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    Ultrasonic-wave propagation-time measuring method, gas-pressure measuring method, gas-flow rate measuring method, and gas sensor
    1.
    发明授权
    Ultrasonic-wave propagation-time measuring method, gas-pressure measuring method, gas-flow rate measuring method, and gas sensor 失效
    超声波传播时间测量方法，气压测量方法，气体流量测量方法和气体传感器

    公开(公告)号：US06568281B1

    公开(公告)日：2003-05-27

    申请号：US09635897

    申请日：2000-08-11

    申请人： Yoshikuni Sato ,  Keigo Banno ,  Hideki Ishikawa ,  Noboru Ishida ,  Takafumi Oshima

    发明人： Yoshikuni Sato ,  Keigo Banno ,  Hideki Ishikawa ,  Noboru Ishida ,  Takafumi Oshima

    IPC分类号： G01F166

    CPC分类号： G01F1/668 ,  G01H5/00 ,  G01L11/06 ,  G01N29/024 ,  G01N29/38 ,  G01N29/4454 ,  G01N29/48 ,  G01N2291/0212 ,  G01N2291/0217 ,  G01N2291/02809 ,  G01N2291/02836 ,  G01N2291/02872 ,  G01N2291/101 ,  G01N2291/102

    摘要： An ultrasonic-wave propagation time measuring method which enables determination of accurate propagation time, a gas-pressure measuring method, a gas-flow-rate measuring method, and a gas sensor. A reception wave which has been transmitted and received by an ultrasonic element 5 is shaped and integrated by an integration circuit 67 to obtain an integral value. A peak value of the integral value is held by a peak-hold circuit 39. As to detection of gas concentration, a resistance-voltage-division circuit 41 sets a reference value on the basis of the peak value, and a point in time when the integral value of the reception wave is judged by a comparator 43 to have reached the reference value is regarded as an arrival time. Subsequently, a gas concentration is detected on the basis of a period between the emission time and the arrival time. As to detection of gas pressure and flow rate, the gas pressure is detected on the basis of the peak value, and further, the gas flow rate is calculated on the basis of the gas pressure.

    摘要翻译： 能够确定准确的传播时间的超声波传播时间测量方法，气体压力测量方法，气体流量测量方法和气体传感器。 由超声波元件5发送和接收的接收波被积分电路67整形并积分以获得积分值。 积分值的峰值由峰值保持电路39保持。关于气体浓度的检测，电阻分压电路41基于峰值设定基准值， 接收波的积分值由比较器43判定为已经达到基准值被认为是到达时间。 随后，基于发射时间和到达时间之间的周期来检测气体浓度。 关于气体压力和流量的检测，基于峰值检测气体压力，此外，基于气体压力计算气体流量。

    Ultrasonic-wave propagation-time measuring method and gas concentration sensor
    2.
    发明授权
    Ultrasonic-wave propagation-time measuring method and gas concentration sensor 失效
    超声波传播时间测量方法和气体浓度传感器

    公开(公告)号：US06886412B2

    公开(公告)日：2005-05-03

    申请号：US10076423

    申请日：2002-02-19

    申请人： Keigo Banno ,  Hideki Ishikawa ,  Yoshikuni Sato ,  Noboru Ishida ,  Takafumi Oshima

    发明人： Keigo Banno ,  Hideki Ishikawa ,  Yoshikuni Sato ,  Noboru Ishida ,  Takafumi Oshima

    IPC分类号： G01N29/02 ,  F02D35/00 ,  F02D45/00 ,  G01H5/00 ,  G01N29/00 ,  G01N29/024 ,  G01N29/38 ,  G01N29/40 ,  G01F1/66

    CPC分类号： G01N29/40 ,  G01N29/024 ,  G01N29/38 ,  G01N2291/0217 ,  G01N2291/02809

    摘要： An ultrasonic-wave propagation-time measuring method and gas concentration sensor are disclosed in which a reception wave which has been transmitted and received by an ultrasonic element 5 is subjected to full-wave rectification in order to obtain a full-wave-rectified wave, which is then integrated by an integration circuit 37 to obtain an integral value. A peak value of the integral value is held by a peak-hold circuit 39. As to detection of gas concentration, a threshold-level calculation section 21e sets a reference value on the basis of the peak value, and a point in time when the amplitude of a reception wave having undergone full-wave rectification is judged by a comparator 43 to have reached the reference value is regarded as an arrival time. Subsequently, a gas concentration is determined on the basis of a period between the emission time and the arrival time.

    摘要翻译： 公开了一种超声波传播时间测量方法和气体浓度传感器，其中由超声波元件5发送和接收的接收波被进行全波整流，以获得全波整流波， 然后将其由积分电路37积分以获得积分值。 积分值的峰值由峰值保持电路39保持。 关于气体浓度的检测，阈值电平计算部21e基于峰值设定基准值，并且通过比较器判定经过全波整流的接收波的振幅的时间点 43已达到参考值被视为到达时间。 随后，基于发射时间和到达时间之间的周期来确定气体浓度。

    Gas concentration sensor
    3.
    发明授权
    Gas concentration sensor 失效
    气体浓度传感器

    公开(公告)号：US06308572B1

    公开(公告)日：2001-10-30

    申请号：US09504118

    申请日：2000-02-15

    申请人： Hideki Ishikawa ,  Yoshikuni Sato ,  Keigo Banno ,  Noboru Ishida ,  Takafumi Oshima

    发明人： Hideki Ishikawa ,  Yoshikuni Sato ,  Keigo Banno ,  Noboru Ishida ,  Takafumi Oshima

    IPC分类号： G01H500

    CPC分类号： G01N29/222 ,  G01N29/024 ,  G01N2291/0212 ,  G01N2291/0217 ,  G01N2291/0258 ,  G01N2291/02809 ,  G01N2291/02836 ,  G01N2291/045

    摘要： A gas concentration sensor comprises an ultrasonic element 33 opposite a reflection surface 34. A depression 34a is formed on an edge portion of a reflection surface 34 which is in contact with a side wall of a measurement chamber 32 such that a bottom surface of the depression 34a is substantially in parallel with the reflection surface 34. The distance between the ultrasonic element 33 and the edge portion of the reflection surface 34 becomes greater than the distance between the ultrasonic element 33 and a central portion of the reflection surface 34. As a result, an indirect wave, which impinges obliquely on the side wall of the measurement chamber 32 and propagates along the side wall, is reflected from the bottom surface of the depression 34a and propagates. Thus, the propagation distance of this indirect wave becomes greater as compared to the case where the reflection surface 34 is flat, so that the indirect wave is not combined with a direct wave in the vicinity of a modulation point of the direct wave. That is, since the modulation point of the direct wave can be detected accurately, a time interval between a modulation point of a transmitted wave and that of a received wave can be measured as the propagation time of an ultrasonic wave, thereby enabling accurate determination of gas concentration.

    摘要翻译： 气体浓度传感器包括与反射面34相对的超声波元件33.凹部34a形成在与测量室32的侧壁接触的反射面34的边缘部分上，使得凹部 34a与反射面34大致平行。超声波元件33与反射面34的边缘部之间的距离变得大于超声波元件33与反射面34的中央部之间的距离。其结果是， ，从斜面34a的底面反射而沿着测量室32的侧壁倾斜并沿侧壁传播的间接波被传播。 因此，与反射面34平坦的情况相比，该间接波的传播距离变大，因此间接波不与直接波的调制点附近的直接波组合。 也就是说，由于可以精确地检测直接波的调制点，所以可以测量发射波的调制点和接收波的调制点之间的时间间隔作为超声波的传播时间，从而能够准确地确定 气体浓度。

    Sensor and method for manufacturing the same
    4.
    发明授权
    Sensor and method for manufacturing the same 失效
    传感器及其制造方法

    公开(公告)号：US07080543B2

    公开(公告)日：2006-07-25

    申请号：US10409587

    申请日：2003-04-09

    申请人： Hideki Ishikawa ,  Yoshikuni Sato ,  Keigo Banno ,  Masashi Sakamoto ,  Noboru Ishida ,  Takafumi Oshima

    发明人： Hideki Ishikawa ,  Yoshikuni Sato ,  Keigo Banno ,  Masashi Sakamoto ,  Noboru Ishida ,  Takafumi Oshima

    IPC分类号： G01N29/02

    CPC分类号： G01N29/223 ,  G01N2291/021 ,  G01N2291/02809 ,  G01N2291/02818 ,  G01N2291/02881

    摘要： A detecting-element assembly (40) is configured such that a piezoelectric element (51) is housed in a casing body portion (43) of a casing (42), and is attached to a housing portion (22) of a flow path formation member (20) via a flange portion (41). Therefore, the path between the piezoelectric element (51) and the position of attachment of the detecting-element assembly (40) is elongated, whereby ultrasonic waves which leak into the interior of the detecting-element assembly (40) from the piezoelectric element (51) become unlikely to reflectively return from a joint. Thus, the influence of, for example, noise stemming from reflected waves is reduced, thereby enhancing the accuracy of detection. An average clearance of 1 millimeter or more is provided along the outer circumferential surface of the casing body portion (43) of the detecting-element assembly (40), whereby a problem of collected foreign matter is unlikely to occur.

    摘要翻译： 检测元件组件（40）构造成使得压电元件（51）容纳在壳体（42）的壳体主体部分（43）中，并且附接到流路形成的壳体部分（22） 构件（20）经由凸缘部分（41）。 因此，压电元件（51）与检测元件组件（40）的安装位置之间的路径被拉长，从而从压电元件（...）泄漏到检测元件组件（40）的内部的超声波 51）变得不可能从联合反射回来。 因此，降低了例如由反射波产生的噪声的影响，从而提高了检测的准确性。 沿着检测元件组件（40）的壳体主体部（43）的外周面设置有1毫米以上的平均间隙，由此不可能发生收集的异物问题。

    Gas concentration sensor
    5.
    发明授权
    Gas concentration sensor 失效
    气体浓度传感器

    公开(公告)号：US06418782B1

    公开(公告)日：2002-07-16

    申请号：US09480663

    申请日：2000-01-11

    申请人： Yoshikuni Sato ,  Noboru Ishida ,  Hideki Ishikawa ,  Takafumi Oshima ,  Yasushi Sato

    发明人： Yoshikuni Sato ,  Noboru Ishida ,  Hideki Ishikawa ,  Takafumi Oshima ,  Yasushi Sato

    IPC分类号： G01N2902

    CPC分类号： G01N29/36 ,  G01N29/024 ,  G01N2291/011 ,  G01N2291/0215 ,  G01N2291/0258 ,  G01N2291/02809 ,  G01N2291/045

    摘要： When a sensor has deteriorated, the propagation time T1′ of a first reflection wave becomes greater than the propagation time T1 of a first reflection wave as measured in a new sensor. If measurement of the concentration of a specific gas is based on the propagation time T1 of the first reflection wave as measured in the new sensor, gas concentration cannot be determined accurately. By contrast, a reflection wave other than the first reflection wave (for example, a second reflection wave) is merely reflected off the surface of the ultrasonic element and is not affected by the internal structure of the ultrasonic element. Therefore, even when the sensor is deteriorated, the propagation time T2, T2′ of the second reflection wave exhibits less variation and is less susceptible to deterioration of the sensor. Therefore, the concentration of a specific gas is determined on the basis of the propagation time of the second reflection wave, which is less susceptible to deterioration of the sensor, instead of the propagation time of the first reflection wave, which is more susceptible to deterioration of the sensor. Thus, gas concentration can be measured accurately.

    摘要翻译： 当传感器恶化时，第一反射波的传播时间T1'变得大于在新传感器中测量的第一反射波的传播时间T1。 如果特定气体的浓度的测定是基于在新传感器中测定的第一反射波的传播时间T1，则不能准确地确定气体浓度。 相反，除了第一反射波（例如，第二反射波）之外的反射波仅仅从超声波元件的表面反射，并且不受超声波元件的内部结构的影响。 因此，即使在传感器劣化的情况下，第二反射波的传播时间T2'T2'变化较小，也不易受传感器劣化的影响。 因此，特定气体的浓度基于不易受传感器劣化的第二反射波的传播时间而不是更容易劣化的第一反射波的传播时间而确定 的传感器。 因此，可以准确测量气体浓度。

    Method and apparatus using a gas concentration sensor for accurately controlling an air fuel ratio in an internal combustion engine
    6.
    发明授权
    Method and apparatus using a gas concentration sensor for accurately controlling an air fuel ratio in an internal combustion engine 失效
    使用气体浓度传感器来精确地控制内燃机的空燃比的方法和装置

    公开(公告)号：US06568240B1

    公开(公告)日：2003-05-27

    申请号：US09480661

    申请日：2000-01-11

    申请人： Yoshikuni Sato ,  Noboru Ishida ,  Hideki Ishikawa ,  Takafumi Oshima ,  Yasushi Sato

    发明人： Yoshikuni Sato ,  Noboru Ishida ,  Hideki Ishikawa ,  Takafumi Oshima ,  Yasushi Sato

    IPC分类号： G01N2726

    CPC分类号： F02D41/1459 ,  F02D41/0042 ,  F02D41/0045 ,  F02D41/144 ,  F02D41/2441 ,  F02D41/2474 ,  F02D2200/0614 ,  G01N2291/02809

    摘要： The present invention provides a method and apparatus using a gas concentration sensor for accurately controlling an air fuel ratio in an internal combustion engine, featuring in that before the fuel-vaporized gas purged from the canister enters into the intake manifold whereat the sensor detects the gas concentration of the purged gas, the sensor is adjusted so as to adjust a zero point (or zero output level) of the sensor output. In step 100 of FIG. 7, a judgment is made as to whether the flow rate of air reaches a predetermined level. In step 110, processing for zero-point correction of the gas concentration sensor is performed. Specifically, in a state in which the purge valve 17 is closed, concentration of purge gas is measured by use of the gas concentration sensor 4, and a sensor output S1 at that time is obtained. Subsequently, the sensor output S1 is compared with a correct sensor output S0 in order to obtain a difference &Dgr;S therebetween. Accordingly, during subsequent gas concentration measurement, a value S3 obtained through subtraction of the difference &Dgr;S from an obtained sensor output S2 is used as a correct sensor output. In step 120, a supply amount of purge gas, i.e., a concentration of the purge gas to be supplied is obtained. In subsequent step 130, the purge valve 17 is driven in order to supply purge gas to the intake pipe 2 in a required amount (A%).

    摘要翻译： 本发明提供了一种使用气体浓度传感器来精确地控制内燃机中的空燃比的方法和装置，其特征在于在从罐排出的燃料汽化气体进入进气歧管之前，传感器检测到气体 净化气体的浓度，调节传感器以调节传感器输出的零点（或零输出水平）。 在图1的步骤100中 如图7所示，判断空气流量是否达到预定水平。 在步骤110中，进行气体浓度传感器的零点校正处理。 具体地说，在关闭吹扫阀17的状态下，利用气体浓度传感器4测定净化气体的浓度，得到此时的传感器输出S1。 随后，将传感器输出S1与正确的传感器输出S0进行比较，以获得它们之间的差值DELTAS。 因此，在后续的气体浓度测量中，使用通过从获得的传感器输出S2中减去差值DELTAS获得的值S3作为正确的传感器输出。 在步骤120中，获得净化气体的供给量，即所供给的净化气体的浓度。 在随后的步骤130中，驱动排气阀17，以便以所需量（A％）向进气管2供应净化气体。

    Method and apparatus for measuring NOx gas concentration
    7.
    发明授权
    Method and apparatus for measuring NOx gas concentration 有权
    测量NOx气体浓度的方法和装置

    公开(公告)号：US06695964B1

    公开(公告)日：2004-02-24

    申请号：US09588504

    申请日：2000-06-07

    申请人： Masashi Ando ,  Noboru Ishida ,  Satoshi Sugaya ,  Takafumi Oshima ,  Norihiko Nadanami ,  Takaki Ootuka ,  Yoshikuni Sato ,  Tatsuo Okumura

    发明人： Masashi Ando ,  Noboru Ishida ,  Satoshi Sugaya ,  Takafumi Oshima ,  Norihiko Nadanami ,  Takaki Ootuka ,  Yoshikuni Sato ,  Tatsuo Okumura

    IPC分类号： G01N27407

    CPC分类号： G01N27/4074

    摘要： Method and sensor for measuring accurate measurement of NOx concentration in an exhaust gas containing O2,H2O, CO2 and NOx and a NOx gas concentration sensor. A first oxygen pump cell sufficiently pumps out oxygen in a measurement gas such as not to decompose NOx. A pair of electrodes is provided on an inner side and an outer side of a second measurement chamber into which the gas is introduced from a first measurement chamber via a diffusion resistance. A voltage is impressed across the paired electrodes for decomposing NOx in the second measurement chamber to dissociate oxygen which causes the current to flow in a second oxygen ion pump cell. The NOx gas concentration is measured for this current. The voltage impressed across the paired electrodes of the second oxygen ion pump cell is set so as not to dissociate H2O and CO2 present in the second measurement chamber.

    摘要翻译： 用于测量含有O 2，H 2 O，CO 2和NO x以及NOx气体浓度传感器的废气中的NOx浓度的精确测量的方法和传感器。 第一氧气泵电池在测量气体中充分抽出氧气，例如不分解NOx。 一对电极设置在第二测量室的内侧和外侧，气体通过扩散阻力从第一测量室引入到该第二测量室中。 在一对电极上施加电压，用于分解第二测量室中的NOx，以解离氧，这导致电流在第二氧离子泵电池中流动。 测量该电流的NOx气体浓度。 设置在第二氧离子泵电池的成对电极上施加的电压，以使第二测量室中不存在H 2 O和CO 2。