SAE technical papers on CD-ROM/SAE technical paper series · 1976 · 12 citations · 2 references
EngineeringAutomotive EngineeringMechanical EngineeringCombustionPowertrain EngineeringPropulsionEngine Control SystemsEngine EmissionsEngine ModelingEngine SystemsIgnitionSpark-ignition EnginesAutomotive Emission ControlEmission Control StrategiesIgnition SystemsSpark IgnitionSpark Ignition CombustionSpark Ignition System DesignSpark-ignition Engine Emission ControlSpark-ignition Engine Emissions
<div class="htmlview paragraph">Theoretically, the combustion of homogeneous, lean air-fuel mixtures offers potentially low emissions with low fuel consumption. An experimental investigation of a lean-combustion engine system, equipped with a lean thermal reactor, was conducted with a 1130 kg (2500 lb) vehicle. The effects of spark timing on vehicle emissions, fuel consumption, and lean reactor performance were determined.</div> <div class="htmlview paragraph">Retarded spark timing decreased HC and CO emissions, did not affect NO<sub>x</sub> emissions, and increased fuel consumption. Over-advanced spark timing decreased CO emissions, increased HC and NO<sub>x</sub> emissions, and increased fuel consumption.</div> <div class="htmlview paragraph">The vehicle emission levels were very sensitive to spark timing changes and carburetor calibration repeatability. Thus, implementation of such a vehicle would require careful control of these engine variables.</div>
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