CN104913767A - Temperature depth detecting device based CAN bus, temperature depth detecting system based CAN bus and temperature depth detecting method based CAN bus - Google Patents
Temperature depth detecting device based CAN bus, temperature depth detecting system based CAN bus and temperature depth detecting method based CAN bus Download PDFInfo
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- CN104913767A CN104913767A CN201510290703.7A CN201510290703A CN104913767A CN 104913767 A CN104913767 A CN 104913767A CN 201510290703 A CN201510290703 A CN 201510290703A CN 104913767 A CN104913767 A CN 104913767A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
- G01C13/008—Surveying specially adapted to open water, e.g. sea, lake, river or canal measuring depth of open water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
Abstract
The invention relates to a temperature depth detecting device based a CAN bus, a temperature depth detecting system based a CAN bus and a temperature depth detecting method based a CAN bus. The device comprises a pressure detecting module, a temperature detecting module, a processing module and a CAN bus module, wherein the pressure detecting module is used for obtaining a first analog signal and sending the first analog signal to the processing module; the temperature detecting module is used for obtaining a second analog signal and the sending the second analog signal to the processing module; the processing module is used for converting the first analog signal and the second analog signal into a first digital signal and a second digital signal respectively, and sending the first digital signal and the second digital signal to the CAN bus module; the CAN bus module is used for sending the first digital signal and the second digital signal to an upper computer. According to the device, the system and the method provided by the application, a pressure sensor and a temperature sensor with novel process are utilized for acquiring data, so that the precision is greatly improved. Furthermore, the acquired data is transmitted to the upper computer through a CAN bus. The CAN bus is used for data transmission, the correcting capability is strong, the transmission distance is long, and the communication speed is high.
Description
Technical field
The application relates to Ocean environment information monitoring technical field, particularly relates to a kind of warm depth finding device, system and method based on controller local area network (Controller Area Network, CAN) bus.
Background technology
Jettison formula temp probe (expendable bathythermograph, be called for short XBT), can not affect under ships operational configuration, quick obtaining ocean temperature section, measure problem with solving the ocean environment parameter of ships under maneuvering condition, be also the very important measurement equipment in the aspect such as oceanographic survey, Underwater Detection and measurement means simultaneously.
XBT is primarily of compositions such as gesture stability parts, temperature sensor, signal transmssion lines.Gesture stability parts on probe, make probe decline in the seawater according to certain rule.After throwing in XBT, when arriving sea when popping one's head in, the timer in data acquisition board starts timing, like this by the decline rate of popping one's head in and fall time, just can calculate probe depth value in the seawater; Meanwhile, be arranged on the temperature sensor of probe front end, the temperature value of seawater according to certain rules, convert corresponding resistance value to, and by signal transmssion line, the resistance value of temperature sensor, be transferred in real time in data acquisition unit for sampling.Just can calculate the temperature value of current seawater according to resistance value, thus obtain the temperature depth section data of seawater.
In prior art, the measuring accuracy of XBT is not very high, and adopts 485 bus communication modes and host computer to carry out communication, although 485 bus protocols are simple, realize facilitating, has error correcting capability difference, the shortcomings such as transmission range is short.When measuring in deep-marine-environment, due to transmission range, 485 buses are difficult to meet the requirements of sampling rate.
Summary of the invention
The object of the application is to provide a kind of warm depth finding device, system and method based on CAN, to solve traditional X-ray BT by estimating that not high and 485 buses of ocean depth measuring accuracy are difficult to meet the requirements of the problem of sampling rate fall time.
For achieving the above object, first aspect, this application provides a kind of warm depth finding device based on CAN, described device comprises: pressure detecting module, temperature sensing module, processing module, CAN module;
Described first simulating signal for obtaining the first simulating signal, and is sent to described processing module by described pressure detecting module;
Described second simulating signal for obtaining the second simulating signal, and is sent to described processing module by described temperature sensing module;
Described processing module is used for described first simulating signal and described second simulating signal to be converted to the first digital signal and the second digital signal respectively, and described first digital signal and described second digital signal are sent to described CAN module;
Described CAN module is used for described first digital signal and described second digital signal to send to host computer.
Second aspect, this application provides a kind of warm depth sensing system based on CAN, and described system comprises the warm depth finding device based on CAN and host computer that the embodiment of the present invention provides;
Described host computer for the first digital signal of receiving described CAN module and sending and the second digital signal, and respectively according to described first digital signal and described second digital signal determination ocean depth information and ocean temperature information.
The third aspect, this application provides a kind of warm depth finding method based on CAN, described method comprises:
Obtain the first simulating signal and the second simulating signal respectively;
Described first simulating signal and the second simulating signal are converted to the first digital signal and the second digital signal respectively;
Described first digital signal and described second digital signal is transmitted based on CAN communication protocol;
Respectively according to described first digital signal and described second digital signal, determine ocean depth information and ocean temperature information.
Warm depth finding device, system and method based on CAN that the application provides, utilize and be placed on the pressure transducer of the new technology of probe segment and temperature sensor obtains ocean temperature data and ocean depth data respectively, measuring accuracy significantly improves.Further, the data collected are passed to host computer by CAN by XBT probe and be then passed to computing machine.Utilize CAN to carry out data transmission, error correcting capability is strong, and long transmission distance, traffic rate is high.
Accompanying drawing explanation
The warm depth finding device schematic diagram based on CAN that Fig. 1 provides for the embodiment of the present application one;
The warm depth sensing system schematic diagram based on CAN that Fig. 2 provides for the embodiment of the present application two;
The warm depth finding method flow diagram based on CAN that Fig. 3 provides for the embodiment of the present application three;
Fig. 4 is pressure detecting module schematic diagram;
Fig. 5 is temperature sensing module diagram;
Fig. 6 is the pressure probe unit circuit diagram in pressure detecting module;
Fig. 7 is the temperature detecting unit circuit diagram in temperature sensing module.
Embodiment
Below by drawings and Examples, the technical scheme of the application is described in further detail.
The warm depth finding device schematic diagram based on CAN that Fig. 1 provides for the embodiment of the present application one.As shown in Figure 1, described device comprises: pressure detecting module 10, temperature sensing module 20, processing module 30, CAN module 40;
Pressure detecting module 10 comprises pressure probe unit 101 and transmitting element 102 (as shown in Figure 4).Pressure probe unit with 101 in output first simulating signal; Transmitting element 102 is for being sent to processing module 30 by the first simulating signal.Temperature sensing module 20 comprises temperature detecting unit 201 and transmitting element 202 (as shown in Figure 5).Temperature detecting unit 201 is for exporting the second simulating signal, and transmitting element 202 is for being sent to processing module 30 by the second simulating signal, and processing module 30 is specifically as follows single-chip microcomputer.
It should be noted that, wherein the transmitting element 102 in pressure detecting module and the transmitting element 202 in temperature sensing module can pass through PC control, make the transmitting element 102 in pressure detecting module and the transmitting element 202 in temperature sensing module the first simulating signal and the second simulating signal being sent to respectively in processing module at times.Such as: the first simulating signal is sent in processing module in first time period by the transmitting element 102 in pressure detecting module; Second time period, the second simulating signal is sent in processing module by the transmitting element 202 in temperature sensing module, by that analogy.Processing module 30 also comprises receiving element, converting unit and transmitting element.Receiving element in processing module 30 comprises two receiving cables, the first simulating signal that the transmitting element 102 for receiving respectively in pressure detecting module 10 sends, and the second simulating signal that the transmitting element 202 in temperature sensing module 20 sends; First simulating signal and the second simulating signal in the receiving element being transformed into processing module 30 respectively two passages of time segment, will be converted to the first digital signal and the second digital signal by converting unit (for A/D converter in the present embodiment) in processing module 30 respectively.Transmitting element in processing module 30 the first digital signal and the second digital signal are carried out a point byte be sent to CAN module 40 (can be as required, the byte allocation for the first digital signal and the second digital signal in each Frame is set voluntarily, such as, before in a Frame, several byte is the first digital signal, and remaining byte is the second digital signal).Wherein, CAN module 40 receives the first digital signal and the second digital signal and sends to host computer.
The warm depth finding device based on CAN that the embodiment of the present application one provides, utilize and be placed on the pressure transducer of the new technology of probe segment and temperature sensor obtains ocean temperature data and ocean depth data respectively, measuring accuracy significantly improves.Further, the data collected are passed to host computer by CAN by XBT probe and be then passed to computing machine.It is strong that CAN has error correcting capability, long transmission distance, traffic rate high.
The warm depth sensing system schematic diagram based on CAN that Fig. 2 provides for the embodiment of the present application two.As shown in Figure 2, this system includes the warm depth finding device based on CAN and the host computer 50 of embodiment one.
Based on the warm depth finding device of CAN by the first digital signal and the second digital signal according to the communication protocol of CAN, be sent in host computer 50 by twisted-pair feeder.After first digital signal and the second digital signal are resolved according to certain rule by host computer 50 in a data frame, first digital signal (scale-of-two) is converted to the first numerical value (decimal form of the first digital signal, also be the numerical monitor form of the first simulating signal) simultaneously, according to the first numerical evaluation ocean depth information, second digital signal (scale-of-two) is converted to the second value (decimal form of the second digital signal, also be the numerical monitor form of the second simulating signal simultaneously), calculate ocean temperature information according to second value.
Concrete, because the degree of depth of the first numerical value and ocean is linear, so according to certain proportionate relationship, host computer 50 can go out the depth information of ocean by the first numerical evaluation.
Equally, host computer 50, according to the resistance of the thermistor in second value accounting temperature sensor, according to the resistance of thermistor, is commonly used Steinhart-Hart equation by the resistance-temperature curve of thermistor and is carried out matching:
1/T＝A+Bln(R)+C(lnR)
3(1-1)
Wherein:
T-absolute temperature (K °);
The resistance (Ω) of R-thermistor;
The constant of A, B, C-curve.
The constant term that three temperature spots can be determined in equation is chosen in required temperature-measuring range.Often get more temperature spots in actual applications to calibrate, more accurate matched curve can be obtained.And then calculate the temperature information of ocean accordingly.
The warm depth sensing system based on CAN that the embodiment of the present application two provides, utilize and be placed on the pressure transducer of the new technology of probe segment and temperature sensor obtains ocean temperature data and ocean depth data respectively, measuring accuracy significantly improves.Further, the data collected are passed to host computer by CAN by XBT probe and be then passed to computing machine.It is strong that CAN has error correcting capability, long transmission distance, traffic rate high.
The warm depth finding method flow diagram based on CAN that Fig. 3 provides for the embodiment of the present application three.As shown in Figure 3, described method comprises:
Step 301, obtains the first simulating signal and the second simulating signal respectively;
Particularly, pressure detecting module and temperature sensing module obtain the first simulating signal and the second simulating signal respectively.
Step 302, is converted to the first digital signal and the second digital signal respectively by described first simulating signal and the second simulating signal;
Particularly, the transmitting element in pressure detecting module and the transmitting element in temperature sensing module respectively at times the first simulating signal and the second simulating signal are converted to the first digital signal and the second digital signal.
Step 303, transmits described first digital signal and described second digital signal based on CAN communication protocol;
Particularly, based on the communication protocol of CAN, the first digital signal and the second digital signal are passed through twisted-pair feeder, is sent in host computer.
Step 304, respectively according to described first digital signal and described second digital signal, determines ocean depth information and ocean temperature information.
Particularly, after first digital signal and the second digital signal are resolved according to certain rule by host computer in a data frame, first digital signal (scale-of-two) is converted to the first numerical value (decimal form of the first digital signal is also the numerical monitor form of the first simulating signal simultaneously).Because the degree of depth of the first numerical value and ocean is linear, so according to certain proportionate relationship, the depth information of ocean can be gone out by the first numerical evaluation.
Second digital signal (scale-of-two) is converted to the second value (decimal form of the second digital signal, also be the numerical monitor form of the second simulating signal) simultaneously, according to the resistance of the thermistor in second value accounting temperature sensor, according to the resistance of thermistor, calculate the temperature information of ocean accordingly.
In the present embodiment, the concrete implementation of each step has been described in detail in embodiment one, repeats no more herein.
The warm depth finding method based on CAN that the application provides, utilize and be placed on the pressure transducer of the new technology of probe segment and temperature sensor obtains ocean temperature data and ocean depth data respectively, measuring accuracy significantly improves.Further, the data collected are passed to host computer by CAN by XBT probe and be then passed to computing machine.Utilize CAN to carry out data transmission, error correcting capability is strong, and long transmission distance, traffic rate is high.
Fig. 6 is the probe unit circuit diagram in pressure detecting module provided by the invention, and as shown in Figure 6, this probe unit comprises: pressure transducer (not shown) and amplifying circuit.Pressure transducer is used for the pressure signal in ocean to be converted to the 3rd simulating signal, and is input in described amplifying circuit by the 3rd simulating signal;
Amplifying circuit, specifically for the 3rd simulating signal being changed, obtains described first simulating signal and exports.Wherein, amplifying circuit comprises: the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, digital regulation resistance (not shown) and resistance R1 ~ R9;
Pressure transducer (does not mark pressure transducer in this figure, four ends of pressure transducer are connected respectively four terminals of power supply VO1, namely 4v terminal connects the 4V terminal of power supply VO1, VO+, VO-are connected respectively two output terminals of pressure transducer, ground terminal connects the ground terminal of power supply VO1, and by the ground terminal ground of VO1, so 4 terminals of VO1 in figure can be considered as 4 splicing ears of pressure transducer) the first end of positive 4V connecting terminals connecting resistance R1 and the first end of resistance R2 between node; Positive output end and negative output terminal are connected the positive input terminal of the first operational amplifier and the positive input terminal of the second operational amplifier respectively; The ground terminal ground of pressure transducer; Second end of resistance R1 is connected (first passage for digital regulation resistance between L0 and H0 in figure, digital regulation resistance does not mark in the drawings) by the first passage of digital regulation resistance with the negative input end of the first operational amplifier; Second end of resistance R2 is connected with the negative input end of the second operational amplifier; Node between the first end contact resistance R2 of resistance R3 and described second operational amplifier negative input end; Second end of resistance R3 is connected (second channel for digital regulation resistance between L1 and H0 in figure, digital regulation resistance does not mark in the drawings) by the second channel of digital regulation resistance with the negative input end of the first operational amplifier; The negative input end of the first operational amplifier is connected with the output terminal of this operational amplifier by resistance R4, and the first end of resistance R5 is connected with the negative input end of the second operational amplifier, and the second end is connected with the output terminal of the second operational amplifier; The first end of resistance R6 is connected with the node between the output terminal of the second operational amplifier and second end of resistance R5; Second end of resistance R6 is connected with the negative input end of the 3rd operational amplifier; The first end of resistance R7 is connected with the node between the output terminal of the first operational amplifier and resistance R4; Second end is connected with the positive input terminal of the 3rd operational amplifier; The first end of the positive input terminal of the 3rd operational amplifier also contact resistance R9; The first end of negative input end contact resistance R8; Second end of the output terminal contact resistance R8 of the 3rd operational amplifier; The second end ground connection of resistance R9.
In addition, pressure probe unit also comprises: the first constant pressure source (4V) and the second constant pressure source (1.8V); First constant pressure source, for providing voltage for all circuit in pressure probe unit except the 3rd operational amplifier; Second constant pressure source, for providing voltage for the 3rd operational amplifier.
It should be noted that the Main Function of above-mentioned introduced digital regulation resistance is to adjust zero point in this circuit and Full-span output, the resistance in the resistance of first passage and second channel can be designated as Rd0 and Rd1 respectively.
Wherein, the expression exporting the first simulating signal Vp is shown below:
Due to the numerical value Vp of the first calculated simulating signal and the degree of depth of ocean linear, so when host computer obtains the numerical value Vp of the first simulating signal, the degree of depth of ocean just can be calculated accordingly.
Fig. 7 is the temperature detecting unit circuit diagram in temperature sensing module provided by the invention, and as shown in Figure 7, temperature detecting unit comprises: temperature sensor and modulate circuit;
Temperature sensor is used for ocean temperature signal to be converted to the 4th simulating signal; Modulate circuit is used for changing the 4th simulating signal, obtains the second simulating signal and exports.
Wherein, temperature detecting unit circuit (i.e. modulate circuit and temperature sensor jointly form circuit) specifically comprises: the 3rd constant pressure source, resistance R14 ~ R17 and resistance R19, temperature sensor RT1, four-operational amplifier and the 5th operational amplifier;
The first end of the output terminal difference contact resistance R15 of the 3rd constant pressure source (1.8V), the electrode input end in the power supply terminal of four-operational amplifier, and the first input end of resistance R17; The first end of the second end contact resistance R14 of resistance R15; The second end ground connection of resistance R14; The positive input terminal of four-operational amplifier is connected to the node between resistance R15 and resistance R14; The negative input end of four-operational amplifier connects the node between the output terminal of this operational amplifier and resistance R16 first end; Negative input end ground connection in the power supply terminal of four-operational amplifier;
Second end of resistance R16 is connected to the node between the negative input end of the 5th operational amplifier and resistance R19 first end;
Second end of resistance R17 is connected to the node between the positive input terminal of the 5th operational amplifier and temperature sensor RT1 first end;
The second end ground connection of temperature sensor RT1;
The output terminal of the 5th operational amplifier is connected to second end of resistance R19.
The expression of the second simulating signal Vout exported according to this circuit is shown below:
As can be seen from formula 3-1, the resistance of each resistance of Reasonable adjustment, just can be limited to output voltage in the full scale input range of 0V to A/D.This formula also illustrates beyond R17 (R17 is Low Drift Temperature resistance, and when temperature variation is larger, resistance value also changes hardly), if other each resistive elements have identical temperature coefficient, then can not affect measurement result.But R17 must select, and temperature coefficient is little, the metalfilmresistor of stable performance.The operational amplifier of Low Drift Temperature, low noise is selected to be useful for guarantee Measurement sensibility and precision.
It should be noted that, the voltage of the 3rd constant pressure source is 1.8V, this constant pressure source as the excitation power supply of temperature sensor RT1, the reference voltage of A/D converter when this constant pressure source provides temperature survey simultaneously.Such design eliminates the impact of driving source change on A/D Output rusults, thus reduces the requirement to reference power supply, improves the stability of measurement.Further, series connection resistance R17 on temperature sensor RT1, for limiting the electric current flowing through temperature sensor, reduces the measuring error that spontaneous heating causes.
Professional should recognize further, in conjunction with object and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not think the scope exceeding the application.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processing module to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
Above-described embodiment; the object of the application, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the embodiment of the application; and be not used in the protection domain limiting the application; within all spirit in the application and principle, any amendment made, equivalent replacement, improvement etc., within the protection domain that all should be included in the application.
Claims (8)
1. based on a warm depth finding device for controller local area network's CAN, it is characterized in that, described device comprises: pressure detecting module, temperature sensing module, processing module, CAN module;
Described first simulating signal for obtaining the first simulating signal, and is sent to described processing module by described pressure detecting module;
Described second simulating signal for obtaining the second simulating signal, and is sent to described processing module by described temperature sensing module;
Described processing module is used for described first simulating signal and described second simulating signal to be converted to the first digital signal and the second digital signal respectively, and described first digital signal and described second digital signal are sent to described CAN module;
Described CAN module is used for described first digital signal and described second digital signal to send to host computer.
2. device according to claim 1, is characterized in that, described pressure detecting module comprises: pressure probe unit and transmitting element;
Described pressure probe unit is for exporting described first simulating signal;
Described transmitting element is used for described first simulating signal to send to described processing module.
3. device according to claim 2, is characterized in that, described pressure probe unit comprises: pressure transducer and amplifying circuit;
Described pressure transducer is used for pressure signal to be converted to the 3rd simulating signal, and is input in described amplifying circuit by described 3rd simulating signal;
Described amplifying circuit is used for described 3rd simulating signal be converted to described first simulating signal and export.
4. device according to claim 1, is characterized in that, described temperature sensing module comprises: temperature detecting unit and transmitting element;
Described temperature detecting unit is for exporting described second simulating signal;
Described transmitting element is used for described second simulating signal to send to described processing module.
5. device according to claim 4, is characterized in that, described temperature detecting unit comprises: temperature sensor and modulate circuit;
Described temperature sensor is used for ocean temperature signal to be converted to the 4th simulating signal;
Described modulate circuit is used for described 4th simulating signal be converted to described second simulating signal and export.
6. device according to claim 1, is characterized in that, described processing module comprises: receiving element, converting unit and transmitting element;
Described receiving element is used for receiving described first simulating signal of described pressure detecting module transmission and described second simulating signal of described temperature sensing module transmission respectively;
Converting unit is used for respectively described first simulating signal and described second simulating signal being converted to the first digital signal and the second digital signal;
Transmitting element is used for described first digital signal and described second digital signal to send to described CAN module.
7. based on a warm depth sensing system for CAN, it is characterized in that, described system comprises device as claimed in claim 1 and host computer;
Described host computer for the first digital signal of receiving described CAN module and sending and the second digital signal, and respectively according to described first digital signal and described second digital signal determination ocean depth information and ocean temperature information.
8., based on a warm depth finding method for CAN, it is characterized in that, described method comprises:
Obtain the first simulating signal and the second simulating signal respectively;
Described first simulating signal and the second simulating signal are converted to the first digital signal and the second digital signal respectively;
Described first digital signal and described second digital signal is transmitted based on CAN communication protocol;
Respectively according to described first digital signal and described second digital signal, determine ocean depth information and ocean temperature information.
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| CN108334048A (en) * | 2018-05-07 | 2018-07-27 | 珠海格力电器股份有限公司 | A kind of data collecting system |
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