Advanced Materials Research Vols. 694-697

Abstract: Aiming at improving vehicle’s handing stability, based on Simulink and SimPower, in this paper, a steer-by-wire(SBW) model with actor physical model has been built. Based on node and saddle points’ position on β-r phase plane, analyzing different factors influence on handing stability, such as wheel angle and speed. Then put forward an ideal transmission control strategy with energy phase plane feedback. Through simulating and analyzing with phase plane on limit steering condition, this paper verifies the control strategy with feedback will increase handing stability more than traditional ideal transmission strategy.

Abstract: A new magnetic plate-type precision seeding production line and its control system were designed based on the magnetic seed-metering principle. The control system is consisted of DVP-40ES Programmable Logic Controller and LJD-51-XB+ Mico Controller Unit. The PLC control system controls the working flow of the production line. The MCU control system controls turnover movement of the sowing board and up-and-down movement of the seed case for whole tray seed-filling and sowing. Seeding tests for the magnetic powder coated rape seeds showed that the rate of single-seeding, over-seeding and miss-seeding were 90.2778%, 4.6875% and 5.0347% respectively. The seeding speed was 257 trays per hour, an average of each tray with 14s. It meets the requirements of precision seeding. The system design is reasonable and reliable.

Abstract: Aiming at the problem of MIG welding and considering the existing analog control wire feed system has the disadvantages of low response speed, low control accuracy and poor stability. This thesis designs a set of digital control wire feed system based on LPC2132 microprocessor and introduces the control principle of wire feed motor, CAN bus interface circuit and PID control algorithm. Under the condition of power grid voltage fluctuation and load change, we do a lot of experiments. The results show that: the wire feed change rate of designed system is very small, which not only meets the requirements of JB/T-1998.MIG/MAG arc welding standard, but also greatly improves the accuracy and stability of control system.

Abstract: This study aims the development of a control strategy of steer-by-wire automotive with joystick. This control strategy makes driver able to change or maintain the steering angle of road wheels of the vehicle by joystick, provides feedback force to the driver and offers variable steering ratio, variable force feedback and proper damping. The control strategy was mathematically modeled and implemented using the simulation tool Matlab/Simulink and tested to inspect its effectiveness. The result of the test proves the control strategy is effective and the performance of a joystick steering system can be comparable to a traditional steering wheel by applying this control strategy, indicating potential possibility of joystick-steered automotive.

Abstract: Multi-loop NCS is widely used in machinery networked manufacturing production line. The performances of NCS are influenced by the network scheduling and some uncertainty factors, such as transmission rate, delay, loss rate of packet, disturbance, and so on. Considering these influence factors, a simulation model of a multi-loop is constructed using TrueTime toolbox of Matlab software. The related study methods of performance of NCS are given. As the result of simulation, the performances of multi-loop NCS are observed and analyzed. The work done in this paper is very meaningful and helpful to further make related control strategy improving the research on performances of multi-loop NCS.

Abstract: Being the charging of inefficient and long time, the current charging for the Outburst Prediction Instrument has great damage to the battery. A new battery charger for mining electric locomotive is developed based on Intelligent technology. Adopt new Buck topology, based on the best charging of the curve, wave picking intermittent plus-minus zero pulses used in charging method, intelligent control techniques implement functions such as data collection, complex control algorithm, PWM output control. According to the detection of the battery state automatically adjusting the parameter of the charging, realize the battery recharge and polarization discharge. The charger uses the improved variable current intermittent charge method to charge batteries. The experimental show that the charger has advantages of small size, light weight, easy use, high efficiency and less maintenance.

Abstract: An operation and control simulation platform for isolated power grid are set up, which is based on the detailed models of the boiler, turbine, Coordinated Control System (CCS), Digital Electric-hydraulic Control system (DEH), Overspeed Protection Controller (OPC) and so on. By means of simulation, the accuracy of this platform is verified and the cause leading to high frequency of the isolated power grid is proposed..In addition, the control strategy for high frequency of isolated power grid based on wide area measurement data is proposed.

Abstract: The evaluation tests play an important role in modern vehicle development. As a mean of judging vehicles performance and quality in the design period, the evaluation tests guide the development and the design. In this paper, objective evaluation of ESP is researched based on the self-correcting threshold PD control algorithm and ESP hardware-in-loop simulation test bench. Real-time test bench is used to simulate the different conditions and the evaluation methods of ESP are tested to verify the effect. By hardware-in-loop simulation, the results demonstrate the objective evaluation method evaluates the ESP system in accordance with the results of self-correcting threshold PD control algorithm and the method could accurately reflect the ESP control effect.

Abstract: This paper analysis the problem of a switched reluctance motor (SRM), which is based on the phase currents by using three independent current sensors. In addition, the reaching condition and stability conditions of sliding mode control (SMC) method has been discussed, and it has been applied to SRM speed control loop that compensates the torque ripple on the torque output. The proposed sliding mode controller performs better than the traditional PI controllers and is also more effectively to the external disturbances. For the switched reluctance motor, one of the factors of the torque ripple is mutual inductances, so the mathematical model of the SRM should consider its influence. And, the mechanical sensor has been used to sense the rotor position. The simulation experiment results of the control scheme using Matlab show that the proposed method for the switched reluctance motor is effective.

Abstract: Engagement control of the clutch in the starting process is the core part and difficulty of the Automated Mechanical Transmission (AMT) control strategy, which was directly related to the clutch disc lifetime and riding. Engine speed, clutch speed and throttle angle are the only signals to develop clutch control strategy in the entire start-up process made by Transmission Control Unit (TCU) in a vehicle equip with AMT. The TCU even need to determine the driver's intention to select different control schemes. In this paper, fuzzy logic control was adopted in order to eliminate the impact of subtle change during driver operation, thus the start quality was optimized.