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    • 5. 发明公开
    • Exhaust gas purification system for an internal combustion engine
    • 内燃机废气净化系统
    • EP0497034A1
    • 1992-08-05
    • EP91307021.5
    • 1991-07-31
    • TOYOTA JIDOSHA KABUSHIKI KAISHA
    • Nomura, HiroshiHirose, KatsuhikoKotani, TakeshiMatsushita, SouichiNakanishi, KiyoshiOhno, EishiNomura, Kenichi
    • F01N3/20F02M69/08F01N9/00
    • F02M51/0617F01N3/20F01N13/009F01N2370/04F01N2430/00F01N2430/06F01P7/167F01P2007/146F01P2025/08F01P2025/60F02B1/04F02D35/00F02M69/08
    • An exhaust gas purification system for an internal combustion engine includes an engine (2, 2A, 2B, 2C, 2D, 2E) capable of fuel combustion at lean air-fuel ratios, a catalyst (18, 18A, 4B, 4C, 6D, 6E) constructed of zeolite carrying at least one kind of metal selected from transition metals and noble metals to reduce NOx under oxidizing conditions and in the presence of HC, engine operating condition detecting means for detecting the current engine operaing condition, engine operating range determining means (104, 106, 216, 218, 104A, 204B, 102C-112C, 202C, 103D, 104D, 106D, 202D, 103E, 104E, 106E, 202E) for determining whether or not the current engine operating condition is within an insufficient HC amount range, and an HC amount control means (108, 110, 220, 222, 108A, 206B, 113C, 114C, 203C, 204C, 105D, 107D-112D, 203D, 208D, 105E, 107E-109E, 203E, 204E) for controlling the amount of HC included in the exhaust gas when the engine operating range determining means determines that the engine operating condition is within the insufficient HC amount range. The HC amount control means degrades atomization or evaporation of fuel injected from a fuel injection valve to thereby generate unburned fuel and to increase the HC amount in the exhaust gas, so that the NOx purification rate of the catalyst is improved.
    • 一种用于内燃机的排气净化系统包括:能够以稀空燃比燃料燃烧的发动机(2,2A,2B,2C,2D,2E),催化剂(18,18A,4B,4C,6D, 6E),其由在氧化条件下和HC存在下负载选自过渡金属和贵金属中的至少一种金属以还原NO x的沸石构成;发动机工况检测装置,用于检测当前发动机工况;发动机工作范围确定装置 (104,106,216,218,104A,204B,102C-112C,202C,103D,104D,106D,202D,103E,104E,106E,202E),用于确定当前的发动机工况是否在不足的HC HC量控制单元(108,110,220,222,108A,206B,113C,114C,203C,204C,105D,107D-112D,203D,208D,105E,107E-109E,203E,204E) 用于当发动机工作范围确定装置确定该时间时控制包含在排气中的HC的量 发动机运转状态在HC量不足的范围内。 HC量控制装置降低从燃料喷射阀喷射的燃料的雾化或蒸发,从而产生未燃烧的燃料并增加排气中的HC量,从而提高催化剂的NOx净化率。