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    • 5. 发明授权
    • Internal combustion engine with evaporated fuel purge system
    • 具有蒸发燃料净化系统的内燃机
    • US5284121A
    • 1994-02-08
    • US917209
    • 1992-07-22
    • Seiko AbeToshihiko IgashiraYasuyuki Sakakibara
    • Seiko AbeToshihiko IgashiraYasuyuki Sakakibara
    • F02D41/02F02D41/00F02D41/04F02M25/08F02M37/04
    • F02D41/0045F02M25/08F02M25/0836F02D41/0042
    • An internal combustion engine has an evaporated fuel purge system for directly feeding evaporated fuel of a fuel tank into an intake pipe of the engine during the engine is running. This system comprises a purge control valve for opening or closing a flow line which connects an upper space of the fuel tank with the intake pipe, a controller for controlling the operation of the valve, a throttle section formed in series with the purge control valve, and pressure and temperature sensors which are located on the upstream side of the throttle section for detecting a pressure and a temperature of the evaporated fuel. When a value detected by the pressure sensor exceeds a predetermined value of pressure for providing a critical pressure ratio at which a flow rate of the evaporated fuel at the throttle section substantially equals to a sonic velocity, the controller opens the purge control valve to cause a purged flow of the evaporated fuel whose flow rate is constant. Simultaneously, the controller calculates a purged flow rate of the evaporated fuel from the detected values of the pressure and temperature sensors and a time period during which the purge control valve is opened. On the basis of the calculated purged flow rate, a reduction correction is made to an amount of the fuel to be supplied to the engine in order to maintain an air-fuel ratio in the optimum condition. The calculated purged flow rate may be indicated.
    • 内燃机具有蒸发的燃料净化系统,用于在发动机运行期间将燃料箱的蒸发燃料直接进入发动机的进气管。 该系统包括用于打开或关闭连接燃料箱的上部空间与进气管的流路的清洗控制阀,用于控制阀的操作的控制器,与清洗控制阀串联形成的节流部, 以及压力和温度传感器,其位于节流部分的上游侧,用于检测蒸发燃料的压力和温度。 当由压力传感器检测到的值超过预定的压力值,以提供临时压力比时,节流部分处的蒸发燃料的流量基本上等于声速,则控制器打开净化控制阀,使得 吹扫流量恒定的蒸发燃料。 同时,控制器根据压力和温度传感器的检测值以及清洗控制阀打开的时间段来计算蒸发燃料的净化流量。 基于所计算的净化流量,为了将空燃比维持在最佳状态,对要供给到发动机的燃料的量进行减小修正。 可以指示计算的净化流速。