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Uniair valve control cuts CO2 emissions

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By Schaeffler on 24th November 200915th December 2015

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A system for automotive power transmission systems has been launched, which reduces vehicle fuel consumption and cuts CO2 emissions by up to 25 per cent.

Uniair, a joint development between Schaeffler and Fiat Powertrain, is a fully variable hydraulic-valve-control system that will make its debut on Fiat’s Alfa MiTo 1.4 Multiair.

As well as offering car manufacturers a more compact valve-control system, Uniair will help the automotive industry meet future CO2 emissions targets for passenger cars.

Uniair provides improvements in startup, part load and acceleration behaviour of the vehicle.

During the engine warmup phase, for example, hydrocarbon (HC) emissions are up to 40 per cent less and nitrogen oxide (NOx) is reduced by up to 60 per cent.

Uniair offers higher engine torques and optimised engine response, enabling car engines to be downsized.

Fiat uses Uniair in its four-cylinder Fire series of engines and in its small-volume two-cylinder engines.

As well as petrol engines, Uniair will also be available for diesel-engine applications.

Developed for series production by Schaeffler, Uniair refers to the system as Multiair.

Uniair is a cam-actuated, electro-hydraulic valve-train system.

The fully variable valve control can be used for petrol and diesel engines and is supplied via the existing engine oil circulation system.

For petrol engines, Uniair enables throttle-free, continuously variable, software-based load control across the entire engine map.

With diesel engines, regulation of the temperature of the combustion chamber is achieved due to the precise control of exhaust gas recirculation rates.

At the same time, the effective compression ratio in the cylinder can be varied and a homogeneous combustion ensured.

Uniair allows variations in the valve stroke and also in the opening and closing of valves several times during one cycle, at different points in time.

Uniair can provide full coverage of every airflow possibility, from zero lift to maximum lift, dictated by the camshaft lobe for each individual cylinder or valve.

With the de-throttling of the engine, Uniair can provide early intake-valve closing or late intake-valve opening in order to maximise engine breathing relative to certain engine speed and load conditions.

Uniair offers unique valve lift events for every valve – individually and cycle to cycle.

Schaeffler

Contact Supplier Visit our website 0121 351 3833

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