JPH03282371A - Accelerometer - Google Patents

Abstract

PURPOSE:To improve the reliability of measurement by arranging four acceleration detectors on a space axis which are off orthogonal axes and detecting acceleration in an optional direction among three dimensions by at least two detectors even if one detector becomes faulty. CONSTITUTION:The detectors 1, 2, 3, and 4 have four coordinate axes in specific directions from the origin in a three-dimensional space and are arranged having sensitivity in parallel to the respective coordinate axes by setting at least one coordinate axis not orthogonally to other coordinate axes. Then if acceleration GX is generated on, for example, an X axis, the detector 2 can detect acceleration Gxcostheta and when an angle theta is set as a known number in advance, the acceleration Gx can be calculated from the Gxcostheta of the detector 2. Other detectors 3 and 4 are the same and whichever direction the acceleration is generated in, >=2 detectors detect the acceleration without fail. Thus, even if one detector becomes faulty, high reliable measurement is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an accelerometer, and particularly to an accelerometer that can measure force u velocity values in any direction using a plurality of accelerometers.

[Conventional technology]

Conventionally, in an accelerometer that detects acceleration in a three-dimensional space, as shown in the layout explanatory diagram in Fig. 2, three axes G, X-axis, Y-axis, and Z-axis, which are orthogonal to each other, are used as accelerometers (hereinafter referred to as sensors). The three sensors are arranged at an angle of 5°6.7 and are capable of detecting acceleration in any three-dimensional direction as a whole.

[Problem to be solved by the invention]

In the conventional accelerometer mentioned above, one sensor e.g.
If the axis sensor fails, the acceleration applied in the X-axis direction cannot be measured at all.As a countermeasure against this failure, it is necessary to install two sensors on each axis and create a redundant configuration.
There is a drawback that six sensors are required in total, making the scale of the device larger than necessary.

An object of the present invention is to provide an accelerometer that can measure acceleration with reliability by including an accelerometer with a minimum redundant configuration.

[Means to solve the problem]

The accelerometer of the present invention has four coordinate axes extending in predetermined directions from the origin in a three-dimensional space, at least one of which is set so as not to be orthogonal to the other coordinate axes, and in a direction parallel to each coordinate axis. Four acceleration detectors with sensitivity are installed.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a layout explanatory diagram of an embodiment of the present invention.

The embodiment shown in FIG. 1 shows sensors 1, 2° 3.4 placed on each of four coordinate axes, x, y, z, and w, which are placed at positions off orthogonal axes in a three-dimensional space. ing. Now, assuming that acceleration GX is generated on the X-axis, sensor 1 will of course detect that acceleration, but at the same time sensors 2 and 3.4 also have a component in the X-axis direction. , respectively can be detected.0For example, if the angle formed by the X-axis and the Y-axis is θ, the sensor 2 can detect an acceleration of GxCO3θ since the acceleration in the X-axis direction is GX. If θ is set to a known value in advance, sensor 2
GX can also be known from GXCO3θ. The same applies to the other sensors 3 and 4. The above operation works in the same way no matter which direction acceleration occurs, and two or more sensors can always detect acceleration.

〔Effect of the invention〕

As explained above, the present invention enables one of the four sensors to be placed on the spatial axis off the orthogonal axis.
Even if one sensor fails, acceleration in any three-dimensional direction can be detected by at least two of the other three sensors, resulting in the ability to measure acceleration values with high reliability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the layout of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the layout of a conventional accelerometer. 1.2, 3, 4, 5, 6.7...acceleration detector, x,
y, z axes: 3 coordinate axes to be set, θ: angle. 1 prisoner

Claims (1)

[Claims] 1. A three-dimensional space has four coordinate axes extending in a predetermined direction from the origin, and at least one of the coordinate axes is set so as not to be perpendicular to the other coordinate axes, and is parallel to each coordinate axis. An accelerometer characterized by arranging four acceleration detectors having sensitivity in the directions. 2. Determine the angle between the at least one coordinate axis and the other three coordinate axes to be a known angle, and calculate the value of acceleration in any direction from the detected values of at least two acceleration detectors. The accelerometer according to claim 1, characterized in that: