Abstract
Thermo-mixed-hydrodynamics of compression rings and big-end bearings are presented. Frictional losses under normal engine operating conditions for a gasoline engine and those with cylinder deactivation (CDA) are predicted. With CDA, the combustion chamber pressure increases in the active cylinders, whilst some residual pressure remains in the deactivated ones. For the former, the increased in-cylinder temperatures reduce viscous friction, whilst reducing the load carrying capacity, promoting increased boundary interactions. In deactivated cylinders, lower contact temperatures yield increased viscous friction. Overall, a 5% improvement in expended fuel is expected with the application of CDA. However, 10% of these gains are expended due to increased friction. The study demonstrates the need to consider total system effects when introducing new technologies such as CDA.
Highlights
Recent years have witnessed the emergence of new technologies for improved fuel efficiency of internal combustion engines
A comprehensive multi-phase solution for journal bearings was provided by Shahmohamadi et al [47], including the combined solution of Navier-Stokes, energy and vapour transport equations with modified Raleigh-Plesset equation for finite thin film flow conjunctions. Their numerical analysis was validated by experimental results and extended to the case of big-end bearings subjected to cylinder deactivation (CDA) for a 4-cylinder engine
Step 2: The procedure is initialised with a guess for the minimum lubricant film thickness with ambient values used for lubricant viscosity and density, enabling the determination of hydrodynamic pressure distribution using equation (1)
Summary
Recent years have witnessed the emergence of new technologies for improved fuel efficiency of internal combustion engines. A comprehensive multi-phase solution for journal bearings was provided by Shahmohamadi et al [47], including the combined solution of Navier-Stokes, energy and vapour transport equations with modified Raleigh-Plesset equation for finite thin film flow conjunctions Their numerical analysis was validated by experimental results and extended to the case of big-end bearings subjected to CDA for a 4-cylinder engine. This paper provides solutions for a typical cylinder of a 4-cylinder engine, including both the top compression ring-liner conjunction and the big-end bearing with CDA. This integrated approach has not hitherto been reported in the literature
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
