Search Results

An oxidation catalyst for diesel engines has been tested in the North American market with proven satisfactory initial performance and durability tests of vehicles but has yet to be evaluated by its bench durability tests due to shorter test duration. Therefore, the oxidation catalyst, durability tested by vehicle and bench, was subjected and the test data were analyzed to clarify its degradation mechanism and set up outlooks for evaluation of its durability by bench tests.

For meeting more stringent regulations to be imposed for reducing particulate matter (PM) in exhaust gas from diesel engines, it is required to improve performance of a trap system or other post-processing devices as well as fuel combustion efficiency of the engine itself. In the trap system, a trap filter is equipped to collect PM from exhaust gas. For continuous use of the trap filter, a regenerative processing must be carried out to remove PM by means of forced burning when a certain amount of PM has been trapped. The combustibility or burning characteristics of collected PM have a significant effect on the regenerative processing with an electric heater/burner. To clarify the combustibility of PM collected in the trap filter, we have examined the relationships between engine drive conditions (exhaust gas temperature), PM characteristics, and combustibility.