public EA111 series engine is VW’s main small-displacement engine, there are 1.2L, 1.4L, 1.6L three kinds of displacement. Volkswagen’s EA111 series engine combines direct injection, turbocharging and other advanced technology, low-emission, high power, low fuel consumption and other performance advantages. Made of cast iron block and aluminum cylinder two categories, but introduced to the country, and in a variety of Volkswagen models equipped with the 1.4L and 1.6-liter engines are aluminum cylinder head, cast iron block.
1.EA111 1.4TSI engine
VW EA111 series of public 1.4TSI engine is in 2005– 2006 with the launch of a displacement of 1.4L twin supercharged, direct injection technology engine. TSI represents Twincharger Fuel Stratified Injection these acronym words, can be understood as a dual plenum + + direct injection stratified combustion by letters mean surface means.
EA111 engine
in the European market using public 1.4TSI twin supercharged engine models have matching golf, Scirocco, EOS, Jetta and Tiguan, etc., maximum engine power up to 125kW / 5500rpm, torque up to 240Nm / 1750-4500, because along with supercharger and turbocharger system, whether at low speed or high speed, the engine supercharging effect can play a very good, so the engine has a torque performance is very 1.4TSI occur.
EA111 engine
considered the world’s strategic plan, the public in 2009 in the country put into mass production 1.4TSI engine. Based on consideration of oil quality and cost control and other factors, the domestic production of 1.4TSI engine supercharger and canceled the stratified combustion, leaving only the turbo and direct injection. The maximum engine power of 96kW (131ps) / 5000rpm, the maximum torque of 220Nm / 1750-3500rpm. Currently equipped with 1.4TSI engine models have six golf, Sagitar, Magotan, Lavida and other models.
EA111 1.4TSI engine
1. The exhaust gas turbocharger
EA111 engine
turbocharger exhaust pipe integrated design. 1.4TSI this engine turbochargers and the exhaust pipe using an integrated design, so that parts can be reduced to some extent the excess size and weight, so that the system is relatively stable and reliable.
EA111 engine
turbo blades and impeller blades are used on the system design of small size (of 41mm and 37mm respectively), such a turbine would reduce the moment of inertia, a turbine driven by the exhaust gas is easier to make high-speed rotation, can effectively relieve turbocharger system low hysteresis phenomenon. The maximum pressure turbo reaches 1.8bar, and GTDi (240PS version) boost pressure just 1.2bar.
EA11Engine 1
Monitoring accurate intake pressure sensor and the valve body. Before and after the turbocharger intercooler system are mounted two sets of sensor (intake pressure sensor and the intake air temperature sensor), for precisely monitoring the states before and after the charge air is cooled, and then adjusting the calculated and analyzed by the ECU turbocharger the opening degree of the valve body, thereby accurately control the intake air amount required.
EA111 engine
Further, the design of the turbocharger pressure control valve performs two, are side turbocharged exhaust bypass valve and an impeller section of an air intake pressure relief valve, controlled by the ECU. Mainly to prevent excessive engine speed, to ensure that the turbine operates at a relatively fixed speed, while preventing excessive pressure and damage to the turbine throttle valve and other components. Therefore, if the exhaust gas pressure exceeds the set value of the pressure means, the valve is opened, the exhaust gas will be discharged excessive bypass the turbine blades.
2. The double-loop cooling system
1.4TSI engine uses two separate cooling systems, rely on a cooling circuit to achieve engine power to itself cooling system (the primary cooling system). Another cooling system is a water pump driven by an electric, primarily for cooling the turbocharger and charge air (sub-cooling). The main flow restrictor, connecting the sub-cooling circulation line, and a common balance tank. 0
EA111 engine
EA111 engine
primary cooling loop system. The main cooling cycle can be divided into two circulation pipe line, a circulation line flows through the cylinder block, the other circulation line flows through the cylinder head. By double thermostat, to achieve the diversion of the coolant. Flowing through the third engine block for cooling the cylinder. Two thirds of the flow through the cylinder head, a combustion chamber for cooling. A thermostat controls the cooling liquid in the cylinder block, the second control thermostat cylinder head coolant.
EA111 engine
using two separate double thermostat cycle, there are two main advantages: First, the rapid heating gasThe cylinder can be reduced internal friction slider crank mechanism; the second is to obtain good cooling of the cylinder head, the combustion chamber temperature is reduced, increasing volumetric efficiency and reduces the likelihood of occurrence of knocking.
sub-cooling system. Motor driven by a cooling system, including the 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. The primary cooling circuit is conveyed by the coolant from the auxiliary pump to the cooler charge air cooler and an exhaust gas turbocharger.
EA111 engine
3. The intake manifold flap
In fact, to meet the cylinder in stratified charge, homogeneous lean combustion gas so many different charge mode, “intake manifold flap” can play an important role. The engine employed in a low speed operating conditions the stratified charge mode, 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 strong intake swirl, and conducive to the formation of the mixed gas atomization “stratified” mode. Likewise, when the engine enters the high-speed operating conditions using homogeneous mixtures mode, the intake manifold intake passage under the flap open, increasing the airflow through the cross section of the intake air to get more, to increase the output power of the engine.
EA111 engine
However, since the domestic engine 1.4TSI canceled “stratified combustion”, the intake manifold flap also It was canceled, while the design of the intake manifold corresponding improvement made, designed as an inclined hump at the outer edge of the inlet valve seat, can be formed into a special swirl within the cylinder, so that fuel mixed with air to give more fully. The “small cross section, the flow rate of increase”, “large cross-section, the flow rate increases,” the effect of the intake air, may be achieved by the throttle valve.
EA111 engine
4 when an intake valve variable timing
EA111 Series 1.4 also applied the TSI engine variable valve timing VVT technology, but applied only to the intake system, i.e., the intake variableValve timing. The system mainly through the electronic control unit ECU, the blade trough regulator, solenoid valve camshaft adjustment element to achieve a continuously variable valve timing.
EA111 engine
5.TSI fuel supply system Fuel supply
GDI engine the system is the most critical part of the direct injection can be achieved. To spray the fuel into the cylinder pressure is very high, it must have sufficient ejection pressure; and in order to ensure direct injection combustion efficiency, fuel injection systems require precise control of the fuel injection, in which injectors design requirements higher.
EA111 engine
1.4TSI engine is equipped with a high pressure fuel system and the low pressure fuel system, fuel pump and fuel box of the high pressure fuel pump according to the actual needs of the engine fuel supply timing of quantitative. After the low-pressure pump to the high pressure fuel pump, in accordance with the engine load, the pressure can be adjusted between 50bar-100bar. Integrated high-pressure pump in fuel pressure regulating valve and a pressure limiting valve, the system can provide overvoltage protection.
EA111 engine
2.EA111 1.6L engine
EA111 1.6L engine characteristics [ 123]
intake method: naturally aspirated
Maximum power: 77kw / 5000rpm
Maximum torque: 155Nm / 3800rpm
Application of models: Sunny, POLO, Skoda Octavia
[123 ] 
1.6L engine with double overhead camshaft 16-valve structure, having a variable intake timing system. It required engine speed, engine timing adjustments dynamically, effectively matching any speed, vehicle speed and road conditions in a variety of Related more linear and more stable power output.