公开(公告)号：US6000385A

公开(公告)日：1999-12-14

申请号：US999634

申请日：1997-10-31

申请人： Takao Fukuma

发明人： Takao Fukuma

IPC分类号： F02B3/06 ,  F02D21/08 ,  F02D41/00 ,  F02D41/02 ,  F02D41/14 ,  F02D45/00 ,  F02M25/07

CPC分类号： F02D41/144 ,  F02D41/0072 ,  F02M26/46 ,  F02M26/49 ,  F02B3/06 ,  Y02T10/47

摘要： A combustion engine with an EGR apparatus has an EGR path connecting an exhaust path and an intake path. An EGR control valve is mounted in the EGR path for controlling the amount of flow of an EGR gas flowing from the exhaust path to the intake path. The combustion engine also has an oxygen concentration sensor mounted downstream of a joint of the intake path and the EGR path, and in the intake path, for detecting a concentration of oxygen in an intake air. The intake air contains the EGR gas and an air introduced from an atmosphere via the intake path. The combustion engine also has converted actual EGR ratio calculating means for calculating a converted actual EGR ratio on the basis of the concentration of oxygen in the intake air detected by the sensor. The converted actual EGR ratio is a ratio of an actual EGR ratio to an actual air ratio. The actual EGR ratio is a ratio of the amount of the EGR gas to the amount of the intake air.

摘要翻译： 具有EGR装置的内燃机具有连接排气通路和进气通路的EGR通路。 EGR控制阀安装在EGR通路中，用于控制从排气路径到进气路径的EGR气体的流量。 内燃机还具有安装在进气路径和EGR路径的关节下游的氧浓度传感器，并且在进气路径中，用于检测进气中的氧浓度。 吸入空气含有EGR气体和从大气经由进气路径引入的空气。 内燃机还具有转换的实际EGR率计算装置，用于基于由传感器检测到的进气中的氧气浓度来计算转换后的实际EGR率。 转换后的实际EGR率是实际EGR率与实际空气比的比。 实际的EGR率是EGR气体的量与吸入空气量的比。

公开(公告)号：US5167211A

公开(公告)日：1992-12-01

申请号：US860674

申请日：1992-03-30

申请人： Takao Fukuma ,  Hiroshi Okano

发明人： Takao Fukuma ,  Hiroshi Okano

IPC分类号： F02B31/02 ,  F02B1/04 ,  F02B31/00 ,  F02B31/04 ,  F02B31/08 ,  F02F1/24 ,  F02F1/42 ,  F02M35/10 ,  F02M69/00 ,  F02M69/04

CPC分类号： F02M35/10085 ,  F02B31/04 ,  F02B31/085 ,  F02F1/4214 ,  F02M35/10216 ,  F02M35/10262 ,  F02M35/1085 ,  F02M69/044 ,  F02B1/04 ,  F02B2031/006 ,  F02F2001/245 ,  F02M35/10347 ,  F02M35/10367 ,  Y02T10/146

摘要： An air intake system for a fuel injection engine having cylinders equipped with a swirl port and a conventional straight port. The air intake system comprises a swirl control valve for opening or closing the inlet air passage to the straight port, and further comprises an adapter piece installed in the division wall separating the inlet air passages into the swirl port and the straight port. An aperture communicating both inlet air passages is formed in the adapter piece, and the size thereof is optimized in consideration of the size of an air induction hole disposed in the swirl control valve, to thereby obtain a larger operation area of the air fuel ratio of the lean air fuel mixture supplied to the engine.

公开(公告)号：US5080074A

公开(公告)日：1992-01-14

申请号：US643767

申请日：1991-01-22

申请人： Keisuke Tsukamoto ,  Toshio Takaoka ,  Takao Fukuma ,  Hirofumi Yamasaki

发明人： Keisuke Tsukamoto ,  Toshio Takaoka ,  Takao Fukuma ,  Hirofumi Yamasaki

IPC分类号： F02D41/02 ,  F02D41/04 ,  F02D41/14 ,  F02D41/24 ,  F02D41/32 ,  F02D45/00

CPC分类号： F02D41/2412 ,  F02D41/2496 ,  F02D41/32

摘要： An air-fuel ratio control device comprising a memory which stores the relationship between the degree of opening of the throttle valve and the absolute pressure in the intake passage, which pressure is produced when the engine is in a cruising state. When a difference between the blunt value of the actual absolute pressure in the intake passage and the absolute pressure stored in the memory exceeds a fixed value, the air-fuel mixture is changed from the mixture for the stoichiometric air-fuel ratio to a lean mixture.

公开(公告)号：US5067465A

公开(公告)日：1991-11-26

申请号：US655646

申请日：1991-02-14

申请人： Hirofumi Yamasaki ,  Kiyoshi Yagi ,  Keisuke Tsukamoto ,  Toshio Takaoka ,  Takao Fukuma

发明人： Hirofumi Yamasaki ,  Kiyoshi Yagi ,  Keisuke Tsukamoto ,  Toshio Takaoka ,  Takao Fukuma

IPC分类号： F02D41/14

CPC分类号： F02D41/1494

摘要： A lean burn internal combustion engine wherein a basic fuel amount is calculated from a map based on the intake pressure and the engine speed, and a lean correction factor, which is multiplied by the basic fuel amount, is calculated from a lean map based on the intake pressure and engine speed. A second lean map based on the throttle opening and engine speed is provided for obtaining a lean correction factor when the degree of opening of the throttle valve is larger than a predetermined value. A lean sensor is provided for obtaining a signal indicating the air fuel ratio for carrying out a feedback control. The lean sensor is provided with a heater for controlling the temperature of the sensing element of the heater. A basic map for the heater power, which is based on the intake pressure and engine speed, is provided, and a correction map for the heater power is provided for reducing the heater power from the value obtained from the basic map when the lean map based on the intake pressure and engine speed is employed for obtaining the lean air-fuel mixture, to prevent thermal damage to the sensor element.

公开(公告)号：US5060618A

公开(公告)日：1991-10-29

申请号：US646668

申请日：1991-01-28

申请人： Toshio Takaoka ,  Keisuke Tsukamoto ,  Takao Fukuma ,  Hirofumi Yamasaki

发明人： Toshio Takaoka ,  Keisuke Tsukamoto ,  Takao Fukuma ,  Hirofumi Yamasaki

IPC分类号： F02D41/04 ,  F02D21/08 ,  F02D41/00 ,  F02D41/14 ,  F02D45/00

CPC分类号： F02D41/005 ,  F02D41/1497 ,  Y02T10/47

摘要： In an internal combustion engine, a vibration period and a vibration amplitude are measured and the detected vibration period is compared with a natural vibration period prestored in accordance with a driving condition of the vehicle. If the detected vibration period is equal to the natural vibration period under the driving condition at which the vibration period is detected, it is determined that surging due to a torque variation of the engine is occurring. In this condition, the torque variation is controlled to be a predetermined value by increasing an air-fuel ratio or decreasing an amount of EGR when the detected vibration amplitude is smaller than a predetermined value, and the torque variation is controlled to a predetermined value by decreasing an air-fuel ratio or increasing an amount of EGR when the detected vibration amplitude is larger than a predetermined value, and accordingly, the driveability and emission rate are improved.

公开(公告)号：US5058556A

公开(公告)日：1991-10-22

申请号：US638844

申请日：1991-01-08

申请人： Takao Fukuma ,  Keisuke Tsukamoto ,  Toshio Takaoka ,  Hirofumi Yamasaki

发明人： Takao Fukuma ,  Keisuke Tsukamoto ,  Toshio Takaoka ,  Hirofumi Yamasaki

IPC分类号： F02D35/00 ,  F02D41/14 ,  F02D41/22 ,  F02D45/00 ,  G01N27/406

CPC分类号： G01N27/4065 ,  F02D41/148

摘要： A device for determining an activated condition of the oxygen sensor of a lean sensor for an electric-controlled fuel injection internal combustion engine. When the engine is under a fuel cut operation, the output level from the oxygen sensor is compared with a first predetermined threshold level or with a second predetermined threshold level which is lower than the first threshold level. A determination of the activated condition of the oxygen sensor is obtained when the output level from the oxygen once exceeds the higher first level, or when the output level from the oxygen sensor consecutively exceeds the higher first level twice, whereby a positive and quick determination of the activated condition of the oxygen sensor can be obtained.

摘要翻译： 一种用于确定用于电控燃料喷射内燃机的稀薄传感器的氧传感器的激活状态的装置。 当发动机处于燃料切断操作时，将来自氧气传感器的输出水平与第一预定阈值水平或低于第一阈值水平的第二预定阈值水平进行比较。 当来自氧气的输出水平一次超过较高的第一水平，或当来自氧气传感器的输出水平连续超过较高的第一水平两次时，可以确定氧传感器的激活状态，从而正确和快速地确定 可以获得氧传感器的激活状态。