ࡱ> ac`n)` Rbjbj2{{"xxxxxxxT"T"T"T"H#\|B#@%@%@%@%S&''T{',AAAAAAA$rDhF`A]x+O&S&++Axx@%@%6B---+^x@%x@%A-+A--:?2,xx2@%# rw'T"/,^k2 _@TLB0|Bu2.:G,d:G22\:Gx2` '9(h-(T('''AA,'''|B++++ p pxxxxxx WNPLCvRpp)n^f~c6R|~ Os~10 f20sBhc30ؚQ4 -NVϑf[b:g5u] zf[b Ym_l mg]310018 Xd : [Rppv)n^c6RǏ zۏLNxvz cQNyc6R|~vo0 lxNel0lxN NNPLC:N8h_ Ǒ(uV/FlbchVTPLCvؚpeR[sNA/Dlbc, v^)R(uPLCv[ehVNu [6RsSPWM lb_fNND/A!jWW0oN NǑ(uRkbTvelOcks-)n^f~ %_eN8^ĉPID{lv:w [sN)n^v핯sc6R0MNON|~b,g [sN1%vc6R|^ nN|~c6RBl0 sQ.͋: V/Flbc; PWM; PID{l; RkbT -NVR{|S: TM571.61 e.sh_xB Design of temperature curve control system of heating furnace based on PLC Wei Yanhong1 ,Xu Chang2 ,Wang Guirong3,Gao Yanfeng4 (College of Mechanical & Electrical Engineering , China Jiliang University , Hangzhou 310018 ) Abstract: Based on the research of control process of the heating furnace ,the composition structure ,the work principle and the soft design of control system for heating furnace are introduced briefly. In the system,the frequency signal is gotten from V/F converter used as an A/D (Analog and Digital) converter, and then it is sent to high-speed counter of PLC to measure the temperature of heating furnace. The PWM (Pulse Width Modulation) curve produced by PLC are used to control the temperature of heating furnace as a D/A(Digital and Analog) converter.In the software design, the PID algorithm is applied to form a closed-loop control. Furthermore, the piecewise fitting method is used to make up for the defects of conventional PID algorithm by modifying the curve of frequency and temperature .Experimental results show that these method reduce the cost of control system via replacing expensive analog A/D module and D/A module ,and also obtain better steady-state accuracy1% and dynamic characteristics Keywords: The V/F converter ; Pulse Width Modulation; PID algorithm; piecewise fitting 0_ ]NuN-N )n^c6R8^/f\vQc6R(W@bvVQ 6qT[]NۏLR]NYt0)n^c6RǏ zwQ g^~'`0baeS0~nTvyrp08^(uRppv)n^c6R NN[evKmϑ)n^ N9hnc]zBlvSS Ne[)n^ۏLc6R b_byr[v)n^c6Rf~[1]0 )n^c6RvlxN~beHh g1 Ǒ(uUSGr:g0ARM0DSP0FPGAI{Gr~bv|~ vQbr^pbR1_0 z^[fэޘ0|~GS~ NeO ^k'Y _ShTg N[|~v~bNXTBlkؚ[2][3][4]02 Ǒ(uS z;c6RhV{yPLC ۏL)n^c6R )R(uPLC0!jbeQ!jWW{yA/D !jWW0!jbQ!jWW{yD/A!jWW g^c6R|~ Ǒ(u P L CQnv P I DcN[sN)n^v핯sc6R[5] [6]0ُyel3z`|^ؚ0br^pb'`:_ FO/fA/D!jWW0D/A!jWWvb,gؚ0 ~TQ NV } bNcQNNyevlxNeHh0Ǒ(u5uS/ssSV/FlbchVegNfA/D!jWW0)R(uLM331 Ɩb5u[s V/FSbc v^)R(u PLCؚpevR[sA/Dlbc0 Te)R(uPLCNuwQ gSS`SzzkvpeW[ Q c6RV`~5uhV _0RE^^SSvs^GW5uS SNND/A!jWWvR[7][8]0勹elǏfbcf5vA/D!jWW0D/A!jWW Q\Nc6R|~vb,g0 1c6R|~W,g~bSlxN Rpp)n^c6R|~W,ggbYVl@b:y [1u NMO:g0FX2N|RPLC0V/FlbchV0Rpp0PT100 OahVS>e'Y5uI{6*NR~b0  V1 |~W,g~b Fig.1 Configuration of system Rpp)n^c6R[sǏ zY NHQPT100 OahVS>e'Y5u\Rppv)n^lS:N5uSOS O~V/FlbchV V/FlbchV\vQlbcbsOS S0RPLCvؚpehV0ǏPLC z [seQ5uSvKmϑ _S_MRvp)ne'Y5uǑ(ueh_cl V2  EMBED Equation.DSMT4   EMBED Equation.DSMT4  1 vQ-NR:NPT100v;

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