spark advance


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  • noun

Synonyms for spark advance

the timing of ignition relative to the position of the piston in an internal-combustion engine

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References in periodicals archive ?
The goal of this work is to resume and demonstrate the possibilities for closed-loop control of the ionization current signal both in knock-free and knock-limited conditions, by proposing a simple and effective control strategy which is able to satisfy the seeking of the MBT spark advance, while keeping the knock intensity at or under the desired level.
The overall test matrix is illustrated in Table 2; the spark advance at the reference gasoline cases (W/G=0) was relative to the most advanced one without knock, whereas a sweep was carried out for W/G=0.2.
The three distributions of the three cylinders (assumed to be normal distributions), or the mean distribution (as they are very similar) estimated by considering only non-pre-ignited cycles, can characterize "standard" combustion at this operating point for the given Spark Advance angle.
A prototype driver, managed by a software tool developed within LabView[TM] environment, is in this case employed to directly control spark advance and timing / duration of fuel and water injections.
The magnitude of the spark advance required to reach MBT increases as engine rpm increases.
As the mass of water increases, combustion should shift towards the exhaust stroke for the same spark advance, because of lower in-cylinder temperatures.
The K values appear to correlate with the spark advance strategy employed by the respective EMS indicating the octane responsiveness of the engines.
Pressure traces referring to more than 1000 engine cycles have been recorded for each engine operating point, for several different Spark Advance values.
For each spark sweep the fuel and air flows were held constant after achieving the nominal 925 kPa NMEP load at 10[degrees] BTDC spark advance. Absolute fueling rates were unique to each blend because of energy and gravimetric density differences.
This factor describes the amplification of the rate of knocking cycles when SA is increased from the knock-limited condition (KLSA, Knock Limited Spark Advance).
Knock integral versus spark advance curves present subset of fuels are shown in Figure 5, and NMEP versus spark advance results are shown in Figure 6.
PFI injection timing was set to firing TDC in order to provide the maximum time for ethanol vaporization and mixing with air Spark sweeps with 2 CAD increment were run at each operating point in order to find the minimum spark advance for the best torque (MBT).
This suggests that a combination of ethanol and GTL naphtha could potentially result in a higher LFS than a comparable gasoline oxygenate blend which, at a given spark advance, could result in improved performance in a spark ignition engine.
Currently, engine manufacturers have focused on engine downsizing to improve combustion efficiency with the introduction of turbocharger or higher compression ratio engines that have the drawback to run the engine at delayed spark advance or richer mixture due to the knock occurrence.
Retarding Spark Advance (SA) decreases efficiency while leading to increased Exhaust Gas Temperature (EGT) which can bring with it a plethora of durability concerns.