Abstract: This study proposes a dual closed-loop control system based on a 7 L methanol range extender, establishing two operational modes: torque control (TC) mode with engine torquegenerator speed regulation, and speed control (SC) mode with engine speed-generator torque comprehensive characteristics from four dimensions: steady-state speed characteristics, transient speed response, steady-state power output characteristics, and external characteristic curves. The experimental results show that in terms of steady-state control accuracy, the TC mode exhibits superior control precision, with its speed fluctuation rate reduced by up to 46.7% compared to the SC mode. Under transient load conditions, the speed deviation of the TC mode is reduced by 21% to 71% compared to the SC mode, and the adjustment time is shortened by more than 60%. On the other hand, the SC mode demonstrates better stability during continuous power output, with its power fluctuation rate reduced by up to 86.1% compared to the TC mode. Additionally, the comparison of external characteristic curves shows that the maximum power output of the SC mode at various speed points is significantly lower than that of the TC mode, with the power output difference exceeding 30% across the entire speed range. regulation. Through a self-developed range extender test bench platform, the research systematically investigates the performance impacts of different control modes on the range extender's

Key words: methanol range extender; range extender assembly test bench; dual closed-loop control system; experimental testing

摘要： 基于某 7 L 甲醇增程器，提出双闭环控制系统，分别构建基于发动机扭矩-发电机转速 的发动机主导扭矩控制（TC）模式和基于发动机转速-发电机扭矩的发动机主导转速控制（SC） 模式两种协同控制架构。通过自主研发的增程器台架实验平台，从稳态转速特性、瞬态转速 响应、稳态功率输出特性以及外特性曲线四个维度，系统对比了不同控制模式对增程器综合 性能的性能影响。实验结果表明，在稳态控制精度方面，TC 模式表现出更优的控制精度，其 转速波动率较 SC 模式最大降低 46.7%。在瞬态加载工况下，TC 模式转速偏移量较 SC 模式 降幅达 21%～71%，且调节时间缩短 60%以上。而 SC 模式在持续功率输出时表现出更优稳定 性，其功率波动率较 TC 模式最高降低 86.1%。此外，外特性曲线对比显示 SC 模式在各转速 点的最大功率输出显著低于 TC 模式，全转速段功率输出差距均超过 30%。

关键词: 甲醇增程器；增程器总成台架；双闭环控制系统；测试实验