Abstract: In order to meet the development of the domestic electric car and to adapt to changes in the height of the bus to avoid damage to the battery and the body of the bus in the process of changing batteries, this paper designs a robotic system based on dynamics visual servo control system for the electric buses battery swap robot following the target, The robot consists of X, Y, Z three freedoms and the R-axis, T-axis freedoms which can adjust the battery angle relative to vehicle chassis and follow the changes of the height of the bus. In this paper, we design the robot using of robot dynamics visual servo technology, path planning, multi-axis motion control technology, multi-sensor technology and PID control theory. The system is stable, reliable and can rapidly follow the changes of the height of the bus by the system debugging and trial operation, achieving a rapid supply of energy to electric buses.
Abstract: Combining with the modern orchards’ large-scale development mode and requirements of precision agriculture construction, we designed an orchard long-distance intelligent irrigation system. GPRS network and ZigBee wireless sensor network composed of microcontroller, soil moisture sensor, zero-pressure solenoid valve and CC2430 are used in this system to transmits and control the data. By analyzing the soil’s water content of the sample and combining the advanced setting threshold, the system can send order to control the zero-pressure solenoid valve so that the long-distance control and intelligent irrigation are achieved. When puts into practice, the system shows a stable performance. It meets the design requirements in data acquisition, data transfer and long-distance control and deserves better promotion.
Abstract: The gasoline direct injection (GDI) engine is a highly non-linear and a delayed system. The engine modle with time-delays is derived. The delays consist of an intake to torque production state delay and a network -induced interval delay. Base on the Liapunov-Krasovskii function, the criterion of interval delay control system is proposed, which ensure the idle speed control system is stability as well as robust. The simulation results show that the H∞ control has good robustness,which improves the stability of the idle speed of the GDI engine.
Abstract: ILS (Instrument landing system) is one kind of the important airborne navigation systems. The performances of the airborne ILS navigation apparatus are vital to safeguard the safe landing of the aircraft. This paper reviews the basic work process of the ILS, summarizes the test theory from the artificial intelligence and virtual instrument view point, discussed the test system construction, and presents the detail design thought. Particular attention is paid to the failures isolating problems. It is shown that test system for airborne ILS navigation apparatus based on artificial intelligence and virtual instrument improved the accuracy and reliability.
Abstract: A control-system design for a two-wheeled self-balancing vehicle is discussed in this paper. We have developed a low-cost hardware platform based on AVR MCU, accelerometer sensor and gyroscope sensor, for which the critical circuits, such as sensors and motor driver, are introduced. The control strategy operates by two steps: a) securing the real-time vehicle posture by integrating the data from accelerometer and gyroscope sensors; b) using a closed-loop PID controller to keep the vehicle balanced. This control system is applied to a prototype two-wheeled self-balancing vehicle, whose performance has turned out to be a satisfaction.
Abstract: This paper presents a synchronization system of ground electromagnetic probe based on FPGA and GPS. In order to realize precise synchronization between transmitter and receiver, the paper uses the GPS module, the application of GPS-synchronized is a relatively good synchronization mode because of its independent of distance and topography. This paper makes the coordinated universal time of GPS and seconds pulse 1pps as the time reference, analyses synchronization principle and characteristics based on FPGA and GPS, designs time synchronization circuit, realizes the output of the synchronous enable signal. Finally it can realize the precise synchronization between a transmitter and several receivers.
Abstract: In order to reduce torque ripple. Studied direct torque control of motor that fed by matrix converter. Illustrated control strategy the multiple voltage vector of matrix converter. Full utilize big and small input voltage of matrix converter synthesis long, short and zero voltage vector based on direct torque control of motor that fed by matrix converter, through the rational use of long, short and zero voltage vector to reduce torque ripple. The simulation results demonstrated that the validity of theoretical analysis and modulation strategy presented.
Abstract: Based on the dynamic characteristics of EPS, whole vehicle and tire, the dynamic equation of the EPS system was established. The Krasovk’s method was used to obtian the candidate Lyapunov function for the EPS system. A nonlinear control for EPS system considering parameter uncertainty was presented by Lyapunov redesign approach. The results were obtained from simulation based on Dymola, where is shown that Control law of EPS have the robust performance.
Abstract: In the entire PV system, the maximum power point tracking (MPPT) has become an important part of the essential, the maximum power point tracking can improve the output power of photovoltaic power generation system as to improve the overall system power. Constant Voltage Tracking (CVT), Perturbation and Observation (P&O), incremental Conductivity, Short circuit control, Hysteresis comparing are the most commonly used methods. Due to a variety of methods have their advantages and disadvantages to each other, to improve efficiency, control accuracy, speed up the response, this paper, put up a program based on reforming the progress in dual-mode maximum power point tracking and this program can be faster and more accurate to find the maximum power point in the current environment, also reduce the oscillation near the maximum power point and improve the efficiency of solar photovoltaic grid-connected system.
Abstract: By reviewing the development of the electronic throttle abroad, it introduces the development of foreign electronic throttle. Control theory has been constantly enriched and control functions developed from single integrated. With the development of domestic research, some car manufacturing companies and university research institutions have obtained certain results. Articles in control theory focus on the theory of PID control, fuzzy control theory, sliding mode variable structure control theory research and more mature theory, and then, the above theories were compared. Finally, according to the articles of the current development state of electronic throttle, the article describes the prospect of the electronic throttle.