汽車爬坡度計(jì)算

1、爬坡度計(jì)算計(jì)算方法一：根據(jù)汽車?yán)碚?，坡度角?jì)算公式為：=arcsinFt-(Ff+Fw)/G式中-坡度角，°Ft-各檔最大驅(qū)動(dòng)力，NFf-滾動(dòng)阻力，NFw-空氣阻力，NG-汽車總質(zhì)量，N下面分別討論式中各項(xiàng)：1、 各檔最大驅(qū)動(dòng)力Ft本處只計(jì)算最低檔Ft =Me*ig*i0*T/r式中Me-發(fā)動(dòng)機(jī)扭矩，Nm，對(duì)WD615發(fā)動(dòng)機(jī)為：1100266PS、1160290PS、1350336PS1460371PS、1650410PSig-變速器各檔速比8JS100B I檔 11.4-266PS車型9JS119 I檔 12.11-290PS車型RT11509C 爬行檔 12.42-336、371

2、、420PS車型12JS160T I檔 15.5316JS180T I檔 17.045S111GP 爬行檔 13.045S150GP 爬行檔 13.04i0-主減速器速比ST16HC16、鑄鋼 6.72，5.73，4.8，4.42HW12 5.833，4.875HW16 4.22，3.73注：計(jì)算時(shí)，公路車根本型按4.42，工程車根本型按5.73T-傳動(dòng)系統(tǒng)總效率變速器 90%，主減速器ST16HC1692%，HW12HW1696%傳動(dòng)軸 96%注：為簡(jiǎn)化計(jì)算，按平均兩根計(jì)算故T=0.9*0.96*0.96=0.83r-車輪滾動(dòng)半徑，m11.20-20 0.525；12.20-20 0.540

3、注：計(jì)算時(shí)按根本型12.00-20輪胎。由此計(jì)算出驅(qū)動(dòng)力Ft =85193N-266PS公路車Ft =110442N-266PS工程車Ft =90498N-290PS公路車Ft =117321N-290PS工程車Ft =113910N-336PS公路車Ft =147670N-336PS工程車Ft =123191N-371PS公路車Ft =159703N-371PS工程車2、滾動(dòng)阻力Ff=fW式中 f-滾動(dòng)阻力系數(shù) 0.015 良好瀝青路面公路車0.022 碎石路面工程車W-車輛對(duì)路面的正壓力，N，即滿載狀態(tài)下整車總重7300+34500*9.8=409640N S35/4*29300+3950

4、0*9.8=478240N S29/6*425000*9.8=245000N O、B、K/6*431000*9.8=303800N O、B、K/8*4注：計(jì)算時(shí)，未考慮載貨車O拖掛。由此，計(jì)算出滾動(dòng)阻力6144.6N S35/4*27173.6N S29/6*43675N O /6*45390N B、K/6*44557N O /8*46684N B、K/8*43、空氣阻力Fw=CDAVa2/21.15式中CD-空氣阻力系數(shù)，卡車按0.9 A-迎風(fēng)面積，m2，豪運(yùn)車約為7.5 m2Va-行駛速度，km/h，按30 km/h4、汽車總質(zhì)量G見(jiàn)第二條W的計(jì)算。5、最大坡度角，爬坡度i=tgmax=a

5、rcsinFt-(Ff+Fw)/G計(jì)算結(jié)果如下表；FtNFfNFwNGNmax°i%S35/4*2/266PS851936144.628740964011.119.6S35/4*2/290PS904986144.611.821.0S35/4*2/336PS1139106144.615.227.2S35/4*2/371PS1231916144.616.629.7S29/6*4/266PS851937173.64782409.416.5S29/6*4/290PS904987173.610.017.6S29/6*4/336PS1139107173.612.922.8S29/6*4/371P

6、S1231917173.614.024.9O/6*4/266PS85193367524500019.435.1O/6*4/290PS90498367520.737.8O/6*4/336PS113910367526.750.2O/6*4/371PS123191367529.155.7B、K/6*4/266PS 110442539025.347.3B、K/6*4/290PS117321539027.151.2B、K/6*4/336PS147670539035.471.1B、K/6*4/371PS159703539039.080.8O/8*4/266PS85193455730380015.3427.

7、4O/8*4/290PS90498455716.3729.4O/8*4/336PS113910455721.0338.5O/8*4/371PS123191455722.9342.3B、K/8*4/266PS110442668419.9136.2B、K/8*4/290PS117321668421.3039.0B、K/8*4/336PS147670668427.5952.3B、K/8*4/371PS159703668430.1858.2計(jì)算方法二：max = arcsinDmax-f*SQRT(1- Dmax2+f2)/1+ f2式中max-最大爬坡角度，°；Dmax-最低檔動(dòng)力因數(shù)；f

8、-滾動(dòng)阻力系數(shù)0.015 良好瀝青路面公路車0.022 碎石路面工程車其中，Dmax=Ft- Fw/G式中Dmax-最低檔動(dòng)力因數(shù)；Ft-各檔最大驅(qū)動(dòng)力Ft本處只計(jì)算最低檔，N；Fw-空氣阻力，287N；G-汽車總質(zhì)量。計(jì)算如下表：Ft(N)Fw(N)G(N)fDmax max(°)I%S35/4*2/266PS851932874096400.0150.20711.1019.6S35/4*2/290PS904980.22011.8621.0S35/4*2/336PS1139100.27715.2427.2S35/4*2/371PS1231910.30016.6029.8S29/6*4

9、/266PS851934782400.1789.3716.5S29/6*4/290PS904980.18910.0117.7S29/6*4/336PS1139100.23812.8822.9S29/6*4/371PS1231910.25714.0325.0O/6*4/266PS851932450000.34719.4235.2O/6*4/290PS904980.36820.7437.9O/6*4/336PS1139100.46426.7750.4O/6*4/371PS1231910.50229.2556.0B、K/6*4/266PS1104420.0220.45025.4547.6B、K/6*4/290PS1173210.47827.2751.5B、K/6*4/336PS1476700.60235.7171.9B、K/6*4/371PS1597030.65139.3281.9O/8*4/266PS851933038000.0150.27915.3727.5O/8*4/290PS904980.29716.7129.5O/8*4/336PS1139100.37421.1038.6O/8*4/371PS1231