Continual Measurement and Analysis of Exhaust Composition of a Gasoline Engine

The volumetric component of CO₂, CO, HC, NO and O₂ in exhaust of spark ignition engine was continually measured and analyzed under the condition of its starting, acceleration, and some steady modes. The results show that: (l) There is a peak value on the curve of CO emission at the starting of engine. (2) The variation of HC is the largest among the exhaust compositions. (3) The coefficients of CO₂, CO, HC NO and O₂ present a proper order, which are sequently 0.007-0.020, 0.049-0.288, 0.1-0.883 0.03-0.077 and 0.024-0.123, while engine is in steady operating mode macrographically.