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81. 发明专利

JPH10148555A THERMAL AIR FLOWMETER 失效
公开(公告)号：JPH10148555A
公开(公告)日：1998-06-02
申请号：JP30773096
申请日：1996-11-19
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： ARAI NOBUKATSU , UCHIYAMA KAORU , WATANABE IZUMI
IPC分类号： G01F1/68 , F02D45/00 , G01F1/698 , G01F15/04
摘要： PROBLEM TO BE SOLVED: To obtain a thermal air flowmeter, in which the deviation between the intake temperature of a forward-flow-side heating resistor and the intake temperature of a backward-flow-side heating resistor is reduced and by which a backward flow is detected and corrected with high accuracy, by differentiating values of fixed resistances contained in temperature- compensation bridge circuits from each other so that the change in a backward-flow-side heating temperature is made larger than the change in a forward-flow side heating temperature to the change in an intake air temperature. SOLUTION: A forward-flow-side resistance film 3 and a backward-flow-side resistance film 23 are electrically heated respectively by two bridge circuits which are operated independently by heating-resistance films and temperature-compensation resistance films in such a way that the difference between their temperature and an air temperature becomes a nearly constant value irrespective of an air flow velocity. A voltage is supplied to the two bridge circuits from a power supply 50. A forward-flow side is composed of the heating-resistance film, of the temperature-compensation resistance film and of fixed resistances R8f, R7f, R1f, and it outputs a bridge voltage V2f to a circuit 60. A backward-flow side is composed of the heating-resistance film 23, of the temperature compensation film 4 and of fixed resistances R8r, R7r, R1r, and it outputs a bridge voltage V2r to the circuit 60. Values of the fixed resistances are set in such a way that R1f=R1r and that R8r=0.997 to 0.97 R8f.

82. 发明专利

JPH09236464A HEATING RESISTANCE-TYPE MEASURING APPARATUS FOR FLOW RATE OF AIR 失效
公开(公告)号：JPH09236464A
公开(公告)日：1997-09-09
申请号：JP4242896
申请日：1996-02-29
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： KOBAYASHI CHIHIRO , AKAMATSU MASUO , IGARASHI SHINYA , WATANABE IZUMI , UCHIYAMA KAORU , ISONO TADASHI
IPC分类号： G01F1/68 , F02D35/00 , G01F1/684 , G01F1/688 , G01F1/69 , G01F1/696 , G01F1/698
摘要： PROBLEM TO BE SOLVED: To obtain a heating resistance-type measuring apparatus whose measuring accuracy is enhanced in a pulsating flow which is accompanied by a backward flow when the apparatus is mounted on, and attached to, an actual vehicle by a method wherein two heating resistors are arranged in positions which interfere thermally with the flow of the air and the difference between an output signal from the resistor on one side and an output signal from the resistor on the other side is corrected to an output signal obtained from a resistor as a reference when the backward flow is generated. SOLUTION: A flow to the side of an engine from the side of an air cleaner out of the flow of the air flowing inside an intake air duct 18 is an air flow 4 in the forward direction, and its reverse is an air flow 5 in the reverse direction. Two resistors 2a, 2b are arranged inside the duct 18 so as to be driven by an independent drive circuit. The drive circuit controls a heating current so as to flow to the resistors 2a, 2b in such a way that a constant temperature difference is kept with reference to thermosensitive resistors 3a, 3b. The resistors 2a, 2b are arranged in positions which interfere thermally. In a forward flow, output characteristics of the resistors 2a, 2b are adjusted so as to become an identical output, and they are not corrected. The output value of the resistor 2a for a forward flow is output as it is. In a backward flow, an output in the backward flow is corrected by the difference in an output in such a way that the output of the resistor 2b for the backward flow becomes high.

83. 发明专利

JPH09229735A HEAT-GENERATING RESISTOR TYPE APPARATUS FOR MEASURING FLOW RATE OF AIR 失效
公开(公告)号：JPH09229735A
公开(公告)日：1997-09-05
申请号：JP3458996
申请日：1996-02-22
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： WATANABE IZUMI , ISONO TADASHI , KOBAYASHI CHIHIRO
IPC分类号： G01F1/68 , G01F1/692
摘要： PROBLEM TO BE SOLVED: To improve the responsivety, measuring accuracy and mechanical strength, by setting a non-heat-generating band of a width corresponding to the thickness of an electrically insulating substrate between a pair of heat- generating resistor element arranged on the substrate parallel to a flow direction. SOLUTION: A non-heat-generating band of a width 5 equal to or twice a thickness 6 of a ceramic substrate 4 of alumina or the like is formed between an upstream heat-generating resistor element 2 and a downstream heat- generating resistor element 3 arranged on the substrate 4 close to the upstream and downstream of a flow to a flowing direction of a fluid. When the ratio of the band width 5 to the thickness 6 is not larger than 1, output noises are large. On the contrary, as the width 5 becomes larger, responsivity is worsened. Therefore, the width 5 of the non-heat generating band is set in a ratio range of 1-2 where noises are not large and the responsivity is not greatly changed. In this manner, a substrate structure with superior mechanical strength, measuring accuracy and responsivity is obtained.

84. 发明专利

JPH0875519A AIR FLOWMETER 失效
公开(公告)号：JPH0875519A
公开(公告)日：1996-03-22
申请号：JP21342694
申请日：1994-09-07
申请人： HITACHI LTD , HITACHI CAR ENGINEERING KK
发明人： NISHIMURA YUTAKA , WATANABE IZUMI
IPC分类号： G01P5/12 , G01F1/68 , G01F1/692 , G01F1/698
摘要： PURPOSE: To measure an average air flow rate accurately even for a pulsating air flow accompanying a reverse flow by determining the average air flow based on the direction of air flow determined by the magnitude of signal delivered from two heating elements and the air flow rate determined by a signal delivered from a heating element having higher heat dissipation. CONSTITUTION: The potential (flow rate signal) at the lower end of a downstream side heating element 3 having smaller area is lower than that of an upstream side heating element 2 having larger area. A differential amplifier 27 regulates the amplitude of potential such that both potentials are equalized when the air flow rate is zero. When the potentials are compared by means of a comparator 28, a signal from the element 2 is higher than that from the element 3 and a flow direction signal is obtained. An analog switch 31 is operated by the signal to regulate the characteristics of potential (output signal) at the lower end of the element 2, through differential amplifiers 29, 30, such that the potential increases with the forward air flow rate but decreases with the reverse air flow rate. The signal is inputted to an engine control circuit 100 where an average air flow is determined.

85. 发明专利

JPH0814976A AIR FLOW RATE MEASURING INSTRUMENT 失效
公开(公告)号：JPH0814976A
公开(公告)日：1996-01-19
申请号：JP12348194
申请日：1994-06-06
申请人： HITACHI LTD , HITACHI CAR ENGINEERING KK
发明人： YOKOTA YOSHIHIRO , WATANABE IZUMI
IPC分类号： G01F1/68 , G01F1/69
摘要： PURPOSE:To provide an air flow rate measuring instrument which can be easily manufactured at a low cost and can detect the flow rate of air with high accuracy by providing an intermediate temperature sensitive resistor between an exothermic resistor and temperature sensitive resistor and setting the normal operating temperature of the intermediate temperature sensitive resistor higher than that of the temperature sensitive resistor. CONSTITUTION:The flow rate of air is measured with a circuit module 9 in which an exothermic resistor 1 and temperature sensitive resistor 2 are set in a by-pass and an intermediate temperature sensitive resistor 3 is provided between the resistors 1 and 2. The temperature of the resistor 1 is set at 200 deg.C and the normal operating temperature of the resistor 2 is set at 30 deg.C. When the normal operating temperature of the resistor 3 is set higher than that of the resistor 2, for example, at 50 deg.C, the response time and warming-up time of the instrument at the rising time can be remarkably improved. The best characteristic of the instrument can be found by combining the resistance values of the resistors 2 and 3, because the resistance value of the resistors 2 and 3 can be changed by, for example, 100-1,000kOMEGA when the temperatures of the resistors 2 and 3 are changed by 2-30 deg.C.

86. 发明专利

JP2006258455A Physical quantity sensor 有权
标题翻译：物理量传感器
公开(公告)号：JP2006258455A
公开(公告)日：2006-09-28
申请号：JP2005072818
申请日：2005-03-15
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： NAKANO HIROSHI , MATSUMOTO MASAHIRO , YAMADA MASAMICHI , NAKADA KEIICHI , WATANABE IZUMI
IPC分类号： G01F1/692 , G01F1/698 , G01P15/12
CPC分类号： G01C9/00 , G01F1/6845 , G01F1/69 , G01P15/008
摘要： PROBLEM TO BE SOLVED: To provide a highly precise physical quantity sensor by reducing the resistance fluctuation caused by the stress as well as ensuring the reliability in strength. SOLUTION: When the parallel direction to the predetermined directional (e.g. max. stress application direction) stress σ, is defined as a lateral direction, and the perpendicular direction to that is defined as a longitudinal direction, the resistance bodies 7a, 7b, 8a and 8b are composed of the lateral directional resistance component Rl and the longitudinal directional resistance component Rt. When the ratio of piezo resistance coefficient πl which is the value when the stress σ of the substrate is added to the lateral resistance component Rl to the piezo resistance coefficient πt which is the value when the stress σ is added to the longitudinal resistance component Rt is πl:πt=-n:1 (n is integer), the resistance ratio of the longitudinal resistance component Rt to the lateral resistance component Rl is made to set approximately equal to the ratio of piezo resistance coefficients πl to πt. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：通过减少由应力引起的电阻波动以及确保强度的可靠性来提供高精度物理量传感器。解决方案：当将与预定方向（例如最大应力施加方向）应力σ的平行方向定义为横向方向时，将垂直方向定义为纵向方向时，电阻体7a，7b ，8a和8b由横向阻力分量R1和纵向阻力分量Rt构成。当将作为基板的应力σ与横向电阻分量R1相加的压电阻抗系数πl与作为将应力σ加到纵向电阻分量Rt时的值的压电电阻系数πt的比率 πl：πt= -n：1（n为整数），将纵向电阻分量Rt与横向电阻分量R1的电阻比设定为近似等于压电电阻系数πl与πt之比。版权所有（C）2006，JPO＆NCIPI

87. 发明专利

JP2006162631A Thermal flow measurement device 有权
标题翻译：热流量测量装置
公开(公告)号：JP2006162631A
公开(公告)日：2006-06-22
申请号：JP2006002535
申请日：2006-01-10
申请人： Hitachi Car Eng Co Ltd , Hitachi Ltd , 株式会社日立カーエンジニアリング , 株式会社日立製作所
发明人： WATANABE IZUMI , HORIE JUNICHI , NAKADA KEIICHI , KAMIYAMA KEI
IPC分类号： G01F1/684 , F02D35/00
摘要： PROBLEM TO BE SOLVED: To provide a thermal flow measurement device with high reliability capable of preventing a liquid such as a water droplet from sticking to a sensor element for detecting the flow rate. SOLUTION: A plurality of grooves 2 are formed on the inner wall of a sub channel 6 so as to be inclined at an angle of about 45 degree to the flow 10 of fluid and headed in the direction in which a large centrifugal force is generated in the sub channel 6. If the water droplet 21 sticks to the inner wall of the sub channel 6, the water droplet 21 comes into contact with the plurality of grooves 2 and is captured in the plurality of grooves 2 by the surface tension. Then, the water droplet 21 is moved along the groove 2 and onto the side wall on the side where a large centrifugal force is generated by the flow 10 of fluid in the sub channel 6. The water droplet 21 being moved to the side wall is directed toward an outlet aperture 8 while being applied with the centrifugal force so as not to be separated from the side wall. Therefore, the water droplet 21 does not stick to the sensor element 4 for flow measurement, and the thermal flow measurement device with high reliability can be achieved. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供一种具有高可靠性的热流测量装置，其能够防止诸如水滴的液体粘附到用于检测流量的传感器元件。解决方案：在子通道6的内壁上形成有多个槽2，以与流体的流动10成大约45度的角度倾斜，并沿着大的离心力在子通道6中产生。如果水滴21粘附到子通道6的内壁，则水滴21与多个槽2接触并且通过表面张力被捕获在多个槽2中。然后，水滴21沿着沟槽2移动到通过副通道6中的流体的流动10产生大的离心力的一侧的侧壁上。移动到侧壁的水滴21是指向出口孔8，同时施加离心力，以便不与侧壁分离。因此，水滴21不粘附到用于流量测量的传感器元件4，并且可以实现具有高可靠性的热流量测量装置。版权所有（C）2006，JPO＆NCIPI

88. 发明专利

JP2006064710A Thermal flow measuring device 有权
标题翻译：热流量测量装置
公开(公告)号：JP2006064710A
公开(公告)日：2006-03-09
申请号：JP2005336181
申请日：2005-11-21
申请人： Hitachi Car Eng Co Ltd , Hitachi Ltd , 株式会社日立カーエンジニアリング , 株式会社日立製作所
发明人： WATANABE IZUMI , HORIE JUNICHI , NAKADA KEIICHI , KAMIYAMA KEI , YAMADA MASAMICHI
IPC分类号： G01F1/698 , G01F1/68 , G01F1/684 , G01F1/692
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive and reliable thermal flow measuring device capable of precisely detecting the flow even under a thermally severe environment such as engine room. SOLUTION: All resistances constituting a constant temperature difference control are formed of temperature-sensitive bodies of the same material in the same substrate. Thus, the resistances for the constant temperature difference control are exposed to the same environmental condition. Therefore, even if change over time occurs, substantially similar change over time occurs. When the resistances for the constant temperature difference control change over time at the same ratio, the output error becomes very small. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供一种便宜且可靠的热流测量装置，即使在诸如发动机室的严酷环境下也能够精确地检测流量。解决方案：构成恒温差控制的所有电阻由同一基板中相同材料的温度敏感体形成。因此，恒温差控制的电阻暴露在相同的环境条件下。因此，即使随时间发生变化，也会发生与时间基本相似的变化。当恒温差控制的电阻以相同的比例随时间变化时，输出误差变得非常小。版权所有（C）2006，JPO＆NCIPI

89. 发明专利

JP2005128038A Air flow rate measuring device 有权
标题翻译：空气流量测量装置
公开(公告)号：JP2005128038A
公开(公告)日：2005-05-19
申请号：JP2005035366
申请日：2005-02-14
申请人： Hitachi Car Eng Co Ltd , Hitachi Ltd , 株式会社日立カーエンジニアリング , 株式会社日立製作所
发明人： ONIKAWA HIROSHI , WATANABE IZUMI , IGARASHI SHINYA , NAKADA KEIICHI , KAMIYAMA KEI
IPC分类号： G01F1/00 , G01F1/684
摘要： PROBLEM TO BE SOLVED: To provide a heat element type air flow rate measuring device reducing dirt, deterioration along with the time, and breakage of a flow rate measuring element due to dust and droplets in intake air. SOLUTION: In this air flow rate measuring device, the flow passage shape of an auxiliary passage, in which the air flow rate measuring element is installed, is defined. Without using any new production method or the like, the heat element type air flow rate measuring device can be provided at a low cost. COPYRIGHT: (C)2005,JPO&NCIPI

90. 发明专利

JP2003337056A Heating resistor type air flowmeter 有权
标题翻译：加热电阻式空气流量计
公开(公告)号：JP2003337056A
公开(公告)日：2003-11-28
申请号：JP2002142495
申请日：2002-05-17
申请人： Hitachi Car Eng Co Ltd , Hitachi Ltd , 株式会社日立カーエンジニアリング , 株式会社日立製作所
发明人： MINAMITANI RINTARO , IGARASHI SHINYA , WATANABE IZUMI , YASUKAWA AKIO
IPC分类号： G01F1/68 , F02D35/00 , G01F1/698
摘要： PROBLEM TO BE SOLVED: To solve the problems that salt deposits and sticks to a heating resistor concentratedly, when rain or snow containing sea salt in a seaside region or thaw salt in a cold district is taken in, the deposition and sticking of the salt to the heating resistor becomes possible causes of deterioration of the measurement precision of an air flow measuring apparatus and corrosion of the heating resistor, and salt deposits and sticking to the heating resistor concentratedly also in the conventional adhesion preventing coating. SOLUTION: The temperature of the heating resistor is set to a temperature value or higher at which a water drop having touched its surface evaporates and disappears by film boiling. Besides, it does not matter if the temperature of the heating resistor is set to a temperature value or higher at which a liquid drop having touched its surface evaporates and disappears by film boiling, when a heating resistor type air flowmeter starts or stops its operation. Besides, a water-repellent and oil-repellent protective coating may be formed on the surface of the heating resistor. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了解决盐分沉积和粘附在加热电阻器上的问题，当在海边地区的海水中含有海盐或含冰盐或在冷区的解冻盐时，沉积和粘附对加热电阻器的盐成为空气流量测量装置的测量精度恶化和加热电阻器腐蚀的原因，并且在常规的防粘附涂层中也集中地沉积和粘附到加热电阻器上。解决方案：加热电阻器的温度设定为接触其表面的水滴蒸发并通过薄膜沸腾消失的温度值或更高。此外，当加热电阻型空气流量计开始或停止其操作时，加热电阻器的温度设定为接触其表面的液滴蒸发并通过薄膜沸腾消失的温度值或更高。此外，可以在加热电阻器的表面上形成防水和防油涂层。版权所有（C）2004，JPO

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