Patent application number | Description | Published |
20080307867 | AIR FLOW MEASURING DEVICE - An air flow measuring device has a throttle portion provided in a first sub-passage, a second sub-passage branched from the first sub-passage at an upstream side of the throttle portion, and a flow amount sensor located in the second sub-passage. The second sub-passage is configured to introduce therein a part of air flowing in the first sub-passage, and an inlet of the second sub-passage is open into the first sub-passage at one side in a first radial direction perpendicular to a flow direction of air flowing in the first sub-passage. Furthermore, the throttle portion is provided to gradually reduce a passage dimension of the first sub-passage in a second radial direction, as toward an outlet of the first sub-passage. Here, the second radial direction is perpendicular to a surface defined by the first radial direction and the flow direction of air in the first sub-passage. | 12-18-2008 |
20080307868 | AIR FLOW MEASURING DEVICE - An air flow measuring device includes a first sub-passage portion configured to introduce therein a part of air flowing in an interior of a duct, a passage-area reducing portion provided in the first sub-passage portion to gradually reduce a passage sectional area of the first sub-passage portion as toward an outlet of the first sub-passage portion, and a second sub-passage portion branched from the first sub-passage portion at an upstream side of the passage-area reducing portion in a flow direction of air flowing in the first sub-passage portion. The second sub-passage portion is configured to introduce therein a part of air flowing in the first sub-passage portion. Furthermore, a flow amount sensor is located at an inlet of the second sub-passage portion, at which the second sub-passage portion is branched from the first sub-passage portion, to measure a flow amount of air flowing in the second sub-passage portion. | 12-18-2008 |
20100095753 | Air flow measuring device - An air flow measuring device has a throttle portion provided in a first sub-passage, a second sub-passage branched from the first sub-passage at an upstream side of the throttle portion, and a flow amount sensor located in the second sub-passage. The second sub-passage is configured to introduce therein a part of air flowing in the first sub-passage, and an inlet of the second sub-passage is open into the first sub-passage at one side in a first radial direction perpendicular to a flow direction of air flowing in the first sub-passage. Furthermore, the throttle portion is provided to gradually reduce a passage dimension of the first sub-passage in a second radial direction, as toward an outlet of the first sub-passage. Here, the second radial direction is perpendicular to a surface defined by the first radial direction and the flow direction of air in the first sub-passage. | 04-22-2010 |
20120103086 | FLOW MEASURING DEVICE - A flow measuring device includes a housing, a support, and a flow measurement element. The housing defines a passage therein and includes a passage narrowing part, which reduces a cross-sectional area of the passage, in a predetermined part of the passage. The support has a platy shape and is disposed along a flow direction of fluid flowing in the passage. The flow measurement element is located inside the passage narrowing part and is disposed on a surface of the support. The flow measurement element detects a flow rate of fluid flowing in the passage. The passage narrowing part has an inner wall surface that gradually reduces a width of the passage from a center side to both end sides of the passage in a height direction of the passage, which is perpendicular to a direction of the width of the passage. | 05-03-2012 |
20120291519 | METHOD FOR ADJUSTING FLOW MEASURING DEVICE - 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. | 11-22-2012 |
20120291533 | FLOW-RATE MEASURING APPARATUS - A converting map for an area of a backward air-flow is set based on a relationship between an output and a flow-rate, which are obtained in an air flow in which pulsation including the backward air-flow is generated. The backward air-flow has a dynamic property. The converting map of the present disclosure has a conversion characteristic, which is close to a characteristic in the backward air-flow. Accordingly, it is not necessary to correct the converting map by complicated processes and thereby accuracy of measurement for the area of the backward air-flow is increased. | 11-22-2012 |
20130014572 | AIRFLOW MEASURING DEVICEAANM Kitahara; NoboruAACI Kariya-cityAACO JPAAGP Kitahara; Noboru Kariya-city JP - An airflow measuring device has a bypass passage accommodating a thermal-type sensor configured to conduct heat transfer with air. A mainstream of intake air partially flows through the bypass passage and flows out of an outlet, as an after-bypass-passage flow. The mainstream partially flows along the outer surface of the airflow measuring device, without passing through the bypass passage, as an outside-passage flow. The outer surface of the airflow measuring device defines a throttle at the downstream of the outlet. The throttle merges the after-bypass-passage flow with the outside-passage flow and guides the merged flow to the downstream. | 01-17-2013 |
20130014573 | AIR FLOW MEASURING DEVICEAANM KAMIYA; ShinichiAACI Kariya-cityAACO JPAAGP KAMIYA; Shinichi Kariya-city JPAANM Kitahara; NoboruAACI Kariya-cityAACO JPAAGP Kitahara; Noboru Kariya-city JP - An air flow measuring device takes in part of intake air flowing through an intake passage. The device includes a housing and a sensor. The housing defines a bypass flow passage through which taken-in intake air passes and which has an outlet that opens on an outer wall of the housing. The sensor is accommodated in the bypass passage to produce an electrical signal as a result of heat transfer between taken-in intake air and the sensor. The outlet of the bypass passage includes vertical and non-vertical openings. The vertical opening opens toward a downstream side of a flow of intake air in the intake passage and is provided perpendicular to the flow of intake air. The non-vertical opening is provided non-perpendicularly to the flow of intake air in the intake passage. The outlet is a continuous stretch of opening where the vertical and non-vertical openings are continuously formed. | 01-17-2013 |
20130019675 | FLOW MEASURING DEVICE - A bypass passage receives a part of air flowing through a duct. A sub-bypass passage is branched from an intermediate portion of the bypass passage to separate dust contained in air flowing through the duct. A flow rate sensor is located in the sub-bypass passage for detecting the flow rate of air. A first wall surface and a second wall surface of the bypass passage are located upstream from the branch. The first wall surface is located on the side of the branch. The second wall surface is opposed to the first wall surface. Both the first wall surface and the second wall surface are curved to direct airflow to move away from the branch. | 01-24-2013 |
20130055800 | AIR FLOW MEASURING DEVICE - An air flow measuring device includes a housing, a sensor, and a throttle that is provided on an outer wall surface of the housing. The throttle merges together a bypass-passing flow and an outside-passing flow, and guides the merged flow toward the downstream side with the merged flow narrowed. The throttle includes two raised portions and a cover that bridges between the two raised portions and is opposed to the outer wall surface of the housing. The cover includes an inner surface exposed to the throttle, and an outer surface exposed to outside of the throttle. A peripheral border of the cover includes an upstream edge which defines the outer surface on the upstream side. At least a region of the outer surface including the upstream edge is swollen more outwardly in a shape of a projecting curved surface further on the downstream side. | 03-07-2013 |
20140083179 | FLOW DETECTION DEVICE - A plate-like flow sensor is located in a bypass passage such that a front-to-rear direction of the flow sensor is substantially along a width direction of the bypass passage. The flow sensor divides a flow from its upstream into a first flow, which passes on its front side, and a second flow, which passes on its rear side. The bypass passage has a bent portion in which the first flow and the second flow merge on a downstream side of the flow sensor. A flow deflection unit changes a turning quantity of at least one of the first flow and the second flow such that a turning quantity of the first flow and a turning quantity of the second flow are substantially conformed in the bent portion. | 03-27-2014 |