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公开(公告)号：JPH06137140A
公开(公告)日：1994-05-17
申请号：JP28644392
申请日：1992-10-23
Applicant: TOYOTA MOTOR CORP
Inventor： TANAKA HIROSHI , YOSHIZAKI KOJI , TANAKA SHINICHIRO , HIBINO MASAHIKO
Abstract: PURPOSE:To activate an electrification heating type catalyst by small power in an early stage while reducing a battery load so as to reduce exhaust emission when battery voltage is lowered. CONSTITUTION:First and second electric heater catalysts (EHC) 19, 20 are arranged in the exhaust system of right and left banks 2, 3 of a V-type engine. Respective EHCs 19, 20 are electrically connected to a battery 29 in parallel, and electrified by respecctive relay switches 32, 33 selectively. When it is judged by an ECU 81 that voltage of the battery 29 is reduced on the basis of detection of a voltage sensor 63 it blocks, electrification to the first EHC 19 in which an introduced exhaust temperature is low relatively and controls respective relay switches 32. 33 so that electrification only to the second HEC 20 is allowed. Therefore, in the second EHC 20 to which electrification is allowed, power of the battery 29 whose voltage is reduced is used effectively for heating so as to promote heating and warming-up operation in parallel with exhaust of high temperature.
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公开(公告)号：JPH06129242A
公开(公告)日：1994-05-10
申请号：JP27902092
申请日：1992-10-16
Applicant: TOYOTA MOTOR CORP
Inventor： TANAKA HIROSHI , YOSHIZAKI KOJI , TANAKA SHINICHIRO , HIBINO MASAHIKO
Abstract: PURPOSE:To reduce exhaust emission by effectively utilizing energization heating type catalysts while the load of a battery is lowered upon lowering of the voltage of the battery. CONSTITUTION:First and second catalysts (EHC) 19, 20 each incorporating an electrical heater are located in exhaust systems from left and right banks 2, 3 of a V-type engine. The EHCs 19, 20 are electrically connected in parallel to a battery 29, and are selectively energized by relay switches 32, 33. An ECU 81 controls the relay switches 32, 33 so as to cut off energization to the second EHC 20 where the temperature of introduced exhaust gas is relatively high when it determines lowering of the voltage of the battery 29 in accordance with a detection by a voltage sensor 63, but to allow energization to only the first EHC 19. Accordingly, the warmup is promoted by the heat of introduced exhaust gas in the deenergized second EHC 20, while lower power from a voltage-dropped battery 29 is effectively used in the energized first EHC 19, thereby it is possible to promote heating and warm-up.
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公开(公告)号：JPH0674028A
公开(公告)日：1994-03-15
申请号：JP14099393
申请日：1993-06-11
Applicant: TOYOTA MOTOR CORP
Inventor： TANAKA HIROSHI , YOSHIZAKI KOJI
Abstract: PURPOSE:To improve exhaust gas purification performance and reduce wasteful consumption of power required therefor by efficiently warming up a catalyst at the time of cold starting of an internal combustion engine. CONSTITUTION:Secondary air can be supplied to an electric heater catalyst(EHC) 9 from an electric air pump 20 through an air pipe 21. Current-feeding from a battery 15 to the EHC 9 and the electric air pump 20 can be switched by means of switches 17, 24. The switches 17, 24 are ON- and OFF-controlled at the time of cold starting by means of an ECU 31, so that the operation of the electric air pump 20 is started after starting the operation of the EHC 9, and the operation of the electric air pump 20 is stopped after the operation of the EHC is stopped. The secondary air can thus be supplied to the EHC 9 by means of the electric air pump 20 under the condition that the EHC 9 is heated to a temperature of activation. Power is not wasted after the temperature of the EHC 9 reaches the activation value.
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公开(公告)号：JPH05187226A
公开(公告)日：1993-07-27
申请号：JP20541192
申请日：1992-07-31
Applicant: TOYOTA MOTOR CORP
Inventor： YUKI KIYOSHI , TANAKA HIROSHI
Abstract: PURPOSE:To rapidly increase the temperature of a catalyst to an activation temperature during the starting of an engine regardless of whether the catalyst is new or deteriorated. CONSTITUTION:A catalyst 7 with a heater and a main catalyst 8 are arranged in a catalyst converter 3 and the catalyst 7 is rapidly heated by means of a heater during the starting of an engine. When the catalyst 7 is deteriorated, the activation temperature of the catalyst 7 is increased with the deterioration thereof. Thus, an energizing time of the heater is lengthened with deterioration of the catalyst 7, and when energization of the heater is completed, the temperature of the catalyst 7 is increased to an activation temperature regardless of whether the catalyst is new or deteriorated.
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公开(公告)号：JPH0348150A
公开(公告)日：1991-03-01
申请号：JP19752889
申请日：1989-07-28
Applicant: TOYOTA MOTOR CORP
Inventor： TANAKA HIROSHI , HOSHI KOICHI , KAMIKADO MASARU , SUZUKI MITSUHIRO , MAZAKI RITSUO
IPC: G01N27/409 , F02D41/14 , G01N27/12
Abstract: PURPOSE:To prevent the overshoot of the temp. of a detection part, in an oxygen sensor detecting the concn. of oxygen in the exhaust gas of a vehicle, by deciding whether the control of the supply of a current to the heater of a sensor is performed corresponding to the state of the vehicle to suppress power for a predetermined period when the control is decided to be performed. CONSTITUTION:The current supply condition decision means M1 of a heater controller HC decides whether the supply of a current to the heater HT of an oxygen sensor DS is performed corresponding to the state of a vehicle for a definite time after starting, for example, when a start motor is operated in order to protect a battery or atmospheric temp. is extremely low. When it is decided to perform the control of the supply of a current, the power suppressing means of a motor power control means M2 is controlled by the means M1 and the supply of a current to the heater HT is suppressed for the first predetermined period of current supply. By this method, it is prevented that the temp. of the detection part of the sensor overshoots.
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Patent Agency Ranking
公开(公告)号：JPH0245635A
公开(公告)日：1990-02-15
申请号：JP19679988
申请日：1988-08-05
Applicant: TOYOTA MOTOR CORP
Inventor： SUZUKI MAKOTO , TANAKA HIROSHI , YOSHIMURA KUNIMASA
IPC: F02D41/14
Abstract: PURPOSE:To favourably control the air-fuel ratio by changing the standard signal to the larger value and varying the feedback control constant for the air-fuel ratio to the rich side, when a gas detecting element detects a high temperature. CONSTITUTION:A gas detecting element M1 is connected with a high temperature judging means M4, which is connected with a standard signal varying means M5 and a feedback control constant varying means M6, and when the gas detecting element detects a high temperature, the standard signal is changed to the larger value, and the feedback control constant for air-fuel ratio is changed to the rich side. Therefore, the erroneous control of the air-fuel ratio to the lean side can be prevented, and the air-fuel ratio can be controlled favourably.
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公开(公告)号：JPS63255535A
公开(公告)日：1988-10-21
申请号：JP8870387
申请日：1987-04-13
Applicant: TOYOTA MOTOR CORP
Inventor： TANAKA HIROSHI , KUNIMASA AKIO
Abstract: PURPOSE:To prevent fuel consumption and exhaust emission from becoming worse by reducing the fuel increase valve in proportion to the speed of an automobile and raising the air intake temperature in proportion to the heat as regards an object that prevents overheating of a catalyst through increasing fuel quantity when a heavy load is applied. CONSTITUTION:A detected value of an air flow meter 23, an air intake sensor 25, a throttle sensor 27, a water temperature sensor 28, an engine speed sensor 29, an automobile speed sensor 30, etc., are inputted in a control circuit 31. The primary quantity increase coefficient of the control circuit 31 is set to approximately 0.17 when the throttle opening is more than 70 deg. and to approximately 0.15 when the throttle opening is less than 70 deg. and the engine speed is more than approximately 3,800rpm or the air intake quantity is more than a fixed value. These primary quantity increase coefficient are corrected by a correction factor that reduces as the automobile speed increases and a correction factor that increases as the air intake temperature rises.
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公开(公告)号：JPS618452A
公开(公告)日：1986-01-16
申请号：JP12728284
申请日：1984-06-22
Applicant: Toyota Motor Corp
Inventor： TANAKA HIROSHI , KATOU TAKASHI
Abstract: PURPOSE:To surely prevent engine stall, by providing a dashpot mechanism such that a throttle valve is forced to be slightly opened in a predetermined rotational speed range during deceleration in which the supply amount of fuel is limited by means of a fuel-cut mechanism. CONSTITUTION:In a variable venturi type carburettor 1, there is provided a fuel- cut mechanism 11 such that air is fed to the upstream side of a jet 10 whose flow passage area is changed by means of a needle valve 8 in accordance with the sliding movement of a piston 4, to restrain the discharge of fuel. A dashpot mechanism is coupled to the shaft 16 of a throttle valve 13 through the intermediary of a lever 18, for preventing the throttle valve 15 from abruptly closing upon deceleration. This dashpot mechanism 17 is arranged such that, during deceleration in which a solenoid valve 13 in the fuel-cut mechanism 11 is opened to introduce air into an intake-air system, when the rotational speed of an engine becomes lower that a predetermined value (for example, 200rpm), a solenoid valve 29 is changed over in a predetermined rotational speed range to introduce the atmospheric air into a variable pressure chamber 4 to open the throttle valve 15.
Abstract translation: 目的：为了确保防止发动机失速，通过提供缓冲器机构，使得在通过燃料切断机构限制燃料供给量的减速期间，在预定转速范围内迫使节流阀略微打开。 构成：在可变文丘里型化油器1中，设置有燃料切断机构11，使得空气被供给到喷射器10的上游侧，其流道面积根据滑动而通过针阀8改变 活塞4的运动，以限制燃料的排放。 缓冲器机构通过杆18的中间联接到节流阀13的轴16，用于防止节流阀15在减速时突然关闭。 该缓冲器机构17被布置成使得在减速中，在燃料切断机构11中的电磁阀13被打开以将空气引入进气系统中时，当发动机的转速变得低于预定值时 例如200rpm），在规定的转速范围内切换电磁阀29，将大气引入可变压力室4以打开节流阀15。
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公开(公告)号：JP2003269151A
公开(公告)日：2003-09-25
申请号：JP2002072809
申请日：2002-03-15
Applicant: TOYOTA MOTOR CORP
Inventor： TANAKA HIROSHI
Abstract: PROBLEM TO BE SOLVED: To efficiently perform SOX-poisoning elimination operation of NOX- occlusion reduction catalyst. SOLUTION: A NOX-occlusion reduction catalyst 7 is placed in an exhaust passage 2 of an engine 1, and NOX in the exhaust air is absorbed in the catalyst 7 while the engine is operated at a lean air-fuel ratio, and the absorbed NOX is reduced by changing the air-fuel ratio of the engine to a rich one in a short time. An electronic control unit (ECU) 30 performs SOX-poisoning elimination operation for maintaining the catalyst at high temperature and at the rich air-fuel ratio when SOX is accumulated in the catalyst 7 and SOX poisoning which degrades NOX-occlusion capability occurs. The ECU divides the operating range of the engine into a plurality of ranges and presets the type of SOX- poisoning elimination operation to be performed for each operating range. When the NOX-occlusion capability of the catalyst 7 decreases more than a preset determination level, the ECU determines it as SOX poisoning having occurred in the NOX-occlusion reduction catalyst and performs SOX-poisoning elimination operation corresponding to the operating range. Thus, efficient SOX-poisoning elimination operation suitable for the engine operating condition is performed. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2002188433A
公开(公告)日：2002-07-05
申请号：JP2000388978
申请日：2000-12-21
Applicant: TOYOTA MOTOR CORP
Inventor： IRISAWA YASUYUKI , TANAKA HIROSHI , KAKO JUNICHI
Abstract: PROBLEM TO BE SOLVED: To properly cause NOX to be released from a NOX absorbent. SOLUTION: The NOX absorbent 23 is arranged in an engine exhaust gas passage, when an air/fuel ratio is lean and a NOX ammonia sensor in the engine exhaust gas passage, downstream of the NOX absorbent. When the ammonia concentration starts to increase, after switching the air/fuel ratio into being rich for releasing the NOX from NOX absorbent 23, the air/fuel ratio is switched from lean to rich.
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