innovation Operating strategy, driveability, driving range and service life of the battery: when electrified drives are calibrated, all of these features have to be optimized and co-ordinated with one another in the best way possible. A new method developed by AVL now helps to perform calibration tasks much faster and more efficiently – even with all-electric vehicles. Eficient E-Vehicle Ca libration Calibrators carry out electric vehicle driveability calibrations using HyHab, a methodology developed by AVL. With this new method, which is also applied in hybrid vehicles, the automatic execution of tests on the test bed is combined with offline calibration. This can also give the electric vehicle a very specific character: “By means of filtering, we can attenuate the moment of the electric motor or else achieve a clearly noticeable acceleration. This can give electric vehicles very individual characteristics, spanning from an exceptionally comfortable to a very sporty driving behavior. This aspect is becoming more and more important, as manufacturers want to be able to give future electric vehicles a brand-specific character,” Kokalj concluded. < 2 7 F o c u s AVL performs calibrations for conventional powertrains and hybrid drives – but also for all-electric drive solutions, which, in future, will increasingly be put to use in urban transport. As electric vehicles (unlike hybrids) only have one drive motor, Focus asked Gerhard Kokalj, Head of Transmission and Hybrid Calibration, whether he thought that calibrating electric vehicles (EV) was less trouble than calibrating hybrids. “Basically, it is,” said Kokalj. “But in this case, we face many new challenges, the biggest of which is probably the battery range and service life. By taking a new approach, we are trying to make better use of the battery’s energy. The fundamental idea is to temporarily leave the ideal charge range behind in order to temporarily increase its range without damaging the battery in the process. An intelligent operating strategy, which would also process, say, geographical data about the conditions ahead supplied by a satnav has a key role. What is special about our approach is that we at AVL develop the entire strategy within a testing environment – from the simulation on a battery test bed to the vehicle test on a dynamometer in a virtual vehicle environment”. Another important field is diagnostics calibration which is done to ensure the electric vehicle’s safety and reliability. “Where this is concerned, the entire vehicle is automatically tested in its different driving modes on the dynamometer (specifically AVL is improving battery range and service life. the parameters SOC, SOH, > electric moment, battery temperature, etc.). The data are then fed into AVL fOX, a special tool for this purpose. Based on these data, the calibrator can then ensure offline that e.g. the bounds of the plausibility corridor for electric moment are not exceeded. Unlike conventional calibration in the vehicle, this can be accomplished much more efficiently and faster than before.“ Photos: Helmut Lunghammer, AVL > Gerhard Kokalj, Head of Transmission and Hybrid Calibration
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