Audi has introduced its latest combustion engines for the A5 and Q5 series, featuring the new MHEV plus technology built on the Premium Platform Combustion (PPC). This mild hybrid system integrates a powertrain generator (PTG), a belt alternator starter (BAS), and a lithium iron phosphate battery. The technology is designed to support the combustion engine, reduce emissions, and enhance performance. The PTG enables partially electric driving by combining integrated power electronics and an electric motor, contributing to improved fuel efficiency and a smoother driving experience.
The MHEV plus system is composed of three key components: a compact powertrain generator with integrated power electronics, a 48-volt battery, and a belt alternator starter. The system is liquid-cooled to maintain optimal operating conditions and is adaptable to various models with front and all-wheel drive configurations. It supports purely electric operation in certain conditions and can assist the combustion engine to improve performance and reduce fuel consumption.
For example, the A5 2.0 TDI can achieve fuel savings of up to 0.38 liters per 100 km, while the 3.0 TFSI with a V6 engine can save up to 0.74 liters per 100 km, according to WLTP standards. These improvements are enabled by the PTG, which can provide up to 18 kW of additional power and 230 Nm of torque. At speeds up to 140 km/h, the PTG can engage to enhance efficiency or disengage to reduce energy losses.
The system also includes advanced energy recovery capabilities through the integrated brake control system (iBRS), which maximizes regenerative braking while minimizing the use of mechanical brakes. The BAS aids in engine start-up and energy recovery, while the lithium-ion battery ensures consistent performance with its optimized cooling system.
MHEV plus technology allows for emission-free coasting, energy recovery, and partially electric operation for activities like parking and maneuvering. It also enhances driving dynamics by providing immediate torque during acceleration. The system adjusts based on driving modes, ensuring optimal performance and efficiency across various conditions. However, this technology will not be available in the U.S. market due to differing customer preferences.
