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公开(公告)号：JP2002089350A
公开(公告)日：2002-03-27
申请号：JP2000272185
申请日：2000-09-07
Applicant: TOYOTA MOTOR CORP
Inventor： MAGATA HISAFUMI , MATSUSHITA SOICHI , OKI HISASHI , HAYASHI KOTARO , ISHIYAMA SHINOBU , KOBAYASHI MASAAKI , SHIBATA DAISUKE , ODA TOMIHISA , HARADA YASUO , NEGAMI AKIHIKO , MATSUOKA HIROKI , OTSUBO YASUHIKO , AOYAMA TARO , TAWARA ATSUSHI
Abstract: PROBLEM TO BE SOLVED: To make possible proper feedback-control of an air-fuel ratio in an exhaust emission control device for an internal combustion engine and to prevent deterioration of exhaust gas emission by providing technology capable of correcting an output value of an air-fuel ratio sensor provided in an exhaust gas passage. SOLUTION: This exhaust emission control device is furnished with the lean combustion type internal combustion engine 1, an NOX catalyst 20 provided in the exhaust gas passage 19 of the internal combustion engine 1, an NOX purification control means 35 to carry out NOX purifying treatment to discharge and reduce nitrogen oxides absorbed in the NOX catalyst 20, a poisoning cancelling treatment to cancel poisoning by the oxides of the NOX catalyst 20, an air-fuel ratio measuring means 23 provided in the exhaust air passage 19 and to measure the air-fuel ratio of exhaust air and an air-fuel ratio correction means 35 to correct an output signal of the air-fuel ratio measuring means 23 thereafter in accordance with the output signal of the air-fuel ratio measuring means 23 in the middle of practicing the poisoning cancelling treatment.
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公开(公告)号：JP2001336416A
公开(公告)日：2001-12-07
申请号：JP2000153746
申请日：2000-05-24
Applicant: TOYOTA MOTOR CORP
Inventor： ISHIYAMA SHINOBU , TAWARA ATSUSHI , SHIBATA DAISUKE , MATSUSHITA SOICHI , TSUKASAKI YUKIHIRO , HAYASHI KOTARO , OBA TAKAHIRO , NEGAMI AKIHIKO
Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control device which can surely recover an ecclusion reduction type NOX catalyst from SOX poisoning, and also to suppress degradation of fuel consumption during recovering from the poisoning. SOLUTION: An NOX catalyst 17 is arranged in an intermediate portion of an exhaust pipe. A fuel-adding nozzle 21 for adding fuel into the exhaust gas during recovering from the SOX poisoning is arranged at a just upstream position of the NOX catalyst 17. An exhaust pipe 16 at the downstream portion of the NOX catalyst 17 is coupled to an EGR pipe 26 via a bypass pipe 29. A flow control valve 30 is arranged in the bypass pipe 29. During recovering from the SOX poisoning, the flow control valve is opened to introduce part of the exhaust gas flowing in the EGR pipe 26 to an exhaust confluent pipe 31 via the bypass pipe 29 by bypassing the fuel-adding nozzle 21 and the NOX catalyst 17. Thus, amount of exhaust gas passing the NOX catalyst 17 is reduced. The exhaust confluent pipe 31 is provided with an oxidation catalyst 19.
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公开(公告)号：JP2001227325A
公开(公告)日：2001-08-24
申请号：JP2000035733
申请日：2000-02-14
Applicant: TOYOTA MOTOR CORP
Inventor： SHIBATA DAISUKE , MATSUSHITA SOICHI , ISHIYAMA SHINOBU , TAWARA ATSUSHI
Abstract: PROBLEM TO BE SOLVED: To estimate catalyst floor temperature of a lean NOx catalyst. SOLUTION: A DPF 18 is provided in the middle of an exhaust pipe 14 of a diesel engine 1, and an occlusion reduction type NOx catalyst is borne on this DPF 18. An addition nozzle 21 is provided on the upstream of the DPF 18, and fuel as a reducer is supplied to the NOx catalyst borne by the DPF 18 from the addition nozzle 21. An ECU 9 estimates catalyst floor temperature of the NOx catalyst in consideration of a calorific value at the time when fuel added from the addition nozzle 21, and HC, CO in the exhaust gas react with the NOx catalyst.
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公开(公告)号：JP2000257419A
公开(公告)日：2000-09-19
申请号：JP5555499
申请日：1999-03-03
Applicant: TOYOTA MOTOR CORP
Inventor： YANAGIHARA HIROMICHI , TSUKASAKI YUKIHIRO , ISHIYAMA SHINOBU , KOBAYASHI MASAAKI , TAWARA ATSUSHI
Abstract: PROBLEM TO BE SOLVED: To attain high NOX purification efficiency without adjusting exhaust to a rich air-fuel ratio by generating a low temperature oxidation reaction after supplying reductant, while retaining exhaust purification catalyst in a prescribed temperature range, and continuously producing reaction activated substance such that combustion exhaust at a specified air excess ratio is supplied. SOLUTION: A reductant supply device 20 for supplying liquid reductant is provided upstream of exhaust purification catalyst (RAP catalyst) 10 disposed in an exhaust passage 3. The RAP catalyst is obtained by carrying oxidized catalyst components, such as Pt and Pd on the multi-porous zeolite. A combustion state in an engine 1 is adjusted, such that an excess air ratio of the combustion exhaust flowing through the exhaust passage 3 becomes 1.0 or more. The flow rate of the reductant injected from a nozzle 23 is controlled by adjusting an opening degree of a control valve 25 in a control device 30. Furthermore, by allowing the exhaust temperature and excess air ratio to be within the range where a low-temperature oxidation reaction takes place on the catalyst, the reductant is converted into a radical and reacts preferentially with NOX in the exhaust, realizing high purification efficiency.
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公开(公告)号：JP2000179326A
公开(公告)日：2000-06-27
申请号：JP35317798
申请日：1998-12-11
Applicant: TOYOTA MOTOR CORP
Inventor： TAWARA ATSUSHI , SUGIYAMA TOSHIHISA
Abstract: PROBLEM TO BE SOLVED: To accurately control engine exhaust temperature within a short period of time to a target level during particulate filter reclamation processes. SOLUTION: A particulate filter (DPE) 40 is placed at each of the exhaust ports of all cylinders of a diesel engine 1. An electronic control unit(ECU) 30 of the engine increases exhaust temperature to perform reclamation of DPFs by using any one or more of the following methods: exhaust throttling operation by means of an exhaust throttle valve 37; expansion stroke injection operation in which fuel is injected during an expansion stroke of each cylinder; EGR operation; and, main fuel injection control operation in which the amount of main fuel injected and injection timing for each cylinder are changed. When performing the exhaust throttling operation, the ECU sets a value depending on engine operating conditions for each control amount of the amount of fuel injected during the expansion stroke and injection timing, recirculating exhaust flow rate, and the amount of main fuel injected and injection timing, each different from those when the exhaust throttling operation is not performed.
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Patent Agency Ranking
公开(公告)号：JP2000170527A
公开(公告)日：2000-06-20
申请号：JP34405898
申请日：1998-12-03
Applicant: TOYOTA MOTOR CORP
Inventor： SUGIYAMA TOSHIHISA , TAWARA ATSUSHI
Abstract: PROBLEM TO BE SOLVED: To accurately estimate the NOx absorbing amount of an NOx storage reducing catalyst. SOLUTION: An NOx storage reducing catalyst 70 is disposed in the exhaust passage 3 of an engine 1 to absorb NOx in exhaust gas during the lean air-fuel ratio running of the engine. An electronic control unit(ECU) 30 calculates an NOx quantity discharged from the engine per unit time based on engine load conditions (fuel injection amount, and revolution number), and calculates an NOx quantity absorbed by the NOx storage reducing catalyst per unit time by multiplying the NOx quantity by a specified coefficient. The ECU 30 calculates an NOx quantity absorbed in the NOx storage reducing catalyst by integrating the quantities of absorption per unit time. When an EGR is stopped at the time of a low engine temperature, the ECU 30 increases and corrects an absorbing quantity per unit time matching the quantity of generated NOx following the EGR stop. Thus, irrespective of EGR execution, the NOx absorbing quantity of the NOx storage reducing catalyst is accurately estimated.
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公开(公告)号：JP2000145435A
公开(公告)日：2000-05-26
申请号：JP32377998
申请日：1998-11-13
Applicant: TOYOTA MOTOR CORP
Inventor： SUGIYAMA TOSHIHISA , TAWARA ATSUSHI
Abstract: PROBLEM TO BE SOLVED: To prevent NOx from flowing out of an NOx absorbent. SOLUTION: An NOx absorbent, which absorbs NOx when the air-fuel ratio of an inflowing exhaust gas is lean and discharges NOx when the oxygen concentration of the inflowing exhaust gas decreases, is installed in an exhaust path. A reducing agent supply nozzle is installed in the exhaust path upstream of the NOx absorbent. If the amount of NOx absorbed SN by the NOx absorbent is larger than a set amount SN1 when an NOx absorbent temperature TNA exceeds a threshold temperature T1, the amount of reducing agent supplied qR by the reducing agent supply nozzle is temporarily set to qN so that NOx contained in the NOx absorbent can be discharged and reduced. If TNA becomes lower than T1 while a reducing agent supply sequence is being carried out to discharge and reduce NOx, qR is temporarily set to qC so that the reducing agent can be temporarily stored in the NOx absorbent. When the NOx absorbent temperature rises, the reducing agent stored in the NOx absorbent desorbs from the NOx absorbent to reduce NOx in the NOx absorbent.
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公开(公告)号：JP2000145434A
公开(公告)日：2000-05-26
申请号：JP32370898
申请日：1998-11-13
Applicant: TOYOTA MOTOR CORP
Inventor： TAWARA ATSUSHI , SUGIYAMA TOSHIHISA
Abstract: PROBLEM TO BE SOLVED: To supply an exhaust emission catalyst with a uniform volume of a reducing agent in its radial direction. SOLUTION: An NOx absorbent 17, which absorbs NOx when the air-fuel ratio of an inflowing exhaust gas is lean and discharges the absorbed NOx when the oxygen concentration of the inflowing exhaust decreases, is installed in an exhaust path of an engine. An oxidation catalyst 16 is installed in the exhaust path upstream of the NOx absorbent 17. To discharge and reduce NOx contained in the NOx absorbent 17, a reducing agent injection nozzle 21 that supplies the NOx absorbent 17 with a reducing agent is located in the exhaust path upstream from the oxidation catalyst 16. A microporous body 24 is mounted at the tip of the reducing agent injection nozzle 21. The reducing agent injected from the reducing agent injection nozzle 21 seeps through an entire peripheral surface of the microporous body 24, being supplied evenly in a radial direction.
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公开(公告)号：JP2012219772A
公开(公告)日：2012-11-12
申请号：JP2011089167
申请日：2011-04-13
Applicant: Toyota Motor Corp , トヨタ自動車株式会社
Inventor： TAWARA ATSUSHI
Abstract: PROBLEM TO BE SOLVED: To provide a rotation speed control device of an internal combustion engine capable of accurately performing abnormality detention of idle control.SOLUTION: A control device 25 performs idle control so that an engine rotation speed becomes a target idle rotation speed. The device determines that the idle control has abnormality when an intake air pressure detected by an intake air pressure sensor 50 provided in an intake air passage 3 is the predetermined value or less, and the engine rotation speed is the predetermined value or less for the predetermined period of time during performance of the idle control.
Abstract translation: 要解决的问题：提供能够精确地执行怠速控制的异常拘留的内燃机的转速控制装置。 解决方案：控制装置25执行怠速控制，使得发动机转速成为目标怠速转速。 当由设在吸气通道3中的进气压力传感器50检测到的进气压力为预定值或更小，并且发动机转速为预定值或更小时，该装置确定怠速控制异常 在执行空闲控制期间的时间段。 版权所有（C）2013，JPO＆INPIT
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公开(公告)号：JP2009270510A
公开(公告)日：2009-11-19
申请号：JP2008122420
申请日：2008-05-08
Applicant: Toyota Motor Corp , トヨタ自動車株式会社
Inventor： TAWARA ATSUSHI
CPC classification number: Y02T10/40
Abstract: PROBLEM TO BE SOLVED: To accurately determine whether a pressure reducing valve for reducing the pressure of a fuel in a common rail is normal or abnormal. SOLUTION: An ECU (electronic control unit) executes a program comprising a step (S102) of controlling an injector for stopping injection of a fuel, and a step (S108) of opening a pressure reducing valve if the number of rotation of the output shaft of an engine declines to a threshold (YES in S104). Whether the pressure reducing valve is abnormal or normal is diagnosed based on behavior of the pressure of the fuel in the common rail. COPYRIGHT: (C)2010,JPO&INPIT
Abstract translation: 要解决的问题：为了准确地确定用于降低共轨中的燃料的压力的减压阀是正常还是异常。 解决方案：ECU（电子控制单元）执行包括控制喷射器停止喷射燃料的步骤（S102）的程序，以及如果旋转次数为 发动机的输出轴下降到阈值（S104中为“是”）。 基于共轨中的燃料压力的行为来诊断减压阀是否异常或正常。 版权所有（C）2010，JPO＆INPIT
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