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

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