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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.

Commercial Heavy vehicles (CHVs) are an efficient and reliable link between marine, railroad, and air transportation nodes. The vehicle braking power imposes an important constraint in the allowable vehicle speed. The compression brake augments the vehicle retarding power and is currently typically used as an on-off device by experienced drivers. Hardware and software advances allow modulation of the compression brake power through variable valve timing, and thus, enable integration of the compression brake with service brakes. To analyze how much the compression brake affects vehicle speed during braking, we develop a crank angle engine model that describes the intrinsic transient interactions between individual cylinder intake and exhaust gas process, turbocharger dynamics, and vehicle dynamics during combustion and variable brake valve timing. The model is validated using experimental data.