What does the term "stoichiometric ratio" refer to in fuel metering?

The stoichiometric ratio is a crucial concept in the context of fuel metering as it describes the ideal ratio of fuel to air necessary for complete combustion. In an ideal combustion scenario, the stoichiometric ratio allows for the efficient burning of fuel, ensuring that all available fuel reacts with the optimal amount of air, thus producing the maximum amount of energy while minimizing unburned fuel and harmful emissions. This ratio is essential for engine performance and efficiency, as it directly influences combustion stability, power output, and emissions control.

When fuel metering systems are designed, they must aim to achieve this stoichiometric ratio to maintain optimum performance under various operating conditions. A deviation from this ratio can lead to issues such as poor engine performance, increased emissions, and potential engine damage due to incomplete combustion or excessive exhaust temperatures. Understanding and implementing the correct stoichiometric ratio is fundamental for technicians and engineers working with fuel systems in automotive and aerospace applications.