CN113759160A - Method for improving analog acquisition precision - Google Patents
Method for improving analog acquisition precision Download PDFInfo
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- CN113759160A CN113759160A CN202010527939.9A CN202010527939A CN113759160A CN 113759160 A CN113759160 A CN 113759160A CN 202010527939 A CN202010527939 A CN 202010527939A CN 113759160 A CN113759160 A CN 113759160A
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- vcc
- voltage
- correction coefficient
- acquisition
- correction
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
The invention aims to provide a method for improving the analog acquisition precision, which is used for acquiring analog signals of an external sensor by an ECU (electronic control Unit) working chamber and solving the problem of signal deviation possibly existing in correction; the method comprises the following steps: s1, distributing a pin resource of the single chip microcomputer, and carrying out AD acquisition on VCC voltage; s2, calculating the ratio of VCC voltage to 5V, wherein the ratio is a correction coefficient a; s3, superimposing the correction coefficient on the signal collected by the sensor for correction; s4: correcting VCC, collecting voltage U1 generated by VCC through a voltage dividing circuit by a single chip microcomputer, and calculating the voltage dividing circuit to obtain VCC to obtain a correction coefficient; the invention has the beneficial effects that: the accuracy of signal acquisition is improved.
Description
Technical Field
The invention belongs to the technical field of electronic signal acquisition, and particularly relates to a method for improving analog acquisition precision.
Background
In electronic design, different dc voltages are often needed to supply power to different devices, and the most widely used method is to obtain different dc voltage outputs through a LDO voltage regulator chip, because the LDO has low cost and good performance, and is simple to use. Since the LDO output accuracy is ± 2%, if the output voltage is 5V, there is an error of ± 100mV, which is obviously a large error.
When the ECU works, analog signals of an external sensor need to be acquired, for example, the acquisition of the analog signals of a general pressure type is that a pull-up resistor with a proper resistance value is pulled up to a power supply VCC (VCC standard state is 5V power supply), and a singlechip reads an acquired voltage value after voltage division to calculate to obtain the resistance value of the sensor. When VCC has deviation and deviates from 5V, the calculated voltage of the sensor is inaccurate, and the accuracy of signal acquisition is influenced.
Disclosure of Invention
The invention aims to provide a method for improving the analog acquisition precision, which is used for acquiring an analog signal of an external sensor in an ECU (electronic control unit) working chamber and solving the problem of correcting possible signal deviation.
The invention provides a method for improving the precision of analog acquisition, which comprises the following steps:
s1, distributing a pin resource of the single chip microcomputer, and carrying out AD acquisition on VCC voltage;
s2, calculating the ratio of VCC voltage to 5V, wherein the ratio is a correction coefficient a;
s3, superimposing the correction coefficient on the signal collected by the sensor for correction;
s4: and correcting the VCC, collecting the voltage U1 generated by the VCC through the voltage division circuit by a single chip microcomputer, and calculating the voltage division circuit to obtain the VCC so as to obtain a correction coefficient.
The invention has the beneficial effects that: the accuracy of signal acquisition is improved.
Drawings
FIG. 1 is a schematic diagram of a signal correction process according to the present invention.
Detailed Description
The present invention will now be described in detail with reference to the drawings, which are given by way of illustration and explanation only and should not be construed to limit the scope of the present invention in any way.
The invention provides a method for improving the precision of analog acquisition, which comprises the following steps:
s1, distributing a pin resource of the single chip microcomputer, and carrying out AD acquisition on VCC voltage;
s2, calculating the ratio of VCC voltage to 5V, wherein the ratio is a correction coefficient a;
s3, superimposing the correction coefficient on the signal collected by the sensor for correction;
s4: and correcting the VCC, collecting the voltage U1 generated by the VCC through the voltage division circuit by a single chip microcomputer, and calculating the voltage division circuit to obtain the VCC so as to obtain a correction coefficient.
And (4) adding the correction coefficient into the original formula for calculation, namely. Signals are collected for accurate sensors.
Under the condition of not revising VCC, the sensor signal of gathering, wherein VCC is 5V, if VCC supply voltage appears the deviation, then the accuracy of signal acquisition is directly influenced. VCC is corrected as follows.
It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (1)
1. A method for improving the precision of analog acquisition comprises the following steps:
s1, distributing a pin resource of the single chip microcomputer, and carrying out AD acquisition on VCC voltage;
s2, calculating the ratio of VCC voltage to 5V, wherein the ratio is a correction coefficient a;
s3, superimposing the correction coefficient on the signal collected by the sensor for correction;
s4: and correcting the VCC, collecting the voltage U1 generated by the VCC through the voltage division circuit by a single chip microcomputer, and calculating the voltage division circuit to obtain the VCC so as to obtain a correction coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010527939.9A CN113759160A (en) | 2020-06-11 | 2020-06-11 | Method for improving analog acquisition precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010527939.9A CN113759160A (en) | 2020-06-11 | 2020-06-11 | Method for improving analog acquisition precision |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113759160A true CN113759160A (en) | 2021-12-07 |
Family
ID=78785465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010527939.9A Pending CN113759160A (en) | 2020-06-11 | 2020-06-11 | Method for improving analog acquisition precision |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113759160A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604984A (en) * | 2013-11-28 | 2014-02-26 | 湖北三江航天红峰控制有限公司 | Method for improving AD acquisition accuracy based on least square method |
| CN111240251A (en) * | 2020-03-24 | 2020-06-05 | 一巨自动化装备（上海）有限公司 | High-precision AD sampling correction method based on MCU |
-
2020
- 2020-06-11 CN CN202010527939.9A patent/CN113759160A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604984A (en) * | 2013-11-28 | 2014-02-26 | 湖北三江航天红峰控制有限公司 | Method for improving AD acquisition accuracy based on least square method |
| CN111240251A (en) * | 2020-03-24 | 2020-06-05 | 一巨自动化装备（上海）有限公司 | High-precision AD sampling correction method based on MCU |
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