Audi Introduces MHEV Plus Technology in A5 and Q5

At the core of the MHEV plus system is the powertrain generator (PTG), which integrates power electronics and an electric motor. This setup enables partial electric driving, reducing fuel consumption and introducing trademark EV smoothness. Alongside a belt alternator starter (BAS) and a lithium iron phosphate battery, these components work together to provide electric boosting, improve start-stop functionality, and optimize energy recovery.

"With the new MHEV plus technology, we are driving forward electrification in our new combustion-engine vehicles," said Geoffrey Bouquot, Audi’s head of technical development. "This strengthens our lineup of all-electric, plug-in hybrid, and efficient combustion models."

In layman terms, the MHEV plus system enhances both performance and fuel efficiency. In the A5 2.0 TDI, it reduces fuel consumption by up to 0.38l/100km and cuts CO2 emissions y up to 10 g/km. The 3.0 TFSI V6 variant benefits from even greater savings, with up to 0.74l/100km in fuel savings and a 17 g/km reduction in emissions.

A key upgrade from Audi’s previous mild hybrid system, the PTG can provide up to 18 kW of electric power and 230 Nm of torque at startup. It operates up to speeds of 140 km/h before decoupling to prevent energy losses.

Audi has also incorporated a smart operating strategy that adjusts energy use based on driving conditions. The system supports emission-free coasting, electric parking, and regenerative braking. It also improves responsiveness, particularly at low speeds.

The MHEV plus system offers a step forward in efficiency without requiring a shift to fully electric powertrains.