ABSTRACT
The NE1 engine family entered production in March 2019 and marked a significant step forward in efficiency and refinement for Changan customers. As that engine exceeds one million units produced, focus has moved to a new engine family specifically designed for hybrid applications.
In preparation for the new engine family development, Changan UK R&D centre has designed and built a multi-cylinder turbocharged engine which can achieve greater than 45 % brake thermal efficiency, termed FE15. The operating regime of a dedicated hybrid engine has allowed advanced development opportunities on the FE15 engine in the area of the combustion system and friction reduction which will feed into the design of the new production engine.
This paper focuses on combustion system development of the FE15 and the following technologies are presented in detail:
A study on the impacts of the engine's geometry and increased cylinder capacity as an enabler of high compression ratios, elevated air motion and engine operating conditions to achieve high efficiency
An overview of a combustion system layout to enable multiple ignition sources without compromising gas exchange
A comparison of ignition source performance including conventional single spark plug, triple spark plugs and passive pre-chambers is presented
Continued evaluation of both LIVC and EIVC as a means of improving combustion knock at high compressions ratios (14~17)
High dilution ratios with air (lean) and EGR
The testing of various conventional turbochargers and a 48 V E-booster
