Eaton says several OEMs are evaluating the design in their next-generation tests. The system offers several advantages over existing hydraulically actuated VVAs, it says, including lower fuel consumption and increased engine efficiency, so is ideally suited to address future emission standards.
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 system has already undergone extensive rig and fired testing on a diesel engine providing internal exhaust gas recirculation (iEGR) functionality. The immediate benefit is consistently fast response time, regardless of 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 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.
Carlo Ghirado, president of Eaton’s vehicle group EMEA, describes the development as “the next major step forward”.
He adds: “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.”