What is the function of a fuel injector?
2 Answers
The function of a fuel injector is to spray fuel into the intake manifold or cylinder according to the injection timing and pulse width calculated by the engine ECU. The fuel injector is essentially an electromagnetic valve, and the ECU controls its operation by regulating the current flow through the electromagnetic valve coil. The fuel injector is a critical component for maintaining engine operation, consisting of the injector body, nozzle, support, spring, etc. High-pressure fuel is pumped into the fuel injector through the fuel inlet, generating high pressure within the injector body that acts on the conical surface of the nozzle. When the fuel pressure exceeds the set value, the nozzle valve opens, and high-pressure fuel is sprayed out through the small holes in the nozzle in a mist form into the engine cylinder for combustion, driving the piston to reciprocate.
The fuel injector plays a central role in a car engine, primarily ensuring that fuel is precisely sprayed into the cylinders or intake manifold, forming a mist that mixes with air to facilitate combustion and generate power. If the fuel injection is inaccurate, the engine may shake like a muscle spasm, fuel consumption may skyrocket, and acceleration may become sluggish. I've repaired many cars, and common issues include clogged nozzles or solenoid valve failures, leading to uneven fuel mixing. Routine maintenance is simple: avoid using low-quality fuel and clean the fuel injector every 20,000 kilometers. The fuel injector is controlled by the vehicle's onboard computer, dynamically adjusting the fuel quantity based on throttle depth and engine load, which improves fuel efficiency, reduces emissions, and ensures smoother and more reliable driving. Paying attention to these small details in daily use can extend the car's lifespan and avoid unnecessary expenses on repairs.
