JPS6069565A - Fluid inertia sensor - Google Patents

Abstract

PURPOSE:To simplify structure and reduce manufacture cost by arranging a spherical body which is pivoted rotatably and has large inertial efficiency in a spherical hollow body and flowing fluid. CONSTITUTION:When slightly pressurized fluid is supplied into a fluid input pipe 5, this fluid flows along the circumferential surface of the spherical body 4 as shown by an arrow and is then discharged from a fluid output pipe 6. In this case, the fluid flowing through the upper and lower parts in the spherical body 4 is stationary fluid, so the spherical body 4 holds a fixed state continuously. For example, when an automobile of a system mounting a fluid inertia sensor 1 is turned as shown by an arrow A, the fluid input and output pipes 5 and 6 and spherical hollow body 2 rotate, but the spherical body 4 having the large inertial efficiency holds the fixed state. Then, the fluid becomes unbalanced in flow rate between the upper and lower parts in the spherical body 4 to generate a pressure difference. The pressure difference is detected by pressure sensors 7 and 8 and supplied to a comparator 9. This comparator 9 generates an analog output with the level corresponding to the revolving angular speed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an inertial sensor, and more particularly to a driftwood inertial sensor using a fluid.

BACKGROUND ART In recent years, with the rapid development of electronic technology, it has become easier to detect the moving direction, moving layer, and moving speed of each plant. For example, in the case of automobiles, systems have been developed that display the current position of automobiles by detecting their moving direction and moving speed. In this case, an inertial sensor is used as a sensor for detecting the moving direction and moving speed of the automobile.

The most popular inertial sensors are those that use a gyro such as a gyro or a fluid.

However, the above-mentioned conventional inertial sensor requires high-precision machining and complicated IAlIf, and therefore has the problem of being expensive and difficult to handle.

DEVELOPMENT OF THE INVENTION It is therefore an object according to the invention to provide an inertial sensor that is simple and inexpensive in construction and in its handling.

In order to achieve such an object, the present invention includes: a spherical hollow body provided in a part of a fluid passage; a spherical body rotatably supported inside the spherical hollow body; +iiJ
Pressure sensors are provided at two points directly in the axial direction supporting the spherical body in the spherical hollow body and orthogonal to the input/output direction of the fluid, and the output difference of the pressure sensors is used to detect pressure sensors. The rotation angle is determined by detecting the p angular velocity and integrating the output difference over time.

The fluid inertial sensor configured in this manner has excellent effects in that it has a simple structure, can easily detect angular velocity and rotation angle, and can be manufactured at low cost.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of essential parts of an embodiment of a fluid inertial sensor according to the present invention. In the figure, numeral 12 is a fluid inertial sensor, which includes a spherical hollow body 2 provided in a part of the fluid communication, and a spherical hollow body 2 disposed inside this spherical hollow body 2.
] 3V and a spherical body 4 which is pivotally supported so that it can freely rotate in reverse.

Both side portions of the single spherical hollow body 20 are connected to a fluid input pipe 5 and a fluid output pipe 6, respectively, to allow fluid to flow therethrough.

Furthermore, pressure sensors 7 and 8 are provided at two points on the inner surface of the spherical hollow body 2 that are directly adjacent to the shaft 3 that supports the rotating body 4 and that are perpendicular to the fluid input and output pipes. The output terminal is led out to the outside. 9μ Pressure sensor 7. Connomitor which calculates the output signal difference of 8, converts the output 1g of lOμ comparator 9 into an all-digital signal, and supplies analog/digital conversion circuit to the microcomputer 11. The latch control signal generated from the port P3 is generated by the latch control signal generated from the port P3. A latch circuit that latches the calculation output, 13'
This is a latch circuit that latches the calculation output generated from the output capo Ps in response to the latch control signal generated from the output port P2 of the ri microcomputer 11.

In the fluid inertial sensor configured in this way, when a somewhat pressurized flow l/Ii: is supplied to the fluid input pipe 5, this fluid μ arrow moves along the circumferential surface of the spherical body 4 along the spherical body 4. After the driftwood flows, it is discharged from the driftwood output pipe 6. In this case, the fluid flowing through the upper and lower parts of the 'ri1 spherical body flows symmetrically around the spherical body 4 having a large inertia coefficient, creating a steady fluid, so that the 1 spherical body 4 continues to be in a fixed state. It is also assumed that it can be offset so that it takes a fixed state.

In this case, since the flow of fluid in the upper and lower parts of one spherical body 4 is symmetrical, the output of the pressure sensor 7.8 becomes straddle, and the output of the comparator 9 becomes zero.

Next, when the thread to which this fluid inertial sensor 1 is attached, for example, an automatic thread, rotates in the direction V indicated by the arrow, the fluid input/output pipe 5.6 and the spherical hollow body 2 rotate, but the shaft 3 A spherical body 4 with a large inertia factor rotatably supported by
will remain fixed. This makes it inconvenient to fix the thread and rotate the spherical body 4 in the opposite direction to A. As a result, in the upper part of the spherical body 4.

Relative movements in opposite directions act between the fluid flow and the surface of the spherical body 4, and relative movements in the same direction act at the bottom. Therefore, the flow velocity of the fluid between the upper and lower parts of the spherical body 4 becomes unbalanced, resulting in a pressure difference. and.

This pressure difference is detected by pressure sensor 7.8.
Since the converter ξlator iC is supplied, the converter 9 generates an analog output t'L at a level corresponding to the rotational speed Li.

The events that occurred in this way - evening 9 (7)
141 Force signal is an analog/digital variable 14610
After being changed directly to digital 1, Vc is supplied to the microcomputer 11. When the microcomputer 11 receives an input signal rL, it generates an angular velocity signal corresponding to this input signal from the output port Pl. The signal is generated from the output port P3 in accordance with the latch control signal and latched into the latch circuit 12.

Actually, this latch circuit 12 outputs one angular velocity word B. Also, this microcomputer 11? j: The rotation angle is calculated by integrating the human input signal r over time, and the output signal is baud) Pg is generated from the output boat P3 in synchronization with the latch control Il IH. As a result, the signal is latched by the latch circuit 13. As a result, the latch circuit 13 will generate the rotation angle signal C.

In the above embodiment, a case has been described in which the angular velocity signal and rotation angle signal are generated by performing arithmetic processing using a microcomputer. However, if only the angular velocity signal is required, a controller may be used. It is sufficient to use only 9.

In addition to the above-described liquid inertial sensor according to the present invention, there is one
By arranging a spherical body with a large inertia effect that is rotatably supported inside a spherical hollow body and allowing fluid to flow, the disturbance in the fluid flow velocity that occurs due to the rotation of the spherical hollow body is expressed as a pressure difference f. Since the VC1 structure is made by broiling, the structure of the VC1 can be simplified and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a main part of an embodiment of a fluid inertial sensor according to the present invention. l... Fluid inertial sensor, 2... Spherical hollow body, 3...
... Axis, 4... Spherical body, 5... Fluid man-powered tube, 6...
・Fluid output IF, 7, 8...Pressure sensor, 9・
...Kononoreta, 10...analog/digital change i11! ! equipment, 11...microcomputer,
12.13...Latch circuit.

Claims (1)

[Claims] (1) A spherical hollow body provided in a part of the fluid passage, a spherical body with high inertial efficiency rotatably supported inside the spherical hollow body, and a spherical body provided on the inner surface of the spherical hollow body. An angular velocity signal and a rotation angle signal are obtained from the pressure sensors and the pressure sensors installed directly in the axial direction that supports the body and at two points orthogonal to the human output direction of the fluid. A fluid inertial sensor characterized by obtaining.