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- 저자 : Song En-zhe (검색결과 3 건)
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Yun Long,Chong Yao,En-Zhe Song,Quan Dong,Yan-Min Wang 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.2
In this paper, an adaptive second-order sliding mode control approach is proposed for the performance improvement of electronic throttles (ET). Based on the traditional twisting approach, a novel adaptation mechanism based on the online zero-crossing checking is contained in the modified approach to make the control magnitude of the controller at the minimum admissible level. The idea behind it is to calculate the number of zero-crossings of the sliding surface in real time. The guaranteed stability condition and convergence region of the system are also deduced. In order to further prove its high adaptation capability, the commonly used adaptation mechanism called the Lyapunov-based type is also introduced for comparative study. Simulations and experiments validate the proposed approach with the advantages of chattering elimination, high speed and accuracy in the control of ET systems.
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Yao Chong,Fan Li-yun,Dong Quan,Song En-zhe,Tian Bing-qi 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
Electronic unit pump (EUP) can satisfy both diesel engine emission legislation and fuel economy by improving injection pressure and numerical control. Fluctuations in cycle fuel injection quantity (CFIQ) of EUP determine the coherence and stability of the EUP fuel injection system. The EUP simulation model is developed in the AMESim environment. The method for the simulation experiment is designed in the MODDE environment using the design of experiments method. The results of the simulation reveal the variation laws of correlation between parameters with interaction or no interaction under overall operating conditions of diesel engines. In addition, the results also show the EUP system is a complex nonlinear system. Under overall operating conditions, all the characteristic parameters,such as fuel supply pressure, cam profile velocity, control valve lift, injector opening pressure, injector needle lift, and injector flow coefficient,have significant correlation with CFIQ. The interacting first-order factors exhibit the most significant correlation with CFIQ. The self-interacting second-order factors have significant secondary correlation with CFIQ.
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Computation of pressure fluctuation frequency in electronic unit pump for diesel engine
Tian Bing-qi,Fan Li-yun,Qaisar Hayat,Ma Xiuzhen,Song En-zhe,Hao Wang 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
Pressure variations inside a fuel injection system can lead to fluctuations in injected fuel quantity during injections and therefore candirectly impact the stability and performance coherence of the fuel injection system and the engine it matched. Concepts of hydrauliccapacitance and hydraulic inductance are introduced into fuel injection system by referencing LC oscillator electric circuit. A LC undampedhydraulic mathematical model is developed based on the structural parameters of the electronic unit pump (EUP). Pressure fluctuationfrequency during injection process at different operating conditions of the EUP is computed by the LC undamped model. It isobserved that the frequencies of pressure fluctuations tend to increase with the fuel injection process. Pressure curves and pressure fluctuationfrequencies obtained by experiments at different operating conditions validated the results predicted by the LC undampedmathematical model.
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