| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve following problems: a diesel engine causes increase in an amount of HC emission due to occurrence of HC caulking, occurrence of oil dilution, and decrease in fuel efficiency. <P>SOLUTION: A zeolite catalyst 32, an oxidation catalyst 34, and a DPF filter device 38 are provided in order from an upstream side in an exhaust pipe 18 of an on-board direct-injection diesel engine 10; an oxygen concentration sensor 26 and an exhaust temperature sensor 30 are provided in an inlet of the zeolite catalyst 32; and an exhaust temperature sensor 36 is provided in an outlet of the oxidation catalyst 34. The amount of HC emission of the oxidation catalyst 34 is estimated from a correlation map of an inlet exhaust temperature of the zeolite catalyst 32 and the amount of HC adsorption of the zeolite catalyst 32, and a difference ΔT between detection values of the exhaust temperature sensors 30 and 36. The amount of HC emission is utilized for post-injection to enable a reduction in the actual amount of post-injection. <P>COPYRIGHT: (C)2013,JPO&INPIT |
