48-V Mild Hybrid System for Medium- and Heavy-duty Trucks
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DE VELO PMENT Hybrid Drives
48-V Mild Hybrid System for Medium- and Heavy-duty Trucks
Mild hybrid drive systems on a 48-V basis offer cost and packaging advantages in comparison to high-voltage applications. Their lower voltage, however, means that the expected currents are very high. Mahle explains how the resulting increased requirements on the components battery and motor can be met. COMPACT AND LIGHT SYSTEMS ARE EXPECTED
A drive system as a 48-V mild hybrid can make a considerable contribution to fuel savings if energy can be stored in and retrieved from the battery in a very short time. This is particularly necessary for vehicles used for freight, commercial, and specialized applications, but also
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to some extent for passenger transport. For these applications, Mahle is developing a powerful mild hybrid system on a 48-V voltage basis that can significantly contribute to sustainable mobility due to its energy efficiency. Hybridization makes it possible to recover energy that can support the vehicle electrical system or can be fed back to the powertrain under high loads. In
AUTHORS
Dr. Peter Geskes is Director Product Development at Mahle in Stuttgart (Germany).
Michael Moser is Lead Engineer Battery Systems at Mahle in Stuttgart (Germany).
Matthias Rinderle is Head of Product Segment Automotive Drive Systems at Mahle in Stuttgart (Germany).
doing so, fuel can be saved. For example, braking energy can be stored temporarily in the battery so that it is available for the next acceleration. Very high rates of charging and discharging cycles are expected during driving operation, and the mild hybrid system must be designed to guarantee this application case. The requirements for the battery are significantly higher in terms of service life, power output, range of applications and availability as well as cycle dura bility in comparison to current 48-V batteries of Mild Hybrid Electric Vehicles (MHEVs) for the passenger car segment. In addition, very compact and weightoptimized systems are expected. MODULAR SYSTEM AND AREA OF APPLICATION
The 48-V MHEV battery developed by Mahle meets the requirements described before. Along with a compact, universally deployable modular system, the high charging and discharging capability over a broad range of State of Charge (SoC) maximizes battery performance – and at reduced installation space and weight in comparison to the conventional batteries. Other increases in efficiency regarding the powertrain are achieved by significantly improving cold-cranking capability and low-temperature availability. The 48-V MHEV battery supports the combustion engine even at low ambient temperatures, helping to reduce the vehicle’s fuel consumption and exhaust gas emissions, including under extreme weather conditions. Due to its high durability and the associated extended service life and higher cycle life, the battery has substantial potential for economic and environmental benefits. The scope of application of this battery is tailor-made for use in the mediumand heavy-duty
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