Dsp-based Natural Gas Engine Speed Fuzzy Control Strategy

Research of natural gas engine is produced by shortage of energy and problem of environmental pollution day by day in the world. The natural gas is a kind of economic fuel, there are abundant natural gas resources in our country, developing the natural gas engine can fully utilize domestic resources and reduce the reliance on the international energy market, natural gas engine has a bright future. It becomes an important subject that electronic control system of natural gas engine is researched. The constant perfection of the electronic control system makes performance of power, economy and discharging of natural gas engine improve constantly.System of this thesis design adopts DSP controller as hardware core, hardware system gathers by signal module, man machine interface module and power module. Signal module mainly sends speed and temperature signal to DSP controller after amplifying and shaping; man machine interface module mainly realizes display and fault alarm function; power module offers the power that the system needs.Expect much to those performance or precision, real-time character is strong, small, embedded occasion, it may be a kind of implementation method with higher performance-cost ratio to motion control on the basis of DSP controller.Control inflow of air and natural gas according to the speed and temperature of the natural gas engine, make abundant burning, in order to make speed to be invariable, improve power performance, at the same time, can reduce pollution. This thesis foundation speed change, speed rate of change and temperature change design three input two output fuzzy controller, adopting fuzzy control algorithms, through simulation of the system, the fuzzy controllers designed can reach very good result.The obvious advantages of the fuzzy controller control rules do not receive any restraint, can not be totally analyzed, benefit to discuss and revise with the operator with practical experience together, adopt various kinds of good control thoughts. Using the computer to realize fuzzy control, it is convenient for people to adopt the natural language to exert one's influence on plant. In addition, this kind of control rule has very great currency, can be suitable for many kinds of different plant through small modification.In chapter 2 we introduce main characteristics of basic knowledge of the digital signal processor of TMS320LF2407 chip. In chapter 3 we provide hardware design of control system, including power module, signal sample module and man-machine interface module. In chapter 4 we show basic theory knowledge of fuzzy control, design process of the fuzzy controller and design and simulation of fuzzy controller of natural gas engine. In chapter 5 we mainly explain design of systems software.