METHOD FOR DETERMINING ATMOSPHERIC PRESSURE DURING THE OPERATION, IN A PARTIAL LOAD STATE, OF A TURBOCHARGED ENGINE

摘要

The present invention concerns a method for determining atmospheric pressure AMP during the operation, in a partial load state, of a turbocharged engine (1) comprising an air inlet line (2) incorporating a butterfly valve (16), and an exhaust line (3) comprising a bypass duct (20) incorporating an exhaust gas discharge valve (21). According to the invention, the method consists of measuring the air pressure PUT upstream from the butterfly valve (16), and, at a given engine (1) speed N rpm, when the boost pressure PUT corresponds substantially to the natural boost pressure, of determining the atmospheric pressure AMP = AMP(0) + PUT - PUT(0), in which AMP(0) is the previously measured atmospheric pressure, and PUT(0) is the natural boost pressure obtained, at engine (1) speed N rpm, for atmospheric pressure AMP(0).