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    • 2. 发明授权
    • Diagnostic system for variable valve timing control system
    • 可变气门正时控制系统诊断系统
    • US5644073A
    • 1997-07-01
    • US656685
    • 1996-05-31
    • Osamu MatsunoKatsuhiko Kawamura
    • Osamu MatsunoKatsuhiko Kawamura
    • F02B77/08F01L1/34F01L13/00F02D13/02F02D41/22F02D45/00
    • F02D41/221F01L1/34F02D13/0215F02D13/0234F01L2201/00F02B2275/18F02D2041/001Y02T10/18
    • A diagnostic system makes a diagnosis on a variable valve timing control system mounted on an internal combustion engine by forcibly switching the valve timing control system from an operative state to an in operative state. The diagnostic system comprises sensors for detecting a variation of an operating state of an internal combustion engine, based on the forcible switching operation, and for detecting a throttle valve opening of the engine. The diagnostic system makes the diagnosis by comparing a variation of rate of flow of intake-air with a predetermined reference value to determine whether the valve timing control system operates normally or abnormally. The diagnostic system provides both a predetermined diagnostic preparatory period and a predetermined actual diagnostic period. The diagnostic system calculates a variation of the throttle valve opening, varied from the throttle valve opening detected at the beginning of the predetermined diagnostic preparatory period before the forcible switching operation, and inhibits the diagnosis of the valve timing control system when the variation of the throttle valve opening exceeds a predetermined threshold.
    • 诊断系统通过将气门正时控制系统从操作状态强制切换到工作状态来对安装在内燃机上的可变气门正时控制系统进行诊断。 诊断系统包括用于基于强制切换操作检测内燃机的运行状态的变化并且用于检测发动机的节气门开度的传感器。 诊断系统通过将进气量的流量变化与预定的参考值进行比较来确定是否正常或异常地运行气门正时控制系统。 诊断系统同时提供预定的诊断准备期和预定的实际诊断期。 诊断系统计算出在强制切换操作之前在预定诊断准备期间开始时检测到的节气门开度变化的节气门开度的变化,并且当节流阀的变化时,禁止气门正时控制系统的诊断 阀开度超过预定阈值。
    • 3. 发明授权
    • Air/fuel ratio control system for engine
    • 发动机空燃比控制系统
    • US5483945A
    • 1996-01-16
    • US209048
    • 1994-03-11
    • Masato KobayashiOsamu MatsunoYouichi KishimotoKatsuhiko Kawamura
    • Masato KobayashiOsamu MatsunoYouichi KishimotoKatsuhiko Kawamura
    • F02D45/00F02D41/14
    • F02D41/248F02D41/2445F02D41/2454F02D41/2483
    • A learning control system for controlling an air fuel ratio an engine employs a slowly updated second learning control variable in addition to a normally updated first learning control variable in order to utilize the learning function sufficiently even when a deviation of the air fuel ratio exceeds the learning range of the first variable. The control system according to an illustrated embodiment of the invention identifies a current engine operating area among a plurality of such areas, in accordance with a sensed engine operating condition, obtains a value of the first learning variable corresponding to the identified operating area, and a value of the second learning variable, determines a learning quantity which is a sum of the first and second learning variables by using the obtained values, and uses this learning quantity for determining a desired fuel supply quantity. The second learning variable is updated slowly whereas the first learning variable is updated in a sensitive and speedy manner.
    • 用于控制空燃比的学习控制系统除了通常更新的第一学习控制变量之外,还采用缓慢更新的第二学习控制变量,以便即使当空燃比的偏差超过学习时也能充分利用学习功能 第一个变量的范围。 根据本发明示出的实施例的控制系统根据所感测到的发动机操作条件识别多个这样的区域中的当前发动机操作区域,获得与所识别的操作区域相对应的第一学习变量的值,以及 第二学习变量的值通过使用获得的值来确定作为第一学习变量和第二学习变量的和的学习量,并且使用该学习量来确定期望的燃料供给量。 第二个学习变量被缓慢地更新,而第一个学习变量以敏感和快速的方式更新。
    • 4. 发明授权
    • Diagnosis for EGR system
    • EGR系统诊断
    • US06453734B1
    • 2002-09-24
    • US09290885
    • 1999-04-14
    • Saburo TomikawaKatsuhiko KawamuraOsamu Matsuno
    • Saburo TomikawaKatsuhiko KawamuraOsamu Matsuno
    • G01M1900
    • F02D41/221F02D21/08F02M26/49F02M26/57
    • An EGR system comprises a vacuum-operated EGR valve and an auxiliary valve of a diaphragm type for assisting the operation of the EGR valve. A diagnostic control unit monitors an engine rotational fluctuation parameter such as a misfire parameter under the condition of EGR and judges that there is a possibility of abnormality in the auxiliary valve when the fluctuation parameter is greater than a first judgment value. In response to this judgment, the diagnostic control unit forcibly cuts off the EGR and calculates the fluctuation parameter under the condition of EGR cutoff. The diagnostic control unit concludes that the auxiliary valve is abnormal when the fluctuation parameter in the EGR cutoff state is smaller than or equal to a second judgment value which is smaller than the first judgment value.
    • EGR系统包括真空操作的EGR阀和隔膜式的辅助阀,用于辅助EGR阀的操作。 诊断控制单元在EGR的条件下监视发动机旋转波动参数,例如失火参数,并且当波动参数大于第一判断值时判断辅助阀有异常的可能性。 响应于该判断,诊断控制单元强制切断EGR,并在EGR截止条件下计算出波动参数。 当EGR切断状态的波动参数小于或等于小于第一判断值的第二判断值时,诊断控制单元判断为辅助阀异常。
    • 5. 发明授权
    • Leak diagnosis system for evaporative emission control system
    • 蒸发排放控制系统泄漏诊断系统
    • US5408866A
    • 1995-04-25
    • US153516
    • 1993-11-17
    • Katsuhiko KawamuraOsamu MatsunoYoichi Kishimoto
    • Katsuhiko KawamuraOsamu MatsunoYoichi Kishimoto
    • F02M25/08F02M33/02G01M3/26
    • F02M25/0809
    • A leak diagnosis system which diagnoses a leak condition of an evaporative emission control system for an internal combustion engine. The leak diagnosis system detects a changing speed of a pressure in the evaporative emission control system for plural times during when the evaporative emission control system is put into a negative pressure condition by the negative pressure of the engine and is then closed by a purge-cut valve. The leak diagnosis system diagnoses a leak condition of the evaporative emission control system according to the detected plural pressure changing speeds while taking a fuel condition in the evaporative emission control system into consideration on the basis of the detected plural pressure changing speeds. Accordingly, the leak condition in the evaporative emission control system is accurately diagnosed without being effected by the fuel condition.
    • 一种用于诊断内燃机的蒸发排放控制系统的泄漏状况的泄漏诊断系统。 泄漏诊断系统在蒸发排放控制系统通过发动机的负压进入负压状态期间,在蒸发排放控制系统中检测压力的变化速度多次,然后通过吹扫切断 阀。 泄漏诊断系统根据检测到的多个压力变化速度,在根据检测出的多个压力变化速度考虑蒸发排放控制系统中的燃料条件的同时,对蒸发排放控制系统的泄漏状况进行诊断。 因此,蒸发排放控制系统的泄漏状况被准确地诊断而不受燃料条件的影响。