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    • 7. 发明申请
    • Method of Purifying Exhaust Gas and Exhaust Gas Purification System
    • 净化废气和废气净化系统的方法
    • US20090183495A1
    • 2009-07-23
    • US12227931
    • 2007-05-14
    • Takao OnoderaNaofumi OchiShigeru IkedaTatsuo Mashiko
    • Takao OnoderaNaofumi OchiShigeru IkedaTatsuo Mashiko
    • F01N9/00F01N3/023F01N3/035
    • F01N3/0231F01N3/0235F01N3/035F01N9/002F01N13/0097F01N2250/02F01N2260/14F01N2430/085F01N2560/08F01N2900/0422F01N2900/08F01N2900/1606F02D41/029F02D41/08F02D2200/0812Y02T10/47
    • Even in the case of driving for a long time in the low rotation speed driving condition in which the exhaust flow rate is small and an estimation of the PM accumulated amount due to the pressure difference between the front and the back sides of a filter is difficult, the forced regeneration time can be accurately judged, the deterioration of fuel efficiency that is caused by excessive PM trapping can be avoided, and at the same time, thermal runaway that is generated by the excessive accumulated amount of PM and melting damage of the DPF due to this thermal runaway can be prevented. In the exhaust gas purification system 1 that performs a forced regeneration control by judging a forced regeneration starting time of the DPF 12b from the pressure difference ΔPm between the front and the back sides of the DPF 12b, in the case of detecting that the driving condition of the internal combustion engine 10 is a low rotation speed driving condition, the sustaining time tm of the low rotation speed driving condition is measured, and when the measured sustaining time tm exceeds the predetermined time for judgment tc, the forced regeneration control of the DPF 12b is performed without affecting the pressure difference ΔPm between the front and the back sides of the DPF 12b.
    • 即使在排气流量小的低转速行驶条件下长时间行驶,并且由于过滤器的前后侧之间的压力差导致的PM累积量的估计困难的情况 可以准确地判断强制再生时间,可以避免PM过量引起的燃油效率的劣化,同时由PM的过度累积量和DPF的熔融损伤产生的热失控 由于这种热失控可以防止。 在通过从DPF 12b的前侧和后侧之间的压力差ΔPm判断DPF 12b的强制再生开始时间来进行强制再生控制的排气净化系统1中,在检测到驱动条件 内燃机10的转速为低转速驱动条件时,测量低转速驱动条件的维持时间tm,并且当测量的维持时间tm超过用于判断的预定时间tc时,DPF的强制再生控制 执行12b而不影响DPF 12b的前侧和后侧之间的压力差ΔPm。