Applied Mechanics and Materials Vol. 678

Abstract: The robots operate in a specific environment, the characteristics of which may remain constant or variable over time. While battery technology is of great interest for mobile robots, but it is not reliable in the time, there are several strategies for the storage of energy, as well as strategies for harvesting energy from the environment in various ways and energy management using sophisticated control techniques to improve power supply costs. One of these strategies is to use solar energy to power mobile robots. The solar cells appearance is due to the need to supply power spacecraft since not require maintenance for a period of time.

Abstract: This paper addresses a position and speed tracking problem for high-speed train automatic operation with actuator saturation and speed limit. A nonlinear model predictive control (NMPC) approach, which allows the explicit consideration of state and input constraints when formulating the problem and is shown to guarantee the stability of the closed-loop system by choosing a proper terminal cost and terminal constraints set, is proposed. In NMPC, a cost function penalizing both the train position and speed tracking error and the changes of tracking/braking forces will be minimized on-line. The effectiveness of the proposed approach is verified by numerical simulations.

Abstract: To implement intelligent vehicle control system based on magnetic field detection, automation navigation scheme based on difference algorithm is proposed. The feature of magnetic field of the road is analyzed, and layout method of sensors is proposed, and signals of magnetic field sensors are gathered and filtered, and road control strategy based on difference algorithm is proposed, and steering gear is used to implement cornering of intelligent vehicle, and position PID algorithm is used to implement speed control of intelligent vehicle. The experiment result shows that intelligent vehicle using this scheme can work steadily at high speed, and has higher practicability and is worth to be propagated in many fields.

Abstract: In order to develop actuation circuit for high pressure common rail injector solenoid valve, the high and low voltage time-sharing actuation control method based on current feedback was researched. A finite state machine tool called stateflow was used to establish the actuation model of solenoid, and the intelligent actuation control circuit was developed according to the model and MCU. The driving current can be adjusted automatically according to “Peak-High-Low” three-stage current, and the circuit can troubleshoot the state of solenoid. Driving Experiments on solenoid and injector were carried out and the results show the good performance of the intelligent actuation control circuit.

Abstract: Aiming at the shortcomings of the method of conventional hysteresis current control for three-phase PWM rectifier, this paper proposes a new method, which combines Variable-frequency hysteresis current control with Space Vector Pulse-width Modulation (SVPWM) strategy. With this method, the error current can be limited in a given hysteresis loop by switching the space voltage vector of the voltage source PWM rectifier (VSR) in real time. And it can get a faster response for the current, while the frequency of the switches can be reduced. So, this method can obtain a high quality for the current control of PWM rectifier.

Abstract: Bidirectional DC/DC converter is used for the battery charging and discharging. The sliding mode controller based on state space averaging algorithm is used for controlling bidirectional DC/DC converter. Two kinds of working modes, buck mode and boost mode, have been analyzed and three kinds of working states which are consisted by two working modes have been deeply discussed, and the automatic switch logic diagram when battery charging and discharging through the bidirectional DC/DC converter has been presented. Situation of system based on S1, S2 conducting alternately has been studied, and the simulations were also presented. According to the results, the characteristics of good stability and transient can be confirmed.

Abstract: An adaptive neuro-fuzzy controller of nonlinear systems is presented based on data fusion method. It reduces the input dimension of the controller using data fusion technique and simplifies the fuzzy controller’s design. The fuzzy controller was designed with self-learning of neural networks. The simulation results show that the performance of the system is superior to that using conventional fuzzy controller. It is rewarding for the research on combination of data fusion method and intelligent control technique of nonlinear systems.

Abstract: The operating characteristic of hydro-mechanical gearbox is vital to the vehicle performances. Basing on the testing terms of bench test and studying the dynamic operating performances of hydro-mechanical gearbox, a dynamic gearbox simulation model is built with the use of AMESim interface, which includes the engine model, torque converter model and the electro-hydraulic control model. The gearbox efficiency, the power loss without load, the oil pressure curve of clutch shift, all the parameters above could be simulated with the model. The results of gearbox experiments made sure that the gearbox is qualified the designing requirements and working in a good performance, which could be compared with the results of simulation to testify the correctness of the model, meanwhile, proved the perspectiveness and instructiveness of simulation model in gearbox designing and researching.

Abstract: To reliably realize the grid-connection generating of brushless doubly-fed machine (BDFM), this paper firstly focuses on some essential issues, such as amplitude, frequency and phase of power winding voltage; the control of active and reactive power. Deducing the control method of power winding voltage amplitude, frequency and phase based on basic electrical machine principle. Referring synchronous machine theory, the modulation principle of active and reactive power for BDFM is obtained. Then, the connection progress to grid is researched by setting up the control platform based on DSP. The experimental results show that the amplitude, frequency and phase of power winding voltage are effectively controlled and the active and reactive power could be regulated when adopting the decoupled voltage control strategy. This control method provides a practical realization manner in the application of wind power generation and so on.

Abstract: Application of Soft-switching technique and fuzzy control is discussed to optimize traditional induction cooker controller. Soft-switching technique is used to improve output efficiency of induction cooker. Switch voltage regulation by fuzzy control are used to adjust output power of induction cooker. Soft-switching inverter consists of resonant DC link and LC resonant network. Resonant DC link is used to realize ZVS, and resonant network is used to eliminate harmonics. Fuzzy control based on look-up table is adopted to adjust duty cycle of switch mode regulated power supply, which changes the DC supply voltage, so that amplitude of AC signal inverted by induction cooker is changed to adjust output power of induction cooker according to the requirement, , ensuring the operating temperature aligned with the target temperature.