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21. 发明专利

JP2000304585A FLOW MEASUREMENT DEVICE 失效
公开(公告)号：JP2000304585A
公开(公告)日：2000-11-02
申请号：JP11594899
申请日：1999-04-23
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： KOMACHIYA MASAHIRO , SONOBE HISAO , ONIKAWA HIROSHI , WATANABE IZUMI
IPC分类号： G01F1/00 , F02D35/00 , G01F1/68 , G01F1/684 , G01F15/12 , G01P5/12
摘要： PROBLEM TO BE SOLVED: To effectively filter a pollutant by placing a change means for a flow direction functioning as inertia filter, which removes the pollutant disturbing measurement, at a flow control and then a flow detection part after the change means. SOLUTION: A change means for a flow direction comprises louvers 11 where vanes are spaced uniformly with an inclination of a definite angle, a guide 12 with an inclination of a definite angle to the louvers 11, and a removal outlet 13 removing the pollutant filtered by the guide 12. A part of air passed through an air cleaner 60, flows between the louvers 11 and guide 12. A flow of the air is changed a flow direction when passing through the louvers 11, and the pollutant in the fluid remains because the pollutant can not follow a change of the flow direction because of inertia thereof and is pushed away to the removal outlet 13. The pollutant is extracted out to an outside of the removal outlet 13 by differential pressure because of outside velocity faster than inside velocity, and then joins a main flow to be flowed to a down stream from a flow detection part 20. The flow detection part 20 is not exposed to the pollutant because a flow in the flow detection part 20 is a clean flow passed through the louvers 11.

22. 发明专利

JP2002054966A OPERATIONAL DEVICE BUILT-IN SENSOR 失效
公开(公告)号：JP2002054966A
公开(公告)日：2002-02-20
申请号：JP2000240684
申请日：2000-08-09
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： OTA KENJI , ONIKAWA HIROSHI , SAITO TAKAYUKI
IPC分类号： G01F1/698 , F02D35/00 , F02D45/00
摘要： PROBLEM TO BE SOLVED: To achieve an operational device built-in sensor capable of correcting deterioration with time and improving accuracy of sensor signal for a sensor having a numerical operation means and performing adjustment by digital data. SOLUTION: Action time of a sensor is measured by an action time measuring means and correction is carried out corresponding to the cumulative elapsing time. The correction is performed in a correction means 310 of the numerical operation means 300. Thus, since the sensor having a numerical operation means and performing adjustment by digital data is adapted to measure the elapsing time for usage of the sensor and perform correction operation for correcting deterioration of the sensor corresponding to the elapsing time, the operational device built-in sensor can be realized, capable of correcting deterioration with time and improving accuracy of sensor signal for the sensor having the numerical operation means and performing adjustment by digital data.

23. 发明专利

JP2003161652A FLOW RATE MEASURING DEVICE 审中-公开
公开(公告)号：JP2003161652A
公开(公告)日：2003-06-06
申请号：JP2001360220
申请日：2001-11-27
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： SAITO TAKAYUKI , ONIKAWA HIROSHI
IPC分类号： G01F1/68 , F02D35/00 , F02M69/32 , G01F1/684
摘要： PROBLEM TO BE SOLVED: To provide a flow rate measuring device capable of achieving high performance, high degree of reliability, and low cost in the environments where pollutants or water droplets come by air, and vibration is applied or the like. SOLUTION: An inlet of a bypass passage where a heat generating resistive element is provided is arranged with an angle. The flow rate measuring device itself is also arranged with an angle which is neither perpendicular to nor parallel to the flow direction of a fluid flowing through a main passage. As a result, water droplets or the like have difficulty in intruding the bypass, providing high-precision measurements of fluid flow rate. Breakdowns due to resonance or the like are also prevented. COPYRIGHT: (C)2003,JPO

24. 发明专利

JPH0440323A HOT-WIRE TYPE AIR FLOWMETER 失效
公开(公告)号：JPH0440323A
公开(公告)日：1992-02-10
申请号：JP14628290
申请日：1990-06-06
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： MIYAZAKI ATSUSHI , KOBAYASHI CHIHIRO , ONIKAWA HIROSHI
IPC分类号： G01F1/68 , G01F1/684
摘要： PURPOSE:To reduce an output noise by forming the minor axis side opening internal wall surface of a subordinate flow passage whose intake opening part is elliptic in parallel with the axial direction of the main flow passage and slanting the major axis side opening internal wall surface at an angle of

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