The development service supplier FEV and automotive supplier SEG Automotive have launched new concept vehicle A48V. Through 48V mild hybridization powered by the Boost Recuperation Machine (BRM) from SEG Automotive, driving not only becomes more enjoyable and fun, but also more efficient.
“48V mild hybridization offers great potential to increase the efficiency of conventional powertrains. For this purpose, a powerful 48V belt starter generator, in this case- the BRM from SEG Automotive, replaces the conventional 12V generator. This requires only minor modifications of the powertrain and therefore entails comparatively low costs. The 48V BRM enables hybrid functions such as brake energy recovery (recuperation), electrical torque support, load point optimisation and particularly smooth start/stop engine starts. In addition, the increased electrical power enables the use of power-hungry consumers or safety features. All the while the BRM from SEG Automotive significantly reduces CO2 emissions, helping the OEMs to reach the targets of CAFE norms mandated by the Indian government,” said Anil Kumar M R, Managing Director, SEG Automotive India Private Limited.
The concept vehicle, which FEV developed in cooperation with SEG Automotive and the Chair of Internal Combustion Engines at RWTH Aachen University, uses a 48V BRM in combination with an electric compressor to significantly improve responsiveness, efficiency and comfort.
With the aid of the electric compressor, the maximum torque of the combustion engine is reached at just 1600 rpm – 650 rpm earlier than in a standard AMG A45 vehicle. In addition, the boost function of the BRM provides additional torque to the combustion engine. At the same time, the BRM enables extremely comfortable start/stop functionality. The high torque capacity of the BRM ensures an almost immediate engine start, which effectively avoids comfort-impairing resonances, which can occur with conventional 12V start/stop systems.
The BRM also makes a significant contribution to increasing efficiency. Upon braking, part of the kinetic energy is recovered and stored in the 48V battery. During coasting phases, the combustion engine is decoupled from the transmission and switched off. As a result, the vehicle can maintain kinetic energy and coast for longer by avoiding the friction losses of the combustion engine. When the driver wants to accelerate, the combustion engine is smoothly and immediately restarted and re-engaged into the powertrain. In real operation, the BRM saves up to 15 percent fuel and to the same degree CO2.
A camera-based sensor system detects the vehicles travelling ahead of the car. As the driver takes his foot off the accelerator, a prediction algorithm calculates whether it makes sense to switch into coasting mode or whether deceleration is necessary in order to avoid tailgating. The BRM automatically regulates the degree of deceleration so that the mechanical brake system is not required.