supercharger means for naturally aspirated engine intake air will be low efficiency in a high rotational speed region, to proceed from the most basic keys, which is to find ways to improve the air pressure in the intake manifold, a valve to overcome interference resistance, although the intake manifold, a valve, a camshaft dimensionally stable, but the result of increased intake air pressure, so that each valve opening time can squeeze combustion air is increased, and therefore the fuel injection amount can be relative increase, so that the work of energy more powerful engine than the previous supercharged.
1. Supercharged noun
supercharger means for naturally aspirated engine intake air will be low efficiency in a high rotational speed region, to proceed from the most basic keys , is to find ways to improve the air pressure in the intake manifold, a valve to overcome the resistance of the interference, although the intake manifold, a valve, a camshaft dimensionally stable, but the result of increased intake air pressure, so that each valve opening It can squeeze into the air within the combustion chamber increases, and therefore the amount of fuel injection can be relatively increased, so that the work of energy more powerful engine than the previous supercharged.
mounted on a vehicle with a supercharger,Initially are supercharged, when just invented called supercharger (Supercharge), then after turbo invention to distinguish between the two, at first turbocharger is called Turbo Supercharger, the supercharger is called Mechanical Supercharger. Over time, the two were to be reduced to a Turbocharger and Supercharger.
2. The characteristics of supercharged
turbo supercharger with a clear difference in the power output, the former has a linear output close naturally aspirated, and the latter because of turbo lag phenomenon, contribute relatively little awkward, not so linear.
Since the actuation principle of the supercharger, it can be obtained at low speed boost. Boost power output and also a certain proportion to the rotational speed of the crankshaft, i.e., supercharged engine output power with increasing speed, also increases. So very similar output performance supercharged engine with natural gas, but it can have a greater horsepower and torque.
Because the supercharger is driven by belt characteristics, the supercharger speed and the engine speed of the internal vanes is fully synchronized, the basic features are:
Engine rpm X (R1 / R2) = rpm of the turbocharger vane
the radius R1 of the engine belt disk
the radius R2 of the belt pulley supercharger
and the supercharger rotational speed since the engine a supercharger driven by an internal mechanism. Its overall structure is simpleOperating temperature between 70 ℃ -100 ℃, than by the exhaust gas-driven turbocharger is a high temperature environment of 400 ℃ -900 ℃ much more comfortable. Accordingly, supercharger systems substantially identical to the cooling system, lubrication system requirements and NA engine, mechanical maintenance procedures also similar.
Further, the supercharger small size advantage, without modifying the engine body, easy to install, thus modified sector in the United States is also popular. NA vehicle originally designed for large displacement, especially suitable for conversion.
touring car racing in the modified To remove the air conditioning compressor, and equation (Formula) racing, and even start the motor, oil pump had been turned into an external connection, the objective is to reduce the burden on the engine caused.
powered by engine driven supercharger, as with the above components, will bring an additional burden to the engine. Therefore, the supercharger itself running resistance must be as small as possible, it will not drag on the efficiency of the engine, the engine speed upgrade to faster.
However, the amount of intake air is proportional to the supercharger resistance relation. When high supercharging, although the engine output power increase, but the relative wind receiving blades booster internal resistance will be increased when the resistance reaches a certain limit, the resistance will make the engine under great loads, severe enhance the impact speed. Thus, the mechanical supercharger must strike a balance between value and supercharged engine load, in order to avoid the negative effects of high pressurized brings.
Currently, the European design supercharger, mostly between low boost 0.3-0.5bar, focusing on “plateau” horsepower output torque at low speed and high speed output. Taiwan, “Daka” research and development of new high-efficiency turbocharger can produce moderate 0.6-1.2bar boost the value of the power to enhance the range is more significant. Although at this stage supercharger system is still unable to break through the high range 1.5bar of boost, turbocharged already exceeded the realm of ultra-high pressure 2.2bar, the single terms of efficiency, turbocharged system can use “multiple” to enhance engine output, but to pay the money, maintenance, and multiple peripheral integration is supercharged, which one is better, it pleases the reader to judge.
3. Supercharged type
supercharger is divided into three categories.
● centrifugal supercharger (Centrifugal Superchargers): This supercharger and turbocharger like, but it is not driven by exhaust gases of the engine, but the engine with a belt drive. It turbo supercharger and the same principle, the intake air pressurized air by centrifugal force, to achieve the purpose of the compressed air.
● substantially supercharger (Roots Superchargers): You often see the car in the muscles of the 1960s and 1970s saw the thing, it protruding from the engine cover is obvious, as in this FIG. Like cars Mustang sports car. This supercharged air into the interior of the turbocharger, there are two helical blades compressed air, to the intake manifold after the inside. This can provide a powerful supercharged torque output. It is very popular in the accelerating race and street competitions.
● spiral supercharger (Screw Superchargers): This is the basic form of a booster-type derived, but also looked like, but they are very different compression intake. When air is drawn into the booster, spiral blade is forced into the intake manifold. This form is very effective for enhancing the supercharger rotation speed of each horse.
4. Supercharger installed in an engine
supercharger installation on a gasoline engine with a turbocharger as may be with an intercooler. This supercharger has a special design of the bypass valve, the degree of vacuum which is generated by the engine throttle. When the engine without the supercharger, the supercharger bypass valve will cause air circulation, in order to save energy. Base engine air intake system with integral mounting the supercharger. Because each engine installation has unique requirements, so most of the supercharger are designed for a particular engine.