MultiAir or Multiair is a hydraulically-actuated variable valve timing and variable valve lift engine technology enabling "cylinder by cylinder, stroke by stroke" control of intake air directly via a gasoline engine's inlet valves. Developed by Fiat Powertrain Technologies, the technology bypasses a primary engine inefficiency: pumping losses caused by restriction of the intake passage by the throttle plate, used to regulate air feeding the cylinders. Both FIRE and SGE units equipped with MultiAir use indirect fuel injection.
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| - Multiair (de)
- MultiAir (es)
- MultiAir (fr)
- Motore Multiair (it)
- MultiAir (en)
- MultiAir (pl)
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| - MultiAir ist eine Bezeichnung von Fiat für ein elektrohydraulisches Steuersystem zur flexiblen Einlassventilsteuerung in Ottomotoren. Das System wurde von Fiat Powertrain Technologies zusammen mit der Schaeffler-Gruppe entwickelt und wird von Schaeffler produziert. Das UniAir valve control system debütierte im Jahr 2009 im Alfa Romeo MiTo 1.4 MultiAir. Uniair ist die durch Forschung von Fiat entstandene grundlegende Technik, die Multiair einstweilen nur für Einlassventile einführte. (de)
- Le système MultiAir est une technique de contrôle électro-hydraulique des soupapes d'admission d'un moteur à explosion. Il permet de contrôler le débit d'air en se passant de papillon des gaz. (fr)
- Il Multiair (precedentemente noto anche come Uniair) è un sistema di controllo dell'apertura delle valvole in motori a benzina e motori diesel, brevettato da Fiat Auto nel 2002, e presentato per la prima volta su un motore di serie (motore FIRE) nel 2009, anno in cui, a partire dal 22 maggio, è iniziata la produzione nello stabilimento di Termoli, già produttore del FIRE. Nel 2010 è stata presentata anche la versione Twinair, applicata alla nuova famiglia di propulsori SGE a due cilindri, e nel 2018 l'applicazione ai motori della famiglia Firefly. (it)
- Technologia MultiAir (UniAir) – technologia elektro-hydrauliczna, która umożliwia otwieranie i zamykanie zaworów przy dowolnej zmianie faz otwarcia. MultiAir jest kompatybilny z silnikami wolnossącymi oraz turbodoładowanymi. MultiAir został opatentowany przez firmę Fiat w 2002 r. i wprowadzony na rynek w 2009 r., podczas międzynarodowego salonu w Genewie. Obecnie jest dostępny jedynie w autach koncernu Fiat, między innymi w modelu Fiat Panda, Fiat Bravo oraz Alfa Romeo MiTo. Silniki wyposażone w tę technologię są produkowane w fabryce w Termolii we Włoszech. (pl)
- MultiAir es un sistema electro-hidráulico para el control dinámico de las válvulas de admisión del motor desarrollado por Magneti Marelli y montado en algunos automóviles de Fiat Group Automobiles. Gestiona electrónicamente y de forma directa el aire que entra en los cilindros. El sistema MultiAir permite controlar la mezcla de carburante que se produce antes de la combustión, lo que redunda en una reducción del consumo, de las emisiones nocivas y una mejora de las prestaciones del motor. En un primer momento se aplicaría en motores de gasolina, pero en un futuro esta tecnología se desarrollaría también para motores Diésel. En 2009 se comercializó el primer motor con esta tecnología en la variante 1.4 de gasolina del Alfa Romeo MiTo. En julio de 2013 se presentaba para el mercado brasileño (es)
- MultiAir or Multiair is a hydraulically-actuated variable valve timing and variable valve lift engine technology enabling "cylinder by cylinder, stroke by stroke" control of intake air directly via a gasoline engine's inlet valves. Developed by Fiat Powertrain Technologies, the technology bypasses a primary engine inefficiency: pumping losses caused by restriction of the intake passage by the throttle plate, used to regulate air feeding the cylinders. Both FIRE and SGE units equipped with MultiAir use indirect fuel injection. (en)
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| - How it works (en)
- "The MultiAir system is elegantly simple. An electrohydraulic actuator—a high-response, electronically activated solenoid—controls the pressure applied to hydraulic fluid that fills a thin passageway that connects the intake valves and the camshaft. The solenoid valve regulates the amount of oil that is pumped by the cam action either to the valve or a bypass reservoir.
When pressurized, the hydraulic line behaves like a solid body and transmits the lift schedule imparted by intake cam directly to the intake valve. When the solenoid is disengaged a spring takes over valve actuation duties.
This electrohydraulic link allows independent operation of the two components, which enables near real-time control over the valve lift profiles, said Bernard. Whereas a closed solenoid transmits the pressure generated by the camshaft’s intake profile to the valve in the normal fashion, an open solenoid breaks the hydraulic link between cam and valve, decoupling their operations." (en)
- Society of Automotive Engineering, 2010 (en)
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| - MultiAir ist eine Bezeichnung von Fiat für ein elektrohydraulisches Steuersystem zur flexiblen Einlassventilsteuerung in Ottomotoren. Das System wurde von Fiat Powertrain Technologies zusammen mit der Schaeffler-Gruppe entwickelt und wird von Schaeffler produziert. Das UniAir valve control system debütierte im Jahr 2009 im Alfa Romeo MiTo 1.4 MultiAir. Uniair ist die durch Forschung von Fiat entstandene grundlegende Technik, die Multiair einstweilen nur für Einlassventile einführte. (de)
- MultiAir es un sistema electro-hidráulico para el control dinámico de las válvulas de admisión del motor desarrollado por Magneti Marelli y montado en algunos automóviles de Fiat Group Automobiles. Gestiona electrónicamente y de forma directa el aire que entra en los cilindros. El sistema MultiAir permite controlar la mezcla de carburante que se produce antes de la combustión, lo que redunda en una reducción del consumo, de las emisiones nocivas y una mejora de las prestaciones del motor. En un primer momento se aplicaría en motores de gasolina, pero en un futuro esta tecnología se desarrollaría también para motores Diésel. En 2009 se comercializó el primer motor con esta tecnología en la variante 1.4 de gasolina del Alfa Romeo MiTo. En julio de 2013 se presentaba para el mercado brasileño el Fiat 500 MultiAir Flex, el primer automóvil con sistema MultiAir y tecnología FlexFuel que permite utilizar simultáneamente como combustible para automóviles a gasolina, etanol o la mezcla de ambos combustibles en cualquier proporción. (es)
- MultiAir or Multiair is a hydraulically-actuated variable valve timing and variable valve lift engine technology enabling "cylinder by cylinder, stroke by stroke" control of intake air directly via a gasoline engine's inlet valves. Developed by Fiat Powertrain Technologies, the technology bypasses a primary engine inefficiency: pumping losses caused by restriction of the intake passage by the throttle plate, used to regulate air feeding the cylinders. Fiat S.p.A., now Stellantis, launched MultiAir in 2009 employing a proprietary electro-hydraulic system to precisely control air intake without a throttle valve, in order to increase engine power and torque, reduce fuel consumption, reduce emissions, and improve engine operation, offering "a more controllable flow of air during the combustion cycle in comparison with mechanical VVT systems." The technology allows engines to be lighter and smaller while reducing pumping losses and can be adapted to existing engines by replacing the camshaft with the MultiAir system, thus requiring a new head only. MultiAir was licensed to the Schaeffler Group in 2011, which also markets the system as Uniair. Schaeffler began supplying Uniair systems in 2017 to Jaguar Land Rover, branded as Ingenium technology. Compatible with both naturally aspirated and forced-induction engines, MultiAir technology was patented by Fiat in 2002 and was launched at the 2009 Geneva Motor Show in the Alfa Romeo MiTo. Launched in Fiat's FIRE 1.4 units, e.g., in the Fiat 500 (2007), 1.4 MultiAir engines for global markets are manufactured in Termoli, Italy at the Fiat Powertrain Technologies factory and at the FCA's Dundee Engine Plant (formerly of Global Engine Alliance's GEMA manufacturing branch), with critical systems manufactured and assembled by Schaeffler Group. In 2010, the 1.4L MultiAir engine won the International Engine of the Year as well as Popular Science's Best of What's New. In the same year, the Fiat SGE engine (0.9 turbocharged and 1.0 naturally aspirated TwinAir units), also using MultiAir technology, was launched in the Fiat 500. It is produced in Bielsko-Biała, Poland. It was named Best New Engine of 2011. Both FIRE and SGE units equipped with MultiAir use indirect fuel injection. MultiAir II, using direct fuel injection, was made available in the GME (Hurricane) and GSE (FireFly) units, starting from 2016. (en)
- Le système MultiAir est une technique de contrôle électro-hydraulique des soupapes d'admission d'un moteur à explosion. Il permet de contrôler le débit d'air en se passant de papillon des gaz. (fr)
- Il Multiair (precedentemente noto anche come Uniair) è un sistema di controllo dell'apertura delle valvole in motori a benzina e motori diesel, brevettato da Fiat Auto nel 2002, e presentato per la prima volta su un motore di serie (motore FIRE) nel 2009, anno in cui, a partire dal 22 maggio, è iniziata la produzione nello stabilimento di Termoli, già produttore del FIRE. Nel 2010 è stata presentata anche la versione Twinair, applicata alla nuova famiglia di propulsori SGE a due cilindri, e nel 2018 l'applicazione ai motori della famiglia Firefly. (it)
- Technologia MultiAir (UniAir) – technologia elektro-hydrauliczna, która umożliwia otwieranie i zamykanie zaworów przy dowolnej zmianie faz otwarcia. MultiAir jest kompatybilny z silnikami wolnossącymi oraz turbodoładowanymi. MultiAir został opatentowany przez firmę Fiat w 2002 r. i wprowadzony na rynek w 2009 r., podczas międzynarodowego salonu w Genewie. Obecnie jest dostępny jedynie w autach koncernu Fiat, między innymi w modelu Fiat Panda, Fiat Bravo oraz Alfa Romeo MiTo. Silniki wyposażone w tę technologię są produkowane w fabryce w Termolii we Włoszech. (pl)
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