The only other brand that today has something similar in their gasoline engines. This is BMW (and Mini) and fully open system Galvanometric variable intake valves, in this case driven by the camshaft and without butterfly, which works with the same engine lubricating oil, ie, reliability maximum and applied to atmospheric and turbocharged engines with direct injection. Multiracial system logo at the top nice engine, the only place where it appears.
According to Fiat, compared with a conventional gasoline engine of equal size, offers more power (up to 12%) and torque (up to 15%), while consumption is lower (up to 16%), with lower CO2 emissions (up to 16%), and fewer particles (up to 40%). It even allows internal recirculation of exhaust gases through the reopening of the intake valves during the exhaust, causing a reduction in emissions of 40% of HC / CO and 60% of NOx.
All an invention, with a high development potential ahead by ensuring the reliability (Fiat patent is put into production but is Bosch) and also apply to diesel engines. The difference is remarkable about the old 1.4 turbo 120 hp with conventional admission, which approved 6.6 l/100 km and 155 g / km respectively, although some of this reduction is attributable to the start & stop system.
Multiracial system (press file)
The operating principle of the system applied to the intake valves is as follows: a piston driven by a mechanical cam (1), is connected to the inlet valve by a hydraulic chamber controlled by a solenoid valve, the ON / OFF, normally open.
Drawing of the multilateral system of Fiat in red are the two exhaust cams camshaft for a cylinder and then green, the 3rd cam to activate the system Multiracial admission. The four equal sets consisting of the Multi (one per cylinder) should be considerably more expensive than a traditional intake system with camshaft and reliability, necessarily smaller. View of the 3 rd cam that drives the system Multi from the other end of the exhaust camshaft and from the same side of the engine.
When the valve is closed, oil in the hydraulic chamber behaves like a solid body and transmitted to the intake valves appellate law imposed by mechanical suction cam. When the valve is open, the hydraulic chamber and the intake valves are separated and do not follow the intake cam, closing due to the spring force. The final part of closing, the valve is controlled by a specific damping, which ensures a smooth closing and regularly in all operating conditions.
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