Always On The Lookout: Virtual cam reduces specific fuel oil consumption (SFOC); now available for mechanical engines

摘要

MAN Diesel & Turbo has introduced EcoCam, a retrofit solution offered for low-speed, mechanical engines with a single turbocharger. The MAN EcoCam is a "flexible cam profile" called a virtual cam. The profile is controlled hydraulically by adjusting the amount of actuator oil in the hydraulic pushrod. As a result, the exhaust valve can start closing earlier and the P_(max) cylinder pressure can be increased at low-load for engines that were originally optimized for high-load performance. MAN said that until now, flexible exhaust-valve timing has only been available for electronically controlled engines and not possible for mechanical engines.