Patents by Inventor Hiroaki Igarashi
Hiroaki Igarashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240167250Abstract: A work machine includes: a work device including a plurality of hydraulic actuators and a plurality of driving target members; a posture sensor that senses posture information of the work device; a control valve unit that controls flows of hydraulic operating fluid supplied from the hydraulic pump to the plurality of hydraulic actuators; a plurality of solenoid valves that generate pilot pressure for driving the control valve unit; and a controller that computes a command value of the pilot pressure to be generated by the solenoid valves, and outputs a control signal corresponding to the command value to the solenoid valves.Type: ApplicationFiled: September 8, 2022Publication date: May 23, 2024Inventors: Teruki IGARASHI, Ryohei FUKUCHI, Yusuke SUZUKI, Hiroaki TANAKA, Mitsuhiko KANEHAMA
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Patent number: 11991375Abstract: A moving image encoding device includes: a parameter correction unit that corrects an encoding parameter for encoding a moving image; a block arrangement determination unit that determines block information used for encoding the moving image; and an encoding unit that encodes the moving image, the block arrangement determination unit acquires the corrected encoding parameter, and determines and outputs the block information, and the encoding unit encodes the moving image by using the encoding parameter before correction and the block information output by the block arrangement determination unit.Type: GrantFiled: March 26, 2019Date of Patent: May 21, 2024Assignee: NEC CORPORATIONInventor: Hiroaki Igarashi
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Publication number: 20220284595Abstract: An object tracking device includes an object detection unit and a matching unit. The object detection unit includes a plurality of detectors having different processing speeds or accuracy. The object detection unit detects, for each of frames of image data input in time series, each object from the image data using one detector selected from the plurality of the detectors. The matching unit matches a current object detection result which the object detection unit generates from image data of a current frame with a previous object detection result which the object detection unit generates from image data of a previous frame before the current frame, and generates a tracking result of the object based on a matching result.Type: ApplicationFiled: July 25, 2019Publication date: September 8, 2022Applicant: NEC CorporationInventors: Hiroaki IGARASHI, Seiya SHIBATA, Liang FENG
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Publication number: 20220201319Abstract: A moving image encoding device includes: a parameter correction unit that corrects an encoding parameter for encoding a moving image; a block arrangement determination unit that determines block information used for encoding the moving image; and an encoding unit that encodes the moving image, the block arrangement determination unit acquires the corrected encoding parameter, and determines and outputs the block information, and the encoding unit encodes the moving image by using the encoding parameter before correction and the block information output by the block arrangement determination unit.Type: ApplicationFiled: March 26, 2019Publication date: June 23, 2022Applicant: NEC CorporationInventor: Hiroaki IGARASHI
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Patent number: 10834402Abstract: This quantization device includes a processor configured to calculate first costs in a plurality of data length candidates in consideration of the compression ratio and image quality deterioration due to compression of an image. The cost calculation processing is common processing partially performed among the plurality of data length candidates. The processor is configured to perform the common processing for the plurality of data length candidates, execute the distributed processes in parallel, and determine, as an optimal data length, a single data length for which a minimum cost is calculated among the first costs of the plurality of data length candidate.Type: GrantFiled: January 17, 2018Date of Patent: November 10, 2020Assignee: NEC CORPORATIONInventor: Hiroaki Igarashi
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Publication number: 20190373262Abstract: This quantization device includes a processing unit which calculates the cost involved in a plurality of data lengths in consideration of the compression ratio and image quality deterioration due to compression of an image. A process for calculating the cost is partially common among the plurality of data lengths. The processing unit distributes the common process for the plurality of data lengths, executes the distributed processes in parallel, and thereby determines, as an optimal data length, one data length the cost for which is the lowest, among the plurality of data lengths.Type: ApplicationFiled: January 17, 2018Publication date: December 5, 2019Applicant: NEC CorporationInventor: Hiroaki IGARASHI
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Patent number: 10254733Abstract: A motor control device avoids the difficulties associated with safely controlling a motor using a second calculation unit when a first calculation unit malfunctions. A motor control device monitors a malfunction of a first microcomputer and a malfunction of a first CPU of the first microcomputer and performs a determination based on a result of a second external communication functional unit. When the determination is normal, the process proceeds determine that the first CPU is normal and a second CPU malfunctions. Therefore, it is possible to continue processing using the first CPU in this case.Type: GrantFiled: May 11, 2015Date of Patent: April 9, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Tatsuya Hatakeyama, Hiroaki Igarashi, Hideyuki Sakamoto
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Publication number: 20180316920Abstract: A video image encoding device includes a generator that generates position information indicating, for each size of an image block, a position of each of a plurality of image blocks in an image, and an image processor that executes transform processing for an image block of a predetermined size at a position indicated by the generated position information.Type: ApplicationFiled: October 19, 2016Publication date: November 1, 2018Applicant: NEC CorporationInventor: Hiroaki IGARASHI
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Patent number: 9991785Abstract: The objective of the present invention is to provide an electric power converting device with which can executes a ground fault detection in a short time with its inexpensive configuration. In one step, the electric power converting device performs level comparison of a difference between output values of low pass filters, with a threshold value ?E. If a W-phase is shorted to ground at a time when the U-phase and V-phase lower arm IGBTs are ON and W-phase upper IGBT is ON, the difference between the output values of the low pass filters and becomes small. In another step, a level comparison is made between the absolute value of a difference between the U-phase current value iu and U-phase current command value iu?, and a threshold value F. If the absolute value is lower than the threshold value, the result is determined to be normal, and if the absolute value is greater than the threshold value, the result is determined to be abnormal, because the U-phase is shorted to ground.Type: GrantFiled: November 6, 2015Date of Patent: June 5, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Masayoshi Kashihara, Hiroaki Igarashi
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Patent number: 9964579Abstract: An object of the present invention is to diagnose a state of a voltage divider while performing a normal measurement to improve reliability. A voltage detection apparatus according to the present invention includes: a first resistor for dividing voltage of a detection unit into a first divided voltage value; and a test pattern insertion circuit unit including a second resistor for dividing the first divided voltage value into a second divided voltage value and a switching device, wherein the test pattern insertion circuit unit is connected to an equipotential connection point to the first divided voltage value, and wherein a state of the first resistor is detected based on the second divided voltage value when the switching device is conductive.Type: GrantFiled: June 17, 2015Date of Patent: May 8, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Hiroaki Igarashi, Masayoshi Kashihara, Tatsuya Hatakeyama, Koichi Yahata, Hideyuki Sakamoto
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Publication number: 20170338733Abstract: The objective of the present invention is to provide an electric power converting device with which can executes a ground fault detection in a short time with its inexpensive configuration. In one step, the electric power converting device performs level comparison of a difference between output values of low pass filters, with a threshold value ?E. If a W-phase is shorted to ground at a time when the U-phase and V-phase lower arm IGBTs are ON and W-phase upper IGBT is ON, the difference between the output values of the low pass filters and becomes small. In another step, a level comparison is made between the absolute value of a difference between the U-phase current value iu and U-phase current command value iu?, and a threshold value F. If the absolute value is lower than the threshold value, the result is determined to be normal, and if the absolute value is greater than the threshold value, the result is determined to be abnormal, because the U-phase is shorted to ground.Type: ApplicationFiled: November 6, 2015Publication date: November 23, 2017Inventors: Masayoshi KASHIHARA, Hiroaki IGARASHI
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Publication number: 20170131698Abstract: A motor control device avoids the difficulties associated with safely controlling a motor using a second calculation unit when a first calculation unit malfunctions. A motor control device monitors a malfunction of a first microcomputer and a malfunction of a first CPU of the first microcomputer and performs a determination based on a result of a second external communication functional unit. When the determination is normal, the process proceeds determine that the first CPU is normal and a second CPU malfunctions. Therefore, it is possible to continue processing using the first CPU in this case.Type: ApplicationFiled: May 11, 2015Publication date: May 11, 2017Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Tatsuya HATAKEYAMA, Hiroaki IGARASHI, Hideyuki SAKAMOTO
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Publication number: 20170089969Abstract: An object of the present invention is to diagnose a state of a voltage divider while performing a normal measurement to improve reliability. A voltage detection apparatus according to the present invention includes: a first resistor for dividing voltage of a detection unit into a first divided voltage value; and a test pattern insertion circuit unit including a second resistor for dividing the first divided voltage value into a second divided voltage value and a switching device, wherein the test pattern insertion circuit unit is connected to an equipotential connection point to the first divided voltage value, and wherein a state of the first resistor is detected based on the second divided voltage value when the switching device is conductive.Type: ApplicationFiled: June 17, 2015Publication date: March 30, 2017Inventors: Hiroaki IGARASHI, Masayoshi KASHIHARA, Tatsuya HATAKEYAMA, Koichi YAHATA, Hideyuki SAKAMOTO
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Patent number: 8976551Abstract: A power converter includes an inverter unit that includes a plurality of semiconductor switching elements constituting upper and lower arms and converts DC power into AC power; a gate driving unit that outputs, to the inverter unit, a gate signal used to drive gates of the plurality of semiconductor switching elements; a driving control unit that supplies the gate driving unit with a switching control signal used for the gate driving unit to output the gate signal; a first abnormality detection unit that performs over voltage detection of the DC power and over current detection of the AC power and temperature detection of the upper and lower arms; and a second abnormality detection unit that detects abnormality of the plurality of semiconductor switching elements of the upper arm and lower arms, wherein the driving control unit includes a first protection circuit and a second protection circuit.Type: GrantFiled: December 7, 2010Date of Patent: March 10, 2015Assignee: Hitachi Automotive Systems, Ltd.Inventors: Hiroaki Igarashi, Satoru Shigeta, Takashi Ogura
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Publication number: 20140092655Abstract: A power converter includes an inverter unit that includes a plurality of semiconductor switching elements constituting upper and lower arms and converts DC power into AC power; a gate driving unit that outputs, to the inverter unit, a gate signal used to drive gates of the plurality of semiconductor switching elements; a driving control unit that supplies the gate driving unit with a switching control signal used for the gate driving unit to output the gate signal; a first abnormality detection unit that performs over voltage detection of the DC power and over current detection of the AC power and temperature detection of the upper and lower arms; and a second abnormality detection unit that detects abnormality of the plurality of semiconductor switching elements of the upper arm and lower arms, wherein the driving control unit includes a first protection circuit and a second protection circuit.Type: ApplicationFiled: December 7, 2010Publication date: April 3, 2014Applicant: Hitachi Automotive Systems, Ltd.Inventors: Hiroaki Igarashi, Satoru Shigeta, Takashi Ogura
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Patent number: 8605471Abstract: A power conversion device includes: an inverter that converts a DC current supplied from a DC power source to an AC current by engaging a plurality of switching elements, which constitute an upper arm, and a plurality of switching elements, which constitute a lower arm, in switching operation; a control unit that includes a signal generation unit that generates a switching signal carrying a command for execution of the switching operation in correspondence to each of the plurality of switching elements constituting the upper arm and the plurality of switching elements constituting the lower arm, and outputs the switching signal thus generated as a control signal; and a drive unit that individually drives each of the switching elements based upon the corresponding control signals.Type: GrantFiled: June 15, 2011Date of Patent: December 10, 2013Assignee: Hitachi Automotive System, Ltd.Inventors: Takashi Ogura, Satoru Shigeta, Hiroaki Igarashi, Koichi Ono, Yasuo Noto
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Publication number: 20110310644Abstract: A power conversion device includes: an inverter that converts a DC current supplied from a DC power source to an AC current by engaging a plurality of switching elements, which constitute an upper arm, and a plurality of switching elements, which constitute a lower arm, in switching operation; a control unit that includes a signal generation unit that generates a switching signal carrying a command for execution of the switching operation in correspondence to each of the plurality of switching elements constituting the upper arm and the plurality of switching elements constituting the lower arm, and outputs the switching signal thus generated as a control signal; and a drive unit that individually drives each of the switching elements based upon the corresponding control signals.Type: ApplicationFiled: June 15, 2011Publication date: December 22, 2011Applicant: Hitachi Automotive Systems, Ltd.Inventors: Takashi OGURA, Satoru Shigeta, Hiroaki Igarashi, Koichi Ono, Yasuo Noto
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Patent number: 8040088Abstract: A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board.Type: GrantFiled: June 8, 2009Date of Patent: October 18, 2011Assignee: Hitachi, Ltd.Inventors: Hiroshi Katayama, Koichi Yahata, Masashige Tsuji, Takashi Fujimoto, Hiroaki Igarashi
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Publication number: 20090243524Abstract: A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board.Type: ApplicationFiled: June 8, 2009Publication date: October 1, 2009Applicant: Hitachi, Ltd.Inventors: Hiroshi Katayama, Koichi Yahata, Masashige Tsuji, Takashi Fujimoto, Hiroaki Igarashi
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Patent number: 7561448Abstract: A power inverter comprises a power module connected at least to a rotating electric machine, a gate drive circuit board which supplies switching power to the power module, and a rotating electric machine control circuit board which supplies a signal for controlling the waveform of the switching power to the gate drive circuit board. A noise reduction board is formed on a board different from the rotating electric machine control circuit board. The configuration of the noise reduction board is such that various signals for forming a signal for controlling the waveform of the switching power by means of the rotating electric machine control circuit board are inputted through the noise reduction board to the rotating electric machine control circuit board.Type: GrantFiled: April 5, 2007Date of Patent: July 14, 2009Assignee: Hitachi, Ltd.Inventors: Hiroshi Katayama, Koichi Yahata, Masashige Tsuji, Takashi Fujimoto, Hiroaki Igarashi