Abstract: To promote methanol-extended-range new-energy commercial vehicles, targeted optimization design is carried out on the fuel supply, intake-exhaust, ignition, lubrication and other systems of the prototype engine based on a 3.0T V6 gasoline engine body and in combination with the physicochemical properties of methanol fuel. Core technologies including the Atkinson cycle, variable-geometry turbocharger (VGT) and 4-valve variable valve timing (4VVT) are integrated to address key problems of methanol engines such as corrosion, wear, cold start difficulty and seal failure. Bench test results show that the optimized 3.0T V6 M100 methanol engine delivers a net power of 230 kW, a net torque of 510 Nm and a minimum specific methanol consumption of 440 g/(kW·h), with its thermal efficiency reaching 42.7%. The model accuracy of both engine external characteristics and universal characteristics meets design criteria. All performance indicators satisfy the power output requirements of extended-range new-energy commercial vehicles, so this engine can serve as a reliable power matching unit for such vehicles. Compared with conventional retrofitted methanol engines, this engine features high power density, compact size and convenient maintenance.

Key words: methanol fuel; methanol engine; structural optimization; bench calibration; specific methanol consumption; extended-range commercial vehicles

摘要： 为推广甲醇增程新能源商用车，依托 3.0T V6 汽油发动机本体，结合甲醇燃料理化特 性，对原型机燃料供给、进排气、点火、润滑等系统开展针对性优化设计，通过集成阿特金 森循环、可变截面增压器（VGT）、四气门可变气门正时（4VVT）等核心技术，解决甲醇发 动机腐蚀、磨损、冷启动及密封失效等关键问题。台架性能试验结果表明，优化后的 3.0T V6 M100 甲醇发动机净功率为 230 kW、净扭矩为 510 Nm、最低比醇耗为 440 g/(kW·h)，热效率 提升至 42.7%。发动机外特性及万有特性模型精度均符合设计标准，各项性能指标可满足增 程式新能源商用车动力输出需求，可作为该车型可靠的动力配套装置。相较于传统甲醇改装 机型，该发动机具备功率密度高、体积紧凑、维护便捷等优势。

关键词: 甲醇燃料；甲醇发动机；结构优化；台架标定；比醇耗；增程式商用车