FSI is "Fuel Stratified Injection" acronym, which means fuel stratified injection, also known as "gasoline direct injection." Is the mass of its first diesel engine cylinder direct injection gasoline engine technology into the field of a revolutionary innovation. In layman's terms is to separate gasoline and air into the combustion chamber, air-fuel ratio control is more precise, which makes the combustion more complete, in order to achieve more fuel-efficient, more environmentally friendly goals.
FSI petrol direct injection gasoline engine technology represents the latest development. Usually uses a gasoline engine and air intake manifold in the mixture into the combustion chamber, and sucked gasoline direct injection gasoline directly into the combustion chamber, through the uniform combustion and stratified combustion, reduced fuel consumption , power is also greatly improved.
FSI engine with variable intake manifold, controlled by the electronic system air flow required to achieve a non-adjustable throttle deterioration and improve the volumetric efficiency, resulting in higher power per liter, while the dynamic response of the engine becomes more directly and quickly.
Accompanied by a variable intake manifold intake valve guide, by a stepper motor to adjust its position so that you can according to engine speed and load conditions to properly control the air flow and swirl. Fuel and air mixture in the combustion chamber evenly distributed, can naturally enhance the power, so in the larger engine speed range on each operating point can be quickly and fully burning.
FSI technology, fuel is sprayed directly into the combustion chamber, nozzle position from the intake manifold directly to security in the combustion chamber at the top, high pressure solenoid injector fuel injection time control will be in thousandths of seconds. All share a build cylinder pressure device - common rail system. Nozzle on the fuel supply control can be accurate to milliseconds, up to 110 bar injection pressure, and manifold pressure jet injection system only between 4 bar to 6 bar.
Spray nozzle are controlled in time within a thousandth of a second, the fuel in the most appropriate time directly into the combustion chamber, through the special geometry of the combustion chamber, so that the mixture can produce a strong vortex full of air and gasoline Hybrid. Then the area around the spark plug can have darker mixture, other surrounding areas have a more dilute mixture, to ensure smooth ignition in the case of as much as possible to achieve lean combustion. This is the essence of stratified combustion. Another advantage of direct injection engine ignition cut off after the mixture to the cylinder wall and cylinder head cooling, which reduces the engine's heat loss.
The principle of direct injection gasoline engine can be characterized by two different oiling patterns, that is layered and uniform oiling oiling patterns. In the half-open throttle condition, the hierarchical approach can be fully grease the economic benefits of fuel, because then only in the spark plug only needs around oil and gas-rich gas mixture can be triggered. Elsewhere in the combustion chamber only into the air with a high percentage of oil and gas mixture. In everyday driving conditions, the direct injection gasoline engine technology, fuel economy will be more significant, because the driver can continuously back and forth and even replace the use of hierarchical oiling oiling the two modes. Direct injection gasoline engine fuel injection technology has been able to achieve the layered principle, because it can control the combustion chamber fuel injection process, and before the completion of the trigger directly into the fuel. This can significantly reduce the burning of the fuel required - which is the most important economic engine FSI prerequisite.
Four-valve cylinder head uses low-friction roller cam tappet valve train, the geometry of the inlet from the naturally aspirated FSI engine, which can produce a stronger swirl, both to ensure the accuracy of the work but also improve the anti- knock level, thereby enhancing the efficiency of the engine. Therefore, the turbocharged engine's compression ratio up to 10.5:1, this figure was only naturally aspirated engine to achieve, with manifold injection engines and conventional turbo engines compared to the compression ratio and gasoline direct injection of superior performance is to improve the thermal efficiency of the key factors.
Double the speed of rotation of the crankshaft balancer shaft offset from the two engines used to power within the movement, and to ensure a high standard of low-noise engine, four-cylinder engine can achieve the best state. Gasoline direct injection technology, the most significant advantage is in providing greater power and torque while improving fuel economy and reduced emissions.
FSI engine provides greater power and torque, while further improving the engine's fuel economy and lower emissions. With the same engine displacement compared to the traditional, FSI engine has significantly lower fuel consumption, increasing energy shortage today more than ever to their advantage.
In recent years the application of evidence, in the same displacement, FSI than traditional MFI (multi-point fuel injection intake manifold) significantly increased power, higher power and torque output, fuel consumption can be reduced by 15%, in order to achieve the engine power and fuel economy of the perfect combination of today's automotive engine technology is the most mature and most advanced fuel injection technology, and lead and extended the gasoline engine trends.
By the FSI engine series inspired by the success, the public and then launched with turbocharger (Turbocharged) of the TFSI engine series.
TFSI engine series retains the abbreviation FSI goes without saying that it is still "gasoline direct injection." But abandoned the stratified charge mode and committed to improving the power and torque. Replaced by a homogeneous inflated and turbo mode effects. Hierarchical model that TFSI canceled and nitrogen oxide sensor, focusing more on higher power and speed brought about by the traction and driving pleasure and exceptional economy.
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