不等長圧縮膨張機関による熱効率改善の可能性(予混合圧縮着火燃焼と新燃焼(1),予混合圧縮着火燃焼と新燃焼)

Abstract

In reciprocating internal combustion engines, the piston stops in a moment at top dead center, so there exists a necessary time to proceed combustion. However more slowing piston motion around top dead center, does it have a possibility to increase cylinder pressure and may lead to an increase of degree of constant volume? In order to verify this idea, the engine with slower piston motion by active piston control was tested. It was revealed that the increased heat loss cancelled out all other favorable features such as lower pumping loss and increase in degree of constant volume.