Objective Vehicle Dynamics Investigations on Cars with Battery Electric Drives
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Objective Vehicle Dynamics Investigations on Cars with Battery Electric Drives
Using vehicle dynamics measurements and targeted interventions in the chassis technology, the desired driving experience can be generated according to the DNA of an OEM. This is especially true for battery electric vehicles. Mercedes-Benz and measX present a mobile measurement data acquisition with offline software system, which allows a maneuver evaluation after the execution of the experiment and is extended with methods of artificial intelligence and machine learning.
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© Mercedes-Benz
INTERACTION WITH THE CHASSIS
Mercedes-Benz vehicles have been forerunners in passive safety for many decades. There were thus many world premieres during the postwar period in the realm of crash safety and, in the 1980s, a production vehicle was introduced with an airbag for the first time. Active safety also continued to evolve in parallel with this. Mentioned here, for example, are the introduction of ABS and ESP systems and also assistance systems introduced in recent years (lane-change assistants, steering assis-
AUTHORS
Dipl.-Ing. Andreas Pfister is Measurement Engineer in the Development Vehicle Dynamics Department of Mercedes-Benz AG in Sindelfingen (Germany).
Dipl.-Ing. Andreas Geng is Testing Engineer in the Development Vehicle Dynamics Department of Mercedes-Benz AG in Sindelfingen (Germany).
tants, etc.). All of these systems help avoid accidents or at least reduce the consequences of accidents. In order for this to function as well as possible, the control system must always be eval uated and optimized in interaction with the respective chassis. Great advances have also been made in the area of chassis development, for example through more elaborate axle design, optimized suspension systems and/or adaptive shock absorption technology. Advances in tire development are also important, which eventually lead to the desired driving behavior on the road and make it possible for today’s drivers to clearly discover more performance and reserves in their driving experience. If driving comfort can be kept simultaneously at a high level, then the conflict in goals between ride and handling can be solved.
UNEQUIVOCAL ASSESSMENT WITH OBJECTIVE PARAMETERS
A driving test with an analysis of driving behavior has a key function. Here, vehicle dynamics and driving comfort are tested and evaluated, in this case through metrological means. Objective parameters allow for an unequivocal assessment through comparisons and, while maintaining limit values, provide certainty that driving safety is always guaranteed. A great deal of importance for the entire product development process is also derived from this. Vehicle dynamics parameters can be calculated via appropriate simulation models even before the first prototypes are available for real-life driving tests. Maintaining the limit values can thus be taken into consideration as
FIGURE 1 Lower center of gravity – position of the two drive modules and the battery for a Mercedes-Benz EQ electric car (©
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