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1.发明公开公开(公告)号：US20240151566A1
公开(公告)日：2024-05-09
申请号：US18281796
申请日：2022-02-10
申请人： Hitachi Astemo, Ltd.
发明人： Ryosuke DOI , Masahiro MATSUMOTO
CPC分类号： G01F1/6965 , G01F1/72
摘要： The present disclosure provides a physical quantity detection device and a signal processing device capable of improving accuracy in detecting an air flow rate by a thermal flow sensor during pulsation of air including a reverse flow region. The signal processing device 200 includes a direction determination unit 210, an increase/decrease determination unit 220, a correction factor storage unit 230, a correction factor selection unit 240, and a signal correction unit 250. The direction determination unit 210 determines a forward flow or a reverse flow of the air based on a detection signal DS of the thermal flow sensor. The increase/decrease determination unit 220 determines an increase or decrease in flow rate of the air based on the detection signal DS. The correction factor storage unit 230 stores first to fourth factors used for correction of the detection signal DS. The correction factor selection unit 240 selects any one of the first to fourth factors as a correction factor CF based on determination results of the direction determination unit 210 and the increase/decrease determination unit 220. The signal correction unit 250 corrects the detection signal DS by using the correction factor CF. The correction factor selection unit 240 selects the first factor in a case of the forward flow of the air and the increase in flow rate, selects the second factor in a case of the reverse flow and the increase in flow rate, selects the third factor in a case of the forward flow and the decrease in flow rate, and selects the fourth factor in a case of the reverse flow and the decrease in flow rate.
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公开(公告)号：US11298103B2
公开(公告)日：2022-04-12
申请号：US16087442
申请日：2017-03-17
发明人： Peter David Weinberg
IPC分类号： A61B8/06 , A61B8/08 , G01F1/72 , G01P5/24 , G01F1/708 , A61B5/026 , G01F1/66 , A61B5/107 , A61B5/0285 , G01F1/7082 , G01F1/667
摘要： A method of determining a measure of wave speed or intensity in a fluid conduit uses ultrasound measurements to determine the conduit diameter and fluid velocity in a volume element, each as a function of time, and each at a same longitudinal position of the conduit. The ultrasound measurement to determine fluid velocity is effected by tracking objects within the fluid flow in successive frames sampling the volume element, and obtaining displacement vectors for the objects. A wave speed may be determined from a ratio of the change in fluid velocity at the longitudinal position as a function of time and the change in a logarithmic function of the conduit diameter as a function of time. A measure of wave intensity may be determined as a function of change in determined conduit diameter and corresponding change in fluid velocity.
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公开(公告)号：US11154794B2
公开(公告)日：2021-10-26
申请号：US15728390
申请日：2017-10-09
IPC分类号： B01D15/12 , B01D59/44 , G01F1/72 , G01N1/22 , G01N1/24 , G01N1/40 , G01N30/30 , G01N30/96 , G01N15/08 , G01N30/62 , G01N30/02 , G01N30/12
摘要： Certain configurations of devices and systems which are configured to draw a selected volume of an air sample into a trap are described. In some examples, the devices and systems comprise a pump and a mass flow sensor to draw a selected volume of the air sample through a trap even where variable restriction occurs.
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公开(公告)号：US11105667B2
公开(公告)日：2021-08-31
申请号：US16564495
申请日：2019-09-09
申请人： HORIBA, LTD.
发明人： Yoshinori Otsuki
摘要： The present invention accurately measures flow rates that have a high peak flow rate caused by pulsation, and is provided with a first flow rate converter having a first measurement range and a first response speed, a second flow rate converter having a second measurement range that is narrower on a low flow rate side than the first measurement range and has a second response speed that is slower than the first response speed, and a flow rate calculation unit that, when a flow rate contained in the second measurement range is measured, calculates the flow rate by correcting outputs from the first flow rate converter using outputs from the second flow rate converter.
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公开(公告)号：US20210108952A1
公开(公告)日：2021-04-15
申请号：US17132292
申请日：2020-12-23
申请人： DENSO CORPORATION
发明人： Noboru KITAHARA , Kengo ITO , Teruaki KAIFU , Amane HIGASHI
摘要： A measurement control device measures an air flow rate using an output value of a sensing portion that outputs a signal according to the air flow rate, and outputs the measurement result of the air flow rate to a predetermined external device. The measurement control device includes: a pulsation state calculator that calculates a pulsation state, which is a state of pulsation generated in the air flow rate, by using the output value of the sensing portion instead of acquiring an output value from an external device; and a flow rate correcting unit that corrects the air flow rate using the pulsation state calculated by the pulsation state calculator.
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公开(公告)号：US20210033441A1
公开(公告)日：2021-02-04
申请号：US17075909
申请日：2020-10-21
申请人： DENSO CORPORATION
发明人： Noboru KITAHARA
摘要： In a measurement control device that measures an airflow, an amplitude calculator calculates, by use of an output value of a sensor, a pulsation amplitude that is a difference between a pulsation maximum and an average airflow or a difference between the pulsation maximum and a pulsation minimum. The pulsation maximum is a maximum value of pulsation generated in the airflow, the average airflow is an average value of the pulsation, and the pulsation minimum is a minimum value of the pulsation. A correction parameter acquirer acquires a correction parameter corresponding to the calculated pulsation amplitude by use of a correction characteristic. An airflow corrector corrects the airflow by use of the acquired correction parameter.
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公开(公告)号：US20200340839A1
公开(公告)日：2020-10-29
申请号：US16926838
申请日：2020-07-13
申请人： DENSO CORPORATION
发明人： Junzo YAMAGUCHI , Noboru KlTAHARA
摘要： A processing unit processes a signal output from a sensor unit that outputs a signal corresponding to an intake air amount that is an amount of intake air flowing through an intake flow path of an internal combustion engine. The processing unit has an advance processing section and a smoothing processing section. The advance processing section performs an advance process on the signal output from the sensor unit to compensate for a response delay. The smoothing processing section performs a smoothing process on the signal processed by the advance processing section.
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公开(公告)号：US10816380B2
公开(公告)日：2020-10-27
申请号：US16614996
申请日：2018-03-29
摘要： An air flow meter capable of rapidly following a change of a pulsation state of an input signal includes: an air flow rate detection element that generates an input signal Qsen relating to an air flow rate to be measured; and a calculation unit that performs calculation to generate an output signal Qout in response to the input signal Qsen. The calculation unit includes: the output signal calculation unit that performs calculation including exponentiation of raising the power of the output signal Qout by more than one; the input signal calculation unit that performs calculation on the input signal Qsen; the subtractor that obtains the difference between the calculation results by the output signal calculation unit and the input signal calculation unit; and the integrator that integrates the difference obtained by the subtractor, and the output signal Qout is generated based on the output from the integrator.
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公开(公告)号：US10539446B2
公开(公告)日：2020-01-21
申请号：US13473967
申请日：2012-05-17
申请人： Noboru Kitahara
发明人： Noboru Kitahara
摘要： A method is for adjusting a flow measuring device that includes a housing and a flow sensor. The housing includes a bypass flow passage which is formed to take in a part of a mainstream of air. The sensor is disposed in the bypass flow passage and outputs an electrical signal in accordance with a flow rate of air. The bypass flow passage is formed in an asymmetrical shape with respect to the sensor in upstream and downstream directions of the mainstream. A flow from an upstream side toward a downstream side of the mainstream is a forward flow. A flow from the downstream side toward the upstream side of the mainstream is a backward flow. According to the method, an output from the sensor in a backward-flow region is obtained. Furthermore, the output of the sensor in the backward-flow region is adjusted to have a desired output characteristic.
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公开(公告)号：US20200003595A1
公开(公告)日：2020-01-02
申请号：US16469516
申请日：2017-12-21
发明人： Koji KISE , Takashi MORIYAMA
摘要： Provided is a flow rate measuring device including a connector portion, a main body portion, an internal flow passage, and a flow rate detection element. The internal flow passage includes a main flow passage and a sub-flow passage. The sub-flow passage includes a flow rate detection element-side flow passage and connection flow passages. The main flow passage includes an introduction portion, a small flow passage sectional area portion, and an exit portion. The connection flow passages include an upstream-side connection flow passage and a downstream-side connection flow passage. The main flow passage and the flow rate detection element-side flow passage are formed so as to be symmetric with respect to a plane having a flow direction of the fluid to be measured flowing through the pipe as a normal. The main flow passage has a portion at the plane of symmetry as the small flow passage sectional area portion.
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