Advanced Materials Research Vols. 945-949

Abstract: Volkswagen AG4 Automatic transmission ,for example , was detailed analyzed by logical method from the shifting operation, interlocking of combining elements and failure protection. Shifting operation must first meet the shifting demand ,mangy oil line criss-cross in the automatic transmission hydraulic system circuit ,in a particular gear ,some components must to be meet bonding requirements interlock between them ,finally ,vehicle need a failure system to protect the oil line to prevent failures in order to travel to the failure of the automatic transmission electronic control system .By analyzing ,design principles and ideas of automatic transmission shift controlling hydraulic system were derived.

Abstract: A secondary hydraulic transmission control method is presented based on the fuzzy-neural network control which introduces the fuzzy control into neural network. The simulation results show the self-adaptive ability and controlling performance of the secondary hydraulic transmission system is improved.

Abstract: To research aerodynamic layout of the two-dimensional correct projectile, the model of projectile under different aerodynamic layout was established. Various kinds of aerodynamic dates were obtained through aerodynamic simulation. Through the establishment of suitable for two-dimensional modified ballistic model of the projectile, the capability of correcting has been received for the different layouts of the rudder. The simulation results show, to meet the aerodynamic layout of the two-dimensional correct projectile and flight stability, the rudder is closer to the head of the projectile, the correction ability is better.

Abstract: In this paper, whole vehicle model is established by Matlab/simulink. Locking-up process of torque converter is simulated based on whole vehicle model. The influence of slope K of oil pressure of lock-up clutch to the performance of vehicle is analyzed. Golden section method is proposed to calculate slope K of oil pressure of lock-up clutch in the Locking-up process. The simulation result shows: Locking-up quality of torque converter is effectively improved by slope K calculated by Golden section method.

Abstract: Flow characteristic of motorcycle electronic injector is one of the most important factors to determine the electronic control system design, and directly affects the accuracy of fuel control unit of the motorcycle engine. Combined with the LabVIEW software programming, the experiment on research and development of electronic injector could control the lower computer rapidly and conveniently. As well it could accurately obtain the flow characteristics of small injection pulse width and the normal one of motorcycle electronic injector. It will achieve the goal of high efficiency, fast and accurate measurement of flow characteristic of motorcycle electric injector.

Abstract: In wind tunnel experiments, in order to adjust the attack angle continuously, the support mechanism movement should be steady and smooth. However, the electro-hydraulic servo system is a typical nonlinear, time-varying and uncertainty system, and the wind tunnel environment is very complicated. To address these problems, an on-line identification and generalized predictive control (GPC) strategy is proposed in this study. Firstly, the Labview and AMESim are integrated to build an electro-hydraulic system simulation model. Secondly, the controlled auto-regressive moving average (CARIMA) model of the electro-hydraulic system is developed. Thirdly, the influence on the system performance owing to the control parameters, model parameters, and external disturbance are widely discussed and deeply analyzed. At last, a test platform is constructed with the National Instruments (NI) embedded real time technology. The proposed control strategy is tested and verified on this test platform. The experimental results show that the angular velocity control precision reaches 0.01°/s. It implies that this control strategy has a good performance for nonlinear velocity control. Thus it satisfies the requirement of the continuously adjusting attack angle in wind tunnel experiments.

Abstract: The composition and working principles of the constructed Hybrid Electric Vehicle’s Electronic Throttle Control System are introduced. This paper presents the control strategy, and implements the Electronic Throttle Control System based on Fuzzy PID algorithm. It analyzes the resolution, react characteristics and dynamic tracking performance of the control system, and also discusses the anti-jamming measures under the automotive complex operation condition. The real vehicle test results demonstrate that this electronic throttle control system features better tracking and robustness.

Abstract: Based on the analysis of the grinding model and grinding process of ball nut, the grinding process software for ball nut is developed by using VB programming language and Access database technology. Afterwards, the software is integrated into the Siemens SINUMERIK 840D System. As a result, it realizes the database management of grinding parameters and the automatic generation of machining program, thereby simplifying the process of CNC operation and improving the production efficiency greatly.

Abstract: This paper analyzes the structure and classification of five-axis CNC machine, According to the nonlinear error analysis, tool center point and put heart point location model is established and derived the space of five-axis CNC machine tool cutting tool length compensation algorithm formula;Combined with two-dimensional CNC machine tool compensation principle and Kinematics Transform Algorithm (KTA) formula the same radius compensation algorithm formula is deduced, and within the scope of linear error analysis verified the result of the algorithm.Cutter compensation technology provides a method for the space.

Abstract: At present, Non-Uniform Rational B-Spline (NURBS) curves are mostly used to generate arbitrary contour of a complex shape in the CAD field. In this article, a new method with NURBS technology is presented and realized in a location and federate controlling system. In the method, the tool paths and the cutter locations (CL) were represented into NURBS curves based on the same knot vector. The above CL data was firstly calculated and then transformed to five motion commands of five axes of machine through the real-time post-procession algorithm. The acceleration/deceleration controlling method is also presented to avoid the impact of machine. The proposed 5-axis spline interpolation method is realized and the experimental result of machining shows that the method is valid.