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Online checking method and device for position sensor

A calibration method and sensor technology, applied in measuring devices, electrical devices, instruments, etc., can solve problems such as deviation, affecting the normal operation of vehicles, and inability to calibrate position sensors.

Active Publication Date: 2013-10-02
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when the car is running, the control system can no longer force the actuator to fully open or close the valve, otherwise it will affect the normal operation of the vehicle. At this time, the characteristic curve of the EGR position sensor may deviate due to aging problems, resulting in large error
In addition to this, existing technology relies on forcing devices like actuators, however not all position sensors have a forcing device and without a forcing device the position sensor cannot be calibrated

Method used

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  • Online checking method and device for position sensor
  • Online checking method and device for position sensor

Examples

Experimental program
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Embodiment 1

[0040] Due to assembly errors or aging problems, the characteristic curves of some position sensors deviate during the operation of the machine, and even the characteristic curves have deviations before the operation, which reduces the accuracy of the sensors. The invention provides an online calibration method for a position sensor, which checks the characteristic curve when the machine is running, see figure 1 , the method includes the following steps:

[0041] Step S101: Initializing the respective voltages corresponding to the first position offset and the second position offset on the characteristic curve;

[0042] Step S102: Sampling and filtering the real-time voltage output by the position sensor;

[0043] Step S103: judging whether the real-time sampling voltage remains within the first threshold range within a certain time range, if yes, proceed to step S104, otherwise return to step S102;

[0044] Step S104: judging whether the real-time sampling voltage fluctuati...

Embodiment 2

[0050] Embodiment 1 only updates the voltage corresponding to the first position offset. In practical applications, the linear curve generated by updating the voltages corresponding to the two position offsets is more accurate, so this embodiment updates the second position offset Also updated, see figure 2 ,Specific steps are as follows:

[0051] Step S201: Initialize the voltage corresponding to the first position offset on the characteristic curve and the voltage corresponding to the second position offset on the characteristic curve;

[0052] Step S202: Sampling and filtering the real-time voltage output by the position sensor;

[0053] Step S203: Determine whether the real-time sampling voltage remains within the first threshold range within a certain time range, if yes, proceed to step S204, otherwise return to step S202;

[0054] At the same time, it is judged whether the real-time sampling voltage remains within the third threshold range within the time range, if y...

Embodiment 3

[0062] In order to further understand the present invention, this embodiment describes the online verification method of the position sensor described in the second embodiment by way of example. Since the present invention does not specifically limit the first position offset and the second position offset of the position sensor, it is preferred that the first position offset is the minimum position offset, that is, relative to the initial position offset 0%, corresponding to the voltage on the original characteristic curve as u' 1 , the second position offset is the maximum position offset, that is, it is 100% offset from the initial position, and the corresponding voltage on the original characteristic curve is u' 2 . The present invention does not specifically limit the first threshold range, the second threshold range, the third threshold range, and the fourth threshold range. In this embodiment, the preferred first threshold range is [u' 1 -x%|u' 2 -u' 1 |, u' 1 +x%|...

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Abstract

The invention discloses an online checking method for a position sensor. The method comprises the steps as follows: initializing voltages corresponding to a first position offset and a second position offset in a characteristic curve, sampling a real-time voltage output by the position sensor, judging if the real-time sampled voltage in a certain time range is kept in a first threshold range, if so, judging if the voltage fluctuation amplitude in the time range is kept in a second threshold range, if so, updating the voltage corresponding to the first position offset in the characteristic curve to a real-time sampled voltage mean value in the time range, and regenerating the characteristic curve of the position sensor by the first position offset, the updated voltage corresponding to the first position offset, the second position offset and the voltage corresponding to the second position offset so as to achieve checking. According to the method, the shortcoming of non-checking in a machine running process in the prior art is overcome. The embodiment of the application further discloses an online checking device for the position sensor, and the accuracy of the position sensor is improved.

Description

technical field [0001] The invention relates to the field of automation, in particular to an online calibration method and device for a position sensor. Background technique [0002] With the advancement and development of science and technology, position sensors are becoming more and more popular in modern industrial automation production. A position sensor refers to a sensor that can sense the position of the object to be measured and convert the offset of the object's position into a measurement of resistance, capacitance, or induced electromotive force, thereby outputting a signal such as a voltage, such as a throttle position sensor, etc. The characteristic is that the relationship between the position offset measured by the position sensor and the output voltage is a certain characteristic curve, and the measurement of the position offset can be based on angle or displacement according to the specific situation. [0003] However, in practical applications, due to asse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/00
Inventor 刘兴义孔祥花武迎迎
Owner WEICHAI POWER CO LTD
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