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公开(公告)号：JPH11107742A
公开(公告)日：1999-04-20
申请号：JP27587697
申请日：1997-10-08
Applicant: DENSO CORP
Inventor： YAMASHITA YUKIHIRO , ISOMURA SHIGENORI
Abstract: PROBLEM TO BE SOLVED: To shorten rich time, improve fuel consumption and control torque fluctuation in an exhaust emission control device that executes lean combustion and also temporarily performs rich combustion to recover the purification capability of a NOx catalyst. SOLUTION: An ECU sets the target air/fuel ratio of the mixture to be supplied to an engine 1 to a lean side more than a theoretical air/fuel ratio and makes engine conduct lean combustion based on the target air/fuel ratio. An engine exhaust pipe 3 is provided with a NOx catalyst 19 for purifying the NOx generated during lean combustion. In particular, the branch pipe 25a of the exhaust manifold 25 connected to each cylinder of the engine 1 is extended directly before the NOx catalyst 19, and an air/fuel ratio (A/F) sensor 16 is arranged in the collecting section 25b. In such a case, the exhaust emission gas discharged from each cylinder reaches the NOx catalyst 19 left separated without being mixed with exhaust emission gas form other cylinders in the exhaust pipe 3. Therefore, the exhaust emission gas in the exhaust pipe 3 is quickly switched to a rich atmosphere when switched to a rich combustion mode.
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公开(公告)号：JPH10311234A
公开(公告)日：1998-11-24
申请号：JP12223297
申请日：1997-05-13
Applicant: DENSO CORP
Inventor： NOZAWA MASAE , ISOMURA SHIGENORI , SAWADA YUKIO
Abstract: PROBLEM TO BE SOLVED: To uniformalize air-fuel mixture sucked in a cylinder, and enlarge a low fuel consumption and air-fuel ratio control area. SOLUTION: An air assist type injector 18 is disposed at the intake pipe 2 of an engine 1. Injection fuel from the injector 18 flows in a combustion chamber 13 (in a cylinder) through an intake valve 14. A CPU 33 in an ECU 30 controls an amount per unit time of fuel flowing in a cylinder is controlled according to a velocity of flow intake air in the cylinder and controls drive of the injector 18 such that fuel flows in the cylinder during an intake stoke period in which a velocity of flow of intake air exceeds a given threshold value. In this case, fuel flows in the cylinder at a velocity of flow of fuel proportioning a velocity of flow of intake air or fuel flows in the cylinder at a specified velocity of flow of fuel responding to a time average value of a velocity of flow of intake air. This constitution introduces fuel in the cylinder over a comparatively rapid velocity of flow of intake air, and uniformly mixes air-fuel mixture consisting of fuel and air in the cylinder.
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公开(公告)号：JPH10205369A
公开(公告)日：1998-08-04
申请号：JP1214097
申请日：1997-01-27
Applicant: DENSO CORP
Inventor： ISOBE TAIJI , ISOMURA SHIGENORI
Abstract: PROBLEM TO BE SOLVED: To control turbulence of A/F(the air-fuel ratio) in relation to the steep and complicated accelerating operation. SOLUTION: In an ECU(electronic control unit) 20, intake air pressure as load of an internal combustion engine 1 is estimated according to the mean acceleration opening in which the change of the acceleration opening AP detected by an accelerator opening sensor 9 is smoothed, the throttle opening of a throttle valve 3 is controlled on the basis of the estimated intake air pressure, and the air amount is supplied to the internal combustion engine 1. The fuel amount proportional to the estimated intake air pressure is calculated, the fuel injection time of an injector 17 is controlled, and the fuel amount is supplied to the internal combustion engine 1. Therefore, since the suitable air amount and fuel amount are supplied to the internal combustion engine 1, turbulence of A/F can be restrained even if the accelerating operation is the steep and complicate behavior.
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公开(公告)号：JPH09189215A
公开(公告)日：1997-07-22
申请号：JP13170796
申请日：1996-05-27
Applicant: DENSO CORP
Inventor： DODA HISAYO , KAWAI KATSUHIKO , ISOMURA SHIGENORI
Abstract: PROBLEM TO BE SOLVED: To detect the degree of deterioration of a catalyst with excellent accuracy. SOLUTION: When the output value of an upstream air fuel ratio sensor 28 installed in the upstream of a catalyst 27 is on the rich side of the center air fuel ratio in the upstream of the catalyst, the flow rate of the rich composition flowing into the catalyst 27 is operated based on the deviation. When the output value of the upstream air fuel ratio sensor 28 is on the lean side of the center air fuel ratio in the upstream of the catalyst, the flow rate of the lean composition flowing into the catalyst 27 is operated based on the deviation. When the output value of a downstream air fuel ratio sensor 29 installed in the downstream of the catalyst 27 is on the rich side of the center air fuel ratio in the downstream of the catalyst, the flow rate of the rich composition flowing out of the catalyst 27 is operated based on the deviation. When the output value of the downstream air fuel ratio sensor 29 is on the lean side of the center air fuel ratio in the downstream of the catalyst, the flow rate of the lean composition flowing out of the catalyst 27 is operated based on the deviation. The catalyst adsorption quantity is evaluated from the difference between the in-flow rate and the out-flow rate of each composition.
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公开(公告)号：JPH09158793A
公开(公告)日：1997-06-17
申请号：JP31631695
申请日：1995-12-05
Applicant: DENSO CORP
Inventor： MIWA MAKOTO , ISOMURA SHIGENORI , NISHIO TERUO
Abstract: PROBLEM TO BE SOLVED: To improve abnormality detecting accuracy such as leakage of fuel gas by absorbing the influence of dispersion of the operating condition and an actuator itself. SOLUTION: The fuel gas which is generated in a fuel tank 22 and adsorbed in an adsorbing body 34 of a canister 30 is appropriately discharged into an air intake pipe 2 based on the control of opening/closing a purge control valve 40. When an abnormality of a fuel evaporation preventive mechanism is detected, the negative pressure is introduced in the fuel evaporation preventive mechanism by the prescribed control of opening/closing the purge control valve 40 and a canister closing valve 37, and the negative pressure is kept. The pressure change in introducing the atmospheric pressure after keeping the negative pressure is operated, and the abnormality is judged based on the pressure change. The detecting accuracy is improved because of no effect of dispersion of the change in the operating condition and dispersion of the purge control valve 40 and the canister closing valve 37 themselves.
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Patent Agency Ranking
公开(公告)号：JPH11159423A
公开(公告)日：1999-06-15
申请号：JP32642297
申请日：1997-11-27
Applicant: DENSO CORP
Inventor： NOZAWA MASAE , ISOMURA SHIGENORI
Abstract: PROBLEM TO BE SOLVED: To save energy when an engine is operated while executing satisfactory atomization of fuel. SOLUTION: An air assist type injector 18 injects and supplies fuel to an intake port 17 by taking aim at the umbrella part 14a of an intake valve 14, and the injection opening part of the injector 18 is formed porously so as to obtain the predetermined particle diameter of fuel spray (for example, SMD = about 50 μm). A CPU 31 in an ECU 30 executes air assist by an air supply pump 72 in a low middle rotation area and a low middle load area where the temperature of the umbrella part 14a of the intake valve 14 is low so as to atomize fuel particle diameter to the extent of about 10 μm. The CPU 31 stops air assist by the air supply pump 72 in a high rotation area or a high load area where the temperature of the umbrella part 14a is high. In the case that fuel atomization by air assist is stopped, the particle diameter of injection fuel of the injector 18 is about 50 μm, however, fuel that its atomization is accelerated in the valve umbrella part 14a having high temperature and which is led to flow into a cylinder, is atomized to the same extent when air assist is executed.
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公开(公告)号：JPH11148851A
公开(公告)日：1999-06-02
申请号：JP9730398
申请日：1998-04-09
Applicant: DENSO CORP
Inventor： KATO TAKAHIKO , MIWA MAKOTO , ISOMURA SHIGENORI , MURAMATSU TOSHIHIKO , MINAGAWA KAZUJI , MATSUDA TAKESHI
IPC: B60K15/03 , B60K15/04 , B60K15/077 , F02M25/08 , G01F1/00 , G01F1/10 , G01F1/115 , G01F9/00 , G01F15/075 , G01F22/00 , G01F23/00
Abstract: PROBLEM TO BE SOLVED: To provide a remaining fuel gange for automobile which can measure the remaining amount of fuel in a fuel tank with accuracy even when the fuel tank has a flat or complicated shape without utilizing such a sensor as a level gauge, etc., which detects the level fluctuation of the fuel. SOLUTION: A remaining fuel gange 1 is constituted of fuel amount sensor 5 which measures the amount of the fuel fed to a fuel tank 11, a control circuit 7 which stores the remaining amount of the fuel in the tank 11 and calculates the remaining amount of the fuel in the tank 11 from the stored remaining amount of the fuel, the output of the sensor 5, the amount of the fuel injected from a fuel injection valve 14, and the purged amount of the fuel in the tank 11 by evaporation, and a fuel meter 6 which visually indicates the remaining amount of the fuel in the tank 11 updated by means of the control circuit 7.
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公开(公告)号：JPH1130157A
公开(公告)日：1999-02-02
申请号：JP7012098
申请日：1998-03-19
Applicant: DENSO CORP
Inventor： MURAMATSU TOSHIHIKO , OI KIYOTOSHI , MINAGAWA KAZUJI , MIWA MAKOTO , ISOMURA SHIGENORI
IPC: B60K15/01 , B60K15/077 , F02M25/08 , F02M37/00
Abstract: PROBLEM TO BE SOLVED: To decrease the capacity of a canister as well as to decrease the adverse effect of evaporation fuel to operating performance and exhaust gas purification by controlling tank internal pressure. SOLUTION: In a fuel tank internal pressure control system, a pressure adjusting valve 3 is provided on a communication pipe 8 for communicating a fuel tank 1 and a canister 2 with each other. The pressure adjusting valve 3 is controlled through a control circuit 10 so as to be electrified, it is opened to communicate the fuel tank 1 and the canister 2 with each other, and it is closed to seal the fuel tank 1. The control circuit 10 opens the pressure adjusting valve 3 when oil supply is started, and it controls the pressure adjusting valve 3 on the basis of the detected value of an internal pressure sensor 13 so as to be electrified so that tank internal pressure may be held in the specified pressure range after oil supply is finished. When that leakage is generated is judged after leak check of the whole system is performed, the pressure adjusting valve 3 is closed to seal the fuel tank 1 after negative pressure is introduced into the fuel tank 1, and whether the cause of leak is on the fuel tank 1 side or the pipe side is judged.
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公开(公告)号：JPH10318051A
公开(公告)日：1998-12-02
申请号：JP12744197
申请日：1997-05-16
Applicant: DENSO CORP
Inventor： MURAMATSU TOSHIHIKO , MINAGAWA KAZUJI , MIWA MAKOTO , ISOMURA SHIGENORI
Abstract: PROBLEM TO BE SOLVED: To shorten an electric wire so as to eliminate electric noise reducing means (a RC circuit) built into each solenoid valve by arranging a control circuit for controlling each solenoid valve around a fuel tank. SOLUTION: A pressure regulating valve 3 for holding tank inner pressure within a predetermined pressure range is arranged in a communicating pipe 8 for communicating a fuel tank 1 and a canister 2 with each other, and a purge control valve 12 for regulating a purge flow rate is arranged in a purge pipe 11 for communicating the canister 2 and an intake pipe in an engine with each other. A canister opening/closing valve 9 for opening/closing an atmosphere hole is installed on the canister 2. The pressure regulating valve 3, the purge control valve 12, and the canister opening/closing valve 9 are current-carrying out controlled by a control circuit arranged in the fuel tank 1. The control circuit 10 is connected to an engine control device 18 for controlling an operating condition of the engine through an electric wire, and a signal which is necessary for control is outputted/inputted between the control circuit 10 and the engine control device 18.
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公开(公告)号：JP2001012594A
公开(公告)日：2001-01-16
申请号：JP18940899
申请日：1999-07-02
Applicant: DENSO CORP
Inventor： KONDO TOSHIYUKI , KATO AKIRA , ISOMURA SHIGENORI , MIWA MAKOTO
IPC: B60W10/04 , B60W10/06 , B60W10/10 , B60W10/18 , B60W10/184 , F02D29/00 , F02D29/02 , F16H61/02 , F16H63/50 , B60K41/20
Abstract: PROBLEM TO BE SOLVED: To provide an automatic engine stop/start device for vehicle capable of reducing a shock caused on the vehicle when an engine of a vehicle with automatic engine start/stop function is restarted automatically. SOLUTION: A microcomputer 120 controls an automatic transmission 40 so as to maintain a transmission gear position at 1st position when the amount of depression detected by a depressed amount sensor 110a while an engine 10 is stopped automatically is 30% or higher and, also controls an automatic transmission 10 so as to move the transmission gear position to 2nd position when the amount of the detected depression while the engine 10 is stopped automatically is less than 30%.
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