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81. 发明专利

JP2001227325A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2001227325A
公开(公告)日：2001-08-24
申请号：JP2000035733
申请日：2000-02-14
申请人： TOYOTA MOTOR CORP
发明人： SHIBATA DAISUKE , MATSUSHITA SOICHI , ISHIYAMA SHINOBU , TAWARA ATSUSHI
IPC分类号： F02D45/00 , F01N3/08 , F01N3/24 , F01N3/36 , F02D41/04
摘要： 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.

82. 发明专利

JP2000257419A EXHAUST PURIFICATION METHOD AND DEVICE THEREOF 失效
公开(公告)号：JP2000257419A
公开(公告)日：2000-09-19
申请号：JP5555499
申请日：1999-03-03
申请人： TOYOTA MOTOR CORP
发明人： YANAGIHARA HIROMICHI , TSUKASAKI YUKIHIRO , ISHIYAMA SHINOBU , KOBAYASHI MASAAKI , TAWARA ATSUSHI
IPC分类号： B01D53/86 , B01D53/94 , B01J29/22 , F01N3/08 , F01N3/10 , F01N3/20 , F01N3/24 , F01N3/36
摘要： 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.

83. 发明专利

JP2000179326A PARTICULATE FILTER RECLAMATION CONTROL DEVICE 失效
公开(公告)号：JP2000179326A
公开(公告)日：2000-06-27
申请号：JP35317798
申请日：1998-12-11
申请人： TOYOTA MOTOR CORP
发明人： TAWARA ATSUSHI , SUGIYAMA TOSHIHISA
IPC分类号： F02M25/07 , F01N3/02 , F02D21/08 , F02D41/02 , F02D41/04 , F02D41/40 , F02D43/00
摘要： 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.

84. 发明专利

JP2000170527A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2000170527A
公开(公告)日：2000-06-20
申请号：JP34405898
申请日：1998-12-03
申请人： TOYOTA MOTOR CORP
发明人： SUGIYAMA TOSHIHISA , TAWARA ATSUSHI
IPC分类号： F02M25/07 , F01N3/08 , F01N3/20 , F01N3/24 , F02D41/00 , F02D41/04
摘要： 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.

85. 发明专利

JP2000145435A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2000145435A
公开(公告)日：2000-05-26
申请号：JP32377998
申请日：1998-11-13
申请人： TOYOTA MOTOR CORP
发明人： SUGIYAMA TOSHIHISA , TAWARA ATSUSHI
IPC分类号： F01N3/08 , F01N3/20
摘要： 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.

86. 发明专利

JP2000145434A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JP2000145434A
公开(公告)日：2000-05-26
申请号：JP32370898
申请日：1998-11-13
申请人： TOYOTA MOTOR CORP
发明人： TAWARA ATSUSHI , SUGIYAMA TOSHIHISA
IPC分类号： B01D53/94 , B01J23/40 , F01N3/08 , F01N3/24 , F01N3/28
摘要： 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.

87. 发明专利

JP2003172185A CONTROLLER FOR INTERNAL COMBUSTION ENGINE 审中-公开
公开(公告)号：JP2003172185A
公开(公告)日：2003-06-20
申请号：JP2001367977
申请日：2001-11-30
申请人： TOYOTA MOTOR CORP
发明人： OTSUBO YASUHIKO , MATSUOKA HIROKI , SUGIYAMA TATSUMASA , AOYAMA TARO , ITO TAKEKAZU , TAWARA ATSUSHI
IPC分类号： F02D45/00 , F01N3/08 , F01N3/24 , F01N3/28 , F02D41/14 , F02D41/22 , F02D41/38
摘要： PROBLEM TO BE SOLVED: To provide a controller for an internal combustion engine capable of carrying out highly stable and precise control without influence of fluctuation or the like of operating conditions in regard to maintaining a temperature of an exhaust emission control catalyst at an optimal value. SOLUTION: An electronic control unit 80 carrying out overall control of an operating state of the engine 1 calculates and stores (learns) a numeric value corresponding to each operating condition and capable of providing an optimum temperature rising effect in regard to each of a post injection quantity and an additional fuel quantity by feeding back a detection signal of a first exhaust temperature sensor 74a or a second exhaust temperature sensor 74b. When concurrently executing post injection and fuel addition, the fuel addition is executed by accurately evaluating a temperature rising effect provided by the post injection (feedback control of the additional fuel quantity and learning of a correction amount following the control are carried out). COPYRIGHT: (C)2003,JPO

88. 发明专利

JP2003166434A INTERNAL COMBUSTION ENGINE 审中-公开
公开(公告)号：JP2003166434A
公开(公告)日：2003-06-13
申请号：JP2001366329
申请日：2001-11-30
申请人： TOYOTA MOTOR CORP
发明人： ITO TAKEKAZU , MATSUOKA HIROKI , SUGIYAMA TATSUMASA , OTSUBO YASUHIKO , AOYAMA TARO , TAWARA ATSUSHI
IPC分类号： F02M25/07 , F02D21/08 , F02D41/02 , F02D41/04 , F02D43/00 , F02D45/00
摘要： PROBLEM TO BE SOLVED: To provide an internal combustion engine which adopts a control system for optimizing exhaust characteristics by adjusting a gas amount and sufficiently ensures the stability of an engine output even under the condition that an amount of inert gas in air-fuel mixture supplied to the combustion of the engine exceeds a value at which a generation amount of soot becomes the maximum. SOLUTION: An ECU 80 for controlling the operation of the engine 1 integrally attempts to stabilize a combustion condition first by operating a fuel injection time while continuing low temperature combustion when fluctuation of number of revolution NE of the engine is detected as parameter for reflecting the instability of combustion condition during low temperature combustion. If the instability of combustion condition is not eliminated by the operation of fuel injection time, the ECU 80 confirms that the combustion condition of the engine 1 is unstable due to fluctuation of characteristics of EGR gas accompanied with low temperature combustion and repeats the interruption and restart of low temperature combustion until the characteristics of EGR gas are stabilized. COPYRIGHT: (C)2003,JPO

89. 发明专利

JP2003166413A EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE 审中-公开
公开(公告)号：JP2003166413A
公开(公告)日：2003-06-13
申请号：JP2001367616
申请日：2001-11-30
申请人： TOYOTA MOTOR CORP , DENSO CORP , TOYOTA IND CORP
发明人： AOYAMA TARO , MATSUOKA HIROKI , SUGIYAMA TATSUMASA , OTSUBO YASUHIKO , ITO TAKEKAZU , TAWARA ATSUSHI , OKI MAMORU , YOKOYAMA MASAKUNI , KUSAJI HIDESHI , MIZUGUCHI KEIICHI
IPC分类号： F02D45/00 , B01D46/42 , B01D46/44 , B01D53/94 , F01N3/02 , F01N3/24
摘要： PROBLEM TO BE SOLVED: To provide a technology which suppresses excessive degradation of the determination accuracy even when the PM trapping quantity of a trapping mechanism is not reflected in the pressure loss of the exhaust emission by the trapping mechanism in an exhaust emission control device of an internal combustion engine having the trapping mechanism to trap PM in the exhaust emission. SOLUTION: In the exhaust emission control device of the internal combustion engine which determines the PM trapping quantity of a particulate filter disposed in an exhaust system of the internal combustion engine with the differential pressure before and behind the particulate filter as a parameter, when the PM trapping quantity of the particulate filter is not reflected in the differential pressure before and behind the particulate filter, the PM trapping quantity is estimated based on the history of the differential pressure when the PM trapping quantity has been reflected. COPYRIGHT: (C)2003,JPO

90. 发明专利

JP2003161140A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 审中-公开
公开(公告)号：JP2003161140A
公开(公告)日：2003-06-06
申请号：JP2001361296
申请日：2001-11-27
申请人： TOYOTA MOTOR CORP , DENSO CORP , TOYOTA IND CORP
发明人： AOYAMA TARO , MATSUOKA HIROKI , SUGIYAMA TATSUMASA , OTSUBO YASUHIKO , ITO TAKEKAZU , TAWARA ATSUSHI , OKI MAMORU , YOKOYAMA MASAKUNI , KUSAJI HIDESHI , MIZUGUCHI KEIICHI
IPC分类号： F02D45/00 , B01D46/42 , B01D53/94 , F01N3/02 , F01N3/24
摘要： PROBLEM TO BE SOLVED: To provide a technology capable of determining the regeneration timing of a trapping mechanism with high accuracy in an exhaust emission control device for an internal combustion engine provided with the trapping mechanism for trapping particulates such as a soot contained in an exhaust gas. SOLUTION: This exhaust emission control device for the internal combustion engine performs the regeneration treatment of a particulate filter provided that an exhaust pressure loss caused by the particulate filter installed in an exhaust passage of the engine exceeds a predetermined judgment reference value, and is characterized in that the judgment standard value is corrected in response to the pressure loss detected just after the particulate filter is regenerated. COPYRIGHT: (C)2003,JPO

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