Interpretation of Buick LaCrosse's Eighth Generation Ecotec Engine Configuration

Since this year, the automobile market has been in a tepid state. Many brands have no choice but to lower the threshold price and increase discounts to attract customers' attention. Even the LaCrosse reinstalled the 1.5T engine on the 202 1 model in order to lower the threshold, but friends who love sports are still interested in the eighth generation Ecotec. 2.0T engines are more interested. Today we will talk about this "extraordinary" 2.0T variable cylinder engine.

Since the introduction of the most stringent national six emission standards in history, many brands have given up emissions above 2.0. Judging from the actual performance, many "upgraded" national six models can only meet the emission standards, but there has been a big "retrogression" in power, which has attracted many complaints.

LaCrosse is Buick's flagship car, which is very important to the brand. At the time of the national sixth emission standard, GM brought a brand-new eighth-generation Ecotecc engine and took the lead in carrying it on Buick LaCrosse. Then this engine not only meets the most stringent national six emission standards in the world from the source, but also brings more surprises to friends who love sports.

First of all, from the data point of view, the maximum power of the 2.0T engine is 237 HP, the maximum torque is 350Nm, and the comprehensive fuel consumption per 100 kilometers is only 6.9L, which is 8% lower than that of the previous generation engine. Let's take a closer look at the "black technology" of this engine.

First, Tripower variable valve management technology

The eighth generation Ecotec engine is equipped with a three-stage sliding camshaft for the first time. With the cooperation of actuator, position sensor, fuel injection system and electronic unit, Tripower variable valve management technology realizes multi-stage cylinder change under intelligent control. Simply put, it is the fast switching between two-cylinder super-economy mode and four-cylinder high-performance mode. According to the actual driving demand, smooth switching can greatly improve fuel economy. According to official data, fuel economy has improved by 65,438+05%.

Second, high-pressure fuel injection and nozzle side arrangement

It sounds as if you can't have your cake and eat it at the same time. The eighth generation Ecotec engine meets the higher pressure requirements of the fuel system by increasing the wall thickness of the fuel rail, upgrading the high-pressure tubing material and high-pressure pump, and adopts the layout of 35Mpa high-pressure direct injection and side injection. Compared with the injection pressure of 20Mpa of the traditional turbocharged engine, the fuel atomization performance is better, and the mixture formed by side injection greatly improves the combustion efficiency and greatly reduces the tiny emission particles.

Third, intelligent active electronic control carbon canister pump

Under the condition of high temperature and high pressure, part of the fuel entering the cylinder will escape in the form of steam. The eighth generation Ecotec adopts intelligent active electronic control carbon canister pump, so that fuel vapor can be desorbed actively, and the carbon canister can be flushed in real time, and the fuel vapor can enter the air intake system for re-combustion by using the steam pressure difference.

Under the blessing of the above-mentioned "black technology", all models of LaCrosse took the lead in meeting the national six emission standards, surpassing most models of the same class in power performance and maintaining a high level.

This article comes from car home, the author of the car manufacturer, and does not represent car home's position.