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    • 1. 发明授权
    • Combustion state-detecting system for internal combustion engines
    • 内燃机燃烧状态检测系统
    • US5493901A
    • 1996-02-27
    • US120832
    • 1993-09-15
    • Shigetaka KurodaYuichi ShimasakiKazutomo Sawamura
    • Shigetaka KurodaYuichi ShimasakiKazutomo Sawamura
    • F02D45/00F02B75/02G01M15/11G01M15/00
    • G01M15/11F02B2075/027
    • A combustion state-detecting system for internal combustion engines has a crank angle sensor which generates a crank angle signal with a predetermined period shorter than a firing period of the engine whenever the crankshaft rotates through a predetermined angle. A value of the rotational speed of the engine is detected whenever the crank angle signal is generated. A first average value of the detected engine rotational speed is calculated over every period of one rotation of the crankshaft, followed by calculating a second average value of the first average value over every firing period, to thereby calculate a rate of variation in the second average value over every firing period. Values of the rate of variation are averaged over a predetermined number of ignition cycles of the engine, to obtain a third average value. A cumulative value of the absolute value of a difference between the third average value and the rate of variation is calculated over the above predetermined number of ignition cycles. The cumulative value is compared with a predetermined value, to determine that the engine is in a degraded state of combustion, when the cumulative value exceeds the predetermined value.
    • 用于内燃机的燃烧状态检测系统具有曲柄角传感器,其在曲轴旋转预定角度时产生具有比发动机的燃烧时间短的预定时间段的曲柄角信号。 每当产生曲轴转角信号时,检测发动机转速的值。 在曲轴的一个旋转周期中计算检测到的发动机转速的第一平均值,然后计算每个点火期间的第一平均值的第二平均值,从而计算第二平均值的变化率 每个发射期间的价值。 在发动机的预定数量的点火循环中平均变化率的值,以获得第三平均值。 在上述预定数量的点火循环中计算第三平均值和变化率之差的绝对值的累积值。 当累积值超过预定值时,将累积值与预定值进行比较,以确定发动机处于劣化的燃烧状态。
    • 10. 发明授权
    • Combustion state-detecting system for internal combustion engines
    • 内燃机燃烧状态检测系统
    • US5390537A
    • 1995-02-21
    • US149913
    • 1993-11-10
    • Shigetaka KurodaKenichi MaedaKazutomo SawamuraHiroshi Maruyama
    • Shigetaka KurodaKenichi MaedaKazutomo SawamuraHiroshi Maruyama
    • F02D45/00G01M15/11G01M15/00
    • G01M15/11
    • A combustion state-detecting system for internal combustion engines has a crank angle sensor which generates a crank angle signal with a predetermined period shorter than a firing period of the spark plug whenever the crankshaft rotates through a predetermined angle. A value of the rotational speed of the engine is detected whenever the crank angle signal is generated. A rate of variation in the detected value of the rotational speed of the engine is calculated over the firing period of the spark plug, and an average value thereof is then calculated. The calculated average value of the variation rate is compared with the calculated variation rate, and a cumulative value of a difference between the calculated variation rate average value and the calculated variation rate is calculated when the calculated variation rate is on the larger deceleration side of the engine rotational speed with respect to the calculated variation rate average value. The calculated difference cumulative value is compared with a predetermined value to determine whether or not the engine is in a degraded combustion state, based on the comparison result.
    • 用于内燃机的燃烧状态检测系统具有曲柄角传感器,每当曲轴旋转预定角度时,其产生比火花塞的燃烧时间短的预定时段的曲柄角信号。 每当产生曲轴转角信号时,检测发动机转速的值。 在火花塞的点火期间计算发动机的转速的检测值的变化率,然后计算其平均值。 将所计算的变化率的平均值与计算出的变化率进行比较,计算出的变化率平均值与计算出的变化率之差的累计值,在计算出的变化率在 发动机转速相对于计算的变化率平均值。 将计算的差分累计值与预定值进行比较,以基于比较结果来确定发动机是否处于劣化燃烧状态。