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Diesel engine urges automobile industry to save energy and reduce emissions
In a recent monthly forum on the "Clean Power Development Roadmap," Yu Zhuoping, Dean of the School of Automotive Engineering at Tongji University, emphasized that diesel technology remains one of the most effective solutions for energy efficiency and emission reduction in China's automotive sector. From an environmental perspective, he pointed out that diesel engines currently offer more mature and efficient technology compared to gasoline engines, which are still in the process of optimization.
One of the key advantages of diesel engines is their low fuel consumption and emissions. Compared to traditional gasoline engines, they can reduce fuel use by approximately 30% and cut carbon dioxide emissions by around 25%. Germany’s experience from 1999 to 2004 demonstrated this benefit, as the widespread adoption of diesel technology saved 90 million tons of fuel and reduced 15 million cubic meters of CO₂ emissions. That amount of fuel saved is equivalent to what 100,000 cars would consume in a year. Since the introduction of common rail technology in the late 1990s, diesel vehicles have made up over 55% of new car sales in Europe.
Yu Zhuoping also highlighted that China’s diesel market has now reached a high level of maturity. He mentioned a pilot project conducted by Shanghai Volkswagen with support from the Ministry of Science and Technology, where 50 diesel taxis were tested using various fuels such as Euro II, Euro III, and synthetic oil. These taxis traveled over 220,000 kilometers without issues, proving that China’s fuel technology is fully capable of supporting diesel engines.
While Japan has made significant progress in hybrid technology, Yu believes that diesel technology may be even more crucial, especially considering its broader applicability in both urban and suburban environments. Unlike hybrids, which are better suited for city driving, diesel engines offer consistent performance across different road conditions. Therefore, he suggests that China should pay more attention to dieselization as a practical and rapid way to achieve energy savings and emission reductions in the short term.
Additionally, diesel engines provide greater power and torque—about 50% higher than gasoline engines—which enhances acceleration performance. They can also run directly on synthetic fuels without requiring engine modifications, making them more flexible and cost-effective.
Looking ahead, Yu Zhuoping noted that diesel engines will continue to play a vital role in reducing emissions, fuel consumption, and operating costs for both the country and consumers. As technology advances, diesel engines are becoming a key trend in the automotive industry.
On the topic of transmission systems, he discussed the growing demand for automatic vehicles in China, where the market share is expected to rise from 20–30% to over 50% in the coming years. While many Chinese drivers currently favor manual transmissions, the shift toward automatics is inevitable.
He also compared different types of automatic transmissions, such as AT, AMT, CVT, and DCT. Among these, DCT (Dual Clutch Transmission) stands out for its superior fuel efficiency and smooth shifting. Unlike AMT, which suffers from poor shift quality, or CVT, which has limitations in high-power applications, DCT offers seamless gear changes and no power interruption. This makes it a more reliable and efficient option for future vehicle development.
Yu concluded that integrating automatic transmission technology into the market could greatly benefit the growth of hybrid systems, as compatibility between traditional and hybrid powertrains is essential for long-term sustainability.