| Energy shortage and environmental pollution has become an urgent and integrated problem which is needed to be solved but the traditional automobile industry is one of the biggest threat to energy and the environment. The development of clean and efficient energy for vehicles has already become an extremely imperative task. Fuel cell electric vehicle is a very ideal alternative for ones use petrol and diesel. vehicle.However, the fuel cell output characteristic is weak,When the load current increases, the voltage drops rapidly, and the output voltage fluctuations is large. Then it generally uses the DC/DC converter to match and converse the voltage. As the fuel cell electric motor controller call for DC/DC converter some control issued an order.DC/DC converter must respond quickly And it requires design of the rapid response system, better robustness. In this paper,automotive fuel cell electric vehicles,DC/DC converter and establish a mathematical model for the reasons of the chattering. It combines the sliding mode variable structure control and fuzzy control combined with organic and has given a fuzzy sliding control programme. Guaranteed by the variable structure control system stability, and the sliding mode has a good dynamic;by the fuzzy controller adjustment to the normal movement of the weakening of chattering, and with other control methods comparison, the simulation of the effective verification of the algorithm and advanced,specific studies as follows:First in the output characteristics of fuel cell research, on-board fuel cell electric vehicles DC / DC converter and the main function of topology, analysis of a DC / DC converter modeling method of the status,in the state of the theoretical basis of space law And construct of the system under the mathematical model..Secondly, the introduction of sliding mode variable structure control based on the theory of the establishment of the synovial variable structure controller, and then use the Simulink simulation software automotive fuel cell electric vehicles, DC/DC converter control system mathematical model simulation and analysis results. And the simulation of the traditional PI control to compare concluded.Finally, The chattering mostly impact of wider application of sliding mode control. In this paper,on the basis of studying on a system of in-depth research and chattering various reasons weakened chattering methods. Proposed a fuzzy sliding variable structure controller, which integrated the fuzzy control and sliding variable structure control their respective advantages so as to weaken the variable structure system chattering. And guarantee the stability of the system. It has a good dynamic. Adjustment of the normal movement so as to weaken chattering.For the start-up of systems and interference characteristics of a simulation test.The simulation results show that: The system to boot rapidly, overshoot is small; can resist the input voltage and load from the two disturbances.It can be achieved rapid response and stable output of On-board DC/DC converter in Fuel Cell Electric Vehices.
|
PDF Full Text Request