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The Institute for Mechanical Engineering Design of the Technical University Hamburg-Harburg is developing a product model based tool for application engineering of hydrostatic systems, which supports the early stages of product design. To guarantee that all employees of the company have access to product data and design knowledge via Intranet the tool is WEB-based. Increased data processing support especially in the early stages of product development requires computer supported acquisition of the task, which is offered by the tool. Additionally different modules support the solution identification process by supplying design experience and giving access to realized solutions. Circuit diagram creation, selection of components, system simulation, error estimation and 3D-layout of the hydrostatic system are also supported by the tool.

The present paper describes the results of a joint development program focussing on a system approach to meet the EURO IV emission standards for an upper class passenger car equipped with a newly developed high displacement gasoline engine. Based on the well known catalyst systems of recent V6- and V8-engines for the EURO III emission standards with a combination of close coupled catalysts and underfloor catalysts, the specific boundary conditions of an engine with an even larger engine displacement had to be considered. These boundary conditions consist of the space requirements in the engine compartment, the power/torque requirements and the cost requirements for the complete aftertreatment system. Theoretical studies and computer modeling showed essential improvements in catalyst performance by introducing thin wall substrates with low thermal inertia as well as high cell densities with increased geometric surface area.