Valve actuation parameters like lift, opening and closing times affect performance and emissions of an engine. In this work, a new hydraulic variable valve actuation (VVA) concept is explained, simula....
Electro-pneumatic valve actuators are used to eliminate the cam shaft of a traditional internal combustion engine. They are used to control the opening timing, duration, and lift of both intake and ex....
Camless variable valve actuation (VVA) technologies have been known for improving fuel economy, reducing emissions, and enhancing engine performance. A family of VVA designs from LGD Technology, LLC (....
Today INA Schaeffler KG is known for its Variable Camshaft Phasing systems (VCP) throughout the world. VCPs are standard on many production engines world wide today due to their ability to positively ....
Most of car manufacturers and OEM are currently working on air intake improvement in order to reduce emissions and fulfill the always more demanding ecological regulations. Electric actuation is a rel....
In the North American automotive market, cylinder deactivation by means of engine valve deactivation is becoming a significant enabler in reducing the Brake Specific Fuel Consumption (BSFC) of large d....
The concept of the Early or late Intake valve closing cycle has been examined over the years as a technique for improving fuel economy in conjunction with the use of a three-way catalyst for excellent....
Electro-Hydraulic Valve Actuation (EHVA) is one of the most promising ways to improve the performance and reduce the emissions of the diesel engines. The EHVA gives fully variable lift and event durat....
To make electrical or electro-hydraulic gas exchange valve actuators more economically feasible for the production of cam-less engines, it is desirable to achieve valve position information from exist....
2-Step variable-valve lift and timing is a high-value technology for the further development of automotive internal combustion engines. 2-Step valve train systems provide improved engine efficiency, e....
Modern engines are becoming highly complex, with several strongly interactive subsystems - - variable cam phasers on both intake and exhaust, along with various kinds of variable valve lift mechanisms....
The part-load fuel consumption potential of unthrottled engine operation using variable valve actuation is evaluated for a single-cylinder version of the GM 3.4 L DOHC engine. The investigation focuse....
Dynamic analysis has shown that for a V-6 engine with a DOHC valvetrain layout, a Cam Torque Actuated phaser can be actuated rapidly enough to have the net effect of retarding the valve opening and ad....
