UniAir Valve Control for Ingenium Petrol Engine
The new Ingenium petrol engines from Jaguar Land Rover will be equipped with the current generation of Schaeffler’s fully variable electro-hydraulic valve control system UniAir, the Herzogenaurauch-based supplier has just announced. The company claims that this technology can lead to significant reductions in fuel consumption and emissions, as well as significant improvement in torque curves. By using UniAir, customised operating strategies for modern combustion processes, such as the Miller and Atkinson cycles, can also be set up. For this purpose, UniAir controls the engine valves based on cycles, and offers an extended range of strategic options for matching the engine operation to the specific situation and requirements.
In the specific case of the newly developed four-cylinder petrol engine series, the UniAir system is combined for the first time with two hydraulic camshaft phasing units in accordance with customer-specific requirements. The additional degree of freedom offered by the system with its optimised mass design enables the engine to operate in an even broader spectrum of the data map with optimum efficiency. This means, for example, that the engine can be switched off in start-stop operation and restarted straight away, keeping vibrations to a minimum. Another advantage is the fast and precise control of the valves to match the relevant cycle. This allows an instant increase in torque without impairing the efficiency in the process due to excessive retardation in the ignition timing.
According to Schaeffler, the first worldwide fully variable electro-hydraulic valve control system UniAir went into volume production in 2009, and as Professor Peter Pleus, CEO Automotive Schaeffler AG, explains, “We are continuously developing UniAir technology in order to meet the increasing demands of our customers to produce drives that reduce fuel consumption and emissions.”