METHOD FOR CONTROLLING TWO STAGE SUPERIORING OF FIXED GEOMETRY TURBOCHARGERS WITH DYNAMIC ESTIMATOR AND LIMITING THE PRESSURE BEFORE TURBINE

摘要

The invention relates to a method for monitoring the air supercharging of a motor vehicle internal combustion engine (1) fitted with a supercharging stage twin turbocharger (6, 7) including: two turbines (10, 12) that are rotated by the exhaust gases of the engine (1); two supercharging compressors (11, 13) that are driven by each of the turbines (10, 12); and two high- and low-pressure valve actuators (17, 18). Said method includes controlling the compression rate (PRc) of the compressor to around a compression ratio set value (PRc, cons) and moreover controlling the decompression rate (PR1) of the turbine (12) so as to limit the value of the pressure (Pavt, t) upstream from the turbine (12), said control being implemented when the pressure (Pavt, t) upstream from the high-pressure turbine (12) exceeds a threshold value (CONSpavt).