CN1944990A - Device and method for measuring automobile engine air flow with self detection - Google Patents
Device and method for measuring automobile engine air flow with self detection Download PDFInfo
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- CN1944990A CN1944990A CN 200610053312 CN200610053312A CN1944990A CN 1944990 A CN1944990 A CN 1944990A CN 200610053312 CN200610053312 CN 200610053312 CN 200610053312 A CN200610053312 A CN 200610053312A CN 1944990 A CN1944990 A CN 1944990A
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Abstract
The present invention is device and method for measuring automobile engine air flow with self checking. The device includes one measuring device set inside the main intake pipe of the internal combustion engine and one measuring and self checking circuit. The measuring device in through connection form has sensor fixed on the ceramic seat and exposed in the air. The measuring and self checking circuit includes independent CPU, input unit, display unit, output unit, and operating and processing module connected to the sensor. The device compares the measured zero point data with the input zero point data to calculate and correct the zero point drift, measures the voltage change caused by the air flow and calculates the air flow rate. The present invention has high measurement precision, short response time, small heat inertia of the chip and other advantages.
Description
Technical field
The present invention relates to a kind of air-flow measurement device and method of vehicle, especially relate to a kind of automobile engine air flow measuring device and method of the band self check that can detect automatically and show.
Background technique
The thermal type gas quality flow measurement is to utilize heat transfer theory, and exchange heat concerns the technology of measuring flow between the outer heating unit of object that heats in fluid in promptly flowing and the heat source fluid or sounding pipe.
In the tradition calorimetric formula principle, usually adopt the hot fluid sensor to comprise heater and temperature transducer two-part, be symmetrically distributed a pair of or several in the heating wire upstream and downstream to platinum matter responsive to temperature silk, and, adopt microbridge formula hanging structure between heating wire and the responsive to temperature silk in order to improve the thermal insulation between the unit component.
Flowmeter is used for measuring machine motor-car intake air flow, and then be used for engine control system and determine that combustion condition, control are empty so than, starting and igniting etc., air inflow that engine control system then measures according to air mass flow and engine speed at that time come and predefined fuel feeding program relatively after, calculate required fuel delivery and relative discharge time, common this air mass flow in respect of one group not with the hot line of overcoat, be suspended on internal-combustion engine and suck among the bypass of air-flow process, to measure air mass flow.Though the hot line with overcoat does not have the high advantage of speed of response, defectiveness is because the back-fire in the air bypass makes them be damaged easily.
In order to overcome this defective, several schemes had been proposed, for example described in the Japanese patent publication number 16259/82, adopt a kind of hot wire air flowmeter with Venturi tube, Venturi tube is contained in the main airway that internal-combustion engine sucks the air-flow process, and bypass communicates with main airway, makes can shunt by the portion of air of air flue firmly, utilize Venturi tube main airway upper reaches part and, make the air-flow of process form one by-pass flow near Venturi tube pressure difference between the main airway at narrow position.In addition, also have a hot-wire airflow sensor that is contained in the bypass, monitor bypass gas flow,, determine to suck the flow of the whole air of internal combustion chamber according to the flow velocity that air flow sensor obtains.Employing has the hot wire air flowmeter of bypass that a problem is arranged: when tested air-flow was pulsed flow, the operating lag of hot line made to record the result less than the actual average air mass flow.
In order to address this problem, in the Japanese patent publication number 135916/83 scheme was proposed once, make the distance between the suction port and air outlet in the bypass, compare with measuring the distance that the main airway axial distance obtains, increase to some extent, with the error in the compensated measurement.In this hot wire air flowmeter, the air-flow that enters Air flow meter is divided into two strands at the suction port or the connecting port of bypass, has one air-flow to continue by main airway, and another burst air communication is crossed bypass, last these two strands of air-flows converge mutually in the air outlet of bypass or the mouth that confluxes, and flow out Air flow meter.But also there is shortcoming in this hot wire air flowmeter.Will be less than air mass flow when the tube wall of Air flow meter is heated through main airway through the air mass flow of bypass, thus make air temperature in the bypass be higher than air temperature in the main airway.Consequently, the air expansion in the bypass, bypass increases the resistance of air-flow, and the air mass flow that makes the process bypass at last is less than the air mass flow through main airway.Therefore, the hot wire air flowmeter of said structure has such defective: Air flow meter conduit wall cold and hot reduces the numerical precision of the air mass flow that Air flow meter records.
For overcoming the defective of above-mentioned original design, the air mass flow that patent of invention publication No.: CN 85 1 06537A propose is in respect of an air flow measurement pipe that is contained in the main airway, and Guan Youyi suction port of this air flow measurement and air outlet are as bypass; In addition, also have a hot line or an air flow sensor that is contained in the air flow measurement pipe, in fact this air flow sensor is contained in the core of main airway section, in order to detect the air velocity through bypass.Like this, in fact the ratio of air mass flow of passing through bypass and the air mass flow of passing through main airway remained unchanged,, eliminate the danger that measurement error takes place no matter whether sucking pipe is heated.
According to existing technology and use condition, the effective self check when also not realizing the sensor measurement precise decreasing.
Summary of the invention
Main purpose of the present invention is to overcome above-mentioned prior art can't be carried out effective self check before the sensor measurement air mass flow deficiency, and a kind of automobile engine air flow measuring device and method that detects the band self check of dead-center position by contrast is provided.
The present invention has also solved in the prior art contaminated or have foreign matter to produce the deficiency that error or data can't be handled attached to the data that cause sensor acquisition on the sensor owing to sensor, a kind of accuracy that can effectively solve the data that sensor records is provided, need not to consider that sensor whether is contaminated and cause the automobile engine air flow measuring device and the method for the band self check of problem.
The present invention has also solved prior art and air ventilation is caused hinder to have reduced flow velocity, may produce the problem of turbulent flow, provides a kind of effective solutions turbulent, reduces the automobile engine air flow measuring device and the method for band self check of the resistance of air ventilation.
A further object of the present invention has solved in the prior art hot wire type and has measured in low speed is measured, and the unsettled deficiency of measurement performance provides a kind of and adopts heat distribution principle, measures the automobile engine air flow measuring device and the method for stable band self check.
The present invention has also solved and has made inconvenience in the prior art, and baroque problem provides a kind of simple in structure, easily manufactured, the automobile engine air flow measuring device and the method for the band self check that cost of production and maintenance cost are lower.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of automobile engine air flow measuring device and method with self check, this measuring device is arranged in the air-intake of combustion engine main pipe, device inside is provided with sensor, it is characterized in that: described sensor is formed with several electric heating heap element arrangements by several elements of heating; Sensor and control system for internal combustion engine and vehicle-mounted microprocessor control unit are connected with between (being called for short MCU) and measure and self-checking circuit, described measurement and self-checking circuit band be central processing unit (CPU) independently, and central processing unit (CPU) is provided with signal input apparatus, signal output apparatus and self check display unit.When gas stream out-of-date, the temperature variation that is positioned at the electric heating heap element of the element upstream of heating along gas flow direction increases greatly with the change of flow, measure temperature variation that gas flow produced by its surface, region respectively and temperature distribution changed at N electric heating heap of upstream array distribution and be converted to voltage signal, the comprehensive output in voltage signal series connection back and the gas flow of the generation of N electric heating heap are the voltage signal of single value nonlinearity curved line relation, the measurement air mass flow; If MCU allows, the self check display unit can be arranged on the automobile instrument panel, if do not allow then the self check display unit can be set voluntarily in place, the form of device can adopt various ways, shows or the mark identical with vehicle water-thermometer display mode shows or directly be exactly to adopt signaling lamp to show as the screen captions.
As preferably, described sensor is the total silicon integrated microstructure device that adopts micro-electronic mechanical system technique (being called for short MEMS) to make based on the thermal distribution principle of measurement, wherein, the element of heating that is arranged on island shape single crystal silicon one side is an electric heating wire, be arranged on opposite side parallel with electric heating wire be the electric heating heap, respectively be provided with a feeler at the two ends of electric heating wire and electric heating heap.Only the electric heating heap is set, when temperature variation, only need measures the temperature variation analogue signal of a side, when follow-up analog-to-digital conversion and signal differential operational and comparison operation in a side, only need a spot of data of computing, the probability of makeing mistakes is little, and circuit is simple, and the speed of computing improves; The maximum characteristics of MEMS technology are to improve its sensitivity and Frequency Response by the scaled microization with device or system, and reduce device quality and inertia significantly, realize low-cost manufacturing the in enormous quantities, MEMS technology is incorporated in the design of thermal flow sensor, can realize the microminiaturized and accurate control electric heating wire of temperature sensor and the micron order spacing between the electric heating heap easily, meanwhile, the microminiaturized feature of MEMS device can reduce the thermal inertia of chip significantly, realizes low power consumption, high frequency sound requirement.
Perhaps adopt another kind of scheme, described sensor is the total silicon integrated microstructure device that adopts MEMS to make based on the thermal distribution principle of measurement, wherein, being arranged on the middle element of heating of island shape single crystal silicon is electric heating wire, electric heating heap is arranged on the both sides of the element of heating and parallel with electric heating wire, respectively is provided with a feeler at the two ends of electric heating wire and electric heating heap.Adopt symmetric arrangement electric heating heap, the zero data signal that sensor records when air mass flow is zero, the voltage signal absolute value by two Side electric heating heap with computing and original zero data relatively, can improve flow measurement range during the measurement air mass flow.
Wherein, described measuring device is cylindrical straight-through connecting body, and connecting body is provided with the slotting dish of end belt lacing, is arranged on the sensor of inserting on the dish and directly exposes in air passageways.Straight-through purpose is to ventilate smooth and easyly, can not produce the phenomenon of turbulent flow, and sensor is placed on the passage and can reacts the very first time, reduces the response time, improve response accuracy, and bypass structure is simple, and easy to make, cost is low; The data that sensor records need to be delivered to MCU and engine control system by transmission line through handling, and in the end of inserting dish the street corner are set, and simple in structure, operation and maintenance is convenient.
As preferably, be provided with slideway in the middle of the described connecting body, it is elongated to insert dish, and the centre is provided with the through hole coaxial with connecting body.Slideway structure can make things convenient for sensor in time to change because of malfunctioning or damage; Through hole and coaxial the mobile of air of can not upsetting of connecting body, the data that sensor records when measuring conform to actual, and lag time is short; The through hole coaxial with connecting body ventilates smooth and easy.
Described slotting dish is provided with the measurement that links to each other with sensor and the circuit board of self-checking circuit.Measurement and self-checking circuit and sensor distance are short, have reduced the decay that signal transmits in circuit.
Wherein, described measurement comprises the electric heating heap signal operation puocessing module that is connected with sensor with self-checking circuit, and inside is provided with signal computing circuit and Signal Pretreatment amplification circuit; Conversion is connected to central processing unit (CPU) (E) to electric heating heap signal after the processing through D/A.The data on flows of the zero data that sensor records when air mass flow is zero when air mass flow is arranged can't directly compare, and at first need could be in central processing unit (CPU) independently compare with the zero data and the calibration curve data of input respectively by handling.
Adopt first kind of sensor construction, wherein, be connected with constant power source on the described sensor, sensor is arranged on to be inserted on the middle hole wall of dish, is the electric heating heap away from engine intake valve, and electric heating wire is arranged near engine intake valve.Air blows into into motor toward electric heating wire from the electric heating heap, and the there temperature of the close electric heating wire of electric heating heap is higher than the there away from electric heating wire, and the both sides of electric heating heap can produce the temperature difference, obtain the variation of voltage by the variation of the temperature difference, thereby measure air mass flow; The stability that constant power source has guaranteed working sensor is set on the sensor.
The calibration curve of an original zero data and voltage signal and gas flow relativity is provided for when described method comprises the following steps: a. initial setting up central processing unit (CPU) independently; B. when MCU shows that engine charge main pipe air mass flow is zero, the sensor zero data; C. whether in allowed limits the circuit zero data and the original zero data that relatively record of central processing unit (CPU) independently draw variation; Exceeded the scope that allows and on display unit, has shown the variation more emat sensor that goes beyond the scope if d. change; If e. change in allowed limits, realize zero correction by independent central processing unit (CPU); F. when the gas flows through sensor, electric heating heap region temperature distribution changes; G. the variation of sensor measurement electric heating stack temperature and the variation of the voltage that causes forms voltage and air mass flow relativity; H. measure the air flow rate of the sensor of flowing through by the corresponding relation of computing and air flow flow.
Wherein, described signal amplifies through computing and signal, and converts digital signal to by analog-digital converter, and this digital signal is independently being carried out calculation process with the initial data contrast and by corresponding relation in the central processing unit (CPU).
N electric heating heap in the upstream array distribution measured the temperature variation that gas flow is produced by its surface, region respectively, output heat that the temperature variation of element upstream produces voltage signal, measure air mass flow, voltage signal output and gas flow are the single value nonlinearity curved line relation, available following mathematical model is described, for a simple one dimension heat type fluid sensor, the temperature of heating wire can be expressed as:
Th in the formula-heating wire temperature
P-heating power
KF-fluid thermal conductance
Wh-heating wire width
Lh-heating wire length
δ-thermal boundary layer
V-mean velocity
α-fluid thermal diffusivity
Wherein k can be expressed as:
Ksi in the formula-backing material thermal conductivity
Td-diaphragm thickness
Then the temperature difference between upstream electrical thermal reactor cold junction and the hot junction is expressed as:
ΔT
up＝T
h[exp(γ
1l
u1)-exp(γ
1l
u2)] (3)
Lu1-heating wire is to the distance of upstream electrical thermal reactor cold junction in the formula
Lu2-heating wire can be expressed as to the distance in the upstream electrical thermal reactor hot junction resultant signal that the temperature variation of element upstream produces of heating:
Can draw from following formula, if when sensor surface is subjected to polluting, following parameter changes:
δ-thermal boundary layer
α-fluid thermal diffusivity
So the zero-point voltage signal when gas flow rate is static is compared with original zero data and is had drift.
If the sensor internal micro structural component is damaged, no matter be heat in the different electric heating heap element in element or an array distribution N position any one or a plurality of unusual, the zero-point voltage signal when can to occur gas flow rate equally be static is compared with original zero data and is had drift.Thereby, can come the described microstructure thermal distribution of self-check formula air flow sensor whether to cause micro-structured component unusual by monitoring sensor zero-point voltage signal drift effectively because air plankton impacts, perhaps, adjust or change the prompting of safeguarding automobile inner air flow measurement parts so that in time provide because air oiliness composition causes the flow transducer surface contamination.
Therefore, the invention has the beneficial effects as follows: the passage in the middle of the connecting body is arranged to through hole, resistance when having reduced air flows and streaming, make simple, cost is low, self-checking circuit makes sensor in use can not produce error because of the pollution that is subjected to sensor surface, guaranteed the degree of accuracy of sensor, and can know the working condition of sensor by display unit, whether sensor has exceeded allowed band needs to change, the employing heat distribution principle is measured, improved the low speed unstability that the hot wire type measures, rely on the MEMS technology to realize that micro structural component makes air-flow measurement scope and speed of response obviously improve, possess the characteristic of coming self check by the zero-point voltage signal drift, thereby can carry out the measurement of air mass flow.
Description of drawings
Accompanying drawing 1 is a kind of user mode figure of the present invention;
Accompanying drawing 2 is cut-away views of a kind of sensor of the present invention;
Accompanying drawing 3 is principle schematic of a kind of electric heating heap signal operation puocessing module of the present invention;
Accompanying drawing 4 is sectional views of a kind of measuring device of the present invention;
Accompanying drawing 5 is plan views of a kind of measuring device of the present invention;
Accompanying drawing 7 is a kind of sensor measurement schematic diagrams of the present invention;
Among the figure: 1, the air-intake of combustion engine main pipe, 2, sensor, 3, measuring device, 4, measure and self-checking circuit 5, the electric heating heap, 6, island shape single crystal silicon, 7, electric heating wire, 8, feeler, 9, the output of electric heating heap, 10, input, 11, connecting body, 12, circuit board, 13, joint, 14, the industrial ceramics substrate, 15, insert dish, B, constant power source, C, the calculation process module, D, analog-to-digital converting module, E, central processing unit (CPU), G, display unit, I, input device, O, output unit, X, change curve, Y, primitive curve, U, the voltage output signal, L, air mass flow.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment 1: be provided with measuring device 3 in the air-intake of combustion engine main pipe, device is provided with sensor 2, sensor links to each other with constant power source B, the output terminal of sensor links to each other with self-checking circuit 4 with measurement, comprise the operation of data puocessing module C that processes sensor records on measurement and the self-checking circuit, puocessing module links to each other with central processing unit (CPU) E through analog-to-digital converting module D, be connected with output unit O and display unit G on the central processing unit (CPU), central processing unit (CPU) also is connected with input device I, be transferred to central processing unit (CPU) by the analog-to-digital converting module conversion after the data that the arithmetic circuit processes sensor records, compare in corresponding output unit or display unit output (referring to accompanying drawing 1) with the data of input device input;
Described sensor is that heat accordingly element and electric heating heap 5 are set on the island shape single crystal silicon 6, the described element of heating is an electric heating wire 7, electric heating wire is arranged on a side of island shape single crystal silicon, it is parallel with electric heating wire that the electric heating heap is arranged on opposite side, the two ends of electric heating wire and electric heating heap are respectively equipped with and are connected feeler 8, and sensor is whole for adopting the microstructure (referring to accompanying drawing 2) of micro-electronic mechanical system technique;
Measuring device is cylindrical straight-through connecting body 11, be provided with slideway in the middle of the connecting body, slideway is provided with the slotting dish 15 of end belt lacing 13, insert and be provided with the sealing that seal arrangement guarantees pipeline between dish and the connecting body, it is elongated to insert dish, being arranged on the sensor of inserting on the dish is fixed on the industrial ceramics substrate 14, directly expose in air passageways, the centre of inserting dish is provided with the through hole coaxial with connecting body, the industrial ceramics substrate is arranged on the wall of through hole, sensor is according to the intake valve of electric heating wire end towards motor, and the electric heating heap is arranged (referring to accompanying drawing 4 accompanying drawings 5) away from the intake valve of motor;
The engine air capacity method of measurement of band self check: the curve signal of an original zero data and voltage signal and gas flow relativity is provided for during a. initial setting up central processing unit (CPU) independently; By input device I input 10; B. when MCU showed that engine charge main pipe air mass flow is zero, sensor recorded zero data; C. whether in allowed limits circuit electric heating heap output 9 data and the original zero data that relatively record of central processing unit (CPU) independently draw variation; Exceeded the scope that allows and on display unit, has shown the variation more emat sensor that goes beyond the scope if d. change; If e. change in allowed limits, by independently central processing unit (CPU) realization zero correction; F. when the gas flows through sensor, electric heating heap region temperature distribution changes, and variation of temperature curve X compares with primitive curve Y and can produce drift (referring to accompanying drawing 7) zero point when having air to pass through; G. the variation of the voltage that causes because of the variation of electric heating stack temperature of sensor measurement; H. measure the air flow rate of the sensor of flowing through by the corresponding relation of computing and air flow flow, the voltage output signal U can reduce (referring to accompanying drawing 3 accompanying drawings 6) with the increase of air mass flow L.
Embodiment 2: described sensor is for adopting the microstructure of micro-electronic mechanical system technique, be provided with the element electric heating wire 7 of heating in the middle of the shape single crystal silicon of island, electric heating heap 5 is arranged in the both sides of electric heating wire and parallel with electric heating wire, because the electric heating heap is arranged in both sides, for obtaining accurate data, in described arithmetic circuit, increase absolute value and arithmetic circuit, by comparing with zero point and the value imported of recording with value, draw the drift at zero point, thereby realize self check and on display unit, show; Other are identical with embodiment 1.
Claims (10)
1, a kind of automobile engine air flow measuring device with self check, this measuring device is arranged in the air-intake of combustion engine main pipe, device inside is provided with sensor, it is characterized in that: described sensor is formed with several electric heating heap element arrangements by several elements of heating; Be connected with between sensor and control system for internal combustion engine and the vehicle-mounted single-chip microcomputer and measure and self-checking circuit (4), described measurement and self-checking circuit band be central processing unit (CPU) (E) independently, and central processing unit (CPU) is provided with signal input apparatus (I), signal output apparatus (O) and self check display unit (G).
2, the automobile engine air flow measuring device of band self check according to claim 1, it is characterized in that the total silicon integrated microstructure device of described sensor for adopting micro-electronic mechanical system technique to make based on the thermal distribution principle of measurement, wherein, the element of heating that is arranged on island shape single crystal silicon (6) one sides is electric heating wire (7), be arranged on opposite side parallel with electric heating wire be electric heating heap (5), respectively be provided with a feeler (8) at the two ends of electric heating wire and electric heating heap.
3, the automobile engine air flow measuring device of band self check according to claim 1, it is characterized in that the total silicon integrated microstructure device of described sensor for adopting micro-electronic mechanical system technique to make based on the thermal distribution principle of measurement, wherein, being arranged on the middle element of heating of island shape single crystal silicon is electric heating wire, electric heating heap is arranged on the both sides of the element of heating and parallel with electric heating wire, respectively is provided with a feeler at the two ends of electric heating wire and electric heating heap.
4, the automobile engine air flow measuring device of band self check according to claim 1, it is characterized in that described measuring device is a cylindrical straight-through connecting body (11), connecting body is provided with the slotting dish (15) of end belt lacing (13), is arranged on the sensor of inserting on the dish (2) and directly exposes in air passageways.
5, the automobile engine air flow measuring device of band self check according to claim 4 is characterized in that being provided with slideway in the middle of the described connecting body, and it is elongated to insert dish, and the centre is provided with the through hole coaxial with connecting body.
6, the automobile engine air flow measuring device of band self check according to claim 5 is characterized in that described slotting dish is provided with the measurement that links to each other with sensor and the circuit board (12) of self-checking circuit.
7, the automobile engine air flow measuring device of band self check according to claim 6, it is characterized in that described measurement and self-checking circuit comprise the electric heating heap signal operation puocessing module (C) that is connected with sensor, inside is provided with signal computing circuit and Signal Pretreatment amplification circuit; Conversion is connected to central processing unit (CPU) (E) to electric heating heap signal after the processing through D/A.
8, according to the automobile engine air flow measuring device of claim 1 or 2 or 4 or 5 or 6 or 7 described band self checks, it is characterized in that being connected with constant power source on the described sensor, sensor is arranged on to be inserted on the middle through-hole wall of dish, be the electric heating heap away from engine intake valve, electric heating wire is arranged near engine intake valve.
9, a kind of automobile engine air flow method of measurement with self check is characterized in that described method comprises the following steps:
The calibration curve of an original zero data and voltage signal and gas flow relativity is provided a. for during initial setting up central processing unit (CPU) independently;
B. when MCU showed that engine charge main pipe air mass flow is zero, sensor recorded zero data;
C. whether in allowed limits the circuit zero data and the original zero data that relatively record of central processing unit (CPU) independently draw variation;
Exceeded the scope that allows and on display unit, has shown the variation more emat sensor that goes beyond the scope if d. change;
If e. change in allowed limits, realize zero correction by independent central processing unit (CPU);
F. when the gas flows through sensor, electric heating heap region temperature distribution changes;
G. the variation of sensor measurement electric heating stack temperature and the variation of the voltage that causes forms voltage and air mass flow relativity;
H. measure the air flow rate of the sensor of flowing through by the corresponding relation of computing and air flow flow.
10, the automobile engine air flow method of measurement of band self check according to claim 9, it is characterized in that described signal amplifies through computing and signal, and converting digital signal to by analog-digital converter, this digital signal is independently being carried out calculation process with the initial data contrast and by corresponding relation in the central processing unit (CPU).
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101393044B (en) * | 2007-09-20 | 2011-03-30 | 株式会社山武 | Flow sensor unit |
| CN102636615A (en) * | 2012-04-25 | 2012-08-15 | 梅思安(中国)安全设备有限公司 | Error preventing method for zero point or gain calibration of solid and portable gas detector |
| CN103309261A (en) * | 2013-06-25 | 2013-09-18 | 王文博 | Novel method for eliminating indication errors of automobile instruments |
| CN103776956A (en) * | 2012-10-18 | 2014-05-07 | 河南宏天实业有限公司 | Gas detection digital bridge and intelligent processing technology |
| CN104879228A (en) * | 2015-06-12 | 2015-09-02 | 潍柴动力股份有限公司 | Zero drift self-adaption method for pressure sensor of engine |
| CN107449476A (en) * | 2017-08-15 | 2017-12-08 | 合肥移顺信息技术有限公司 | A kind of flowmeter based on thermal resistance type |
| CN108458852A (en) * | 2018-05-24 | 2018-08-28 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of high-temperature tunnel quick changeable temperature potential device and alternating temperature voltage-transforming method |
| CN112325994A (en) * | 2020-11-04 | 2021-02-05 | 合肥科迈捷智能传感技术有限公司 | Automatic correction method for zero offset of differential pressure flowmeter |
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| CN85106537A (en) * | 1985-08-30 | 1987-03-18 | 株式会社日立制作所 | air flowmeter |
| US5753815A (en) * | 1994-11-17 | 1998-05-19 | Ricoh Company, Ltd. | Thermo-sensitive flow sensor for measuring flow velocity and flow rate of a gas |
| CN1077283C (en) * | 1996-08-23 | 2002-01-02 | 李韫言 | Thermal type flow sensor for very fine working |
| JP3461469B2 (en) * | 1999-07-27 | 2003-10-27 | 株式会社日立製作所 | Thermal air flow sensor and internal combustion engine controller |
| DE10133524A1 (en) * | 2001-07-11 | 2003-01-30 | Bosch Gmbh Robert | Method and device for correcting the dynamic error of a sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101393044B (en) * | 2007-09-20 | 2011-03-30 | 株式会社山武 | Flow sensor unit |
| CN102636615A (en) * | 2012-04-25 | 2012-08-15 | 梅思安(中国)安全设备有限公司 | Error preventing method for zero point or gain calibration of solid and portable gas detector |
| CN103776956A (en) * | 2012-10-18 | 2014-05-07 | 河南宏天实业有限公司 | Gas detection digital bridge and intelligent processing technology |
| CN103309261A (en) * | 2013-06-25 | 2013-09-18 | 王文博 | Novel method for eliminating indication errors of automobile instruments |
| CN104879228A (en) * | 2015-06-12 | 2015-09-02 | 潍柴动力股份有限公司 | Zero drift self-adaption method for pressure sensor of engine |
| CN107449476A (en) * | 2017-08-15 | 2017-12-08 | 合肥移顺信息技术有限公司 | A kind of flowmeter based on thermal resistance type |
| CN108458852A (en) * | 2018-05-24 | 2018-08-28 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of high-temperature tunnel quick changeable temperature potential device and alternating temperature voltage-transforming method |
| CN108458852B (en) * | 2018-05-24 | 2024-03-29 | 中国航空工业集团公司沈阳空气动力研究所 | Rapid temperature and pressure changing device and temperature and pressure changing method for high-temperature wind tunnel |
| CN112325994A (en) * | 2020-11-04 | 2021-02-05 | 合肥科迈捷智能传感技术有限公司 | Automatic correction method for zero offset of differential pressure flowmeter |
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| CN100424332C (en) | 2008-10-08 |
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