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    • 2. 发明授权
    • Methodology of robust initialization of catalyst for consistent oxygen storage capacity measurement
    • 稳定的初始化催化剂的方法,用于一致的储氧能力测量
    • US06631611B2
    • 2003-10-14
    • US09867977
    • 2001-05-30
    • Guojun ShiSharanjit SinghMinghui KaoDavid W. Dempsey
    • Guojun ShiSharanjit SinghMinghui KaoDavid W. Dempsey
    • F01N300
    • F01N11/007F01N11/00F01N2550/02F01N2900/0422F02D41/003F02D41/1441F02D41/1474F02D41/1475F02D41/1495F02D41/187F02D41/2454F02D2200/0816F02M26/15F02P9/005Y02T10/47
    • A method of initializing the catalyst converter for monitoring the conversion efficiencies of a catalytic converter by measuring the oxygen storage capacity (OSC) of the converter. The measurement of the OSC indicates the degree of health of the converter. Under the same engine running conditions, the greater the OSC measurement, the healthier the converter. The catalyst needs to be set to either a rich state or a lean state prior to the measurement of its OSC time. This process is called catalyst state initialization. The catalyst has to be fully saturated from test to test in order to make consistent OSC measurements. This is through open loop fuel control by commanding a lean air to fuel ratio and then monitoring thepost-O2 sensor voltage until it falls below a calibrated value (e.g. 80 mV) indicating a lean state. The system continues to command a lean air to fuel ratio (e.g. 6%) for a calibrated duration of time (e.g. 3 seconds) to saturate the catalytic converter and drive it to a fixed saturation state. This ensures consistent OSC measurement in the second stage of the test.
    • 一种初始化催化剂转化器的方法,用于通过测量转化器的储氧容量(OSC)来监测催化转化器的转化效率。 OSC的测量值表示转换器的健康程度。 在相同的发动机运行条件下,OSC测量越大,转换器越健康。 在测量OSC时间之前,需要将催化剂设定为富状态或稀态。 这个过程称为催化剂状态初始化。 催化剂必须从试验完全饱和才能进行一致的OSC测量。 这是通过指挥稀空燃比的开环燃料控制,然后监测氧气传感器电压,直到它低于指示稀薄状态的校准值(例如80mV)。 系统在校准的持续时间(例如3秒)内继续命令稀空燃比(例如6%),以使催化转化器饱和并将其驱动到固定饱和状态。 这样可以在测试的第二阶段确保OSC测量的一致性。