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81. 发明专利

JPH10231749A CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH10231749A
公开(公告)日：1998-09-02
申请号：JP19283797
申请日：1997-07-17
申请人： TOYOTA MOTOR CORP
发明人： SHIBAGAKI NOBUYUKI
IPC分类号： F02P5/15 , F02D41/14 , F02D43/00 , F02D45/00
摘要： PROBLEM TO BE SOLVED: To surely detect misfire using a crank angle sensor, and also suppress the misfire surely by judging a misfire level according to the magnitude of a driving force fluctuation rate generated by at least one of cylinder, and controlling an air-fuel ratio according to the misfire level to be judged. SOLUTION: While a vehicle is traveled, in an electrically controlled unit 20, output signals of an air flow meter 6, a crank angle sensor 15, and the like are inputted, and a fuel injection time is calculated. The lapse time of a crank angle of 30 deg. in the vicinity of a compression top dead center, and the lapse time of a crank angle of 30 deg. in the vicinity of 90 deg. after a compression top dead center, are found out, and angle speed of a crank angle within each crank angle is respectively found out. A driving force fluctuation rate generated by at least one of cylinder on the basis of each angle speed is calculated, and also a misfire level is judged according to the magnitude of the driving force fluctuation rate to be calculated so as to control an air-fuel ratio by changing a lean limit feed back coefficient according to the misfire level to be judged.

82. 发明专利

JPH10176590A OUTPUT FLUCTUATION DETECTING METHOD FOR MULTICYLINDER INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH10176590A
公开(公告)日：1998-06-30
申请号：JP33729796
申请日：1996-12-17
申请人： TOYOTA MOTOR CORP
发明人： SHIBAGAKI NOBUYUKI
IPC分类号： F02D45/00
摘要： PROBLEM TO BE SOLVED: To accurately detect the output fluctuation or torque fluctuation of each cylinder by detecting the first and second angular velocities of a crankshaft in the first and second crank angle ranges, and detecting the output fluctuation of the first cylinder based on the actual second angular velocity and the virtual second angular velocity. SOLUTION: An ECU20 controlling a four-cylinder internal combustion engine 1 sets the first crank angle range in the crank angle region from the terminal stage of the compression stroke to the initial stage of the explosion stroke for each cylinder, and it sets the second crank angle range in the crank angle region from the first crank angle to the intermediate stage of the explosion stroke. The ECU 20 detects the first and second angular velocities of a crankshaft in the first and second crank angle ranges, and it detects the output fluctuation of the first cylinder based on the actual second angular velocity of the first cylinder at the time of next combustion and the virtual second angular velocity of the first cylinder at the time of next combustion when the output of the first cylinder is assumed not to be fluctuated.

83. 发明专利

JPH09324680A AIR-FUEL RATIO CONTROLLING METHOD OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH09324680A
公开(公告)日：1997-12-16
申请号：JP14188296
申请日：1996-06-04
申请人： TOYOTA MOTOR CORP
发明人： SHIBAGAKI NOBUYUKI
IPC分类号： F02D45/00 , F02D41/04 , F02D41/14
摘要： PROBLEM TO BE SOLVED: To prevent air-fuel ratio correcting errors by detecting running on a bad road through the calculation of the amount of fluctuation of driving forces based on the range of crank angles from the final stage of the compression stroke to the first stage of the explosion stroke and on each of angular velocities in a crank angle range at the middle stage of the explosion stroke, and inhibiting correction of the air-fuel ratio during running on bad roads. SOLUTION: An ECU 20, to which signals output from a crank angle sensor 14 and the like are input, calculates the elapsed time Ta(i) from the compression top dead center(TDC) of an (i)-th cylinder to 30 deg. after the compression top dead center(ATDC) and the elapsed time Tb(i) from the ATDC 60 deg. to the ATDC 90 deg. of the (i)-th cylinder. When 30 deg.-crank angle/Ta(i) is the first angular velocity, ωa, of the (i)-th cylinder and 30 deg.-crank angle/Tb(i) is the second angular velocity, ωb, of the (i)-th cylinder, the driving forces and torque which each cylinder produces are calculated from these detected values, the average value of the amplitude of fluctuation of Ta(i) is calculated, and if the average value exceeds a certain value for not less than a certain period of time, correction of the air-fuel ratio is inhibited.

84. 发明专利

JPH06280550A EXHAUST PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06280550A
公开(公告)日：1994-10-04
申请号：JP6539593
申请日：1993-03-24
申请人： TOYOTA MOTOR CORP
发明人： SHIBAGAKI NOBUYUKI , OKANO HIROSHI
IPC分类号： F02D41/04 , F01N3/08 , F01N3/24 , F02D41/10 , F02D45/00
摘要： PURPOSE:To prevent NOX from discharging to the atmosphere by providing a means for estimating the amount of NOX absorbed in NOX reducer and a means for detecting accelerating operation while arranging the NOX absorber in an engine exhaust passage. CONSTITUTION:NOX absorbent 17 is arranged in an engine exhaust passage to absorb NOX. When flow-in exhaust gas is in lean condition, and to discharge absorbed NOX when flow-in exhaust gas is in theoretical air-fuel ratio condition or rich condition. A pressure sensor 19 is installed to be generated output voltage proportionally to absolute pressure in a surge tank 10. A rotating speed sensor 25 is connected to an input port 35 to be generated output pulse displayed engine rotating speed. NOX absorbing amount is calculated on the basis of the output signal of the pressure sensor 19 and the rotating speed sensor 25. When an estimated NOX amount is a setting value or less, the air-fuel ratio of mixture air makes in lean condition. When the estimated NOX amount is a setting value and more, the air-fuel ratio makes in theoretical air-fuel ratio condition or rich condition. It is thus possible to reduce a fuel consumption amount while preventing NOX from discharging to atmosphere.

85. 发明专利

JPH06272540A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06272540A
公开(公告)日：1994-09-27
申请号：JP5890893
申请日：1993-03-18
申请人： TOYOTA MOTOR CORP
发明人： SHIBAGAKI NOBUYUKI
IPC分类号： F01N3/08 , F01N3/18 , F01N3/24 , F02D41/04
摘要： PURPOSE:To release NOx absorbent for a short time by increasing the degree of air fuel ratio rich in exhaust gas flowing into the NOx absorbent in proportion to an amount of NOx estimated to be absorbed in the NOx absorbent. CONSTITUTION:An NOx absorbent 17 for absorbing NOx when inflow exhaust gas is lean an releasing the absorbed NOx when the inflow exhaust gas gets rich is disposed in an exhaust path of an engine. An amount of NOx absorbed in the absorbent 17 is estimated and the degree of richness of air fuel ratio when the air fuel ratio of the exhaust gas flowing into the NOx absorbent 17 to release the NOx from the NOx absorbent 17 gets rich is increased in proportion to an amount of NOx estimated to be absorbed in the NOx absorbent 17. Thus, unburnt HC and CO are blocked from being emitted to the atmosphere while the NOx can be released from the NOx absorbent 17 for a short time.

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