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Vibrators vibratory gyroscopes a method of detecting a turning angular rate and a linear accelerometer
| Details |
Inventors: Kikuchi, Takayuki; Gouji, Shosaku; Osugi, Yukihisa; Soma, Takao;
Assignee: NGK Insulators, Ltd. (Nagoya, JP)
Primary Examiner: Moller; Richard A.
Assistant Examiner:
Attorney, Agent or Firm: Burr & Brown
A vibrator including a loop-shaped vibration system 2, another vibration system 3A, 5A and 5B vibrating independently from the system 2, and connecting portions 4A and 4B. Exciting means for exciting driving vibration in the vibrator is provided in one of the loop-shaped vibration system and another vibration system, and detecting means for detecting detection vibration induced in the vibrator, when it is turned, is provided in the other of the systems, to provide a vibratory gyroscope. |
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DETAILED DESCRIPTION However, such a vibrator does not necessarily have sufficiently high sensitivity.
Moreover, noise, inevitably induced by the driving vibration, tends to impede the necessary detection vibration.
As a result, the contribution of the amplitude of the detection vibration is accurately separated from all the detection signal including the noise only with great difficulty.
Such difficulty of separation also lowers the sensitivity and the signal/noise ratio.
The inventors are studying various applications of vibratory gyroscopes, and, for example, have tried to use a vibratory gyroscope as a turning rate sensor used in a automobile body control system applying a turning rate feedback method.
Such a system detects the direction of a steering wheel itself by a turning angle of the steering wheel.
At the same time, the system detects a turning rate of the actually turning car body by means of a vibratory gyroscope.
The system then finds a difference between the direction of the steering wheel and the actual body turning rate by comparing them with each other, and attains stable body control by compensating a wheel torque and a steering angle on the basis of this difference.
However, most conventional piezoelectric vibratory gyroscopes can detect a turning angular rate only when the vibrator is arranged in parallel with the axis of turning (what is called "vertical arrangement").
The turning axis of a turning system to be measured is usually perpendicular to the gyroscope mounting part.
Accordingly, when mounting such a gyroscope, it has been impossible to shorten the gyroscope in height, namely, to reduce the gyroscope in size in the direction of the turning axis.
An object of the invention is to provide a vibratory gyroscope and vibrator having a high sensitivity and signal/noise ratio and based on a novel principle.
The invention provides a vibrator comprising a primary loop-shaped vibration system, another vibration system vibrating independently from the loop-shaped vibration system, and a connecting portion connecting the loop-shaped vibration system and another vibration system
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Communications 
