What is it about?

In our study, we explored new ways to make engines cleaner and more efficient. We tested a special engine mode that uses two different fuels to run, kind of like how a car can switch between gas and electric power. This mode helps reduce harmful stuff that engines produce, like nitrogen oxides and soot. We tried using different fuels—like a mix of diesel and gasoline, and another mix with diesel and E85 (which is mostly ethanol). What we found was pretty interesting: When we used E85, it helped the engine make even less nitrogen oxides, but it increased other not-so-good things like unburned fuel. Gasoline mixed with diesel also made a big difference—it cut down soot a lot compared to regular diesel use. We looked at how much fuel the engine used too. With the gasoline mix, it used about the same as normal. But with E85, because it has less energy, the engine needed more of it. Overall, our study shows that these different ways of running engines could help make cars cleaner, but each has its pros and cons. It's like finding the best balance between making engines eco-friendly and keeping them running smoothly!

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Why is it important?

This research investigates a groundbreaking approach to engine performance and emissions reduction by using a dual-mode combustion strategy. What makes this work stand out is its focus on combining two combustion methods—reactivity controlled compression ignition (RCCI) and conventional diesel combustion (CDC)—to cover the entire engine's operating range. The significance lies in its potential to revolutionize how vehicles operate. By utilizing different fuel combinations and switching between RCCI and CDC modes, this study aims to reduce harmful emissions like nitrogen oxides and soot while enhancing fuel efficiency. This is crucial, especially in light of increasing environmental concerns and stringent emissions regulations for vehicles worldwide. Moreover, the research delves into diverse driving cycles representative of global standards, such as those in Europe, the United States, and Japan. This inclusivity in testing various real-world driving scenarios adds practical relevance to the findings, making it applicable to a wide range of vehicles and regulatory frameworks. The insights gained from comparing different fuel combinations—diesel-gasoline and diesel-E85—in terms of emissions, fuel consumption, and performance across various driving cycles are timely and essential. They offer potential pathways for developing cleaner and more efficient engines that can meet both environmental regulations and consumer demands for eco-friendly transportation. This research stands out for its comprehensive exploration of a novel engine combustion strategy, offering insights that could pave the way for more sustainable and efficient vehicle technologies. Its relevance to current global concerns regarding emissions and fuel efficiency could attract a broad readership interested in innovative solutions for cleaner transportation.


Writing this research article was an exhilarating journey fueled by collaboration and innovation. Working alongside dedicated colleagues, we ventured into uncharted territories of engine design and emissions reduction. The depth of our exploration into the dual-mode RCCI/CDC strategy brought about fascinating revelations about the potential of engines to operate cleaner and more efficiently. What made this research truly rewarding was the realization that our findings could contribute significantly to the quest for cleaner transportation worldwide. As we navigated through the complexities of different fuel combinations and their impacts on emissions and performance across diverse driving cycles, it became evident that our work held promise for a more sustainable automotive future. Moreover, this research opened doors to understanding how engines can adapt and perform optimally under varying conditions, mirroring the dynamic nature of real-world driving scenarios. It's not just about creating efficient engines; it's about crafting solutions that resonate with global emissions standards while meeting the needs of consumers. I hope our article sparks curiosity and enthusiasm, even in those who might not typically find engine technology a gripping subject. Because at its core, this work isn't just about engines; it's about making a tangible difference in reducing pollutants that affect our environment and our daily lives. It's about finding that delicate balance between performance and eco-friendliness, paving the way for a cleaner and more sustainable future in transportation.

Dr Javier Monsalve-Serrano
Universitat Politecnica de Valencia

Read the Original

This page is a summary of: Fuel consumption and engine-out emissions estimations of a light-duty engine running in dual-mode RCCI/CDC with different fuels and driving cycles, Energy, August 2018, Elsevier,
DOI: 10.1016/j.energy.2018.05.144.
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