| Citation: | HU Chunming, ZHANG Bo, LIU Na, et al. Air-fuel ratio control of two-stroke aviation piston engine[J]. Journal of Aerospace Power, 2023, 38（11）：2757-2765 doi: 10.13224/j.cnki.jasp.20220008
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A two-stroke aviation piston engine was taken as the research object. By establishing one-/three-dimensional engine model, injector model and air-fuel ratio control model, the main influencing parameters of intake and injection were discriminated. Based on the recurrent neural network intake prediction and injection model, the air-fuel ratio control of two-stroke engine was studied under variable working conditions. Under the transient condition of throttle opening change, the overshoot of air-fuel ratio control was controlled within 4.6%, which can restore the cylinder mixture to the equivalent ratio within 0.3 s after the variable condition stopped. Under the simulation study of different altitude conditions, it was found that with the increase of altitude, the overshoot and callback time of air-fuel ratio control model appropriately decreased and gradually stabilized.
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