CN113324668A - Wireless temperature measurement controller for high-frequency acquisition of transient temperature on surface of piston of internal combustion engine - Google Patents
Wireless temperature measurement controller for high-frequency acquisition of transient temperature on surface of piston of internal combustion engine Download PDFInfo
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- CN113324668A CN113324668A CN202110495328.5A CN202110495328A CN113324668A CN 113324668 A CN113324668 A CN 113324668A CN 202110495328 A CN202110495328 A CN 202110495328A CN 113324668 A CN113324668 A CN 113324668A
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Abstract
The invention discloses a wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of a piston of an internal combustion engine, which belongs to the technical field of engines, electronic circuits and communication and comprises an information acquisition and conversion module, an internal temperature compensation module, a Wi-Fi module and a power module, wherein the output end of the power module is electrically connected with the input ends of the information acquisition and conversion module, the internal temperature compensation module and the Wi-Fi module respectively, the output end of the Wi-Fi module is connected with the input end of a router through a network, and the output end of the router is connected with the input end of a computer through a network; the structure is small and light, is convenient to install in a narrow and complex environment in an engine cylinder, can normally work in a high-temperature environment range, has extremely small measurement error, can realize the effect of continuous work for multiple days after one-time charging, can realize eight-channel 10kHz synchronous sampling, and meets the high-speed sampling requirement of acquiring temperature signals according to the angle of a crankshaft in an engine.
Description
Technical Field
The invention belongs to the technical field of engines, electronic circuits and communication, and particularly relates to a wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of a piston of an internal combustion engine.
Background
The internal combustion engine, which is the most thermally efficient power plant, is at a position difficult to replace in the transportation field, and plays a significant role particularly in freight transportation, passenger transportation, and ship transportation. In an internal combustion engine, a piston is a heart component and plays key roles of heat-power conversion, flow field organization, combustion organization and the like. However, the working conditions of the piston are very harsh, the piston is in direct contact with high-temperature gas (2500K), the piston is subjected to the coupling action of alternating thermal stress and alternating mechanical stress, the reliability problem of the piston is very severe and important, and the accurate measurement of the temperature field of the piston is a premise and a basis for evaluating and researching the thermal load and the reliability problem of the piston. Meanwhile, the piston is used as a solid boundary in the flowing, burning and heat transfer processes in the cylinder, and the temperature data of the piston is also indispensable basic data for researching the burning and heat transfer problems in the cylinder of the internal combustion engine. But its measurement degree of difficulty is very big, because the piston is making reciprocating motion all the time, and is in airtight, electromagnetic interference, high temperature, highly compressed adverse circumstances, and temperature measuring equipment can't work under this environment very often.
Disclosure of Invention
The invention aims to: in order to solve the problems, the wireless temperature measurement controller for high-frequency acquisition of the transient temperature of the surface of the piston of the internal combustion engine is provided.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a wireless temperature measurement controller of internal-combustion engine piston surface transient state temperature high frequency collection, includes information acquisition and conversion module, inside temperature compensation module, Wi-Fi module and power module, power module's output respectively with information acquisition and conversion module, inside temperature compensation module and Wi-Fi module's input electric connection, Wi-Fi module's output passes through network connection with the input of router, network connection is passed through with the input of computer to the output of router.
As a further description of the above technical solution: the structure is small and light, convenient to install in a narrow and small complex environment in an engine cylinder, the packaging size is 50mm multiplied by 30mm multiplied by 15mm, the weight is less than 5g, the structure can be suitable for being installed in engines of different types quickly, and the whole application range of the structure is improved.
The information acquisition and conversion module comprises an acquisition channel, a low-pass filter and an analog-to-digital conversion chip, wherein the output end of the acquisition channel is electrically connected with the input end of the low-pass filter, and the output end of the low-pass filter is electrically connected with the input end of the analog-to-digital conversion chip.
As a further description of the above technical solution: the analog-to-digital conversion chip supports 8-channel 24-bit synchronous sampling, the chip ADS131M08 converts an analog signal into an equivalent digital signal by adopting a sigma-delta conversion technology, and the ADS131M08 chip supports a low power consumption mode and is connected with the Wi-Fi module in an SPI bus mode.
The collecting channel is used for sensing temperature change of the surface of the piston, the low-pass filter adopts a first-order low-pass RC differential filter, the analog-to-digital conversion chip is ADS131M08, and the internal temperature compensation module adopts an internal temperature compensation chip LM 95071.
As a further description of the above technical solution: the temperature information is sensed by an acquisition channel, converted into a voltage signal and input into a chip ADS131M08, and the voltage signal is amplified inside the ADS131M08 chip and converted into a digital signal in an analog-digital manner; and finally, sending the obtained digital signal to the Wi-Fi module.
The Wi-Fi module comprises a Wi-Fi chip and an antenna, wherein the output end of the Wi-Fi chip is electrically connected with the input end of the antenna, and the Wi-Fi chip is an ESP8285 chip.
As a further description of the above technical solution: the service life of the equipment is long, the reliability is high, and manual correction is not needed; the internal temperature compensation chip is connected with the Wi-Fi chip ESP8285 in an SPI bus mode, collected temperature signals are converted into digital signals and then transmitted to the Wi-Fi module, and the device can be rapidly switched between a sleep mode and a working mode to meet the requirement of low power consumption; the ESP8285 chip is also used as a main control chip for controlling the receiving and sending of signals; the Wi-Fi module exchanges data with the information acquisition and conversion module and the internal temperature compensation module through an SPI (serial peripheral interface) communication protocol; the antenna uses a miniature patch antenna, the signal input end uses a pi-type matching network to perform impedance matching on the antenna and ensure a complete ground plane, so that the antenna is stabilized at a 2.4G frequency band; the signal is finally sent to the router through the Wi-Fi module.
The power module comprises a battery and a voltage stabilizing chip, wherein the output end of the battery is electrically connected with the input end of the voltage stabilizing chip, and the voltage stabilizing chip adopts a low-dropout linear voltage stabilizing chip ADP7118 ACPZN-3.3-R7.
As a further description of the above technical solution: the battery provides 3.3V stable power supply through the voltage stabilizing chip, the power consumption of the structural peak value is less than 200mW, and energy is saved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the structure is small and light, the installation in a narrow and complex environment in an engine cylinder is convenient, the packaging size is 50mm multiplied by 30mm multiplied by 15mm, and the weight is less than 5g, so that the structure can be suitable for being quickly installed in different types of engines, and the whole application range of the structure is improved.
2. According to the invention, the structure can normally work within the temperature range of-40-125 ℃ and also can work in a high-temperature environment, the measurement error is less than 2%, and the structure can effectively bear extreme working environment temperature, so that the structure has a good application effect, the working effect is maintained, and working faults are not easy to occur.
3. According to the invention, the peak power consumption of the structure is less than 200mW, the standby power consumption is less than 200uW, and the effect of continuous working for multiple days after one-time charging can be realized, so that the structure has extremely high working efficiency, is energy-saving, and effectively improves the using effect of the structure.
4. According to the invention, the structure can realize 8-channel 10kHz synchronous sampling, and meets the high-speed sampling requirement of collecting temperature signals according to the angle of a crankshaft in an engine, so that the structure has a surface transient temperature high-frequency collecting effect, and is powerful in function and better in applicability.
Drawings
FIG. 1 is a block diagram of a wireless temperature measurement controller according to the present invention.
FIG. 2 is a schematic diagram of a first-order low-pass RC differential filter circuit according to the present invention.
FIG. 3 is a diagram of an analog-to-digital conversion chip and its peripheral circuits according to the present invention.
FIG. 4 is a circuit diagram of an internal temperature compensation module according to the present invention.
FIG. 5 is a diagram of a Wi-Fi chip and its peripheral circuits according to the present invention.
Fig. 6 is a diagram of an antenna and its peripheral circuits according to the present invention.
FIG. 7 is a diagram of a power module and its peripheral circuits according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-7, the present invention provides a technical solution: a wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of an internal combustion engine piston comprises an information acquisition and conversion module, an internal temperature compensation module, a power supply module and a Wi-Fi module, wherein the information acquisition and conversion module comprises an acquisition channel, a low-pass filter and an analog-to-digital conversion chip, the acquisition channel is used for sensing temperature change on the surface of the internal combustion engine piston, converting the temperature change into a voltage signal, filtering high-frequency noise by the low-pass filter, transmitting the high-frequency noise to the analog-to-digital conversion chip to be converted into a digital signal and transmitting the digital signal to the Wi-Fi module, the internal temperature compensation module has a cold end temperature compensation function, directly converting an internal temperature signal into an equivalent digital signal by adopting a high-precision temperature measurement chip and transmitting the equivalent digital signal to the Wi-Fi module, the power supply module provides stable power supply guarantee for the whole controller, and the Wi-Fi module comprises a Wi-Fi chip and an antenna, and the Wi-Fi module exchanges data with the information acquisition and conversion module and the internal temperature compensation module through an SPI (serial peripheral interface) communication protocol and sends the data to a router through an antenna.
The information acquisition and conversion module comprises an acquisition channel, a low-pass filter and an analog-to-digital conversion chip, wherein the acquisition channel is used for sensing the temperature change of the surface of the piston and converting the temperature change into a voltage signal; the low-pass filter adopts a first-order low-pass RC differential filter and is used for filtering high-frequency noise in the voltage signal output by the acquisition channel, and the low-pass filter has the characteristics of simple structure, low cost, small occupied size and the like and does not need extra power supply as a passive filter; the analog-to-digital conversion chip ADS131M08 supports 8-channel 24-bit synchronous sampling, the ADS131M08 chip converts an analog input signal into an equivalent digital signal by adopting a sigma-delta conversion technology, and the ADS131M08 chip supports a low power consumption mode, can be turned off in non-working time, reduces system power consumption, and prolongs the working time of one-time charging; voltage signals generated by the acquisition channel are input to the chip ADS131M08 after passing through the filter circuit, are amplified inside the chip ADS131M08, complete the processes of analog-digital conversion, digital filtering and the like, and finally, the digital signals are transmitted to the Wi-Fi module through an SPI communication protocol.
Considering aliasing effect, the time resolution of the ADS131M08 chip sampling is 244ns (4098kHz), the design goal of the low-pass filter is to attenuate noise of 4098kHz by 60dB, considering that a first-order low-pass RC filter attenuates by 20dB every 10 octaves, if the attenuation is 60dB, 1000 octaves are required, namely, the cut-off frequency is about 4000Hz, the circuit diagram of the first-order low-pass RC differential filter is shown in fig. 2, the first-order low-pass RC differential filter belongs to the knowledge well known to those skilled in the art, and the design principle is not described herein; as a preferred embodiment of the invention, R1 and R2 in FIG. 2 are 1K Ω, C4 is 1uF, and C2 and C6 are 100 nF.
The analog-to-digital conversion chip and the peripheral circuit thereof are shown in fig. 3, the whole chip is powered by two paths of digital and analog power supplies, such as a chip pin 15 shown in fig. 3: AVDD is analog power input and is connected with a power network A3V 3; the pin 26 is a digital power input, and is connected to the power network 3V3, in order to reduce the circuit power coupling as much as possible, the power pins 15 and 26 of the analog-to-digital conversion chip ADS131M08 are connected to decoupling capacitors of a certain size, that is, 1uF is taken for C32 and C42 shown in fig. 3, and for the pin 24: CAP, external to a capacitor to ground to ensure the stable LDO conversion voltage inside the chip, the capacitor C39 in fig. 3, taken as 220nF, needs to provide a stable conversion reference voltage for the sigma-delta ADC component inside the chip (sum-gain ADC), where an internal 1.2V reference is used to connect pin 14: REFIN connects a 100nF capacitor to AGND in series, the capacitor is shown as C47 in FIG. 3, ADS131M08 transmits information with ESP8285 by SPI protocol, and the pins used include 17: CS, connected to network SPI _ CS1, for SPI bus chip selection pin; 19: SCLK, connected to network SPI _ CLK, is SPI bus clock line; 20: DOUT, network SPI _ MISO; 21: DIN, network SPI _ MOSI, where chip pins 20, 21 are two information transmission lines of the SPI bus, chip pin 18: DRDY is a data conversion end indication pin, and chip ESP8285 pin 14: and the GPIO2 is connected to transmit a data conversion completion signal to the ESP 8285.
In order to ensure that the sampling frequency of the ADS131M08 chip is constant and the internal clock is stable, so that the chip operates in a stable frequency range, an active crystal oscillator of 8.192MHz is selected, and a clock signal is input to a pin 23 of the M08 of the ADS131M 08: CLKIN.
The internal temperature compensation module adopts an LM95071 chip, and has the characteristics of low measurement error of +/-1 ℃, small packaging size of 2.9mm multiplied by 1.6mm, long service life, high reliability, no need of manual correction and the like; the collected temperature signals can be internally converted into digital signals and transmitted to the Wi-Fi module through the SPI communication protocol.
The internal temperature compensation chip and the peripheral circuit thereof are shown in fig. 4, and a chip LM95071 is connected with a chip via a pin 5: VDD accesses a 3.3V power supply and is serially connected with a 100nF decoupling capacitor to GND, is connected with a chip ESP8285 through an SPI bus, and sends data to a Wi-Fi module, wherein the data comprises 3 pins 1: CS, connected to network SPI _ CS2, is SPI bus chip select line; 3: SI/O, connect network SPI _ MISO, it is a SPI bus information transmission line; 4: SC: and the network is connected with SPI _ CLK and is an SPI bus clock line.
The Wi-Fi module comprises a Wi-Fi chip and an antenna, the Wi-Fi chip adopts an ESP8285 chip, the inside of the ESP8285 chip is highly integrated and packaged into a size of 5mm multiplied by 5mm, and the Wi-Fi module can be rapidly switched between a sleep mode and a working mode to meet the requirement of low power consumption; the ESP8285 is used as a main control chip to control the work and the sleep of a system, and a program is burnt into the chip through a UART interface of the chip; the Wi-Fi module is connected with the information acquisition and conversion module and the internal temperature compensation module through an SPI bus; the antenna uses a miniature patch antenna, and the signal input end uses a pi-type matching network to perform impedance matching on the antenna, so that the antenna is stabilized at a 2.4G frequency band; the signal is finally sent to the router through the Wi-Fi module.
The Wi-Fi chip ESP8285 is a main control chip of the whole circuit module and is also a master device of an SPI protocol, the Wi-Fi chip and peripheral circuits thereof are shown in fig. 5, the ESP8285 is connected with the ADS131M08 and the LM95071 through SPI buses, and related ESP8285 chip pins include 21: SD _ CLK, the connecting network is SPI _ CLK; 22: SD _ DATA _0, connecting network SPI _ MISO; 23: SD _ DATA _1 connected to the network SPI _ MOSI; 15: GPIO0 connected to network SPI _ CS 1; 26: u0TXD, connecting network SPI _ CS 1.
For the Wi-Fi chip, the quality of the antenna directly influences the sending and receiving of signals. The antenna uses a miniature patch antenna, and takes the internal output impedance of a chip into consideration, a pi-type matching network is used for impedance matching to suppress signal reflection, the impedance of the PA output end of the ESP8285 is 39+ j6 omega, so the optimal rear-end antenna matching impedance is 39-j6 omega, and the antenna and the external circuit thereof are shown in FIG. 6.
The program burning interface is shown in fig. 5, and includes a pin 25: u0RXD, pin 26: u0TXD connects the two pins to a row of pins, J3 in FIG. 5.
The chip ESP8285 is connected to a 3.3V power supply and requires multiple 3.3V inputs, as shown in fig. 5, and related pins include 1: VDDA; 3: VDD3P 3; 4: VDD3P 3; 11: VDDPST; 17: VDDPST; 29: VDDD; 30: VDDA. The pins 3 and 4 supply power to the internal low noise amplifier, and the requirement on the power supply is higher, so an LC filter circuit is required to be added near a power supply pin for inhibiting high-frequency harmonic waves, as a preferred embodiment of the invention, the size of the inductor L2 is 4.3nH, the size of the capacitor C36 is 100nF, and the size of the capacitor C37 is 10 uF.
The power module contains battery and LDO chip, the LDO chip adopts the linear steady voltage chip ADP7118 of low dropout, the battery passes through steady voltage chip can provide 3.3V's stable power supply, keeps apart via 0 omega resistance, can further be divided into 3.3V digital power supply and 3.3V analog power supply. The WIFI chip ESP8285 and the internal temperature compensation chip LM95071 both adopt 3.3V analog power supplies; the ADS131M08 analog-to-digital conversion chip is powered by two paths of power supplies, namely a 3.3V digital power supply and a 3.3V analog power supply.
The power supply module and its peripheral circuits are shown in fig. 7. The whole controller is powered by a battery, the LDO chip ADP7118 is used as a voltage stabilizing device, the voltage of the battery with the voltage of about 5V is stabilized at 3.3V, stable power supply is provided for the whole controller, and the normal work of the whole controller is ensured. Battery power is supplied from pin 6 of chip ADP 7118: VIN input, the resulting 3.3V voltage is driven from pin 1: outputting VOUT; enable pin 4: EN directly with pin 6: VIN phase connection is realized, and the self-starting of the chip is realized. Soft start pin 5: SS is connected with a 1nF capacitor, namely C18 in FIG. 7, and the soft start time is controlled within 1 ms. In the pin 1: VOUT, 6: the VIN terminals are respectively connected in series with 2.2uF capacitors, namely C14 and C15 shown in FIG. 7.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The utility model provides a wireless temperature measurement controller that internal-combustion engine piston surface transient state temperature high frequency gathered, includes information acquisition and conversion module, inside temperature compensation module, Wi-Fi module and power module, its characterized in that: the output end of the power supply module is electrically connected with the input ends of the information acquisition and conversion module, the internal temperature compensation module and the Wi-Fi module respectively, the output end of the Wi-Fi module is connected with the input end of the router through a network, and the output end of the router is connected with the input end of the computer through a network.
2. The wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of a piston of an internal combustion engine according to claim 1, wherein the information acquisition and conversion module comprises an acquisition channel, a low-pass filter and an analog-to-digital conversion chip, an output end of the acquisition channel is electrically connected with an input end of the low-pass filter, and an output end of the low-pass filter is electrically connected with an input end of the analog-to-digital conversion chip.
3. The wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of the piston of the internal combustion engine according to claim 2, wherein the acquisition channel is used for sensing temperature change on the surface of the piston, and the low-pass filter adopts a first-order low-pass RC differential filter.
4. The wireless temperature measurement controller for high-frequency acquisition of transient temperature of the surface of the piston of the internal combustion engine according to claim 3, wherein the analog-to-digital conversion chip is ADS131M 08.
5. The wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of the piston of the internal combustion engine as claimed in claim 4, wherein the internal temperature compensation module adopts an internal temperature compensation chip LM 95071.
6. The internal combustion engine piston surface transient temperature high-frequency acquisition wireless temperature measurement controller according to claim 5, wherein the Wi-Fi module comprises a Wi-Fi chip and an antenna, an output end of the Wi-Fi chip is electrically connected with an input end of the antenna, and the Wi-Fi chip is an ESP8285 chip.
7. The wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of a piston of an internal combustion engine according to claim 6, wherein the power module comprises a battery and a voltage stabilizing chip, and an output end of the battery is electrically connected with an input end of the voltage stabilizing chip.
8. The wireless temperature measurement controller for high-frequency acquisition of transient temperature on the surface of the piston of the internal combustion engine as claimed in claim 7, wherein the voltage stabilizing chip adopts a low-pressure-difference linear voltage stabilizing chip ADP7118 ACPZN-3.3-R7.
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| CN202110495328.5A CN113324668A (en) | 2021-05-07 | 2021-05-07 | Wireless temperature measurement controller for high-frequency acquisition of transient temperature on surface of piston of internal combustion engine |
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| CN202110495328.5A CN113324668A (en) | 2021-05-07 | 2021-05-07 | Wireless temperature measurement controller for high-frequency acquisition of transient temperature on surface of piston of internal combustion engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| US5106202A (en) * | 1990-12-18 | 1992-04-21 | Board Of Control Of Michigan Technological University | Apparatus for measuring the temperature of a piston in an internal combustion engine |
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| 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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