Zhong Guo Zhi Liang Xin Wen Wang·2025-09-26 07:50Core Viewpoint - The shift from 2.0T engines to 1.5T engines in range-extended electric vehicles (REEVs) is driven by the need for efficiency, cost-effectiveness, and the evolving role of the engine as a generator rather than a primary power source [1][5][17] Engine Role in REEVs - In REEVs, the engine functions primarily as a generator to produce electricity, while the electric motor drives the wheels, making the engine's role fundamentally different from traditional vehicles [5][6] - The focus on a strong electric drive system reduces the necessity for a powerful 2.0T engine, as the 1.5T engine can efficiently meet the power requirements for typical driving conditions [3][17] Efficiency and Cost Considerations - The 1.5T engine is favored due to its higher thermal efficiency, with many achieving over 40%, compared to most 2.0T engines which remain below 38% [8][11] - The smaller size and weight of the 1.5T engine allow for better vehicle layout, optimizing space for batteries and electric motors, which enhances overall performance and range [10][11] Market Trends and Consumer Preferences - Major REEV models like Li Auto's L series and Aito's M series predominantly use 1.5T engines, reflecting a strategic choice based on technology, cost, and efficiency [6][11] - As battery technology improves, the reliance on the engine for power generation decreases, further solidifying the 1.5T engine's position as the optimal choice for most consumers [17] Performance and Application - While 2.0T engines can provide higher power output, their advantages are often unnecessary for everyday driving, as demonstrated by the performance metrics of vehicles like the Li L9 [13][15] - The increasing battery capacity in modern REEVs means that the need for a larger engine is diminishing, aligning with consumer demands for lower operating costs and quieter driving experiences [17]