Showing papers on "Carbureted compression ignition model engine published in 1974"

Combustion Bomb Tests of Laser Ignition

Abstract: Tests of laser ignition are conducted in a combustion bomb. A range of fuels is investigated comprising isooctane, cyclohexane, n-hexane, clear indolene, and No. 1 diesel fuel. The ignition characteristics of laser-induced sparks are compared with sparks generated with a spark plug for different air/fuel ratios. The power density required to produce laser induced sparks is investigated. Although laser ignition appears to be impractical as an ignition device because of its low efficiency and high cost, it presents some interesting possibilities compared to the standard spark plug in that the laser spark is electrodeless and can be positioned anywhere inside the combustion chamber. Its preimary use appears to be as a research tool.

A Study of Ignition System Effects on Power, Emissions, Lean Misfire Limit, and EGR Tolerance of a Single-Cylinder Engine-Multiple Spark versus Conventional Single Spark Ignition

Abstract: The characteristics of multiple spark ignition systems with respect to engine performance, emissions, lean misfire, and tolerance to exhaust gas recirculation (EGR) have been investigated using a carbureted single-cylinder engine. The results, which were compared to those obtained with a standard single spark ignition system, show that both lean misfire limit and EGR tolerance are extended with the multiple spark system. The amount of extension varies with engine load, being largest at the lighter loads studied. Engine power and emissions at non-misfiring conditions are the same with both ignition systems.

Ignition apparatus for internal combustion engine

Abstract: An ignition apparatus for supplying ignition energy of high voltage to the ignition plugs at the optimum ignition timing required of the internal combustion engine is disclosed, in which an electric or electronic adder in a control circuit begins to be energized after a time delay sufficient at least for completion of one ignition starting from the time of generation of at least one rotational angle signal occuring prior to the optimum ignition timing, the accumulating operation continues until the generation of the next rotational angle signal when a subtractor begins subtracting operation, and the next ignition is effected by causing electromagnetic induction in the ignition coils when the result of subtraction reaches a predetermined value. In the process, the length of the delay time, the accumulating and subtracting rate as relative to time and a reference value to be compared with the result of subtraction are maintained constant without regard to the engine rotational speed thereby to change the maximum amplitude at the time of change-over between addition and subtraction in accordance with the engine rotational speed, so that the time required for the result of subtraction to reach the predetermined reference is changed for regulation of ignition timing.

Effect of Diesel Fuel Properties on Emissions and Performance

Abstract: Tests were conducted with several production diesel engines and one prototype low-emission diesel engine to determine the effect of fuel properties on exhaust emissions and engine performance. Fuel cetane number was the most significant fuel property; low cetane fuels resulted in higher hydrocarbons and oxides of nitrogen and increased noise. Conversely, higher cetane fuels produced lower emissions and noise, and also improved engine starting characteristics. The degree of these effects was influenced by engine configuration. Although engine design changes can result in substantial emissions reduction, fuel properties can also influence achievable levels.

Carbureted prechamber rotary combustion engine

Abstract: A rotary combustion engine arrangement having a prechamber rotary engine section in which a rich air-fuel mixture is spark ignited with the hot combustion gases thereof directed into a lean air-fuel mixture for ignition thereof in a main chamber rotary engine section.

Ignition system for an internal combustion engine

Abstract: Ignition system for an internal combustion engine which provides at least two ignition timings which are retarded from normal ignition timing whereby the engine is started with the most retarded ignition timing and the ignition timing is sequentially advanced after the engine start. The invention is particularly effective to decrease air polluting constituent in engine exhaust gas and improve drivability during engine warm up.

Some effects of low ambient air temperature on the performance and exhaust emission of engines

Abstract: The present contribution relates mainly to a discussion of the role of low ambient air temperatures on the performance and exhaust emissions of engines in general and particularly in relation to observations made on two laboratory engines; a spark ignition and a compression ignition diesel engine of the direct injection type. These engines were operated warm but with variable intake temperature conditions down to very low values. /SAE/