VW EA888 engine series was born in 2006, relative to the EA111, EA113 series engines will have to “young” much more. Volkswagen EA888 engine is a newly designed engine, a collection of direct injection, turbocharging, variable valve series of advanced technology in a positive, to achieve a combination of environmental and economic power.
1.EA888 two displacement engine
EA888 series 1.8L and 2.0L engine comprises two displacement: 1.8TSI maximum power of 118kw -5000-6200rpm (160PS), maximum torque of 250Nm-1500-4500rpm; 2.0TSI maximum power of 147kw (200PS) -5100-6000rpm, maximum torque of 280Nm-1700-5000rpm.
Both the mechanical structure of the engine displacement basically the same, except that the length of the crankshaft and the piston rod 2.0TSI than 1.8TSI link has been shortened, increasing the radius of the crank shaft, to increase the displacement. Both the top structure of the piston are different, primarily in order to adjust the working volume of the combustion chamber, thus ensuring consistent compression ratio to achieve the same effect combustion.
The first China-made equipment to the EA888 engine series FAW – Volkswagen Magotan and the Shanghai Volkswagen Octavia models. EA888 engine series as one of the main engines of the current Volkswagen, Volkswagen is now mounted on a variety of models, including the FAW – Volkswagen CC, Sagitar, Shanghai Volkswagen Tiguan, Passat and so on.
The technical characteristics of the engine 2.EA888
1. The intake variable valve timing [ 123]
EA888 engine with an intake variable valve timing, the intake and exhaust efficiency can improve. Mainly achieved by a valve located in the inlet vane-type hydraulic actuator variable camshaft timing.
vane adjuster by the housing body, the internal rotor blade and a lock pin located inside the rotor blade components. When the outer housing is fixed to an external spur gear, driven by the crankshaft. And the interior of the blade directly fixed to a camshaft and an intake valve and rotate together therewith.
works mainly by a respective camshaft adjuster valve control conduit hydraulic oil to the actuator driving blade, and further driven camshaft rotates, the realNow the valve to advance or retard opening and closing, the adjustable range of up to 60 ° of crank angle.
2. The direct injection system
fuel supply system is to achieve the most critical part of the in-cylinder injection, the pressure of fuel to be injected into the cylinder is very high, you must have sufficient ejection pressure.
is the key to the high-pressure fuel pump pressurizing fuel, the EA888 engine fuel pump is a simple structure of a single piston pump, against the four intake camshaft ( four-point) to drive the cam. Four-point of the cam stroke and the fuel supply to enable each cylinder during the respective fuel injection synchronization, cylinder fuel injection and repeatability of better uniformity.
The high pressure fuel pump to generate hydraulic pressure of 150bar maximum, according to engine operating conditions require, by adjusting the hydraulic control valve, fuel pressure can be adjusted between 50bar-150bar. 6 mixed thoroughly using a cone angle of 50 °, more conducive to petrol and air jet hole injector nozzle.
3. The water-cooled turbocharging
of the engine and a turbocharger exhaust pipe using an integrated design, thus reducing the excess part to a certain extent volume and weight, so that the system is relatively stable and reliable.
turbocharger cooling system, the coolant conveyed by the primary cooling circuit from the auxiliary pump to the charge air cooler cooler and an exhaust gas turbocharger. It includes two circulation passage is through a turbocharger, a turbocharger system for cooling; the other is through the cooler within the intake manifold, a charge-air cooling.
4. The intake manifold flap
By controlling the intake manifold opening and closing the flap, to meet the needs of the pneumatic engine in different conditions. The engine operating condition at low speed, the intake manifold by closing the flap the intake passage, the air flow through the cross section can be reduced, the air velocity is increased, the special design of the piston crown in combination, effective to form a strong intake swirl, there conducive to the formation and atomization of the mixture gas.
Similarly, when the engine enters the high-speed operating conditions using homogeneous mixtures mode, the intake the flap open the intake manifold intake passage, the airflow through the increased cross to get more air, increasing the engine output power.
5. The variable displacement oil pump
In a conventional oil pump work, with increasing engine speed, increasing the oil pressure, the oil pressure mainly through the pressure-limiting valve limiting the pump inside the machine, but this time the oil is still present in a maximum output operation, not only the power consumption of the engine, and the input energy into heat, it accelerates the deterioration of the oil.
EA888 engine with a variable displacement oil pump, is mainly achieved by adjusting the oil pressure of the oil supply amount of the pump gears. How to achieve? Mainly achieved two of the unit’s internal oil pump gear pump by the relative movement. Two non-displacement pump gear (facing), maximum fuel capacity; maximum axial displacement of the two gear pumps (offset), the minimum amount of oil.
6-bis-rotating balance shafts
the EA888 engine with dual balance shafts, on both sides of the lower end of the cylinder block, and a chain driven by the crankshaft. Opposite to its rotation direction of centrifugal force using a centrifugal force generated by exactly two balancing shaft and the crankshaft generated, most of the vibration can be offset, thereby enhancing the dynamic equilibrium state characteristic of the engine, reduce noise.
Mass EA888 same set of direct injection engine, a water-cooled turbocharger, a variable valve timing advanced technology and the like, with lower fuel consumption, emissions and more power output, compared with the EA111 1.4TSI engine, EA888 engine uses a dual balance shafts, ball valve rocker and power generation technologies such as machine start, make the engine run more smoothly, the noise is further reduce.
Principle
3.EA888 engine configuration
the EA888 engine theory