/ 43 EFFORT REDUCTION IN GEAR SHIFTING PROGRAM DEVELOPMENT To achieve CO2 targets while still providing a competitive balance in terms of vehicle performance and driveability, automated transmission technologies such as AMT, DCT, AT and CVT are appearing more and more frequently on the market. Finding the right gear shifting program for the combination of vehicle type, powertrain technology and component limitations is creating new challenges in the vehicle development process. AVL CRUISE GSP (Gear Shifting Program) represents the most efficient way to optimize the development of gear shifting programs. In early concept phases, AVL CRUISE GSP enables engineers to automatically generate gear shifting maps for different vehicle powertrain variants within seconds, improving the accuracy of simulated fuel consumption and vehicle performance results. Later on, calibration engineers can start with a gear shifting program which is near-optimized for fuel efficiency, performance and drive quality before having put the real vehicle on the road or testbed. This significantly reduces the development time and in-vehicle testing costs. VIBRATION, STRENGTH AND ACOUSTIC OPTIMIZATION With different modeling levels based on a rigid/flexible multi-body dynamics solution, AVL EXCITE supports the transient vibro-acoustic analysis of conventional and hybrid automotive and non-automotive drivelines up to 3 kHz. One simulation target is the investigation of the dynamic behavior and acoustic noise phenomena in drivelines under stationary and non-stationary operating conditions (e.g. tip-in/ back-out, start-stop) such as boom, clonk, rattle, whine, chatter, whoop or shudder. For the analysis of vehicle chassis vibrations, the excitation forces from driveline dynamics are applied to the car body at mounting points such as the power unit mounts. Power unit transmission acoustics – investigation of gear whine and gear rattle Upshifting + Downshifting Acceleration Pedal (%) 110.0 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 Velocity (km/h) AVL CRUISE GSP – Generate & Optimize Gear Shifting Strategy towards given targets
Solutionskatalog2016_EN
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