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Luoyang, China

Liu S.-J.,Jiangsu University | Sun J.,Jiangsu University | Li Z.-D.,YTO Group Corporation | Wang J.,Jiangsu University | Liu W.,Jiangsu University
Zhendong yu Chongji/Journal of Vibration and Shock

Small non-road SI engine's vibration performance affects the usage performance and reliability of fitting machines. The 168F gasoline engine was taken for example. Simulation analysis of gasoline engine's vibration performance using the engineering software were performed based on test studies. It was shown that such gasoline engines are lighter, their reciprocating inertia force is small because they are made of aluminum alloy and there are no sleeves (bearings) in connecting rods; the size's deviation of the crankshaft balance block has a larger effect on the balance value of the reciprocating inertia force, it causes the poor vibration performance of the whole machinery. The 168F gasoline engine's calculation results showed that when the original cylindrical dimension of crankshaft balanced block changes within the tolerance value, the equivalent vibration intensity changes in the range of 56 to 102.8mm/s; when the cylindrical surface of crankshaft balanced block is machined and its radius is optimized to 42.43 ± 0.15mm, the equivalent vibration intensity changes in the range of 56 to 64.1mm/s, a significant improvement appears compared to the original. It was shown that the control of dimensional tolerances is vital to controlling a non-shaft balance single-cylinder engine's vibration performance and conformity of production. Source

Xu L.,Henan University of Science and Technology | Li J.,Henan University of Science and Technology | Wang B.,YTO Group Corporation
Journal of Convergence Information Technology

Starting control is one of the most important control contents in a tractor equipped with automatic mechanical transmission (AMT). The working condition of tractor is variable, and the operating control for driver is complex, therefore it is an important part in auto-control to seek engine and clutch control strategies to satisfy the requirement for AMT tractor starting. In this paper, mathematical models of engine, clutch and farm implements are established. The starting performance is evaluated by tractor jerk and clutch slipping work. Tractor starting simulations are carried out based on DFH 1302R tractor. Through the work above, several key points are put forward in optimizing control strategies for tractor starting. Source

Cao X.,Dalian University of Technology | Yuan J.,YTO Group Corporation | Li W.,Dalian Yiliya Construction Machinery Co. | Ding C.,Dalian Shipbuilding Industry Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering

Aiming at the problems of poor precision, low operation efficiency and low security due to the load oscillation of luffing motion for crane, an error asymptotic compensation control method was proposed to minimize the sway angle of load. Based on the analysis of error asymptotic compensation control theory, the error asymptotic compensation controller was designed. Through appropriate adjustments to the two stage compensation coefficients, the sway angle of the lifted load was gradually decreased, meanwhile, the requirements of the acceleration and the pump displacement were met. The MATLAB simulation results show that error asymptotic compensation controller has good robustness and control precision for different ropes and jib lengths. After the crane began to brake, the sway angle is reduced to below 0.003 rad in 10 seconds. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved. Source

Xu L.,Henan University of Science and Technology | Zhou Z.,Henan University of Science and Technology | Peng Q.,Henan University of Science and Technology | Wang B.,YTO Group Corporation
Zhongguo Jixie Gongcheng/China Mechanical Engineering

To improve the transmission ratio discontinuity problem during the gear shift process in a multi-gear fixed step ratio transmission of the tractors, a hydro-mechanical CVT for tractors was developed. Taking DFH 1302R tractor as the research object, the stepless speed regulation characteristics, condition of smooth shifting, torque characteristics, power split flow characteristics, efficiency characteristics and tractive characteristics of HMCVT were analyzed. By theoretical analysis, the results show that the designed HMCVT has advantages of wide speed governing range, large power transmission, high drive efficiency and steady transmission, which can meet the requirements of complicated variable working conditions of the tractors. Source

Zhao Y.,YTO Group Corporation | Yang W.,Luoyang Tractor Research Institute
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery

This paper aimed at the technological development of agricultural tractor in the world. The current technology and performance of the vehicles and parts were explained. The technology characteristics and configuration of the agricultural tractors in each power range were summarized and analyzed. Finally, the technical development and disadvantages of Chinese agricultural tractors were analyzed and the key technologies were proposed. Source

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