Five-stroke engine

Abstract

The invention discloses a five-stroke engine. The five-stroke engine comprises a first cylinder, a second cylinder, an auxiliary cylinder and a boost mechanism, wherein an intake port and an exhaust port of the first cylinder are both connected with the boost mechanism; the exhaust port of the first cylinder is connected with an intake port of the auxiliary cylinder; an intake port and an exhaust port of the second cylinder are both connected with the boost mechanism; the exhaust port of the second cylinder is connected with the intake port of the auxiliary cylinder; and an exhaust port of the auxiliary cylinder is connected with the boost mechanism. The five-stroke engine realizes out-cylinder low-temperature pressurization, increases the intake density, relieves in-cylinder knocking phenomenon while satisfying the power requirement, improves the engine isometry degree, optimizes the combustion phase, improves the heat efficiency, and on the other hand, reduces the exhaust temperature, and protects turbine blades.

Description

technical field [0001] The invention relates to a technology in the field of internal combustion engines, in particular to a five-stroke engine. Background technique [0002] In order to reduce the fuel consumption and exhaust emissions of the engine, the main measures are: miniaturization of high-pressure engine, direct injection in cylinder, intelligent thermal management and cooling EGR (ExhaustGasRecirculation, exhaust gas recirculation), etc. However, these measures have limited improvement. [0003] Since the energy waste caused by engine exhaust is as high as more than 30%, the use of exhaust energy can reduce energy consumption. By adopting turbocharging technology and Atkinson cycle, the exhaust energy can be better utilized. In a five-stroke engine, the utilization of exhaust energy is achieved by adding auxiliary cylinders for mass re-expansion. The five-stroke engine, originally proposed by Schmitz, uses dual expansion cycles to increase the expansion ratio. ...

AI Technical Summary

Problems solved by technology

However, the system does not include the expansion cylinder. During the turbo matching process, some load conditions exist that the exhaust gas discharged from the cylinder is directly discharged through the wastegate valve, and the exhaust gas cannot be fully utilized.

Images