Topic
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.
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TL;DR: In this article, the experimental results indicate that the FKGR was the highest with the maximum brake torque (MBT) spark timing and it decreases with an increase in the engine speed.
29 citations
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28 Nov 2007TL;DR: In this paper, the spray formation from a centrally mounted multihole injector was studied in a single-cylinder optical directinjection spark-ignition engine under part-load conditions (0.5 bar intake plenum pressure) at 1500 RPM.
Abstract: Levels of liquid fuel impingement on in-cylinder surfaces in direct injection spark ignition engines have typically been higher than those in port-fuel injection engines due to in-cylinder injection and higher injection pressures. The result is typically an increase in the levels of un-burned hydrocarbons and smoke emissions which reduce the potential fuel economy benefits associated with direct injection engines. Although different injection strategies can be used to reduce these effects to some extent, full optimisation of the injection system and combustion process is only possible through improved understanding of spray development that can be obtained from optical engine investigations under realistic operating conditions. To this extent, the spray formation from a centrally mounted multihole injector was studied in a single-cylinder optical directinjection spark-ignition engine under part-load conditions (0.5 bar intake plenum pressure) at 1500 RPM. A highspeed camera and laser illumination were used to obtain Mie-scattering images of the spray development on different in-cylinder planes for a series of consecutive engine cycles. The engine temperature was varied to reflect cold-start (20 °C) and fully warm (90 °C) engine conditions. A multicomponent fuel (commercial gasoline) and a singlecomponent fuel (iso-octane) were both tested and compared to investigate the effects of fuel properties on spray formation and wall impingement. An experimental arrangement was also developed to detect in-cylinder liquid fuel impingement using heat flux sensors installed on the cylinder liner. Two different injection strategies were tested; a typical single-injection strategy in the intake stroke to promote homogeneous mixture formation, as well as a triple-injection strategy around the same timing to assess the viability of using multiple-injection strategies to reduce wall impingement and improve mixture preparation. A sweep of different locations around the cylinder bore revealed the locations of highest fuel impingement levels which did not correspond directly to the nominal spray plume trajectories as a result of spray-flow interactions. These results were analysed in conjunction with the observed effects from the parallel imaging investigation.
29 citations
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14 Jun 2006TL;DR: In this paper, a linear state-space model predictive controller for SI engine air fuel ratio control is presented and demonstrated over a range of engine operation, which is an analytical controller that does not require online optimization.
Abstract: A novel linear state-space model predictive controller for SI engine air fuel ratio control is presented and demonstrated over a range of engine operation. The linear model-based controller is an analytical controller that does not require online optimization. Time-varying delay compensation is adapted based on the measured engine speed. A Kalman filter is used to estimate the model and unmeasured disturbance states.
29 citations
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TL;DR: In this paper, the design geometry of exhaust manifold plays a vital role in smooth combustion and emission reduction of the spark ignition engine, by analysing and comparing the exhaust gas back pr...
Abstract: The design geometry of exhaust manifold plays a vital role in smooth combustion and emission reduction of the spark ignition engine. In this work, by analysing and comparing the exhaust gas back pr...
28 citations
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01 Sep 1987TL;DR: In this article, a high frequency response (300Hz) flame ionization detector has been used to measure the instantaneous level of HC emissions in the exhaust of an SI engine, and the characteristics of the HC signal are observed to be stable and repeatable at mixture strengths around stoichiometry, but at lean mixtures more erratic and complex signals are observed.
Abstract: A high frequency response (300Hz) flame ionization detector has been used to measure the instantaneous level of HC emissions in the exhaust of an SI engine. The characteristics of the HC signal are observed to be stable and repeatable at mixture strengths around stoichiometry, but at lean mixtures more erratic and complex signals are observed. With the addition of information on cyclic work and ionization levels in the exhaust, a detailed insight into lean combustion problems can be obtained.
28 citations