CN202929833U - Controller area network (CAN) bus transmission temperature sensor circuit - Google Patents
Controller area network (CAN) bus transmission temperature sensor circuit Download PDFInfo
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- CN202929833U CN202929833U CN 201220528558 CN201220528558U CN202929833U CN 202929833 U CN202929833 U CN 202929833U CN 201220528558 CN201220528558 CN 201220528558 CN 201220528558 U CN201220528558 U CN 201220528558U CN 202929833 U CN202929833 U CN 202929833U
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- conversion circuit
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- temperature
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Abstract
The utility model relates to a controller area network (CAN) bus transmission temperature sensor circuit which comprises a sensor digital conversion circuit used for converting temperature signals and a control device used for processing the measured temperature, wherein the control device is an electronic control unit (ECU) singlechip digital intelligent processor and is internally provided with a single program initiation (SPI) serial port module in communication connection with the sensor digital conversion circuit, a singlechip central processing unit (CPU) and a CAN module of the singlechip CPU; the sensor digital conversion circuit is to be connected with an external temperature sensor; a data output end of the SPI serial port module is connected with the singlechip CPU; a chip selection end of the sensor digital conversion circuit is connected with a corresponding port of the singlechip CPU correspondingly; the temperature sensor circuit further comprises a CAN bus driver to be connected with a CAN network; and the CAN bus driver is connected with the singlechip CPU by the CAN module. The CAN bus transmission temperature sensor circuit solves the problems that the existing temperature sensor is not capable of directly carrying out serial data exchange, and the temperature sensor is differently match with a vehicle ECU.
Description
Technical field
The utility model relates to a kind of CAN bus transfer temperature probe circuit.
Background technology
application number is one piece of patent documentation " a kind of engine temperature measurement mechanism " of 201120485348.6, as shown in Figure 1, this device comprises for the sensor digital conversion circuit that temperature signal is changed, this sensor digital conversion circuit comprises thermocouple sensor and the sensor digital quantizer MAX31855 of eight different calibration, the input end of each sensor digital conversion circuit is used for connecting with eight road corresponding temperature acquisition signals, the data output end of each sensor digital quantizer is connected to the universal serial bus that is connected for processor, the sheet choosing end of each sensor digital quantizer is used for connection corresponding to the corresponding port of processor industrial computer, because the vehicle-mounted ECU system of existing automobile all adopts the CAN bus, supporting more difficult between the utility model temperature measuring equipment and vehicle-mounted ECU.
The utility model content
The purpose of this utility model is to provide a kind of CAN bus transfer temperature probe circuit, can not directly carry out serial data exchange, the supporting hard problem between sensor and vehicle-mounted ECU in order to solve existing temperature sensor.
for achieving the above object, scheme of the present utility model is: a kind of CAN bus transfer temperature probe circuit, the control device that comprises for the sensor digital conversion circuit that temperature signal is changed and be used for dut temperature is processed, be provided with the SPI serial port module that is connected with the communication of sensor digital conversion circuit in control device, described sensor digital conversion circuit is used for connecting outside temperature sensor, described control device is ECU single-chip microcomputer digital intelligent processor, comprise a singlechip CPU and CAN module thereof, the data output end of described SPI serial port module is connected with singlechip CPU, the sheet choosing end connection corresponding to the corresponding port of singlechip CPU of described sensor digital conversion circuit, this temperature probe circuit comprises that also for the CAN bus driver that connects the CAN network, described CAN bus driver is connected with described singlechip CPU by the CAN module.
Described sensor digital conversion circuit is MAX6675 sensor digital quantizer.
Described CAN bus driver is the CTM1050T driver.
Described ECU single-chip microcomputer digital intelligent is treated to digital signal controller DSPIC30F4013.
Described temperature sensor is the thermocouple sensor of armouring K calibration.
The temperature measurement range of this transmission temperature probe is 0 ℃～1024 ℃.
The beneficial effect that the utility model reaches: the utility model is sent the temperature signal that temperature sensor collects with CAN bus serial mode, system all adopts the CAN bus due to vehicle-mounted ECU, has solved in present automotive engineering progress supporting hard problem between existing sensor and vehicle-mounted ECU.
Description of drawings
Fig. 1 is the functional-block diagram of existing temperature measuring equipment;
Fig. 2 is the utility model CAN bus transfer temperature probe circuit block diagram;
Fig. 3 is the utility model embodiment circuit block diagram;
Fig. 4 is the utility model CAN bus transfer temperature probe circuit theory diagrams.
Embodiment
The utility model is described in more detail below in conjunction with accompanying drawing.
as Fig. 2, the utility model comprises temperature sensor, the sensor digital conversion circuit, ECU single-chip microcomputer digital intelligent processor and bus driver, the input end of sensor digital conversion circuit connects the output terminal of temperature sensor, its data output end connects the SPI serial port module of ECU single-chip microcomputer digital intelligent processor, its sheet choosing end connects the I/O mouth of single-chip microcomputer ECU, when this sensor digital conversion circuit is not selected, carry out collection and the A/D conversion of temperature signal, when selected, be used for output serial digital amount, temperature sensor is used for the temperature of perception testee, and temperature signal is exported to the sensor digital conversion circuit, the sensor digital conversion circuit is used for temperature signal is converted to digital quantity, and export to the SPI serial port module of ECU single-chip microcomputer digital intelligent processor, ECU single-chip microcomputer digital intelligent processor is controlled temperature on the one hand in good time, again actual temperature is outputed to CAN bus driver input port from the CAN module port on the other hand, the CAN bus driver connects together subsystem and bus system or Local Area Network, be used for dut temperature is exported to the CAN bus system.
As Fig. 3, in the present embodiment, temperature sensor adopts armouring K type thermocouple sensor, the sensor digital conversion circuit adopts MAX6675 sensor digital quantizer, ECU Intelligent Single-Chip Based processor adopting digital signal controller DSPIC30F4013, the CAN bus driver adopts the CTM1050T driver.
As Fig. 4, K type thermocouple sensor is a temperature sensor that is used for sense temperature, be connected with input circuit between its output terminal (T1-and T1+) and MAX6675 sensor digital quantizer input end (T-and T+), this input circuit comprises capacitor (5C1 ~ 5C3), inductor (L1 ~ L2) and two-way Transient Suppression Diode TVS1, be used for the signal transmission relation between coordination temperature sensor and sensor digital conversion circuit, capacitor, inductor are used for filtering interference signals, and TVS1 causes damage to input circuit for preventing that transient overvoltage from causing.
The measurement range of MAX6675 is 0 ℃～1024 ℃, has 12 precision, and resolution is 0.25 ℃.Be directly changed into digital quantity for the sense temperature with K type thermocouple sensor and send from the SPI serial port, 2,3 pin are input end, are the signal output parts of K type thermocouple sensor, and 4 pin are V
CC(5V) power supply just, 1 pin is (GED) power supply ground, connects respectively+5V power supply and GND.7 pin are data output end, and 5 pin are the defeated end of clock, and 6 pin are sheet choosing, and 5～7 pin are received respectively on 24 pin (SCK1/RF5), 4 pin (SS1/RB2), 26 pin (SDI1/RF2) pin of digital signal controller DSPIC30F4013.
Digital signal controller DSPIC30F4013
,Be a kind of 16 high performance digital signal controllers, it comprises 1 2.0B CAN interface module, 1 SPI serial port module, 2 UART interfaces and an I2C module.N3 is connected with MAX6675 by the SPI serial port module, and the temperature of the testee that acceptance is exported by input circuit is when 4 pin of N3 when being high, MAX6675 carries out temperature signal collection and carries out the A/D conversion, when 4 pin of N3 were low, MAX6675 was selected, output serial digital amount.
The CAN module is an interface module, the digital quantity of DSPIC30F4013 output is from the 29(C1TX/RF1 of CAN module interface) pin and 30(C1RX/RF0) pin delivers to respectively 1 pin (TXD) and 4 pin (RXD) of bus driver module CTM1050T, then 1 pin (TXD) and the 1 pin 4(RXD by bus driver module CTM1050T again) be defeated by the upper level system, thereby realized the sensor of CAN bus transfer.
C9, C10 and crystal oscillator XTAL form crystal-oscillator circuit, for single-chip microcomputer provides clock source.C13, C14, R2, R3 and reset switch S form on-off circuit, debug and trouble shooting with convenient production.Socket J1 is the online programming port, and its 1 to 5 pin joins with 1 pin (MCLR) of single-chip microcomputer, power supply+5V, GEN, 8 pin (PGC) of single-chip microcomputer, 9 pin (PGD) of single-chip microcomputer respectively, makes system can realize online programming.C6～C8, C11～C14,4C1 is power filtering capacitor, and the interference that power supply is brought into plays the filtering effect.
the Main Function of CAN bus driver is that subsystem and bus system or Local Area Network are connected together, CANH, the CANL pin is connected on 7 and 6 corresponding pins of CTM1050T driver, can carry out digital transmission and process of the test monitoring with 110 peripheral hardwares, pass through CANH, the CANL pin, the CTM1050T driver is sent the temperature of testee to network, the CTM1050T driver is with TJ1050, high-speed light is even, the DC/DC buffer circuit, esd protection, the anti-overvoltage Transient Suppression Diode of TVS integrates, both isolated external interference, protected again the normal operation of circuit, reliability to system has played very important effect.
Power circuit by integrated package of pressure-stabilizing 7812,7805 and diode D1, capacitor C1 ~ C5, resistor R1 and Self-Righting Insurance F1, F2 form.Vehicle power 24V positive terminal is connected successively with diode D1, Self-Righting Insurance F1, then is connected to 7812 1 pin after the step-down current limliting of resistor R1, and is supplied with 3 pin ground connection of integrated package of pressure-stabilizing 7805,7812 by 7812 2 pin output 12V voltages.Capacitor C2, C3 are connected in parallel between 7805 1 pin and ground; 12V power supply 2 pin from 7805 after C2, C3 filtering are exported the 5V voltages; capacitor C4, C5 are connected in parallel between 7805 2 pin and ground; output voltage is carried out filtering; filtered voltage uses through Self-Righting Insurance F2 series connection output supply circuit; in case single-chip microcomputer and electronic circuit break down, the resistance of Self-Righting Insurance F2 constantly raises and then has just played protective effect.The voltage that integrated package of pressure-stabilizing 7812 input 24V send into is exported again 12V voltage and is supplied with 7805, and 24V and 5V voltage are played an over effect, improves 7805 stability and reliability.
When vehicle power was 12V, the J3 two-terminal disconnected, and vehicle power 12V power supply is defeated by 7805 1 pin through C2, C3 filtering, and 7805 2 pin output voltages are through C4, C5 filtering, and process Self-Righting Insurance F2 output 5V voltage is whole circuit supply.Therefore no matter be 24V or 12V Power supply, circuit can be worked.
in the present embodiment, digital signal controller DSPIC30F4013 has only connected a sensor digital quantizer, in other embodiments, because digital signal controller DSPIC30F4013 can provide 24 I/O mouths, can 1 ~ 24 sensor digital quantizer in parallel in its SPI serial port module, each I/O pin can be controlled the sheet choosing of a sensor digital quantizer, when sheet is elected low level as, corresponding sensor digital quantizer is selected, the CAN bus driver is sent the temperature of this road testee to network, can complete the measurement of 1 ~ 24 object temperature, can satisfy general automotive temp and measure the requirement of quantity.
Claims (6)
1. CAN bus transfer temperature probe circuit, the control device that comprises for the sensor digital conversion circuit that temperature signal is changed and be used for dut temperature is processed, be provided with the SPI serial port module that is connected with the communication of sensor digital conversion circuit in control device, described sensor digital conversion circuit is used for connecting outside temperature sensor, it is characterized in that, described control device is ECU single-chip microcomputer digital intelligent processor, comprise a singlechip CPU and CAN module thereof, the data output end of described SPI serial port module is connected with singlechip CPU, the sheet choosing end connection corresponding to the corresponding port of singlechip CPU of described sensor digital conversion circuit, this temperature probe circuit comprises that also for the CAN bus driver that connects the CAN network, described CAN bus driver is connected with described singlechip CPU by the CAN module.
2. CAN bus transfer temperature probe circuit according to claim 1, is characterized in that, described sensor digital conversion circuit is MAX6675 sensor digital quantizer.
3. CAN bus transfer temperature probe circuit according to claim 1, is characterized in that, described CAN bus driver is the CTM1050T driver.
4. CAN bus transfer temperature probe circuit according to claim 1, is characterized in that, described ECU single-chip microcomputer digital intelligent processor is digital signal controller DSPIC30F4013.
5. CAN bus transfer temperature probe circuit according to claim 1, is characterized in that, described temperature sensor is the thermocouple sensor of armouring K calibration.
6. CAN bus transfer temperature probe circuit according to claim 1, is characterized in that, the temperature measurement range of this transmission temperature probe is 0 ℃～1024 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220528558 CN202929833U (en) | 2012-10-16 | 2012-10-16 | Controller area network (CAN) bus transmission temperature sensor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220528558 CN202929833U (en) | 2012-10-16 | 2012-10-16 | Controller area network (CAN) bus transmission temperature sensor circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202929833U true CN202929833U (en) | 2013-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220528558 Expired - Lifetime CN202929833U (en) | 2012-10-16 | 2012-10-16 | Controller area network (CAN) bus transmission temperature sensor circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108762234A (en) * | 2018-06-11 | 2018-11-06 | 北京经纬恒润科技有限公司 | A kind of car body controller and its control method |
| CN113324677A (en) * | 2021-05-18 | 2021-08-31 | 佛山市顺德区凯祥电器有限公司 | Intelligent thermocouple control circuit |
-
2012
- 2012-10-16 CN CN 201220528558 patent/CN202929833U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108762234A (en) * | 2018-06-11 | 2018-11-06 | 北京经纬恒润科技有限公司 | A kind of car body controller and its control method |
| CN113324677A (en) * | 2021-05-18 | 2021-08-31 | 佛山市顺德区凯祥电器有限公司 | Intelligent thermocouple control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130508 |
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| CX01 | Expiry of patent term |