Mode switching between engine and motor has an important impact on power and driving performances of hybrid electric vehicles. In this paper, the clutch fuzzy control strategy is investigated for the process of pure e...
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Mode switching between engine and motor has an important impact on power and driving performances of hybrid electric vehicles. In this paper, the clutch fuzzy control strategy is investigated for the process of pure electric mode switching to engine single driving mode of a single-axis parallel hybrid power system equipped with automatic mechanical transmission(AMT) as an example. Based on the dynamics of mode switching process, three fuzzy controllers are designed: a fuzzy controller of driving intentions, a fuzzy controller of clutch target engagement speed, and a fuzzypid controller of the actuator voltage of clutch. Simulation results show that the proposed control strategy can effectively reflect the driving intentions, and make the clutch engagement fast and smooth to ensure the smoothness and efficiency of the switching process from pure electric mode to engine single driving.
This paper investigates the force servo hydraulic press control system based on fuzzy pid algorithm. Since the force servo pressure of the hydraulic control system which manifests the manufacture quality is affected b...
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This paper investigates the force servo hydraulic press control system based on fuzzy pid algorithm. Since the force servo pressure of the hydraulic control system which manifests the manufacture quality is affected by the external load acting on the hydraulic cylinder, the mathematical model of the force servo hydraulic press system（FSHPS） based on the feed-forward compensation correction is established. The steady state error reduction and the phase lead correction of the system are carried out. The open-loop time domain and frequency domain indicators of the FSHPS illustrate the stability of the system, but the control performance such as rapidity and accuracy need to be improved. According to the transfer function of the FSHPS, a fuzzypid control scheme is designed. The simulations of the system show that the control performance of the FSHPS based on the fuzzy pid algorithm is greatly improved.
Based on the high precision double nozzles developed six axis vessel 3D printing equipment,the subject mainly focus on the cell printing process,nozzle design and control technology and its temperature field simulatio...
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ISBN:
(纸本)9781467397155
Based on the high precision double nozzles developed six axis vessel 3D printing equipment,the subject mainly focus on the cell printing process,nozzle design and control technology and its temperature field simulation *** the step response and maximum atmospheric pressure,simulation and comparison between BECKHOFF temperature pidalgorithm and a self-tuning fuzzy pid algorithm using SIMULINK *** results show that the temperature self-tuning fuzzy pid algorithm can reduce the delay time 12 s and the steady-state time 230 s,and the overshoot is only 1%when the nozzles achieve continuous *** robustness and the dynamic performance has great improvement,and the temperature self-tuning fuzzy pid algorithm can effectively meet the continuous extrusion process of jet nozzles and blood vessel forming quality and active *** the program of BECKHOFF temperature control module based on the superiority,and it provides a control method to seek to promote the clinical application of the vascular 3D printing as soon as possible.
In order to reduce the design difficulty and cost of constant pressure water supply control system controlled by PLC, STM32 was chosen in this system as processor and intelligent constant pressure water supply monitor...
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In order to reduce the design difficulty and cost of constant pressure water supply control system controlled by PLC, STM32 was chosen in this system as processor and intelligent constant pressure water supply monitoring system was designed based on Modbus-RTU communication protocol to realize the real-time data acquisition, display, fault alarm and water pressure alarm function. In addition, accuracy will be improved and energy consumption will be reduced when the pump outlet pressure of the system is operating. The software design of computer system using fuzzy pid algorithm. The system can control the speed of water pump according to dynamic output frequency signal of the data acquisition to achieve a good control about constant pressure of water supply and pump frequency meeting the design requirements of the system. Finally, getting the system simulation results and test results and the interpretation and analysis about them were given. Experimental results show that the system is economical and practical. It has strong anti-disturbance ability and can be widely used in industrial control field.
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