SU1739297A1 - Process of metering speed of moving object - Google Patents

Abstract

Usage: measurement of the linear velocity of the object when moving it along a given trajectory. The number of sensors on the measuring section of length S vybyurat equal to (2n + 1), where ji 2,3 ..., assign them sequence numbers from 1 to (2n-M), measure the time of the object passing the measuring part of the path, determine The number of the failed K-th sensor determines the VK speed at the installation site of the failed K-th sensor from the expression V "1 / o {6nV6, + 4VЈ + 2V, + 4V4 + ..: + J5VK., + (+ {3VK + i + ... VZhtJ}, where V0 S / tJ P (2, J 4 - if the order number of the failed K-th sensor is odd, {4, | 3 2 - if the serial number of the failed K-th sensor is odd . 1 il. (L

Description

The invention relates to the measurement of motion parameters and can be used primarily to measure the speed of a linear movement of an object along a given trajectory.

A known method for measuring the speed of an object is relatively evenly distributed along the motion path of sensors that are successively disturbed by the movement of an object, in which an object is measured by an object of each sensor, a command is generated to connect the next sensor when its output signal reaches a predetermined value disturbance intensity of the previous sensor, as well as measure the intensity of the disturbance of the next g The sensor is in the interval between them, and the connection of the next sensor is made when the values of the signals of two adjacent sensors are equal.

The disadvantage of this method is low measurement reliability due to the fact that if one sensor fails to register, information about the measured parameter (velocity) of the object's motion is lost.

The closest in technical essence is a method of measuring the speed of movement using an induction sensor, which consists in measuring the time interval between two extreme values of J

WITH

with

Hche

with

mi signal EMF induction induced in the sensor.

A disadvantage of the known method is the low reliability of the speed measurement due to the fact that if the speed value of the sensor fails to register, the information is lost during the speed measurement.

The purpose of the invention is to improve the reliability of the speed measurement by providing the possibility of restoring its missed measurements.

This goal is achieved due to the fact that according to the method of measuring the speed of an object, which consists in fixing the value of velocity V at the installation site of the sensor on an area of length S, the number of sensors on this section installed along the movement path is chosen to be (2n + 1) , where n 2,3 ..., assign the sensors serial numbers from 1 to (2п + 1), measure the time t of the object of the path section of length S, determine the serial number of the failed K-th sensor and the speed V in place installation of the failed K-th sensor as

2V3 +

Vk - i (6nV0, + 4VZ +

+ 4V4 + ... + | 3VK (+ {JVk + 1 + ...- W4tM.f)

where V0 is S / tJ

oЈ 2, {A - if the order is

The number of the K-th sensor is odd od, jb 2 - if the sequence number of the K-th sensor is even.

The drawing shows a block diagram of a device that implements a method for measuring the speed of an object. .

The device contains sensors 1, threshold elements 2, a time interval meter 3, a calculator, a sensor response control unit 5, two signal delay elements 6 and 7, a unit 8 for determining the sequence number of sensors.

The outputs of sensors 1 through threshold elements 2 are connected to the information inputs of the meter 3 time intervals, the information outputs of which are connected to the information inputs of the calculator, the outputs of the threshold elements 2 are also connected to unit 5 of the control sequence of the sensors, the outputs of which

s

0

five

0

five

0

9

O

S

They are connected to the second information inputs of the calculator 1 and to the inputs of the unit 8 for determining the sequence number of the sensors, the output of which is connected to the control input of the calculator. The meter 3 time intervals through the first element 6 of the delay signal is connected to the input. gating the calculator and then through the second element 7 of the signal delay with its own, the reset input.

The sensor actuation control unit 5 can be implemented, for example, in the form of a memory register in which the sensor actuation is recorded. At the end of all measurements, the calculator polls the memory register to detect the failed sensor.

The method is implemented as follows.

With the passage of the object in front of the sensor 1, the threshold element 2 generates a pulse along the length equal to the interaction time of the object At and sensor 1. Next, the duration of this pulse is measured in the 3 time interval meter and the resulting code is fed to the input of the calculator. On the trailing edge of the measured signal, the time interval meter generates a signal, which, being delayed at the first element 6 of the delay j, prostromat the calculator to calculate the speed using the formula

v 8s vi s -Sh

where oS is the working area of the sensor (the area of its mutual action with the object). The resulting velocity value is recorded in the memory of the calculator k. After determining the speed through the time specified by the second time delay element 7, the time meter is. Intervals 3 will be reset to the measurement of time intervals from subsequent sensors t. When forming the signal at the output of the threshold element 2, this fact is recorded in block 5 of the control. With the start / trip of the first of the sensors 1 in the time interval meter, the measurement also begins of the time t the object passes the entire path of movement S "

In case the object is not registered by one of the sensors 1,

5t

 the sensor triggering control will not go to the corresponding block of the unit, and in the memory register of the unit of the sensor response unit h until the end of the speed measurement process, the fact that this sensor I did not measure the speed will be recorded. After the last sensor 1 triggers on the motion path, the measurement of the object's transit time for the entire motion path ends.

After fixing the speed from triggered sensors, the velocity value is calculated at the installation point of the non-triggered sensor using the formula

VK - (6n-V0 - v, + 4Va f2V3 + + 4V4 + ...- "jiVK, + | 3VK +, + ... +

+ Vi "J

where 2p + 1 is the number of speed measurement sensors j

 2, ft 1 - if the sensors are odd,

& - b, fb 2, if the sensor is even,

Moreover, the average speed of an object along the entire trajectory of its movement is determined by the time measured by the time interval meter in parallel with the measurement of the duration of the interaction of the object and the sensor.

39297.

Thus, in the proposed method, the speed of the object is restored as it moves, provided that it is not registered in the working area of the sensor.

Claims (1)

Formula from gaining A method for measuring the speed of an IQ engine or an object, which consists in fixing the speed value at the sensor installation site on a section of the path of length S, characterized in that, in order to improve accuracy, stability and reliability, the number of sensors installed on the section of length S along the path the object's motion is chosen equal to (2n + 1), where n 2,3, ..., is assigned to the sensors 20 sequence numbers from 1 to (2p + 1), measure the time t of the passage of an object along a path of length S, determine the sequence number of the Kth failed sensor, and the velocity V in place 25 installation of the failed K-th sensor is defined as VK 6pl - at | + et2 + 2V5 + + 4y4 + ..: V ftvk, + rtvK + (4 -... + thirty + y "fivil), where Vc s / t; 06 2, | 5 s k - if the serial number of the failed K-th 3 sensor is odd; 06 k, Ј 2 - if the serial number of the failed K-th sensor is even.