公开(公告)号：US20080271435A1

公开(公告)日：2008-11-06

申请号：US11869803

申请日：2007-10-10

申请人： Toshihiro AONO ,  Takahumi Ohwada ,  Akira Kiyomura ,  Masanobu Ohsaki ,  Seiichi Ohtani ,  Shigeo Ohkuma

发明人： Toshihiro AONO ,  Takahumi Ohwada ,  Akira Kiyomura ,  Masanobu Ohsaki ,  Seiichi Ohtani ,  Shigeo Ohkuma

IPC分类号： F01N3/00

CPC分类号： F01N11/007 ,  F01N2560/025 ,  F01N2900/0422 ,  F02D41/123 ,  F02D41/1456 ,  F02D41/1495 ,  Y02T10/47

摘要： A deterioration diagnosis system for an air fuel sensor mounted to an exhaust pipe of an internal combustion engine. The air fuel sensor determines a mixture ratio of air and fuel fed into the internal combustion engine. In the system, an inclination of an output signal of the air-fuel ratio sensor is calculated; variance of the inclination is calculated; deterioration of the air-fuel ratio sensor is determined based on the variance of the inclination.

摘要翻译： 一种安装在内燃机的排气管上的空气燃料传感器的劣化诊断系统。 空气燃料传感器确定供给到内燃机的空气和燃料的混合比。 在该系统中，计算空燃比传感器的输出信号的倾斜度; 计算倾斜的方差; 基于倾斜的变化来确定空燃比传感器的劣化。

公开(公告)号：US07146972B2

公开(公告)日：2006-12-12

申请号：US11227916

申请日：2005-09-16

申请人： Shigeo Ohkuma

发明人： Shigeo Ohkuma

IPC分类号： F02D41/14

CPC分类号： F02D41/1496 ,  F02D41/064 ,  F02D41/1455

摘要： An air fuel ratio control system includes an exhaust gas sensor to sense an oxygen concentration in an exhaust passage of an internal combustion engine, and a controller. The controller is configured to judge that the exhaust gas sensor is in an active state, by monitoring a decrease of an output of the exhaust gas sensor from a level greater than a first predetermined value, to a level smaller than or equal to the predetermined first predetermined value, and to allow the air fuel ratio control when the exhaust gas sensor is judged to be in the active state.

公开(公告)号：US20050139491A1

公开(公告)日：2005-06-30

申请号：US11019224

申请日：2004-12-23

申请人： Shigeo Ohkuma

发明人： Shigeo Ohkuma

IPC分类号： G01N27/409 ,  B62K11/00 ,  G01N27/26 ,  G01N27/406 ,  G01N27/407

CPC分类号： G01N27/4065 ,  G01N27/4071

摘要： In an oxygen concentration detecting apparatus for measuring an electromotive force produced in correspondence to a difference between the oxygen partial pressure of a standard electrode and the oxygen partial pressure of a measuring electrode by applying a voltage between the standard electrode and the measuring electrode, when an oxygen excessive state or a high temperature state of a detecting element continues for at least a predetermined time, the voltage applied between the standard electrode and the measuring electrode or a heater voltage is reduced.

摘要翻译： 在氧浓度检测装置中，通过在标准电极和测量电极之间施加电压来测量与标准电极的氧分压之差和测量电极的氧分压之间产生的电动势，当 氧过量状态或检测元件的高温状态持续至少预定时间，施加在标准电极和测量电极之间的电压或加热器电压降低。

公开(公告)号：US06769422B2

公开(公告)日：2004-08-03

申请号：US10160124

申请日：2002-06-04

申请人： Shigeo Ohkuma

发明人： Shigeo Ohkuma

IPC分类号： F02D4114

CPC分类号： F02D41/148 ,  F02D41/1454 ,  F02D41/187 ,  F02D2200/0404 ,  F02D2200/501

摘要： When an output signal from an oxygen sensor is within a predetermined range including a value equivalent to a stoichiometric air-fuel ratio, the output signal is converted into air-fuel ratio data, to compute an air-fuel ratio control signal based on a deviation between the air-fuel ratio data and a target air-fuel ratio. When the output signal from the oxygen sensor is outside the predetermined range, it is judged based on the output signal whether an actual air-fuel ratio is richer or leaner than the target air-fuel ratio, to compute the air-fuel ratio control signal based on the judgment result.

摘要翻译： 当来自氧传感器的输出信号在包括等于理论空燃比的值的预定范围内时，输出信号被转换成空燃比数据，以基于偏差计算空燃比控制信号 在空燃比数据和目标空燃比之间。 当来自氧传感器的输出信号超出预定范围时，根据输出信号判断实际空燃比是否比目标空燃比更浓或更稀，以计算空燃比控制信号 根据判断结果。