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    • 122. 发明授权
    • Air-fuel ratio control system of internal combustion engine
    • 内燃机空燃比控制系统
    • US4697567A
    • 1987-10-06
    • US772888
    • 1985-09-05
    • Hiroshi SawadaToshimi Murai
    • Hiroshi SawadaToshimi Murai
    • F02D41/00F02D41/12F02D41/14
    • F02D41/1488F02D41/123
    • An air-fuel ratio control system for an internal combustion engine. Excessive fuel supplying at fuel cut reset time is avoided, by interrupting the fuel supply when a fuel cut control signal is being output. An amount of fuel cut time during which the fuel cut control signal is output is determined, and a hold time is also determined. This hold time corresponds to an amount of time necessary for combustion gas to reach a feedback sensor, and be included in the feedback control signal, after termination of the fuel cut. A feedback or closed loop system is used during normal operations. An open loop control signal is used during fuel cut time, and for a period of time equivalent to the value of the hold time after the end of this fuel cut time. Therefore, open loop control is used until exhaust gases have again reached the feedback sensor so that feedback or closed loop control can thereafter be used.
    • 一种用于内燃机的空燃比控制系统。 通过在输出燃料切断控制信号时中断燃料供应,避免燃料切断复位时间过度燃料供给。 确定输出燃料切断控制信号的燃料切断时间量,并且还确定保持时间。 该保持时间对应于燃烧气体到达反馈传感器所需的时间量,并且在燃料切断终止之后被包括在反馈控制信号中。 在正常操作期间使用反馈或闭环系统。 在燃料切断时间期间使用开环控制信号,并且在与该燃料切断时间结束后的保持时间的值相当的时间段内使用。 因此,使用开环控制,直到废气再次到达反馈传感器,从而可以使用反馈或闭环控制。
    • 123. 发明授权
    • Engine mixture control system controlling primary and secondary air-fuel
mixtures
    • 发动机混合控制系统控制一级和二级空气 - 燃料混合物
    • US4385491A
    • 1983-05-31
    • US221889
    • 1980-12-31
    • Kazuhiro SakuraiHiroshi SawadaKyo Hattori
    • Kazuhiro SakuraiHiroshi SawadaKyo Hattori
    • F01N3/22F02D37/00F02D41/14F02D43/00F02M7/24
    • F01N3/222F01N3/22F02D37/00F02D41/1482F02D41/1491F02M7/24
    • An internal combustion engine includes an intake system, an exhaust system, and a mixture supply device which supplies primary fuel-air mixture into the intake system. An oxygen sensor assembly detects oxygen concentration at a certain point in the exhaust system and produces a first electrical signal which represents this concentration. A secondary air flow control circuit receives this first electrical signal and produces a second electrical signal according thereto. A secondary air supply system feeds secondary air into the exhaust system upstream of the aforementioned certain point at a flow rate controlled by the second electrical signal. A primary air/fuel ratio correction circuit receives either the first or the second electrical signal and based on it produces a primary mixture control electrical signal. This primary mixture control electrical signal is received by a mixture control system, which alters the primary air/fuel ratio of the mixture provided by the mixture supply device in accordance therewith.
    • 内燃机包括进气系统,排气系统和将主要燃料 - 空气混合物供应到进气系统中的混合供应装置。 氧传感器组件检测排气系统中某一点处的氧气浓度,并产生表示该浓度的第一电信号。 第二气流控制电路接收该第一电信号并根据其产生第二电信号。 二次空气供给系统以由第二电信号控制的流量将二次空气供给到上述特定点的上游的排气系统。 主空气/燃料比校正电路接收第一或第二电信号,并且基于它产生主混合控制电信号。 该混合控制电信号被混合物控制系统接收,混合物控制系统改变由混合物供应装置提供的混合物的一次空气/燃料比。
    • 126. 发明授权
    • Air-fuel ratio imbalance among cylinders determining apparatus for a multi-cylinder internal combustion engine
    • 用于多缸内燃机的气缸确定装置之间的空燃比不平衡
    • US08903625B2
    • 2014-12-02
    • US13133044
    • 2008-12-05
    • Toru KidokoroHiroshi SawadaYasushi IwazakiFumihiko Nakamura
    • Toru KidokoroHiroshi SawadaYasushi IwazakiFumihiko Nakamura
    • G06F7/00F02D41/00F02D41/14
    • F02D41/1441F02D41/0085F02D2041/1418
    • A judging device comprises a catalyst, an upstream air/fuel ratio sensor having an air/fuel ratio sensing element covered with a diffusion resistance layer, and a downstream air/fuel ratio sensor. The judging device performs main feedback control to equalize the air/fuel ratio indicated by the output value of the upstream air/fuel ratio sensor to an upstream target air/fuel ratio and sub-feedback control to equalize the output value of the downstream air/fuel ratio sensor to a downstream target value. The judging device acquires “an imbalance judging parameter” which increases with “the increase of the difference between the amount of hydrogen contained in the exhaust gas before the exhaust gas passes through the catalyst and that after the exhaust gas passes through the catalyst” according to the sub-feedback amount. When the imbalance judging parameter is larger than an abnormality judgment threshold, the judging device judges that an air/fuel ratio imbalance among the cylinders has occurred. The judging device does not make judgment on air/fuel ratio imbalance among the cylinders if a predetermined judgment prohibition condition is satisfied, for example, if the flow of the exhaust gas is a predetermined value or more.
    • 判断装置包括催化剂,具有覆盖有扩散电阻层的空气/燃料比感测元件的上游空燃比传感器和下游空气/燃料比传感器。 判断装置执行主反馈控制,以将由上游空燃比传感器的输出值表示的空燃比与上游目标空燃比和副反馈控制进行平衡,以使下游空气/燃料比传感器的输出值相等, 燃料比传感器到下游目标值。 判断装置获取“不平衡判定参数”,其随着“排气通过催化剂之前的排气中所含的氢的量与废气通过催化剂之后的氢气的差异的增加”增加,根据 子反馈量。 当不平衡判定参数大于异常判断阈值时,判断装置判断出气缸之间的空气/燃料比不平衡发生。 如果满足预定的判定禁止条件,例如如果排气的流量为预定值以上,则判断装置不判断气缸之间的空气/燃料比不平衡。
    • 129. 发明授权
    • Air-fuel ratio imbalance among cylinders determining apparatus for an internal combustion engine
    • 用于内燃机的气缸确定装置之间的空燃比不平衡
    • US08452517B2
    • 2013-05-28
    • US13382079
    • 2009-07-02
    • Hiroshi SawadaFumihiko NakamuraHiroshi MiyamotoYasushi Iwazaki
    • Hiroshi SawadaFumihiko NakamuraHiroshi MiyamotoYasushi Iwazaki
    • G01M15/10F02D41/00F02D41/14
    • F02D41/0085F02D41/1454F02D2400/18
    • An air-fuel ratio imbalance among cylinders determining apparatus according to the present invention comprises an air-fuel ratio sensor having a protective cover and an air-fuel ratio detection element accommodated in the protective cover, and imbalance determining means. The imbalance determining means obtains a detected air-fuel ratio abyfs based on an output Vabyfs of the air-fuel ratio sensor every elapse of a constant sampling time ts, and obtains, as an indicating amount of air-fuel ratio change rate, a difference (detected air-fuel ratio change rate ΔAF) between a present detected air-fuel ratio abyfs which is newly detected and a previous air-fuel ratio abyfsold which was detected the sampling time ts ago, an average of the detected air-fuel ratio change rate ΔAF, and the like. The imbalance determining means determines that the air-fuel ratio imbalance among cylinders state is occurring, when a magnitude of the indicating amount of air-fuel ratio change rate is larger than an imbalance determination threshold.
    • 根据本发明的气缸确定装置之间的空燃比不平衡包括具有保护盖和容纳在保护盖中的空燃比检测元件的空燃比传感器和不平衡确定装置。 不平衡确定装置根据空燃比传感器每经过一定采样时间ts的输出Vabyfs获得检测的空燃比abyfs,并且获得作为空燃比变化率的指示量的差 在检测到的新检测到的当前检测空燃比abyfs与检测出采样时间ts前的空燃比abyfsold之间的检测空燃比变化率ΔAF(检测空燃比变化率ΔAF),检测到的空燃比变化的平均值 速率DeltaAF等。 当空燃比变化率的指示量大于不平衡判定阈值时,不平衡确定装置确定气缸状态之间的空燃比不平衡发生。