Eduard Moser

Case study: system model of crane and embedded control

A case study of a crane is defined for the evaluation of system description languages. The plant (car and load) is given as a fourth-order linear system. The embedded control includes sensors, actuators, two control strategies, and diagnosis.

VHDL-AMS: the missing link in system design - experiments with unified modelling in automative engineering

After the IEEE ballot accepted the first draft language reference manual for VHDL-AMS (IEEE PAR 1076.1) in October 1997, we now can spend time and effort on applying the new arising methodology to real world problems outside the electronic domain. In automotive engineering we have system design problems dealing with hydraulic or mechanic components and their controlling units, for which we expect a major advantage by introducing unified modelling to all domains. With the Brite/EuRam-Project TOOLSYS (a joined effort of automotive industry and tool makers to apply VHDL-AMS as unified modelling language on mixed-domain applications) we prove the suitability as unified modelling and interchange language for real-world systems and components. First experiments with hydraulic components reveal numerical problems on analog circuit simulators. None of the available strategies for these particularly hard problems are included by the electronic simulator makers. With VHDL-AMS multi-domain modelling seems possible, now we need multi-domain simulation environments.

System specification experiments on a common benchmark

To contribute to the current effort toward the definition of a system-level design language, this article proposes a benchmark for system specification. The authors analyze the results of experiments using the benchmark with several languages.

Coupling of CAE Tools for Mixed Simulation of Multi-Domain Systems in Automotive Applications

Abstract This paper presents a methodology for coupling of two different Computer Aided Engineering software tools, in order to carry out simulations of complex systems that involve components of different nature, like hydraulics and mechanics. The VHDL-AMS language is used as a neutral format for model description and for transferring the models between tools. The methodology has been applied to an ABS braking system coupled to the mechanical model of a vehicle.