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    • 5. 发明授权
    • Method and apparatus for detecting abnormal state of evaporative
emission-control system
    • 用于检测蒸发排放控制系统的异常状态的方法和装置
    • US5203870A
    • 1993-04-20
    • US721687
    • 1991-06-26
    • Nobuaki KayanumaKenichi UchidaTakayuki Otsuka
    • Nobuaki KayanumaKenichi UchidaTakayuki Otsuka
    • F02M25/08
    • F02M25/0809F02M2025/0845
    • In an evaporative emission-control system having a canister for trapping a fuel-vapor evaporated from the fuel tank and a purge control valve for executing a purging, an amount of fuel-vapor trapped in the canister is measured while the engine is stopped or in an idle state. The trapped fuel-vapor is purged from the canister and mixed with an air-fuel mixture when the amount of fuel-vapor trapped in the canister is sufficient for diagnosis while the vehicle is running in a predetermined driving condition. In this purge operation, a concentration of a vapor-laden air from the canister is measured and the occurrence of an abnormal state of the evaporative emission-control system is determined when a change of the concentration of the vapor-laden air after the purging is less than a predetermined value.
    • 在具有用于捕集从燃料箱蒸发的燃料蒸汽的罐的蒸发排放控制系统和用于执行清洗的清除控制阀的情况下,在发动机停止时或者在发动机停止时测量捕集在罐中的燃料 - 蒸汽的量 空闲状态。 当车辆在预定的行驶状态下行驶时,捕集在罐中的燃料 - 蒸汽的量足以用于诊断时,将捕获的燃料蒸气从罐中吹扫并与空气 - 燃料混合物混合。 在这种吹扫操作中,测量来自罐的蒸气的空气的浓度,并且当吹扫之后的蒸汽负载的空气的浓度的变化是蒸发排放控制系统的异常状态时,确定发生异常状态 小于预定值。