Fuel injection engine

Fuel injected engine thats what you hears when you go to buy a modern vehicle. But what exactly is fuel injection and how is it different from the carburetor?That is what we are going to discuss in this article.

The function of a carburetor is to provide air fuel mixture in the correct proportion to the engine. It uses the pressure difference generated in the engine to pull air and fuel in. It is fully mechanical and has no intelligence ie the intelligence is provided by the driver itself.

In the case of fuel injected engines the case is different , it can be said that the fuel supply has some intelligence .The fuel supply to the cylinders are different at different condition. It senses from different sensors placed in different parts of the vehicle and alter the fuel and air flow accordingly. Modern electronic fuel-injection systems meter fuel very accurately, and use closed loop fuel-injection quantity-control based on a variety of feedback signals from an oxygen sensor, a mass airflow (MAF) or manifold absolute pressure (MAP) sensor, a throttle position (TPS), and at least one sensor on the crankshaft and/or camshaft(s) to monitor the engine’s rotational position. . Oxygen sensors monitor the amount of oxygen in the exhaust, and the engine control unit (ECU) uses this information to adjust the air-to-fuel ratio in real-time.

They have better throttle response, better cold starting ,smoother ride, larger time interval between servicing and correct fuel distribution between the cylinders. In a multicylinder vehicle FI ensures that every cylinder get the same amount of fuel , in the carburetor engine the first cylinders will get more fuel and last will be under fueled this leads to lesser efficiency and wear and tear of the engine. The fuel injector is a electronically controlled valve which is supplied by the fuel pump of your vehicle. When the injector is energized, an electromagnet moves a plunger that opens the valve, allowing the pressurized fuel to fall out through a tiny nozzle. The nozzle is designed to atomize the fuel so that it can burn easily. The injectors are mounted in the intake manifold to spray fuel directly at the intake valves. The fuel rail supplies pressurized fuel to all of the injectors. The fuel injected engines are a little more costly than the carburetor engine but the performance and the efficiency is high. The only problem I see with the fuel injected engines is that ,if the battery is down we cannot push the vehicle and start the vehicle because it will damage the sensors.