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Angular-rate sensor

An angular velocity sensor, velocity technology, applied in instruments, velocity/acceleration/shock measurement, navigation through velocity/acceleration measurement, etc., can solve the problem of not having

Inactive Publication Date: 2002-06-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the problem with the conventional angular velocity sensor is that there is no function to transmit the failure to the outside or judge the failure from the outside for the failure of the product generated after the sensor is activated.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] figure 1 It is a circuit diagram of the control circuit in the first embodiment of the angular velocity sensor of the present invention. The driver 15 applies a 1VP-P (peak-to-peak), 1.5KHz AC signal as a driving signal to the piezoelectric element 11a of the driving board 11 as a sensing element. As a result, the drive plates 11 and 12 begin to vibrate as a tuning fork centered on the support rod 9 in the inner and outer directions. The piezoelectric element 12a of the driving board 12 generates an induced voltage proportional to the applied signal due to the vibration of the tuning fork, and the voltage passes through the current amplifier 16 and the band-pass filter 17 to form at point A figure 2 The monitoring signal shown in A. The signal is fed back to the driver 15 through the subsequent full-wave rectifier 18 and AGC circuit 19 to perform AGC control on the driving signal. In the detection section, when the piezoelectric elements 13a and 14a detect the angu...

Embodiment 2

[0017] image 3 represents another embodiment, in which synchronous detector 30 is interposed between amplifier 25 and smoother 27, and uses the feedback signal of the feedback circuit in the drive signal, that is, from image 3 The signal at point A passing through the phaser 31 is subjected to synchronous detection. That is, since the angular velocity signal is also mixed in the mechanical coupling signal flowing into the amplifier 25, the angular velocity signal is canceled to bring the level of the mechanical coupling signal close to the correct value. For this purpose, as described above, phaser 31 is used to pair the incoming image 3 in point A Figure 4 The phase shift of medium signal A lags behind 90°, if using Figure 4 Shown in H has the output of the amplifier 25 from the synchronous detection of the signal with this 90° lagging phase, then as Figure 4 As shown in I, the angular velocity signal is eliminated, and the level of the mechanically combined signal ...

Embodiment 3

[0019] Figure 5 represents yet another embodiment in which the Figure 5 The middle point D is initially set to zero when adding the mechanical coupling signals obtained from the piezoelectric elements 13a and 14a. That is, in this example, for figure 1 , image 3 In the state where the sum is not zero, the balance of the detection board 13 or 14 is adjusted so that the sum of the mechanical combination signals generated by the piezoelectric elements 13a and 14a is initially set to zero. This situation is expressed in Figure 6 In D, the mechanical coupling signal does not appear in the normal state before a fault such as damage to the detection board 14 or a lead wire falling off occurs, for example. Figure 5 On point D. However, after this failure occurs, since the piezoelectric element 14a does not generate a mechanical coupling signal, as Figure 6 As shown in D, a mechanobinding signal appears. As a result, such as Figure 6 As shown in J, when a fault occurs, th...

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Abstract

The present invention aims to present an angular velocity sensor having a self diagnosis function. An angular velocity sensor of the present invention includes a driving part for stably vibrating a driving part of a sensor element having a driver part and a detector part for detecting an angular velocity and detection means for detecting the angular velocity of the sensor element and obtains a self diagnosis signal for a malfunction by detecting a mechanical coupling signal obtained at the detection means.

Description

[0001] This application is a divisional application with application number 96190557.3, filing date May 29, 1996 (international filing date), and titled "Angular Velocity Sensor". technical field [0002] The invention relates to an angular velocity sensor with self-checking function. Background technique [0003] For example, a tuning fork-shaped angular velocity sensor is provided with a detection plate on the front ends of the two driving plates of the tuning-fork-shaped driving part in a direction perpendicular to it. The output of the vibrating detection plate can detect the angular velocity. [0004] Prior art angular velocity sensors, such as Figure 18 As shown, a sealed space is formed by attaching a resin-made cover 2 to the opening of a resin-made case 1 that is opened at one end. [0005] A circuit board 3 and a metal weight board 4 are placed inside the sealed space. That is, support rods 5 are planted at four corners inside the box 1 , and the support rods 5 ...

Claims

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Application Information

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IPC IPC(8): G01C19/56G01C21/16G01C21/28G01P21/02G01S19/49G01S19/52G01S19/53
CPCG01C21/165G01S19/49G01S19/53G01P21/02G01S19/52G01C19/5607G01C21/28
Inventor 野添利幸植村猛田村雅已
Owner PANASONIC CORP
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