TESTING
stops, the development of new drive systems such as electrified powertrains has continued. Not only is there an ongoing global transition in the way we propel the vehicles but also how our vehicles are controlled with more Advanced Driver Assistance Systems (ADAS) functionality being implemented. With the rapid introduction of new powertrain configurations in combination with a growing number of derivatives to meet wider customer segments, the number of vehicle variants to be calibrated, tested, and validated continues to increase. However, as consumers are not expected to accept a higher price tag on their next car, the increased volume of development must become more efficient to reduce costs. One of the megatrends in the
global automotive industry is development towards autonomous driving, although it may now take some additional time until we see many vehicles being fully self-driving.
This is a Tesla on test
Meanwhile, ADAS plays a crucial role for the medium-term reality of cars taking over more control from drivers. Calibration and validation in this area is growing rapidly and Rototest is involved in multiple innovative projects globally. Customers report that time savings
of up to 80% are achievable by moving calibration manoeuvres from road testing into the lab environment. The powertrain dynamometer systems from Rototest provide an efficient testing environment for ADAS functionality calibration and validation thanks to its modular use structure. Apart from ADAS, Rototest’s
dynamometers are additionally applicable on demanding high dynamic manoeuvres. A typical such manoeuvre is a WOT (Wide- Open-Throttle) standing start with maximum acceleration from standstill through the gears. Even with a medium powered vehicle, trying to conduct such a manoeuvre on a traditional roller type dynamometer
commonly results in unrealistic and excessive tyre slippage. As Rototest’s dynamometers connect directly to the vehicle’s wheel hubs the relationship between tyre and surface can, for each wheel independently, be defined such that it can realistically represent dry, wet, snow or icy road conditions. Rototest’s high dynamic control
technology, the HDC, is included as a standard feature on many of the models in the powertrain dynamometer series. The HDC furthermore includes an integrated 14 DOF (Degrees-Of-Freedom) vehicle model. The integrated model is easily parameterised by only a few physical properties of the vehicle. Reducing the number of parameters required and keeping them to commonly published physical properties makes the process of setting up a new vehicle in the dynamometer system not only quick and effortless but also enables swift setup of vehicles of unknown detailed specification, such as competitor vehicles.
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