Advanced Materials Research Vols. 926-930

Abstract: For PFI (Port Fuel Injection) SI engine, accurate AFR (Air-fuel Ratio) control would keep TWC (Three-Way Catalyst) work in high efficiency range to achieve low pollutants emission. For ZS157FMI-3 motorcycle engine equipped with ZH600 ECS (Electronic Control System), a control strategy with close-loop feedback mode and feed-forward mode was designed for transient, quasi-steady and steady work states. One switching oxygen sensor was installed to form the close loop for quasi-steady and steady work states, and feed-forward control strategy based on a simplified fuel-film model was implemented to cope with transient AFR control. TP (Throttle Position) change rates were selected to be the determinant of which AFR control mode should be activated. For the validation of the control methods, bench tests were carried out in three typical work procedures. The results showed that AFR values of close-loop were close to stoichiometric one with relative error below 3%. AFR in acceleration or deceleration process may exhibit slight fluctuations, but the crest would be eliminated immediately. It concluded that the strategy designed in the study is able to cope with AFR control on variety of operation conditions for the experimental engine.

Abstract: In order to create a virtual prototype model to meet the engineering analysis, the dynamical model of ramming device in the automatic loading system is built and solvedby using an equivalent SDOF mechanical model, then three-dimensional model is built and imported to RecurDyn, a simulation software,then the virtual prototype is established completely, the result of simulation show that the virtual prototype model is reasonableand can be used for analysis and research of dynamics.

Abstract: An improved fuzzy semi-active control method forparametric vibration of the cable-stayed with MR damper was proposed. The parametervibration control of the cable M22 and the cable M13 of the Hongshuihecable-stayed Bridge was studied. The results show that the effect of theimproved fuzzy semi-active control strategy was better than that of the fuzzysemi-active control strategy. In addition, the proposed fuzzy semi-activecontrol strategy does not need to debug the scaling factor of input variablesand output variables and the MR damper required lower voltages. Therefore，theproposed method makes the fuzzy control more intelligent.

Abstract: The paper established an involute slope modification model of asymmetric spur gear pair. The characteristic of the involute slope modification was analyzed by changing different modification parameters. The contact stresses of asymmetric spur gear under different modification parameters were compared. Research results showed that the modification parameters influence the meshing performance of gear pairs.

Abstract: The MCU system is used to simulate laser signals and the signals received by avalanche transistors so as to conduct signal detection of actual circuit boards.With establishing a library of fault cases through the computer serial port, the MCU and the fault setting module can be based on to realize the fault simulation of actual circuit boards and conduct the training in fault detection and removal. The designed fault setting software and assessment software can be combined to assess the training effects of fault analysis, detection and removal. The developed prototype passes the test of training, showing good results and high training benefits

Abstract: In order to provide optoelectronic systems with convenient and practical online fault detection methods and means and solve the maintenance problem of vehicle-mounted optoelectronic systems, this paper establishes the external conditions for system excitation and detection by taking the entire machine and circuit interfaces as the objects to be studied and the industrial personal computer as the hardware platform and using VC++ for programming, realizing online fault detection and location.

Abstract: A fuzzy control algorithm of selective roll cooling was developed dependent on a qualitative knowledge possessed by skilled operators. The residual flatness deviation as well as the time and spatial variation in the deviation of flatness were chosen as linguistic sets in the fuzzy control algorithm. Limitation and membership function as well as reasoning rule of the fuzzy sets were determined in accordance with the practical process. Besides, linguistic variables were classed by taking into account the condition of practical rolling process. The fuzzy control algorithm utilizes the Mamdani reasoning method and MAX-MIN composition method to actualize fuzzy reasoning and uses weighted mean method to actualize evaluation of fuzzy output. The applications show that the fuzzy control algorithm of selective roll cooling is capable in flatness control and is significant to obtain better flatness.

Abstract: Through the assembling process analysis of the switch functional parts, the physical structure of the assembling equipment was designed and modeled, moreover, the schematic diagram of the pneumatic drive system was also designed on the basis of the motion requirements of the equipment, and finally, the I/O allocation and the electric control diagram were designed accordingly, together with the PLC programming flowchart plotted. Eventually, remarkable benefit has been exhibited after putting into production.

Abstract: In the light of the passive safety testing method of drunk driving, a new active safe product is designed in the field of automotive electronics: on-board automatic monitoring system for drunk driving. Based on PIC processor control system, the modularity is adopted including sensor detection sub-module, voice and display sub-module, a banned driving control sub-module after drunken, GSM sub-module, GPS positioning receive design ideas of sub-module, and complete the hardware circuit design. In MPLAB-IDE integrated development environment, the PICC compiler is adopted to complete the software design of the system. The maximum error of concentration testing experimental result is 8.2%.

Abstract: This paper involves a linear double inverted pendulum system whose the state space model is established by Lagrange function. In order to solve the chattering problem of the conventional quasi-sliding mode variable structure control, this linear double inverted pendulum system applies the fuzzy control theory to adjust the parameterwhich is in the sliding mode variable structure control law. Then the fuzzy theory is utilized to design the sliding mode and deduce the fuzzy sliding mode reaching law. The significance of this method is that it diffuses the control signal, reduces or avoids the chattering phenomenon of sliding mode control. For the most, the simulation results show that the linear double inverted pendulum system based on fuzzy sliding mode variable structure control not only retains the strong robustness of sliding mode variable structure control, but also improves the dynamic quality of the system and weakens the buffeting of the system. Thus the method is proved to have certain research.