On December 11, the Science and Technology Development Department of Dongfeng Company organized an appraisal meeting at the Dongfeng Engine Factory to evaluate two key projects: "EQ491i Country 3 Engine Development and Application" and "EQ491i Engine Reduced Oil Consumption Research and Application." Both projects successfully passed the scientific and technological achievement appraisal, marking a significant milestone in the company's ongoing efforts to enhance engine performance and environmental compliance.
The appraisal committee carefully reviewed technical summaries, user reports, and supporting documentation, while also visiting the prototype and application sites. They confirmed that the technical data provided by the research teams was comprehensive, clear, and accurate, fully meeting the standards required for the evaluation. The committee expressed strong confidence in the quality and reliability of the work presented.
In addition, the research team conducted extensive analysis and experiments to meet national emission regulations and address user demands. Through these efforts, they developed practical solutions, overcame technical challenges, and achieved tangible economic and social benefits. All aspects of the projects are considered to be at the forefront of industry standards.
It is worth noting that the newly developed EQ491i engine, which complies with China's National III emission standards, has completed three rounds of trial installations. Each batch met the design specifications and received positive feedback from users. This success underscores Dongfeng Company's commitment to innovation, sustainability, and customer satisfaction in the automotive industry.
The role of the valve is specifically responsible for the input of air into the engine and exhaust the exhaust gas after combustion. From the engine structure, it is divided into Intake Valve and exhaust valve.
The role of the intake valve is to draw air into the engine and mix it with the fuel to burn; The function of the exhaust valve is to discharge the exhaust gas after combustion and dissipate heat.
The valve is composed of a valve head and a rod. The valve head temperature is very high (intake valve 570~670K, exhaust valve 1050~1200K), but also withstand the pressure of the gas, the valve spring force and the transmission component inertia force, its lubrication, cooling conditions are poor, requiring the valve must have a certain strength, stiffness, heat and wear resistance.
The intake valve is generally made of alloy steel (chromium steel, nickel-chromium steel), and the exhaust valve is made of heat-resistant alloy (silicon chromium steel).
Sometimes in order to save heat resistant alloy, the exhaust valve head is made of heat resistant alloy, and the rod is made of chromium steel, and then the two are welded together.
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