CN109612736A - A kind of telemetry system and its measurement method of internal combustion engine top wall surface transient temperature - Google Patents
A kind of telemetry system and its measurement method of internal combustion engine top wall surface transient temperature Download PDFInfo
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- CN109612736A CN109612736A CN201811458864.2A CN201811458864A CN109612736A CN 109612736 A CN109612736 A CN 109612736A CN 201811458864 A CN201811458864 A CN 201811458864A CN 109612736 A CN109612736 A CN 109612736A
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- temperature
- thermocouple
- wall surface
- top wall
- processing unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/048—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/028—Means for indicating or recording specially adapted for thermometers arrangements for numerical indication
-
- 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
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/021—Particular circuit arrangements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention belongs to the technical fields of internal combustion engine measurement, and disclose the telemetry system and its measurement method of a kind of internal combustion engine top wall surface transient temperature.System includes surface thermocouple, signal processing unit and host computer, and thermocouple setting top surface is concordant with the top wall surface of piston, for measuring the temperature of piston top wall surface, and is converted into analog voltage signal and passes to signal processing unit；Signal processing unit is connected with surface thermocouple, for passing to host computer after converting temperature for the analog voltage signal from thermocouple received, host computer is used to set the initiation parameter of system, and it controls signal processing unit beginning and end and receives the analog voltage signal from thermocouple, while the temperature for the thermocouple phase fed back from signal processing unit being shown.Through the invention, the problems such as conducting wire for solving to draw from the piston to run at high speed is easy fatigue break, and temp measuring system service life is low, versatile, high reliablity is applied widely.
Description
Technical field
The invention belongs to the technical fields of internal combustion engine measurement, more particularly, to a kind of internal combustion engine top wall surface transient state
The telemetry system and its measurement method of temperature.
Background technique
Piston is the important component of internal combustion engine, subjects the dual work of severe alternation mechanical stress and alternating thermal stress
With, it is the component that operating condition is most harsh in reciprocating internal combustion engine, piston top surface cracking and ablation phenomen frequent occurrence, therefore,
Accurately measurement piston top wall surface temperature seems extremely important.So far, the precise measurement of piston top wall surface temperature is still one
A problem, while being also a hot issue.The method of measurement piston top wall surface temperature can be divided into non-electrical measuring method and electrical measuring method.
Non- electrical measuring method mainly has hardness plug method, fusible alloy method and visualization phosphorus method, and wherein hardness plug method can only be surveyed roughly
Measure the temperature maximum in entire measurement process；Fusible alloy method can only determine the temperature range of temperature measurement location point, and error is big, survey
Measure heavy workload；Visualizing phosphorus method can the progress surface temperature survey of stimulated emission visible light under certain wavelength light action using phosphorus
Amount, the effective time of this method thermometric is very short, in addition, visualization phosphorus method temperature measuring equipment is expensive, process trouble, installation
Required precision is high；Electrical measuring method uses thermal resistance or thermocouple measurement, and difficult point is that the dynamic response of sensor and data transmit.Number
There are direct lead wire formula mensuration, electromagnetic induction method, storage method of testing, infrared remote sensing method of testing and wireless transmission method according to transmission mode
Deng.Nowadays be electrical measuring method using most piston top wall surface temperature measurement methods, electrical measuring method can be divided into again wired measuring method with
Radio measurements.Wherein wired measuring method is the thermoelectricity occasionally thermal resistance sensor installed on piston, utilizes work by ingenious
Plug, connecting rod position relationship, and designing subsidiary body enables transfer wire to arrange.But with piston, link mechanism it is reciprocal
Movement, conducting wire are easy to abrasion or fatigue break, reduce the reliability of system.For radio measurements, mainly have following several
Kind mode: electromagnetic induction method wireless temperature measuring device, the device are that primary is coupled with secondary coil when reaching lower dead center using piston
The electromagnetic induction phenomenon of generation measures piston face temperature change, this method measurement accuracy is low, needs to install excitation wire on piston
Circle, so that the quantity of measuring point is very restricted, and can only measure the temperature near lower dead center.Infrared remote sensing temp measuring system
Since switching emission data need the regular hour, the real-time of temperature measurement cannot be guaranteed.STORAGE MEASUREMENT TECHNIQUE includes
Data acquisition, memory module and data interpret module two large divisions, and in Data acquisition and storage module, single-chip microcontroller will be collected into
Data be packaged as a customized data packet, be stored in dedicated memory, data taken out after shutting down.Memory-type is surveyed
Warm device is unable to real-time collecting to temperature data, and is limited by memory storage space, and the temperature information of acquisition is limited, no
Conducive to the post-processing of data.
The described memory-type piston temperature measurement device using heat insulation box form of 102156005 B of patent CN；Patent
106017712 B of CN uses NAND Flash memory chip, improves the acquisition speed of piston transient temperature；A kind of last nothing
Line signal transmission form, a kind of piston temperature wireless measurement based on Bluetooth transmission as described in 106908164 A of patent CN
Device, but 106908164 A of patent CN needs the conducting wire on body, system includes receiving antenna, data reception module and
Harness, system structure is complicated, and Wi Fi communication has transmission speed fast relative to Bluetooth communication, and long transmission distance is able to achieve two-way
Communication can be controlled multi-channel signal processing unit by SCM program and realize that wake-up switches with dormant state；Patent CN
102749149 A are by ZigBee wireless technology sending and receiving data, but ZigBee, as a kind of emerging technology, transmission speed is not
Height, and due to reliability aspect, there are no large-scale promotions.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of internal combustion engine top wall surface transient states
The telemetry system and its measurement method of temperature, wherein the design to its key component signal processing unit, enables it to quick standard
The voltage signal of true acquisition thermocouple measuring temperature, while converting temperature for the voltage signal and being passed to by WiFi module
Host computer is communicated by WiFi module realization between the signal processing unit and host computer, on the one hand makes letter between the two
Number transmission is not limited by geographical location and distance, and on the other hand, transmission speed is fast, high reliablity, while also solving tradition
The problems such as conducting wire drawn from the piston to run at high speed is easy fatigue break, and temp measuring system service life is low realizes piston top
The real-time of wall surface temperature data transfer increases the reliability of measurement result, reduces measurement difficulty, low in energy consumption, dress
It sets small in size etc..
To achieve the above object, according to one aspect of the present invention, a kind of internal combustion engine top wall surface transient state temperature is provided
The telemetry system of degree, which is characterized in that the system comprises surface thermocouple, signal processing unit and host computers, wherein
The thermocouple is arranged on internal combustion engine to be measured, and top surface is concordant with the top wall surface of the piston, is used for
The temperature of the piston top wall surface is measured, and is that analog voltage signal passes to the signal processing unit by the temperature inversion；
The signal processing unit is connected with the surface thermocouple, the simulation from the thermocouple for that will receive
Voltage signal passes to the host computer, including sequentially connected filter circuit, operational amplification circuit, monolithic after being converted into temperature
Machine and WiFi module, the filter circuit are used to for the analog voltage signal to be filtered removal noise therein, the fortune
It calculates amplifying circuit to be used to filtered analog voltage signal being amplified and passed to the single-chip microcontroller, the institute which will receive
The analog voltage signal for stating amplification is converted into temperature and passes to the WiFi module, is passed on described by the WiFi module
Position machine；
The host computer is connect with the signal processing unit, for setting the initiation parameter of the system, and is controlled
The signal processing unit beginning and end receives the analog voltage signal from the thermocouple, while will come from the signal
The temperature of the thermocouple of processing unit feedback is shown.
It is further preferred that the surface of the thermocouple is coated with inorganic glue resistant to high temperature, for consolidating the thermocouple
It is scheduled on the piston.
It is further preferred that aluminium film is electroplated in the top wall surface of the top surface of the thermocouple and the piston, so as to form guarantor
The top wall surface of the top surface of the thermocouple and the piston is isolated with the combustion gas of the combustion chamber, is avoided direct contact with by sheath.
It is further preferred that the lower section of the piston is arranged in the signal processing unit, pass through quartz plate and the work
Plug connection, the quartz plate carry out hot transmitting to the signal processing unit for reducing the piston.
It is further preferred that the initiation parameter includes thermocouple number, thermocouple voltages signal intensity section, resolves
Temperature coefficient and sample frequency.
It is another aspect of this invention to provide that providing a kind of measurement method of telemetry system described above, feature exists
In this method includes the following steps:
(a) host computer issues the instruction for starting to acquire data, and the signal processing unit receives the signal of beginning
Into operating mode, this enter operating mode the following steps are included:
(a1) serial port protocol between the WiFi module and single-chip microcontroller is initialized, and realizes communication between the two；
(a2) WiFi module receives initiation parameter and the parsing of the host computer interface input, obtains this test
Thermocouple number, thermocouple voltages signal intensity section, resolve temperature coefficient and sample frequency；
(a3) in the analog-digital converter in the single-chip microcontroller parameter setting, that is, set the temperature and voltage of the thermocouple
The proportionality coefficient of signal conversion；
(b) signal processing unit acquires the analog voltage signal of the temperature of piston top wall surface described in the thermocouple measurement,
By the analog voltage signal through the filter circuit, operational amplification circuit is successively filtered and enhanced processing and passes to described
Single-chip microcontroller, the single-chip microcontroller are translated into digital voltage signal after receiving the analog voltage signal, then using described
Proportionality coefficient converts temperature for the digital voltage signal and passes to the WiFi module by serial ports；
(c) temperature is passed to the host computer by the WiFi module, while the host computer shows the temperature,
Thus measurement process is completed.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1, internal combustion engine top wall surface transient temperature telemetry system provided by the invention, solves from the piston to run at high speed
The problems such as conducting wire of upper extraction is easy fatigue break, and temp measuring system service life is low；And use the real-time of non-electrical measuring method not
By force, heavy workload, and the problems such as precision is low；
2, internal combustion engine top wall surface transient temperature telemetry system provided by the invention, it is less to piston change, to internal combustion
Machine cylinder body does not need to change, versatile, high reliablity, suitable for most of type internal combustion engine top wall surface transient temperatures
Measurement.
Detailed description of the invention
Fig. 1 is internal combustion engine top wall surface transient temperature telemetry system constructed by preferred embodiment according to the invention
Structural schematic diagram；
Fig. 2 is internal combustion engine top wall surface transient temperature telemetry system constructed by preferred embodiment according to the invention
Structure simplification figure；
Fig. 3 is internal combustion engine top wall surface transient temperature telemetry system constructed by preferred embodiment according to the invention
Work flow diagram.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
1- surface thermocouple 2- signal processing unit 3- host computer 4- combustion chamber 5- piston 6- thermocouple wire 7-
Quartz plate
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Fig. 1 is internal combustion engine top wall surface transient temperature telemetry system constructed by preferred embodiment according to the invention
Structural schematic diagram, as shown in Figure 1, a kind of telemetry system and its measurement method of internal combustion engine top wall surface transient temperature, including
Surface thermocouple 1, signal processing unit 2 and host computer 3, thermocouple are arranged in combustion chamber 4 on piston 5,5 top wall surface temperature of piston
The position to be measured of degree processes through-hole, and the diameter of through-hole is identical as the diameter of surface thermocouple 1, and signal processing unit 2 includes filtering
Circuit, operational amplification circuit, single-chip microcontroller and Wi Fi module.
The detecting head surface of surface thermocouple 1 coats one layer of C-2 refractory inorganic adhesive of saving the situation, and surface thermocouple 1 is fitted in work
In the through-hole of 5 processing of plug, 1 top surface of surface thermocouple and 5 either flush of piston, after C-2 high temperature resistant inorganic adhesive curing of saving the situation, table
The top surface of face thermocouple 1 and 5 top surface of piston are handled using parcel plating technology, prevent the hot junction of surface thermocouple 1 with
Combustion gas in combustion chamber 4 directly contacts；Thermocouple wire 6 is adhesive on the inner wall of plunger shaft with C-2 high temperature resistant inorganic of saving the situation；Heat
Galvanic couple can be to be multiple, while being connect with signal processing unit 2 by thermocouple wire 6, and relative to piston 5 be it is static, with
Piston motion and move.
The temperature signal perceived is converted to electric signal by surface thermocouple, and is transmitted electric signal by thermocouple wire
To signal processing unit, signal processing unit is by the electric signal received by passing through Wi after the processing such as filtering, operation amplifier
Fi module launches outward, and host computer receives signal by access Wi Fi module, and parses temperature signal, in host computer interface
Upper real-time display, host computer can realize that sleep pattern is cut with enabled state by Wi Fi module described in Wi Fi communication control
It changes, extends the experimental period of single group battery.
Signal processing unit 2 is potted in Metal Packaging box with C-2 refractory inorganic adhesive of saving the situation, and Metal Packaging box is not using
Rust steel is welded, and one layer of quartz plate 7 is added between Metal Packaging box and piston boss lower edge, reduces piston 5 to Metal Packaging box
Heat transfer, Metal Packaging box is fixed on piston boss lower edge.
Fig. 2 is internal combustion engine top wall surface transient temperature telemetry system constructed by preferred embodiment according to the invention
Structure simplification figure, as shown in Fig. 2, signal processing unit includes filter circuit, operational amplification circuit, single-chip microcontroller and Wi Fi module；
Operational amplification circuit is for amplifying the analog voltage signal received；The analog voltage that the included analog-digital converter of single-chip microcontroller will receive
Signal is converted into the identifiable digital voltage signal of single-chip microcontroller, and single-chip microcontroller will be in the digital voltage signal and analog-digital converter that receive
Temperature value measured by the thermocouple that the proportionality coefficient of setting obtains after being multiplied.
In the present embodiment, surface thermocouple uses NANMAC E12 corrosion type surface thermocouple；Single-chip microcontroller uses
STM32F103RCT7 single-chip microcontroller；Wi Fi module uses ESP8266 master chip；High-temperature plastic is using C-2 high temperature resistant inorganic of saving the situation
Glue.
Fig. 3 is internal combustion engine top wall surface transient temperature telemetry system constructed by preferred embodiment according to the invention
The measuring process of telemetry system of the invention is explained below in work flow diagram, under specifically entering:
(1) test measurement starts, by host computer send acquisition start instruction, control multi-channel signal processing unit into
Enter operating mode；
(2) serial port protocol between Wi Fi module and single-chip microcontroller is initialized, realizes communication between the two；
(3) initiation parameter and the parsing that host computer interface input is received by Wi Fi module, obtain the heat of this test
Galvanic couple number, resolves temperature coefficient and sample frequency at thermocouple voltages signal intensity section；
(4) ADC configuration initialization, to its, initial parameter is configured, and electric thermo-couple temperature-voltage relationship initialization obtains
Proportionality coefficient, the ratio system are the temperature by acquiring in surface thermocouple, are converted into voltage signal, pass through temperature and voltage
Between relationship obtain；
(5) signal processing unit receives the analog voltage signal converted after thermocouple measurement, by believing the analog voltage
Number, through filter circuit, operational amplification circuit is successively filtered and enhanced processing and passes to single-chip microcontroller, the modulus in single-chip microcontroller
The analog voltage signal received converts the identifiable digital voltage signal of single-chip microcontroller by converter ADC, and single-chip microcontroller will receive
Digital voltage signal obtains temperature value after being multiplied with proportionality coefficient, the temperature value is then sent to Wi Fi module；
(6) Wi Fi module launches outward, and host computer receives signal by access Wi Fi module, and parses temperature letter
Number, real-time display, test measurement terminate on the upper computer interface, send the instruction that acquisition terminates by host computer, control multi-pass
Road signal processing unit enters sleep battery saving mode.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of telemetry system of internal combustion engine top wall surface transient temperature, which is characterized in that the system comprises thermocouples
(1), signal processing unit (2) and host computer (3), wherein
The thermocouple (1) is arranged on internal combustion engine to be measured (5), and top surface is concordant with the top wall surface of the piston (5),
It is that analog voltage signal passes to the signal processing list for measuring the temperature of the piston top wall surface, and by the temperature inversion
Member；
The signal processing unit (2) is connected with the surface thermocouple (1), the mould from the thermocouple for that will receive
Quasi- voltage signal passes to the host computer, including sequentially connected filter circuit, operational amplification circuit, list after being converted into temperature
Piece machine and WiFi module, the filter circuit is used to for the analog voltage signal being filtered removal noise therein, described
Operational amplification circuit is used to filtered analog voltage signal being amplified and passed to the single-chip microcontroller, which will receive
The analog voltage signal of the amplification is converted into temperature and passes to the WiFi module, is passed to by the WiFi module described
Host computer；
The host computer (3) communicates with the signal processing unit (2), for setting the initiation parameter of the system, and controls
It makes the signal processing unit beginning and end and receives the analog voltage signal from the thermocouple, while the letter will be come from
The temperature that the thermocouple of number processing unit feedback measures is shown.
2. a kind of telemetry system of internal combustion engine top wall surface transient temperature as described in claim 1, which is characterized in that described
The surface of thermocouple (1) is coated with inorganic glue resistant to high temperature, for the thermocouple to be fixed on the piston.
3. a kind of telemetry system of internal combustion engine top wall surface transient temperature as claimed in claim 1 or 2, which is characterized in that
Aluminium film is electroplated in the top surface of the thermocouple (1) and the top wall surface of the piston (5), so as to form protective layer, by the thermoelectricity
The top wall surface of even top surface and the piston is isolated with the combustion gas of the combustion chamber, is avoided direct contact with.
4. a kind of telemetry system of internal combustion engine top wall surface transient temperature as described in any one of claims 1-3, feature
It is, the lower section of the piston is arranged in the signal processing unit (2), is connect by quartz plate with the piston, the stone
English piece carries out hot transmitting to the signal processing unit for reducing the piston.
5. a kind of telemetry system of internal combustion engine top wall surface transient temperature according to any one of claims 1-4, feature
It is, the initiation parameter includes thermocouple number, thermocouple voltages signal intensity section, resolves temperature coefficient and sampling frequency
Rate.
6. a kind of measurement method of telemetry system as described in any one in claim 1-5, which is characterized in that under this method includes
Column step:
(a) host computer issues the instruction for starting to acquire data, and the signal that the signal processing unit receives beginning enters
Operating mode, this enter operating mode the following steps are included:
(a1) serial port protocol between the WiFi module and single-chip microcontroller is initialized, and realizes communication between the two；
(a2) WiFi module receives initiation parameter and the parsing of the host computer interface input, obtains the heat of this test
Galvanic couple number, resolves temperature coefficient and sample frequency at thermocouple voltages signal intensity section；
(a3) in the analog-digital converter in the single-chip microcontroller parameter setting, that is, set the temperature and voltage signal of the thermocouple
The proportionality coefficient of conversion；
(b) signal processing unit acquires the analog voltage signal of the temperature of piston top wall surface described in the thermocouple measurement, by this
Through the filter circuit, operational amplification circuit is successively filtered and enhanced processing and passes to the monolithic analog voltage signal
Machine, the single-chip microcontroller are translated into digital voltage signal after receiving the analog voltage signal, then utilize the ratio
Coefficient converts temperature for the digital voltage signal and passes to the WiFi module by serial ports；
(c) temperature is passed to the host computer by the WiFi module, while the host computer shows the temperature, thus
Complete measurement process.
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| CN201811458864.2A CN109612736A (en) | 2018-11-30 | 2018-11-30 | A kind of telemetry system and its measurement method of internal combustion engine top wall surface transient temperature |
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Cited By (7)
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| CN110231100A (en) * | 2019-06-29 | 2019-09-13 | 潍柴动力股份有限公司 | A kind of thermometric piston and its installation of TC method |
| CN110350667A (en) * | 2019-06-24 | 2019-10-18 | 华中科技大学 | A kind of internal combustion engine remote temperature sensing system and method based on wireless charging |
| CN110868104A (en) * | 2019-11-21 | 2020-03-06 | 武汉理工大学 | Passive device for driving engine piston wireless sensing module |
| CN113027608A (en) * | 2021-04-06 | 2021-06-25 | 华中科技大学 | Internal combustion engine piston top surface transient temperature remote measuring system and installation method thereof |
| CN113203499A (en) * | 2021-04-02 | 2021-08-03 | 华中科技大学 | Transient temperature measurement calibration method and system |
| CN113281052A (en) * | 2021-05-07 | 2021-08-20 | 华中科技大学 | Wireless temperature measurement emission controller for low-frequency acquisition of surface temperature of piston of internal combustion engine |
| CN114173217A (en) * | 2021-11-09 | 2022-03-11 | 天津大学 | Wireless data transmission device and method for measurement information in piston of internal combustion engine cylinder |
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| CN113027608A (en) * | 2021-04-06 | 2021-06-25 | 华中科技大学 | Internal combustion engine piston top surface transient temperature remote measuring system and installation method thereof |
| CN113281052A (en) * | 2021-05-07 | 2021-08-20 | 华中科技大学 | Wireless temperature measurement emission controller for low-frequency acquisition of surface temperature of piston of internal combustion engine |
| CN113281052B (en) * | 2021-05-07 | 2022-01-28 | 华中科技大学 | Wireless temperature measurement emission controller for low-frequency acquisition of surface temperature of piston of internal combustion engine |
| CN114173217A (en) * | 2021-11-09 | 2022-03-11 | 天津大学 | Wireless data transmission device and method for measurement information in piston of internal combustion engine cylinder |
| CN114173217B (en) * | 2021-11-09 | 2022-11-04 | 天津大学 | Wireless data transmission device and method for measurement information in piston of internal combustion engine cylinder |
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Application publication date: 20190412 |
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| RJ01 | Rejection of invention patent application after publication |