Patents by Inventor Yasuji Ishizuka
Yasuji Ishizuka 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: 20230070916Abstract: A network measurement device includes a setting control unit that sets, for example, a single GNSS as a transmission source of a signal of a multi-band, a multi-band abnormality detection unit that detects a multi-band reception abnormality based on an existing GNSS antenna receiving a signal in the multi-band transmitted from the GNSS, which is the transmission source, and reception signal information obtained by reception processing in a state in which the network measurement device is connected to the apparatus of a moving destination, for example, a boundary clock, and the existing GNSS antenna is connected to an antenna input terminal, for example, and an alert notification control unit that notifies a user of an alert notification that a multi-band reception abnormality occurs when a multi-band reception abnormality is detected.Type: ApplicationFiled: May 23, 2022Publication date: March 9, 2023Inventors: Atsushi FURUKI, Yasuji ISHIZUKA, Shinichi SETO
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Patent number: 8607545Abstract: An air-fuel ratio control device is provided for controlling the air-fuel ratio of an engine. The device includes an exhaust passage having a main catalytic converter and a bypass passage having a bypass catalytic converter, the bypass passage diverging from the exhaust passage at an upstream junction and rejoining the exhaust passage at a downstream junction. A valve mechanism disposed in the exhaust passage between the upstream junction and the downstream junction moves between a closed state and an open state. During a predetermined period of time after the valve mechanism opens to permit flow in the exhaust passage, the air-fuel ratio of the engine is controlled based on a signal from a first air-fuel ratio sensor in the bypass passage using a low response correction value that is less than a normal response correction value that would be used when the valve mechanism is closed.Type: GrantFiled: January 24, 2012Date of Patent: December 17, 2013Assignee: Nissan Motor Co., Ltd.Inventors: Yoshiyuki Ootake, Yasuji Ishizuka, Masaki Koga
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Publication number: 20120117950Abstract: An air-fuel ratio control device is provided for controlling the air-fuel ratio of an engine. The device includes an exhaust passage having a main catalytic converter and a bypass passage having a bypass catalytic converter, the bypass passage diverging from the exhaust passage at an upstream junction and rejoining the exhaust passage at a downstream junction. A valve mechanism disposed in the exhaust passage between the upstream junction and the downstream junction moves between a closed state and an open state. During a predetermined period of time after the valve mechanism opens to permit flow in the exhaust passage, the air-fuel ratio of the engine is controlled based on a signal from a first air-fuel ratio sensor in the bypass passage using a low response correction value that is less than a normal response correction value that would be used when the valve mechanism is closed.Type: ApplicationFiled: January 24, 2012Publication date: May 17, 2012Applicant: NISSAN MOTOR CO., LTD.Inventors: Yoshiyuki Ootake, Yasuji Ishizuka, Masaki Koga
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Patent number: 8176728Abstract: An air-fuel ratio control device is provided for controlling the air-fuel ratio of an engine. The device includes an exhaust passage having a main catalytic converter and a bypass passage having a bypass catalytic converter, the bypass passage diverging from the exhaust passage at an upstream junction and rejoining the exhaust passage at a downstream junction. A valve mechanism disposed in the exhaust passage between the upstream junction and the downstream junction moves between a closed state and an open state. During a predetermined period of time after the valve mechanism opens to permit flow in the exhaust passage, the air-fuel ratio of the engine is controlled based on a signal from a first air-fuel ratio sensor in the bypass passage using a low response correction value that is less than a normal response correction value that would be used when the valve mechanism is closed.Type: GrantFiled: July 31, 2008Date of Patent: May 15, 2012Assignee: Nissan Motor Co., Ltd.Inventors: Yoshiyuki Ootake, Yasuji Ishizuka, Masaki Koga
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Patent number: 8141343Abstract: An air-fuel ratio control apparatus is basically provided with an exhaust system, a pair of sensors and a controller. The exhaust system includes an exhaust channel having a main catalytic converter, a bypass channel having a bypass catalytic converter, and a valve mechanism disposed in the exhaust channel to switch a pathway for exhaust gas from the exhaust channel to the bypass channel. The sensors output signals indicative of air-fuel ratios of exhaust flowing in their respective channels. The controller has first and second air-fuel ratio control sections that control an engine air-fuel ratio based on outputs of the sensors, respectively. The controller has a control mode switching section that switches control from the first air-fuel ratio control section to the second air-fuel ratio control section after a prescribed interval of time has elapsed from when the valve mechanism is switched from a closed state to an open state.Type: GrantFiled: December 20, 2007Date of Patent: March 27, 2012Assignee: Nissan Motor Co., Ltd.Inventors: Hiroyuki Nagai, Yoshiyuki Ootake, Yasuji Ishizuka, Masaki Koga
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Patent number: 7536999Abstract: An air-fuel ratio control apparatus is basically provided with an exhaust system, a first sensor and a controller. The exhaust system includes an exhaust channel with a main catalytic converter disposed therein, a bypass channel with a bypass catalytic converter disposed therein, and a valve mechanism disposed in the exhaust channel between the connection points of the exhaust channel to switch a pathway for exhaust gas from the exhaust channel to the bypass channel. The first sensor detects a property indicative of an air-fuel ratio of exhaust flowing in the exhaust channel at a point downstream of the valve mechanism. The controller adjusts an element temperature of the first sensor to a prescribed temperature or less during a prescribed interval of time from when the valve mechanism is switched from a closed state to an open state.Type: GrantFiled: December 20, 2007Date of Patent: May 26, 2009Assignee: Nissan Motor Co., Ltd.Inventors: Yoshiyuki Ootake, Yasuji Ishizuka, Masaki Koga, Kenichi Sato
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Publication number: 20090043481Abstract: An air-fuel ratio control device is provided for controlling the air-fuel ratio of an engine. The device includes an exhaust passage having a main catalytic converter and a bypass passage having a bypass catalytic converter, the bypass passage diverging from the exhaust passage at an upstream junction and rejoining the exhaust passage at a downstream junction. A valve mechanism disposed in the exhaust passage between the upstream junction and the downstream junction moves between a closed state and an open state. During a predetermined period of time after the valve mechanism opens to permit flow in the exhaust passage, the air-fuel ratio of the engine is controlled based on a signal from a first air-fuel ratio sensor in the bypass passage using a low response correction value that is less than a normal response correction value that would be used when the valve mechanism is closed.Type: ApplicationFiled: July 31, 2008Publication date: February 12, 2009Applicant: NISSAN MOTOR CO., LTD.Inventors: Yoshiyuki OOTAKE, Yasuji Ishizuka, Masaki Koga
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Publication number: 20080172166Abstract: An air-fuel ratio control apparatus is basically provided with an exhaust system, a pair of sensors and a controller. The exhaust system includes an exhaust channel having a main catalytic converter, a bypass channel having a bypass catalytic converter, and a valve mechanism disposed in the exhaust channel to switch a pathway for exhaust gas from the exhaust channel to the bypass channel. The sensors output signals indicative of air-fuel ratios of exhaust flowing in their respective channels. The controller has first and second air-fuel ratio control sections that control an engine air-fuel ratio based on outputs of the sensors, respectively. The controller has a control mode switching section that switches control from the first air-fuel ratio control section to the second air-fuel ratio control section after a prescribed interval of time has elapsed from when the valve mechanism is switched from a closed state to an open state.Type: ApplicationFiled: December 20, 2007Publication date: July 17, 2008Applicant: NISSAN MOTOR CO., LTD.Inventors: Hiroyuki NAGAI, Yoshiyuki OOTAKE, Yasuji ISHIZUKA, Masaki KOGA
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Publication number: 20080172167Abstract: An air-fuel ratio control apparatus is basically provided with an exhaust system, a first sensor and a controller. The exhaust system includes an exhaust channel with a main catalytic converter disposed therein, a bypass channel with a bypass catalytic converter disposed therein, and a valve mechanism disposed in the exhaust channel between the connection points of the exhaust channel to switch a pathway for exhaust gas from the exhaust channel to the bypass channel. The first sensor detects a property indicative of an air-fuel ratio of exhaust flowing in the exhaust channel at a point downstream of the valve mechanism. The controller adjusts an element temperature of the first sensor to a prescribed temperature or less during a prescribed interval of time from when the valve mechanism is switched from a closed state to an open state.Type: ApplicationFiled: December 20, 2007Publication date: July 17, 2008Applicant: NISSAN MOTOR CO., LTD.Inventors: Yoshiyuki OOTAKE, Yasuji ISHIZUKA, Masaki KOGA, Kenichi SATO
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Patent number: 7121086Abstract: Sulphur oxides in the exhaust gas of a vehicle engine (1) are trapped by a nitrogen oxide trapping catalyst (5A). A controller (6) calculates the sulphur oxide poisoning amount of the trapping catalyst (5A) from the running condition of the vehicle (S13), and desulphating the sulphur oxides by a removing mechanism (3, 4, 14). The release amount of sulphur oxides per unit time due to desulphating is set as a parameter based on the sulphur oxide poisoning amount (S11), and by integrating the calculated release amount using the parameter, the current poisoning amount is calculated, and the release completion timing is precisely found.Type: GrantFiled: June 5, 2002Date of Patent: October 17, 2006Assignee: Nissan Motor Co., Ltd.Inventors: Satoshi Nishii, Kenichi Sato, Yasuji Ishizuka
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Patent number: 6766640Abstract: A first catalyst 21 which stores or releases oxygen according to an air-fuel ratio, and a second catalyst 22 which traps or releases NOx according to the air-fuel ratio, are provided in an exhaust passage 9 of an engine 1. A controller 6 temporarily shifts the air-fuel ratio of the engine 1 to rich when it is determined that the NOx trap catalyst second catalyst 22 is released. At this time, the controller 6 increases a reducing agent supply amount due to the rich shift to be larger, the larger the oxygen amount stored by the two catalysts 21, 22. In this way, the air-fuel ratio in the second catalyst 22 is maintained at a target stoichiometric or rich air-fuel ratio.Type: GrantFiled: August 20, 2001Date of Patent: July 27, 2004Assignee: Nissan Motor Co., Ltd.Inventors: Yasuji Ishizuka, Hideaki Takahashi, Yoshiaki Yoshioka
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Publication number: 20020192125Abstract: Sulphur oxides in the exhaust gas of a vehicle engine (1) are trapped by a nitrogen oxide trapping catalyst (5A). A controller (6) calculates the sulphur oxide poisoning amount of the trapping catalyst (5A) from the running condition of the vehicle (S13), and desulphating the sulphur oxides by a removing mechanism (3, 4, 14). The release amount of sulphur oxides per unit time due to desulphating is set as a parameter based on the sulphur oxide poisoning amount (S11), and by integrating the calculated release amount using the parameter, the current poisoning amount is calculated, and the release completion timing is precisely found.Type: ApplicationFiled: June 5, 2002Publication date: December 19, 2002Applicant: NISSAN MOTOR CO., LTD.Inventors: Satoshi Nishii, Kenichi Sato, Yasuji Ishizuka
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Publication number: 20020023432Abstract: A first catalyst 21 which stores or releases oxygen according to an air-fuel ratio, and a second catalyst 22 which traps or releases NOx according to the air-fuel ratio, are provided in an exhaust passage 9 of an engine 1. A controller 6 temporarily shifts the air-fuel ratio of the engine 1 to rich when it is determined that the NOx trap catalyst second catalyst 22 is released. At this time, the controller 6 increases a reducing agent supply amount due to the rich shift to be larger, the larger the oxygen amount stored by the two catalysts 21, 22. In this way, the air-fuel ratio in the second catalyst 22 is maintained at a target stoichiometric or rich air-fuel ratio.Type: ApplicationFiled: August 20, 2001Publication date: February 28, 2002Applicant: NISSAN MOTOR CO., LTD.Inventors: Yasuji Ishizuka, Hideaki Takahashi, Yoshiaki Yoshioka
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Patent number: 6263666Abstract: An exhaust emission control device of an engine 1 comprises an NOx storage catalyst 9 which traps and stores NOx in exhaust gas and reduces the stored NOx according to an air fuel ratio of inflowing exhaust gas. A controller 6 determines conditions for discharging the SOx stored in the catalyst 9. When SOx discharge conditions are satisfied and the engine running conditions are in a predetermined SOx discharge running region, the controller 6 performs SOx discharge control of the catalyst 9. As lean air fuel ratio control is prohibited from when SOx discharge conditions are satisfied to when SOx discharge is complete, lean air fuel ratio control is prevented from taking place when the NOx trapping capacity of the catalyst 9 is insufficient, and increase of exhaust emission is thereby prevented.Type: GrantFiled: March 16, 2000Date of Patent: July 24, 2001Assignee: Nissan Motor Co., Ltd.Inventors: Kengo Kubo, Yasuji Ishizuka, Kimiyoshi Nishizawa
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Patent number: 6185929Abstract: An exhaust emission control system for an internal combustion engine amounted on an automotive vehicle. The exhaust emission control system comprises a first catalyst disposed in an exhaust gas passage of the engine. The first catalyst functions to store NOx in an atmosphere having an air-fuel ratio leaner than a stoichiometric level and to release NOx in an atmosphere having an air-fuel ratio ocher than the stoichiometric level and reduce released NOx in presence of HC and CO. A second catalyst is disposed in the exhaust gas passage upstream of the first catalyst and having an oxygen absorbing ability.Type: GrantFiled: January 14, 1999Date of Patent: February 13, 2001Assignee: Nissan Motor Co., Ltd.Inventors: Yasuji Ishizuka, Kimiyoshi Nishizawa
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Patent number: 6116023Abstract: For proper treatment of NOx released from NOx absorbent catalyst as well as HC and CO in exhaust gas, a measure of A/F of exhaust gas downstream of the NOx absorbent is used as the input to a feedback control loop. The feedback control loop alters a feedback correction factor (or coefficient) of a fuel control command applied to each fuel injector in such a direction to decrease a deviation of the actual A/F input from a target A/F (stoichiometry or rich) When the measure of A/F has switched the side to rich, a measure of A/F of exhaust gas upstream of the NOx absorbent catalyst is used as the input to perform usual feedback control loop to maintain lean combustion mode.Type: GrantFiled: June 9, 1998Date of Patent: September 12, 2000Assignee: Nissan Motor Co., Ltd.Inventors: Yasuji Ishizuka, Kimiyoshi Nishizawa
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Patent number: 6101809Abstract: To optimally operate a NOx-occluded type catalytic converter installed in an exhaust passage of an internal combustion engine, there are employed an air/fuel ratio sensor for detecting an exhaust air/fuel ratio of the exhaust gas downstream of the converter; and a control device for controlling an air/fuel ratio of a combustible mixture fed to the engine. The control device comprises a first section for causing the converter to effect NOx-reduction treatment by making the air/fuel ratio of the combustible mixture richer and/or stoichiometric; and a second section for learning and correcting the condition of the NOx-reduction treatment, based on the exhaust air/fuel ratio detected by the sensor under the NOx-reduction treatment.Type: GrantFiled: August 21, 1998Date of Patent: August 15, 2000Assignee: Nissan Motor Co., Ltd.Inventors: Yasuji Ishizuka, Kimiyoshi Nishizawa
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Patent number: 6050086Abstract: An exhaust emission control apparatus for an internal combustion engine includes an electrically-heated catalytic converter and a secondary air supply device. The converter is electrically heated with a predetermined delay after the secondary air supply device starts supplying fresh air to exhaust gases of the engine. This prevents the increase of an intake air flow due to the no-delay electric heating of the converter, and therefore the thermal reactor effect of the secondary air supply device is ensured.Type: GrantFiled: February 20, 1998Date of Patent: April 18, 2000Assignee: Nissan Motor Co., Ltd.Inventors: Yasuji Ishizuka, Takashi Yamada