JPS5882165A - Gas rate sensor - Google Patents

Abstract

PURPOSE:To enable the detection of an angular velocity generated in each of a plurality of planes by arranging at least two couples of thermosensitive elements in one sensor. CONSTITUTION:A sensor 8 for sensing a gas flow is provided at the position facing a nozzle hole 5a in a holder 7. The sensor 8 is made up of two couples of thermosensitive elements arrayed at a specified positions and intervals. In the normal case, the gas flow is injected from the nozzle 5a and passes through the center position corresponding to the axis part of an internal passage 15 leading to a through hole 7a. In an abnormal case where an angular velocity is applied to a gas rate sensor from outside, the gas flow in the internal passage 15 is diviated from the center position. This produces a fine difference in the output between the two couples of thermosensitive elements, which enables the detection of an angular velocity generated in the gas rate sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gas rate sensor capable of detecting a deviation in the flow direction of a gas flow using an output value related to a temperature difference between a pair of temperature sensing elements, and thereby detecting an angular velocity generated in the sensor. The present invention relates to a gas rate sensor that is capable of detecting angular velocities in a plurality of directions by providing at least two pairs of the temperature sensing elements.

To give an overview of the structure 1 and function of an angular velocity sensor called a gas rate sensor, a gas flow is caused to flow toward a pair of temperature sensing elements from a predetermined nozzle within a generally sealed sensor case. Normally, the gas flow is made to exist at a predetermined center position, and when angular acceleration occurs to the sensor, the gas flow deviates from the center position in a certain direction, approaching one of the pair of temperature sensing elements and leaving the other. Since the current flows away from each other, the output value of each temperature sensing element changes, and the function is to detect the angular velocity based on the state of change in the output value. By utilizing the functions of such a gas rate sensor, it can be used as a gyro, etc.
Compared to gyrocompasses, gas rate sensors are vibration resistant, highly sensitive, and have excellent responsiveness, so they are currently widely used as sensors for devices such as course adjustment and attitude control in ships and automobiles. .

However, with conventional gas rate sensors,
As shown in the figure, a pair of temperature sensing elements 40.5 are placed on the X axis.
Since only the temperature sensing parts 40a and 50a of 0 are arranged so that they are parallel to each other, only the angular velocity that occurs around the Y axis can be detected.For example, when angular acceleration occurs around the X axis, A problem arises in that the angular velocity related to this angular acceleration cannot be detected. Of course, if a plurality of gas rate sensors are combined, it is possible to detect the angular velocity generated in the above state, but in this case, the problem arises that the cost of the sensors increases.

The present inventor has devised the present invention in order to effectively solve the above problem, and the purpose of the present invention is to:
By providing at least two pairs of temperature-sensitive elements inside the sensor, it is possible to detect the angular velocity occurring in each of multiple planes, thereby expanding its range of applications and reducing usage costs. Our aim is to provide a gas rate sensor that reduces gas rate and improves its utility value.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

First, an overview of the overall structure of a gas rate sensor, which is the basis of the present invention, will be explained with reference to FIG. A sensor main body 2 is inserted into a sensor case 1, and in front of this sensor main body 2,
The rear end is sealed by end plates 3 and 4. A nozzle piece 5 having a nozzle hole 5a and a rectifying hole 5b is formed at one end of the sensor body 2, and a holder 6 is formed at the other end.
It is fixed to the sensor case 1 via. The holder 7 is fitted into the sensor body 2 closer to the holder 6.

A sensor 8 for sensing the gas flow is disposed in the holder 7 at a position facing the nozzle hole 5a. Details of the arrangement positions of the temperature sensing elements related to the sensor 8 will be described later. .

A pump chamber 9 is formed between the holder 6 and the end plate 4, and a piezo plate 10 having an orifice 10a is housed in the pump chamber 9. The piezo plate 10 is configured to vibrate in response to an electric signal supplied through the terminal 1'1, and operates to compress the gas in the pump chamber 9 due to the pumping action caused by this vibration. A gas flow passage 12 is formed in the axial direction between the sensor case 1 and the sensor body 2, and one end of the gas flow passage 12 is connected to a flow passage 13. The holder 6 is connected to the pump chamber 10 through the discharge hole 6a, and the other end is connected to the nozzle hole 5a and the rectification hole 5b through the flow path 14, respectively.

In the above configuration, when the vinyl 410 is energized and vibrates, the gas on the left side of the piezo plate 10 in the pump chamber 9 is compressed, and the gas on the left side of the piezo plate 10 is compressed.
0a and the discharge hole 6a of the holder 6, it flows in the flow path 12 in the axial direction and reaches the flow path 14. The gas in the flow path 14 is ejected from the nozzle hole 5a into the inner flow path 15- toward the sensor 8.

Next, it passes through the through hole 7a of the holder 7 and the exhaust chamber 16, and is returned to the left side portion of the piezo plate 10 of the pump chamber 9 through the orifice 10a by displacement of the piezo plate 10 of the pump chamber 9 to the right.

The configuration of the sensor 8 provided on the holder 7 will be explained with reference to FIGS. 2 and 3. The sensor 8 is composed of two pairs of temperature sensing elements. The temperature sensing elements 8a and 8b, and 8a' and 8b' are each a pair. As shown in FIG. 2, the temperature sensing element 8a has both ends abutted on the tips of two studs 8a-1 and 8a-2, which are vertically inserted and fixed into the holder 7 at a predetermined interval. The two are connected and fixed by a temperature sensing section 88-3. Other temperature sensing elements 8 b, la
', 8'b' are formed in the same manner, and the paired temperature sensing elements 8a and 8b, 8a' and 8b' are arranged so that their respective temperature sensing parts are parallel to each other.

In the above case, normally, the gas flow is ejected from the nozzle hole 5a and flows at the center position where it is in contact with the shaft portion of the inner flow path 15 leading to the through hole 7a, and is angled toward the gas rate sensor from the outside. In an unusual case where acceleration is applied, it is possible to detect the angular velocity that occurs in the gas rate sensor because the gas flow force in the inner flow path 15 deviates from the center position.

In the above, when angular acceleration is applied around the Y-axis, the gas flow drifts within the z-x plane, and the angular velocity is detected by the pair of temperature sensing elements 8a and -8b. Furthermore, when angular acceleration is applied around the X-axis, the gas flow is deflected within the Z-Y plane, and the angular velocity is detected by the pair of temperature sensing elements 8a' and 8b'. Also X
The angular acceleration generated around the intermediate axis X' between the axis and the Y axis can be similarly detected.

As described above, according to the gas rate sensor according to the present invention,
It is possible to detect the angular velocity of both the X-axis and the Y-axis according to the angular acceleration generated around the Y-axis,
This constitutes a so-called two-axis gas rate sensor. Further, if the present invention is further developed, it is also possible to construct a multi-axis girth rate sensor by further attaching a temperature sensing element in consideration of the above-mentioned positional relationship.
The present invention is not limited to the above embodiments.

As is clear from the above explanation, according to the present invention, the following effects can be achieved.〇 The so-called uniaxial gas rate sensor can be realized with approximately the same size and cost as a gas rate sensor having a pair of temperature sensing elements. It is extremely small and inexpensive compared to using two gas rate sensors. In a two-axis gas rate sensor, an amplifier circuit is provided for each pair of temperature sensing elements, so the circuitry increases slightly.
Other than that, it is the same as a single-axis gas rate sensor, so it has the advantage that there are fewer adjustment points in the circuit compared to when two single-axis gas rate sensors are used. When using a thermosensor individually, it is difficult to assemble and adjust the orthogonality of the thermosensor, and a separate jig is also required. Such adjustments are not specially required and are extremely simple to handle and use. In addition, the angular velocity that can be detected can be expanded to include not only one plane but also multiple planes, which expands the range of applications of the Gaslade sensor itself.
As a result, the utility value has improved. For example, it can be used as a gyro that can accurately detect the rotation angle of a vehicle such as a motorcycle, which has the characteristic of changing direction in a banked state.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional side view of a gas rate sensor, Fig. 2 is an enlarged view of the sensor section in Fig. 1, and Fig. 3 is an enlarged view of the sensor section in Fig. 2. 4 is a view similar to FIG. 2 of the conventional sensor section, and FIG. 5 is a view similar to FIG. 3 of the conventional sensor section.0 In the drawings, 1 indicates a case; 2 is the sensor body, 8 is the sensor,
9a, 8b, 8a', 8b' are temperature sensing elements. Patent Applicant Honda Motor Co., Ltd. Stanley Electric Co., Ltd. Representative Patent Attorney 2 1) Toyo Parts Co., Ltd. Patent Attorney Ohashi
Kunihiko

Claims (1)

[Claims] Gas flows from one end of the sensor body to the other end in the sensor body housed in the case, and a pair of temperature sensing elements are provided at the other end, so that when angular acceleration is applied to the case from the outside, the gas flow In the gas rate sensor that detects the angular velocity related to the angular acceleration based on the difference in the output value of the pair of temperature sensing elements based on the deviation of , at least two pairs of the temperature sensing elements are provided. Characteristic gas rate sensor.