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    • 4. 发明公开
    • EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE
    • 爱丁堡VERBRENNUNGSMOTOR ABGASREINIGUNGSVORRICHTUNG
    • EP2963261A4
    • 2016-11-16
    • EP14756582
    • 2014-02-18
    • ISUZU MOTORS LTD
    • UCHIYAMA TADASHIASO MITSUHIRONODA MASAFUMI
    • F01N3/20F01N3/023F01N3/025F01N3/029F01N3/031F01N3/035F01N3/08F01N3/36F01N9/00F01N13/00G01K7/00G01K13/00G05D23/00
    • F01N3/0253F01N3/035F01N3/2066F01N9/002F01N13/009F01N2240/04F01N2560/12F01N2570/14F01N2610/02F01N2610/03F01N2900/0601F01N2900/1602F01N2900/1626G01K2205/04Y02T10/24Y02T10/47
    • The invention relates to an exhaust gas purification device of an internal combustion engine that can improve NOx purification capability. The exhaust gas purification device includes a DPF (16) for capturing PM in an exhaust gas, a urea water spraying unit (21) for spraying urea water into the exhaust gas, an SCR (22) for reducing and purifying NOx in the exhaust gas, electrostatic capacity detecting units (17a, 17b, 41) for detecting the electrostatic capacity of the DPF (16), a DPF temperature estimating unit (43) for estimating the inside temperature of the DPF (16) based on the electrostatic capacity, and a regeneration controlling unit (44) for executing forced DPF (16) regeneration. A target lower limit temperature is defined as temperature to trigger PM combustion, and a target upper limit temperature is defined as temperature to avoid filter erosion. The regeneration controlling unit (44) executes the forced regeneration with an amount of fuel supplied for causing the inside temperature to reach the target lower limit temperature when the inside temperature is at or above the SCR activation temperature, and executes the forced regeneration with another amount of fuel supplied for causing the inside temperature to reach the target upper limit temperature when the inside temperature is below the SCR activation temperature.
    • 本发明涉及一种能够提高NOx净化能力的内燃机的废气净化装置。 废气净化装置包括:用于在排气中捕集PM的DPF(16),用于将尿素水喷射到废气中的尿素水喷射单元(21),用于减少和净化废气中的NOx的SCR(22) 用于检测DPF(16)的静电电容的静电电容检测单元(17a,17b,41),用于基于静电电容估计DPF(16)的内部温度的DPF温度估计单元,以及 用于执行强制DPF(16)再生的再生控制单元(44)。 目标下限温度定义为触发PM燃烧的温度,目标上限温度定义为避免过滤器侵蚀的温度。 再生控制单元(44)在内部温度为SCR活化温度以上时,以供给内部温度使内部温度达到目标下限温度的燃料量进行强制再生,并以另一个量执行强制再生 当内部温度低于SCR活化温度时,供应的燃料用于使内部温度达到目标上限温度。