What does FSI Audi mean?

[LeDakota]

Audi FSI is the abbreviation for Fuel-Stratified-Injection, which means fuel stratified injection, an innovative and revolutionary technology in the field of direct-injection gasoline engines. Below is the relevant introduction: 1. Technical principle: The FSI engine uses a high-pressure pump to allow gasoline to reach an electromagnetically controlled high-pressure fuel injector through a split rail, forming the optimal vortex shape of the intake airflow into the combustion chamber, pushing in a stratified filling manner to concentrate the mixed gas around the spark plug located in the center of the combustion chamber. 2. Characteristics of the FSI engine: The FSI engine is characterized by its ability to reduce pumping losses, ensuring low fuel consumption under low load, but requiring the addition of a special catalytic converter to effectively purify and treat exhaust emissions. The FSI engine can basically automatically select between two operating modes according to the engine load conditions. Under low load, it operates in stratified lean combustion mode, while under high load, it operates in homogeneous theoretical air-fuel ratio combustion mode.