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The investigations on an indirect injection unsupercharged engine fitted with a two state oxygen sensor have showna particularly high fluctuation of mixture composition in transient states of the engine, represented by the rev up andrev down of the engine without a load and with a steady load. The spread of the maximum and average cycle by cyclemixture compositions in these states determined by a method developed by the authors (this method shall be a subjectof a separate publication) is larger if the engine load is lower. It has been proved that the biggest fluctuation of themixture composition occurs in the first part of the rev down phase i.e. in the phase of stepwise throttle closing when theinjectors are still activated. In steady states represented by typical operating states of the engine the highest fluctuationof the mixture composition occurs at high engine speeds and low engine loads, and the lowest at low engine speeds andhigh engine loads. It has been confirmed that the fluctuation of the cycle by cycle mixture composition in the transientstates is almost one order of magnitude larger than in the steady states. The investigations have been performed on a1.6l Euro 3 engine fitted with a control unit made by a reputable manufacturer.

The evaluation of cycle by cycle mixture composition in an indirect injection engine