Audi SQ8 – Mild hybrid system with electric powered compressor (EPC)

Innovation Discoveries
An electric powered compressor (EPC) in Audi SQ8 TDI supplements the work of the two turbochargers when starting off and when accelerating at a low engine speed, allowing the V8 TDI to always build up its power spontaneously.

The EPC operates with a constant voltage of 48 volts.

It is situated in the intake air path behind the intercooler and is active in the following two operating statuses: During start-up, the bypass closes and the EPC precompresses the airflow.

This increases the filling of the combustion chamber.

When driving, if the load requirement from the accelerator is high while the amount of energy available in the exhaust gas is low, the bypass flap closes and the intake air flows into the EPC, where it is compressed for the second time.

A compact electric motor with an output of up to 7 kW accelerates the compressor wheel of the EPC to up to 70,000 rpm in approximately 250 milliseconds.

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