Jorg Abthoff

The Regenerable Trap Oxidizer-An Emission Control Technique for Diesel Engines

The paper examines the work carried out by Daimler-Benz with the development of systems for the after-treatment of the exhaust gas emitted by diesel engines. The more important limiting conditions could best be met by the provision of a ceramic, self-cleaning trap oxidizer (to). In such filters, self-regeneration is effected continuously while driving without any external control. Either partial or complete regeneration is effected, depending on the temperature, oxygen content and rate of flow of the exhaust gas, the amount of soot in the filter and the period for which a given operating condition is maintained. Such a trap oxidizer was developed for a 3.0 liter turbocharged diesel engine to the extent necessary for series production and has been fitted to type 300 SD and 300 D turbocharged diesel of model year 1985 in California. For the covering abstract see IRRD 287303.

DAIMLER-BENZ 2.3 LITRE, 16-VALVE HIGH-PERFORMANCE ENGINE

Daimler-Benz has developed a high performance version of the proven 2.3-litre, 4-cylinder, M102 gasoline engine for the 190E 2.3-16 sport sedan which incorporates a number of the most advanced design features, including a light-alloy cross-flow cylinder head with dual overhead camshafts and four valves per cylinder, roof-shaped combustion chambers with centrally located spark plugs, electronically/mechanically controlled fuel injection system with air by-pass at the injection valves, electronically controlled ignition and idle speed, and a single poly V-belt drive. These elements resulted in an engine with high torque and high horsepower over the entire rpm range and which still offers favorable fuel consumption at the same time. The engine with its 10.5:1 compression ratio also meets ECE 15/04 emission regulations.

Development of Canistering Systems for Monolithic Catalysts

The paper covers the description of two different canister systems for monolithic catalysts. The first version is an underhood system fitted directly to the exhaust manifold. The second version is a ceramic wrapping canister system developed for an underfloor catalyst configuration.