Emission Reduction with an Alternative Diesel Combustion Process

verfasst von: Marvin Sascha Wahl

Verlag: Springer Fachmedien Wiesbaden

Buchreihe : Wissenschaftliche Reihe Fahrzeugtechnik Universität Stuttgart

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Über dieses Buch

Marvin Sascha Wahl presents the possibilities for optimising diesel engine combustion. In the advanced process of partially premixed diesel combustion, nitrogen oxide and soot emissions can be minimised at the same time. A new feature is the possibility of applying this strategy up to 2000 revolutions and 10 bar indicated mean pressure. In this work, various effective parameters are also compared and correlated with each other. A final comparison with conventional diesel combustion shows the advantages and disadvantages and evaluates them.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction and State of Research

Abstract

Retrospect to the year 1892: Rudolf Diesel – starting his career in Paris to develop a machine producing glaze ice – enrolled a patent with the number DRP 67 207 to improve the efficiency of internal combustion engines. This application describes the theory of diffusive combustion in a reciprocal engine. The compression stroke compresses the “pure” air or steam to the maximum cycle pressure.

Marvin Sascha Wahl

Chapter 2. Thermodynamic Basics to Evaluate PCCI Measurements

Abstract

First of all, thermodynamic equations for a (diesel) engine will be discussed. Thereafter, the losses in PCCI-like combustion with respect to LTHR, NTC, and HTHR of the pre-injected fuel are in focus.

Marvin Sascha Wahl

Chapter 3. Single-Cylinder Test Bench and Measurement Equipment

Abstract

The test bench at the IFS (University of Stuttgart) is fully equipped with an external compressor, the possibility of independent conditioning of air, water and oil temperature as well as intake-air, and oil pressure. A cooled high-pressure EGR line with an EGR valve to apportion fresh air and recirculated air is traced back to the intake plenum with the water jacket. Furthermore, the downstream piping is designed to reach an equally premixed mixture of fresh and recirculated air.

Marvin Sascha Wahl

Chapter 4. Test Bench Measurements and Analysis

Abstract

A state-of-the-art direct-injection diesel engine was used for the test setup. The Mercedes Benz OM642 base engine is available in many different configurations. Piston material, piston geometry, connecting rod length, and a varying compression ratio for different configurations and markets should be mentioned as the main variations.

Marvin Sascha Wahl

Chapter 5. Empirical Based Model to Depict Ignition Delays for PCCI

Abstract

The detection of the SOC was determined using the tangent function from the previous project, which Beck published in 2012 [62]. However, instead of the burn rate, the ROHR was therefore used. Furthermore, it was established that for the detection of the LTHR, the zero crossing of the ROHR provides more accurate results. Since, theoretically, no zero crossing has to occur with the calculated burn rate (see Figure 2.4), this was of course not defined in the previous project.

Marvin Sascha Wahl

Chapter 6. Summary and Conclusions

Abstract

At the University of Stuttgart, the single-cylinder engine was investigated in terms of PCCI and conventional diesel application. PCCI was analyzed and evaluated regarding thermodynamic properties as well as raw engine emissions, indicating both advantages and disadvantages of this alternative combustion strategy. These results were used to improve the ongoing test bench measurements and subsequently to fit the three-stage Arrhenius model to predict ID for the start of low and high-temperature combustion.

Marvin Sascha Wahl

Backmatter

Titel: Emission Reduction with an Alternative Diesel Combustion Process
verfasst von: Marvin Sascha Wahl
Verlag: Springer Fachmedien Wiesbaden
Electronic ISBN: 978-3-658-42094-9
Print ISBN: 978-3-658-42093-2
DOI: https://doi.org/10.1007/978-3-658-42094-9

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Über dieses Buch

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction and State of Research

Chapter 2. Thermodynamic Basics to Evaluate PCCI Measurements

Chapter 3. Single-Cylinder Test Bench and Measurement Equipment

Chapter 4. Test Bench Measurements and Analysis

Chapter 5. Empirical Based Model to Depict Ignition Delays for PCCI

Chapter 6. Summary and Conclusions

Backmatter

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