What is the role of a throttle valve in a fuel injected engine?

The throttle valve in a fuel-injected engine plays a crucial role in regulating air intake. It essentially acts as a gate that controls how much air enters the engine's intake manifold. The amount of air that passes through the throttle affects how much fuel is injected into the combustion chamber, as the engine control unit (ECU) adjusts the fuel flow based on the amount of incoming air. This process is vital for optimizing engine performance, fuel efficiency, and emissions.

When the driver presses the accelerator pedal, the throttle valve opens wider, allowing more air to enter. This increase in airflow signals the fuel injectors to add more fuel to maintain the optimal air-fuel mixture for combustion. Conversely, when the throttle is closed, it restricts air intake, leading to a decrease in fuel injection. This dynamic control of air intake is essential for the engine's responsiveness and overall functioning.