A compression-ignition "split-cycle" engine comprises: a cylinder block with an expansion cylinder having an expansion piston that is adapted to move alternatively between a top dead center (ETDC) and a bottom dead center (EBDC) by a crankshaft mechanism that causes a predetermined position of the expansion piston to correspond to a predetermined crankshaft angle; a compression cylinder having a compression piston that is adapted to move alternatively between a top dead center (CTDC) and a bottom dead center (CBDC) according to a predetermined angular phase shift in delay to the expansion piston; a cylinder head that closes the cylinders and comprises a crossover passageway with an opening in constant communication towards compression cylinder and an opening having a transfer valve towards expansion cylinder, an intake valve and a exhaust valve; a means for opening/closing the transfer valve; a means for opening/closing exhaust valve at predetermined moments of the alternative cycle of the pistons, and a fuel injector in the crossover passageway. The opening movement of the transfer valve is carried out in advance 20° or more of crankshaft angle with respect to the crankshaft angle of the ETDC, such that from the opening instant up to reaching the ETDC there is a substantial equalization of pressure between the cylinders, such that between the ETDC and the CTDC a transfer occurs of the comburent fluid between the two cylinders, and such that injector injects the fuel starting from the achievement of the ETDC.

Split-Cycle Engine

GENTILI, ROBERTO;MUSU, ETTORE;ROSSI, RICCARDO
2010-01-01

Abstract

A compression-ignition "split-cycle" engine comprises: a cylinder block with an expansion cylinder having an expansion piston that is adapted to move alternatively between a top dead center (ETDC) and a bottom dead center (EBDC) by a crankshaft mechanism that causes a predetermined position of the expansion piston to correspond to a predetermined crankshaft angle; a compression cylinder having a compression piston that is adapted to move alternatively between a top dead center (CTDC) and a bottom dead center (CBDC) according to a predetermined angular phase shift in delay to the expansion piston; a cylinder head that closes the cylinders and comprises a crossover passageway with an opening in constant communication towards compression cylinder and an opening having a transfer valve towards expansion cylinder, an intake valve and a exhaust valve; a means for opening/closing the transfer valve; a means for opening/closing exhaust valve at predetermined moments of the alternative cycle of the pistons, and a fuel injector in the crossover passageway. The opening movement of the transfer valve is carried out in advance 20° or more of crankshaft angle with respect to the crankshaft angle of the ETDC, such that from the opening instant up to reaching the ETDC there is a substantial equalization of pressure between the cylinders, such that between the ETDC and the CTDC a transfer occurs of the comburent fluid between the two cylinders, and such that injector injects the fuel starting from the achievement of the ETDC.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/139127
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