Dynamic Cylinder Deactivation of ICE Thermodynamic Simulation Methodology Czech Technical Univ

Format:

Book

Conference/Event

Author/Creator:

Bolehovsky, Ondrej, author.

Contributor:

Vitek, Oldrich

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

Cylinder deactivation is a well-known approach to reduce the displacement of the internal combustion engine during its operation. This helps increase specific load of active cylinders and thus improve ICE efficiency. In serial production, cylinder deactivation is massively utilized in the static form, which keeps a set of cylinders deactivated for the time of the low load mode. An advanced cylinder deactivation can be applied in a dynamic form, in which all or a set of cylinders follow a specific deactivation pattern, which consist of a number of firing and deactivated cycles. Such a deactivation strategy allows to dynamically vary the engine displacement in finer steps even for a small number of cylinders. It enables higher displacement reduction, while keeping better NVH, uniform thermal and mechanical stresses in the engine, compared to the conventional deactivation. There have been a few papers that dealt with such deactivation strategy, but none of them has focused in detail on the thermodynamics, e.g., gas exchange process and inherent cylinder content during deactivated cycles, gas dynamics in the manifolds and associated variation of volumetric efficiency of firing cycles. Our work analyses this phenomenon and proposes the methodology for reliable simulation of the dynamic cylinder deactivation by a 1-D code. This unveils all benefits and also the obstacles that must be coped with not even in the simulation domain, but also in the real engine control. The developed methodology is applied on a model of a spark ignition engine and first results are discussed.The topic might be also suitable for the session PFL110 0-D and 1-D Modeling and Numerics

Notes:

Vendor supplied data

Publisher Number:

2021-01-0682

Access Restriction:

Restricted for use by site license