CN101029840A - Gas flow sensor with integrated control and its integrated controlling method - Google Patents
Gas flow sensor with integrated control and its integrated controlling method Download PDFInfo
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- CN101029840A CN101029840A CN 200610049674 CN200610049674A CN101029840A CN 101029840 A CN101029840 A CN 101029840A CN 200610049674 CN200610049674 CN 200610049674 CN 200610049674 A CN200610049674 A CN 200610049674A CN 101029840 A CN101029840 A CN 101029840A
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Abstract
A method for integrated-controlling gas flow rate includes separately utilizing flow rate sensing head, temperature sensing head and humidity sensing head to detect out gas flow rate value, temperature value and humidity value of flow rate transducer under operation state of said transducer; inputting said values into monolithic computer and generating relevant voltage value after said values are processed by said computer. The transducer used fro realizing said method is also disclosed.
Description
Technical field
The present invention relates to the gasmetry field, especially relate to a kind of gas flow sensor and integrated control method thereof of integrated control.
Background technology
Air flow sensor is the vitals in the car engine electronic fuel injection system, and its performance quality is the key factor that influences engine performance such as engine power performance, oil consumption, exhaust emissions.The electronically controlled gasoline injection engine must correctly be measured the air capacity that each moment sucks engine in order to obtain the combination gas of optium concentration under various running operating modes, calculates the main foundation of (control) distributive value as ECU with this.The central controller of electric injection system (ECU) sprays according to the corresponding oil mass of signal controlling that air flow sensor is sent, to guarantee " air-fuel ratio " under the various operating modes.If air flow sensor or circuit break down, ECU can not get correct air inflow signal, just can not normally carry out the control of distributive value, will cause combination gas overrich or rare excessively, makes engine running undesired.
Air flow sensor is transformed into voltage signal with air mass flow, and (flow velocity) heat of taking away caused the principle of temperature variation when general air flow sensor principle all adopted application of air to flow.But same air mass flow, in air themperature, humidity not simultaneously, the heat of being taken away is also different.Therefore, general gas flow sensor can not correctly reflect motor car engine in different regions, actual gas flow under the Various Seasonal environmental baseline, thus influenced the control accuracy of the electronic fuel injection system, reduced the performance of engine.
For this reason, people have carried out long-term exploration, have proposed diversified embodiment.For example, Chinese patent literature discloses a kind of flow sensor and temperature sensor (application number: CN200510051725.4), flow sensor, by preventing of the harmful effect of ambient temperature condition to measuring accuracy, improve measuring accuracy, even make higher viscous fluid or the tiny flow quantity of viscosity, also can correctly be determined at the flow of the fluid that flows in the pipe arrangement, and be easy to assembling; This flow sensor has flow testing division, fin, reaches lead-out terminal, this flow testing division forms by clipping insulator stratum Hair Fixer hot body and temperature sensor, this fin engages an end at this flow testing division, this lead-out terminal is electrically connected on flow testing division, in resin-case, accommodate flow testing division, protrude the end of fin and lead-out terminal in this outside; It is characterized in that: in above-mentioned resin-case inside blank part is set, flow testing division is set at this blank part.Though this scheme has improved the precision of measuring to a certain extent, but owing to factors such as air themperature, humidity are not taken into account, even if the error of actual measurement is very little, also still can there be the problem that can't correctly control distributive value, cause air-fuel ratio unreasonable.
Summary of the invention
The present invention solves the same air mass flow of existing in prior technology, also different at the heat that air themperature, humidity are not taken away simultaneously, can not reflect correctly that motor car engine is in different regions, the gas flow of reality under the Various Seasonal environmental baseline, thereby influenced the control accuracy of the electronic fuel injection system, reduced the technical matters of the performance etc. of engine; Provide a kind of reasonable in design, can accurately control distributive value, improved the gas flow sensor and the integrated control method thereof of the integrated control of engine performance.
It is that to solve the existing in prior technology structure comparatively complicated that the present invention also has a purpose, and the cost of manufacture height influences the technical matters in serviceable life etc. of engine; Provide a kind of simple in structure, cost of manufacture is low, and is easy to implement, realizes the gas flow sensor and the integrated control method thereof of the integrated control that gas flow converts automatically.
It is that solution existing in prior technology Signal Processing is very unreasonable that the present invention has a purpose again, causes measuring error easily, the technical matters that system's operation steadily waits inadequately; Provide a kind of signal processing reasonable, measuring accuracy height, the gas flow sensor of the integrated control that system operates steadily and integrated control method thereof.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: the gas flow sensor of integrated control, comprise the flow sensing head, it is characterized in that linking to each other with single-chip microcomputer at described flow sensing head, on single-chip microcomputer, also be connected with Temperature probe and humidity sensor head, above-mentioned flow sensing head, Temperature probe and humidity sensor head all link to each other with the flow conversion processing unit of single-chip microcomputer, and described flow conversion processing unit is connected the flow rate voltage converting unit.
As preferably, described flow sensing head, Temperature probe and humidity sensor head are connected with flow operational amplifier, temperature operational amplifier and humidity operational amplifier respectively.
As preferably, described flow operational amplifier, temperature operational amplifier and humidity operational amplifier link to each other with the A/D converting unit, and described A/D converting unit links to each other with the flow conversion processing unit.
As preferably, also be connected with the storage unit that is used for storage of measurement data between described A/D converting unit and the flow conversion processing unit, the flow conversion processing unit carries out the flow conversion process by the data that query unit is called in the storage unit.
The present invention creatively considers measuring process with factors such as air themperature, humidity, has increased Temperature probe and humidity sensor head on existing gas flow sensor.And the signal that flow sensing head, Temperature probe and humidity sensor head are collected is by the signal that amplifies, analog-to-digital conversion process becomes computing machine to calculate, and the flow value that measures is converted into the actual flow value by computing machine, so that correctly control distributive value.
Above-mentioned device is to realize the integrated control of air mass flow by following method.The integrated control method of gas flow sensor is characterized in that gas stream value, temperature value and humidity value when comprising that following job step: a. detects gas flow sensor work by flow sensing head, Temperature probe and humidity sensor head respectively; B. above-mentioned gas stream value, temperature value and humidity value are inputed to single-chip microcomputer, and carry out the flow conversion process by the flow conversion processing unit of single-chip microcomputer; C. obtain above-mentioned gas flow value, temperature value and humidity value after the flow conversion process through the pairing gas actual flow value in conversion back, and produce the correspondent voltage value according to gas actual flow value.
As preferably, among the above-mentioned step b, after the gas stream value of described flow sensing head, Temperature probe and humidity sensor head gained, temperature value and signal amplification of humidity value process and the A/D conversion process, simulating signal amplified and convert to the storage unit of input single-chip microcomputer after the digital signal, the flow conversion processing unit carries out the flow conversion process by the required data that query unit is called in the storage unit.
As preferably, among the above-mentioned step b, the conversion regime of gas actual flow value is: V
0=K
1V
01V
02+ K
2V
03V wherein
0Be gas actual flow value, V
01The magnitude of voltage that provides by Temperature probe, V are provided
02The magnitude of voltage that provides by the flow sensing head, V are provided
03The magnitude of voltage that provides by the humidity sensor head, K are provided
1Be temperature correction coefficient, K
2Humidity correction factor; Described temperature correction coefficient
V wherein
021Be the temperature value before changing, V
022Be the temperature value after changing, described humidity correction factor
V wherein
031Be the humidity value before changing, V
032It is the humidity value after changing.
Therefore, the present invention has following advantage: 1. and reasonable in design, simple in structure, can accurately control distributive value, improve engine performance; 2. cost of manufacture is low, and is easy to implement, realizes that automatically gas flow converts; 3. signal processing is reasonable, the measuring accuracy height, and system operates steadily.
Description of drawings
Accompanying drawing 1 is a kind of block diagram of the present invention;
Accompanying drawing 2 is a kind of circuit structure diagrams of the present invention.
Among the figure, flow sensing head 1, single-chip microcomputer 2, Temperature probe 3, humidity sensor head 4, flow conversion processing unit 5, flow rate voltage converting unit 6, flow operational amplifier 71, temperature operational amplifier 72, humidity operational amplifier 73, A/D converting unit 8, storage unit 9, query unit 10.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
As depicted in figs. 1 and 2, the gas flow sensor of integrated control comprises the flow sensing head 1, Temperature probe 3 and the humidity sensor head 4 that link to each other with single-chip microcomputer 2.Above-mentioned flow sensing head 1, Temperature probe 3 and humidity sensor head 4 all link to each other with the flow conversion processing unit 5 of single-chip microcomputer.Described flow conversion processing unit 5 is connected flow rate voltage converting unit 6.Flow sensing head 1, Temperature probe 3 and humidity sensor head 4 are connected with flow operational amplifier 71, temperature operational amplifier 72 and humidity operational amplifier 73 respectively.Described flow operational amplifier 71, temperature operational amplifier 72 and humidity operational amplifier 73 link to each other with A/D converting unit 8, and A/D converting unit 8 links to each other with flow conversion processing unit 5.Also be connected with the storage unit 9 that is used for storage of measurement data between A/D converting unit 8 and the flow conversion processing unit 5, flow conversion processing unit 5 carries out the flow conversion process by the data that query unit 10 is called in the storage unit 9.
The gas stream value of flow sensing head, Temperature probe and humidity sensor head gained, temperature value and humidity value amplify through signal and the A/D conversion process after, simulating signal amplified and convert digital signal to after the input single-chip microcomputer carry out conversion process.
In the course of the work, adopt the integrated control method of following gas flow sensor, comprise gas stream value, temperature value and humidity value when following job step: a. detects gas flow sensor work by flow sensing head, Temperature probe and humidity sensor head respectively; B. above-mentioned gas stream value, temperature value and humidity value are inputed to single-chip microcomputer, and carry out the flow conversion process by the flow conversion processing unit of single-chip microcomputer; C. obtain above-mentioned gas flow value, temperature value and humidity value after the flow conversion process through the pairing gas actual flow value in conversion back, and produce the correspondent voltage value according to gas actual flow value.After the gas stream value of flow sensing head, Temperature probe and humidity sensor head gained, temperature value and signal amplification of humidity value process and the A/D conversion process, simulating signal amplified and convert to the storage unit of input single-chip microcomputer after the digital signal, the flow conversion processing unit carries out the flow conversion process by the required data that query unit is called in the storage unit.
In above-mentioned step b, the conversion regime of the gas actual flow value of sensor is: V
0=K
1V
01V
02+ K
2V
03V wherein
0Be gas actual flow value, V
01The magnitude of voltage that provides by Temperature probe, V are provided
02The magnitude of voltage that provides by the flow sensing head, V are provided
03The magnitude of voltage that provides by the humidity sensor head, K are provided
1Be temperature correction coefficient, K
2Humidity correction factor; Described temperature correction coefficient
V wherein
021Be the temperature value before changing, V
022Be the temperature value after changing, described humidity correction factor
V wherein
031Be the humidity value before changing, V
032It is the humidity value after changing.
As shown in Figure 2, V among the figure
01Be the measured value of Temperature probe, V
02Be the gas stream value of flow sensing head, V
03Be the humidity value of humidity sensor head, by temperature operational amplifier 72, flow operational amplifier 71 and humidity operational amplifier 73 input single-chip microcomputers 2, the output terminal of single-chip microcomputer 2 is gas actual flow value V respectively
0Three operational amplifiers: temperature operational amplifier 72, flow operational amplifier 71 and humidity operational amplifier 73 are connected on the bridge circuit.This bridge circuit is formed by connecting by R1, R2, R3, R4, R5 etc.
Specific embodiment described herein only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although this paper has used terms such as flow sensing head 1, single-chip microcomputer 2, Temperature probe 3, humidity sensor head 4, flow conversion processing unit 5, flow rate voltage converting unit 6, flow operational amplifier 71, temperature operational amplifier 72, humidity operational amplifier 73, A/D converting unit 8, storage unit 9, query unit 10 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present invention more easily; They are construed to any additional restriction all is contrary with spirit of the present invention.
Claims (7)
1. the gas flow sensor of an integrated control, comprise flow sensing head (1), it is characterized in that linking to each other with single-chip microcomputer (2) at described flow sensing head (1), on single-chip microcomputer (2), also be connected with Temperature probe (3) and humidity sensor head (4), above-mentioned flow sensing head (1), Temperature probe (3) and humidity sensor head (4) all link to each other with the flow conversion processing unit (5) of single-chip microcomputer, and described flow conversion processing unit (5) is connected flow rate voltage converting unit (6).
2. the gas flow sensor of integrated control according to claim 1 is characterized in that being connected with flow operational amplifier (71), temperature operational amplifier (72) and humidity operational amplifier (73) respectively at described flow sensing head (1), Temperature probe (3) and humidity sensor head (4).
3. the gas flow sensor of integrated control according to claim 2, it is characterized in that linking to each other with A/D converting unit (8) at described flow operational amplifier (71), temperature operational amplifier (72) and humidity operational amplifier (73), described A/D converting unit (8) links to each other with flow conversion processing unit (5).
4. the gas flow sensor of integrated control according to claim 3, it is characterized in that also being connected with the storage unit (9) that is used for storage of measurement data between described A/D converting unit (8) and flow conversion processing unit (5), flow conversion processing unit (5) carries out the flow conversion process by the data that query unit (10) is called in the storage unit (9).
5. the integrated control method of a gas flow sensor is characterized in that comprising following job step:
Gas stream value, temperature value and humidity value when a. detecting gas flow sensor work by flow sensing head, Temperature probe and humidity sensor head respectively;
B. above-mentioned gas stream value, temperature value and humidity value are inputed to single-chip microcomputer, and carry out the flow conversion process by the flow conversion processing unit of single-chip microcomputer;
C. obtain above-mentioned gas flow value, temperature value and humidity value after the flow conversion process through the pairing gas actual flow value in conversion back, and produce the correspondent voltage value according to gas actual flow value.
6. the integrated control method of gas flow sensor according to claim 5, it is characterized in that in above-mentioned step b, after the gas stream value of described flow sensing head, Temperature probe and humidity sensor head gained, temperature value and signal amplification of humidity value process and the A/D conversion process, simulating signal amplified and convert to the storage unit of input single-chip microcomputer after the digital signal, the flow conversion processing unit carries out the flow conversion process by the required data that query unit is called in the storage unit.
7. the integrated control method of gas flow sensor according to claim 6 is characterized in that in above-mentioned step b, and the conversion regime of gas actual flow value is:
V
0＝K
1V
01V
02+K
2V
03；
V wherein
0Be gas actual flow value, V
01The magnitude of voltage that provides by Temperature probe, V are provided
02The magnitude of voltage that provides by the flow sensing head, V are provided
03The magnitude of voltage that provides by the humidity sensor head, K are provided
1Be temperature correction coefficient, K
2Humidity correction factor; Described temperature correction coefficient
V wherein
021Be the temperature value before changing, V
022Be the temperature value after changing, described humidity correction factor
V wherein
031Be the humidity value before changing, V
032It is the humidity value after changing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100496746A CN100458375C (en) | 2006-03-02 | 2006-03-02 | Gas flow sensor with integrated control and its integrated controlling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100496746A CN100458375C (en) | 2006-03-02 | 2006-03-02 | Gas flow sensor with integrated control and its integrated controlling method |
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| CN101029840A true CN101029840A (en) | 2007-09-05 |
| CN100458375C CN100458375C (en) | 2009-02-04 |
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| CNB2006100496746A Expired - Fee Related CN100458375C (en) | 2006-03-02 | 2006-03-02 | Gas flow sensor with integrated control and its integrated controlling method |
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Cited By (9)
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| CN101825032A (en) * | 2009-03-02 | 2010-09-08 | 浙江飞亚电子有限公司 | Method and system for closed-loop control over injection amount of electronic fuel injection internal combustion engine |
| CN101650204B (en) * | 2008-08-11 | 2011-09-28 | 日立汽车系统株式会社 | Mass air flow measurement device |
| CN102914336A (en) * | 2012-10-29 | 2013-02-06 | 杭州市质量技术监督检测院 | Multi-sensor thermal-type gas flow measuring circuit based on MSP430 (mixed signal processor 430) |
| CN104344857A (en) * | 2013-08-05 | 2015-02-11 | 温州大学瓯江学院 | Thermal type automobile air flow meter for realizing temperature and humidity compensation by utilizing single-chip microcomputer |
| CN107131907A (en) * | 2017-05-10 | 2017-09-05 | 苏州容启传感器科技有限公司 | Air mass flow detection device with environment monitoring function |
| CN110307876A (en) * | 2018-03-27 | 2019-10-08 | 阿自倍尔株式会社 | Thermal flow rate sensor device and flow correction method |
| CN110906993A (en) * | 2019-12-12 | 2020-03-24 | 浙江金卡智能水表有限公司 | Flow meter metering temperature compensation method and ultrasonic flow meter |
| CN111148972A (en) * | 2017-09-29 | 2020-05-12 | 日立汽车系统株式会社 | Physical quantity detecting device |
| CN111810308A (en) * | 2020-07-14 | 2020-10-23 | 合肥工业大学 | Novel engine auxiliary fuel injection control method |
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| CN2546856Y (en) * | 2002-06-13 | 2003-04-23 | 蒲德鹏 | Vehicle fuel intelligent metering device |
| CN2566248Y (en) * | 2002-09-06 | 2003-08-13 | 雷励 | Vehicle mounted concealed computerized oil-supply machine test device |
| KR200309477Y1 (en) * | 2003-01-16 | 2003-03-31 | 오상택 | Portable air flow meter for measuring the amount of air to be flowed out |
| JP4321307B2 (en) * | 2004-02-26 | 2009-08-26 | 国産電機株式会社 | Engine throttle opening area estimation method, engine acceleration detection method and acceleration detection apparatus using the estimation method, engine fuel injection control method and fuel injection control apparatus |
| CN1595323A (en) * | 2004-06-18 | 2005-03-16 | 山东建筑工程学院 | Intelligent type heat quantity metering and temperature regulation integrated equipment |
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- 2006-03-02 CN CNB2006100496746A patent/CN100458375C/en not_active Expired - Fee Related
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| CN101650204B (en) * | 2008-08-11 | 2011-09-28 | 日立汽车系统株式会社 | Mass air flow measurement device |
| CN101825032A (en) * | 2009-03-02 | 2010-09-08 | 浙江飞亚电子有限公司 | Method and system for closed-loop control over injection amount of electronic fuel injection internal combustion engine |
| CN102914336A (en) * | 2012-10-29 | 2013-02-06 | 杭州市质量技术监督检测院 | Multi-sensor thermal-type gas flow measuring circuit based on MSP430 (mixed signal processor 430) |
| CN102914336B (en) * | 2012-10-29 | 2014-07-02 | 杭州市质量技术监督检测院 | Multi-sensor thermal-type gas flow measuring circuit based on MSP430 (mixed signal processor 430) |
| CN104344857A (en) * | 2013-08-05 | 2015-02-11 | 温州大学瓯江学院 | Thermal type automobile air flow meter for realizing temperature and humidity compensation by utilizing single-chip microcomputer |
| CN107131907A (en) * | 2017-05-10 | 2017-09-05 | 苏州容启传感器科技有限公司 | Air mass flow detection device with environment monitoring function |
| CN111148972A (en) * | 2017-09-29 | 2020-05-12 | 日立汽车系统株式会社 | Physical quantity detecting device |
| CN111148972B (en) * | 2017-09-29 | 2021-04-23 | 日立汽车系统株式会社 | Physical quantity detecting device |
| CN110307876A (en) * | 2018-03-27 | 2019-10-08 | 阿自倍尔株式会社 | Thermal flow rate sensor device and flow correction method |
| CN110307876B (en) * | 2018-03-27 | 2021-10-29 | 阿自倍尔株式会社 | Thermal flow sensor device and flow correction method |
| CN110906993A (en) * | 2019-12-12 | 2020-03-24 | 浙江金卡智能水表有限公司 | Flow meter metering temperature compensation method and ultrasonic flow meter |
| CN111810308A (en) * | 2020-07-14 | 2020-10-23 | 合肥工业大学 | Novel engine auxiliary fuel injection control method |
| CN111810308B (en) * | 2020-07-14 | 2023-09-22 | 合肥工业大学 | Auxiliary fuel injection control method for engine |
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| CN100458375C (en) | 2009-02-04 |
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