CN202149816U - Engine low temperature acquisition circuit - Google Patents
Engine low temperature acquisition circuit Download PDFInfo
- Publication number
- CN202149816U CN202149816U CN201120227838.6U CN201120227838U CN202149816U CN 202149816 U CN202149816 U CN 202149816U CN 201120227838 U CN201120227838 U CN 201120227838U CN 202149816 U CN202149816 U CN 202149816U
- Authority
- CN
- China
- Prior art keywords
- circuit
- sensor digital
- low temperature
- temperature acquisition
- acquisition circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The utility model relates to an engine low temperature acquisition circuit comprising a sensor digital conversion circuit used for performing conversion to a low temperature signal, wherein the sensor digital conversion circuit comprises at least two K-calibration thermocouple sensor digital converters, input ends of the sensor digital converters are used for connecting with corresponding at least two low temperature acquisition signals, data output ends of the sensor digital converters are connected to a serial bus which is used for connecting with a processor, and chip selection ends of the sensor digital converters are used for correspondingly connecting with corresponding ports of the processor. According to the engine low temperature acquisition circuit of the utility model, by adopting the K-calibration thermocouple sensor digital converter, a sensing temperature of the thermocouple can be directly converted into a digital quantity in order to be sent out from an SPI (Serial Peripheral Interface) serial port; and functions related to a general signal amplification circuit, a processing circuit, an A/D translation circuit, a serial output circuit, cold junction compensation and broken line monitoring technologies are combined into a whole and integrated into a 8-SO packaging, thus the circuit is greatly simplified, and not only measurement precision is raised, but also reliability of the system is ensured.
Description
Technical field
The utility model belongs to sensor acquisition and data processing circuit technical field, is specifically related to a kind of engine low temperature Acquisition Circuit.
Background technology
As shown in Figure 1; Want the present general method of temperature of perceptual object to be to use thermocouple sensor (K calibration) and thermal resistance sensor (PT100) to go to detect the analog quantity of actual temperature; Carry out processing and amplifying by the sensor amplifying circuit then, again the sensor actual signal is carried out the A/D conversion, and then become digital quantity and output to PC, industrial computer or microcontroller and remove record, show; By on can know concrete measurement processing link more complicated.
The utility model content
The purpose of the utility model provides a kind of engine low temperature Acquisition Circuit, to solve available engine low temperature Acquisition Circuit structure measurement processing links complicated problems.
For realizing above-mentioned purpose; The utility model adopts following technical scheme: a kind of engine low temperature Acquisition Circuit; Comprise and be used for sensor digital conversion circuit that low-temperature signal is changed; Comprise eight K type thermocouple sensor digital quantizers in the said sensor digital conversion circuit; The input end of each sensor digital quantizer is used for and corresponding octuple low temperature acquired signal connects, and the data output end of each sensor digital quantizer is connected and is used for the universal serial bus that links to each other with processor, and the sheet choosing of each sensor digital quantizer is held and is used for corresponding connection with the corresponding port of processor.
The scope of said low temperature acquired signal is 0～128 ℃.
Said K type thermocouple sensor digital quantizer adopts MAX6674.
Be connected with an input capacitor between the two-port of said K type thermocouple.
Be connected with a power filtering capacitor between the power end of said K type thermocouple sensor digital quantizer MAX6674 and the earth terminal.
The engine low temperature Acquisition Circuit of the utility model is owing to adopt K type thermocouple sensor digital quantizer; Can directly become digital quantity to the sense temperature of thermopair and see off, with general signal amplification, treatment circuit, A/D translation circuit, serial output circuit, cold junction compensation from the SPI serial port; The function that disconnection monitoring is relevant is dissolved and is one; Be integrated in the encapsulation of a 8SO, greatly simplified circuit, not only improved measuring accuracy but also guaranteed the reliability of system.
Description of drawings
Fig. 1 is the theory diagram of existing low temperature Acquisition Circuit;
Fig. 2 is the circuit theory diagrams of the utility model;
Fig. 3 is the circuit diagram of the utility model embodiment.
Embodiment
Below in conjunction with concrete embodiment the utility model is done further introduction.
Be illustrated in figure 2 as the circuit theory diagrams of the utility model; Can know by figure; This low temperature Acquisition Circuit comprises and is used for sensor digital conversion circuit that low-temperature signal is changed; Comprise at least two K type thermocouple sensor digital quantizers in the sensor digital conversion circuit; The input end of each sensor digital quantizer is used for and the corresponding low temperature of two-way at least acquired signal connects, and the data output end of each sensor digital quantizer is connected and is used for the universal serial bus that links to each other with processor, and the sheet choosing of each sensor digital quantizer is held and is used for corresponding connection with the corresponding port of processor.
In the present embodiment; The scope of low temperature acquired signal is 0～128 ℃; Be connected with an anti-interference condenser between the two-port of temperature acquisition use K type thermocouple, be connected with a power filtering capacitor between the power end of K type thermocouple sensor digital quantizer and the earth terminal.
During engine test; Parameters such as its oil temperature, inflow temperature, leaving water temperature, test ambient temperature are compared with the temperature on nozzle etc. generally all below 100 ℃, are called low-temperature measurement traditionally; When low-temperature measurement; The sensor digital conversion circuit adopts the K type thermocouple sensor digital quantizer MAX6674 of N1～N8 by the production of the U.S. U.S. letter company, and 0～128 ℃ of MAX6674 measurement range has 10 precision; Resolution is 0.125 ℃, so the circuit that we measure engine motor oil temperature, inflow temperature, leaving water temperature, test ambient temperature etc. is used MAX6674.
The MAX6674 device can directly become digital quantity to the sense temperature of thermopair to be seen off from the SPI serial port, and with cold junction compensation, the disconnection monitoring function rolls into one; Can be with general signal amplification, treatment circuit, A/D translation circuit, serial output circuit; Cold junction compensation, the function that disconnection monitoring is relevant is dissolved for one, is integrated in the encapsulation of a 8SO; Not only improve measuring accuracy but also guaranteed the reliability of system
The serial port of N1～N8 can be exported the signal after the conversion: 7 pin are data output end, and 5 pin are output terminal of clock, and 6 pin are the sheet choosing, and 5～7 pin are drawn out on the lead-out terminal respectively, so that join with related port.MAX6674 gathered and carries out the A/D conversion when 6 pin were high, output serial digital amount when low.
The power supply of this low temperature Acquisition Circuit is provided by 4 pin of N1～N8 and 5 pin and capacitor C1～C8, and 4 pin are V
CC(5V) power supply just, 1 pin is (5V) power supply ground, C1～C8 is a power filtering capacitor.
As shown in Figure 3; Present embodiment is an example with eight groups of low temperature Acquisition Circuit; The input circuit module is made up of the thermopair T1～T8 and the input capacitor C9～C16 of K calibration; Thermopair T and 1～T and the in good time temperature voltage of 8 sensings, capacitor C9～C16 is used to improve the antijamming capability of signal, to guarantee the signal voltage correctness.
+ 5V power supply is connected to the 4 pin V of N1～N8
CCWith 1 pin GND, give N1～N8 power supply from the outside, C1～C8 capacitor is connected on the 4 pin V of N1～N8 respectively
CC, and between the 1 pin GND power supply is carried out certain filtering.The 5 pin SCK of N1～N8 all are connected in parallel, and are driven by external timing signal; The 7 pin SO of N1～N8 all are connected in parallel, and transmit digital quantity through common line to the outside; The 6 pin CS of N1～N8 are connected respectively on the independent terminal, and are low with regard to corresponding this pin is put when needs detect the temperature of that sensor senses, take out the temperature digital amount from relevant chip; 6 pin of N1～N8 are in high level and are gathering always at ordinary times, only put and just can read digital quantity when low; As when outside 6 pin to N1 place 0 level, 7 pin of N1 will be seen the temperature digital amount of TH1 perception off through public SO line.When in like manner 6 pin of N2～N8 being placed 0 level respectively, external units such as processor will obtain the temperature digital amount that N1～N8 serial is seen off, accomplish the detection and the supervision of 8 temperature.
This novel employing technique scheme reaches following technique effect:
(1) owing to adopts K type thermocouple sensor digital quantizer; Can directly become digital quantity to the sense temperature of thermopair sees off from the SPI serial port; And with general signal amplification, treatment circuit, A/D translation circuit, serial output circuit, cold junction compensation, the function that disconnection monitoring is relevant combines together; Be integrated in the encapsulation of a 8SO, greatly simplified circuit.
(2) not only improve measuring accuracy but also guaranteed the reliability of system.
(3) every K type thermocouple sensor digital quantizer price is between 25 yuan-30 yuan, and cost performance is far above the existing product in present any market.
Claims (5)
1. engine low temperature Acquisition Circuit; It is characterized in that: comprise being used for sensor digital conversion circuit that low-temperature signal is changed; Comprise at least two K type thermocouple sensor digital quantizers in the said sensor digital conversion circuit; The input end of each sensor digital quantizer is used for connecting with the corresponding low temperature of two-way at least acquired signal; The data output end of each sensor digital quantizer is connected and is used for the universal serial bus that links to each other with processor, and the sheet choosing end of each sensor digital quantizer is used for corresponding connection with the corresponding port of processor.
2. engine low temperature Acquisition Circuit according to claim 1 is characterized in that: the scope of said low-temperature signal is 0～128 ℃.
3. the engine low temperature Acquisition Circuit of stating according to claim 2 is characterized in that: said K type thermocouple sensor digital quantizer adopts MAX6674.
4. the engine low temperature Acquisition Circuit of stating according to claim 3 is characterized in that: be connected with an input capacitor between the two-port of said K type thermocouple.
5. according to claim 3 or 4 described engine low temperature Acquisition Circuit, it is characterized in that: be connected with a power filtering capacitor between the power end of said K type thermocouple sensor digital quantizer MAX6674 and the earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120227838.6U CN202149816U (en) | 2011-06-30 | 2011-06-30 | Engine low temperature acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120227838.6U CN202149816U (en) | 2011-06-30 | 2011-06-30 | Engine low temperature acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202149816U true CN202149816U (en) | 2012-02-22 |
Family
ID=45590871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120227838.6U Expired - Lifetime CN202149816U (en) | 2011-06-30 | 2011-06-30 | Engine low temperature acquisition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202149816U (en) |
-
2011
- 2011-06-30 CN CN201120227838.6U patent/CN202149816U/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105259841B (en) | A kind of industrial many reference amounts data acquisition unit | |
| CN202149816U (en) | Engine low temperature acquisition circuit | |
| CN204479558U (en) | Intelligent gas acquisition probe | |
| CN202836816U (en) | Multipoint temperature measurement circuit | |
| CN203869730U (en) | Circuit breaker operating mechanism temperature and pressure detection and transmission system based on wireless communication | |
| CN202886003U (en) | Intelligent multichannel temperature collection instrument | |
| CN202149815U (en) | Engine temperature collection circuit | |
| CN202403821U (en) | Temperature measuring device for engine | |
| CN202956210U (en) | Temperature sensor circuit structure based on single wire connection | |
| CN201575866U (en) | Temperature collecting and recording device | |
| CN103868617A (en) | Platinum resistor temperature measuring circuit | |
| CN204389714U (en) | A kind of weather monitoring instrument realizing Temperature and Humidity based on SHT2X chip | |
| CN203216569U (en) | High-precision underground water level monitoring device | |
| CN2676169Y (en) | Wireless communication type tester for screw pump well | |
| CN202631191U (en) | Pressure meter measuring instrument | |
| CN202267604U (en) | Engine pressure collection circuit | |
| CN202256238U (en) | Portable edible oil quality test device | |
| CN202083554U (en) | Multi-path temperature pressure on-line monitoring system | |
| CN201795876U (en) | Digital thermometer | |
| CN205006871U (en) | Digital body temperature probe and device | |
| CN209894358U (en) | Temperature detection device of solar water heating system | |
| CN202916726U (en) | One-wire temperature collection system based on DS18B20 temperature sensor | |
| CN204988565U (en) | Capacitanc pressure transmitter | |
| CN204269151U (en) | A kind of ice and snow sensor integrated morphology | |
| CN204115901U (en) | Electric thermo-couple temperature collection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120222 |