How is lambda exhaust calculated?
At the Stoichiometric point, Lambda = 1.000. A Lambda value of 1.050 is 5.0% lean, and a Lambda value of 0.950 is 5.0% rich. Once Lambda is calculated, A/F Ratio can be easily determined by simply multiplying Lambda times the Stoichiometric A/F ratio for the fuel used – e.g. 14.71 for petrol – gasoline.
How do you find the lambda of a car?
These lean (higher) and rich (lower) values are calculated for the Lambda scale by dividing the observed A/F ratio with that particular fuel’s stoich. For example: a 12.8:1 observed reading with gasoline is divided by 14.7 to produce a 0.87 Lambda reading.
How is lambda calculated O2?
lambda = 21/(21-O2measured). In this equation, O2measured is the dry measured O2 concentration in the flue gas in vol.
How do you convert lambda to AFR?
As a quick reference, here are lambda values and their AFR equivalents for different fuels. This is handy to use when looking at a wideband display/gauge that displays a gas scale AFR or just for curiosity’s sake.
What is a good lambda value?
1.00
Lambda, which is a Greek letter demonstrated by the symbol λ, represents all fuel’s stoichiometric value as 1.00. Lean conditions would represent a value higher than 1.00, and rich conditions are lower.
What is lambda fuel ratio?
The air-fuel ratio, or lambda number (λ) determines the mass ratio of air and fuel in the combustion chamber, as it relates to the stoichiometric air-fuel ratio. The lambda number represents the setpoint control value for both exhaust recirculation and catalytic exhaust gas scrubbing.
What is a lean lambda reading?
The lambda calculation determines the ratio between the amount of oxygen actually present in a combustion chamber vs. the amount that should have been present to obtain perfect combustion. If the mixture contains too much oxygen for the amount of fuel (a lean mixture), lambda will be greater than 1.00.
What is automotive lambda?
In other words, lambda is the ratio between the amount of oxygen actually present in a combustion chamber versus the amount that should have been present to get perfect combustion. In an ideal mixture, there’s exactly the amount of oxygen required to burn the amount of fuel present.
What is a lambda value?
The heat conductivity of a material is known as its lambda value. The Greek letter λ, lambda, [W/mK] is used to represent the heat conductivity of a material. The heat conductivity of a material is thus popularly known as its lambda value.
What is exhaust lambda?
In simple terms, a lambda sensor measures the amount of oxygen in your exhaust fumes, to ensure your engine is burning fuel correctly.
What does high lambda reading mean?
The lambda reading on a gas tester is, to repeat, an indication of the air to fuel ratio, too high a lambda reading relates to too much oxygen. Too low a reading relates to too much fuel. If the voltage is higher than this, i.e. 0.8 – 1.2 volts then there will be a rich running or excess fuel fault.