What is the difference between direct injection and multi-point fuel injection?
1 Answers
Multi-point fuel injection electronically controls the injection of fuel into the intake manifold to mix with air, and the engine's intake stroke then draws the air-fuel mixture into the cylinder. Direct injection, on the other hand, moves the fuel injector from the intake manifold to inside the cylinder, so the amount of air-fuel mixture is not affected by the opening and closing of the intake valve but is directly determined by the computer for timing and quantity. The differences between multi-point fuel injection and direct injection are as follows: 1. Fuel quality: Direct injection has higher fuel quality requirements compared to multi-point fuel injection, with a compression ratio as high as 12. 2. Cost: Due to the more complex components of direct injection compared to multi-point fuel injection, the price is usually higher. In other words, for the same car, direct injection technology is more expensive than multi-point fuel injection technology. 3. Fuel consumption: Direct injection has significantly lower fuel consumption compared to multi-point fuel injection. 4. Power performance: Direct injection improves power and torque by 10% compared to a general engine of the same displacement. 5. Technical level: Multi-point fuel injection technology is more mature, while direct injection is a newer and more advanced fuel injection technology. 6. Maintenance: Multi-point fuel injection has a simpler structure, making it better in terms of maintenance, reliability, and upkeep compared to direct injection.
