Assessment of Different Included Spray Cone Angles and Injection Strategies for PCCI Diesel Engine Combustion

Korkmaz, Metin; Zweigel, René; Niemietz, Kai; Jochim, Bernhard; Abel, Dirk; Pitsch, Heinz

doi:10.4271/2017-01-0717

Cited by 9 publications

(9 citation statements)

References 22 publications

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“…Significantly increased BSCO and BSTHC emissions were observed for the double injection due to wall-wetting and over-leaning of the mixture. 9,13,[27][28][29][30] For the detailed results of the doubleinjection strategy, the reader is referred to the study by Korkmaz et al 24 These results have shown that the application of a split injection is feasible and has lead to remarkable reduction in BSNO x and noise emissions at the same time but can lead to high emissions of BSCO and BSTHC. Due to insufficient performance, the double-injection strategy is not taken into account for further investigation as well as comparison.…”

Section: Resultsmentioning

confidence: 99%

“…The gap between the double-injection strategy and the baseline is about 2.5%, which is explained by spray-wall interaction and over-leaning effects, and underlines the insufficient performance of this strategy. For more details, the reader is referred to the study by Korkmaz et al 24…”

Section: Resultsmentioning

confidence: 99%

“…Schematic test bench layout. 24 was used for the development of the injection strategy as well as for the development of the combustion controller, and LP 1 was used for validation purposes. The injection strategy was extended after the experiments for the baseline were carried out.…”

Section: Experimental Approachmentioning

confidence: 99%

“…Load points investigated in this study. 24 MPC, the non-linear equation 1has to be linearized. To overcome the insufficient quality of a single linearized model, if used for the whole engine operating space, the model linearization is conducted in each control step.…”

Section: Model-based Combustion Controlmentioning

confidence: 99%

“…Combustion efficiency and BSNO x emissions for different injection approaches. 24 combustion for the triple injection starts before TDC and the combustion duration (CA90-CA10) (CD) is approximately 20°CA longer. In terms of emissions, the modified injection strategy has less BSTHC, BSCO, and CSL emissions, but an increase in the soot emissions is observed.…”

Section: Egr Sweep For Steady-state Operationmentioning

confidence: 99%

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Triple-injection strategy for model-based control of premixed charge compression ignition diesel engine combustion

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Low-temperature combustion concepts are of great interest due to their potential to reduce nitrogen oxides (NO x) and soot simultaneously. However, low-temperature combustion often leads to an increase in total unburnt hydrocarbons and carbon monoxide. Furthermore, combustion sound level becomes a challenge, especially at higher loads. Various studies show that these drawbacks can be compensated by advanced injection strategies, for example, split injections. In this study, a significantly modified triple-injection approach is proposed. First, the corresponding impact on engine performance is evaluated at stationary conditions, and second, its observed advantages are evaluated at transient operation. Stationary results show that NO x , soot, and combustion sound level are simultaneously reduced without losses in fuel efficiency and without any remarkable rise in total unburnt hydrocarbon as well as carbon monoxide emissions, satisfying Euro 6 emission regulations. Under transient conditions, model-based predictive control of the engine, which allows for reliable steady-state measurements and permits validation tests at transient operating points, is successfully demonstrated for single and triple injection. With both injection strategies, control of indicated mean effective pressure, combustion phasing (CA50 (crank angle (CA) when 50% fuel is consumed)), and NO x emissions is achieved. As a result of this work, the identified optimal triple-injection strategy leads to lower total unburnt hydrocarbon emissions and to significantly reduced combustion sound level at the same level for NO x emissions in comparison with the single-injection approach. Thus, the proposed triple-injection strategy combined with sophisticated model-based control is a promising concept for future engine emission control.

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