Characterization of the lean misfire limit
Cycle by cycle variations in combustion are investigated as a means to characterize the lean misfire limit of a spark ignited, internal combustion engine. The cyclic variations are represented as parameters of the cylinder pressure versus crankangle curves. The specific parameters investigated are peak pressure, maximum rate of pressure rise, crankangle of maximum pressure, crankangle of maximum rate of rise, indicated mean effective pressure, and area of the pressure curve. The variations are statistically analyzed on a digital computer. Exhaust gas analysis is performed to determine the correlation between the misfire limit and emissions of hydrocarbons, carbon dioxide, carbon monoxide, nitric oxide, and formaldehyde. Imep and area variations are found to be the most promising as an indicator of the lean misfire limit. As the equivalence ratio decreases from stoichiometric, the variations stay constant, until a sharp linear increase is achieved. Correlation with hydrocarbon emissions shows a strong combustion change occurs at this point of rapid variation increase. This point is adopted as the definition of the lean misfire limit.
- OSTI ID:
- 6653175
- Report Number(s):
- CONF-780208-67
- Resource Relation:
- Conference: Society of Automotive Engineers International Automotive Engineering Congress and Exposition, Detroit, MI, USA, Feb 1978; Related Information: SAE Paper 780235
- Country of Publication:
- United States
- Language:
- English
Similar Records
CONTROLLED END GAS AUTO IGNITION WITH EXHAUST GAS RECIRCULATION ON A STOICHIOMETRIC, SPARK IGNITED, NATURAL GAS ENGINE
Selective NOx Recirculation for Stationary Lean-Burn Natural Gas Engines