The LED in the application of city road lighting

The LED lighting industry is a new emerging industry, with its unique advantage, Long life, energy saving, high brightness) By the people of all ages, referred to as a revolution in the field of lighting in the 21st century. LED lighting gradually in recent years to develop in the direction of high power, increase year by year, lighting applications quickly, this is the incandescent light bulb and gas discharge lamp again since the introduction of human lighting revolution. Compared with the gas discharge lamp, high power LED has small, mercury-free harm, the earthquake, safe low voltage, can frequently, long service life and convenient application and other irreplaceable advantages. The photosynthetic efficiency while also cannot overcome represented by sodium high photosynthetic efficiency of gas discharge lamp, but 20% ~ 30% growth each year to a full of expectation for the future. At present, in the field of high-power outdoor lighting, gas discharge lamp, though still occupy more than 98% of the 'turf', but this is just a dusk scene. In China, Shanghai, xiamen, Beijing, dalian, nanchang, xi 'an, and other large and medium-sized cities of outdoor lighting has considerable scale, a considerable portion of the LED lighting demonstration project of the finished. Otherwise, chongqing, guangzhou and other many provinces, the city has launched the LED industry chain construction project. In foreign countries, because of Australia, the United States, Europe and many countries have been announced, will start from 2010 ~ 2012 respectively according to traditional lighting. More and more, more and more obvious signs that a new technology revolution, to the fact,.

1 road lighting design in the past, usually by the designer's experience in road lighting design, it is difficult to be scientific and reasonable, economic and energy saving. Today, we use Germany DIALux4 DIAL company development. 10 lighting design software, can be conveniently and accurately calculate the rationality of the design of evaluation. Below we to a two-way six-lane highway ( The main city level) For example, simulation calculation of lighting design.

　　( 1) Design basis: on the basis of CJJ45 - 2006 city road lighting design standard of motor vehicle traffic road lighting standard section of the requirements in table 1:

when after the completion of the fuzzy control table, the table is stored in the PLC memory, the quantitative factors Ke, Kec, Ku in PLC fuzzy control query, obtained by the fuzzy output, output multiplied by quantitative factor can have the actual output, to adjust the output frequency of frequency converter, control the water pressure to change the motor speed to achieve.

among them, the fuzzy control table query is the key to the process design. In the proposed a new method to realize fuzzy control query table. E, EC first established. fuzzy comprehensive domain elements into { 0,1,2,3,4,5,6,7,8} And the sampling value E, Ec converts into data blocks DBW0 and DBW2 DB2 unit; According to the control results in the query table 1 will from top to bottom, from left to right in the order placement data block DB1 unit, the first address for DBW0. Using pointer address look-up table method. Control the amount of base is 0, offset for the 2 x ( 9×E+EC) To determine the amount of control an absolute address 0 + 2 x ( 9×E+EC) 。 Through pointer variable stored in the address U fuzzy value. Design of ladder diagram is shown in figure 1.

4 conclusion

PLC volume small, the function is strong, flexible, general and convenient maintenance; Fuzzy control overshoot volume is small, system stability, strong robustness, by adopting the combination of the two methods to realize the mine drainage, practical effect is good, the system runs stably, energy-saving significantly, has the certain promotion value.

M along the longitudinal of grid number, N horizontal grid number; ( Above M = 10, N = 4) ; E said measuring zone at the four corners, the illuminance values; E delta said the sides of the measurement zone in addition to the four corners of illuminance values; E low said measuring area of illuminance values within four outside. By testing the lighting area of illuminance value to calculate the intensity of illumination evenness, intensity of illumination evenness = minimum illuminance value/average illuminance values in a region. 3 conclusion

LED lighting era is coming, road lighting design combined with lighting application will get twice the result with half the effort. Can better LED lighting for the city.

edit; Steve