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公开(公告)号：JP2005002867A
公开(公告)日：2005-01-06
申请号：JP2003166428
申请日：2003-06-11
Applicant: Toyota Motor Corp , トヨタ自動車株式会社
Inventor： KASHIWANUMA NOBUAKI , NAKAGAWA NORIHISA , YOSHIOKA MAMORU
Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission control system of an internal combustion engine for inhibiting unburned fuel components remaining in an exhaust gas passage from being discharged into the air in an engine stop. SOLUTION: The exhaust emission control system includes a catalyst for cleaning exhaust gas, a catalytic-activity judgement means, a fuel-supply stop means, and an air-supply means. The catalytic-activity judgement means makes judgement whether the catalyst is active or not, the fuel-supply stop means stops fuel supply to the internal combustion engine on request for engine stop. The air-supply means increases exhaust gas or the amount of air flowing into the catalyst by supplying air to the upstream of the catalyst, only when engine stop is requested and the catalytic-activity judgement means has made a judgement that the catalyst is activated. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract translation: 要解决的问题：提供一种内燃机的废气排放控制系统，用于将残留在废气通道中的未燃烧燃料成分排放到发动机停止中的空气中。 解决方案：废气排放控制系统包括用于清洁排气的催化剂，催化活性判断装置，燃料供应停止装置和供气装置。 催化活性判定装置判断催化剂是否有效，燃料供应停止装置根据要求停止对内燃机的燃料供给。 供气装置仅在需要发动机停止并且催化活性判定装置判断为催化剂被活化时，通过向催化剂的上游供应空气来增加废气或流入催化剂的空气量。 版权所有（C）2005，JPO＆NCIPI
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公开(公告)号：JPH0674104A
公开(公告)日：1994-03-15
申请号：JP621493
申请日：1993-01-18
Applicant: TOYOTA MOTOR CORP
Inventor： OTSUKA TAKAYUKI , KASHIWANUMA NOBUAKI
Abstract: PURPOSE:To prevent erroneous diagnosis, in relation to a device for diagnosing failure of an evaporative purge system provided in such constitution that evapo ration fuel (vapor) in an internal combustion engine is adsorbed on adsorbent in a canister, and adsorbed fuel is discharged (purge) into the intake system in the internal combustion engine to burn it under a specific operational condi tion. CONSTITUTION:It is judged just after start of an engine whether inter-tank pressure is a valve on positive pressure side more than that of a positive pressure Y pa (step 102, 103). When it is a valve on the positive pressure side more than that of Y pa, practice flag is set to '1' (step 121), and then failure diagnosis is inhibited until the engine is restated later. Failure diagnosis is carried out at step 103 only when it is judged that inter-tank pressure is a value on the atmosphere pressure side more than Y Pa.
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公开(公告)号：JPH04318267A
公开(公告)日：1992-11-09
申请号：JP8690791
申请日：1991-04-18
Applicant: TOYOTA MOTOR CORP
Inventor： OTSUKA TAKAYUKI , SAWANO MASAYUKI , KASHIWANUMA NOBUAKI
IPC: F02M25/08
Abstract: PURPOSE:To surely detect abnormality even in the case that fuel adsorbed to a canister is in a small amount, relating to an abnormality detecting device for an evaporation purge system constituted such that the abnormality is detected based on a change of air-fuel ratio before and after execution of a purge. CONSTITUTION:In an abnormality detecting device for an evaporation purge system provided in the evaporation purge system 20 for purging fuel through a purge passage 15 by a canister 11 relating to an intake pipe 14 of an engine and for detecting abnormality of the evaporation purge system 20 by detecting a change of air-fuel ratio at purge execution time by an ECU21, an atmospheric opening pipe 19 for introducing the atmosphere to the purge passage 15 is provided. A VSVl6 for selectively introducing fuel and the atmosphere to the purge pipe 15 is provided further to constitute the ECU21 to detect abnormality of the evaporation purge system 20 based on air-fuel ratio at atmospheric air supply time and air-fuel ratio at purge execution time.
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公开(公告)号：JPH04187848A
公开(公告)日：1992-07-06
申请号：JP31279490
申请日：1990-11-20
Applicant: TOYOTA MOTOR CORP
Inventor： KASHIWANUMA NOBUAKI , SAWANO MASAYUKI
Abstract: PURPOSE:To lessen the air-fuel ratio fluctuation by deciding that the catalyst has been degraded, when the inversion frequency of the output signal from a downstream-side air-fuel ratio detection means 15 is higher than a specified frequency with the operational engine state being in a predetermined operational state. CONSTITUTION:When judging the degradation of catalyst, the rate of change in the air-fuel ratio correction factor FAF is decreased to make the rate of change in air-fuel ratio low, so as to cause reduction in the rate of change in the O2 storage in the catalyst. That is, since larger degradation in catalyst results in a decrease in the maximal content of O2, the time length in which the O2 storage amount in the catalyst becomes zero increases, so that the frequency with which the output signal from a downstream-side O2 sensor 15 exceeds a comparing voltage increases. Accordingly, if a ratio is taken between the inversion frequency of an upstream-side O2 sensor 13 and that of the downstream-side O2 sensor 15, it would be possible to decide a large degradation of the catalyst. This can lessen the fluctuation in the air-fuel ratio.
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公开(公告)号：JPH04153553A
公开(公告)日：1992-05-27
申请号：JP27560790
申请日：1990-10-15
Applicant: TOYOTA MOTOR CORP
Inventor： KASHIWANUMA NOBUAKI
Abstract: PURPOSE:To detect the purge anomaly over the whole device by detecting the anomaly of the device on the basis of the output detection pressure of a pressure sensor installed midway in a vapor passage. CONSTITUTION:A fuel tank 11 communicates to a canister 13 through a vapor passage 12, and the canister 13 communicates to an intake passage 16 through a purge passage 14 having a purge control valve 15 midway. A pressure sensor 17 is installed midway in the vapor passage 12, and an anomaly detecting means 18 for detecting the anomaly of the device on the basis of the output detection pressure of the pressure sensor 17 is installed. The anomaly detecting means 18 detects the anomaly of the whole device including the anomaly of the vapor passage 12 on the basis of the output detection pressure of the pressure sensor 17 in the ordinary case and the output detection pressure of the pressure sensor 17 in the case where the purge control valve 15 is turned ON or OFF.
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Patent Agency Ranking
公开(公告)号：JPH041444A
公开(公告)日：1992-01-06
申请号：JP10414590
申请日：1990-04-18
Applicant: TOYOTA MOTOR CORP
Inventor： KASHIWANUMA NOBUAKI
Abstract: PURPOSE:To perform such a trouble detection that is high in reliability by operating a secondary air feeder forcibly when entering the steady driving after completion of the warm-up of an internal combustion engine, and regulating an air-fuel ratio in an inlet system so as to make an exhaust air-fuel ratio become rich if the secondary air feeder goes wrong. CONSTITUTION:At time of driving an internal combustion engine M1, a steady driving judging means M8 judges whether it is in a steady driving state of idling or the like after the completion of warming up or not on the basis of detection of a driving state detecting means M7. When it is so judged as the steady driving state, a secondary air control means M9 controls a secondary air feeder M3, performing the supply of secondary air forcibly. At this time, a fuel control means M10 controls a fuel supply means M6 to regulate an air- fuel ratio in an inlet system M5 so as to make an exhaust air-fuel ratio become rich if the secondary air feeder M3 goes wrong, feeding the inlet system M5 with fuel. Then, a trouble judging means M11 judges that the secondary air feeder goes wrong when the detected value of an exhaust air-fuel ratio detecting means M4 is rich.
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公开(公告)号：JPS63295835A
公开(公告)日：1988-12-02
申请号：JP12573687
申请日：1987-05-25
Applicant: TOYOTA MOTOR CORP
Inventor： KASHIWANUMA NOBUAKI
Abstract: PURPOSE:To prevent emission from worsening due to deterioration of parts, by providing an air-fuel ratio sensor detecting air-fuel ratio of an engine, control constant arithmetic means calculating an air-fuel ratio feedback control constant and an alarm means urging an alarm. CONSTITUTION:A catalytic converter 12, which contains a ternary catalyst simultaneously purifying three harmful components HC, CO, NOx in exhaust gas, is provided in an exhaust system in the downstream from an exhaust manifold 11. O2 sensors 13, 15 generate an electric signal in accordance with the concentration of an oxygen component in the exhaust gas. An alarm 18 displays the O2 sensor 13 in the upstream side or a fuel injection valve 7 to deteriorate. In this way, emission can be prevented from worsening due to deterioration of parts by promoting replacement of the parts.
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公开(公告)号：JPS61229946A
公开(公告)日：1986-10-14
申请号：JP6913885
申请日：1985-04-03
Applicant: TOYOTA MOTOR CORP
Inventor： KASHIWANUMA NOBUAKI , NAKAJO YOSHIKI , BESSHO HIRONORI , MASUI TAKATOSHI , KATSUNO TOSHIYASU , TANAHASHI TOSHIO
Abstract: PURPOSE:To prevent fuel consumption and exhaust emission from degradation by providing a comparing means for comparing the output of an air fuel ratio sensor with a comparing voltage, a delay means for delay processing the compared result and an air fuel ratio adjusting means for adjusting the air-fuel ratio of an engine. CONSTITUTION:First and second air-fuel ratio sensors for detecting the concentration of specified component in exhaust gas are provided upstream and downstream of a catalyst converter. A delay means delays and processes the compared result of a first comparing means to shift the controlled air-fuel ratio of the output of the first air-fuel ratio sensor from a lean air fuel ratio to the the oretical air-fuel ratio. An air-fuel ratio adjusting means adjusts the air-fuel ratio of an engine. Thus,the fuel consumption and exhaust emission can be prevented from degradation.
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公开(公告)号：JPS61229944A
公开(公告)日：1986-10-14
申请号：JP6993085
申请日：1985-04-04
Applicant: TOYOTA MOTOR CORP
Inventor： KATSUNO TOSHIYASU , KASHIWANUMA NOBUAKI , BESSHO HIRONORI , MASUI TAKATOSHI , NAKAJO YOSHIKI , TANAHASHI TOSHIO
Abstract: PURPOSE:To prevent fuel consumption, driveability and emission from degradation by providing an air-fuel ratio correction amount calculating means for calculating the air fuel ratio correction amount according to the output of an air-fuel ratio sensor and an air-fuel ratio adjusting means for adjusting the air-fuel ratio of an engine. CONSTITUTION:A first air-fuel ratio correction amount calculating means C calculates first air-fuel ratio correction amount FAF1 according to the output V1 of the upstream side air-fuel ratio sensor A. a second air-fuel ratio correction amount calculating means D calculates second air-fuel correction amount FAF2 according to the output V2 of the downstream side air-fuel ratio sensor B, this correction amount FAF2 being memorized by a memory means E. An air-fuel adjusting means F adjusts the air-fuel ratio of an engine Thus, fuel consumption, driveablity and emission can be prevented from degradation.
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公开(公告)号：JPS61215434A
公开(公告)日：1986-09-25
申请号：JP5612785
申请日：1985-03-22
Applicant: TOYOTA MOTOR CORP
Inventor： NAKAJO YOSHIKI , KASHIWANUMA NOBUAKI , BESSHO HIRONORI , MASUI TAKATOSHI , KATSUNO TOSHIYASU , TANAHASHI TOSHIO
Abstract: PURPOSE:To aim at improvement in a responsive speed ever so better, by installing each air-fuel ratio sensor at both upstream and downstream sides of a catalytic converter and at the time of compensating a delay time at the time of air-fuel ratio control by the sensor at the upstream side with output of the sensor at the downstream side, making a possibility that the delay time becomes more than the specified time limitable. CONSTITUTION:Each of air-fuel ratio sensors 13 and 15 is installed at both upstream and downstream sides of a catalytic converter in an exhaust system, and each output of these sensors 13 and 15 is compared with each of specified values VR1 and VR2 by comparing devices A1 and A2. According to the compared result to the comparing device A2, a delay time TDR delaying the compared result of the comparing device A1 is calculated by an operational device B, and when this is judged as being larger than the specified time TR2 by a comparing device C, the delay time TDR is subtracted as much as the specified value tR. And, at a delaying device E, the compared result of the comparing device A1 is delayed according to output of an adjusting device D, and an air-fuel ratio compensation value FAF is found by an operational device F on the basis of the compared result after delaying, then further this compensation value FAF is adjusted for increase or decrease by a varying device G on the basis of output of the comparing device C.
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