Locomotive photoelectric rotation speed sensor displacement receiving method and signal acquisition device

Abstract

A locomotive photoelectric rotation speed sensor displacement receiving method and a signal acquisition device adopt a multi-hole gap and multi-tube array mode to acquire a locomotive photoelectric rotation speed sensor displacement signal. A multi-channel photoelectric displacement receiving array device is installed on a railway locomotive photoelectric rotation speed sensor, an infrared light-emitting tube is installed above the multi-channel photoelectric displacement receiving array device and transmits infrared light. A rotating optical grating coded disc is arranged between the multi-channel photoelectric displacement receiving array device and the infrared light-emitting tube, so that a light-sensing access of the multi-channel photoelectric displacement receiving array device is cut by the rotating optical grating coded disc, the light receiving end of the multi-channel photoelectric displacement receiving array device senses an intermittent optical signal according to a photoelectric rotation speed sensor signal acquisition principle under the condition that the optical grating coded disc performs intermittent cutting on the infrared light transmitted by the infrared light-emitting tube, the intermittent optical signal is converted into an electrical signal through the railway locomotive photoelectric rotation speed sensor, and an electrical signal related with the rotating frequency of a rotating body is formed after shaping.

Description

technical field [0001] The invention relates to a signal transmission method and a signal collection device, in particular to a transmission method of a speed signal of a railway locomotive and a collection device of the speed signal, belonging to the technical field of information transmission. Background technique [0002] The speed of the locomotive is an important operating parameter, which needs to be observed continuously during the operation of the locomotive. The traditional detection of the speed of the locomotive is to obtain an electrical signal from the axle through a sensor, and then send the electrical signal to the detection In the system, it is finally reflected by the tachometer. [0003] At present, the working principle of the photoelectric speed sensor mainly used for the speed test of the wheel axle of the locomotive is: the special grating sheet (a metal disc with wedge-shaped grating uniformly distributed radially and circumferentially) is coaxially in...

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Problems solved by technology

[0008] 3. The processing of the grating code disc itself has a certain processing error, which leads to the fact that the sampled signal and the output signal cannot be consistent, so it can appear that the minimum duty cycle is 45% and 52% out of this range. In the F of the locomotive microcomputer system The sampling comparison of the / V circuit will mistakenly judge that it is idling, which will cause the locomotive to automatically sprinkle sand and reduce the traction current to eliminate idling, but in fact there is no vacuum running. This is a false idling that poses a great threat to the safe operation of the locomotive (for example; locomotives When climbing a large slope with all your strength, if false idling occurs frequently, resulting in continuous deceleration, the locomotive cannot climb the large slope, resulting in a slope stop accident) and it is difficult for the grating code disc to achieve a processing accuracy error of less than 0.01, whether it is laser cutting or chemical corrosion mm, through calculation, it can be known that, for example, a code disc with a diameter of 52mm is divided into 200 holes and grids on a circular graduation line of 45mm, that is, the size of the hole; (k=45π / 400=0.35mm) when the minimum processing error is 0.01mm , then the minimum error of the duty cycle is 1.43%, (0.35 / 50=0.007mm, 0.01 / 0.007=1.43%) Since the maximum and minimum error values ​​are 2 times=2.86%, the maximum duty cycle will be 52.86 and the minimum The duty cycle is 47.14, so the industry controls the duty cycle below 50%.

[0015] Although the above-mentioned patents all relate to some detection methods or devices of locomotive speed, they lack the method to solve the problem that the test of locomotive wheel shaft speed is not very accurate. Improve

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