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公开(公告)号：JPH06159152A
公开(公告)日：1994-06-07
申请号：JP31192092
申请日：1992-11-20
Applicant: TOYOTA MOTOR CORP
Inventor： SATO YASUSHI , IWANO KAZUHIKO , IZUMITANI NAOHIDE
Abstract: PURPOSE:To analyze existence of abnormality in an EGR device without generating shock caused by decrease in engine rotational speed. CONSTITUTION:An EGR valve 6 and a torque variation means, for example idling rotational speed control(ISC) valve 4 are opened to specified openings, and the engine rotational speed Ne is compared with its specified value and then trouble is diagnosed when it becomes stable. As another method, the EGR valve 6 is gradually opened, and when it is opened to a specified opening, a control quantity of the torque variation means, for example, the opening of the ISC valve 4 (its corrected quantity is also accepted) is compared with the specified value and the trouble is diagnosed. Decrease in the engine rotational speed Ne at the time of opening the EGR valve is decreased by the torque variation means, for example, increase in the engine rotational speed Ne by opening the ISC valve 4, and the shock is decreased.
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公开(公告)号：JPS62298621A
公开(公告)日：1987-12-25
申请号：JP14038386
申请日：1986-06-18
Applicant: TOYOTA MOTOR CORP
Inventor： ONAKA HIDEMI , HOSHI KOICHI , YOSHIOKA MAMORU , IZUMITANI NAOHIDE
IPC: F02B39/00
Abstract: PURPOSE:To prevent the lowering of an idling engine speed on a high land by connecting an air introducing passage to an annular space formed on the periphery of the rotor shaft of a super-charger consisting of a Roots pump and providing a control valve which is opened on a high load in said passage. CONSTITUTION:In a mechanical supercharger 20 which consists of a Roots pump having a pair of rotors 22 and which is provided in the intake passage 12 of an engine 10, holes for inserting rotor shafts 26 are formed on the end plate 24a of its housing 24. Due to this hole, an annular space 36 is formed on the periphery of the rotor shaft 26 in between the end face of the rotor 22 and the inside seal 30 of a bearing 28. And, ports 38 which extend in the radial direction are formed on the end plates 24a so as to introduce the air into the spaces 36, and an air introducing passage 40 in which a control valve 42 is provided in connected to the ports 38. The control valve 42 is controlled so as to be opened when a vehicle is traveling on a high land, by means of an ECU 50.
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公开(公告)号：JPS62223416A
公开(公告)日：1987-10-01
申请号：JP6491886
申请日：1986-03-25
Applicant: TOYOTA MOTOR CORP
Inventor： IZUMITANI NAOHIDE , NOMURA KENICHI , HOSHI KOICHI , YOSHIOKA MAMORU
Abstract: PURPOSE:To prevent the transient knocking by closing a by-pass control valve slowly an an accelerating time of an engine when a teaching value is more than a predetermined value, and closing said valve quickly at an accelerating time of the engine when the teaching value is less than the predetermined value. CONSTITUTION:Teaching value judging means A judge whether a teaching value of an ignition timing adjusting device is more than a set value or not. Accelerating condition detecting means B detect the accelerating condition of an engine E. Control means 60 close a by-pass control valve 40 on a by-pass 30 of a supercharger 28 slowly at an accelerating time when the teaching value is more than the set value. Since in an operating condition when the knocking is generating instensely the teaching value becomes high, under such condition with supercharging pressure builds up slowly, and the transient knocking is prevented. The control means 60 close the by-pass control value 40 quickly at an accelerating time when the teaching value is less than the set value, as a result a preferable supercharging response is ensured.
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公开(公告)号：JPS62186016A
公开(公告)日：1987-08-14
申请号：JP2687786
申请日：1986-02-12
Applicant: TOYOTA MOTOR CORP
Inventor： HOSHI KOICHI , NOMURA KENICHI , YOSHIOKA MAMORU , IZUMITANI NAOHIDE
Abstract: PURPOSE:To improve drivability in restoring fuel cutout for speed reduction and prevent a rise in engine speed and the like in a cold condition by closing a control valve located in an air introduction passage through turning 'ON' an idle switch and the like in a non-fuel cutout condition. CONSTITUTION:A supercharger comprising a Roots vacuum pump is so arranged as to be freely rotatable, with the rotor shafts 22 and 23 of two rotors 21 and 40 supported on a bearing 28 within housings 50 and 51. In the aforesaid constitu tion, a circular space part 47 formed around the rotor shafts 22 and 23 and between the end surfaces of the rotors 21 and 40 and the sealed part 27 of the bearing 28, is made continuous to the atmosphere via air introduction passages 7, 8 and 48, and a control valve 9 is provided in way of said passages 7, 8 and 48. And when an idle switch is 'ON' or the number of engine revolutions is under a predetermined value in a non-fuel cutout condition, the control valve 9 is closed. According to the aforesaid constitution, drivability is improved at the restoration of fuel cutout for speed reduction and a rise in engine speed is prevented in a cold condition.
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公开(公告)号：JPS62179654A
公开(公告)日：1987-08-06
申请号：JP1919386
申请日：1986-02-01
Applicant: TOYOTA MOTOR CORP
Inventor： YOSHIOKA MAMORU , NOMURA KENICHI , HOSHI KOICHI , IZUMITANI NAOHIDE
IPC: G01N27/41 , F02D41/00 , F02D41/14 , G01N27/12 , G01N27/409 , G01N27/419
Abstract: PURPOSE:To increase the durability of a sensor and to stabilize the temp. of an element, by discriminating whether the detected parameter quantity in an operating condition is equal to or greater than a predetermined value and delaying the discrimination result by a predetermined time to perform the ON/OFF operation of current supply to the sensor. CONSTITUTION:In an internal-combustion engine wherein an O2-sensor with a heater is provided to an exhaust system, an operation state parameter quantity detection means detects the operation state parameter quantity of the engine, for example, the intake air quantity Q of the engine. A discrimination means outputs a signal to the delay means at the side of a heater OFF-means when the detected quantity Q is a predetermined value A or more and outputs a signal to the delay means at the side of a heater ON-means when said quantity Q is below the predetermined value A. The delay means at the side of the heater OFF-means delays the signal by a predetermined time when the speed of rotation of the engine is below a predetermined value B to transmit the same to the heater OFF-means to turn the current supply to the heater OFF. The delay means at the side of the heater ON-means delays the signal by a predetermined time when the speed of rotation of the engine is the predetermined value B or more to transmit the same to the heater ON-means. By this method, the life of the heater is increased and the temp. of a sensor element can be stabilized.
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Patent Agency Ranking
公开(公告)号：JPS6270622A
公开(公告)日：1987-04-01
申请号：JP20871085
申请日：1985-09-24
Applicant: TOYOTA MOTOR CORP
Inventor： IZUMITANI NAOHIDE , NOMURA KENICHI , HOSHI KOICHI , YOSHIOKA MAMORU
IPC: F02B33/00
Abstract: PURPOSE:To prevent the unnecessary on-off action of a supercharger, by a method wherein, when the supercharger is shifted from a supercharging state to a non-supercharging state, the shifting is effected with a given delay time except a time in that the number of revolutions of an engine and a load are below their respective set values. CONSTITUTION:A device controls a mechanical type supercharger 3 mounted to a suction system 2 of an internal combustion engine 1 into a supercharging state or a non-supercharging state depending upon the operating state of an engine by means of a supercharger control means 4, e.g., a clutch. The device has a delay means 5, which when shifting is effected from a supercharging state to a non-supercharging state by means of a supercharger control means 4, effects the shifting with a given delay time except a time in which the number of revolutions and a load are below their respective set values. The delay means 5 is formed with a delay circuit 5a, a gate 5b, and a comparator c. The set value is regulated by a set value regulating means 6 so that the more higher value the temperature of an engine is increased to, the more the set value is decreased.
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57.发明专利
公开(公告)号：JPS6155340A
公开(公告)日：1986-03-19
申请号：JP17783684
申请日：1984-08-27
Applicant: Toyota Motor Corp
Inventor： IZUMITANI NAOHIDE
Abstract: PURPOSE:To prevent an exhaust system from overheating, by installing a process, which detects a fact that exhaust temperature reaches the setting value and, after the temperature reaches the setting value, installing another process which makes an air-fuel ratio into being overrich by degrees. CONSTITUTION:There is provided with a process detects a fact that exhaust temperature reaches the setting value in an high speed and high load range of engine. After the exhaust temperature reaches the setting value, there is also provided with a process which makes an air-fuel ratio into being overrich by degrees. For a while till the exhaust temperature reaches the setting value in the high speed and high load range of engine, the air-fuel ratio is maintained in an output air-fuel ratio or an economic air-fuel ratio. Thus, an exhaust system is surely preventable from overheating without entailing any damage to drivability, accelerating performance and a specific fuel consumption.
Abstract translation: 目的：为了防止排气系统过热，通过安装检测排气温度达到设定值的过程，在温度达到设定值之后，安装另一个使空燃比过高的过程， 度。 规定：提供了一个过程，检测到发动机的高速和高负载范围内排气温度达到设定值的事实。 在排气温度达到设定值之后，还具有使空燃比过度浓度的过程。 一直到排气温度达到发动机高速高负荷范围内的设定值时，空燃比保持在输出空燃比或经济空燃比。 因此，排气系统确实可以防止过热，而不会对驾驶性能，加速性能和特定的燃料消耗造成任何损害。
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公开(公告)号：JP2000241381A
公开(公告)日：2000-09-08
申请号：JP3908799
申请日：1999-02-17
Applicant: TOYOTA MOTOR CORP
Inventor： NAGAI TOSHINARI , IZUMITANI NAOHIDE , IDE KOJI
IPC: G01N27/41 , F02D41/14 , G01N27/26 , G01N27/409
Abstract: PROBLEM TO BE SOLVED: To suppress the consumption of a battery when a heater is energized before an internal-combustion engine is started in a control apparatus, for the heater of an air-fuel ratio sensor, which is provided with a function to energize the heater of the air-fuel ratio sensor before the engine is started. SOLUTION: A catalytic converter 60 and a catalytic converter 62 are installed respectively in the exhaust passage 54 and the exhaust passage 56 of an internal-combustion engine 10. A catalytic converter 68 is installed in an exhaust pipe 58 in which the exhaust passages 54, 56 join. A first air-fuel ratio sensor 64 and a first air-fuel ratio sensor 66 as limiting current-type oxygen sensors are installed on the upstream side of the catalytic converters 60, 62. A second air-fuel ratio sensor 70 as a concentration cell-type oxygen sensor is installed on the downstream side of the catalytic converter 68. An ECU 12 starts an energizing operation regarding the second air-fuel ratio sensor 70 whose activation temperature is low when the start of the engine is anticipated by unlocking a door.
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公开(公告)号：JP2000227364A
公开(公告)日：2000-08-15
申请号：JP2742099
申请日：1999-02-04
Applicant: TOYOTA MOTOR CORP
Inventor： IZUMITANI NAOHIDE , AOKI KEIICHIRO , INAGAKI SHINSUKE
Abstract: PROBLEM TO BE SOLVED: To obtain an exhaust gas temperature measuring apparatus employing an air/fuel ratio sensor in order to eliminate a temperature sensor in view point of cost in which the exhaust gas temperature can be measured accurately without limiting the measurement conditions. SOLUTION: In an operating region where conduction to the heater in an air/fuel ratio sensor is not required, exhaust gas temperature is estimated by measuring the element impedance of the air/fuel ratio sensor. In an operating region where conduction to the heater is effected, element temperature drops when conduction to the heater is cut for a predetermined time Δt1 and the element impedance increases. Since increment ΔZ of the element impedance increases as the exhaust gas temperature decreases, exhaust gas temperature can be estimated by measuring ΔZ. Alternatively, exhaust gas temperature may be estimated based on the time Δt2 required for the element impedance increases to be reset to a value before conduction cut after conduction is resumed following to conduction cut.
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公开(公告)号：JPH1136918A
公开(公告)日：1999-02-09
申请号：JP18879397
申请日：1997-07-14
Applicant: TOYOTA MOTOR CORP
Inventor： IZUMITANI NAOHIDE , OSANAI AKINORI
Abstract: PROBLEM TO BE SOLVED: To prevent the absorption of more than a specific amount of evaporated fuel to a canister, by momently detecting various parameters indicating that an internal combustion engine is in a condition having the possibility of the generation of the evaporated fuel, and predicting the trend of the increase of the purge amount in advance. SOLUTION: An operation value of a valve overlap amount is corrected by an ECU 41 for a variable valve timing mechanism, corresponding to a fuel tank internal temperature detected by a parameter indicating that a generation amount of the evaporated fuel discharged from a fuel tank 80 has the trend of increase, that is, a fuel tank temperature sensor 36, among the parameters indicating the operating conditions detected by various sensors. That is, when it is judged that the evaporated fuel discharged from the fuel tank 80 has the trend of increase, the valve overlap amount is corrected so that at least the opening timing of an intake valve 9 is lagged. Whereby the generated negative pressure of the intake passage 7 is increased, and the purge is accelerated.
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