| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve accumulation quantity estimation accuracy in an exhaust emission control device estimating accumulation quantity of exhaust gas fine particle to a collector by using both of a differential pressure formula and an operation history formula. <P>SOLUTION: In the exhaust emission control device, estimation of accumulation quantity by differential pressure formula is defined by a formula 1: M(i)=M(i-1)+(Mact(i)-M(i-1))/C. Namely, when value of accumulation quantity calculated based on differential pressure is defined as differential pressure formula accumulation quantity actual measurement value Mact, a value subtracting previous differential pressure formula accumulation quantity estimation value M(i-1) from latest differential pressure formula accumulation quantity actual measurement value Mact(i) is defined as differential pressure formula accumulation increase valueΔM, differential pressure formula accumulation increase valueΔM is corrected based on information during estimation period by preceding operation history formula (in embodiment, duration T) to calculate differential pressure formula accumulation increase correction valueΔMcor and differential pressure formula accumulation increase correction valueΔMcor is added to previous differential pressure formula accumulation quantity estimation value M(i-1) to calculate latest differential pressure formula accumulation quantity estimation value M(i). <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
