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Volume 56 期 6，2026 2026年第56卷第6期

    QIN Jing, DU Tian-yu, LI Shang-shu, PEI Yi-qiang, LI Hong

    DOI：10.13229/j.cnki.jdxbgxb.20241328
    摘要：In order to solve the problems of low air utilization rate and poor fuel-air matching in a large bore opposed-piston two-stroke（OP2S） diesel engine， this paper uses three-dimensional CFD software to conduct an optimization design study on different injector diameters and key parameters of the combustion chamber of an OP2S diesel engine， clarifying their influence on spray mixing and combustion performance. The research results show that： for the OP2S diesel engine under the same combustion chamber conditions， the central area of the combustion chamber has a greater influence on the in-cylinder pressure and heat release rate； for the OP2S diesel engine mainly with swirl， the adoption of a shallow-pit-shaped combustion chamber can enhance the swirl effect， be beneficial to spray mixing， increase the flame diffusion area of the engine， and improve the combustion performance.  
    关键词：energy and power engineering;opposed-piston two-stroke diesel engine;injector nozzle diameter;combustion chamber;air utilization rate   
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    更新时间：2026-07-23

    WANG De-jun, PENG Cheng, LI Ying, ZHAO Jing

    DOI：10.13229/j.cnki.jdxbgxb.20241356
    摘要：This paper addresses the issue of vehicle control performance degradation caused by variations in load and road conditions， and proposes an optimization control method integrated with parameter identification. First， the impact of model parameter changes on the state prediction and constraints of traditional Model Predictive Controllers（MPC） is analyzed. Then， an adaptive law based on Lyapunov theory is designed to online adjust model parameters and compensate for control inputs， ensuring that the real system's response aligns with the nominal model. Additionally， an online road adhesion coefficient identification method based on the Brush tire model and Recursive Least Squares algorithm is proposed to ensure the accuracy of control constraints. Building upon this， a hierarchical controller is constructed， with the upper layer being the MPC integrated with parameter adaptation， and the lower layer being the tire force allocator. Simulation results from CarSim/Simulink co-simulation demonstrate that this method effectively corrects parameter errors and maintains control performance， thereby improving vehicle safety， stability， and robustness.  
    关键词：control theory and control engineering;vehicle control;hierarchical control;adaptive control;parameter identification;model predictive control   
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    更新时间：2026-07-23

    BI Yu-hua, PENG Zheng-hua, NIE Xue-xuan, SHEN Li-zhong, CHEN Gui-sheng, LIU Shao-hua

    DOI：10.13229/j.cnki.jdxbgxb.20241296
    摘要：Based on an engine test bench and atmospheric simulation system， this study systematically investigated the influence of main injection timing， rail pressure， pilot fuel quantity， and pilot injection timing on the combustion and emission performance of a diesel engine under conditions of 1400 r⋅min-1 and 200 N⋅m. The study findings indicate that with the increase in altitude， the in-cylinder pressure and heat release rate of the diesel engine decrease， while the combustion temperature and rate of pressure rise slightly decline. The emissions of total hydrocarbons and smoke opacity are reduced by 38.77% and 27.85%， respectively， whereas the emissions of carbon monoxide and nitrogen oxides increase by 23.31% and 0.64%， respectively. Advancing main injection timing in agricultural diesel engines at high altitudes can lower effective fuel consumption rate but significantly increase NOx emissions. To compensate for the prolonged ignition delay， further advancement of main injection timing is necessary. Raising rail pressure from 80 MPa to 120 MPa enhances atomization， reducing THC， CO， smoke emissions， and BSFC， yet NOx emissions rise by 25%~30%. Increasing pilot injection shortens the ignition delay， lowers BSFC， but requires combining with main injection timing advancement to curb NOx formation. Advancing pilot injection timing slightly suppresses NOx emissions at high altitudes. A combination of "main injection timing advancement + 100 MPa rail pressure + appropriate pilot injection volume" is suitable for high-altitude environments. Coordinating and optimizing the main-pilot injection strategy and injection pressure can enhance the performance of agricultural diesel engines at high altitudes and offer a theoretical basis for their high-altitude adaptability design.  
    关键词：power engineering;altitude;diesel engine;main pre-injection strategy;combustion;emissions   
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    更新时间：2026-07-23

    WANG Yun-fei, ZHAO Ji-yun, ZHANG Zhong-hai, CHANG Ren-qi, DONG Hao-hao, DIAO Qi-sheng

    DOI：10.13229/j.cnki.jdxbgxb.20241243
    摘要：A cascade controller based on neural network compensation is designed for the feed system oftruck-mounted drilling rig. Firstly， the global fast terminal sliding mode surface is used to eliminate chattering and improve the convergence speed in the position control outer loop， and a disturbance observer based on radial basis neural network is designed to estimate and compensate the integrated disturbance of the system. Then， backstepping control is used to calculate the actual input voltage of the whole system in the inner loop of pressure control and the stability of the closed-loop system is proved by Lyapunov theory. Finally， the effectiveness of the designed controller is further verified by simulation and experiment.  
    关键词：truck-mounted drilling rig;neural network;disturbance observer;cascade control;global fast terminal sliding mode   
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    更新时间：2026-07-23
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