CN114659545B - Double-range self-adaptive measurement method and device - Google Patents
Double-range self-adaptive measurement method and device Download PDFInfo
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- G—PHYSICS
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The application relates to a double-range self-adaptive measurement method and a device, and relates to the technical field of signal measurement, wherein the method comprises the following steps: measuring an analog signal to be measured by using a preset double-range self-adaptive measuring circuit in a first state; identifying a range identification value obtained by the dual-range adaptive measurement circuit in a first state; when the equivalent range identification value is in a first measurement range corresponding to the first state, obtaining analog signal measurement data measured by a double-range self-adaptive measurement circuit in the first state; when the equivalent range identification value is not in the first measurement range corresponding to the first state, the double-range self-adaptive measurement circuit is switched into the second state, and analog signal measurement data measured by the double-range self-adaptive measurement circuit in the second state are obtained. The double-range self-adaptive test circuit is used for adapting to different analog measurement ranges, monitoring the change of analog quantity and realizing automatic switching of measurement ranges, so that the measurement work of different measurement ranges is satisfied.
Description
Technical Field
The application relates to the technical field of signal measurement, in particular to a double-range self-adaptive measurement method and device.
Background
With the rapid propulsion of the electromotion, the intellectualization, the networking and the sharing of the automobiles, the data volume of the automobiles presents an unprecedented blowout type growth situation, and new technical requirements are put forward in the fields of data acquisition, processing, storage and the like.
In the prior art, aiming at digital quantity or switching quantity, a discrete triode circuit, an integrated acquisition chip circuit or a comparator circuit is generally adopted to convert the state, and a pull-up power supply is combined to output a determined high level and a determined low level as a measurement result and input the measurement result to a microprocessor, so that acquisition and processing of automobile digital signals are realized.
For analog quantity, a resistor voltage dividing circuit is generally adopted; if the signal is a resistance signal, the resistance voltage dividing circuit also needs a pull-up power supply to convert a certain range of analog quantity into a voltage signal with proper amplitude, and the voltage signal is input into an A/D converter or a singlechip integrated with the A/D converter to realize the acquisition of the automobile analog signal.
However, the measurement method in the prior art has the prominent problems of limited data acquisition range, low acquisition precision and the like, and cannot meet the requirements of high-precision and wide-range analog quantity acquisition.
Therefore, in order to cope with the above situation, a new dual-range adaptive measurement technique is provided.
Disclosure of Invention
The application provides a double-range self-adaptive measurement method and device, which utilize a double-range self-adaptive test circuit to adapt to different analog measurement ranges, monitor the change of analog quantity and realize automatic switching of measurement ranges so as to meet the measurement work of different measurement ranges.
In a first aspect, the present application provides a dual range adaptive measurement method, the method comprising the steps of:
receiving an analog signal to be measured, and measuring the analog signal to be measured by using a preset double-range self-adaptive measuring circuit in a first state;
identifying a range identification value obtained when the dual-range adaptive measurement circuit in the first state measures the analog signal to be measured;
when the range identification value is in a first measurement range corresponding to the first state, obtaining analog signal measurement data corresponding to the analog signal to be measured by a double-range self-adaptive measurement circuit in the first state;
and when the range identification value is not in the first measurement range corresponding to the first state, switching the dual-range self-adaptive measurement circuit into a second state, and obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the dual-range self-adaptive measurement circuit in the second state.
Further, the dual-range adaptive measurement circuit includes:
an analog signal input for receiving the analog signal to be measured;
the first capacitor is used for filtering the analog signal to be measured;
the collector of the first triode is connected with one end of a first pull-up resistor, the other end of the first pull-up resistor is connected with the first capacitor, the emitter of the first triode is connected to a preset reference voltage, the base of the first triode is connected with one end of a first current-limiting resistor, the other end of the first current-limiting resistor is connected with a preset measuring singlechip port, and the first current-limiting resistor is connected with a first pull-down resistor in series to a grounding point;
the collector of the second triode is connected with one end of a second pull-up resistor, the other end of the second pull-up resistor is connected with a preset RC filter circuit, the emitter of the second triode is connected to a reference voltage, and the base of the second triode is connected with one end of a second current-limiting resistor;
the base electrode of the third triode is connected with one end of a second current-limiting resistor, the other end of the second current-limiting resistor is connected with a port of the measuring singlechip, the collector electrode of the third triode is connected with the other end of the second current-limiting resistor, and the collector electrode of the third triode is connected to a working power supply through a third pull-up resistor;
The RC filter circuit comprises a filter circuit resistor and a filter circuit capacitor which are connected in series, wherein the other end of the filter circuit resistor is connected to the anode of the A/D converter and the anode of the first voltage stabilizing tube, and the cathode of the first voltage stabilizing tube is connected to the working power supply;
the base electrode of the second triode is connected in series with the collector electrode of the third triode through a preset resistor;
the A/D converter is used for outputting analog signal measurement data corresponding to the analog signal to be measured by the dual-range self-adaptive measurement circuit.
Further, when the dual-range self-adaptive measuring circuit is in the first state, the first triode is internally conducted, and the second triode and the third triode are internally not conducted;
when the double-range self-adaptive measuring circuit is in the second state, the first triode is not conducted, and the second triode and the third triode are conducted.
Further, the method comprises the following steps:
and receiving a power signal to be measured, measuring the power signal to be measured by using a preset voltage acquisition circuit, and obtaining corresponding power signal measurement data.
Further, the method comprises the following steps:
and receiving the digital signal to be measured, measuring the digital signal to be measured by using a preset switch acquisition circuit, and obtaining corresponding digital signal measurement data.
In a second aspect, the present application provides a dual range adaptive measurement device, the device comprising:
an analog signal receiving end for receiving an analog signal to be measured;
the double-range self-adaptive measurement module is used for measuring the analog signal to be measured;
the double-range self-adaptive identification module is used for identifying a range identification value obtained when the double-range self-adaptive measurement circuit in the first state measures the analog signal to be measured;
the double-range self-adaptive maintenance module is used for obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the double-range self-adaptive measurement circuit in the first state, when the range identification value is in a first measurement range corresponding to the first state;
and the double-range self-adaptive switching module is used for switching the double-range self-adaptive measuring circuit into a second state when the range identification value is not in a first measuring range corresponding to the first state, and obtaining analog signal measuring data corresponding to the analog signal to be measured, which is measured by the double-range self-adaptive measuring circuit in the second state.
Specifically, the dual-range adaptive measurement circuit includes:
an analog signal input for receiving the analog signal to be measured;
The first capacitor is used for filtering the analog signal to be measured;
the collector of the first triode is connected with one end of a first pull-up resistor, the other end of the first pull-up resistor is connected with the first capacitor, the emitter of the first triode is connected to a preset reference voltage, the base of the first triode is connected with one end of a first current-limiting resistor, the other end of the first current-limiting resistor is connected with a preset measuring singlechip port, and the first current-limiting resistor is connected with a first pull-down resistor in series to a grounding point;
the collector of the second triode is connected with one end of a second pull-up resistor, the other end of the second pull-up resistor is connected with a preset RC filter circuit, the emitter of the second triode is connected to a reference voltage, and the base of the second triode is connected with one end of a second current-limiting resistor;
the base electrode of the third triode is connected with one end of a second current-limiting resistor, the other end of the second current-limiting resistor is connected with a port of the measuring singlechip, the collector electrode of the third triode is connected with the other end of the second current-limiting resistor, and the collector electrode of the third triode is connected to a working power supply through a third pull-up resistor;
The RC filter circuit comprises a filter circuit resistor and a filter circuit capacitor which are connected in series, wherein the other end of the filter circuit resistor is connected to the anode of the A/D converter and the anode of the first voltage stabilizing tube, and the cathode of the first voltage stabilizing tube is connected to the working power supply;
the base electrode of the second triode is connected in series with the collector electrode of the third triode through a preset resistor;
the A/D converter is used for outputting analog signal measurement data corresponding to the analog signal to be measured by the dual-range self-adaptive measurement circuit.
Specifically, when the dual-range adaptive measurement circuit is in a first state, the first triode is internally conducted, and the second triode and the third triode are internally non-conducted;
when the double-range self-adaptive measuring circuit is in the second state, the first triode is not conducted, and the second triode and the third triode are conducted.
Further, the dual-range adaptive measurement device further includes:
a power signal receiving terminal for receiving a power signal to be measured;
the power supply signal measuring module is used for measuring the power supply signal to be measured by utilizing a preset voltage acquisition circuit and obtaining corresponding power supply signal measuring data.
Further, the dual-range adaptive measurement device further includes:
A digital signal receiving end for receiving a digital signal to be measured;
the digital signal measuring module is used for measuring the digital signal to be measured by utilizing a preset switch acquisition circuit and obtaining corresponding digital signal measurement data.
The beneficial effects that technical scheme that this application provided brought include:
1. the double-range self-adaptive test circuit is used for adapting to different analog measurement ranges, monitoring the change of analog quantity and realizing automatic switching of measurement ranges, so that the measurement work of different measurement ranges is satisfied.
2. In the application, on a hardware circuit, a dual-range self-adaptive test circuit is provided with 2 test circuits, and the adaptive analog quantity range of each circuit is different; on a software algorithm, the change of an external analog quantity is monitored in real time, the measurement range is automatically switched through a self-adaptive algorithm and a calibration threshold according to the change range software, the higher-precision data acquisition of a relatively full range is covered, and the acquisition and the output of the analog quantity of the vehicle-mounted field under complex extreme working conditions are realized.
3. The technical scheme of the application can be applied to solving the problem of analog acquisition scenes under complex extreme working conditions when in practical application, and fully considers accuracy, economy, universality and portability.
4. The technical scheme of the application can be used in a plurality of fields in industry, does not cause a large amount of research and development investment, has obvious effect of twice with little effort, has strong universality and is convenient to popularize.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a step flowchart of an analog signal measurement flow in a dual-range adaptive measurement method provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a dual range adaptive measurement device provided in an embodiment of the present application;
FIG. 3 is a circuit diagram of a dual range adaptive measurement circuit provided in an embodiment of the present application;
FIG. 4 is a workflow diagram of a dual range adaptive measurement method provided in an embodiment of the present application;
fig. 5 is a block diagram of a dual range adaptive measurement device according to an embodiment of the present application.
Detailed Description
Term interpretation:
a/D converter: an analog-to-digital converter;
VREF: voltage Reference, reference voltage;
GND: group, wire Ground.
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a double-range self-adaptive measurement method and device, which utilize a double-range self-adaptive test circuit to adapt to different analog measurement ranges, monitor the change of analog quantity and realize automatic switching of measurement ranges so as to meet the measurement work of different measurement ranges.
In order to achieve the technical effects, the general idea of the application is as follows:
the double-range self-adaptive measurement method comprises an analog signal measurement process, wherein the analog signal measurement process comprises the following steps of:
A1, receiving an analog signal to be measured, and measuring the analog signal to be measured by using a preset double-range self-adaptive measuring circuit in a first state;
a2, identifying a range identification value obtained when the dual-range self-adaptive measuring circuit in the first state measures an analog signal to be measured;
a3, when the equivalent range identification value is in a first measurement range corresponding to the first state, obtaining analog signal measurement data corresponding to an analog signal to be measured by the double-range self-adaptive measurement circuit in the first state;
and A4, when the equivalent range identification value is not in the first measurement range corresponding to the first state, switching the dual-range self-adaptive measurement circuit into the second state, and obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the dual-range self-adaptive measurement circuit in the second state.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings.
In a first aspect, an embodiment of the present application provides a dual range adaptive measurement method, including an analog signal measurement procedure, where the analog signal measurement procedure includes the following steps:
a1, receiving an analog signal to be measured, and measuring the analog signal to be measured by using a preset double-range self-adaptive measuring circuit in a first state;
A2, identifying a range identification value obtained when the dual-range self-adaptive measuring circuit in the first state measures an analog signal to be measured;
a3, when the equivalent range identification value is in a first measurement range corresponding to the first state, obtaining analog signal measurement data corresponding to an analog signal to be measured by the double-range self-adaptive measurement circuit in the first state;
and A4, when the equivalent range identification value is not in the first measurement range corresponding to the first state, switching the dual-range self-adaptive measurement circuit into the second state, and obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the dual-range self-adaptive measurement circuit in the second state.
Further, the method also comprises a power signal measurement process, wherein the power signal measurement process comprises the following steps:
and receiving a power signal to be measured, measuring the power signal to be measured by using a preset voltage acquisition circuit, and obtaining corresponding power signal measurement data.
Further, the method also comprises a digital signal measurement process, wherein the digital signal measurement process comprises the following steps:
and receiving the digital signal to be measured, measuring the digital signal to be measured by using a preset switch acquisition circuit, and obtaining corresponding digital signal measurement data.
In the embodiment of the application, the double-range self-adaptive test circuit is utilized to adapt to different analog measurement ranges, monitor the change of analog quantity and realize automatic switching of measurement ranges, so that the measurement work of different measurement ranges is satisfied.
The technical scheme of the embodiment of the application is suitable for collecting various analog signals with large dynamic range, wide in application range and strong in adaptability, and based on a conventional collecting circuit and a software algorithm, the technical scheme does not consume large software resources, and is good in executable performance.
In practical application, the technical scheme of the embodiment of the application can be applied to solving the problem of analog quantity acquisition scenes under complex extreme working conditions, and fully considers accuracy, economy, universality and portability;
the method can be used in a plurality of fields in industry, does not cause a large amount of research and development investment, has obvious effect of twice the result with half effort, has strong universality and is convenient to popularize.
Specifically, the dual-range adaptive measurement circuit in the first state corresponds to a first measurement range and is denoted as range 1;
the dual-range adaptive measurement circuit in the second state corresponds to the second measurement range and is denoted as range 2.
The hysteresis interval is set between two ranges, and the condition that the ranges are switched back and forth when the external signal changes around a threshold Rth is prevented, specifically set as follows:
Assuming that the upper limit value of the range 1 is set to (rth+a), and the lower limit value of the range 2 is set to (Rth-b), (rth+a) > (Rth-b);
when the external signal rises to be greater than (rth+a), the range 1 is switched to the range 2;
conversely, when the external signal is reduced to be smaller than (Rth-b), the measuring range 2 is switched to the measuring range 1, and the system stability and the measuring precision are improved.
The upper limit value of the measuring range 1 is larger than the lower limit value of the measuring range 2;
the upper limit value of the measuring range 2 is larger than the upper limit value of the measuring range 1;
the lower limit of span 1 is less than the lower limit of span 2.
Specifically, the dual-range adaptive measurement circuit includes:
an analog signal input for receiving the analog signal to be measured;
the first capacitor is used for filtering the analog signal to be measured;
the collector of the first triode is connected with one end of a first pull-up resistor, the other end of the first pull-up resistor is connected with the first capacitor, the emitter of the first triode is connected to a preset reference voltage, the base of the first triode is connected with one end of a first current-limiting resistor, the other end of the first current-limiting resistor is connected with a preset measuring singlechip port, and the first current-limiting resistor is connected with a first pull-down resistor in series to a grounding point;
The collector of the second triode is connected with one end of a second pull-up resistor, the other end of the second pull-up resistor is connected with a preset RC filter circuit, the emitter of the second triode is connected to a reference voltage, and the base of the second triode is connected with one end of a second current-limiting resistor;
the base electrode of the third triode is connected with one end of a second current-limiting resistor, the other end of the second current-limiting resistor is connected with a port of the measuring singlechip, the collector electrode of the third triode is connected with the other end of the second current-limiting resistor, and the collector electrode of the third triode is connected to a working power supply through a third pull-up resistor;
the RC filter circuit comprises a filter circuit resistor and a filter circuit capacitor which are connected in series, wherein the other end of the filter circuit resistor is connected to the anode of the A/D converter and the anode of the first voltage stabilizing tube, and the cathode of the first voltage stabilizing tube is connected to the working power supply;
the base electrode of the second triode is connected in series with the collector electrode of the third triode through a preset resistor;
the A/D converter is used for outputting analog signal measurement data corresponding to the analog signal to be measured by the dual-range self-adaptive measurement circuit.
Specifically, when the dual-range adaptive measurement circuit is in a first state, the first triode is internally conducted, and the second triode and the third triode are internally non-conducted;
When the double-range self-adaptive measuring circuit is in the second state, the first triode is not conducted, and the second triode and the third triode are conducted.
Fig. 2 is a schematic diagram of a dual range adaptive measurement device according to an embodiment of the present application:
first, the power signal receiving end receives a power signal, the power signal is converted into a stable voltage signal through a voltage acquisition circuit in a preset power signal measuring module, and the stable voltage signal is input to an A/D converter of the main controller, so that the current power mode can be conveniently identified.
And secondly, the digital signal receiving end receives digital signals, the digital signals can simultaneously acquire multiple paths of switching value signals through a multi-channel switching value acquisition chip circuit in a preset digital signal measurement module, and only one path of switching value signals is listed in the figure.
Thirdly, aiming at the analog signals, the analog quantity with large-range fluctuation is connected to a double-range self-adaptive acquisition circuit, and the circuit automatically selects a pull-up resistor and a triode according to a preset threshold value to accurately acquire and process the wide-range analog quantity signals, so that the stability of the system is ensured.
The above measured signals are calculated and processed by the main controller of the dual-range adaptive measuring device to obtain a stable strategy result, and the strategy result is displayed, stored or driven according to the established strategy.
The dual-range adaptive measurement circuit provided in the embodiment of the present application is shown in fig. 3:
signal_input is an analog Signal Input end and is used for receiving analog signals, and the variation range of the analog signals is larger.
The first capacitor C1 carries out filtering treatment on an input analog signal, the first pull-up resistor R3 is connected with the collector electrode of the first triode Q1, the emitter electrode of the first triode Q1 is connected with the reference voltage VREF, the base electrode of the first triode Q1 is connected with one end of the first current-limiting resistor R2, the other end of the first current-limiting resistor R2 is connected with the MCU (micro-controller unit) port MCU_GPIO, a first pull-down resistor R1 to GND is designed at the point, and the first pull-down resistor R1 provides a stable control state in the MCU_GPIO high-resistance state.
The second pull-up resistor R4 is connected with the collector of the second triode Q2, the emitter of the second triode Q2 is connected with the reference voltage VREF, and the base of the second triode Q2 is connected with one end of the second current limiting resistor R6.
The other end of the current limiting resistor R6 is connected with a collector of a third triode Q3, the collector is connected to a working power supply VDD through a third pull-up resistor R8, the base of the third triode Q3 is connected with one end of a third current limiting resistor R7, and the other end of the third current limiting resistor R7 is connected to a measuring mechanism singlechip port MCU_GPIO.
The other end of the second pull-up resistor R4 is connected with an RC filter circuit, and the filter circuit comprises a filter circuit resistor R5 and a filter circuit capacitor C2, so that the stability of the acquired signals and the disturbance rejection capability of the system are further improved.
The other end of the filter circuit resistor R5 is connected to an A/D converter integrated by the measuring mechanism singlechip, the point is also connected to the anode of the first voltage stabilizing tube D1, and the cathode of the first voltage stabilizing tube D1 is connected to the working power supply VDD to prevent the damage to the measuring mechanism singlechip caused by the instantaneous high voltage input from the outside.
The working flow of the double-range self-adaptive measurement method provided by the invention is shown in figure 4 by a software algorithm scheme:
ON the whole vehicle, the ON gear electricity is provided, the measuring mechanism is initialized, the first triode Q1 is conducted under the default state, and the first triode Q1 is connected to the first pull-up resistor R3 for measurement.
At this time, the MCU_AD port filters and A/D converts the measurement signal, and software judges whether the MCU_AD conversion value is in the range of the measuring range 1 according to the preset measuring range.
If the signal measured by the pull-up resistor R3 is in the range of the measuring range 1, the software performs anti-shake, operation and processing, stores, displays and sends out the measured result, or controls the executing mechanism to complete a specific function;
Otherwise, the MCU_GPIO port outputs a high level, controls the second triode Q2 and the third triode Q3 to be conducted, and is connected with the second pull-up resistor R4 for measurement, and the measurement result is output.
In the embodiment of the application, two paths of acquisition reference power supplies are designed on a hardware circuit, and the adaptive analog quantity ranges of each path are different;
on the software algorithm, the change of the external analog quantity is monitored in real time, the measurement range can be automatically switched through the self-adaptive algorithm and the calibration threshold according to the change range software, the full-range high-precision data acquisition is covered, and the acquisition and the output of the analog quantity under the complex extreme working condition in the vehicle-mounted field are realized.
It should be noted that the above range boundary value can also support calibration, and when the device leaves the factory, parameter calibration is performed according to the adapted vehicle model, so that the application range is wider, and the acquisition precision is higher.
In a second aspect, embodiments of the present application provide, based on the technology of the dual-range adaptive measurement method mentioned in the first aspect, a dual-range adaptive measurement device, where the device includes:
an analog signal receiving end for receiving an analog signal to be measured;
the double-range self-adaptive measurement module is used for measuring the analog signal to be measured;
The double-range self-adaptive identification module is used for identifying a range identification value obtained when the double-range self-adaptive measurement circuit in the first state measures the analog signal to be measured;
the double-range self-adaptive maintenance module is used for obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the double-range self-adaptive measurement circuit in the first state, when the range identification value is in a first measurement range corresponding to the first state;
and the double-range self-adaptive switching module is used for switching the double-range self-adaptive measuring circuit into a second state when the range identification value is not in a first measuring range corresponding to the first state, and obtaining analog signal measuring data corresponding to the analog signal to be measured, which is measured by the double-range self-adaptive measuring circuit in the second state.
In the embodiment of the application, the double-range self-adaptive test circuit is utilized to adapt to different analog measurement ranges, monitor the change of analog quantity and realize automatic switching of measurement ranges, so that the measurement work of different measurement ranges is satisfied.
Specifically, the dual-range adaptive measurement circuit in the first state corresponds to a first measurement range and is denoted as range 1;
The dual-range adaptive measurement circuit in the second state corresponds to the second measurement range and is denoted as range 2.
The hysteresis interval is set between two ranges, and the condition that the ranges are switched back and forth when the external signal changes around a threshold Rth is prevented, specifically set as follows:
assuming that the upper limit value of the range 1 is set to (rth+a), and the lower limit value of the range 2 is set to (Rth-b), (rth+a) > (Rth-b);
when the external signal rises to be greater than (rth+a), the range 1 is switched to the range 2;
conversely, when the external signal is reduced to be smaller than (Rth-b), the measuring range 2 is switched to the measuring range 1, and the system stability and the measuring precision are improved.
The upper limit value of the measuring range 1 is larger than the lower limit value of the measuring range 2;
the upper limit value of the measuring range 2 is larger than the upper limit value of the measuring range 1;
the lower limit of span 1 is less than the lower limit of span 2.
Specifically, the dual-range adaptive measurement circuit includes:
an analog signal input for receiving the analog signal to be measured;
the first capacitor is used for filtering the analog signal to be measured;
the collector of the first triode is connected with one end of a first pull-up resistor, the other end of the first pull-up resistor is connected with the first capacitor, the emitter of the first triode is connected to a preset reference voltage, the base of the first triode is connected with one end of a first current-limiting resistor, the other end of the first current-limiting resistor is connected with a preset measuring singlechip port, and the first current-limiting resistor is connected with a first pull-down resistor in series to a grounding point;
The collector of the second triode is connected with one end of a second pull-up resistor, the other end of the second pull-up resistor is connected with a preset RC filter circuit, the emitter of the second triode is connected to a reference voltage, and the base of the second triode is connected with one end of a second current-limiting resistor;
the base electrode of the third triode is connected with one end of a second current-limiting resistor, the other end of the second current-limiting resistor is connected with a port of the measuring singlechip, the collector electrode of the third triode is connected with the other end of the second current-limiting resistor, and the collector electrode of the third triode is connected to a working power supply through a third pull-up resistor;
the RC filter circuit comprises a filter circuit resistor and a filter circuit capacitor which are connected in series, wherein the other end of the filter circuit resistor is connected to the anode of the A/D converter and the anode of the first voltage stabilizing tube, and the cathode of the first voltage stabilizing tube is connected to the working power supply;
the base electrode of the second triode is connected in series with the collector electrode of the third triode through a preset resistor;
the A/D converter is used for outputting analog signal measurement data corresponding to the analog signal to be measured by the dual-range self-adaptive measurement circuit.
Specifically, when the dual-range adaptive measurement circuit is in a first state, the first triode is internally conducted, and the second triode and the third triode are internally non-conducted;
When the double-range self-adaptive measuring circuit is in the second state, the first triode is not conducted, and the second triode and the third triode are conducted.
Specifically, the dual-range adaptive measurement device further comprises:
a power signal receiving terminal for receiving a power signal to be measured;
the power supply signal measuring module is used for measuring the power supply signal to be measured by utilizing a preset voltage acquisition circuit and obtaining corresponding power supply signal measuring data.
Specifically, the dual-range adaptive measurement device further comprises:
a digital signal receiving end for receiving a digital signal to be measured;
the digital signal measuring module is used for measuring the digital signal to be measured by utilizing a preset switch acquisition circuit and obtaining corresponding digital signal measurement data.
Fig. 2 is a schematic diagram of a dual range adaptive measurement device according to an embodiment of the present application:
first, the power signal receiving end receives a power signal, the power signal is converted into a stable voltage signal through a voltage acquisition circuit in a preset power signal measuring module, and the stable voltage signal is input to an A/D converter of the main controller, so that the current power mode can be conveniently identified.
And secondly, the digital signal receiving end receives digital signals, the digital signals can simultaneously acquire multiple paths of switching value signals through a multi-channel switching value acquisition chip circuit in a preset digital signal measurement module, and only one path of switching value signals is listed in the figure.
Thirdly, aiming at the analog signals, the analog quantity with large-range fluctuation is connected to a double-range self-adaptive acquisition circuit, and the circuit automatically selects a pull-up resistor and a triode according to a preset threshold value to accurately acquire and process the wide-range analog quantity signals, so that the stability of the system is ensured.
The above measured signals are calculated and processed by the main controller of the dual-range adaptive measuring device to obtain a stable strategy result, and the strategy result is displayed, stored or driven according to the established strategy.
The dual-range adaptive measurement circuit provided in the embodiment of the present application is shown in fig. 3:
signal_input is an analog Signal Input end and is used for receiving analog signals, and the variation range of the analog signals is larger.
The first capacitor C1 carries out filtering treatment on an input analog signal, the first pull-up resistor R3 is connected with the collector electrode of the first triode Q1, the emitter electrode of the first triode Q1 is connected with the reference voltage VREF, the base electrode of the first triode Q1 is connected with one end of the first current-limiting resistor R2, the other end of the first current-limiting resistor R2 is connected with the MCU (micro-controller unit) port MCU_GPIO, a first pull-down resistor R1 to GND is designed at the point, and the first pull-down resistor R1 provides a stable control state in the MCU_GPIO high-resistance state.
The second pull-up resistor R4 is connected with the collector of the second triode Q2, the emitter of the second triode Q2 is connected with the reference voltage VREF, and the base of the second triode Q2 is connected with one end of the second current limiting resistor R6.
The other end of the current limiting resistor R6 is connected with a collector of a third triode Q3, the collector is connected to a working power supply VDD through a third pull-up resistor R8, the base of the third triode Q3 is connected with one end of a third current limiting resistor R7, and the other end of the third current limiting resistor R7 is connected to a measuring mechanism singlechip port MCU_GPIO.
The other end of the second pull-up resistor R4 is connected with an RC filter circuit, and the filter circuit comprises a filter circuit resistor R5 and a filter circuit capacitor C2, so that the stability of the acquired signals and the disturbance rejection capability of the system are further improved.
The other end of the filter circuit resistor R5 is connected to an A/D converter integrated by the measuring mechanism singlechip, the point is also connected to the anode of the first voltage stabilizing tube D1, and the cathode of the first voltage stabilizing tube D1 is connected to the working power supply VDD to prevent the damage to the measuring mechanism singlechip caused by the instantaneous high voltage input from the outside.
The working flow of the double-range self-adaptive measurement method provided by the invention is shown in figure 4 by a software algorithm scheme:
ON the whole vehicle, the ON gear electricity is provided, the measuring mechanism is initialized, the first triode Q1 is conducted under the default state, and the first triode Q1 is connected to the first pull-up resistor R3 for measurement.
At this time, the MCU_AD port filters and A/D converts the measurement signal, and software judges whether the MCU_AD conversion value is in the range of the measuring range 1 according to the preset measuring range.
If the signal measured by the pull-up resistor R3 is in the range of the measuring range 1, the software performs anti-shake, operation and processing, stores, displays and sends out the measured result, or controls the executing mechanism to complete a specific function;
otherwise, the MCU_GPIO port outputs a high level, controls the second triode Q2 and the third triode Q3 to be conducted, and is connected with the second pull-up resistor R4 for measurement, and the measurement result is output.
In the embodiment of the application, two paths of acquisition reference power supplies are designed on a hardware circuit, and the adaptive analog quantity ranges of each path are different;
on the software algorithm, the change of the external analog quantity is monitored in real time, the measurement range can be automatically switched through the self-adaptive algorithm and the calibration threshold according to the change range software, the full-range high-precision data acquisition is covered, and the acquisition and the output of the analog quantity under the complex extreme working condition in the vehicle-mounted field are realized.
It should be noted that the above range boundary value can also support calibration, and when the device leaves the factory, parameter calibration is performed according to the adapted vehicle model, so that the application range is wider, and the acquisition precision is higher.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A dual range adaptive measurement method, the method comprising the steps of:
receiving an analog signal to be measured, and measuring the analog signal to be measured by using a preset double-range self-adaptive measuring circuit in a first state; the analog signal to be measured is a resistance signal in an automobile;
identifying a range identification value obtained when the dual-range adaptive measurement circuit in the first state measures the analog signal to be measured;
when the range identification value is in a first measurement range corresponding to the first state, obtaining analog signal measurement data corresponding to the analog signal to be measured by a double-range self-adaptive measurement circuit in the first state;
when the range identification value is not in the first measurement range corresponding to the first state, switching the dual-range adaptive measurement circuit into a second state, and obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the dual-range adaptive measurement circuit in the second state;
the double-range self-adaptive measuring circuit in the first state measures a corresponding first measuring range, and is recorded as range 1; the double-range self-adaptive measuring circuit in the second state corresponds to a second measuring range and is marked as range 2;
A hysteresis interval is set between two measuring ranges, so that the condition that the measuring ranges are switched back and forth when an external signal changes around a threshold Rth is prevented, and the hysteresis interval is specifically set as follows:
assuming that the upper limit value of the range 1 is set to (rth+a), and the lower limit value of the range 2 is set to (Rth-b), (rth+a) > (Rth-b);
when the external signal rises to be greater than (rth+a), the range 1 is switched to the range 2; conversely, when the external signal falls below (Rth-b), span 2 switches to span 1;
the upper limit value of the measuring range 1 is larger than the lower limit value of the measuring range 2; the upper limit value of the measuring range 2 is larger than the upper limit value of the measuring range 1; the lower limit value of the measuring range 1 is smaller than the lower limit value of the measuring range 2;
the dual range adaptive measurement circuit includes:
an analog Signal Input end Signal_input for receiving the analog Signal to be measured;
a first capacitor C1 for filtering the analog signal to be measured;
first triode Q 1 The first triode Q 1 Collector of (1) and first pull-up resistor R 3 Is connected with one end of the first pull-up resistor R 3 Is connected with the other end of the first capacitor C1The first triode Q 1 The emitter of the first triode Q is connected to a preset reference voltage VREF 1 Base of (2) and first current limiting resistor R 2 Is connected with one end of the first current limiting resistor R 2 The other end of the first pull-down resistor is connected with a preset measurement singlechip port MCU_GPIO and also connected with a first pull-down resistor R 1 Connected in series to ground GND;
second triode Q 2 The second triode Q 2 Collector of (2) and second pull-up resistor R 4 Is connected with one end of the second pull-up resistor R 4 The other end of the second triode Q is connected with a preset RC filter circuit 2 The emitter of the second triode Q is connected to the reference voltage VREF 2 Base of (2) and a second current limiting resistor R 6 Is connected with one end of the connecting rod;
third triode Q 3 The third triode Q 3 The base electrode of (a) is connected with a third current-limiting resistor R 7 Is one end of the third current limiting resistor R 7 The other end of the third triode Q is connected with a measuring singlechip port MCU_GPIO 3 Collector of (a) and a second current limiting resistor R 6 Is connected with the other end of the third triode Q 3 Through a third pull-up resistor R 8 Is connected to an operating power supply VDD;
the RC filter circuit comprises a filter circuit resistor R connected in series 5 And filter circuit capacitor C 2 The filter circuit resistor R 5 The other end of the first voltage stabilizing tube D1 is connected to the anode of the A/D converter and the cathode of the first voltage stabilizing tube D1 is connected to the working power supply VDD;
second triode Q 2 Base of (d) and third triode Q 3 The collector of (2) passes through a second current-limiting resistor R 6 Serial connection;
the A/D converter is used for outputting analog signal measurement data corresponding to the analog signal to be measured by the double-range self-adaptive measurement circuit;
the working flow of the double-range self-adaptive measurement method comprises the following steps:
ON-gear power supply of the whole vehicle, the measuring mechanism is initialized, and the first triode Q is in a default state 1 ConductionIs connected with a first pull-up resistor R 3 Measuring; at the moment, the MCU_AD port filters and A/D converts the measurement signal, and software judges whether the MCU_AD conversion value is in a range of a range 1 according to a preset range; if pass through pull-up resistor R 3 The measured signal is in the range of range 1, the software performs anti-shake, operation and processing, and stores, displays and sends out the measuring structure, or controls the executing mechanism to complete the specific function; otherwise, the MCU_GPIO port outputs a high level to control the second triode Q 2 Third triode Q 3 Conducting and connecting with a second pull-up resistor R 4 And (5) measuring, and outputting a measurement result.
2. The dual range adaptive measurement method of claim 1, wherein:
when the double-range self-adaptive measuring circuit is in a first state, the inside of the first triode is conducted, and the inside of the second triode and the inside of the third triode are not conducted;
When the double-range self-adaptive measuring circuit is in the second state, the first triode is not conducted, and the second triode and the third triode are conducted.
3. The dual range adaptive measurement method according to claim 1, further comprising the steps of:
and receiving a power signal to be measured, measuring the power signal to be measured by using a preset voltage acquisition circuit, and obtaining corresponding power signal measurement data.
4. The dual range adaptive measurement method according to claim 1, further comprising the steps of:
and receiving the digital signal to be measured, measuring the digital signal to be measured by using a preset switch acquisition circuit, and obtaining corresponding digital signal measurement data.
5. A dual range adaptive measurement device, the device comprising:
an analog signal receiving end for receiving an analog signal to be measured; the analog signal to be measured is a resistance signal in an automobile;
the double-range self-adaptive measurement module is used for measuring the analog signal to be measured;
the double-range self-adaptive identification module is used for identifying a range identification value obtained when the double-range self-adaptive measurement circuit in the first state measures the analog signal to be measured;
The double-range self-adaptive maintenance module is used for obtaining analog signal measurement data corresponding to the analog signal to be measured, which is measured by the double-range self-adaptive measurement circuit in the first state, when the range identification value is in a first measurement range corresponding to the first state;
the double-range self-adaptive switching module is used for switching the double-range self-adaptive measuring circuit into a second state when the range identification value is not in a first measuring range corresponding to the first state, and obtaining analog signal measuring data corresponding to the analog signal to be measured, which is measured by the double-range self-adaptive measuring circuit in the second state;
the double-range self-adaptive measuring circuit in the first state measures a corresponding first measuring range, and is recorded as range 1; the double-range self-adaptive measuring circuit in the second state corresponds to a second measuring range and is marked as range 2;
a hysteresis interval is set between two measuring ranges, so that the condition that the measuring ranges are switched back and forth when an external signal changes around a threshold Rth is prevented, and the hysteresis interval is specifically set as follows:
assuming that the upper limit value of the range 1 is set to (rth+a), and the lower limit value of the range 2 is set to (Rth-b), (rth+a) > (Rth-b);
When the external signal rises to be greater than (rth+a), the range 1 is switched to the range 2; conversely, when the external signal falls below (Rth-b), span 2 switches to span 1;
the upper limit value of the measuring range 1 is larger than the lower limit value of the measuring range 2; the upper limit value of the measuring range 2 is larger than the upper limit value of the measuring range 1; the lower limit value of the measuring range 1 is smaller than the lower limit value of the measuring range 2;
the dual range adaptive measurement circuit includes:
an analog Signal Input end Signal_input for receiving the analog Signal to be measured;
a first capacitor C1 for filtering the analog signal to be measured;
first triode Q 1 The first triode Q 1 Collector of (1) and first pull-up resistor R 3 Is connected with one end of the first pull-up resistor R 3 The other end of the first triode Q is connected with the first capacitor C1 1 The emitter of the first triode Q is connected to a preset reference voltage VREF 1 Base of (2) and first current limiting resistor R 2 Is connected with one end of the first current limiting resistor R 2 The other end of the first pull-down resistor is connected with a preset measurement singlechip port MCU_GPIO and also connected with a first pull-down resistor R 1 Connected in series to ground GND;
second triode Q 2 The second triode Q 2 Collector of (2) and second pull-up resistor R 4 Is connected with one end of the second pull-up resistor R 4 The other end of the second triode Q is connected with a preset RC filter circuit 2 The emitter of the second triode Q is connected to the reference voltage VREF 2 Base of (2) and a second current limiting resistor R 6 Is connected with one end of the connecting rod;
third triode Q 3 The third triode Q 3 The base electrode of (a) is connected with a second current-limiting resistor R 7 Is one end of the second current limiting resistor R 7 The other end of the third triode Q is connected with a measuring singlechip port MCU_GPIO 3 Collector of (a) and a second current limiting resistor R 6 Is connected with the other end of the third triode Q 3 Through a third pull-up resistor R 8 Is connected to an operating power supply VDD;
the RC filter circuit comprises a filter circuit resistor R connected in series 5 And filter circuit capacitor C 2 The filter circuit resistor R 5 The other end of the first voltage stabilizing tube D1 is connected to the anode of the A/D converter and the cathode of the first voltage stabilizing tube D1 is connected to the working power supply VDD;
second oneTriode Q 2 Base of (d) and third triode Q 3 The collector of (2) passes through a second current-limiting resistor R 6 Serial connection;
the A/D converter is used for outputting analog signal measurement data corresponding to the analog signal to be measured by the double-range self-adaptive measurement circuit;
the working flow of the double-range self-adaptive measuring device comprises the following steps:
ON-gear power supply of the whole vehicle, the measuring mechanism is initialized, and the first triode Q is in a default state 1 Turned on and connected to the first pull-up resistor R 3 Measuring; at the moment, the MCU_AD port filters and A/D converts the measurement signal, and software judges whether the MCU_AD conversion value is in a range of a range 1 according to a preset range; if pass through pull-up resistor R 3 The measured signal is in the range of range 1, the software performs anti-shake, operation and processing, and stores, displays and sends out the measuring structure, or controls the executing mechanism to complete the specific function; otherwise, the MCU_GPIO port outputs a high level to control the second triode Q 2 Third triode Q 3 Conducting and connecting with a second pull-up resistor R 4 And (5) measuring, and outputting a measurement result.
6. The dual range adaptive measurement device according to claim 5, wherein:
when the double-range self-adaptive measuring circuit is in a first state, the inside of the first triode is conducted, and the inside of the second triode and the inside of the third triode are not conducted;
when the double-range self-adaptive measuring circuit is in the second state, the first triode is not conducted, and the second triode and the third triode are conducted.
7. The dual-range adaptive measurement device according to claim 5, further comprising:
A power signal receiving terminal for receiving a power signal to be measured;
the power supply signal measuring module is used for measuring the power supply signal to be measured by utilizing a preset voltage acquisition circuit and obtaining corresponding power supply signal measuring data.
8. The dual-range adaptive measurement device according to claim 5, further comprising:
a digital signal receiving end for receiving a digital signal to be measured;
the digital signal measuring module is used for measuring the digital signal to be measured by utilizing a preset switch acquisition circuit and obtaining corresponding digital signal measurement data.
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