公开(公告)号：US20210010846A1

公开(公告)日：2021-01-14

申请号：US16902383

申请日：2020-06-16

Applicant: DENSO CORPORATION

Inventor： Yuuya SHIBATA ,  Hironori Iwamiya ,  Akihiro Konno

IPC: G01F23/296 ,  G01K13/00 ,  G01N33/28

Abstract: An ultrasonic distance measuring device retrieves an ultrasonic wave propagation speed from a correlation between an output of a medium sensor and a corresponding ultrasonic wave propagation speed. The ultrasonic distance measuring device sets a propagation path detection period for detecting a detection signal, which corresponds to the ultrasonic wave reflected by a liquid surface, based on a longest propagation path length and a shortest propagation path length between the liquid surface and the retrieved propagation speed of the ultrasonic wave. The ultrasonic distance measuring device calculates a distance of the propagation path based on a time difference between a detection timing of the detection signal and an output timing of the ultrasonic wave in a propagation path detection period, and the propagation speed of the ultrasonic wave.

公开(公告)号：US09821651B2

公开(公告)日：2017-11-21

申请号：US15125978

申请日：2015-03-26

Applicant: DENSO CORPORATION

Inventor： Tatsuya Kakehi ,  Noboru Nagase ,  Kiyoshi Nagata ,  Akihiro Konno

IPC: H02G3/04 ,  B60K15/035 ,  F02M37/10 ,  F02D33/00 ,  B60K15/05 ,  F02M37/00 ,  H02K5/22 ,  F02M25/08 ,  F02M37/08 ,  B60K15/03 ,  B60K15/04

CPC classification number: B60K15/035 ,  B60K15/05 ,  B60K2015/03236 ,  B60K2015/0458 ,  F02D33/003 ,  F02M25/08 ,  F02M37/0076 ,  F02M37/0082 ,  F02M37/08 ,  F02M37/10 ,  F02M37/103 ,  F02M2037/082 ,  F02M2037/085 ,  H02K5/225

Abstract: A fuel tank lid includes a lid part and a terminal. The lid part includes an inserted part inserted into an opening of a fuel tank, and a storage part storing a drive circuit. The terminal has a central portion covered by the inserted part and the storage part, a first end connected to a pump, and a second end connected to the drive circuit. The storage part includes a side wall that has a first opening and a second opening, an upper closure part that closes the first opening, and a lower closure part that closes the second opening. The fuel tank lid further includes a discharge structure positioned vertically lower than the upper closure part and discharging a fuel vapor that has travelled along an interface between the terminal and the lid part and entered a hollow space of the storage part, to an external atmosphere.

公开(公告)号：US11454532B2

公开(公告)日：2022-09-27

申请号：US16921141

申请日：2020-07-06

Applicant: DENSO CORPORATION

Inventor： Kyoko Kurokawa ,  Takuya Koizumi ,  Akihiro Konno ,  Hironori Iwamiya

IPC: G01F23/2962 ,  G01B17/00

Abstract: 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.

公开(公告)号：US11435216B2

公开(公告)日：2022-09-06

申请号：US16920886

申请日：2020-07-06

Applicant: DENSO CORPORATION

Inventor： Akihiro Konno ,  Hironori Iwamiya ,  Takuya Koizumi

IPC: G01F23/2962 ,  B60K15/03 ,  B60R16/023

Abstract: 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.

公开(公告)号：US11385095B2

公开(公告)日：2022-07-12

申请号：US16902383

申请日：2020-06-16

Applicant: DENSO CORPORATION

Inventor： Yuuya Shibata ,  Hironori Iwamiya ,  Akihiro Konno

IPC: G01F23/2962 ,  G01N33/28 ,  G01K13/00

Abstract: An ultrasonic distance measuring device retrieves an ultrasonic wave propagation speed from a correlation between an output of a medium sensor and a corresponding ultrasonic wave propagation speed. The ultrasonic distance measuring device sets a propagation path detection period for detecting a detection signal, which corresponds to the ultrasonic wave reflected by a liquid surface, based on a longest propagation path length and a shortest propagation path length between the liquid surface and the retrieved propagation speed of the ultrasonic wave. The ultrasonic distance measuring device calculates a distance of the propagation path based on a time difference between a detection timing of the detection signal and an output timing of the ultrasonic wave in a propagation path detection period, and the propagation speed of the ultrasonic wave.

公开(公告)号：US11181635B2

公开(公告)日：2021-11-23

申请号：US16785815

申请日：2020-02-10

Applicant: DENSO CORPORATION

Inventor： Takuya Koizumi ,  Hironori Iwamiya ,  Akihiro Konno

IPC: G01S15/08

Abstract: 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.