SYSTEM AND METHOD FOR DETERMINING THE CONCENTRATION OF EXHAUST GASES EMITTED BY AN AUTOMOTIVE INTERNAL-COMBUSTION ENGINE

摘要

An exhaust-gas analyser system (1) for determining the concentration of one or more exhaust gases emitted by an automotive internal-combustion engine, comprising: an infrared multidetector device (5) provided with: a gas-analysis chamber (6) structured so as to contain the exhaust gases to be analysed; an emitter source (7) configured so as to emit infrared radiation into the analysis chamber (6); infrared multidetectors (8) designed to generate electrical measurement quantities, on the basis of absorption of radiation by one or more exhaust gases; an intake pump (11) connected to the analysis chamber (6) for taking in the gases present therein; and an electronic control unit (15) that determines the concentration of one or more exhaust gases on the basis of a series of electrical measurement quantities (Vmi) supplied by the infrared multidetectors (8) and of an electrical reference quantity (V0); the electronic control unit (15) controls the intake pump (11) in such a way as to take in the residual gases contained in the analysis chamber (6) until a condition of absence of gases is reached and determines the electrical reference quantity (V0) on the basis of the electrical quantity generated by the infrared detectors (8) in the condition of absence of gases.