en:lambda
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| - | ==== Lambda (λ) ==== | + | ===== Lambda (λ) ===== |
| **Lambda (λ)** represents the //air-fuel ratio// in combustion engines relative to the stoichiometric ideal. Calculated as \( \lambda = \frac{\text{Actual Air-Fuel Ratio}}{\text{Stoichiometric Ratio}} \), this dimensionless value is critical for engine management and emissions control. | **Lambda (λ)** represents the //air-fuel ratio// in combustion engines relative to the stoichiometric ideal. Calculated as \( \lambda = \frac{\text{Actual Air-Fuel Ratio}}{\text{Stoichiometric Ratio}} \), this dimensionless value is critical for engine management and emissions control. | ||
| === Stoichiometric Principle === | === Stoichiometric Principle === | ||
| - | The optimal λ value is **1.0** (14.7:1 air-fuel mass ratio for gasoline), where all fuel completely burns with available oxygen. This balance maximizes catalytic converter efficiency while minimizing emissions. | + | The optimal λ value is **1.0** (14.7:1 air-fuel mass ratio for gasoline), where all fuel completely burns with available oxygen. This balance maximizes catalytic converter |
| === Petrol vs. Diesel Optimization === | === Petrol vs. Diesel Optimization === | ||
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| === Measurement & Control === | === Measurement & Control === | ||
| - | Modern engines use **wideband oxygen sensors** for real-time λ monitoring. | + | Modern engines use **wideband oxygen sensors** for real-time λ monitoring. |
| * Engine temperature | * Engine temperature | ||
| * Load demands | * Load demands | ||
| * Emissions requirements | * Emissions requirements | ||
| * Aftertreatment status | * Aftertreatment status | ||
| - | |||
| - | {{ : | ||
| === Application Examples === | === Application Examples === | ||
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| * **Hybrid engines**: λ>1.0 during electric-assist phases | * **Hybrid engines**: λ>1.0 during electric-assist phases | ||
| - | '' | + | '' |
en/lambda.1749804657.txt.gz · Last modified: 2025/06/13 10:50 by obd_diagnose
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