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Combustion Characteristics of a Spray-Guided Direct-Injection Stratified-Charge Engine with a High-Squish Piston
Technical Paper
2005-01-1937
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This work describes an experimental investigation on the stratified combustion and engine-out emissions characteristics of a single-cylinder, spark-ignition, direct-injection, spray-guided engine employing an outward-opening injector, an optimized high-squish, bowled piston, and a variable swirl valve control. Experiments were performed using two different outward-opening injectors with 80° and 90° spray angles, each having a variable injector pintle-lift control allowing different rates of injection. The fuel consumption of the engine was found to improve with decreasing air-swirl motion, increasing spark-plug length, increasing spark energy, and decreasing effective rate of injection, but to be relatively insensitive to fuel-rail pressure in the range of 10-20 MPa. At optimal injection and ignition timings, no misfires were observed in 30,000 consecutive cycles. Multiple pulsing of the injector did not improve upon the single injection-pulse results either by changing the timing of the injection process or by changing the dwell time between injection events.
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Szekely, G. and Alkidas, A., "Combustion Characteristics of a Spray-Guided Direct-Injection Stratified-Charge Engine with a High-Squish Piston," SAE Technical Paper 2005-01-1937, 2005, https://doi.org/10.4271/2005-01-1937.Also In
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