Real-time low speed detection device and method based on DSP quadrature encoding

Abstract

Provided are a real-time low speed detection device and method based on DSP quadrature encoding. The device comprises a pulse encoder, a signal conditioning circuit, a quadrature encoding module and a processor. The pulse encoder outputs difference pulse signals Ao, difference pulse signals Bo and difference pulse signals Co, the pulse signals Ao, the pulse signals Bo and the pulse signals Co, output from the pulse encoder, are input to three input ends of the quadrature encoding module respectively through the signal conditioning circuit, and the four output ends of the quadrature encoding module are respectively connected with the processor. The device and method have the advantages that by the adoption of the technical scheme, calculation of the rotating speed is faster, meanwhile interruption and a DSP internal counter are adopted in the whole calculation mode, and CPU time is not occupied; meanwhile, the mode of the rotating speed is used, so detection at a high speed, at a low speed and at an ultralow speed can be achieved at the same time, and the former method of calculation of the rotating speed can be completely replaced; in addition, the method has continuity and timeliness of calculated quantity, encapsulation of functions can be conducted, and modularized processing of software is facilitated.

Description

technical field [0001] The invention belongs to the technical field of signal detection, in particular to a real-time low-speed detection device and method based on DSP orthogonal coding. Background technique [0002] In the prior art, there are two speed measurement methods, analog circuit hardware detection and digital circuit calculation speed measurement. With the development of electronic information technology, especially the generation of DSP digital processing chips, the accuracy and range of speed detection have been greatly improved. There are also different methods for digital circuit speed measurement. The initial method is to use the peripheral analog-to-digital conversion chip to convert the analog quantity detected by the analog-digital conversion chip into a digital quantity, and then transmit the digital quantity to the CPU through the bus for calculation. . Now, with the development of chip technology, an analog-to-digital conversion chip will be integrat...

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Problems solved by technology

[0007] However, no matter it is M method, T method or M / T method, encoder pulse must be required. Encoder pulse must appear twice to calculate and extract the speed, and the speed calculation value is due to 0-1 at the moment when the second pulse appears. There are speed steps or jitters in the change, so it is impossible to quickly extract the speed

[0008] Most of today's equipment and instruments, in real-time systems that use rotational speed as closed control, must require real-time and fast calculation of rotational speed, which cannot be satisfied by existing algorithms

[0009] In addition, for most speed algorithms, only a single detection is performed on the speed signal, and the signal cannot be judged, so the speed system that has tended to be stable drifts slowly until it fails

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