In 2007, global oil consumption reached 3.6 billion tons. According to data published by the American journal *Oil and Gas Journal* on December 24, 2007, the world's proven crude oil reserves could still last for another 51 years, meaning that oil resources might be completely exhausted by 2058 if no significant changes occur. This alarming projection has prompted many countries to rethink their energy policies. Faced with the approaching "post-oil era," major developed nations have begun to implement comprehensive energy strategies. For instance, Japan unveiled its *Energy Strategy for 2030* in June 2006, covering all aspects of the country’s energy sector. The plan aimed to cut Japan’s reliance on oil from 80% to 40%, positioning the nation as a global leader in energy efficiency. It also emphasized advancing power battery technology to a strategic level, ensuring long-term leadership in future energy solutions. Looking at China, the situation is even more urgent. While the country is experiencing rapid economic growth, its energy shortage is becoming increasingly severe. How can China secure its energy future? Professor Yang Fuyuan, a member of the State Key Laboratory of Automobile Safety and Energy at Tsinghua University, offers an insightful perspective. He suggests that the integration of traditional and new energy technologies—specifically, the electrification of control systems and power units—will be the key to addressing both energy and environmental challenges. Hybrid engines, he argues, will play a central role in the next decade. "Although Homogeneous Charge Compression Ignition (HCCI) technology can achieve ultra-low emissions of nitrogen oxides and particulate matter under certain conditions, it struggles in high-speed and high-load environments," said Professor Yang. "Moreover, fuel economy improvements remain limited. Even with hybrid technology alone, vehicle efficiency has improved significantly, but the emission problem of internal combustion engines persists. Combining HCCI with hybrid systems still leaves unresolved issues regarding multi-energy use during the transition period." To address these challenges, Professor Yang proposes developing a hybrid engine that integrates the best features of various technologies. His concept includes an ISG (Integrated Starter Generator) engine equipped with an intelligent control unit and an energy storage system. This engine supports multiple fuels, including synthetic liquid oil (GTL), which is made from diesel, gasoline, natural gas, coal, and biomass. GTL has zero sulfur content and a higher cetane number (75–80) compared to regular diesel (40–50), making it a cleaner and more efficient alternative. Furthermore, the hybrid engine incorporates advanced feedback control mechanisms. By using real-time signals such as cylinder pressure, ion current, knock detection, and optical sensing, the system can adjust combustion dynamically. This closed-loop control helps balance combustion across cylinders, reduce transient emissions, and enable self-adaptive combustion, leading to better performance and lower pollution. Through the combination of hybrid combustion, hybrid power, and combustion state feedback control, the engine achieves ultra-low emissions and superior fuel efficiency. Based on this, Professor Yang believes that hybrid engines capable of adapting to various fuels are a more practical and realistic choice for internal combustion engine manufacturers in the coming years.

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