Spark-ignition engine

About: Spark-ignition engine is a research topic. Over the lifetime, 4352 publications have been published within this topic receiving 66550 citations.

A Study of Combustion of Hydrogen-Enriched Gasoline in a Spark Ignition Engine

Abstract: An investigation has been done on the influence of small amounts of hydrogen added to hydrocarbons-air mixtures on combustion characteristics. The effect of hydrogen addition to a hydrocarbon-air mixture was firstly approached in an experimental bomb, to measure the laminar burning velocity and the shift of lean flammability limit. Experiments carried out with a single-cylinder four stroke SI engine confirmed the possibility of expanding the combustion stability limit, which correlates well with the general trend of enhancing the rate of combustion. An increase of brake thermal efficiency has been obtained with a reduction of HC emissions; the NO{sub x} emissions were higher, except for very lean mixtures.

Fast prediction of start-of-combustion in HCCI with combined artificial neural networks and ignition delay model

Abstract: Homogeneously charged compression ignition (HCCI) engine is a desirable compromise between spark ignition engine and compression ignition engine. Despite the many advantageous features of HCCI combustion, controlling the initiation of combustion remains a challenge for practical applications. A fast and accurate model for the start-of-combustion (SOC) can be useful for developing control strategies of HCCI. In this study, we explore the idea of training artificial neural networks (ANN) for ignition delay and coupling ANN with a semi-empirical model to provide a fast and reliable model for SOC. Through extensive comparisons, this model is found to predict SOC in good agreement with those obtained from a well-mixed reactor model using detailed mechanisms. The CPU time for each run takes about 20–30 ms on a PC. The proposed model is potentially promising for use in real-time dynamic control of HCCI engine combustion.

Conditionally-Sampled Velocity and Turbulence Measurements in a Spark Ignition Engine

Abstract: Laser Doppler velocimeter measurements have been made in a homogeneously-charged spark ignition engine. With ignition at the side wall of the disc-shaped combustion chamber, the fluid motion in the direction of flame propagation was measured at the center of the chamber. A simultaneous ionization probe measurement was used to identify the time of flame arrival at the velocimeter probe volume. Phase-averaged measurements recorded from many engine cycles were conditionally sampled according to flame arrival time. The results presented show an increase in the unburned gas turbulence from compression, and strongly suggest that cyclic variation in burn duration is caused by cyclic variation in the bulk turbulence intensity ahead of the flame.

Direct fuel injection/spark ignition engine control device

Abstract: A control apparatus is configured to achieve considerably delayed ignition timing and combustion stability, and to bring about an increase in exhaust gas temperature and a reduction in HC discharge when the engine is cold. Normal stratified combustion operation and homogeneous combustion operation are carried out when warming has been completed and the coolant temperature of the internal combustion engine has exceeded 80° C. In an injection operation at the top dead center, the injection start timing ITS occurs prior to compression top dead center (TDC) and the injection end timing ITE occurs after compression top dead center (TDC), whereby fuel injection is carried out so as to straddle the compression top dead center. The ignition timing ADV occurs after compression top dead center (TDC) and ignition occurs with a timing that is delayed from the injection start timing ITS.