JP2019132866A5 - - Google Patents
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- JP2019132866A5 JP2019132866A5 JP2019095368A JP2019095368A JP2019132866A5 JP 2019132866 A5 JP2019132866 A5 JP 2019132866A5 JP 2019095368 A JP2019095368 A JP 2019095368A JP 2019095368 A JP2019095368 A JP 2019095368A JP 2019132866 A5 JP2019132866 A5 JP 2019132866A5
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- pulsation
- air flow
- flow rate
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- 238000005259 measurement Methods 0.000 claims description 9
- 230000002596 correlated Effects 0.000 claims 7
- 238000002485 combustion reaction Methods 0.000 claims 4
Description
上記目的を達成するために本開示は、
空気が流れる環境に配置されるセンシング部（１０）の出力値に基づいて空気流量を測定する空気流量測定装置であって、
出力値から空気流量の平均値である平均空気量を所定の計測期間について算出する平均空気量演算部（３７）と、
出力値から空気流量の最大値である脈動最大値を計測期間について求める脈動最大値演算部（３６）と、
脈動最大値と平均空気量との差を取ることで空気流量の脈動振幅を演算する脈動振幅演算部（３６、３８）と、を備えていることを特徴とする。
In order to achieve the above object, the present disclosure provides
An air flow rate measuring device for measuring an air flow rate based on an output value of a sensing unit (10) arranged in an environment in which air flows,
An average air amount calculation unit (37) for calculating an average air amount, which is the average value of the air flow rate, from the output value for a predetermined measurement period ;
Pulsation maximum value calculator Ru determined for measurement period pulsation maximum value is the maximum value of the air flow rate from the output value (36),
Pulsation amplitude calculation unit for calculating the pulsation amplitude of the air flow rate by taking the difference between the pulsation maximum value and the average amount of air (36, 38), characterized in that it comprises.
Claims (12)
前記出力値から前記空気流量の平均値である平均空気量を所定の計測期間について算出する平均空気量演算部（３７）と、
前記出力値から前記空気流量の最大値である脈動最大値を前記計測期間について求める脈動最大値演算部（３６）と、
前記脈動最大値と前記平均空気量との差を取ることで前記空気流量の脈動振幅を演算する脈動振幅演算部（３８）と、を備えている空気流量測定装置。 An air flow rate measuring device for measuring an air flow rate based on an output value of a sensing unit (10) arranged in an environment in which air flows,
An average air amount calculation unit (37) that calculates an average air amount that is an average value of the air flow rate from the output value for a predetermined measurement period ;
Pulsation maximum value calculator Ru determined for the measurement period pulsation maximum value is the maximum value of the air flow rate from the output value (36),
The pulsation maximum value and the average amount of air and in that the air flow measuring device comprising pulsation amplitude calculating unit for calculating the pulsation amplitude of the air flow by taking the difference between (3 8), the.
前記脈動誤差予測部にて予測した前記脈動誤差を用いて、前記脈動誤差が小さくなるように前記空気流量を補正する脈動誤差補正部（４０）と、を備えている請求項１に記載の空気流量測定装置。The air according to claim 1, further comprising a pulsation error correction unit (40) that corrects the air flow rate so that the pulsation error is reduced by using the pulsation error predicted by the pulsation error prediction unit. Flow rate measuring device.
前記脈動誤差予測部（３９ａ）が、前記脈動振幅に相関した前記脈動誤差として、前記脈動率に相関した前記脈動誤差を予測する請求項２に記載の空気流量測定装置。 A pulsation rate calculation unit (38a) for calculating the pulsation rate of the air flow rate by dividing the pulsation amplitude by the average air amount,
The air flow rate measuring device according to claim 2 , wherein the pulsation error prediction unit (39a) predicts the pulsation error correlated with the pulsation rate as the pulsation error correlated with the pulsation amplitude.
前記脈動誤差予測部が、さらに、前記周波数取得部で取得した脈動周波数にも相関した前記脈動誤差を予測する請求項２乃至４のいずれか一項に記載の空気流量測定装置。 A frequency acquisition unit (42, 42a) for acquiring a pulsation frequency that is a frequency of a pulsation waveform in the air is provided,
The pulsation error prediction unit is further air flow rate measuring device according to any one of claims 2 to 4 for predicting the pulsation error was also correlated to the pulsation frequency acquired by the frequency acquisition part.
前記周波数取得部が、前記内燃機関制御装置からの前記信号を取得し、取得した前記信号に基づいて前記脈動周波数を取得する請求項５に記載の空気流量測定装置。 It is configured to be able to acquire a signal indicating the operating state of the internal combustion engine from the internal combustion engine control device that controls the internal combustion engine using the air flow rate corrected by the pulsation error correction unit,
The air flow rate measurement device according to claim 5 , wherein the frequency acquisition unit acquires the signal from the internal combustion engine control device and acquires the pulsation frequency based on the acquired signal.
前記平均空気量と前記脈動最大値を求める計測期間を、前記脈動周期演算部で演算した脈動周期に応じて変更する計測期間演算部（３４ｂ）と、を備え、
前記計測期間演算部は、前記脈動周期が長い場合、前記脈動周期が短い場合よりも前記計測期間を長くする請求項２乃至６のいずれか一項に記載の空気流量測定装置。 A pulsation cycle calculation unit (34a) for calculating the pulsation cycle of the air,
A measurement period calculation unit (34b) for changing the measurement period for obtaining the average air amount and the pulsation maximum value according to the pulsation cycle calculated by the pulsation cycle calculation unit,
The measurement period calculation unit is configured when the pulse period is long, the air flow measuring device according to any one of claims 2 to 6 wherein the pulse period is longer the measuring period than shorter.
前記ダクトのダクト径を記憶しているダクト径記憶部（４３）を備えており、
前記脈動誤差予測部が、さらに、前記ダクト径記憶部に記憶された前記ダクト径にも相関した前記脈動誤差を予測する請求項２乃至７のいずれか一項に記載の空気流量測定装置。 The sensing unit is mounted in a duct and measures the flow rate of the air flowing in the duct.
A duct diameter storage section (43) for storing the duct diameter of the duct is provided,
The air flow measuring device according to any one of claims 2 to 7 , wherein the pulsation error prediction unit further predicts the pulsation error that is also correlated with the duct diameter stored in the duct diameter storage unit.
複数の前記誤差予測式のそれぞれは、前記脈動振幅の変化に対する前記脈動誤差の変化の傾向が異なり、
前記脈動誤差予測部は、前記脈動振幅の大きさに応じて、前記誤差予測式を変更する請求項２乃至８のいずれか一項に記載の空気流量測定装置。 The pulsation error prediction unit uses a plurality of error prediction formulas to predict the pulsation error correlated with the pulsation amplitude,
Each of the plurality of error prediction formulas, the tendency of the change of the pulsation error with respect to the change of the pulsation amplitude is different,
The air flow measuring device according to any one of claims 2 to 8 , wherein the pulsation error prediction unit changes the error prediction formula according to the magnitude of the pulsation amplitude.
前記平均空気量演算部は、前記出力値としての前記処理後出力値から、前記平均空気量を算出し、
前記脈動振幅演算部は、前記出力値としての前記処理後出力値から、前記脈動最大値を求める請求項１乃至９のいずれか一項に記載の空気流量測定装置。 The output value is subjected to filter processing, and a filter processing unit for outputting the output value after processing is provided,
The average air amount calculation unit calculates the average air amount from the processed output value as the output value,
The pulse amplitude calculation unit, from the processed output value as the output value, air flow rate measuring apparatus according to any one of claims 1 to 9 obtains the pulsation maximum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019095368A JP6702484B2 (en) | 2019-05-21 | 2019-05-21 | Air flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019095368A JP6702484B2 (en) | 2019-05-21 | 2019-05-21 | Air flow measuring device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017080779A Division JP6531774B2 (en) | 2017-04-14 | 2017-04-14 | Air flow measuring device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2019132866A JP2019132866A (en) | 2019-08-08 |
| JP2019132866A5 true JP2019132866A5 (en) | 2020-04-23 |
| JP6702484B2 JP6702484B2 (en) | 2020-06-03 |
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Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3027834C2 (en) * | 1980-07-23 | 1982-11-04 | P.I.V. Antrieb Werner Reimers GmbH & Co KG, 6380 Bad Homburg | Plate chain for infinitely adjustable conical pulley gear |
| JPS5744815A (en) * | 1980-09-01 | 1982-03-13 | Hitachi Ltd | Measuring method of air flow rate |
| JPS581602A (en) * | 1981-06-20 | 1983-01-07 | ピジヨン株式会社 | Packer |
| DE3218931A1 (en) * | 1982-05-19 | 1983-11-24 | Bosch Gmbh Robert | METHOD FOR MEASURING THE PULSION OF AIR SUCTIONED BY AN INTERNAL COMBUSTION ENGINE |
| DE3304710A1 (en) * | 1983-02-11 | 1984-08-16 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD AND DEVICE FOR MEASURING THE AIR FLOW RATE IN THE INTAKE PIPE OF AN INTERNAL COMBUSTION ENGINE |
| DE3509118C2 (en) * | 1985-03-14 | 1994-03-24 | Bosch Gmbh Robert | Method and device for measuring the throughput of a medium flowing through a pipe |
| US4638770A (en) * | 1985-09-13 | 1987-01-27 | Duke Fox | Porting system for two cycle internal combustion engines |
| JP2861310B2 (en) * | 1990-07-13 | 1999-02-24 | 日産自動車株式会社 | Air flow meter |
| DE19933665A1 (en) * | 1999-07-17 | 2001-01-18 | Bosch Gmbh Robert | Device for detecting a pulsating variable |
| JP5851358B2 (en) * | 2012-07-12 | 2016-02-03 | 日立オートモティブシステムズ株式会社 | Control device for internal combustion engine |
| JP6106559B2 (en) * | 2013-09-02 | 2017-04-05 | 日立オートモティブシステムズ株式会社 | Thermal flow sensor |
| JP6464709B2 (en) * | 2014-12-09 | 2019-02-06 | 株式会社デンソー | Air flow meter |
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