JP3439931B2 - Spray pattern measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a spray measuring device capable of quickly and highly accurately measuring a spray pattern such as a spray direction and spread of a fuel injection valve.

The injection characteristic of a fuel injection valve is closely related to the exhaust gas purification performance and fuel consumption performance of an automobile engine.
For example, in an engine with two intake valves, the diameter of the intake port, which is the target for injecting fuel, is small, and unless the direction and spread angle of the spray are controlled accurately, part of the fuel adheres to the wall surface and is sucked into the cylinder. The problem that it is not done occurs. Therefore, it is extremely important to measure the injection characteristics of the fuel injection valve, particularly the direction of spray, the spread angle, the size of spray particles, etc., simply and with high accuracy. Among them, the spray particles can be measured with a fairly high accuracy by using a method such as laser light.

On the other hand, the direction of spray (angle of spray center) and the angle of spread are measured, for example, by taking a photograph of the spray and based on this photograph. As another method, a laser beam attenuation CT (Computed) is performed by using a laser beam.
Methods of forming tomographies are known. That is, a laser beam is applied to the spray, and the light intensity and intensity of the laser beam that is attenuated by the scattering of spray particles are measured by an optical sensor or a TV camera, and arithmetic processing is performed on the measured data to obtain a two-dimensional image of the cross section of the spray. To create.

[0004]

[Problems to be Solved] However, the method of detecting the direction angle and the spread angle of the spray by photographing has a problem in measurement accuracy, and also has a problem that photographing is time-consuming and lacking in speediness. That is, with this method, it is difficult to illuminate the spray evenly, and the image becomes uneven.
Moreover, the boundaries of the spray tend to be unclear. for that reason,
The angle of the center of the spray with respect to the reference line and the spread angle of the spray will also be inaccurate.

The second method using the laser light attenuation CT is to irradiate the spray with laser light from multiple directions,
Since a lot of data needs to be obtained, it takes a long time for measurement, and it also takes a long time for calculation processing, which is not quick. High-performance processing equipment is also required. The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a spray measuring device capable of measuring a spray pattern with high accuracy and speed.

[0006]

A first invention of the present application is a spray measuring device for measuring a spray pattern such as a spray angle and a shape of a spray, and a holding member for holding an object to be inspected for spraying the spray.
The momentum of the spray particles is detected as pressure, and the pressure in a small area is measured.
A pressure detecting means having a pressure sensor for the constant, to set the positional relationship between the pressure sensor of the object to be examined and the pressure sensing means, freely changeable in three-dimensional directions the positional relationship
With respect to the direction in which the spray is ejected , based on the positioning means provided with an effective three-dimensional moving means, and the output signal of the pressure detecting means and the positional relationship data set by the positioning means
Computation means for computing and editing the momentum of the spray or the distribution of pressure due to the momentum in a plane that is substantially vertical and at a predetermined separation distance, and the in-plane edited by the computation means by moving the pressure sensor in a two-dimensional direction . And output means for outputting the distribution of momentum or pressure in
A spray measuring device characterized by measuring force distribution .

What is most noticeable in the spray measuring apparatus of the first invention is that it is equipped with a pressure detecting means for detecting the momentum of the spray particles as a pressure and the positional relationship between the object to be inspected and the pressure detecting means is set. The positioning means is provided. The calculating means is substantially perpendicular to the spraying direction based on the output signal of the pressure detecting means and the position data set by the positioning means.
The momentum of the spray or the distribution of the pressure due to the momentum in the plane at the separation distance is calculated and edited, and the result is output through the output means.

Generally, atomization can be considered as a set of particles having momentum. Then, the momentum held by the aggregate of particles is converted into pressure by colliding with a surface that is not parallel to the spray, and therefore, by measuring the pressure on a predetermined surface, it is possible to measure the direction of the spray . Almost vertical
It is possible to know the distribution of momentum within a plane at a predetermined separation distance . And the result can be obtained almost in real time in a short time. In addition, a pressure sensor with high accuracy and high reliability can be easily obtained, so the measurement accuracy is also high.

Further, the range of the spray (spread angle) can be known from the mode of the distribution, for example, from the boundary region where the pressure sharply decreases and becomes close to zero, and the central position of the pressure distribution (the largest position) The direction angle of the spray can be known from the point). Therefore, the spray pattern such as the spray direction and spread angle can be obtained from the editing result of the calculation means. The output means for displaying the final result and the data include a printing device, a display device, etc., and the voice alarm means can be used alone or in combination with the above device.

The positioning means is constructed as a three-dimensional moving means capable of freely changing the positional relationship between the pressure sensor and the object to be inspected in a three-dimensional direction. And
Using the above moving means, the pressure sensor is moved in a plane perpendicular to the spray and at a predetermined separation distance, and each point (X,
The pressure (momentum) P (X, Y) at Y) is measured.

The above measurement result P (X, Y) is the coordinate (X,
It may be printed as a table showing the relationship between Y) and the pressure P,
Further, it can be graphically displayed as a graph (see FIGS. 2 to 4) showing the relationship between the pressure P and the abscissa X or the ordinate Y, or by converting the magnitude of P into a luminance (black and white) change or color. It can be displayed as a two-dimensional black and white image (see FIG. 5) or as a color image.

According to a second aspect of the present invention, the pressure detecting means is constructed as a one-dimensional sensor array in which pressure sensors for measuring a pressure in a small area are linearly arranged, and the positioning means is provided with the sensor array and the sensor array. The two-dimensional moving means is capable of freely changing the positional relationship with the object to be inspected, that is, the direction in which the spray is ejected and the direction perpendicular to the spray. Then, the pressure sensor is moved in a plane substantially perpendicular to the direction in which the spray is ejected and at a predetermined separation distance, and the pressure distribution in the plane is measured.

According to a third aspect of the present invention, the pressure detecting means is configured as a two-dimensional sensor array in which pressure sensors for measuring pressure in a small area are arranged in a plane, and the positioning means is used to detect the sensor array. It is configured as a one-dimensional moving means that moves close to or away from an object. Then, the sensor array is installed at a predetermined distance with respect to the object to be inspected, and the pressure distribution in a plane substantially perpendicular to the spraying direction is measured.

As described above, according to the present invention, it is possible to obtain the spray measuring device capable of measuring the spray pattern with high accuracy and speed. The spray measuring device can be used, for example, in a device for inspecting a fuel injection valve of an internal combustion engine. That is, it is possible to measure the injection pattern of the fuel injection valve and inspect the quality of the valve.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 As shown in FIG. 1, this embodiment is a spray measuring apparatus 1 for measuring a spray pattern such as a spray angle θ of a spray 85 and a shape,
Fuel injection valve 81 as an object to be inspected for injecting spray 85
Holding means 11 for holding the pressure sensor 21, a pressure sensor 21 for detecting the momentum of the spray particles as pressure, and a positioning means 31 for setting the positional relationship between the object to be inspected and the pressure sensor 21.
And the spray 85 is sprayed based on the output signal of the pressure sensor 21 and the positional relationship data set by the positioning means 31.
The pressure sensor in a two-dimensional direction, and a calculation means 41 for calculating and editing the distribution of the pressure due to the momentum of the spray 85 in a plane substantially perpendicular to the direction in which the pressure sensor is separated.
1 in the plane moved and moved by the calculation means 41
The output means 45 outputs the distribution of the pressure in the dimension.

The pressure detecting means of this example is a pressure sensor 21 for measuring the pressure in a small area, and the positioning means 31 has a positional relationship between the pressure sensor 21 and the fuel spray valve 81 in the horizontal (X) and vertical (Y) directions. , Three-dimensional moving means that can be freely changed in three directions of height (Z). And
The pressure sensor 21 is moved in two directions within a (X, Y) coordinate plane that is substantially perpendicular to the direction in which the spray 85 is jetted and at a predetermined separation distance, and the pressure distribution in the plane is measured.

A supplementary explanation will be given below for each of them. The fuel 80 is supplied from the fuel tank 82 to the spray valve 81,
It is driven by drive circuits 811 and 812. In the figure, reference numeral 821 is a fuel tank pressure meter. The pressure sensor 21 is fixed to the arm 32 of the positioning means 31, and the arm 32 can freely move in three directions (X, Y, Z).

That is, the arm 32 can be moved up and down along the support column 311 and the support column 311 is handled by the handles 312 and 313.
Operate to move back and forth and left and right. And
The electric signal output from the pressure sensor 21 is amplified by the amplifier 22 and input to the arithmetic means 41. In the figure, reference numeral 12 is a container for holding the injected fuel 80.

When the fuel 80 is injected from the fuel spray valve 81, the fuel 80 becomes a spray 85 composed of fine particles and scatters. The injected fuel particles usually have a diameter of several tens of μm.
And the number exceeds hundreds of millions. The particles of the spray 85 are
The kinetic energy of the jet is maintained and the jet proceeds in the jet direction. Then, the diameter of the spray particles is d, the traveling speed is v,
If the density of the fuel 80 is ρ, the momentum of the spray particles is (π
a ^{d 3/6) × ρ ×} v.

The spray particles travel as a group, and the momentum held by the spray becomes an integrated value of the momentum of the fuel particles in the spatial region of the spray. When the spray 85 collides with the detection surface of the pressure sensor 21, the momentum held by the spray 85 is immediately converted into pressure, and the pressure sensor 21 can measure the pressure P within a short time. The detected pressure P increases as the momentum of the spray increases and the density of the spray particles increases.

In other words, by measuring the pressure P in the set area, the density of the spray particles in that area can be known. Then, by displaying the pressure (density) of each area two-dimensionally, it is possible to know in which area the spray particles are dense. Then, the direction angle of the spray 85 can be known by selecting the point having the highest density from this pressure (density) distribution and calculating the positional relationship with the injection port of the spray valve 81. Further, the spread angle θ of the spray 85 can be calculated from the boundary at which the pressure (density) of the spray 85 attenuates near zero. In addition, these results can be obtained almost in real time with almost no time delay.

2 and 3 show sensor output values (mV) on the X-axis and the Y-axis in the case of a high-pressure gasoline injection valve.
Is an example of what is graphically displayed on the display screen of the output means 45 (3 mS after the injection pulse is applied). Also,
As shown at the left end of the figure, coloring can be done according to the size of the sensor output, and the whole can be displayed in color if shown in the (X, Y) plane.

FIG. 4 is a graph showing an example of the sensor output value on the X axis for a 2-hole type fuel injection valve, which is measured at a position 50 mm below the fuel injection valve 81 (injection). 6 mS after pulse application). FIG. 5 is an example of a diagram in which the lightness (black and white) is changed according to the output of the sensor and is shown in the (X, Y) plane. In the pattern divided into left and right in FIG.
Find the line that connects the highest point and the injection port of the injection valve 81, and
The angle of the spray injected in the direction can be known.

Further, the spread angle θ of each spray can be calculated from the boundary where the spray pressure (density) in each of the two spray patterns decays to near zero. As shown in the graphs of FIGS. 2 to 4, according to the present device 1, the pressure distribution (particle distribution) of the spray 85 can be detected in extremely detail. Therefore, the spray measuring device 1 of this example
According to this, the direction angle and spread angle of the spray of the fuel injection valve 81 can be measured with high accuracy and speed. In addition, the measurement result can be obtained within a short time with almost no time delay.

Embodiment 2 As shown in FIGS. 6 and 7, the spray measuring apparatus 1 of this embodiment is similar to Embodiment 1 except that the pressure detecting means has a sensor element 251 (FIG. 8) for measuring pressure in a small area. ) Linearly arranged in the lateral (X coordinate) direction
The positioning means 35 can freely change the positional relationship between the sensor array 25 and the fuel injection valve 81 in two directions, ie, the Z direction, which is the direction in which the spray is injected, and the Y direction, which is perpendicular to the spray. It is a means of dimension movement. The sensor array 25 includes the left and right arms 3 of the positioning means 35.
It is attached between 51 and 352.

The apparatus 1 is implemented by moving the sensor array 25 in the Y direction within the (X, Y) plane that is substantially perpendicular to the direction in which the spray is sprayed and is at a predetermined distance from the injection valve 81. The pressure distribution of the spray in the plane is measured in the same manner as in the first embodiment. As shown in FIG. 8, each sensor element 251 constituting the sensor array 25 is signal-amplified by an amplifier 252 and A / D converted, and then scanned by a multiplexer 253 and input to the personal computer 40.

In this example, the arithmetic processing performed by the arithmetic means is executed by the program of the personal computer 40, and the same result as that shown in FIGS. 2 to 5 is obtained by the display 43 (FIG. 7, FIG. 7) of the personal computer 40.
8) is displayed. Others are the same as those in the first embodiment.

[0028]

As described above, according to the present invention, it is possible to obtain the spray measuring device capable of measuring the spray pattern with high accuracy and speed.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a spray measurement device according to a first embodiment.

FIG. 2 is a diagram showing a pressure distribution (sensor output value) on the X-axis of the spray of the high-pressure gasoline injection valve measured by the spray measurement device of the first embodiment.

FIG. 3 is a diagram showing a pressure distribution (sensor output value) on the Y axis of the spray of the high-pressure gasoline injection valve measured by the spray measurement device of the first embodiment.

FIG. 4 is a diagram showing a pressure distribution (sensor output value) on the X-axis of the spray of the 2-hole type fuel injection valve measured by the spray measurement device of the first embodiment.

FIG. 5 is a diagram showing the pressure distribution (sensor output value) of the spray of the two-hole type fuel injection valve measured by the spray measurement device of the first embodiment, converted into light and dark.

FIG. 6 is a perspective view of the vicinity of the spray measuring unit of the spray measuring apparatus according to the second embodiment.

FIG. 7 is a front view of the spray measuring device according to the second embodiment.

FIG. 8 is a circuit diagram of a signal input to a personal computer in the spray measurement device according to the second embodiment.

[Explanation of symbols]

11,110. ． ． Holding means, 21, 25. ． ． Pressure detection means (pressure sensor), 31, 35. ． ． Positioning means, 40, 41. ． ． Computing means, 43, 45. ． ． Output means, 81. ． ． Object to be inspected (injection valve), 85. ． ． Spray,

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keisou Takeda 1 Toyota-cho, Toyota City, Aichi Prefecture, Toyota Motor Corporation (72) Inventor Minoru Ogawa 1-cho, Toyota City, Aichi Prefecture, Toyota Motor Corporation (56) References JP-A-9-49472 (JP, A) JP-A-2-130260 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01M 15/00 F02M 65 / 00 306

Claims (3)

(57) [Claims] 1. A spray measuring device for measuring a spray pattern such as a spray angle and a shape of spray, which comprises a holding member for holding an object to be inspected for spraying, and a momentum of spray particles as pressure , Measure small area pressure
It is possible to set a positional relationship between the pressure detecting means having a pressure sensor and a pressure sensor of the object to be inspected and the pressure detecting means , and to change the positional relationship freely in a three-dimensional direction.
Based on the positioning means including the three-dimensional moving means, the output signal of the pressure detecting means, and the positional relationship data set by the positioning means, the spray is substantially perpendicular to the spraying direction.
A calculation means for calculating and editing the momentum of the spray or a distribution of pressure due to the momentum in a plane directly at a predetermined separation distance, and the pressure sensor is moved in a two-dimensional direction, and in the plane edited by the calculation means . Output means for outputting momentum or pressure distribution, and pressure in the plane
A spray measuring device characterized by measuring the distribution . 2. The pressure detecting means according to claim 1, wherein the pressure detecting means has a one-dimensional sensor array in which pressure sensors for measuring pressure in a small area are linearly arranged, and the positioning means includes the sensor array and the test object. Equipped with a two-dimensional moving means that can freely change the positional relationship with the target object in two directions, the direction in which the spray is sprayed and the direction perpendicular to the spray, and is substantially perpendicular to the direction in which the spray is sprayed. 2. A spray measuring device, characterized in that the pressure sensor is moved within a plane at a predetermined separation distance to measure the pressure distribution in the plane. 3. The pressure detecting means according to claim 1, which is a two-dimensional sensor array in which pressure sensors for measuring pressure in a small area are arranged in a plane, and the positioning means uses the sensor array as an object to be inspected. It is equipped with a one-dimensional moving means for moving it closer to or further away from the object, the sensor array is installed at a predetermined distance with respect to the object to be inspected, and the distance is substantially perpendicular to the spraying direction and at a predetermined distance. spray measuring apparatus characterized by measuring the pressure distribution definitive in the plane.