How it works audi plug-in hybrid technology, Audi A3 Sportback TFSI e - systemlayout and driving modes explained & animated
Efficiency – charging comfort – everyday usability:
the plug-in hybrids from Audi
Audi is rapidly expanding its range of plug-in hybrid models. The latest models of the A3 Sportback, Q3, and Q3 Sportback, as well as the Q8 complement the portfolio in the compact segment and full-size class. Their common strengths are a confident driving experience, straightforward charging management, and great everyday usability. These three strengths make up the fundamental target triangle in the development work for the plug-in hybrid models at Audi.


In “Auto Hybrid” mode, which is the main operating mode, the TFSI and the electric motor divide up the work intelligently and with maximum efficiency, using fully electric power at low speeds, predominantly the TFSI engine at higher speeds, and often a combination of the two. The electric motor provides support when accelerating or wherever there is a high load requirement. When the driver depresses the accelerator firmly, the interplay between the electric motor and the gasoline engine creates a powerful boost. When accelerating from low rotational speeds, for example, the electric motor bridges the tenths of a second that the turbocharger needs to build up pressure. When driving at consistent rotational speeds, it sometimes functions as an alternator, thereby shifting the load point of the TFSI to operating ranges with higher efficiency.

The predictive operating strategy helps with consumption reduction and recuperation in driving operation. In hybrid mode and when route guidance is activated, it controls the powertrain in such a way that the battery charge is distributed intelligently across the entire driving route. It evaluates data from the navigation system, sensors, and assist systems continuously. The predictive operating strategy takes real-time events such as traffic jams or dense city traffic into account and adapts its calculations to the driver’s style. Based on this information, it calculates a rough plan for the journey.

At the same time, it prepares a fine plan for short distances, working together closely with the predictive efficiency assist (PEA). The PEA uses the data of the on-board sensors to identify upcoming town signs, intersections, speed limits, and vehicles driving in front.

Hybrid mode integrates two further modes that the driver can activate in the MMI operating system. If the driver selects “Battery hold,” the current state of charge of the battery is maintained in order to save energy for driving with purely electric power in an urban environment later on, for example. In “Battery charge” mode, the battery is charged while driving so that more energy is ultimately available for driving with purely electric power later on, for example in urban areas. Drivers can use the EV button to prioritize driving with fully electric power.

As soon as the driver takes their foot off the accelerator pedal, the hybrid management system and the predictive efficiency assist jointly decide between the two possibilities of letting the models coast with deactivated drive or decelerating them – like in the case of the A3 and Q8 – via the electric motor and recuperating. When the automatic transmission is in S gear, all models go into distinctive coasting recuperation.

The electric motor performs brake operations up to around 0.3 g alone – i.e. the vast majority of decelerations in everyday driving – and recovers energy. Only when the driver depresses the brake pedal more heavily do the hydraulic wheel brakes come into play as well, activated by an electric brake booster. The transition is almost unnoticeable and is referred to as brake blending. The brake pedal always provides excellent feedback and can be modulated precisely. Recuperation remains active. While braking, the A3 TFSI e and the Q3 TFSI e recover up to 40 kW of energy; the Q8 TFSI e quattro recovers up to 80 kW.


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