What is a direct injection engine?
2 Answers
Direct injection engine refers to FSI (Fuel Stratified Injection) in-cylinder direct injection engine or direct injection gasoline engine, which optimizes the air-fuel mixture efficiency, resolving the contradiction between high fuel efficiency and high power output. Audi's FSI technology increases the torque and output of spark-ignition engines while improving fuel economy by 15%, laying the foundation for emission reduction. Compared with conventional spark-ignition engines, FSI can directly inject fuel into the combustion chamber, eliminating the need for a throttle valve, reducing engine heat loss, thereby increasing output power and reducing fuel consumption. In-cylinder direct injection is a technology that directly injects fuel into the cylinder to mix with intake air.
I've always found direct injection engines quite fascinating. Essentially, they inject fuel directly into the combustion cylinder for burning, unlike traditional engines that first spray fuel into the intake manifold for mixing before entering the cylinder. This approach offers numerous advantages, such as improving combustion efficiency for better fuel economy and enhanced power output. The principle involves using high-pressure injection systems to precisely spray fuel near the spark plug, allowing more accurate control over the air-fuel mixture and reducing waste. In my automotive research, I've noticed this technology is widely adopted in modern vehicles - Volkswagen's TSI system employs it, and when combined with turbocharging, it further boosts performance. However, there are drawbacks too, like the tendency for fuel injectors to accumulate carbon deposits requiring regular cleaning. Overall, it represents progress in engine development, making driving more eco-friendly and convenient.
