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    ULTRASONIC DISTANCE MEASURING DEVICE
    2.
    发明申请
    ULTRASONIC DISTANCE MEASURING DEVICE 有权

    公开(公告)号：US20210010848A1

    公开(公告)日：2021-01-14

    申请号：US16921141

    申请日：2020-07-06

    申请人： DENSO CORPORATION

    发明人： Kyoko KUROKAWA ,  Takuya KOIZUMI ,  Akihiro KONNO ,  Hironori IWAMIYA

    IPC分类号： G01F23/296 ,  G01B17/00

    摘要： A first arithmetic circuit computes a propagation velocity of an ultrasonic wave based on a first time difference between an output timing, at which an ultrasonic element outputs an ultrasonic wave, and a reference timing, at which a comparator circuit outputs a detection signal on reflection off a distal end of a reference pipe, and a length of the reference pipe. A period circuit sets a propagation path detection period to detect a liquid level timing, at which the comparator circuit outputs the detection signal on reflection off the liquid level, based on a longest and shortest propagation path lengths and the propagation velocity. A second arithmetic circuit computes the length of the propagation path based on a second time difference, which is between the liquid level timing and the output timing during the propagation path detection period, and the propagation velocity.

    ULTRASONIC DISTANCE MEASURING DEVICE
    3.
    发明申请
    ULTRASONIC DISTANCE MEASURING DEVICE 有权

    公开(公告)号：US20210010847A1

    公开(公告)日：2021-01-14

    申请号：US16920886

    申请日：2020-07-06

    申请人： DENSO CORPORATION

    发明人： Akihiro KONNO ,  Hironori IWAMIYA ,  Takuya KOIZUMI

    IPC分类号： G01F23/296 ,  B60R16/023 ,  B60K15/03

    摘要： An ultrasonic element generates an ultrasonic wave and converts an input ultrasonic wave into an electric signal. A transmission circuit outputs a drive signal to the ultrasonic element. A comparator circuit outputs a first detection signal when the electric signal becomes larger than a threshold value and outputs a second detection signal when the electric signal becomes smaller than the threshold value. An arithmetic circuit computes a distance of a propagation path of the ultrasonic wave based on a time difference between an output timing, at which the ultrasonic element outputs of the ultrasonic wave, and a liquid level timing, at which the comparator circuit outputs the first detection signal, and based on a propagation speed of the ultrasonic wave. A storage unit stores a time difference between the first detection signal and the second detection signal. The transmission circuit increases the drive signal, as the time difference decreases.

    ULTRASONIC DISTANCE DETECTOR
    4.
    发明申请
    ULTRASONIC DISTANCE DETECTOR 审中-公开

    公开(公告)号：US20200256985A1

    公开(公告)日：2020-08-13

    申请号：US16785815

    申请日：2020-02-10

    申请人： DENSO CORPORATION

    发明人： Takuya KOIZUMI ,  Hironori IWAMIYA ,  Akihiro KONNO

    IPC分类号： G01S15/08

    摘要： A liquid level detector has an ultrasonic sensor connected thereto by two signal lines. When a drive signal is output from a drive circuit, the drive signal is output via an impedance matching circuit, thereby transmission and reception signals on the signal lines flow as complementary level signals. A receiver circuit obtains an amplified signal by amplifying the transmission and reception signals with a differential amplifier circuit, and by cutting a same phase noise signal.