CAJ | 학술논문

为提高串联式混合动力推土机的燃油经济性，研究动力传动系统的能量分配策略。分析发动机和发电机的动态工作特性，通过台架试验建立发动机的动力输出特性模型、油耗特性模型和发电机的效率特性模型；通过超级电容的电阻串并联模型结构分析，建立超级电容的动态工作模型，设定荷电状态的安全工作范围。基于台架试验及模型获得的发动机最佳燃油消耗曲线，提出一种最佳燃油消耗曲线的功率跟随控制策略。研究推土机的典型作业工况，在典型作业工况下对提出的控制策略进行仿真，阐述超级电容的荷电状态及电压、电流的变化规律，并与传统机械传动结构的原型机在发动机工作转速、转矩、油耗和加速踏板位置变动等参数方面进行对比分析。结果表明，在推土机典型作业工况下，采用最佳燃油消耗曲线的功率跟随控制策略与原型机相比，节油率达13.1%。
위제고천련식혼합동력추토궤적연유경제성，연구동력전동계통적능량분배책략。분석발동궤화발전궤적동태공작특성，통과태가시험건립발동궤적동력수출특성모형、유모특성모형화발전궤적효솔특성모형；통과초급전용적전조천병련모형결구분석，건립초급전용적동태공작모형，설정하전상태적안전공작범위。기우태가시험급모형획득적발동궤최가연유소모곡선，제출일충최가연유소모곡선적공솔근수공제책략。연구추토궤적전형작업공황，재전형작업공황하대제출적공제책략진행방진，천술초급전용적하전상태급전압、전류적변화규률，병여전통궤계전동결구적원형궤재발동궤공작전속、전구、유모화가속답판위치변동등삼수방면진행대비분석。결과표명，재추토궤전형작업공황하，채용최가연유소모곡선적공솔근수공제책략여원형궤상비，절유솔체13.1%。
Powertrain system and its energy control strategies are studied in order to improve fuel consumption of a kind of series hybrid tracked bulldozer. Mathematical models of engine’s output power, fuel consumption, and generator’s efficiency are established base on their dynamic working characteristic analysis and experimental data on test bench. By utilizing series-parallel topological structure between ultracapacitor and resistance, an ultracapacitor’s dynamic working model is setup, and its working scope of state of charge(SOC) is build. The lowest fuel consumption curve is found after above models’ optimization, and a power flowing control strategy based on the engine’s optimal fuel consumption is proposed. This power flowing control strategy is simulated under a bulldozer’s typical working duty. The variations of ultracapicitor’s charge and discharge parameters, like voltage, current, and SOC are demonstrated. The engine’s rotate speed, output torque, fuel consumption and the position of accelerate pedal are revealed comparing to these of the prototype tracked bulldozer with traditional mechanical powertrain structure. The results show that the proposed control strategy is verified well, and, the engine fuel economy can be improved 13.1%compared to the prototype one under the same typical working duty of the bulldozer.