Mechanical and turbocharging
Mechanical supercharger is a way to increase the output of power wheel without increasing the engine exhaust.Direct use of engine output to drive the supercharger, and then high density air into the cylinder to increase the engine output power.
Turbocharging USES engine exhaust to drive the compressor.The earliest Supercharger are all Mechanical pressurization, said he had just invented when the super Supercharger (Supercharge), later after turbocharged invented in order to separate the two, the Turbocharger is called Turbo Supercharger, Mechanical pressurization is referred to as Mechanical Supercharger, over time, both respectively be simplified for the Turbocharger and the Supercharger.
Turbocharger Turbocharger and Supercharger Turbocharger Turbocharger side Turbocharger Turbocharger, mechanical Supercharger
directory
1 principle of pressurization
Squid mechanical supercharger
Fluid turbocharger
Student: the distinction between the two
2 pressurization method
Fishery mechanical supercharging
Fishery turbocharging
3 advantages and disadvantages of supercharging
Turbo principle
Mechanical supercharger
The driving force of the compressor comes from the crankshaft of the engine. In general, the crankshaft pulley is connected by the belt.Depending on the structure, there are many types of mechanical supercharging, including Vane, Roots, and winkle
Mechanical pressurization
Mechanical pressurization
Wankle and other types, and piston movement was originally considered to be a kind of mechanical supercharging, to date, with the most extensive use of the lu's supercharger, is a popular modification.Roots supercharger has double leaf and three-bladed rotor two types, the current in the futaba rotor is relatively common, its structure is in the oval shell containing two cocoon shape rotor, keep a tiny gap between rotor and not directly connected, by helical gear moving, one of the rotor shaft and the driven pulley, the pulley of the rotor shaft is equipped with electromagnetic clutch, without charging is out on the clutch booster to stop, when the clutch is controlled by computer in order to achieve the purpose of fuel economy.The characteristics of the supercharging, in addition to the pressure can be obtained in low speed, pressurization of the power output is proportional to the crankshaft speed, and also the mechanical turbocharged engine, following the increase of rotational speed, the supercharger output increases, therefore mechanical turbocharged engine operation with naturally aspirated, but can have larger horsepower and torque.
turbo-charger
Principle of using the waste gas discharged when engine is running, use waste gas to turn the exhaust side in the turbocharger rotor, rotor and rotor inlet side and the exhaust side is coaxial different room, when the exhaust of the turbocharger rotor side reaches a certain speed (about 12000 RPM) it to drive on the other side of the inlet side of the rotor, the fresh air in the inlet side of the rotor introduce foreign, compressed into the intake manifold, thus turbo engine intake is a natural way, is a "sucks, and then compress" so air pressure is greater than the atmospheric pressure.Turbocharging is the key to the removal of high temperature or excess pressure due to the high speed of the bearing.At present, it is commonly used to lubricate and cool the bearings by oil inlet, and it is also used for water-cooled bearings.And high pressure on the engine (explosion) of the compression stroke and power stroke occur, so by air pressure switch has a mechanical or electronic to discharge pressure action directly controlled by computer.
The difference between the two
Mechanical supercharging is the use of the engine's own power, to drive a compressor, to pressurize.Supercharger will consume the power of engine, its speed changes according to the engine speed, there will be no turbo lag, the engine running at low speed when the effect is very good, but it is restricted by engine speed, engine under high speed condition it will pressurization.
Turbocharging is to use the exhaust gas produced by the engine to drive the turbofan in the exhaust pipe to drive the turbofan in the inlet pipe to rotate indirectly, without consuming the power of the engine.The turbocharger speed is very high and the increased pressure is several times higher than the mechanical supercharger.However, due to the inertia of the turbofan and the considerable resistance of the middle bearing, the turbofan speed will not increase at the same time when the exhaust gas suddenly increases, which is called turbine hysteresis.
Pressurization method
Mechanical pressurization
This type of supercharger is a way to increase the output of power wheels without increasing the engine exhaust.Direct use of engine output to drive the supercharger, and then high density air into the cylinder to increase the engine output power.
turbo
Turbocharging USES engine exhaust to drive the compressor.The earliest Supercharger are all Mechanical pressurization, said he had just invented when the super Supercharger (Supercharge), later after turbocharged invented in order to separate the two, the Turbocharger is called Turbo Supercharger, Mechanical pressurization is referred to as Mechanical Supercharger, over time, both respectively be simplified for the Turbocharger and the Supercharger.
Pressurization pros and cons
Two supercharging ways each have advantages and disadvantages, and in a turbocharged, in theory, is to cylinder body was designed, the cylinder wall is thick enough, withstand the pressure, as long as the increase in the size and number of the ontology of the turbocharger and turbo strength almost unlimited increase.One of the most famous example is the HONDA depot provided to McLaren f1 turbocharged engine, exhaust, but only 1500 ml, but the power output can be as high as 1500 dead!
Ferrari's schumacher has the famous bugattieb110 supercar with a 3.5-litre displacement, but the heart of the V12 is connected by four turbine rotors.The horsepower output can also be as high as 560 horses.
But everything is good is bad, rely on a turbocharged increase power output, although easy, but with the pressure generated by high fever must be properly handled, a high temperature will affect the two parts, one is responsible for the direct cooling and lubricating oil, it can due to high fever and rapid oxidation.Therefore, the turbocharged engine must choose high quality engine oil that is resistant to high temperature and oxidation, and the oil replacement cycle will be shortened accordingly, so it is not easy to produce oxides.Usually corresponding way is by adding plant oil cooler, to avoid the oil temperature is too high, the service life of the finished oil, this is why the design precision of some of the turbocharged car, in addition to the oil pressure gauge will also have a oil thermometer.So that the owner can keep an eye on the oil.
The other thing that's affected by the high temperature is the cooling system, in the inlet.In order to increase the intake of oxygen, turbocharged cars mostly can increase the air Cooler (Intel - Cooler), to reduce the temperature of compressed air, cooling water tank, thermostat will also increase, increase the cooling efficiency, and appropriate so in recent years has rarely heard of turbocharged engine has bad heat dissipation.
But there are a few tricks to using and maintaining a turbocharged engine, such as trying not to pull the turbine up close to the destination.Keeping the engine idle for at least a minute before parking and not letting the turbine rotor run too long without oil will help keep the car in good condition.
Relative to a turbocharged cars, many mechanical pressurization car is simple, as long as the engine running in principle, mechanical pressurization is naturally produced, engine speed, the higher the greater the pressure strength, is the kind you get no turbo lag phenomenon, accelerate feeling quite linearization, and naturally aspirated engine difference is not big, but the drawback is supercharger driven by belt, a driving force or engine, thus for fuel consumption performance.Depot in order to improve this phenomenon, and allow the pressure strength can play a role in most need, equipped with solenoid valve and the clutch, also let the supercharger in certain speed above the clutch to engage, drag supercharger, but so many would like a turbocharger lag.All this require after years of accumulation, to touch the doorways and the details of control, it is therefore the more uncertain project, depot, the more don't like to touch, lest accidentally hit the signboard, over time, turbo and supercharging genre is produced naturally.
