Air-Fuel Ratio Meter monitors the air-fuel ratio of vehicle internal combustion engine. Air-Fuel Ratio Meters also called air-fuel ratio gauges, air-fuel meters, or air-fuel gauges. Air-Fuel Ratio Meter reads the voltage output of an oxygen sensor, sometimes also called lambda sensor, whether it be from a narrow band or wide band oxygen sensor. Air-Fuel Ratio Meter is required to control the vehicle engine by tuning lean air-fuel ratio. Analog Air-Fuel Ratio Meter shows the display with a needle, and Digital Air-Fuel Ratio Meter displays the air-fuel ratio count in LED/LCD display.

Air-Fuel Ratio (AFR)

Air-fuel ratio (AFR) is the mass ratio of air to fuel present during combustion. If exactly enough air is provided to completely burn all of the fuel, the ratio is known as the stoichiometric mixture (often abbreviated to stoich). AFR is an important measure for anti-pollution and performance tuning reasons. Lambda (λ) is an alternative way to represent AFR. Fuel Air ratio (FAR) is commonly used in the gas turbine industry as well as in government studies of internal combustion engine (ICE) and refers to the ratio of fuel to the air, it is 1/AFR.

Benefits of Air-Fuel Ratio Metering

  • Air-fuel ratio metering determines the condition of the oxygen sensor. A malfunctioning oxygen sensor will result in air-fuel ratios which respond more slowly to changing engine conditions. A damaged or defective sensor may lead to increased fuel consumption and increased pollutant emissions as well as decreased power, and throttle response.
  • Air-fuel ratio metering helps reducing emissions. Keeping the air-fuel mixture near the stoichometric ratio of 14.7:1 (for gasoline engines) allows the catalytic converter to operate at maximum efficiency.
  • Air-fuel ratio metering helps to increase Fuel economy. An air-fuel mixture leaner than the stoichiometric ratio will result in near optimum fuel mileage, costing less per mile traveled and producing the least amount of CO2 emissions.
  • Air-fuel ratio metering improves Engine performance. Carefully mapping out air-fuel ratios throughout the range of rpm and manifold pressure will maximize power output in addition to reducing the risk of detonation.