Both IAV Engine and IAV Engine Toolbox are integrated tools for developing and optimizing mechanical engine systems. With IAV Engine being so fast, numerous options can be simultanously examined and interactively compared. Particularly at the early stages of the development process, the tool’s easy-to-parameterize models provide important information – such as estimating potentials. IAV Engine Toolbox is used as a portal to IAV concept and analysis tools as well as to other design and simulation tools.
Over 20 years of experience in designing mechanical systems have gone into IAV Engine. IAV has brought together its expertise in developing mechanical drive systems for engines and powertrains. The suite provides all of the tools needed for this, e.g. for designing and adapting valvetrains, cranktrains, timing gears, engine mount systems and complete powertrains – right through to evaluating the potential of a new development for reducing CO2.
IAV Engine supports the user with an intuitive user interface, wizards, interactive designers, variant management as well as perfected post-process and animation technologies. “In most cases the integrated models can be computed very quickly, making it possible to examine many options without a problem and also work interactively”, says Steffen Kux, software manager for IAV Engine. “Being able to work intuitively allows the user to quickly get an understanding of the system, particularly as the tool can be used at a very early stage in the development process – even if there are not yet any CAD models available.”
Modules for valvetrain and cranktrain as well as crankshaft geometry
To configure and compute conventional and variable valvetrains, IAV Engine comes with a comprehensive package of functions which, in particular, is distinguished by the integration of the sub-components for cam layout, spring layout, kinetostatic and dynamic analyses. The tool provides several modules for the designing and analyzing of the cranktrain as well as for modeling and optimizing crankshaft geometry. These include modules for designing friction bearings, evaluating friction and simulating torsional vibrations.
Timing gear and auxiliary drives can also be modeled and rated with IAV Engine. The relevant module provides the capability of interactively modeling chain drives (and in future also belt and gear drives). Besides interactive designers for producing the layout, it also offers tools for calibrating the tensioning systems, for evaluating geometry and kinetostatics as well as for estimating elongation and friction.
Design and analysis of engine mount systems
IAV Engine contains numerous benefits for designing the engine mount system. The forces and moments from other modules, such as cranktrain or valvetrain, can be applied to the engine block as excitation. After defining the engine block, this information is used for determining and visualizing engine block movement, bearing responses as well as the natural frequencies and natural modes of the mount system.
The module for powertrain longitudinal dynamics and cycle simulation is capable of analyzing conventional, all-electric and hybrid powertrains. In addition to computing assessment variables, such as sprinting, hillclimbing and accelerating ability, it can also determine consumption in a cycle simulation. Visualizations and evaluation functions are an integrated aspect of the tool as well as macro and script capabilities. By linking IAV Engine’s parametric engine model with the powertrain model, it is possible to evaluate the influence of a development on CO2 emission in a very early phase.
Mathematical optimization with IAV Engine Toolbox
IAV Engine Toolbox is a portal that gives developers access to integrated function and layout tools from IAV. It permits a standardized workflow and provides assistance with multicriteria optimization, variant and tolerance analysis. Plug-ins make it possible to integrate any tools, e.g. for optimization. Interconnecting several computers ensures short computing time. This noticeably reduces the total computing time, in particular for lengthy algorithm evaluations.
The module for multi-criteria optimization and variant analysis (UNO) can be used for performing optimization tasks with IAV Engine or external tools. Various methods are available for this, including gradient methods, genetic algorithms, particle swarm methods, adaptive substitute model methods and hybrid methods.
Mathematical decision aid (MCA)
Computations, measurements or multi-criteria optimization runs often produce solutions with a high number of variants. The mathematical decision aid module (MCA) provides effective methods for evaluating this diversity of variants with the aim of selecting those that represent the best compromise. Various mathematical methods are made available for processing and evaluating data.
The TSR module is used for examining the influence tolerances have on component function. Besides analyzing sensitivity, methods are available for statistical and worst-case tolerance analysis.
The general post process (JPPX) has the purpose of visualizing test and computation data. This is supported by a wide range of chart types and display options. The digitizing module (IDEx) is a tool that makes easy work of digitizing diagrams and maps, providing them as data for further processing.
IAV Engine and IAV Engine Toolbox have been used with great success for many years at IAV and its customers. “We are constantly improving the suite, either by adding new modules or by giving existing ones a higher level of detailing”, Kux says. “In the future, this will let users understand the system even better and develop new vehicles even more effectively.”