CN114184993A - Data acquisition method with synchronous self-calibration - Google Patents
Data acquisition method with synchronous self-calibration Download PDFInfo
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- CN114184993A CN114184993A CN202111317249.1A CN202111317249A CN114184993A CN 114184993 A CN114184993 A CN 114184993A CN 202111317249 A CN202111317249 A CN 202111317249A CN 114184993 A CN114184993 A CN 114184993A
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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
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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
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
Abstract
The invention relates to a data acquisition device with synchronous self-calibration, which comprises a voltage signal acquisition circuit or a resistance signal acquisition circuit, wherein the output ends of the two acquisition circuits are respectively connected with an IO interface of a controller, the data acquisition device also comprises a diode D1/D2, the anode of the diode D1/D2 is connected with a connection node between the acquisition circuits and the controller, and the cathode of the diode D1/D2 is connected with 5V reference voltage; and the controller converts the voltage value received by the IO interface into a corresponding target object state value through the corrected voltage value-target object state value corresponding relation and displays the corresponding target object state value. The diode is added on the data output node of the acquisition circuit, so that the output voltage clamping protection of the acquisition circuit is realized, and the data drift caused by the power supply voltage fluctuation due to the complex working condition is reduced. Meanwhile, the corresponding relation between the voltage value and the target object state value is corrected, so that the data is closer to a real value and more accords with an actual scene.
Description
Technical Field
The invention relates to the technical field of automobile instruments, in particular to a data acquisition device with synchronous self-calibration and a method thereof.
Background
The vehicle data acquisition generally includes converting the current state of the target object into a corresponding voltage value or resistance value, and comparing the voltage value or resistance value with a reference standard, so as to obtain data display of the current state of the target object.
The collection of vehicle data is generally periodic, and the output voltage of a vehicle body power supply fluctuates due to the complexity of the vehicle running state, and the fluctuation of the power supply further causes data drift, so that the data collection is asynchronous with a reference standard, and the periodically collected data is deviated.
Meanwhile, because the data calculation is carried out by means of a linear interval of preset parameters, the accuracy depends on the number of partitions, and the more partitions and the thinner partitions are, the more accurate partitions are, while in practical application, unlimited partitions cannot be realized due to condition limitation, and generally 5-10 linear intervals are obtained. Within a certain linear interval, the collected voltage value and the current state value of the target object are considered to be linearly related. However, the acquired data may deviate due to the fluctuation of the power supply, so that the acquired voltage value and the current state value of the target object are not completely linearly related, and the display data and the current state value of the target object deviate.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a data acquisition device with synchronous self-calibration.
The technical scheme for solving the technical problems is as follows: a data acquisition device with synchronous self-calibration comprises a voltage signal acquisition circuit or a resistance signal acquisition circuit, wherein the output ends of the two acquisition circuits are respectively connected with an IO interface of a controller, the data acquisition device also comprises a diode D1/D2, the anode of the diode D1/D2 is connected with a connection node between the acquisition circuits and the controller, and the cathode of the diode D1/D2 is connected with 5V reference voltage; the controller converts the voltage value received by the IO interface into a corresponding target object state value through the corrected voltage value-target object state value corresponding relation and displays the corresponding target object state value;
the method for acquiring the corresponding relation between the corrected voltage value and the target object state value comprises the following steps:
acquiring display interval range endpoints of the target object state value and theoretical corresponding relations between voltage values on the endpoints and the target object state value;
establishing a rectangular coordinate system, drawing the end points of the range of the display interval in the coordinate system by taking the voltage value as x and the state value of the target object as y, and calculating the slope k of a connecting line L between the end points;
testing under various working conditions to obtain voltage values x 'corresponding to different target object state values y' between endpoints of a display interval range, drawing points (x ', y') in a rectangular coordinate system, and respectively selecting two points P1 and P2 with the maximum upper and lower distances L of a line segment L;
parallel lines L1 and L2 of the line segment L are drawn by the slope k through P1 and P2, and a central line L3 of L1L2 is obtained; and replacing L with L3 to obtain the corrected voltage value-target object state value corresponding relation.
Further, the voltage signal acquisition circuit comprises a resistor R2, a resistor R4, a capacitor C1 and a diode D1;
the resistor R2 is connected with one end of the resistor R4 in common, the common node of the resistor R2 is used as the input end of the voltage signal acquisition circuit to be connected with the voltage signal output of a target object, the other end of the resistor R2 is connected with one end of the capacitor C1, the other ends of the resistor R4 and the capacitor C1 are grounded GND, and the common node of the resistor R2 and the capacitor C1 is used as the output end of a voltage signal acquisition circuit to be connected with the IO interface of the controller;
the anode of the diode D1 is connected to the common node of the resistor R2 and the capacitor C1, and the cathode of the diode D1 is connected to a 5V reference voltage.
Further, the resistance signal acquisition circuit comprises a resistor R1, a resistor R3, a capacitor C2 and a diode D2;
one end of a resistor R1 and one end of a resistor R3 are connected in common, a common node of the resistor R1 and the resistor R3 is used as an input end of a resistor signal acquisition circuit to be connected with the resistor signal output of a target object, the other end of the resistor R1 is connected with reference voltage, the resistor R3 is connected with one end of a capacitor C2, a common node of a resistor R3 and a capacitor C2 is used as an output end of a resistor signal acquisition circuit to be connected with an IO interface of a controller, and the other end of the capacitor C2 is grounded GND;
the anode of the diode D2 is connected to the common node of the resistor R3 and the capacitor C2, and the cathode of the diode D2 is connected to a 5V reference voltage.
The invention has the beneficial effects that: the diode is added on the data output node of the acquisition circuit, so that the output voltage clamping protection of the acquisition circuit is realized, and the data drift caused by the power supply voltage fluctuation due to the complex working condition is reduced. Meanwhile, according to experimental data under various working conditions, the corresponding relation between the voltage value and the target object state value is corrected, so that the data is closer to a true value and more accords with actual situations.
Drawings
FIG. 1 is a schematic structural diagram of a data acquisition device with synchronous self-calibration according to the present invention, wherein (a) is a voltage signal acquisition circuit, and (b) is a resistance signal acquisition circuit;
fig. 2 is a flowchart of a method for acquiring a corrected voltage value-target object state value correspondence relationship according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
An embodiment of the present invention provides a data acquisition device with synchronous self-calibration, which includes a voltage signal acquisition circuit as shown in fig. 1(a), or a resistance signal acquisition circuit as shown in fig. 1 (b). No matter the voltage signal acquisition circuit or the resistance signal acquisition circuit, the final output of the voltage signal acquisition circuit or the resistance signal acquisition circuit to the controller is a voltage signal. For example, in a float type oil quantity sensor commonly used in an automobile, the principle is that an oil float drives a winding type sliding resistor, and the change of the sliding resistor resistance is caused by the height of an oil level.
The output ends of the two acquisition circuits are respectively connected with an IO interface of the controller, the controller further comprises a diode D1/D2, the anode of the diode D1/D2 is connected with a connection node between the acquisition circuits and the controller, and the cathode of the diode D1/D2 is connected with 5V reference voltage; and the controller converts the voltage value received by the IO interface into a corresponding target object state value through the corrected voltage value-target object state value corresponding relation and displays the corresponding target object state value.
Specifically, the voltage signal acquisition circuit comprises a resistor R2, a resistor R4, a capacitor C1 and a diode D1;
the resistor R2 is connected with one end of the resistor R4 in common, the common node of the resistor R2 is used as the input end of the voltage signal acquisition circuit to be connected with the voltage signal output of a target object, the other end of the resistor R2 is connected with one end of the capacitor C1, the other ends of the resistor R4 and the capacitor C1 are grounded GND, and the common node of the resistor R2 and the capacitor C1 is used as the output end of a voltage signal acquisition circuit to be connected with the IO interface of the controller;
the anode of the diode D1 is connected to the common node of the resistor R2 and the capacitor C1, and the cathode of the diode D1 is connected to a 5V reference voltage.
Specifically, the resistance signal acquisition circuit comprises a resistor R1, a resistor R3, a capacitor C2 and a diode D2;
one end of a resistor R1 and one end of a resistor R3 are connected in common, a common node of the resistor R1 and the resistor R3 is used as an input end of a resistor signal acquisition circuit to be connected with the resistor signal output of a target object, the other end of the resistor R1 is connected with reference voltage, the resistor R3 is connected with one end of a capacitor C2, a common node of a resistor R3 and a capacitor C2 is used as an output end of a resistor signal acquisition circuit to be connected with an IO interface of a controller, and the other end of the capacitor C2 is grounded GND;
the anode of the diode D2 is connected to the common node of the resistor R3 and the capacitor C2, and the cathode of the diode D2 is connected to a 5V reference voltage.
By the hardware method, the diode is added at the data node of the acquisition circuit to realize the output voltage clamping protection of the acquisition circuit, so that the data drift caused by the power supply voltage fluctuation caused by the complex working condition is reduced.
The method for obtaining the corresponding relationship between the corrected voltage value and the target object state value, as shown in fig. 2, includes:
acquiring display interval range endpoints of the target object state value and theoretical corresponding relations between voltage values on the endpoints and the target object state value;
establishing a rectangular coordinate system, drawing the end points of the range of the display interval in the coordinate system by taking the voltage value as x and the state value of the target object as y, and calculating the slope k of a connecting line L between the end points;
testing under various working conditions to obtain voltage values x 'corresponding to different target object state values y' between endpoints of a display interval range, drawing points (x ', y') in a rectangular coordinate system, and respectively selecting two points P1 and P2 with the maximum upper and lower distances L of a line segment L;
parallel lines L1 and L2 of the line segment L are drawn by the slope k through P1 and P2, and a central line L3 of L1L2 is obtained; and replacing L with L3 to obtain the corrected voltage value-target object state value corresponding relation.
According to experimental data under various working conditions, the corresponding relation between the voltage value and the target object state value is corrected, so that the data is closer to a true value and more accords with actual situations.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A data acquisition device with synchronous self-calibration comprises a voltage signal acquisition circuit or a resistance signal acquisition circuit, wherein the output ends of the two acquisition circuits are respectively connected with an IO interface of a controller, and the data acquisition device is characterized by further comprising a diode D1/D2, the anode of the diode D1/D2 is connected with a connection node between the acquisition circuits and the controller, and the cathode of the diode D1/D2 is connected with 5V reference voltage; the controller converts the voltage value received by the IO interface into a corresponding target object state value through the corrected voltage value-target object state value corresponding relation and displays the corresponding target object state value;
the method for acquiring the corresponding relation between the corrected voltage value and the target object state value comprises the following steps:
acquiring display interval range endpoints of the target object state value and theoretical corresponding relations between voltage values on the endpoints and the target object state value;
establishing a rectangular coordinate system, drawing the end points of the range of the display interval in the coordinate system by taking the voltage value as x and the state value of the target object as y, and calculating the slope k of a connecting line L between the end points;
testing under various working conditions to obtain voltage values x 'corresponding to different target object state values y' between endpoints of a display interval range, drawing points (x ', y') in a rectangular coordinate system, and respectively selecting two points P1 and P2 with the maximum upper and lower distances L of a line segment L;
parallel lines L1 and L2 of the line segment L are drawn by the slope k through P1 and P2, and a central line L3 of L1L2 is obtained; and replacing L with L3 to obtain the corrected voltage value-target object state value corresponding relation.
2. The data acquisition device with synchronous self-calibration according to claim 1, wherein the voltage signal acquisition circuit comprises a resistor R2, a resistor R4, a capacitor C1 and a diode D1;
the resistor R2 is connected with one end of the resistor R4 in common, the common node of the resistor R2 is used as the input end of the voltage signal acquisition circuit to be connected with the voltage signal output of a target object, the other end of the resistor R2 is connected with one end of the capacitor C1, the other ends of the resistor R4 and the capacitor C1 are grounded GND, and the common node of the resistor R2 and the capacitor C1 is used as the output end of a voltage signal acquisition circuit to be connected with the IO interface of the controller;
the anode of the diode D1 is connected to the common node of the resistor R2 and the capacitor C1, and the cathode of the diode D1 is connected to a 5V reference voltage.
3. The data acquisition device with synchronous self-calibration according to claim 1, wherein the resistance signal acquisition circuit comprises a resistor R1, a resistor R3, a capacitor C2 and a diode D2;
one end of a resistor R1 and one end of a resistor R3 are connected in common, a common node of the resistor R1 and the resistor R3 is used as an input end of a resistor signal acquisition circuit to be connected with the resistor signal output of a target object, the other end of the resistor R1 is connected with reference voltage, the resistor R3 is connected with one end of a capacitor C2, a common node of a resistor R3 and a capacitor C2 is used as an output end of a resistor signal acquisition circuit to be connected with an IO interface of a controller, and the other end of the capacitor C2 is grounded GND;
the anode of the diode D2 is connected to the common node of the resistor R3 and the capacitor C2, and the cathode of the diode D2 is connected to a 5V reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111317249.1A CN114184993A (en) | 2021-11-09 | 2021-11-09 | Data acquisition method with synchronous self-calibration |
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| CN202111317249.1A CN114184993A (en) | 2021-11-09 | 2021-11-09 | Data acquisition method with synchronous self-calibration |
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