METHOD AND MEASURING ARRANGEMENT FOR DETERMINING SPECIFIC AND/OR ABSOLUTE EMISSIONS VALUES FOR NOX AND/OR CO2 IN AN INTERNAL COMBUSTION ENGINE

摘要

In a measurement arrangement for determining specific and/or absolute emissions values for NOx and/or CO2 (19) in an internal combustion engine (3), it is proposed that the profile with respect to time (5) of the cylinder pressure (1) at at least one cylinder (2) be measured and, from this, without direct measurement of a rotational angle of a crankshaft (7), a cylinder pressure curve (10) be derived which represents the relationship between the cylinder pressure (1) and a rotational angle of a crankshaft (7) of the internal combustion engine (3). It is furthermore proposed that, from said cylinder pressure curve (10) in combination with a CO2 - and/or O2 - concentration measurement, an output power (11) and an exhaust-gas mass flow rate (12) be determined, which are combined with a measured NOx concentration (17) in the exhaust gas (15) of the internal combustion engine (3) to give the specific and/or absolute emissions values for NOx and/or CO2 of the internal combustion engine (3).