In these times of stringent emissions regulations, more electrical power is needed to support added vehicle features and it is observed that even a 48-volt architecture has limited electrical energy storage. BorgWarner presented a smart combination of the company’s 'eBooster' electrically driven compressor and its belted motor generator unit (MGU) on a demonstrator vehicle. Easily integrated into existing propulsion systems, the cost-effective combination is said to provide an ideal solution for 48-volt electrification. Benefits such as improved low-speed engine torque in combination with engine downsizing, downspeeding and brake energy recuperation allow for significant fuel efficiency enhancements.
According to Borgwarner, the synergy between the components in the demonstration vehicle, a heavy pickup truck, enables energy efficient means to collect regenerated energy and provide added torque, faster engine response, and extended engine off operation among a list of added features.
The compact eBooster, which is an electrically driven compressor is independent of the exhaust gas flow, as it uses an electric motor to drive the compressor wheel. This is claimed to provide an outstanding low-end torque and can be installed in different locations of the air path with an actively controlled bypass valve next to it. High system efficiency as well as extraordinary power density and improved acceleration time virtually eliminates turbo lag. It further claims that the technology reduces pumping losses, and – due to higher low end torque – allows for the possibility of further downsizing and downspeeding.
BorgWarner’s advanced MGU is usually located within the powertrain architecture to facilitate hybrid functions but the new MGU is connected to the engine via a front-end accessory drive. Its position can be varied, depending on the architecture and integration needs. Different available configurations also allow for varying performance characteristics. Capable of adding as well as subtracting torque, the technology captures sufficient regenerative electrical energy to supply the vehicle’s electrical loads with additional electrical energy to save fuel. The 48-volt MGU, which has a capability of 25 kW input and output, claims to provide quick and smooth engine starts. In addition, BorgWarner provides a motor generator with integrated electronics (MGI) which offers multiple electromagnetic variants to meet varying performance requirements.
Robin Kendrick, president and general manager, BorgWarner Turbo Systems, said, “At BorgWarner, we are constantly working on improving our system technology solutions. The combination of our eBooster technology with the MGU presents an ideal 48-volt capable solution for our customers and strengthens our position as a supplier of choice.”
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