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。

公开(公告)号：US5056491A

公开(公告)日：1991-10-15

申请号：US504252

申请日：1990-04-04

申请人： Keisuke Tsukamoto

发明人： Keisuke Tsukamoto

IPC分类号： F02D41/04 ,  F02D41/10

CPC分类号： F02D41/10 ,  F02D41/045

摘要： An air-fuel ratio control system in an internal combustion engine, whereby an acceleration condition is detected to obtain an enrichment correction of a fuel injection amount. An occurrence of a mild acceleration is detected by calculating a value of a rate of change in a parameter of an engine load, such as a degree of opening of a throttle value, between adjacent timings, accumulating values of the rate of change of the engine load parameter during a sampling period, and comparing the accumulated value with a predetermined threshold value.

摘要翻译： 一种内燃机中的空燃比控制系统，由此检测加速条件以获得燃料喷射量的浓缩校正。 通过计算相邻定时之间的发动机负荷的参数（例如节气门值的打开程度）的变化率的值，累积发动机的变化率的值来检测轻度加速度的发生 在采样周期中的负载参数，以及将累积值与预定阈值进行比较。