A brief analysis of the core technologies of Volkswagen imported car engines

The core technology of automobiles has been continuously improved with the changes of the times and the development of science and technology. Among them, the evolution of internal combustion engine technology has made vehicles with lower fuel consumption and stronger power. Therefore, Volkswagen engineers continue to innovate and improve vehicle performance by adopting a series of advanced engine technologies such as integrated exhaust manifolds and dual injection systems. These bring more benefits and convenience to consumers.

According to the law of conservation of energy, energy can neither be created nor destroyed, but energy forms can be converted into each other. The working principle of the engine is to convert the heat energy of fuel combustion into mechanical energy that propels the vehicle forward. However, there will always be energy loss in the process of conversion between these two energies. Therefore, how to improve the energy conversion rate is a key in the field of engine research and development.

Volkswagen imported car Weilan station wagon equipped with the third-generation EA888 platform 2.0 TSI engine

To this end, Volkswagen engineers have improved the performance of the engine by improving the process of engine intake-fuel injection-exhaust-turbocharging one by one and have made great progress. At present, the engines of Volkswagen imported car models on sale cover 1.2 TSI, 1.4 TSI to 2.0 TSI, 3.0 TSI and other displacements, meeting the needs of most consumers. Among them, the 1.4 TSI and 2.0 TSI engines used in the Veloster, New Sharan and Beetle models are the most representative.

Dual fuel injection system to make the most of every drop of fuel

In order to improve the combustion efficiency of the engine, the amount of fuel injected into the combustion chamber is an important factor. Dual fuel injection technology has also come into being. The 1.4 TSI engine from the new EA211 platform and the 2.0 TSI engine from the third-generation EA888 platform introduced by Volkswagen imported cars all use a combination of direct injection and manifold injection technology. According to different engine working conditions, appropriate injection modes are adopted to complement each other. The use of a "high-low matching" fuel injection combination can effectively reduce fuel consumption in a partial load range, improve combustion efficiency, make full use of every drop of fuel, and effectively reduce carbon deposits.

Volkswagen's latest EA211 platform 1.4 TSI engine

Integrated exhaust manifold to improve thermal efficiency

After the combustion process, the exhaust gas in the engine combustion chamber can easily reach 600 degrees Celsius and be transported to the next mechanism through the exhaust manifold. In order to make full use of this part of heat energy, engineers cleverly "hid" the exhaust manifold in the cylinder head of the 1.4 TSI and 2.0 TSI engines. In this way, the residual heat of the exhaust gas can be used to make the engine warm up faster, especially when using the car air conditioner in winter, the warm air has high thermal efficiency and the oxygen sensor reaches the operating temperature faster, which is more environmentally friendly. At the same time, the integrated exhaust manifold also helps to improve the turbine utilization rate of the turbocharged engine and reduce the problem of poor acceleration of small-displacement turbocharged engines in the low-speed range. The engine structure is more compact, but it can have a "small wins big" power output.

A symbol of powerful power. New turbocharging technology

"Turbo" seems to have long been synonymous with strong power in the hearts of car fans. In order to make it "worthy of its name", Volkswagen engineers have also racked their brains to continuously improve and optimize it. The dual-flow channel technology and the electronically controlled pressure relief valve device are used in the design of the turbocharger. As the name suggests, the dual-flow channel divides the exhaust gas channel entering the turbine into two, just like dividing an unmarked road into two lanes with a white dotted line, so that vehicles can drive on the lane, thereby improving driving efficiency. The dual-flow inlet design makes exhaust smoother and effectively reduces turbo hysteresis. The electronically controlled pressure relief valve is similar to a traffic light that controls traffic flow, which can achieve fast and accurate boost pressure control, allowing the engine to achieve low-speed high-torque performance.

Adjust breathing rhythm, variable intake and exhaust timing, variable exhaust lift

In the process of converting heat energy into mechanical energy, the combustion process is essential, and the degree of integration of gasoline and oxygen in the air also determines the combustion efficiency of the fuel, thereby affecting the conversion efficiency of heat energy. The efficient and "intelligent" valve timing technology of the 2.0 TSI engine from the third-generation EA888 platform enables the variable timing of intake and exhaust and variable lift technology of exhaust to adjust the "breathing method" of the engine in real time, and timely change the engine intake and exhaust time and intake and exhaust volume according to the engine under different working conditions or the depth of the accelerator pedal. It is equivalent to people adjusting their breathing with the change of stride and step frequency when running. Therefore, this technology optimizes the gas exchange process of the engine, significantly improves the response efficiency of the engine, reduces fuel consumption, and enables the engine to have more abundant torque at lower speeds and maintain higher power at high speeds, thereby improving the acceleration performance of the vehicle.

As the "heart" of a car, engine technology will continue to develop in the direction of high efficiency, energy saving, environmental protection and miniaturization. Volkswagen imported cars have also brought these engines with "hidden" innovative designs to Chinese consumers, which not only significantly improves the competitiveness of the models among products of the same level, but also meets more stringent emission regulations and the car needs expected by current consumers.