WO2013046981A1 - 気体流量測定装置 - Google Patents
気体流量測定装置 Download PDFInfo
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- WO2013046981A1 WO2013046981A1 PCT/JP2012/070807 JP2012070807W WO2013046981A1 WO 2013046981 A1 WO2013046981 A1 WO 2013046981A1 JP 2012070807 W JP2012070807 W JP 2012070807W WO 2013046981 A1 WO2013046981 A1 WO 2013046981A1
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- gas flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/64—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by measuring electrical currents passing through the fluid flow; measuring electrical potential generated by the fluid flow, e.g. by electrochemical, contact or friction effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
- G01F1/6842—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow with means for influencing the fluid flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/696—Circuits therefor, e.g. constant-current flow meters
- G01F1/6965—Circuits therefor, e.g. constant-current flow meters comprising means to store calibration data for flow signal calculation or correction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F5/00—Measuring a proportion of the volume flow
Definitions
- the present invention relates to a gas flow rate measuring device, and more particularly, to an intake air flow rate measurement of an engine.
- One type of device for measuring the intake air flow rate is a heating resistor type gas flow rate measurement device. It is desirable that the output signal of the heating resistor type gas flow measuring device has a small change in the output signal even when the temperature changes, that is, a temperature-dependent error is small.
- a heating resistor type gas flow measuring device has table data on air flow rate-output characteristics, and the table data area is divided to change the output characteristic correction formula for each air flow area.
- the table data area is divided by dividing the low air flow rate range more finely than the high flow rate range. Thereby, the low flow rate accuracy can be improved without extremely increasing the number of data in the table.
- Patent Document 1 in the correction of the gas flow rate signal and the correction of the gas temperature dependency, the correction is performed using a table instead of the interpolation by the function, thereby correcting the nonlinearity of the gas flow rate signal and the gas temperature dependency.
- the correction accuracy is determined according to the number of data. Therefore, the higher the number of data, the higher the accuracy of correction. However, the smaller the number of data, the larger the correction error. .
- An object of the present invention is to improve the correction accuracy when correcting the flow rate signal.
- the gas flow rate measuring device detects the current flowing in one or a plurality of resistors arranged in the gas flow path or the voltage generated in accordance with the current by detecting the gas.
- a gas flow rate detection circuit that outputs a gas flow rate detection signal corresponding to the gas flow rate flowing in the flow path, and a gas temperature detection element for detecting the gas temperature in the gas flow path or a substrate temperature provided inside the integrated circuit,
- a gas flow rate measuring device for correcting characteristics of the gas flow rate detection signal based on a temperature detection signal obtained from the gas temperature detection element or the substrate temperature detection element, Signal conversion means for correcting a characteristic curve deviating from a target characteristic of the gas flow rate detection signal by a certain amount or more is provided.
- FIG. 2 is a cross-sectional view taken along the line AA ′ in FIG. 1.
- FIG. 5 is a conversion diagram of a detection signal in the first embodiment.
- FIG. 3 is a view of mounting an air flow measuring device having an ⁇ -type auxiliary passage shape on the body.
- FIG. 10 is a conversion diagram of a detection signal in the second embodiment. The conversion diagram of the detection signal in 3rd Embodiment. The coordinate transformation combination figure in a 3rd embodiment.
- an air flow rate measuring device 2 provided with an intake air temperature detecting element 1 is inserted into a gas flow path body 3.
- an air flow rate measuring device 2 is configured to be attached to a gas passage body 3 forming an intake passage of an internal combustion engine and exposed to a gas 8 flowing through a main passage 6. Therefore, a gas temperature detecting element (also called a thermistor or a gas temperature measuring resistor) 1 is provided on the upstream side of the air flow measuring device 2 so as to be directly exposed to the intake fluid. Further, the gas flow rate detecting element 4 is attached on the substrate 5, and only the portion where the gas flow rate detecting element 4 is attached is installed in the sub-passage 7. The substrate 5 is also provided with a gas temperature detection circuit 22 and is isolated from the auxiliary passage 7.
- the gas temperature detected by the gas temperature detection element 1 is converted into a voltage signal by the gas temperature detection circuit 22 on the substrate 5 and input to the analog-digital converter AD314.
- the integrated circuit 21 is provided with a temperature sensor 12 in the integrated circuit for detecting a substrate temperature for detecting a temperature corresponding to the substrate 5. Thereby, each temperature of gas temperature and the air flow measuring device 2 is detectable.
- the gas temperature detection circuit 22 is configured by connecting the gas temperature detection element 1 and the fixed resistor 9 arranged in the intake passage in series, and a constant voltage output from the regulator 23 is supplied to the gas temperature detection circuit 22.
- a digital value obtained by converting the gas flow rate detection signal Ta from the gas flow rate detection element 4 by the analog-digital converter AD1AD11, and a substrate temperature signal from the temperature sensor 12 in the integrated circuit are converted from analog to digital.
- the digital value converted by the device AD2 ⁇ ⁇ ⁇ ⁇ 13, the digital value converted from the gas temperature signal Ta from the gas temperature detecting element 1 by the analog-digital converter AD3 14, and these digital signals are used for correction by a table.
- a table is a table in which correction constants for standardized gas flow rate signals and gas temperature signals are arranged in a grid, and a method for calculating correction values according to the flow rate signal and the temperature signal using this table. This is called table correction.
- correction constants used for table correction are corrected and calculated by the digital signal processing DSP 10 based on constants stored in the PROM 15 in advance.
- the digital values of the gas flow rate signal and the gas temperature signal corrected in this way are converted into analog signals using the digital-analog converter DA1 16 and the digital-analog converter DA2 18, and are output as voltage signals.
- the digital value of the gas flow rate signal is converted into an analog signal using the free running counter FRC1 17, it is output as a frequency signal.
- the digital value of the gas temperature signal is converted into an analog signal using the free running counter FRC 2 19, it is output as a frequency signal.
- the selection of the digital-analog converter DA1 16 and the free-running counter FRC1 17 can be selected by the setting of the multiplexer MUX1 ⁇ 24, and the selection of the digital-analog converter DA2 18 and the free-running counter FRC2 ⁇ ⁇ 19 is selected by the setting of the multiplexer MUX2 25 it can.
- the entire circuit is driven by the oscillator 20. Further, the air flow rate measuring device is electrically connected to the ECU 26.
- FIG. 4 shows the gas flow rate detection signal and the target output.
- the fluid includes laminar flow and turbulent flow, and there is a point where the laminar flow transitions to turbulent flow. Due to this influence, a characteristic curve occurs in the gas flow rate detection signal.
- This characteristic curve differs depending on the structure of the air flow rate measuring device, particularly the structure in the vicinity of the gas flow rate detecting element 4 and the location where the characteristic curve occurs.
- the characteristic curve refers to a curve that deviates more than a certain amount from the target characteristic shown in FIG.
- Fig. 5 shows a method for correcting characteristic bending.
- a switch that can select whether to use the substrate temperature signal Tl or the gas temperature signal Ta is used for the temperature signal. This switch can be switched by a constant in the PROM 15.
- the gas flow rate detection signal Q is converted to Q1 by the first coordinate conversion table, and the gas temperature detection signal Ta is converted to T1 by the second coordinate conversion table.
- the first coordinate conversion table is a table for characteristic conversion of the gas flow rate signal Q and is a table having 17 lattice points.
- the second coordinate conversion table is a table for converting the characteristics of the gas temperature signal Tl and having five lattice points. Since the characteristics of the gas flow rate signal and the gas temperature signal are different, a coordinate conversion table having a different coordinate conversion table is used. In this way, the original characteristic is subjected to coordinate conversion, and the characteristic-converted signals Q1 and T1 are used, so that the correction in Q1 and T1 is more correct in the correction table than in the correction table using Q and Ta. The resolution near the bend is improved.
- the output Q2 corrected by the correction table is output in addition to the original gas flow rate detection signal Q.
- FIG. 6 shows the characteristics before and after coordinate conversion. By converting the characteristic curve portion by coordinate conversion, the number of lattices assigned to the characteristic curve portion is increased, and the resolution is improved.
- FIG. 7 is a graph showing the gas flow rate signal Q on the horizontal axis and the difference ⁇ Y between the target output and the gas flow rate detection signal detected by the gas flow rate detection element 4 on the vertical axis.
- this graph shows the difference when the gas flow rate detection signal is zero-span adjusted at two points of high flow rate and low flow rate with respect to the target output.
- the value of equation (1) is used to determine the characteristic curve.
- S is a value indicating the magnitude of the characteristic curve, and the magnitude of the characteristic curve is determined based on this value, and it is determined where the characteristic curve exists in the range of ab.
- S is a value indicating the magnitude of the characteristic curve
- the magnitude of the characteristic curve is determined based on this value, and it is determined where the characteristic curve exists in the range of ab.
- a and b are determined so as to cover the characteristic curve. This is because S cannot be calculated correctly when only half of the characteristic curve is between a and b. Therefore, the interval between a and b is determined by the size of the characteristic curve. When the characteristic curve is large, the distance between a and b is large. When the characteristic curve is small, the distance between a and b is small.
- Q is the gas flow rate
- ⁇ Y is a value obtained by zero-spanning the output characteristic of the corrected gas flow rate detection signal and the output of the gas flow rate signal of the resistor, and search for the characteristic curve.
- the minimum value of the region (range) is a
- the maximum value of the characteristic curve search region is b
- the number of divisions between a and b is n
- [Delta] Y max the value at most [Delta] Y is greater between the sum of a value obtained by dividing the a and b in the division number of the product of the values [Delta] Y max when most [Delta] Y is smaller between a and b S
- the location of the characteristic curve is searched by a and b
- the size of the characteristic curve is determined by the magnitude of S, and when the absolute value
- the gas flow rate detection signal is compensated so that the value of
- the conversion amount Y is determined from S representing the magnitude of the characteristic curve, and the table representing the relationship between the input X and the conversion amount Y is a plurality of data (the input is n from x1 to xn, the conversion amount is n from y1 to yn). ).
- the converted output ⁇ Y is calculated by adding the conversion amount Y calculated by the table to the input X.
- the number n of data in the table is large, the correction accuracy is improved, but the data capacity written in the PROM 15 is increased and the cost is increased.
- the number of data n is small, the amount of data written into the PROM 15 is small, so that an increase in cost can be prevented, but the correction accuracy decreases. For this reason, the number of data n used in the table needs to be set to an optimum number of data based on the magnitude and number of characteristic curves of the gas flow rate detection signal. By using this table, it is possible to reduce the amount of calculation processing compared to the correction method using a function.
- the characteristic of the flow rate signal is converted, so that the local curve is obtained without increasing the number of data in the table and without making the intervals unequal (that is, at equal intervals). Can be corrected with high accuracy, so that the accuracy of flow rate measurement can be improved.
- the gas can also be adapted to a structure in which the gas passes through the gas flow rate detecting element 4 along the sub passage 7 and exits from the sub passage outlet 29.
- a sub-passage such as a U-shape as shown in FIG. 11 or an ⁇ -shape as shown in FIG.
- the present invention can also be applied to the case of detecting the flow rate of gases other than air.
- a substrate temperature signal is used instead of using the gas temperature signal of the first embodiment.
- the temperature dependent error is corrected using the gas temperature signal Ta.
- the gas temperature detecting element 1 is provided on the upstream side of the air flow rate measuring device 2 so as to be directly exposed to the intake fluid in order to detect the gas temperature.
- the integrated circuit 21 is provided with a temperature sensor 12 in the integrated circuit for detecting the substrate temperature for detecting the temperature corresponding to the substrate 5, and temperature dependent error correction is performed based on the temperature signal Tl. I do.
- the temperature signal used for correcting the temperature-dependent error is the temperature signal Ta from the gas temperature detecting element 1 or the temperature signal Tl from the temperature sensor in the integrated circuit for detecting the substrate temperature is used as the PROM 15 Can be switched according to information set in advance.
- the temperature signal Tl from the temperature sensor in the integrated circuit there is no terminal supporting the gas temperature detecting element, and there is no disconnection.
- the temperature sensor in the integrated circuit is not directly exposed to the intake fluid, it is not polluted like the gas temperature detecting element. Therefore, since it is not affected by the change of the resistance value due to the contamination, the endurance change of the temperature characteristic can be reduced and the accuracy is improved.
- coordinate conversion is not a table but an Nth order function.
- the gas flow rate detection signal Q is converted to Q1 by the first coordinate conversion.
- This coordinate conversion is performed by an Nth order function.
- the gas temperature signal T is converted to T1 by the second coordinate conversion.
- This coordinate conversion is also performed using an Nth order function.
- FIG. 15 there are several combinations of table and N-order function conversions in the first coordinate conversion and the second coordinate conversion. Both the first coordinate conversion and the second coordinate conversion are converted by a table, the first coordinate conversion is a table, the second coordinate conversion is an N-order function, the first coordinate conversion is an N-order function, and the second coordinate conversion is a table conversion.
- both the first coordinate conversion and the second coordinate conversion can be corrected by conversion using an N-order function.
- the correction table can also be corrected by an N-order function, it is difficult for the correction table to cope with the characteristic curve of the gas flow rate detection signal by the function, and the resolution of the characteristic curve portion is reduced by the table.
- the first and second coordinate transformations are transformations for reducing the nonlinearity of the gas flow rate signal and the gas temperature signal, respectively, and are transformations for improving the resolution of the characteristic curve portion in the correction table.
- N-order function can be used.
- the first coordinate transformation is a table and the second coordinate transformation is an N-order function, the accuracy can be improved as in the first embodiment.
- the first and second coordinate conversion tables may be an equally spaced table having an arbitrary number of divisions.
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Abstract
Description
また、気体温度検出回路22は、吸気流路に配置した気体温度検出素子1と固定抵抗9を直列接続して構成されており、気体温度検出回路22にはレギュレータ23出力の定電圧が供給される。
このように、本実施例では、気体流量をQ、補正後の目標とする気体流量検出信号の出力特性と前記抵抗体の気体流量信号の出力をゼロスパンした値をΔYとし、前記特性曲がりの探索領域(範囲)の最小値をa、前記特性曲がりの探索領域の最大値をb、aとbの間の分割数をnとし、aとbの間で分割した区間ごとのΔYとQの勾配の和を分割数で割った値とaとbの間で最もΔYが大きかったときの値をΔYmax、あるいは、aとbの間で最もΔYが小さかったときの値ΔYmaxの積をSとしたとき、a及びbにより特性曲がりの場所を探索し、Sの大きさによって特性曲がりの大きさを判断し、Sの絶対値|S|の値が0.005以上のとき、a及びb及びSの値に応じて前記気体流量検出信号を|S|の値が0.055以下となるように補正する。
2 空気流量測定装置
3 ボディ
4 気体流量検出素子
5 基板
6 主通路
7 副通路
8 空気の流れ
9 固定抵抗
10 デジタル信号処理DSP
11 アナログ-デジタル変換器AD1
12 集積回路内の温度センサ
13 アナログ-デジタル変換器AD2
14 アナログ-デジタル変換器AD3
15 PROM
16 デジタル-アナログ変換器DA1
17 フリーランニングカウンタFRC1
18 デジタル-アナログ変換器DA2
19 フリーランニングカウンタFRC2
20 発振器
21 集積回路
22 気体温度検出回路
23 レギュレータ
24 マルチプレクサMUX1
25 マルチプレクサMUX2
26 エンジンコントロールユニットECU
27 副通路入り口
28 副通路出口
Claims (8)
- 気体流路中に配置される一又は複数の抵抗体に流れる電流又はこの電流に応じて発生する電圧を検出することにより前記気体流路中に流れる気体流量に応じた気体流量検出信号を出力する気体流量検出回路と、前記気体流路中の気体温度を検出するための気体温度検出素子あるいは集積回路内部に設けた基板温度を検出するための基板温度検出素子と、を有し、前記気体温度検出素子あるいは前記基板温度検出素子から得られる温度検出信号を基に前記気体流量検出信号の特性補正を行う気体流量測定装置において、
前記気体流量検出信号の目標特性からある一定量以上外れた特性曲がりを補正する信号変換手段を備えることを特徴とする気体流量測定装置。 - 請求項1に記載の気体流量測定装置において、
前記信号変換手段は、
気体流量をQ、補正後の目標とする気体流量検出信号の出力特性と前記抵抗体の気体流量信号の出力をゼロスパンした値をΔYとし、
前記特性曲がりの探索領域の最小値をa、前記特性曲がりの探索領域の最大値をb、aとbの間の分割数をnとし、
aとbの間で分割した区間ごとのΔYとQの勾配の和を分割数で割った値とaとbの間で最もΔYが大きかったときの値をΔYmax、あるいは、aとbの間で最もΔYが小さかったときの値ΔYmaxの積をSとしたとき、
前記a及びbにより前記特性曲がりの場所を探索し、前記Sの大きさによって特性曲がりの大きさを判断し、前記Sの絶対値|S|の値が0.005以上のとき、前記a及びb及びSの値に応じて前記気体流量検出信号を|S|の値が0.055以下となるように補正する信号変換手段であることを特徴とする気体流量測定装置。 - 請求項2に記載の気体流量測定装置において、
前記信号変換手段は、
前記気体流量検出信号の非線形性を緩和するための第1座標変換テーブルと、
前記温度検出信号の非線形性を緩和するための第2座標変換テーブルと有し、
前記座標変換された信号を元に補正行う補正テーブルを有する気体流量測定装置。 - 請求項3に記載の気体流量測定装置において、
前記第1及び第2座標変換テーブルは、任意の分割数の等間隔テーブルであることを特徴とする気体流量測定装置。 - 請求項2に記載の気体流量測定装置において、
前記気体流量測定装置は前記気体流量検出回路からの出力と前記気体温度検出素子からの出力信号をデジタル信号に変換し、それぞれの信号を補正した出力信号をアナログ信号に変換し出力する集積回路を備えることを特徴とする気体流量測定装置。 - 請求項3に記載の気体流量測定装置において、
前記補正テーブルに用いる気体温度検出信号は、前記気体温度検出素子からの気体温度信号であることを特徴とする気体流量測定装置。 - 請求項3に記載の気体流量測定装置において、
前記補正テーブルに用いる気体温度検出信号は、前記集積回路内に備えられた基板温度センサからの温度信号であることを特徴とする気体流量測定装置。 - 請求項2に記載の気体流量測定装置において、
デジタル信号に変換された前記気体温度検出信号および前記集積回路内に備えられた基板温度センサからの基板温度検出信号および前記気体流量検出回路からの気体流量検出信号が入力され、入力されたデジタル信号に基づいて補正演算処理を行うことを特徴とする気体流量測定装置。
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US14/240,917 US9297677B2 (en) | 2011-09-30 | 2012-08-16 | Gas flow rate measuring apparatus for minimizing temperature dependent errors |
DE112012004068.6T DE112012004068B4 (de) | 2011-09-30 | 2012-08-16 | Gasdurchflussmengen-Messvorrichtung |
CN201280040110.XA CN103748439B (zh) | 2011-09-30 | 2012-08-16 | 气体流量测定装置 |
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DE102013215921A1 (de) * | 2013-08-12 | 2015-03-05 | Continental Automotive Gmbh | Luftmassenmesser |
JP6142840B2 (ja) * | 2014-04-28 | 2017-06-07 | 株式会社デンソー | 空気流量測定装置 |
JP6434238B2 (ja) * | 2014-07-08 | 2018-12-05 | アズビル株式会社 | 流量計および補正値算出方法 |
EP3203195B1 (en) * | 2014-09-30 | 2021-12-08 | Hitachi Astemo, Ltd. | Thermal flow meter |
JP6354538B2 (ja) * | 2014-11-21 | 2018-07-11 | 株式会社デンソー | 通信システム、流量測定装置および制御装置 |
JP5933782B1 (ja) * | 2015-03-16 | 2016-06-15 | 三菱電機株式会社 | 流量測定装置に一体に設けられた物理量測定装置および物理量測定方法 |
JP6694523B2 (ja) * | 2016-12-20 | 2020-05-13 | 日立オートモティブシステムズ株式会社 | 気体流量測定装置 |
WO2020110820A1 (ja) * | 2018-11-30 | 2020-06-04 | 日立オートモティブシステムズ株式会社 | 物理量測定装置 |
JP7289742B2 (ja) * | 2019-07-02 | 2023-06-12 | 株式会社堀場エステック | 流量センサの補正装置、流量測定システム、流量制御装置、補正装置用プログラム、及び、補正方法 |
US11689326B2 (en) * | 2020-07-29 | 2023-06-27 | Infineon Technologies Ag | Diverse sensor measurement with analog output |
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JPH10197309A (ja) * | 1997-01-16 | 1998-07-31 | Hitachi Ltd | 熱式空気流量計用の測定素子及び熱式空気流量計 |
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DE112012004068T5 (de) | 2014-07-10 |
JP2013076601A (ja) | 2013-04-25 |
CN103748439B (zh) | 2016-01-06 |
DE112012004068B4 (de) | 2021-01-21 |
JP5663447B2 (ja) | 2015-02-04 |
CN103748439A (zh) | 2014-04-23 |
US20140190270A1 (en) | 2014-07-10 |
US9297677B2 (en) | 2016-03-29 |
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