A Study of Knock and Power Loss in the Automotive Spark Ignition Engine

Franklin, Matthew L.; Murphy, Thomas E.

doi:10.4271/890161

Cited by 15 publications

(6 citation statements)

References 4 publications

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“…During the experiments, audible knock could be clearly noticed when MAPO goes over 0.1 MPa, and the corresponding cycle could be regard as a knocking cycle. Here knock intensity threshold is set as 0.1 MPa, which is also applied for similar sized engines in previous works [35,36]. The knocking occurrence probability for each fuel is shown by individual bar charts.…”

Section: Knocking Tendencymentioning

confidence: 99%

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

et al. 2016

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Section: Knocking Tendencymentioning

confidence: 99%

Experimental investigation on the knocking combustion characteristics of n-butanol gasoline blends in a DISI engine

et al. 2016

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“…Therefore, the knock intensity threshold of the present study was set as 0.1 MPa, which was also applied for similar sized engines in previous studies. 28,29 Using this criterion, percentage of knock cycles out of 200 cycles for each operating condition was calculated. Considering the randomness of knock, the operating condition was regarded as a knock condition when the proportion of knock cycles in the total test cycles was up to 10%.…”

Section: Evaluation Methods For Knock and Performance Parametersmentioning

confidence: 99%

“…Considering the randomness of knock, the operating condition was regarded as a knock condition when the proportion of knock cycles in the total test cycles was up to 10%. 28 The indicated mean effective pressure (IMEP) was calculated from the mean in-cylinder pressure of 200 cycles. The coefficient of variation of IMEP is an index for evaluating the combustion stability, defined as follows 30…”

Section: Evaluation Methods For Knock and Performance Parametersmentioning

confidence: 99%

Influence of injection strategies on knock resistance and combustion characteristics in a DISI engine

Wei

Shao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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The combustion of a direct injection spark ignition engine is significantly affected by the fuel injection strategy due to the impact this strategy has on the gas-mixture formation and the turbulence flow. However, comprehensive assessments on both knock and engine performances for different injection strategies are generally lacking. Therefore, the main objective of the present study is to provide an experimental evidence of how a single injection strategy and a split injection strategy compare in terms of both knock tendency and engine performances like thermal efficiency, torque and combustion stability. Starting from the optimization of a single injection strategy, a split injection strategy is then evaluated. Under the present operating conditions, an optimum secondary injection timing of 100 CAD BTDC is found to have significant improvements on both the knock resistance and the overall engine performances. It should be noted that the present results indicate that the relationship between double injection and anti-knock performance is not monotonous. In addition, the double injection shows superior potential in improving fuel economy and power performance in contrast with the single injection thanks to a more stable combustion when a late injection timing is applied.

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“…Note that the spark advance has to be bounded both from above and from below to prevent the mix from not burning uniformly, thus causing undesired knocking [41], [42] (upper bound) and from misfiring [43], [44] (lower bound), which causes undesired pollutants. These bounds depend on the revolution speed .…”

Section: B the Modelmentioning

confidence: 99%