| 摘要 |
The present invention relates to a method comprises the following steps: • measuring the pressure in each cylinder during a compression stage, • determining the mass of gas present in each cylinder considered, on the basis of the quotient obtained when the product of the pressure multiplied by the variation in volume and by a corrective term is divided by the product of the variation in temperature multiplied by the heat capacity at constant volume of the gas mixture, according to formula (I), where: MAF_CYL is the mass of gas in the cylinder considered, Pcyl is the pressure measured in said cylinder, dV/d(crk) is the variation in volume in the cylinder, for an angular variation of the crankshaft equal to d(crk), dTcyl/d(crk) is the variation in temperature in the cylinder for an angular variation of the crankshaft equal to d(crk), CV is the heat capacity at constant volume of the mass of gas, α - 1 is said corrective term, representing the heat losses taken into consideration, • determining the mass of gas present in all the engine cylinders over a full combustion cycle, • determining the mass of gas corresponding to the recycled exhaust gas, on the basis of the difference between the mass of gas present in the cylinders and determined in the preceding step, and the mass of fresh air measured, corresponding the same full combustion cycle. |
