The University of Southampton
University of Southampton Institutional Repository

Efficiency benefits of flexible cylinder deactivation using a novel intake valve system

Efficiency benefits of flexible cylinder deactivation using a novel intake valve system
Efficiency benefits of flexible cylinder deactivation using a novel intake valve system
Cylinder deactivation improves part load fuel economy in spark-ignition engines by reducing pumping losses. The efficiency benefits of a new intake valve system that enables flexible deactivation of different cylinders are investigated in this study. The intake valve system involves two intake valves in series, with a fast solenoid-actuated valve upstream of a conventional cam-actuated intake poppet valve. Compared to conventional cam-actuated variable valve timing, the new valve system has potential to achieve a high degree of flexibility in respect of the timing of inlet valve closure, while requiring lower actuation forces than fully-flexible valve actuation systems that act directly on the poppet valves. The fuel economy benefits provided by a number of valve control strategies are evaluated using a one-dimensional modelling approach, considering a vehicle following the New European Drive Cycle. Use of the intake valve system to control load by deactivation of different percentages of firing strokes is predicted to offer a very substantial improvement in fuel economy, achieving as much as a 43% fuel saving over the New European Drive Cycle compared to throttled engine operation. Use of flexible cylinder deactivation also affords fuel savings and thermal management benefits compared to more conventional cylinder deactivation schemes in which a fixed subset of the cylinders, typically one half, are deactivated at one time. The use of the valve system to make fine adjustments to the intake valve closure timing, as opposed to deactivation, is also discussed.
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Soriano, B.S.
e89a5a2f-550f-43fb-ad3d-05375c48e6a2
Middleton, M.
22eb7c91-ab17-4847-8e6e-b1cf22ae9d34
Gill, M.
bd3dfdb2-a9cb-47d6-8d2e-4db8d728e335
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Soriano, B.S.
e89a5a2f-550f-43fb-ad3d-05375c48e6a2
Middleton, M.
22eb7c91-ab17-4847-8e6e-b1cf22ae9d34
Gill, M.
bd3dfdb2-a9cb-47d6-8d2e-4db8d728e335

Richardson, E.S., Soriano, B.S., Middleton, M. and Gill, M. (2017) Efficiency benefits of flexible cylinder deactivation using a novel intake valve system. SAE 2017 Powertrains, Fuels and Lubricants, , Beijing, China. 16 - 19 Oct 2017. 9 pp . (Submitted)

Record type: Conference or Workshop Item (Paper)

Abstract

Cylinder deactivation improves part load fuel economy in spark-ignition engines by reducing pumping losses. The efficiency benefits of a new intake valve system that enables flexible deactivation of different cylinders are investigated in this study. The intake valve system involves two intake valves in series, with a fast solenoid-actuated valve upstream of a conventional cam-actuated intake poppet valve. Compared to conventional cam-actuated variable valve timing, the new valve system has potential to achieve a high degree of flexibility in respect of the timing of inlet valve closure, while requiring lower actuation forces than fully-flexible valve actuation systems that act directly on the poppet valves. The fuel economy benefits provided by a number of valve control strategies are evaluated using a one-dimensional modelling approach, considering a vehicle following the New European Drive Cycle. Use of the intake valve system to control load by deactivation of different percentages of firing strokes is predicted to offer a very substantial improvement in fuel economy, achieving as much as a 43% fuel saving over the New European Drive Cycle compared to throttled engine operation. Use of flexible cylinder deactivation also affords fuel savings and thermal management benefits compared to more conventional cylinder deactivation schemes in which a fixed subset of the cylinders, typically one half, are deactivated at one time. The use of the valve system to make fine adjustments to the intake valve closure timing, as opposed to deactivation, is also discussed.

Text
Richardson_FlexibleValveTrain_SAE_2017 - Author's Original
Restricted to Repository staff only
Request a copy

More information

Submitted date: 20 May 2017
Venue - Dates: SAE 2017 Powertrains, Fuels and Lubricants, , Beijing, China, 2017-10-16 - 2017-10-19
Organisations: Education Hub, Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 410103
URI: http://eprints.soton.ac.uk/id/eprint/410103
PURE UUID: cc320879-c0b4-44f1-91b3-9ba745ff3710
ORCID for E.S. Richardson: ORCID iD orcid.org/0000-0002-7631-0377

Catalogue record

Date deposited: 03 Jun 2017 04:03
Last modified: 16 Mar 2024 04:05

Export record

Contributors

Author: E.S. Richardson ORCID iD
Author: B.S. Soriano
Author: M. Middleton
Author: M. Gill

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×