FIELD: engines and pumps.
SUBSTANCE: proposed internal combustion engine comprises expansion ratio control mechanism A to vary expansion ratio and mechanism C to control gas phase distribution at outlet to vary moment of opening of exhaust valve 9. Expansion ratio and moment of exhaust valve opening are selected subject to engine load so that with engine load increasing, expansion ratio increases while moment of exhaust valve sifts toward delay in intake stroke BDC.
EFFECT: higher thermal efficiency.
6 cl, 23 dwg
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