公开(公告)号：US10167760B2

公开(公告)日：2019-01-01

申请号：US15110427

申请日：2014-12-18

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yuji Yamaguchi ,  Norihisa Nakagawa ,  Shuntaro Okazaki ,  Yuji Miyoshi

IPC: F01N3/20 ,  F02D41/14 ,  F02D35/00 ,  F02D41/02

Abstract: An internal combustion engine comprises an exhaust purification catalyst. The control system comprises a temperature detecting means for detecting or estimating a temperature of the exhaust purification catalyst, performs feedback control so that an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst becomes a target air-fuel ratio, and performs target air-fuel ratio setting control which alternately sets the target air-fuel ratio to a rich set air-fuel ratio and a lean set air-fuel ratio. In addition, the control system increases a variation difference, obtained by subtracting a rich degree of the rich set air-fuel ratio from a lean degree of a lean set air-fuel ratio, when a temperature of the exhaust purification catalyst detected or estimated by the temperature detecting means is a predetermined upper limit temperature or less compared with when it is higher than the upper limit temperature. As a result, a sulfur ingredient storage amount of an exhaust purification catalyst is maintained low.

公开(公告)号：US10151262B2

公开(公告)日：2018-12-11

申请号：US15038133

申请日：2014-11-20

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Hiroshi Miyamoto ,  Yasushi Iwazaki ,  Toru Kidokoro ,  Yuji Miyoshi

IPC: F02D41/14 ,  F02D41/12 ,  F02D41/22

Abstract: An internal combustion engine comprises an exhaust purification catalyst arranged in an exhaust passage of the internal combustion engine; an upstream side air-fuel ratio sensor for detecting an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst; and a downstream side air-fuel ratio sensor for detecting an air-fuel ratio of exhaust gas flowing out from the exhaust purification catalyst. An abnormality diagnosis system of air-fuel ratio sensors judges that at least one of the air-fuel ratio sensors has become abnormal when a difference or ratio between an output value of said upstream side air-fuel ratio sensor and an output value of said downstream side air-fuel ratio sensor becomes outside a predetermined range of normal difference or predetermined range of normal ratio during atmospheric gas introduction control where the exhaust gas flowing into the exhaust purification catalyst becomes atmospheric gas.

公开(公告)号：US09863354B2

公开(公告)日：2018-01-09

申请号：US15083378

申请日：2016-03-29

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Shuntaro Okazaki ,  Kenji Suzuki ,  Hiroshi Miyamoto ,  Yuji Miyoshi

IPC: F01N11/00 ,  F02D41/14 ,  F02D41/02 ,  F02D41/22 ,  F01N3/10 ,  F01N13/00

CPC classification number: F02D41/1495 ,  F01N3/101 ,  F01N11/007 ,  F01N13/0093 ,  F01N2550/00 ,  F01N2560/025 ,  F01N2610/03 ,  F01N2900/0408 ,  F01N2900/0416 ,  F01N2900/0418 ,  F01N2900/1402 ,  F01N2900/1624 ,  F02D41/0295 ,  F02D41/1408 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1456 ,  F02D41/1475 ,  F02D41/222 ,  F02D2200/0814 ,  F02D2200/0816 ,  Y02T10/22 ,  Y02T10/47

Abstract: An exhaust purification system comprises an exhaust purification catalyst, a downstream side air-fuel ratio sensor and a control device. The control device makes the air-fuel ratio of the exhaust gas change to an air-fuel ratio at a rich side from the prior air-fuel ratio as air-fuel ratio rich increasing control when the air-fuel ratio of the exhaust gas is made a rich air-fuel ratio and the output air-fuel ratio of the downstream side air-fuel ratio sensor is maintained at a lean judged air-fuel ratio or more, and judges that the downstream side air-fuel ratio sensor suffers from an abnormality, when, due to the air-fuel ratio rich increasing control, the air-fuel ratio of the exhaust gas is made to change to the rich side air-fuel ratio and the output air-fuel ratio of the downstream side air-fuel ratio sensor changes to the lean side.

公开(公告)号：US09835104B2

公开(公告)日：2017-12-05

申请号：US15083449

申请日：2016-03-29

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Shuntaro Okazaki ,  Kenji Suzuki ,  Hiroshi Miyamoto ,  Yuji Miyoshi

IPC: F01N11/00 ,  F02D41/14 ,  F01N3/10 ,  F01N13/00 ,  F02D41/24 ,  F02D41/02

CPC classification number: F02D41/1495 ,  F01N3/101 ,  F01N11/007 ,  F01N13/008 ,  F01N2550/00 ,  F01N2560/025 ,  F01N2610/03 ,  F01N2900/0408 ,  F01N2900/0416 ,  F01N2900/0418 ,  F01N2900/1402 ,  F01N2900/1624 ,  F02D41/0235 ,  F02D41/1408 ,  F02D41/1439 ,  F02D41/1454 ,  F02D41/1456 ,  F02D41/1475 ,  F02D41/2454 ,  F02D2200/0814 ,  Y02T10/47

Abstract: An exhaust purification system comprising an exhaust purification catalyst, a downstream side air-fuel ratio sensor, and a control device performing air-fuel ratio control for controlling an air-fuel ratio of exhaust gas and abnormality diagnosis control for diagnosing the downstream side air-fuel ratio sensor. In the air-fuel ratio control, the control device alternately and repeatedly switches the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst between a rich air-fuel ratio and a lean air-fuel ratio. In the abnormality diagnosis control, the control device judges that the downstream side air-fuel ratio sensor has become abnormal when the air-fuel ratio of the exhaust gas is made the rich air-fuel ratio by the air-fuel control and the output air-fuel ratio of the downstream side air-fuel ratio sensor changes from an air-fuel ratio richer than a predetermined lean judged air-fuel ratio to an lean air-fuel ratio.

公开(公告)号：US20170335777A1

公开(公告)日：2017-11-23

申请号：US15591839

申请日：2017-05-10

Applicant: Toyota Jidosha Kabushiki Kaisha

Inventor： Yuji Yamaguchi ,  Hirokazu Ito ,  Yuji Miyoshi

IPC: F02D9/02 ,  F02D41/02 ,  F02D41/00 ,  F02D41/26

CPC classification number: F02D9/02 ,  F02D41/0002 ,  F02D41/005 ,  F02D41/0077 ,  F02D41/024 ,  F02D41/0255 ,  F02D41/26 ,  F02D2009/0272 ,  F02D2041/0017 ,  F02D2200/1002 ,  Y02T10/26 ,  Y02T10/42 ,  Y02T10/47

Abstract: An object is to supply fresh air and EGR gas into a cylinder in good balance according to the required load in a naturally aspirated gasoline engine. When the operation state of the engine falls in a low load range, a control apparatus adjusts the degree of opening of the second throttle while keeping the first throttle fully open and controls EGR gas quantity by adjusting the degree of opening of the EGR valve. When the operation state falls in a middle load range, the apparatus controls EGR gas quantity by adjusting the degree of opening of the first throttle while keeping the EGR valve fully open. When the operation state falls in a high load range, the apparatus adjusts the degree of opening of the first throttle while keeping the second throttle fully open and controls EGR gas quantity by adjusting the degree of opening of the EGR valve.

公开(公告)号：US09759120B2

公开(公告)日：2017-09-12

申请号：US15092803

申请日：2016-04-07

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Yoshihiro Furuya ,  Yuji Miyoshi ,  Satoko Tofukuji ,  Nobuki Kawamoto ,  Daishi Takahashi

IPC: F01P7/14 ,  F02F1/10 ,  F02B29/04 ,  F01P7/16 ,  F01P11/16

CPC classification number: F01P7/14 ,  F01P7/165 ,  F01P11/16 ,  F01P2007/146 ,  F01P2025/42 ,  F01P2060/02 ,  F02B29/0443 ,  F02B29/0493 ,  F02F1/10 ,  Y02T10/146

Abstract: High temperature (HT) and low temperature (LT) cooling water, the LT cooling water being at a lower temperature than the HT cooling water, circulate in HT and LT cooling water flows in respective channels. A controller controls to set the temperature of the LT cooling water lower in a case where an operating point of an engine lies in a particular region in an operational region of the engine, the particular region including a region in which the load is high and the engine speed is low, than in a case where the operating point lies in an operational region other than the particular region. Furthermore, the controller narrows the particular region in a direction toward higher loads in a case where the temperature of the HT cooling water is lower than a predetermined temperature.

公开(公告)号：US09726101B2

公开(公告)日：2017-08-08

申请号：US15066140

申请日：2016-03-10

Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA

Inventor： Kazuya Suzuki ,  Yuji Yamaguchi ,  Hiroyuki Hokuto ,  Yuji Miyoshi ,  Koichi Hoshi

IPC: F01N3/20 ,  F02D41/24 ,  F01N3/10 ,  F01N11/00 ,  F02D41/02 ,  F02D41/14 ,  F02D41/00

CPC classification number: F02D41/2461 ,  F01N3/10 ,  F01N11/007 ,  F01N2550/02 ,  F01N2560/025 ,  F02D41/008 ,  F02D41/025 ,  F02D41/0295 ,  F02D41/1408 ,  F02D41/1441 ,  F02D41/1454 ,  F02D41/1475 ,  F02D2200/0814 ,  Y02T10/26

Abstract: An exhaust purification system of an internal combustion engine which has a plurality of cylinders is comprised of an exhaust purification catalyst, a downstream side air-fuel ratio sensor, and a control device which controls the average air-fuel ratio of the exhaust gas and the combustion air-fuel ratios of the cylinders. The control device performs average air-fuel ratio control where it alternately controls the average air-fuel ratio between the rich air-fuel ratio and the lean air-fuel ratio and inter-cylinder air-fuel ratio control where it controls the combustion air-fuel ratios of the cylinders so that the combustion air-fuel ratio becomes the rich air-fuel ratio at least at one cylinder among the plurality of cylinders even when the average air-fuel ratio is controlled to the lean air-fuel ratio by average air-fuel ratio control. In average air-fuel ratio control, the average air-fuel ratio is controlled so that the lean shift amount when controlling the average air-fuel ratio to the lean air-fuel ratio becomes smaller than the rich shift amount when controlling the average air-fuel ratio to the rich air-fuel ratio.