Rotating speed or speed measuring device and detection method based on accelerometer

Abstract

The invention relates to a rotating speed or speed measuring device and a detection method based on an accelerometer. The rotating speed or speed measuring device consists of a sensing detection part arranged on a carrier and a processing display part arranged on certain fixture at the far end, wherein the sensing detection part is connected with the processing display part through wireless communication. The rotating speed or speed measuring device uses the output signals of the accelerometer to extract the rotating centripetal acceleration of the carrier, obtains the rotating speed of the carrier according to the relations between the centripetal acceleration and the rotating radius and between the centripetal acceleration and the rotating speed, or detects the periodic signals output by the accelerometer in a time domain and a frequency domain to directly obtain the rotating cycle or frequency of the carrier to further obtain the rotating speed or the speed of the carrier. The rotating speed or speed measuring device has the advantages of low cost, simple structure, wide measuring range, high resolution ratio and the like; and simultaneously the device also has the characteristics of monitoring the state of the carrier remotely and providing the functions of prompting and alarming.

Description

technical field [0001] The invention relates to the field of rotational speed or speed sensing and detection, in particular to a rotational speed or speed measuring device, and at the same time, the device has a certain prompting and alarming function. Background technique [0002] In the production process of people's daily life, rotating speed (or speed) measuring devices can be seen everywhere, such as speedometers and tachometers of automobiles, stopwatches of bicycles and tachometers of various engines. These rotational speed (or speed) measuring devices also have different ways of sensing the rotational speed (or speed). The traditional speedometer is mechanical. A typical mechanical speedometer is connected to a flexible shaft. There is a steel wire cable inside the flexible shaft. The other end of the flexible shaft is connected to a certain gear of the transmission. It drives a magnet in the cover ring of the odometer to rotate. The cover ring is connected with the...

AI Technical Summary

Problems solved by technology

[0004] Another inertial sensor - gyroscope can also be used to sense the angular rate of the carrier, but due to the high cost of the gyroscope, it is not suitable for the speed measurement in general occasions, and the dynamic range of the gyroscope is relatively small, so it is not suitable for large RPM measurement with dynamic range

So is it possible for a low-cost accelerometer to be used for tach (or speed) measurement? the answer is yes

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