CN207923309U - A kind of K idol temperature-measuring modules for diesel engine monitoring system - Google Patents
A kind of K idol temperature-measuring modules for diesel engine monitoring system Download PDFInfo
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- CN207923309U CN207923309U CN201721478143.9U CN201721478143U CN207923309U CN 207923309 U CN207923309 U CN 207923309U CN 201721478143 U CN201721478143 U CN 201721478143U CN 207923309 U CN207923309 U CN 207923309U
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Abstract
A kind of K idol temperature-measuring modules for diesel engine monitoring system, including shell（1）, 10 road k type thermocouple sensor inputs A（2）, debugging mouth（3）, power inlet（4）, 10 road k type thermocouple sensor inputs B（5）, RS485 communication interfaces（6）, first via CAN communication interface（7）, the second tunnel CAN communication interface（8）And printed circuit board, in the shell（1）Cavity in be equipped with printed circuit board, input processing circuit, MCU circuits, toggle switch, RS485 driving circuits, first via CAN driving circuits and the second road CAN driving circuits are respectively equipped on the printed circuit board, the input processing circuit includes 20 road K indexing thermocouples signal filter circuit, No. 16 analog multiplexers, six amplifying circuits, cold junction temperature sensor and its driving circuit.The utility model may be implemented the measurement to 20 road K type thermocouple input signals, 0~800 DEG C of measurement range, and measurement result is sent out by RS485 buses or CAN bus, and set that there are one 4 toggle switch as address selection input.
Description
Technical field
The utility model is related to a kind of K idols temperature-measuring modules, and in particular to a kind of K for diesel engine monitoring system is even
Temperature-measuring module.
Background technology
Known, as diesel engine monitoring system intelligent degree is higher and higher, the quantity of diesel engine measuring point is also increasingly
More, for this variation tendency, applicant devises a kind of diesel engine monitoring system of dual CAN bus framework, compares previous general
All over the RS485 communications used, which carries out internal exchange of data using double CAN networks, increases substantially communication speed
Application with double CAN networks of redundancy while data volume also enhances the reliability of monitoring system.
The diesel engine monitoring system function of dual CAN bus framework sets up flexible form, including basic composition and extension composition
Two parts, basic composition can meet most diesel engine single machine monitoring demand, extension composition can selective additions and deletions wherein
Function module so that monitoring system is met the monitoring application demand of the different complete set of equipments such as main propeller machine group, generating set.
K idol temperature-measuring modules are one of critical components in extension composition, must satisfy the application demand of dual CAN bus framework, right
The single cylinder delivery temperature of the High speed and heavy duty diesel engine of maximum 20 cylinders measures, and therefore, exploitation is a kind of to be used for diesel engine monitoring system
K idols temperature-measuring module just at the necessary technology demand of those skilled in the art.
Invention content
Insufficient present in background technology to overcome, the utility model provides a kind of K for diesel engine monitoring system
The measurement to 20 road K type thermocouple input signals may be implemented in even temperature-measuring module, the utility model, can be used for maximum 20
The single cylinder delivery temperature of the High speed and heavy duty diesel engine of cylinder measures.
To realize that goal of the invention as described above, the utility model use technical solution as described below：
A kind of K idol temperature-measuring modules for diesel engine monitoring system, including shell, 10 road k type thermocouples sensings
Device input interface A, debugging mouth, power inlet, 10 road k type thermocouple sensor input B, RS485 communication interfaces,
CAN communication interface, the second tunnel CAN communication interface and printed circuit board all the way are equipped with printed circuit in the cavity of the shell
Plate is respectively equipped with input processing circuit, MCU circuits, toggle switch, RS485 driving circuits, first on the printed circuit board
Road CAN driving circuits and the second road CAN driving circuits, the input terminal of the MCU circuits are separately connected toggle switch and input
The output end of circuit is managed, the output end of MCU circuits is separately connected RS485 driving circuits, first via CAN driving circuits and the second tunnel
The input terminal of CAN driving circuits, input processing circuit, MCU circuits, RS485 driving circuits, first via CAN driving circuits and
Two road CAN driving circuits are separately connected power circuit, and 10 road k type thermocouple sensors are respectively equipped on the front panel of shell
Input interface A, debugging mouth, power inlet, 10 road k type thermocouple sensor input B, RS485 communication interfaces, first
Road CAN communication interface and the second tunnel CAN communication interface, the RS485 communication interfaces, first via CAN communication interface and the second tunnel
CAN communication interface is separately connected the communication bus of RS485, first via CAN and the second road CAN, the connection power supply electricity of power inlet 4
Source, debugging mouth connect commissioning device, and 10 road k type thermocouple sensor input A and 10 road k type thermocouple sensors are defeated
Incoming interface B is separately connected 20 road K indexing thermocouple sensors and forms the K idol temperature measurement mould for diesel engine monitoring system
Block.
The K idol temperature-measuring modules for diesel engine monitoring system, the input processing circuit include 20 road K points
Spend thermocouple signal filter circuit, No. 16 analog multiplexers, six amplifying circuits, cold junction temperature sensor and its driving
Circuit, No. 16 analog multiplexer select ADG506AKR, and the amplifier of the amplifying circuit selects AD8608, and described 20
The input terminal of road K indexing thermocouple signal filter circuits is separately connected 20 K indexing thermocouples, wherein 16 road K indexing thermocouple signal filters
Wave circuit output end connects the input terminal of No. 16 analog multiplexers, the output end connection of No. 16 analog multiplexer
The output end of the input terminal of amplifying circuit all the way, other four 4 road K indexing thermocouple signal filter circuits is separately connected four amplifications
The input terminal of circuit, the input terminal of the output end connection cold junction temperature sensor drive driving circuit of the cold junction temperature sensor, institute
State cold junction temperature sensor drive driving circuit output end connect an amplifying circuit input terminal, six amplifying circuits it is defeated
Outlet is separately connected MCU.
The K idol temperature-measuring modules for diesel engine monitoring system, the power circuit are isolated DC electricity
Source conversion regime, permission power supply voltage range are 9~36V.
The K idol temperature-measuring modules for diesel engine monitoring system, the measuring temperature range of the K indexing thermocouple
It it is 0~800 DEG C, measurement accuracy is ± 1%.
The K idol temperature-measuring modules for diesel engine monitoring system, the MCU select 16 processing of Freescale
Device 9S12XET256.
The K idol temperature-measuring modules for diesel engine monitoring system, the printed circuit board are bolted
In shell.
Using technical solution as described above, the utility model has superiority as described below：
The measurement to 20 road K type thermocouple input signals may be implemented in the utility model, and 0~800 DEG C of measurement range is surveyed
It measures result to send out by RS485 buses or CAN bus, and sets that there are one 4 toggle switch as address selection input,
The single cylinder delivery temperature that can be used for the High speed and heavy duty diesel engine of maximum 20 cylinders measures, and the utility model has simple in structure, behaviour
The features such as making to facilitate is suitble in High speed and heavy duty diesel engine monitoring field promotion and application.
Description of the drawings
Fig. 1 is the layout structure schematic diagram of panel in the utility model；
Fig. 2 is the principles of the present invention Organization Chart；
Fig. 3 is the principle schematic of input processing circuit in the utility model；
Fig. 4 is the schematic diagram of multi channel selecting and amplifying circuit in the utility model；
Fig. 5 is the schematic diagram of data processing in the utility model；
Fig. 6 is temperature in the utility model-temperature corrected value phasing meter schematic diagram；
Fig. 7 is LM2576 application circuits schematic diagram in the utility model；
Fig. 8 is LM2940 application circuits schematic diagram in the utility model；
In figure：1, shell；2,10 road k type thermocouple sensor inputs A；3, debugging mouth；4, power inlet；
5,10 road k type thermocouple sensor inputs B；6, RS485 communication interfaces；7, first via CAN communication interface；8, the second tunnel
CAN communication interface.
Specific implementation mode
The utility model can be explained in more detail by the following examples, the utility model is not limited to following
Embodiment；
A kind of K idol temperature-measuring modules for diesel engine monitoring system in conjunction with described in attached drawing 1~8, including shell 1,
10 road k type thermocouple sensor inputs A2, debugging mouth 3, power inlet 4,10 road k type thermocouple sensors inputs
Interface B5, RS485 communication interface 6, first via CAN communication interface 7, the second tunnel CAN communication interface 8 and printed circuit board, in institute
State and be equipped with printed circuit board in the cavity of shell 1, be respectively equipped on the printed circuit board input processing circuit, MCU circuits,
Toggle switch, RS485 driving circuits, first via CAN driving circuits and the second road CAN driving circuits, the input of the MCU circuits
End is separately connected the output end of toggle switch and input processing circuit, and the output end of MCU circuits is separately connected RS485 driving electricity
Road, first via CAN driving circuits and the second road CAN driving circuits input terminal, input processing circuit, MCU circuits, RS485 drive
Dynamic circuit, first via CAN driving circuits and the second road CAN driving circuits are separately connected power circuit, on the front panel of shell 1
10 road k type thermocouple sensor inputs A2, debugging mouth 3, power inlet 4,10 road k type thermocouples are respectively equipped with to pass
Sensor input interface B5, RS485 communication interface 6, first via CAN communication interface 7 and the second tunnel CAN communication interface 8, it is described
RS485 communication interfaces 6, first via CAN communication interface 7 and the second tunnel CAN communication interface 8 are separately connected RS485, first via CAN
With the communication bus of the second road CAN, power inlet 4 connects power supply, and debugging mouth 3 connects commissioning device, 10 road k indexing heat
Thermocouple sensor input interface A2 and 10 road k type thermocouple sensor inputs B5 is separately connected 20 road K indexing thermocouples and passes
Sensor forms the K idol temperature-measuring modules for diesel engine monitoring system.
Wherein input processing circuit include 20 road K indexing thermocouple signal filter circuit, No. 16 analog multiplexers,
Six amplifying circuits, cold junction temperature sensor and its driving circuit, No. 16 analog multiplexer select ADG506AKR,
The amplifier of the amplifying circuit selects AD8608, the input terminal of the 20 road K indexing thermocouple signal filter circuit to be separately connected 20
A K indexes thermocouple, wherein 16 road K indexing thermocouple signal filter circuit output ends connect the input of No. 16 analog multiplexers
End, the output end of No. 16 analog multiplexer connect the input terminal of amplifying circuit all the way, other four 4 road K indexing heat
The output end of even signal filter circuit is separately connected the input terminal of four amplifying circuits, the output end of the cold junction temperature sensor
The input terminal of cold junction temperature sensor drive driving circuit is connected, the output end of the cold junction temperature sensor drive driving circuit connects one
The output end of the input terminal of amplifying circuit, six amplifying circuits is separately connected MCU.
Further, the power circuit is isolated DC power supply conversion regime, and permission power supply voltage range is 9~36V.
Further, ranging from 0~800 DEG C of the measuring temperature of the K indexing thermocouple, measurement accuracy are ± 1%.
Further, the MCU selects 16 bit processor 9S12XET256 of Freescale.
Further, the printed circuit board is bolted in shell 1.
Specific embodiment of the present utility model is as follows：
The utility model is special temperature-measuring module, and the survey to 20 road K type thermocouple input signals may be implemented
Amount, 0~800 DEG C of measurement range, measurement result are sent out by RS485 buses or CAN bus.And it sets and is opened there are one 4 dial-ups
It closes as address selection input.The interface configuration of module is as shown in table 1.Specific panel layout is as shown in Figure 1.
1 interface allocation list of table
The principles of the present invention framework is as shown in Fig. 2, input processing circuit is mainly completed to 20 road K type thermocouples letters
Number filtering gating and amplification, and the acquisition to thermocouple cold junction.MCU circuits are completed:AD conversion, temperature value calculate,
Cold-junction compensation, digital filtering, calibration of the output results, the encapsulation of communication data and transmission etc..Communication driving circuit is matched with MCU circuits
It closes and completes bus communication.Power circuit provides required power supply for each circuit in module.
The principles of the present invention design is as follows：
1, input processing circuit：
The principle signal of input processing circuit is as shown in Figure 3.K indexes thermocouple signal and meets 4.7uF by meeting when entering circuit
Filter capacitor carry out hardware filtering, it is logical in the 6 tunnel AD conversion for only taking up MCU by using 1 No. 16 analog multiplexer
The acquisition that 20 road K are indexed with thermocouple input signal is realized in the case of road.AD conversion channel number with MCU performances and price
Be closely related, the reduction in required AD conversion channel means can to select the lower MCU of price to meet design needs, reduce at
This raising cost performance.No. 16 analog multiplexers select ADG506AKR, the device to may be implemented multiple to the multichannel of 16 road signals
With.
The range of K type thermocouple signals is millivolt level, by 0~800 DEG C of calculating of measuring unit detection range, signal
Voltage value is 0 between 33.277mV, and the reference voltage in the AD conversion channel of MCU is 5V, defeated in order to improve the precision of measurement
The voltage max for entering MCU should be as consistent with AD reference voltages as possible, therefore enters MCU in K type thermocouple signals and carry out AD turns
It must be amplified before changing.It is actually the specific such as figure to selecting 1 output to be amplified by the 16 of ADG506 in circuit
Shown in 4.R61, R62 and U7A collectively constitute amplifying circuit, amplification factor 140, and it is single electricity that U7A, which selects amplifier AD8608, the device,
The rail-to-rail operational amplifier in four tunnel of source, the design of single supply can reduce the complexity of electric supply system design, and rail-to-rail
Design keep output voltage range very close or be no better than supply voltage.The amplified voltage range into MCU
0 between 4.7V, close to the full scale of AD conversion.
K type thermocouple sensor measurements be temperature spot to be measured and cold end temperature difference, theoretically cold junction temperature should protect
It holds at 0 DEG C, but actual cold junction temperature can be influenced by room temperature, is follow-up it is therefore necessary to be acquired to cold junction temperature
Cold junction compensation is prepared.
LM35D would generally be selected as cold junction temperature sensor, but to realize the cold end temperature of -50 DEG C to 100 DEG C ranges
Degree measure, it is necessary to for LM35D simultaneously positive supply and negative supply are provided, this can increase the complexity of circuit and increase circuit at
Therefore this selects PT1000 as cold junction temperature sensor here, PT1000 only needs single supply power supply to can be realized -50 DEG C
Cold junction temperature to 100 DEG C of ranges measures.
2, MCU data processings
MCU is the core devices of K type thermocouple temperature-measuring modules, and K idols signal and cold junction temperature signal are amplified
Into MCU, MCU carries out data processing to it can just obtain correct temperature value.MCU selects 16 bit processor of Freescale
9S12XET256, the chip have the AD conversion module of 8 Channel 12-Bit precision, 2 SCI interfaces and 3 CAN interfaces.Inside MCU
Data processing includes that physical model reduction, error correction and encapsulation are sent.As shown in Figure 5.
Physical model reduction refers to the conversion from AD sampled value to temperature value.It includes following three step：
First, MCU control multiplexer switch ADG506 gate 16 road K idol signals successively, while controlling internal AD and completing
AD samplings to 21 road signals.The K type thermocouple signals that wherein 20 tunnels are an externally input, 1 tunnel are the cold end of PT1000 inputs
Temperature signal.
Second, K idol temperature is calculated using characteristic curve piecewise approximation.The characteristic curve of K type thermocouples is non-linear
, in the case of known K idols sensor output voltage to calculate corresponding temperature value, it will usually using following approximate formula into
Row calculates.
In formula, Vin is K occasionally output electromotive force, and Tout is corresponding temperature value.
Either square operation or floating point arithmetic can all consume MCU a large amount of processing times, it is contemplated that K idol temperature is surveyed
Amount module will realize that 20 tunnel signal detections, cumulative time will be considerable in the single treatment period, and worst situation can be tight
Ghost image rings the external response time of temperature-measuring module.Therefore use characteristic curve piecewise approximation, i.e., it will for interval with 100 DEG C
K type thermocouples characteristic curve is divided into 8 areas within the scope of 0 DEG C~800 DEG C, and the characteristic curve between two adjacent temperature is recognized
To be linear, it is possible thereby to determine " voltage-temperature " slope in each region, corresponding temperature can be calculated according to triangle theorem
Angle value.This method calculates error compared with approximate formula and is less than 1 DEG C.
Third carries out cold junction compensation, i.e., by K idols temperature value and PT1000 cold junction temperature value phases to calculated temperature value
Add.
Due to the influence of the individual difference of circuit element, ambient temperature etc., result of calculation there may be certain error,
Therefore it needs to be corrected it, MCU is corrected temperature value with the method for linear interpolation using tabling look-up.Specific bearing calibration
It is as follows：The table of comparisons of a temperature-temperature correction value is established in MCU first（See Fig. 6）, then used and inserted according to the regions T
Value method temperature correction value TJc, is finally corrected result of calculation using TJc.
In order to inhibit interference of the PERIODIC INTERFERENCE to result of calculation, the smoothness of measurement result is improved, to temperature after correction
Value carries out recurrence average filtering.Specific method is：Same channel, continuously N number of temperature value regards the data of a queue, queue as
Length be fixed as N, obtain a new data every time and be just put into tail of the queue, and throw away a data of original head of the queue（First in first out
Principle）, arithmetic average operation is carried out to N number of data in queue, so that it may which filter result needed for obtaining, the value will be used as and measure knot
Fruit sends after communication bus encapsulates.
It selects to carry out with floating number format during MCU is calculated, it in this way can be to avoid when using fixed-point number pairs
Process variable interception it is improper caused by computational solution precision reduction, meanwhile, for the ease of carry out data interaction, data encapsulate
Before transmission, it is converted into fixed-point number by floating number, it is contemplated that be accurate to the requirement of one decimal place to measurement result, pinpoint
Number will retain 2 significant digits.
3, bus communication：
It is only integrated with the function of SCI and CAN controller inside MCU, physical layer driving cannot be provided, so actually using
When also need to by being connected with bus after transceiving driver.Select CTM8251D with the two-way CAN transceiver of isolation respectively here
The driving chip of chip and RSM485 isolated transceivers chip as physical layer, they have on the basis of realizing transceiver function
There is the characteristic of isolation, electrostatic protection, electromagnetism interference and Anti-surging.
When by RS485 buses with external progress information exchange, K idol temperature-measuring modules follow Modbus-RTU agreements
And work is in a half-duplex mode, transmission rate 9600bps；When by CAN bus with external progress information exchange, K is even
Temperature-measuring module follows the customized CAN application protocols for having redundant ability, transmission rate 250Kbps.Its network section
Dot address can be configured by toggle switch.
4, power circuit：
The supply voltage of K idol temperature-measuring modules is DC24V, and operating voltage needed for component is respectively for totally two kinds in system
12V and 5V.The 24V voltages of input can be converted to the operating voltage needed for component by power circuit.Here LM2576 is selected
It realizes the conversion of 24V to 12V, LM2940 is selected to realize the conversion of 12V to 5V.
Switching regulator LM2576 has the characteristics of efficient, small power consumption, it has the wide input voltage range of 8~30V,
The adaptability of module is improved, application circuit is as shown in Figure 7.Unilateral diode, NTC resistance, common mode have been used in circuit
The protection elements such as inductance, varistor, have it is anti-reverse, anti-booting moment dash current, anti-common mode interference and Anti-surging work(
Energy.The output of linear voltage regulator LM2940 has good flatness, can be that amplifying circuit, MCU operating circuits etc. are related to
The Important Circuit of measurement result accuracy provides the working power of high-quality, ensures the stabilization of measurement result from power supply, reduces
Error.Its application circuit is as shown in Figure 8.
Monolithic printed circuit board, outside is used to be encapsulated using aluminum hull inside the utility model, screw installation, terminal, which is selected, to be inserted
Crimping terminal is pulled out, shape is as shown in Figure 1.Appearance and size is 170 mm × 102 mm × 30mm.
The non-detailed portion of the utility model is the prior art.
The embodiment selected herein for the goal of the invention of open the utility model, is presently considered to be suitable,
However, it should be understood that the utility model be intended to include all embodiments belonged in this design and invention scope all changes
Change and improves.
Claims (5)
1. a kind of K idol temperature-measuring modules for diesel engine monitoring system, including shell（1）, 10 road k type thermocouples sensings
Device input interface A（2）, debugging mouth（3）, power inlet（4）, 10 road k type thermocouple sensor inputs B（5）、
RS485 communication interfaces（6）, first via CAN communication interface（7）, the second tunnel CAN communication interface（8）And printed circuit board, feature
It is：In the shell（1）Cavity in be equipped with printed circuit board, be respectively equipped on the printed circuit board input processing electricity
Road, MCU circuits, toggle switch, RS485 driving circuits, first via CAN driving circuits and the second road CAN driving circuits, it is described defeated
Enter processing circuit include 20 road K indexing thermocouple signal filter circuit, No. 16 analog multiplexers, six amplifying circuits,
Cold junction temperature sensor and its driving circuit, No. 16 analog multiplexer select ADG506AKR, the amplifying circuit
Amplifier selects AD8608, the input terminal of the 20 road K indexing thermocouple signal filter circuit to be separately connected 20 K indexing thermocouples,
In 16 road K indexing thermocouple signal filter circuit output ends connect the input terminals of No. 16 analog multiplexers, 16 tunnel simulation
The output end of multiplexer connects the input terminal of amplifying circuit all the way, and other four 4 road K index thermocouple signal filter circuit
Output end is separately connected the input terminal of four amplifying circuits, the output end connection cold junction temperature sensing of the cold junction temperature sensor
The input terminal of device driving circuit, the output end of the cold junction temperature sensor drive driving circuit connect the input of an amplifying circuit
End, the output ends of six amplifying circuits are separately connected MCU, the input terminals of the MCU circuits be separately connected toggle switch and
The output end of input processing circuit, the output ends of MCU circuits be separately connected RS485 driving circuits, first via CAN driving circuits and
The input terminal of second road CAN driving circuits, input processing circuit, MCU circuits, RS485 driving circuits, first via CAN driving electricity
Road and the second road CAN driving circuits are separately connected power circuit, in shell（1）Front panel on be respectively equipped with 10 road k indexing heat
Thermocouple sensor input interface A（2）, debugging mouth（3）, power inlet（4）, 10 road k type thermocouple sensor inputs B
（5）, RS485 communication interfaces（6）, first via CAN communication interface（7）With the second tunnel CAN communication interface（8）, the RS485 communications
Interface（6）, first via CAN communication interface（7）With the second tunnel CAN communication interface（8）It is separately connected RS485, first via CAN and
The communication bus of two road CAN, power inlet（4）Connect power supply, debugging mouth（3）Connect commissioning device, 10 road k indexing heat
Thermocouple sensor input interface A（2）With 10 road k type thermocouple sensor inputs B（5）It is separately connected 20 road K indexing heat
Even sensor forms the K idol temperature-measuring modules for diesel engine monitoring system.
2. the K idol temperature-measuring modules according to claim 1 for diesel engine monitoring system, it is characterized in that：The electricity
Source circuit is isolated DC power supply conversion regime, and permission power supply voltage range is 9~36V.
3. the K idol temperature-measuring modules according to claim 1 for diesel engine monitoring system, it is characterized in that：The K points
Ranging from 0~800 DEG C of the measuring temperature of thermocouple is spent, measurement accuracy is ± 1%.
4. the K idol temperature-measuring modules according to claim 1 for diesel engine monitoring system, it is characterized in that：The MCU
Select 16 bit processor 9S12XET256 of Freescale.
5. the K idol temperature-measuring modules according to claim 1 for diesel engine monitoring system, it is characterized in that：The print
Circuit board processed is bolted on shell（1）It is interior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721478143.9U CN207923309U (en) | 2017-11-08 | 2017-11-08 | A kind of K idol temperature-measuring modules for diesel engine monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721478143.9U CN207923309U (en) | 2017-11-08 | 2017-11-08 | A kind of K idol temperature-measuring modules for diesel engine monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN207923309U true CN207923309U (en) | 2018-09-28 |
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ID=63613063
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|---|---|---|---|
| CN201721478143.9U Expired - Fee Related CN207923309U (en) | 2017-11-08 | 2017-11-08 | A kind of K idol temperature-measuring modules for diesel engine monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588862A (en) * | 2017-11-08 | 2018-01-16 | 河南柴油机重工有限责任公司 | A kind of K idol temperature-measuring modules for diesel engine monitoring system |
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2017
- 2017-11-08 CN CN201721478143.9U patent/CN207923309U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588862A (en) * | 2017-11-08 | 2018-01-16 | 河南柴油机重工有限责任公司 | A kind of K idol temperature-measuring modules for diesel engine monitoring system |
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