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公开(公告)号：US10254241B2
公开(公告)日：2019-04-09
申请号：US15286964
申请日：2016-10-06
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keiichiro Aoki , Koji Ide , Yoshihisa Serizawa
IPC: G01N27/407 , G01N27/406 , G01N27/417 , G01N27/419 , G01N33/00
Abstract: A multiple gas detection device comprises: a first cell part provided with a first electrochemical cell; a second cell part provided with a second electrochemical cell; a third cell part provided with a third electrochemical cell; an inlet diffusion controller controlling diffusion of measured gas; and a measured gas chamber into which the measured gas flows through the inlet diffusion controller. The first cell part is configured to selectively detect a concentration of NOx or ammonia contained in measured gas in the measured gas chamber. The second cell part is configured to discharge oxygen contained in measured gas in the measured gas chamber and convert NO2 and ammonia contained in measured gas in the measured gas chamber to NO. The third cell part is configured to detect a concentration of NO contained in measured gas in the measured gas chamber.
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公开(公告)号：US10180098B2
公开(公告)日：2019-01-15
申请号：US15587390
申请日：2017-05-04
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keiichiro Aoki , Koji Ide , Go Hayashita
Abstract: A control device of an exhaust sensor comprises a battery voltage detection part detecting a voltage of a battery, and a heater control part setting a target temperature of an electrochemical cell and controlling the electric power supplied from the battery to a heater. The heater control part sets the target temperature to a first temperature after startup of the internal combustion engine until the voltage of the battery recovers to a predetermined voltage, and switches the target temperature from the first temperature to a second temperature when the voltage of the battery recovers to the predetermined voltage. The first temperature is a temperature lower than an operating temperature of the electrochemical cell and at least a lowest temperature at which a Leidenfrost phenomenon occurs at the protective layer. The second temperature is a temperature of the operating temperature or more.
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公开(公告)号：US09982614B2
公开(公告)日：2018-05-29
申请号：US15200581
申请日：2016-07-01
Applicant: Toyota Jidosha Kabushiki Kaisha
Inventor： Go Hayashita , Koji Ide
IPC: F02D41/00 , F02D41/14 , F02D41/06 , F01N3/10 , F02D35/00 , F02D41/26 , F02D41/02 , F01N9/00 , F01N11/00
CPC classification number: F02D41/1494 , F01N3/101 , F01N9/00 , F01N11/007 , F01N2430/06 , F01N2560/025 , F01N2560/14 , F01N2560/20 , F01N2900/08 , F02D35/0015 , F02D41/0295 , F02D41/065 , F02D41/1441 , F02D41/1454 , F02D41/26 , F02D2041/1418 , F02D2200/0814 , Y02T10/22
Abstract: A control device for an internal combustion engine comprises an air-fuel ratio control part configured to control the air-fuel ratio of the exhaust gas and a heating control part configured to control the heating of the air-fuel ratio sensors. The heating control part controls the sensor heaters so that the temperature of the upstream air-fuel ratio sensor becomes less than the activation temperature and so that the temperature of the downstream air-fuel ratio sensor becomes the activation temperature or more while the internal combustion engine is stopped by the automatic stop function. The air-fuel ratio control part controls the exhaust air-fuel ratio based on the outputs of the two air-fuel ratio sensors during engine operation and control the air-fuel ratio temporarily based on only the output of the downstream air-fuel ratio sensor after the internal combustion engine has been restarted after automatic stop.
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公开(公告)号：US09932879B2
公开(公告)日：2018-04-03
申请号：US15190224
申请日：2016-06-23
Applicant: Toyota Jidosha Kabushiki Kaisha
Inventor： Go Hayashita , Koji Ide
CPC classification number: F01N11/007 , F01N3/101 , F01N9/00 , F01N2430/06 , F01N2560/025 , F01N2560/06 , F01N2560/14 , F01N2560/20 , F01N2590/11 , F01N2900/0416 , F01N2900/1402 , Y02T10/22 , Y02T10/47
Abstract: An automatically stoppable internal combustion engine comprises an exhaust purification catalyst, an upstream side air-fuel ratio sensor, a downstream side air-fuel ratio sensor, and sensor heaters heating air-fuel ratio sensors. A controller comprises an air-fuel ratio control part and a heating control part. The heating control part controls the temperature of the upstream side air-fuel ratio sensor to the activation temperature or more and the temperature of the downstream side air-fuel ratio sensor to less than the activation temperature during automatic stop of the internal combustion engine. The air-fuel ratio control part controls the air-fuel ratio of the exhaust gas based on the outputs of the two air-fuel ratio sensors during engine operation and controls the air-fuel ratio of the exhaust gas temporarily based on the output of the upstream side air-fuel ratio sensor without using the output of the downstream side air-fuel ratio sensor.
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公开(公告)号：US09803577B2
公开(公告)日：2017-10-31
申请号：US15058272
申请日：2016-03-02
Applicant: Toyota Jidosha Kabushiki Kaisha
Inventor： Koji Ide , Keiichiro Aoki , Go Hayashita
CPC classification number: F02D41/1494 , F02B77/086 , F02D41/1454 , F02D41/1495 , F02D41/222 , F02D41/2403 , F02D41/401 , Y02T10/44
Abstract: In automatic stopping of the internal combustion engine, an electronic control unit controls a heater so that an element temperature of the air-fuel ratio sensor becomes a first temperature. The first temperature is a temperature that is below an activation temperature range in which the air-fuel ratio sensor is activated, and is also below a desorption temperature range in which HC components adsorbed on the air-fuel ratio sensor desorb therefrom. In a case where, after the element temperature of the air-fuel ratio sensor becomes the first temperature, it is estimated that the amount of HC components adsorbed on the air-fuel ratio sensor increases to exceed a first predetermined amount, the electronic control unit controls the heater so that the element temperature of the air-fuel ratio sensor becomes a second temperature. The second temperature is a temperature included in the desorption temperature range.
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Patent Agency Ranking
公开(公告)号：US10753297B2
公开(公告)日：2020-08-25
申请号：US15620013
申请日：2017-06-12
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Go Hayashita , Koji Ide , Yasushi Ono
IPC: F02D41/14 , F02D41/22 , G01N27/406 , F02D41/20 , G01N27/417 , F02D35/00 , F02D41/24
Abstract: A control device of an exhaust sensor comprises a heater control part configured to set a target temperature of an electrochemical cell and control a heater so that a temperature of the electrochemical cell becomes the target temperature, and a judging part configured to judge whether a water repellency of a protective layer is falling when the heater control part sets the target temperature to a temperature of a lowest temperature at which a Leidenfrost phenomenon occurs at an outer surface of the protective layer or more. The heater control part is configured to rise the target temperature when the judging part judges that the water repellency of the protective layer is falling.
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公开(公告)号：US10288001B2
公开(公告)日：2019-05-14
申请号：US15868578
申请日：2018-01-11
Applicant: Toyota Jidosha Kabushiki Kaisha
Inventor： Yasushi Ono , Keiichiro Aoki , Koji Ide , Go Hayashita
Abstract: The control system of an internal combustion engine controls an internal combustion engine comprising an exhaust sensor. The control system comprises a motoring device driving rotation of a crankshaft of the internal combustion engine, a motoring control part configured to control the motoring device, a heater control part configured to control supply of electric power to the heater, and a temperature estimating part configured to estimate a temperature of the sensor element. The motoring control part is configured to drive the motoring device for a predetermined time when the temperature of the sensor element estimated by the temperature estimating part is outside a predetermined cracked element temperature region while the heater control part is supplying electric power to the heater, and stop driving the motoring device when the temperature of the sensor element is within the cracked element temperature region.
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公开(公告)号：US10006394B2
公开(公告)日：2018-06-26
申请号：US15325221
申请日：2015-07-21
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Go Hayashita , Hidenori Moriya , Koji Ide
CPC classification number: F02D41/2454 , F01N3/101 , F01N11/00 , F01N11/007 , F01N2550/00 , F01N2550/02 , F01N2900/1402 , F01N2900/1624 , F02D41/0295 , F02D41/1402 , F02D41/1441 , F02D41/1456 , F02D41/1495 , F02D41/2441 , F02D2041/1418 , F02D2200/0814 , Y02T10/22 , Y02T10/47
Abstract: Downstream side air-fuel ratio sensor signal based adaptive air-fuel ratio control. When the air-fuel ratio detected by the downstream side air-fuel ratio sensor is maintained lean unduly, a stuck learning control is performed to decrease a learning value to lower the air-fuel ratio. Adaptive learning value update control is performed based on the downstream side air-fuel ratio sensor signal to increase the learning value when an upstream air-fuel ratio deviates to the rich side and to decrease the learning value when the upstream air-fuel ratio deviates to the lean side. It is judged that the downstream side air-fuel ratio sensor is abnormal when a certain value or more of decrease of the learning value and a certain value or more of increase of the learning value are repeated.
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公开(公告)号：US09903292B2
公开(公告)日：2018-02-27
申请号：US14921198
申请日：2015-10-23
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Hiroshi Miyamoto , Toru Kidokoro , Yasushi Iwazaki , Kenji Suzuki , Koji Ide
CPC classification number: F02D41/1495 , F02D41/1441 , F02D41/1454 , F02D41/1494 , F02D41/222 , Y02T10/40
Abstract: An abnormality diagnosis system of limit current type air-fuel ratio sensors comprises a current detecting part and a sensor temperature control device. The abnormality diagnosis system uses the current detecting part to detect the output current of the air-fuel ratio sensor when the air-fuel ratio is made the rich air-fuel ratio in the state where temperature of the air-fuel ratio is made the first temperature and when the air-fuel ratio is made the rich air-fuel ratio in the state where the temperature of the air-fuel ratio is made a second temperature higher than the first temperature. It is judged that the air-fuel ratio sensor is abnormal if the output current when the temperature of the air-fuel ratio sensor is the first temperature is larger than the output current when it is the second temperature by a predetermined value or more.
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公开(公告)号：US10184913B2
公开(公告)日：2019-01-22
申请号：US15082032
申请日：2016-03-28
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keiichiro Aoki , Koji Ide , Go Hayashita , Toyoharu Kaneko , Tatsuhiro Hashida , Kazuhiro Wakao
IPC: G01N27/407 , G01N27/417 , G01N33/00 , F02D41/14 , F02D41/22 , F01N11/00 , G01N27/406 , G01N27/419
Abstract: In a limited-current type gas sensor which detects oxygen-containing gas contained in an exhaust gas of an internal combustion engine, the decomposition current value of water (H2O) may be detected, and existence of an abnormality of output characteristics of the sensor may be diagnosed based on its deviation from a reference decomposition current value of water corresponding to the concentration of water contained in the exhaust gas. A NOx sensor and a SOx sensor can also diagnose remarkable and minute abnormalities of output characteristics. In addition, the reference decomposition current value of water may be acquired based on the concentration of water detected by a separate humidity sensor or the decomposition current value of oxygen detected by the limited-current type gas sensor. The reference decomposition current value of water may be corrected based on a decomposition current value of oxygen detected during a fuel cut.
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