Control method

• Main Authors: JOEL DUHR, HERMANN J. BREITBACH, STEFAN G. BILLIG
• Format: Patent
• Language: English; French; German
• Published: 17.03.2004
• Edition: 7
• Subjects: MEASURING; PHYSICS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR

The reference and measurement intensities of infrared radiation transmitted through the measurement cell into which sample of exhaust gas flows, are measured and compared to deduce concentration value of one or more constituents of the exhaust flow. The control parameters of the combustor (10) such as IC engine is varied in response to each concentration value to optimize the concentration of each constituent. A method for controlling the concentration of one or more constituents of an exhaust flow from a combustion device (10), the method comprising providing a measuring cell (13) and passing at least a sample of the exhaust flow through the cell (13); transmitting infra red radiation at a reference wavelength through the measuring cell and measuring a reference intensity which is representative of the intensity of radiation transmitted through the cell (13) at the reference wavelength. Infra red radiation, at one or more measurement wavelength, is transmitted through the measuring cell (13) and a measurement intensity is measured which is representative of the intensity of radiation transmitted through the cell at the or each measurement wavelength. The reference intensity is compared with the or each measurement intensity to deduce a concentration value for one or more constituents of the exhaust and one or more control parameters of the combustion device (10) is varied in response to the or each concentration value, thereby to optimise the concentration of the or each constituent of the exhaust flow.