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Cam phasing, or Variable Valve Timing (VVT), is an electro hydraulic and mechanical camshaft control concept managed by the vehicle's microcontroller engine management system. Development and implementation of cam phasing mechanisms is pursued by the automotive industry today because it gives measurable increase in performance, and reduction in undesired engine emissions. This paper illustrates the usage of virtual prototyping techniques to efficiently investigate cam phasing architecture control algorithm implementation to permit more robust cam phasing design. The control algorithm implementation resides in Simulink, and the virtual prototype of a complete hydraulic vane cam phaser system resides in a selected analog mixed technology simulator. Co-simulation enables the two different simulation engines to communicate, hence dynamic controller development can commence against virtual hardware. Cam phaser response is heavily dependent on engine oil temperature and pressure.

An electronically controlled hydraulic pressure regulator, that could be used in an automotive or aircraft “brake-by-wire” system, is analyzed using the Saber® Simulator. The design incorporates electrical, mechanical and hydraulic elements. The entire dynamic system is modeled, including the interactions between the hydraulic and electrical components. Sensitivity analysis is used to identify key parameters affecting performance, and stress analysis indicates components that are operating near or above rated values. These simulation techniques are applicable to a broad range of dynamic systems, especially those containing multiple technologies that must work together to accomplish the overall design objectives. The method supports the concept of interdisciplinary design teams, by providing enhanced communication among engineering specialists.