 is composed of a semiconductor-type red laser element that emits laser light having a wavelength of 670 nm. The light emitting element 30 is fixed to the lower portion 22 of the casing 20.
The cylindrical lens 40 is disposed between the light emitting element 30 and the transparent window portion 21, and this cylindrical lens 40 converts the laser light from the light emitting element 30 into parallel light, passes through the transparent window portion 21, and passes through the vertical cylinder. The light is emitted into the hollow portion of the portion 10b.
[0011]
The light receiving system R has a casing 50, and the casing 50 has an opening 12 (opposite to the opening 11) formed on the transparent window portion 51 on one side of the vertical center portion of the vertical cylinder portion 10 b. And is supported by the vertical cylinder portion 10b.
A light receiving element 60 is housed in the casing 50, and the light receiving element 60 is configured by arranging a CCD array in a one-dimensional shape in the vertical direction along the inner surface of the transparent window 51. Thereby, the light receiving element 60 receives the laser beam emitted from the transparent window portion 21 of the casing 20 through the glass tube 70 described later and generates a light reception signal.
[0012]
The glass tube 70 is supported concentrically with the vertical tube portion 10 b in the hollow portion of the vertical tube portion 10 b, and the upper end portion 71 of the glass tube 70 is connected to the outlet of the joint member 13. On the other hand, the lower end portion 72 of the glass tube 70 is connected to one end of the crank communication passage 14 in the horizontal column portion 10a.
Here, the axis of the glass tube 70, the vertical center line shown in FIG. 1 of the parallel laser light from the cylindrical lens 40, and the longitudinal center line of the light receiving element 60 are parallel to each other and located in the same vertical plane. is doing.
[0013]
The joint member 13 is connected to the high-pressure cylinder G through the metal pipe P1, the surge tank 82, the pressure relief valve 83, the pressure control valve 80, and the metal pipe P2 at the inflow port.
Thereby, compressed fluid such as nitrogen or air from the high pressure cylinder G is pumped into the glass tube 70 through the metal pipe P2, the pressure control valve 80, the metal pipe P1, and the joint member 13. However, the pressure control valve 80, the surge tank 82, and the pressure relief valve 83 serve to regulate the pressure in the vertical cylinder portion 10b to a predetermined pressure. The pressure relief valve 83 serves to relieve the pressure in the glass tube 70 that has become higher due to the fuel supply of a fuel supply valve 90 described later.
[0014]
The fuel supply valve 90 is accommodated in the recess 15 of the horizontal column portion 10a along the longitudinal direction thereof. The fuel supply valve 90 is a joint fitted at one end of the horizontal column portion 10a at the inlet 91. The outlet of the member 15 is connected. Further, the outlet 92 of the fuel supply valve 90 communicates with the intermediate passage through the communication passage 14 via the end wall of the recess 15.
Accordingly, the fuel supply valve 90 pressure-feeds the liquid fuel pumped from the fuel tank 100 into the intermediate portion of the communication passage 14 as will be described later. Thereby, the liquid fuel from the fuel supply valve 90 flows into the glass tube 70 in a closed state of the fuel injection valve 120 described later. The liquid fuel rises to a predetermined level indicated by symbol L in FIG. The set pressure of the pressure adjustment valve 110 is set to a value higher than the set pressure of the pressure adjustment valve 80.
[0015]
The joint member 15 is connected to an intermediate portion of the metal pipe P1 through the metal pipe P3, the fuel tank 100, the metal pipe P4, the pressure control valve 110, and the metal pipe P5 at the inflow port.
Thus, when the high-pressure fluid in the high-pressure cylinder G is pumped into the fuel tank 100 through the upstream portion of the metal pipe P2, the metal pipe P5, the pressure control valve 110, and the metal pipe P4, the liquid fuel in the fuel tank 100 is In response to the pressure of the pumping fluid, the pump is pumped to the fuel supply valve 90 through the metal pipe P3 and the joint member 15.
[0016]
As shown in FIG. 2, the fuel injection valve 120 is attached to the intake manifold of the internal combustion engine EG together with the other three fuel injection valves. The fuel injection valve 120 serves as a fuel injection valve for measurement by the injection amount measuring device and for fuel injection to the internal combustion engine EG, while the other fuel injection valves serve as fuel injection valves for the internal combustion engine EG. To play a role. The fuel injection valve 120 and the other fuel injection valves are opened at an appropriate drive timing (see reference numeral D1 in FIG. 3) by the fuel injection device of the internal combustion engine of the vehicle. The member 131, the delivery pipe 130, the joint member 132, the metal pipe P6, and the joint member 16 are connected to the other end of the communication path 14 of the horizontal column portion 10a. As a result, the fuel injection valve 120 pressure-feeds the liquid fuel in the communication passage 14 through the metal pipe P6 and the delivery pipe 130 and injects it into the intake manifold of the internal combustion engine EG. The pipe member 131 and the joint member 132 are connected to both opposing wall portions of the delivery pipe 130.
[0017]
A partition plate 133 is provided in the delivery pipe 130, and the partition plate 133 partitions the interior of the delivery pipe 130 into both chambers 130a and 130b. As a result, the pipe member 131 and the joint member 132 communicate with each other in the chamber 130a, while the pipe member 134 for connecting the remaining fuel injection valves and the fuel pump for the internal combustion engine EG (not shown) in the chamber 130b. ) Communicates with a fuel inflow pipe member port 134 for pressure-feeding the liquid fuel. In FIG. 2, reference numeral 136 denotes a pressure regulator connected to another fuel tank and a surge tank of the internal combustion engine EG.
[0018]
Next, the drive circuit configuration of the fuel supply valve 90 will be described. The injection amount calculation circuit 140 converts the light reception signal of the light receiving element 60 into a level (see reference numeral Vf in FIG. 3) before the injection of the fuel injection valve 120 (see reference numeral D1 in FIG. 3) and after the end of injection. The fuel injection amount Q is calculated based on the following equation 1 by taking in twice at the level (see reference numeral Va in FIG. 3).
[0019]
[Expression 1]
Q = Cross section area of glass tube 70 × (Vf−Va) × α
Here, Vf represents a level above the level V of the received light signal taken before the fuel injection valve 120 injects. Va represents a level above the level V of the received light signal taken after the fuel injection valve 120 injects. α represents a constant for converting the level of the received light signal into a length.
[0020]
Specifically, for example, the fuel injection amount Q is obtained by substituting Vf = Vf1 and Va = Va1 (see FIG. 3) into the equation (1).
The pulse width calculation circuit 150 calculates the pulse width τ according to the calculated injection amount Q of the injection amount calculation circuit 140 based on the following equation (2), and outputs it to the replenishing valve drive circuit 160 as pulse data.
[0021]
[Expression 2]
τ = β × Q
Here, β is a pulse width conversion count for injecting the fuel injection amount Q by the fuel supply valve 90.
The replenishing valve drive circuit 160 counts the cycle of the pulse data to the fuel injection valve 120 by a frequency counter (not shown), and based on this count value, the injection timing of the fuel injection valve 120 (see symbol D1 in FIG. 3). In the meantime, the fuel supply valve 90 is driven and controlled to inject at the timing indicated by the symbol D2 in FIG.
[0022]
In the first embodiment configured as described above, the internal combustion engine EG and the injection amount measuring device are operated. Here, it is assumed that the liquid fuel exists in the glass tube 70 up to a predetermined level L in FIG. In addition, the liquid level of the liquid fuel in the glass tube 70 can be accurately maintained at the predetermined level L because of the pressure regulating action of the pressure control valve 100.
[0023]
In such a state, the parallel laser light emitted from the cylindrical lens 40 based on the laser light of the light emitting element 30 passes through the transparent window portion 21 of the casing 20, the glass tube 70, and the transparent window portion 51 of the casing 50 to the light receiving element 60. Incident.
At this time, as described above, the liquid fuel exists in the glass tube 70 up to the height of the predetermined level L in FIG.
[0024]
For this reason, the laser beam emitted from the transparent window portion 21 is scattered in the portion of the glass tube 70 having no liquid fuel, and is transmitted as it is in the portion of the glass tube 70 having the liquid fuel. Note that scattering in the portion of the glass tube 70 without liquid fuel is generated by the remaining fuel portion adhering to the inner wall of the glass tube 70.
In other words, the amount of laser light transmitted through the liquid fuel in the glass tube 70 differs with the predetermined level L as a boundary. Specifically, the amount of light transmitted through a portion of the glass tube 70 above a predetermined level L is significantly reduced compared to the amount of light transmitted through a fuel portion lower than the predetermined level L. This means that the intensity of the transmitted light in the portion of the glass tube 70 above the predetermined level L is significantly lower than the intensity of the transmitted light in the fuel portion lower than the predetermined level L.
[0025]
Accordingly, the light receiving element 60 generates a light receiving signal using the difference between the two intensities as a threshold value, the injection amount calculating circuit 140 calculates the fuel injection amount Q based on the light receiving signal, and the pulse width calculating circuit 150 performs this calculation. The pulse width τ is calculated according to the injection amount Q and is output to the replenishing valve drive circuit 160 as pulse data.
For this reason, the refill valve drive circuit 160 injects fuel at the timing indicated by the symbol D2 in FIG. 3 between the injection timings of the fuel injector 120 (see the symbol D1 in FIG. 3). 90 is driven and controlled.
[0026]
As a result, the fuel supply valve 90 injects the liquid fuel in the fuel tank 100 into the communication path 14. In this case, the injection amount of the fuel supply valve 90 is set so that the liquid fuel rises to a predetermined level L in the glass tube 70.
For this reason, the liquid fuel injected into the communication path 14 flows into the glass tube 70 to a predetermined level L.
[0027]
After that, when the injection timing of the fuel injection valve 120 is reached, the fuel injection valve 120 injects the replenishment fuel of the fuel replenishment valve 90 in the glass tube 70, the communication path 14, the pipe P6 and the like. Thereafter, the above operation is repeated.
As described above, in the first embodiment, the amount of fuel in the vertical column portion 10b on the upstream side of the fuel injection valve 120 is measured at the liquid level by the light projecting system S and the light receiving system R. . Then, as described above, the fuel supply valve 90 is operated by the supply valve driving circuit 160 based on the calculation of the injection amount calculation circuit 140 and the pulse width calculation circuit 150 based on the amount of change of the measurement result before and after the injection of the fuel injection valve 120. Driven. Accordingly, the liquid fuel is replenished by one injection amount of the fuel injection valve 120 so that the fuel amount in the vertical column portion 10b becomes a predetermined level L every time before the injection of the fuel injection valve 120.
[0028]
Thereby, the amount of fuel injected from the fuel injection valve 120 can be continuously measured for each injection. In this case, since it is only necessary to measure the amount of fuel in the vertical column portion 10b, measurement errors due to noise, vibration of the fuel liquid level, and the like are small, and high-precision measurement is possible.
Further, since the measurement is performed on the upstream side of the fuel injection valve 120, the spray shape of the liquid fuel by the fuel injection valve 120 is not adversely affected. Therefore, it is possible to perform good measurement in a state where the injection amount measuring device of the present embodiment is mounted on the internal combustion engine EG.
[0029]
Since there is no need to place a tracer in the liquid fuel unlike the measurement with a laser Doppler velocimeter, there is no change in the fuel properties, and the measurement accuracy is due to the nonuniformity of the tracer particles and the change of the laser focus due to vibration of the internal combustion engine. There is no decline.
Moreover, there is no measurement error due to overheating of the liquid fuel by the hot wire, response delay due to the heat capacity of the hot wire, and influence of fuel temperature change, as in the case of the hot wire anemometer. Does not occur. In addition, there is no problem such as a decrease in measurement accuracy in the low flow velocity region of the hot wire.
(Second Embodiment)
FIG. 4 shows the main part of the second embodiment of the present invention.
[0030]
In the second embodiment, in the base column member 10 described in the first embodiment, the cylindrical vertical tube portion 10c is extended from the horizontal column portion 10a in the same manner instead of the vertical tube portion 10b. Is formed. The joint member 13 communicates with the upper end portion of the vertical cylinder portion 10c.
In the second embodiment, the ultrasonic transceiver 170 is mounted on the upper wall of the hollow portion of the vertical cylinder portion 10c instead of the light projecting system S and the light receiving system R described in the first embodiment. Yes.
[0031]
The ultrasonic transmitter / receiver 170 includes a transmitter 171 and a receiver 172. The transmitter 171 and the receiver 172 are disposed adjacent to each other on the upper wall of the hollow portion of the vertical cylindrical portion 10c. ing.
Thus, the transmitter 171 transmits ultrasonic waves toward the liquid surface of the liquid fuel in the vertical cylinder portion 10c as in the case of the vertical cylinder portion 10b. On the other hand, the receiver 172 receives the ultrasonic wave reflected by the liquid fuel surface and generates a reception signal.
[0032]
The injection amount calculation circuit 140 takes in the received signal from the receiver 172 twice at the liquid level before the start of the injection of the fuel injection valve 120 and after the end of the injection, and uses both of the following equations 3 and 4. Based on this, the fuel injection amount Q is calculated.
[0033]
[Equation 3]
R = T × α
[0034]
[Expression 4]
Q = R2-R1
Here, R is the liquid level of the liquid fuel in the vertical cylinder portion 10c. T is the time until the ultrasonic wave transmitted from the transmitter 171 is reflected by the liquid level of the liquid fuel and received by the receiver 172. R2 is the liquid level after injection of the fuel injection valve 120, while R1 is the liquid level before injection of the fuel injection valve 120. Other configurations are the same as those in the first embodiment.
[0035]
In the second embodiment configured as described above, the same effects as those of the first embodiment can be achieved by the ultrasonic transceiver 170 instead of the light projecting system S and the light receiving system R.
(Third embodiment)
FIG. 5 shows a main part of the third embodiment of the present invention.
[0036]
In the third embodiment, in the base pillar member 10 described in the first embodiment, the cylindrical vertical tube portion 10d (made of an insulating material) is replaced with the vertical tube portion 10b in the same manner as the horizontal member. It extends from the column part 10a. The joint member 13 communicates with the upper end portion of the vertical cylindrical portion 10d.
In the third embodiment, the capacitance sensor 180 is provided in the hollow portion of the vertical cylindrical portion 10d instead of the light projecting system S and the light receiving system R described in the first embodiment.
[0037]
The capacitance sensor 180 includes a pair of flat electrodes 181 and a detection circuit 182. As shown in FIG. 5, the pair of electrodes 181 are attached to the inner peripheral wall of the hollow portion of the vertical cylinder portion 10 d so as to face each other via liquid fuel. In this case, both the electrodes 181 are insulated from each other, and both the electrodes 181 are connected to the detection circuit 182 through the hermetic seal 181a and the both leads 181b. Note that these electrodes 181 may have a long shape instead of a flat shape.
[0038]
Here, when the distance between the two electrodes 181 is small, the capacitance C between the two electrodes 181 is calculated based on the following equation (5).
[0039]
[Equation 5]
C = εS / d
Here, ε is a composite dielectric constant of both air and liquid fuel in the hollow portion of the vertical cylindrical portion 10d. S is the surface area of the electrode 181, and d is the distance between the two electrodes 181. The composite dielectric constant ε varies according to the liquid level of the liquid fuel in the vertical cylinder portion 10d.
[0040]
The detection circuit 182 includes the AC bridge circuit shown in FIG. 6, and this detection circuit 182 detects the electrostatic capacitance C based on the voltage generated according to the composite dielectric constant ε between both electrodes 181. The capacitance C may be detected by the resonance method shown in FIG. According to the AC bridge circuit and the resonance method, there is a response of about 100 kHz and the sensitivity is extremely high.
[0041]
The injection amount calculation circuit 140 calculates the injection amount Q by the following equation 6 based on the detection output of the detection circuit 182.
[0042]
[Formula 6]
Q = γ · C
Here, γ is a constant that varies depending on the material, temperature, and humidity of the medium between the electrodes 181.
In addition, although the formula of Formula 6 has shown the relationship between the electrostatic capacitance C and the injection quantity Q, since C has a fixed relationship with the liquid level of the liquid fuel in the vertical cylinder part 10d, it is electrostatic. The injection amount Q may be calculated based on a change in the liquid level converted from the capacity C (difference between both liquid levels before and after the fuel injection valve 120 injection). Other configurations are the same as those in the first embodiment.
[0043]
In the third embodiment configured as described above, the same effect as that of the first embodiment can be achieved by the electrostatic capacity sensor 180 instead of the light projecting system S and the light receiving system R.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the delivery pipe of FIG.
3 is a timing chart showing the injection timing of the fuel supply valve, the injection timing of the fuel injection valve, and the timing of taking in the level of the light reception signal of the light receiving element in FIG. 1;
FIG. 4 is a partially broken enlarged view showing a main part of a second embodiment of the present invention.
FIG. 5 is a partially broken enlarged view showing a main part of a third embodiment of the present invention.
FIG. 6 is a capacitance change detection circuit diagram in the third embodiment.
FIG. 7 is a graph showing detection characteristics of the capacitance detection circuit.
[Explanation of symbols]
G: High-pressure cylinder, P1 to P6: Metal piping, R: Light receiving system, S: Light projecting system,
10b, 10c, 10d ... vertical column part, 14 ... communication path, 70 ... glass tube,
90 ... refueling valve, 100, 110 ... pressure control valve, 120 ... fuel injection valve,
140 ... injection amount calculation circuit, 150 ... injection width calculation circuit,
160 ... replenishment valve drive circuit, 170 ... ultrasonic transceiver,
180: Capacitance sensor.

Claims (4)

Cylinders (10b, 10c, 10d, 70) extending vertically from the upstream pipes (P6, 14) of the liquid ejecting means (120) for ejecting liquid intermittently;
Liquid replenishing means (G, P2, P5, 110, P4, 100, P3, 90, 140 to 160) for intermittently replenishing the liquid into the cylindrical body and the upstream pipe line;
Measuring means (S, R, 170, 180) for measuring the amount of the liquid in the cylindrical body at a liquid level ;
Based on the change before and after the liquid ejecting means ejects the liquid replenishing means at the measured liquid level , the liquid replenishing means adjusts the liquid so that the liquid amount in the cylinder becomes a predetermined amount before each ejection of the liquid ejecting means. An injection amount measuring device for replenishing the upstream pipe line by one injection amount of the liquid injection means. Cylinders (10b, 10c, 10d, 70) extending vertically from the upstream pipes (P6, 14) of the liquid ejecting means (120) for ejecting liquid intermittently;
Liquid replenishing means (G, P2, P5, 110, P4, 100, P3, 90, 140 to 160) for intermittently replenishing the liquid into the cylindrical body and the upstream pipe line;
Measuring means (S, R, 170, 180) for measuring the amount of the liquid in the cylinder,
Based on the change in the measured liquid amount before and after the ejection of the liquid ejecting means, the liquid replenishing means supplies the liquid so that the liquid amount in the cylinder becomes a predetermined amount before each ejection of the liquid ejecting means. An injection amount measuring device for replenishing the upstream pipe line by one injection amount of liquid injection means,
The cylinder is a transparent tube (70);
The measuring means has a light projecting system (S) for projecting light toward the transparent tube, and a light receiving system (R) for receiving light from the light projecting system through the transparent tube, Measure the amount of the liquid in the transparent tube at the liquid level based on the amount of light received by the light receiving system,
The liquid replenishing means has calculating means (140, 150, 160) for calculating one ejection amount of the liquid ejecting means based on a change before and after the ejection of the liquid ejecting means at the measured liquid level. injection amount measuring device you characterized in that only the calculated injection quantity is supplied to the upstream pipe. Cylinders (10b, 10c, 10d, 70) extending vertically from the upstream pipes (P6, 14) of the liquid ejecting means (120) for ejecting liquid intermittently;
Liquid replenishing means (G, P2, P5, 110, P4, 100, P3, 90, 140 to 160) for intermittently replenishing the liquid into the cylindrical body and the upstream pipe line;
Measuring means (S, R, 170, 180) for measuring the amount of the liquid in the cylinder,
Based on the change in the measured liquid amount before and after the ejection of the liquid ejecting means, the liquid replenishing means supplies the liquid so that the liquid amount in the cylinder becomes a predetermined amount before each ejection of the liquid ejecting means. An injection amount measuring device for replenishing the upstream pipe line by one injection amount of liquid injection means,
The measurement means includes an ultrasonic transceiver (170) that transmits ultrasonic waves toward the liquid level of the liquid in the cylinder and receives reflected ultrasonic waves from the liquid level. Measure the amount of the liquid in the cylinder based on ultrasound at the liquid level,
The liquid replenishing means has calculating means (140, 150, 160) for calculating one ejection amount of the liquid ejecting means based on a change before and after the ejection of the liquid ejecting means at the measured liquid level. injection amount measuring device you characterized in that only the calculated injection quantity is supplied to the upstream pipe. Cylinders (10b, 10c, 10d, 70) extending vertically from the upstream pipes (P6, 14) of the liquid ejecting means (120) for ejecting liquid intermittently;
Liquid replenishing means (G, P2, P5, 110, P4, 100, P3, 90, 140 to 160) for intermittently replenishing the liquid into the cylindrical body and the upstream pipe line;
Measuring means (S, R, 170, 180) for measuring the amount of the liquid in the cylinder,
Wherein the liquid supply means, based on the injection of before and after the change of the liquid ejecting means in the measuring liquid quantity, so that the liquid amount of the cylindrical body before each injection of the liquid injection means reaches a predetermined amount, the liquid body An injection amount measuring device for replenishing the upstream pipe line by one injection amount of the liquid injection means,
The measurement means has both long electrodes (180) arranged opposite to each other along the axial direction in the cylinder, and the measurement means includes a voltage corresponding to a dielectric constant between the two electrodes. Measuring the amount of the liquid;
The liquid replenishing means includes calculating means (140, 150, 160) for calculating one ejection amount of the liquid ejecting means based on a change in the measured liquid amount before and after the ejection of the liquid ejecting means. by the calculated injection quantity characterized in that supplied to the upstream pipe injection amount measuring device.

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