Supplier Spotlight

Video Exclusives

Mercedes-Benz unveils its revamped G-Class

gtr

The all-new G-Class makes its public debut at the Detroit auto show in G550 form. Completely redeveloped and fitted with a 4.0-liter V8 biturbo gasoline engine offering 427ps and 450 lb-ft of torque at 2,000rpm to 4,750rpm, despite near-identical looks to its predecessor plenty has changed for the Mercedes-Benz SUV.


Ford’s F150 pickup gets its first diesel motor

gtr

Developed by the powertrain team behind the 6.7-liter Power Stroke engine for super duty trucks, the all-new 3.0-liter V6 Power Stroke unit promises 250ps, 440 lb-ft of torque, and an anticipated 5175kg of towing capacity.


Click here/on image to watch video

In light of Fisker's solid-state battery breakthrough and claims of a one minute charge time, will this electric vehicle technology development kick-start mass BEV uptake? 

News

Eaton launches new variable valve actuation system

Eaton has announced that it is 'the first tier one supplier in the automotive industry to develop a production-ready electromechanically actuated, component-based VVA (variable valve actuation) system'.

The system is claimed to have several advantages over existing hydraulically actuated variable valve actuation systems, including reduced fuel consumption and increased engine efficiency, and is ideally suited to address future emission standards. Several OEM partners are currently evaluating the design in next generation engine tests.

The electromechanical actuation system can be used with all SRFF (switching roller finger follower)-based VVA solutions to enable functions such as cylinder deactivation, Miller cycle, internal exhaust gas recirculation (iEGR) or early exhaust valve opening. The actuation system has already undergone extensive rig and fired testing on a diesel engine providing internal exhaust gas recirculation (iEGR) functionality. The immediate benefit from using this new electromechanical actuation system versus a conventional hydraulic system is consistently fast response time regardless of the engine temperature or speed.

A growing proportion of vehicle manufacturers are looking to VVA as a means of meeting fuel consumption, engine efficiency and emission targets without compromising the engine's performance capabilities. However, current series production component-based VVA systems rely on electrohydraulic actuation of switchable roller finger followers (SRFFs), and this technology has a number of limitations.

The reliance on hydraulic oil - which is susceptible to variances in temperature and pressure - impacts the speed, predictability and consistent repeatability of VVA activation and deactivation through the driving cycle. In addition, hydraulic systems require higher oil-flows which contribute to parasitic energy losses.

Different predefined groups of rocker arms can be actuated electrically to each act on either intake or exhaust valves. This allow for various combinations of valve-lift profiles to be utilized by combustion engineers to minimize emissions without compromising performance. Switching to a new VVA profile by the ECU can be completed in less than 35 milliseconds at less than -7°C.

In addition to faster actuation, the new electromechanical system has a far greater degree of consistency and predictability and is available at an engine-off condition even before cranking.

With greater confidence of the system's speed, repeatability and consistency, engineers can design the combustion strategy more precisely. This is crucial for vehicle manufacturers that need to maximise engine efficiency through the entire drive cycle in order to meet increasingly stringent emissions standards. The system provides unique advantages in reducing emissions at cold temperatures where an after treatment system does not work.

With the design of the electromechanical actuation system being production ready today, Eaton is already developing the next generation actuation system. The next system will give customers full control over every individual SRFF while significantly reducing packaging requirements compared to current hydraulic actuation systems.

"Eaton has a long history of leadership in valvetrain developments and this is the next major step forward," said Carlo Ghirardo, president Vehicle Group EMEA at Eaton. :This latest technology supports our customers by meeting future consumer and legislative demands for increased efficiency and lower emissions. We look forward to delivering this technology for the next generation of automobiles."

1 March 2017


RECEIVE THE
LATEST NEWS


Your email address:





Read Latest Issue
International Engine of the Year Awards
Read Latest Issue

Web Exclusive Articles

Hyundai 2019 Veloster N: The Knowledge
Designed specifically for the US market and officially unveiled at the 2018 Detroit auto show this month, Hyundai’s 2.0-liter turbocharged Veloster N has been developed to deliver driveability rather than outright performance statistics.
Read Now

Renault Trucks reveals how mixed reality can improve engine quality control
Renault Trucks, in collaboration with Immersion, is evaluating the potential of mixed reality to deliver a new, faster and more reliable quality control process at its Lyon engine manufacturing site.
Read Now

BAIC Motor on the industry’s fuel economy performance ambitions
BAIC has teamed up with Siemens to implement vehicle energy management and model-based systems engineering as the Chinese OEM works towards optimal fuel efficiency
Read Now

Read Latest Issue

Supplier Spotlight

Supplier SpotlightClick here for listings and information on leading suppliers covering all aspects of the engine technology industry. Want to see your company included? Contact aboobaker.tayub@ukimediaevents.com for more details.

Submit your industry opinion

Industry BlogDo you have an opinion you'd like to share with the engine technology community? We'd like to hear your views and opinions on the leading issues shaping the industry. Share your comments by sending up to 500 words to d.slavnich@ukimediaevents.com

Submit Your Recruitment Ad

Recruitment AdTo send us your recruitment advertising or to receive information on placing a banner please email aboobaker.tayub@ukimediaevents.com