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    • 40. 发明授权
    • Exhaust emission control apparatus for combustion engine
    • 内燃机用废气排放控制装置
    • US06170260B2
    • 2001-01-09
    • US09151279
    • 1998-09-11
    • Hitoshi IshiiKimiyoshi Nishizawa
    • Hitoshi IshiiKimiyoshi Nishizawa
    • F01N300
    • F01N3/0835F01N3/0814F01N13/009F01N2510/0682F01N2510/0684F02D41/024F02D41/027F02P5/1506Y02T10/26Y02T10/42Y02T10/46
    • Exhaust gas due to combustion is discharged into the atmosphere through a combined catalytic-hydrocarbon adsorbent 20. The combined catalytic-hydrocarbon adsorbent consists of a hydrocarbon adsorbent layer 20A and a three-way catalytic layer 20B. The hydrocarbon adsorbent layer 20A adsorbs hydrocarbons at a lower temperature, and desorbs hydrocarbons at a higher temperature. The three-way catalytic layer 20B purifies hydrocarbons desorbed from the hydrocarbon adsorbent layer 20A. To reduce the amount of hydrocarbons discharged to atmosphere, when the running condition of the engine is in the idling region, the ignition timing is retarded. This retarding of the ignition timing is limited to the time period after the hydrocarbon adsorbent layer 20A begins desorbing hydrocarbons until three-way catalytic layer 20B activates. With this design, the temperature of the combined catalyst-hydrocarbon adsorbent rises rapidly and the amount of hydrocarbon emission is controlled to be minimum.
    • 由燃烧产生的废气通过组合的催化烃吸附剂20排放到大气中。组合的催化烃吸附剂由烃吸附剂层20A和三元催化剂层20B组成。 烃吸附剂层20A在较低温度下吸附碳氢化合物,并在较高温度下解吸烃。 三元催化层20B净化从烃吸附层20A脱附的烃。 为了减少排放到大气中的碳氢化合物的量,当发动机的运转状态处于怠速区域时,点火正时被延迟。 点火正时的这种延迟被限制在烃类吸附剂层20A开始解吸碳氢化合物直到三元催化剂层20B活化之后的时间段。 通过这种设计,组合催化剂 - 烃类吸附剂的温度迅速上升,碳氢化合物排放量控制在最小。