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1. 发明专利

JPH10184426A AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH10184426A
公开(公告)日：1998-07-14
申请号：JP34620796
申请日：1996-12-25
申请人： TOYOTA MOTOR CORP
发明人： YAMANAKA AKIHIRO , OHASHI MICHIHIRO , SAWADA YUTAKA
IPC分类号： F02D45/00 , F01N3/24 , F02D41/02 , F02D41/10 , F02D41/14
摘要： PROBLEM TO BE SOLVED: To perform excellent purification of unburnt HC and CO and NOX in all operation state. SOLUTION: An air-fuel ratio sensor 23 is arranged in an exhaust passage situated upper stream from a three-dimensional catalyst 18. From an air-fuel ratio and an intake air amount detected by the air-fuel ratio sensor 23, a storage oxygen desorption amount of the three-dimensional catalyst 18 is calculated and the air-fuel ratio is controlled so that the storage oxygen desorption amount coincides with a target desorption amount. During acceleration operation the target desorption amount is varied to a high value and degree of the variation is increased with the increase of the number of revolutions of an engine.

2. 发明专利

JPH06221166A INTAKE AIR CONTROL DEVICE FOR FOUR-CYCLE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06221166A
公开(公告)日：1994-08-09
申请号：JP1263293
申请日：1993-01-28
申请人： TOYOTA MOTOR CORP
发明人： OHASHI MICHIHIRO
IPC分类号： F02B29/08 , F02D9/02
摘要： PURPOSE:To provide an intake air control device for a four-cycle internal combustion engine to improve the intake air filling efficiency of each cylinder as the increase of the number of installed drive mechanisms is suppressed. CONSTITUTION:Intake air control valves 161-164 and actuators 171-174 are installed to intake air branch pipes 151-154 connected to four cylinders 11-14 of an internal combustion engine 10. Two cylinders 11, 14 and 12, 13, making a set, between which phase differences of a cycle are different from each other in a 360 deg. arc in the rotation angle of the internal combustion engine, and drive circuits 18a and 18b are installed to respective cylinder sets and controlled by a control part 19. Thus, an intake air control valve is opened during the early stage of an exhaust stroke and by closing an intake valve during opening of an intake air valve, intake air filling efficiency is improved, incurring of the pumping loss of a suction stroke is reduced, and spitting right before closing of the intake air valve is prevented from occurring.

3. 发明专利

JPH02308960A EXHAUST GAS RECIRCULATION QUANTITY CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH02308960A
公开(公告)日：1990-12-21
申请号：JP13032189
申请日：1989-05-24
申请人： TOYOTA MOTOR CORP
发明人： KAWAI TAIYO , NAKAGAWA NORIHISA , OHASHI MICHIHIRO , NAKAMURA NORIO
IPC分类号： F02M25/07
摘要： PURPOSE:To obtain the optimum EGR rate at low/medium-load areas and secure the output at the high-load area by calculating the EGR rate in response to the correction suction pipe pressure corrected in the present atmospheric pressure when the present suction pipe pressure is the preset value or above. CONSTITUTION:A control circuit 52 determines the EGR rate by an EGR valve 36 with the correction suction pipe pressure corrected in response to the atmospheric pressure detected by the suction pipe pressure only when the suction pipe pressure detected by a pressure sensor 13 is the preset pressure or above in the engine atmospheric pressure. At the pressure below the preset pressure on the other hand, i.e., in low/medium-load areas, the EGR rate is determined by the uncorrected suction pipe pressure (in the standard atmospheric pressure), and the optimum EGR quantity is determined. In this case, only the engine rotating speed detected by a rotation angle sensor 54 and the EGR rate based on the suction pipe pressure may be prepared. The optimum EGR rate in low/ medium-load areas is obtained, and the engine output in the high-load area, particularly near the fully opened area of a throttle valve, can be secured.

4. 发明专利

JPH02241963A CONTROL METHOD FOR STEPPER MOTOR DRIVE TYPE EXHAUST GAS RECIRCULATION CONTROL VALVE 失效
公开(公告)号：JPH02241963A
公开(公告)日：1990-09-26
申请号：JP6033289
申请日：1989-03-13
申请人： TOYOTA MOTOR CORP
发明人： OHASHI MICHIHIRO
IPC分类号： F02M25/07 , H02P8/00 , H02P8/08
摘要： PURPOSE:To conduct a proper initialization even if it is a very low temperature at the time of starting by putting a valve element in a totally close position by a step motor when the temperature of an engine becomes more than a designated value after starting and initializing the relationship of the step number of the step motor to the position of the valve element. CONSTITUTION:After starting an internal combustion engine, when the temperature of an engine becomes a designated value or more oil existing in each rotating portion of a step motor 30 is warmed up to be properly viscous, so that the stepper motor 30 outputs required effective output. Thus, in the initialization conducted at this time, a valve element 16 is driven to a designated totally close position to be pressed to a valve seat 14 by designated valve cutoff force under the compressive elastic deformation of a compression coiled spring 48. Thus, the relationship of the step number of the stepper motor 30 to the position of the valve element 16 can be initialized properly.

5. 发明专利

JPH02221655A IDLING CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH02221655A
公开(公告)日：1990-09-04
申请号：JP4159989
申请日：1989-02-23
申请人： TOYOTA MOTOR CORP
发明人： SONODA YUKIHIRO , OSAWA KOICHI , KANAI HIROSHI , HOSHI KOICHI , MATSUOKA HIROKI , OHASHI MICHIHIRO , SAWADA YUTAKA
IPC分类号： F02D41/16 , F02D41/04 , F02D41/06 , F02D41/08 , F02D41/14
摘要： PURPOSE:To prevent the leaning of a mixture and ensure the satisfactory starting and stable operation of an engine by increasingly controlling the increase ratio of idling speed at the time of starting the engine according to an increase in adhered quantity of deposit. CONSTITUTION:Based on the output signal of an oxygen concentration detector 19 disposed in an engine exhaust passage, the injection quantity is controlled by a means A in such a manner that a mixture fed into the engine cylinder has a target air-fuel ratio. Based on the output signal of the oxygen concentration detector 19, the adhered amount of deposit is detected by a means B. The adhered amount of deposit is stored by a means C. The idling speed at the time of engine start is increased by a means D. The increasing ratio of the idling speed at the time of engine start is controlled by a means E in such a manner as to be increased as the adhered amount of deposit is increased. Hence, the leaning of the mixture is prevented, and the satisfactory starting and stable operation are ensured.

6. 发明专利

JPH02199248A FUEL INJECTION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH02199248A
公开(公告)日：1990-08-07
申请号：JP1634789
申请日：1989-01-27
申请人： TOYOTA MOTOR CORP
发明人： SONODA YUKIHIRO , OSAWA KOICHI , KANAI HIROSHI , HOSHI KOICHI , MATSUOKA HIROKI , OHASHI MICHIHIRO , SAWADA YUTAKA
IPC分类号： F02D41/10 , F02D41/04 , F02D41/14 , F02D45/00
摘要： PURPOSE:To maintain an air-fuel ratio at a target value by a method wherein with the increase in the degree of acceleration, a lean/rich decision period of fuel-air mixture is decreased, and when the number of lean times is increased to a value a higher than the number of rich times by a value exceeding a set number, the increase of an injection fuel amount is effected for correction. CONSTITUTION:With the increase in the degree of acceleration decided by a degree of acceleration deciding means 50, a lean/rich decision period of fuel-air mixture is decreased by a decision period control means 51. During the decision period, lean/rich is decided at intervals of a crank angle predetermined by a lean/rich deciding means 52. A deviation between the number of times which it is decided that fuel-air mixture is lean and the number of times which it is decided that the mixture is rich is calculated by a calculating means 53. When the number of lean times is increased to a value higher than the number of rich times and a deviation therebetween exceeds a predetermined set number, an injection fuel amount control means 54 increases an injection fuel amount for correction, and drive of a fuel injection valve 12 is controlled. This constitution enables maintenance of an air-fuel ratio at a target value regardless of the degree of acceleration.

7. 发明专利

JPH02199245A FUEL INJECTION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH02199245A
公开(公告)日：1990-08-07
申请号：JP1634489
申请日：1989-01-27
申请人： TOYOTA MOTOR CORP
发明人： OSAWA KOICHI , OHASHI MICHIHIRO , SAWADA YUTAKA , MATSUOKA HIROKI , MATSUMOTO SHINICHI
IPC分类号： F02D41/10 , F02D41/14
摘要： PURPOSE:To accurately detect the rich/lean condition of mixture by computing the period at which mixture is switched over between a lean condition and a rich one, and thereby computing the deviation in time between the lean condition and the rich one only for the time in response to said period at the time of accelerating operation. CONSTITUTION:A fuel injection quantity control means 50 controls the quantity of fuel injection from a fuel injection valve 12 based on output signals from an O2 sensor 19 in such a way that mixture to be supplied to an engine shall be of a target air-fuel ratio. In this case, the period at which mixture is switched over between a lean condition and a rich one, is computed by a period computing means 51 based on outputs from the O2 sensor 19, after accelerating operation detected by an accelerating condition detecting means 52 has been started, only for the time in response to the period, the deviation in time between the rich and lean conditions of mixture is obtained by a deviation computing means 53. Based on the deviation, the quantity of fuel injection is increased by an increasing means 54 when the lean condition is longer in time than the rich one and when the deviation exceeds a set value. Thus, the lean or rich condition is accurately detected at the time of accelerating operation, an air-fuel ratio can thereby be properly controlled.

8. 发明专利

JPH02130252A ANOMALY JUDGING DEVICE FOR EXHAUST RECIRCULATION DEVICE 失效
公开(公告)号：JPH02130252A
公开(公告)日：1990-05-18
申请号：JP28110988
申请日：1988-11-07
申请人： TOYOTA MOTOR CORP
发明人： NAKAMURA NORIO , OHASHI MICHIHIRO
IPC分类号： F02M25/07
摘要： PURPOSE:To speedily judge anomaly with high precision by compulsorily opening a control valve by a prescribed opening degree in idling state and calculating the variation rate of the revolution speed at this time and comparing the rate with a prescribed value and judging anomaly of an exhaust recirculation device on the basis of the result of the comparison. CONSTITUTION:When an idling judging means M5 judges that an internal combustion engine EG is in idling on the basis of the result of the detection by an operation state detecting means M4, the control valve M2 of an exhaust recirculation device (EGR device) M3 is compulsorily opened by a prescribed opening degree by a compulsorily valve opening means M6. The variation rate of the revolution speed of the engine EG in the case when the valve M2 is opened is calculated on the basis of the result of the detection of the detecting means M4, by an operation speed variation rate calculating means M7, and the variation rate is compared with a prescribed value by a comparing means M8, and an anomaly judging means M9 judges the anomaly of the EGR device M3 on the basis of the result. Further, even if the opening degree of the valve M2 which is detected by the means M6 is little, the revolution variation of the engine EG can be detected, and the generation of stall can be prevented.

9. 发明专利

JPS63219816A SUCTION CONTROLLER FOR SUCTION TWO-VALVE TYPE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPS63219816A
公开(公告)日：1988-09-13
申请号：JP5032287
申请日：1987-03-06
申请人： TOYOTA MOTOR CORP
发明人： OHASHI MICHIHIRO
IPC分类号： F02P5/152 , F02B31/02 , F02P5/15 , F02P5/153
摘要： PURPOSE:To prevent knocking from occurring, by installing a means, altering a valve closing range of a suction control valve according to the octane value of gasoline and also another means opening a suction valve at the time of accleration. CONSTITUTION:A suction passage 2 is divided into two parts by a partition wall 30, and suction control valve 24 is installed in one side of these suction passages. And, there is provided with a device which judges the octane value of gasoline, and also there is provided with a device which alters a valve closing range of the suction control value 24 according to whether ordinary gasoline or premium gasoline. In addition, at the time of the ordinary gasoline, the suction control valve 24 is opened as long as the specified time, and at time of the premium gasoline, an accelerating control means which opens it for longer time than this specified time is provided. With this constitution, even if the ordinary gasoline is put into an engine of premium gasoline specifications by mistake, the occurrence of knocking is preventable.

10. 发明专利

JPS62210221A SUPERCHARGE PRESSURE CONTROLLER OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPS62210221A
公开(公告)日：1987-09-16
申请号：JP5054986
申请日：1986-03-10
申请人： TOYOTA MOTOR CORP
发明人： OHASHI MICHIHIRO , OSAWA KOICHI , KINOSHITA YOSHIAKI
IPC分类号： F02B37/18 , F02B37/12 , F02D23/00 , F02D43/00
摘要： PURPOSE:To prevent the hunting and to improve the followability of supercharge pressure control by bringing a supercharger into a low supercharge pressure condition when the knocking is occurring while bringing the supercharger into a high supercharge pressure condition when the knocking is not occurring. CONSTITUTION:Under a high supercharge pressure condition where the engine load Q/N is higher than a predetermined level, a solenoid valve 28 is turned on to perform the delay angle correction based upon a first referential level (high correction level). Under a low supercharge pressure condition where the engine load is lower than the predetermined level, the solenoid valve 28 is turned off to perform the delay angle correcting based upon a second referential level (low correction level). If the delay angle correction levels are exceeding over a referential level over more than two rotation zones, it is decided that the octane value of fuel is low and the solenoid valve 28 is turned off. If said levels are lower than the referential level, it is decided that the octane value of fuel is high and the solenoid valve 28 is turned on.

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