High-Dynamic Powertrain Test Bed - The Extension to a Chassis Roller and Roadway Tests

摘要

The major challenge in powertrain development today is focused around rapidly shortening vehicle development cycles. To meet this challenge there is a significant need for parallel development of key powertrain components as well as a holistic approach of testing the powertrain. The position of powertrain testing during the vehicle development has changed dramatically. In the past, emission and fuel consumption optimization was clearly dedicated to engine development. Significant improvements are achievable today by a holistic approach of optimizing the complete powertrain.Therefore a high-dynamic powertrain test bed n which the wheels will be replaced by wheel-dynamometers having the same inertia will be used. This test bed type ensures the same natural frequencies as in the vehicle. This is important for misuse tests as well as for optimization tests and vibration analysis. A high-dynamic simulation model simulates the transferable forces of each tire. The tires are "synchronized" by a vehicle model which simulates the longitudinal, transverse and yawing motion. Thus driving manoeuvres can be carried out on the test bed which has been reserved for road tests.This paper describes the advantages of a high-dynamic powertrain test bed (e.g. for shift quality optimization). Furthermore a comparison to chassis rollers and roadway tests will be made.