Miniaturized passively Q-switched Nd:YAG/Cr(4+):YAG lasers are promising candidates as spark sources for sophisticated laser ignition. The influence of the complex spatial-temporal pulse profile of such lasers on the process of plasma breakdown and on the energy transfer is studied. The developed measurement technique is applied to an open ignition system as well as to prototypes of laser spark...

Spark-assisted compression ignition (SACI) is a potential way to improve thermal efficiency for gasoline engine with relatively low ratio. The dual-injection system and spark strategy are considered be an effective approach control the combustion of SACI engine. Polyoxymethylene dimethyl ethers (PODE) fuel carbon neutral high oxygen content unique molecule structure. In this study, transition m...

The focus of this study was to experimentally investigate the development of nonlinear cyclic dispersion patterns in spark ignition engines. The results indicated a transition from stochastic behavior to noisy nonlinear determinism as equivalence ratio was decreased to very lean conditions. The transition to nonlinear deterministic behavior appeared to occur via a period-doubling bifurcation se...

Catalytic Decomposition of Biogas (CDB), producing simultaneously syngases (SG), with high hydrogen contents, for spark ignition (SI) engines and bio-carbon nanofibers (BCNFs) to be further used as precursor of synthetic graphite, is presented as an alternative to the usual direct combustion. Synthetic biogas mixtures were decomposed in the presence of a Ni catalyst at different temperatures an...

Dilution of the intake air of the SI engine with the inert gases is one of the emission control techniques like exhaust gas recirculation, water injection into combustion chamber and cyclic variability, without scarifying power output and/or thermal efficiency (TE). This paper investigates the effects of using argon (Ar) gas to mitigate the spark ignition engine intake air to enhance the perfor...

A numerical study was created and developed to evaluate the engine performance, combustion characteristics exhaust gas emissions of a spark-ignition by using gasoline, liquefied petroleum (LPG) ethanol fuels at different cylinder head temperature (150, 200, 250, 300 350 °C) speed 2500 rpm (revolution per mint) constant load. Four-cylinder four-stroke, water cooling system spark ignition used in...

Combustion in homogeneous charge compression ignition (HCCI) engine is controlled auto ignition of well-mixed fuel, air and residual gas. Since onset of HCCI combustion depends on the auto ignition of fuel/air mixture, there is no direct control on the start of combustion process. Therefore, HCCI combustion becomes unstable rather easily especially at lower and higher engine load. Charge strati...

• Novel pre-chamber test rig with dual schlieren setups. Nanosecond repetitively pulsed discharge and inductive ignition systems. Spark on the turbulent jet main chamber. Flame front propagation in affects probability Ignition of very lean conditions is possible by combining NRPD TJI. The optimization combustion process spark engines has led to novel strategies ignite low reactivity mixtures, s...

This paper describes a cost-effective fuzzy control system applied to a small spark-ignition internal-combustion engine to achieve regulation of the fuel injection system. The system determines the amount of fuel required from a fuzzy algorithm that uses the engine speed and manifold air pressure as input values. The parameters of the fuzzy control paradigm were a collection of rules and fuzzy-...

Rise and delay times of mixtures of methane, propane, n-butane, iso-butane and isooctane mixed with air ignited by transient plasma discharge were investigated and compared with spark discharge ignition. Multi-ignition site effect and high electron energy are suggested to contribute to shortening of rise and delay times.