With global emission regulations The increasing harsh, multi-cylinder self-suction engine is gradually fade out of our vision, and it is replaced by four-cylinder turbocharger. Among them, 2.0T displacement has a good performance in power, fuel consumption, cost, and operational quality, so it has become more than 200,000 standard configurations of major automotive manufacturers. The model we are familiar with, I want to be the EA888 of the Volkswagen Group, as the most widely used 2.0T engine, down to 200,000 Passat, Porsche, more than 600,000, we can see the figure .
That is to say, it is difficult to think of Toyota, which is representative of German and Japanese, respectively. It has always been, and the impression of Toyota is biased towards the conservative. Even when it is today, the sales model is still inhane, but this does not mean that Toyota is weaker than the public in the Turbo sector, such as equipped. In the 8ar-fts on the Crown of Hanland, IS, and Crown, the technology equipped in it is not less than the mass EA888. So what are the best? Should be compared.
Volkswage EA888
Mixed injection
The EA888 engineered by China is the third generation of products, compared to the second generation of problems, the new will not only solve the problem before the leakage oil, burning oil, timing belt, but also joined the double jet technology. It is also added to the manifold jet on the conventional cylinder direct injection. When the engine is in a high load state, the system will prioritize the oil supply method in the cylinder to ensure a faster power response, and under low load or engine just ignition, it will prioritize the use of manifold injection. Reduce the production of carbon to extend the life of the engine.
Lightweight cylinder design
Integrated exhaust has been seen in many models, this design is in an efficient thermal management system Let the combustion efficiency are fully guaranteed. Because the distance from the exhaust manifold and the engine cooling waterway is very close, after the engine is ignited, the high temperature exhaust gas excluded by the combustion chamber can quickly transfer heat to the coolant, so that the water temperature reaches the optimum operating temperature as soon as possible.
Variable valve timing and lift techniques
Further, variable valve is right and The lift technology can more accurately control the air volume of the cylinder, which controls the oil pressure size to match the optimal valve opening time by increasing the valve timing regulator and the solenoid valve at the front end of the camshaft. Also variable valve lift technology is mounted on the exhaust side, and the valve different opening angle is achieved by two sets of highly different cams. Under the timing and lift, opening and conjunction, the engine operation process can obtain more precise air supply. Toyota 8ar-FTS
Toyota 8ar 2.0T engine did not fall behind the mass EA888, and many mainstream technologies on the market were applied.
The gasoline engine has two cyclic mode, which is the Otto cycle and the Atkinson circulation. The former believes that everyone is very familiar. All gasoline internal combustion engines will be used. The loop is a research and development basis, while the latter can be seen as the “Eco” mode of the former, and the discharging gas capacity is reduced by extending the closure, the exhaust door, thereby reducing the mixed gas capacity in the cylinder, which has reached the purpose of economic fuel economy, but this mode is also A disadvantage, that is, the low twist is very poor, almost unless, so Atkinson’s loop engine does not use it alone. Therefore, Toyota’s THS hybrid system uses the self-suction engine of Atkinson cycles, because there is a motorized help in the starting stage, and the problem of insufficient power is also solved.
On the 8ar engine without power-driven, Toyota chooses to combine two cycles to determine the current speed should be preferred. Under the working conditions starting or loaded, the default is based on Otto cycles, and the range of fuel economics can be quickly flexed, and the Atkinson loop will start working at this time. To achieve the most economical fuel area.
The 8ar engine can effectively reduce the turbine hysteresis problem, and the turbine blade uses a lightweight nickel group. As the material, the alloy is made as soon as possible, and the maximum torque can be built in a lower speed condition, solving the problem of “starting meat” in the vehicle.
Summary
, the two engines have a good bright spot and advantage, even Many technologies have many similar places, all of which are the best in this field, and which one chooses not much problem.