汽車理論動力性,燃油經(jīng)濟性計算

1、期中試題動力性燃油經(jīng)濟性計算整車參數(shù)表參數(shù)值參數(shù)參數(shù)值裝載質(zhì)量/kg1990飛輪轉(zhuǎn)動慣量If/(kg.m2)0.218整車整備質(zhì)量/kg1890二前輪轉(zhuǎn)動慣量IJw1(kg.m2)1.798車輪半徑/m0.367四后輪轉(zhuǎn)動慣量I2/w2(kg.m2)3.598傳動系機械效率nt0.85變速器5檔滾動阻力系數(shù)f0.013軸距L/m3.2空氣阻力系數(shù)*迎風面積/m22.77質(zhì)心距前軸距離a(滿載)/m1.947主減速器傳動比i05.83質(zhì)心圖hg(滿載)/m0.9變速器速比1檔2檔3檔4檔5檔五檔變速器5.562.7691.6441.00.793擬合公式系數(shù)(r/min)B0B1B2B3B4815

2、1326.8-416.4672.379-5.86290.1776812071354.7-303.9836.657-2.05530.04307216141284.4-189.7514.524-0.511840.00681620121122.9-121.597.0035-0.185170.00185526031141.0-98.8934.4763-0.0910770.00068930061051.2-73.7142.8593-0.051380.00035034031233.9-84.4782.9788-0.0474490.00028238041129.7-45.2910.71113-0.00075

3、2-0.000038542001055.6-40.3120.52431-0.000372-0.00001021、繪制功率平衡圖：根據(jù)公式ua=0.377也，將各參數(shù)代入公式得發(fā)動機轉(zhuǎn)速對應(yīng)的車速;Igl0根據(jù)負荷特性曲線的擬合公式可以得到轉(zhuǎn)矩;根據(jù)公式丫募，計算功率；1檔數(shù)值:n/(r/min)ua/(km/h)Ttq(N.m)Pe"W)00008153.564131.881411.254812075.278159.783120.194616147.058172.064429.079820128.798174.981136.8651260311.383172.749347.08553

4、00613.145169.724653.4233340314.881164.887858.7553380416.635154.904161.7021420018.367134.539259.1691MATLAB程序：車速：n=081512071614201226033006340338044200;y=0.00437306*n轉(zhuǎn)矩：p=-3.844540.875-165.441295.28-19.313;>>n=00.8151.2071.6142.0122.6033.0063.4033.8044.200;>>T=polyval(p,n)功率：p=-3.8445*10八-

5、1240.875*10八-9-0.0001654410.29528-19.3130;n=081512071614201226033006340338044200;P=polyval(p,n)/9550一檔的功率特性圖：a=03.56405.27837.05818.798611.383113.145414.881516.635118.3669;b=011.254820.194629.079836.865147.085553.423358.755361.702159.1691;values=spcrv(a(1)aa(end);b(1)bb(end),3);plot(values(1,:),valu

6、es(2,:),'g');2檔數(shù)值：n/(r/min)Ua/(km/h)Ttq(N.m)Pe"W)0008157.1564131.881411.2548120710.5985159.783120.1946161414.1723172.064429.0798201217.6671174.981136.8651260322.8566172.749347.0855300626.3953169.724653.4233340329.8813164.887858.7553380433.4024154.904161.7021420036.8797134.539259.1691MAT

7、LAB程序：車速：n=081512071614201226033006340338044200;y=0.008780872772*n轉(zhuǎn)矩：p=-3.844540.875-165.441295.28-19.313;> >n=00.8151.2071.6142.0122.6033.0063.4033.8044.200;> >T=polyval(p,n)功率：p=-3.8445*10八-1240.875*10=-9-0.0001654410.29528-19.3130;n=081512071614201226033006340338044200;P=polyval(p,n)/

8、9550二檔的功率特性圖：a=07.156410.598514.172317.667122.856626.395329.881333.402436.8797;b=011.254820.194629.079836.865147.085553.423358.755361.702159.1691;values=spcrv(a(1)aa(end);b(1)bb(end),3);plot(values(1,:),values(2,:),'g');3檔數(shù)值：n/(r/min)ua/(km/h)Ttq(N.m)Pe(kw)00081512.0536131.881411.2548120717.

9、8511159.783120.1946161423.8705172.064429.0798201229.7586174.981136.8651260338.4975172.749347.0855300644.4578169.724653.4233340350.3293164.887858.7553380456.2599154.904161.7021420062.1167134.539259.1691MATLAB程序：車速：n=081512071614201226033006340338044200;y=0.014789681*n轉(zhuǎn)矩：p=-3.844540.875-165.441295.28-

10、19.313;> >n=00.8151.2071.6142.0122.6033.0063.4033.8044.200;> >T=polyval(p,n)功率：p=-3.8445*10八-1240.875*10=-9-0.0001654410.29528-19.3130;n=081512071614201226033006340338044200;P=polyval(p,n)/9550三檔的功率特性圖：a=012.053617.851123.870529.756838.497544.457850.329356.259962.1167;b=011.254820.194629

11、.079836.865147.085553.423358.755361.702159.1691;values=spcrv(a(1)aa(end);b(1)bb(end),3);plot(values(1,:),values(2,:),'g');4檔數(shù)值：n/(r/min)ua/(km/h)Ttq(N.m)PeW)00081519.8161131.881411.2548120729.3473159.783120.1946161439.2432172.064429.0798201248.9202174.981136.8651260363.2900172.749347.0855300

12、673.0886169.724653.4233340382.7413164.887858.7553380492.4914154.904161.70214200102.1198134.539259.1691MATLAB程序：車速：n=081512071614201226033006340338044200;y=0.024314236*n轉(zhuǎn)矩:p=-3.844540.875-165.441295.28-19.313;>>n=00.8151.2071.6142.0122.6033.0063.4033.8044.200;>>T=polyval(p,n)功率：p=-3.8445*

13、10八-1240.875*10=-9-0.0001654410.29528-19.3130;n=081512071614201226033006340338044200;P=polyval(p,n)/9550四檔的功率特性圖：a=019.816129.347339.243248.920263.290073.088682.741392.4914102.1198;b=011.254820.194629.079836.865147.085553.423358.755361.702159.1691;values=spcrv(a(1)aa(end);b(1)bb(end),3);plot(values(

14、1,:),values(2,:),'g');5檔數(shù)值：n/(r/min)Ua/(km/h)Ttq(N.m)Pe(kw)00081524.9888131.881411.2548120737.0079159.783120.1946161449.4870172.064429.0798201261.6901174.981136.8651260379.8108172.749347.0855300692.1672169.724653.42333403104.3397164.887858.75533804116.6347154.904161.70214200128.7765134.53925

15、9.1691MATLAB程序：車速：n=081512071614201226033006340338044200;y=0.030661079*n轉(zhuǎn)矩：p=-3.844540.875-165.441295.28-19.313;>>n=00.8151.2071.6142.0122.6033.0063.4033.8044.200;>>T=polyval(p,n)功率：p=-3.8445*10八-1240.875*10=-9-0.0001654410.29528-19.3130;n=081512071614201226033006340338044200;P=polyval(p

16、,n)/9550五檔的功率特性圖：a=024.988837.007949.487061.690179.810892.1672104.3397116.6347128.7765;b=011.254820.194629.079836.865147.085553.423358.755361.702159.1691;values=spcrv(a(1)aa(end);b(1)bb(end),3);plot(values(1,:),values(2,:),'g');holdongridon6、阻力功率：3GfuaCDAuaaDa根據(jù)公式阻力功率=PLw=3600761400.85tMATLA

17、B程序求阻力功率y=0.000042800.08030;>>u=024.988837.007949.487061.690179.810892.1672104.3397116.6347128.7765;>>p=polyval(y,u)阻力功率圖：a=024.988837.007949.487061.690179.810892.1672104.3397116.6347128.7765;>>b=02.67455.14119.160815.002028.167340.910956.996077.2747101.7423;>>values=spcrv(a(

18、1)aa(end);b(1)bb(end),3);plot(values(1,:),values(2,:),'g');汽車功率平衡圖如下：2、繪制最高檔和次高檔的等速百公里油耗線(1)、最高檔的參數(shù)值：根據(jù)燃油消耗率的特性擬合公式：_2_3_4b=BoBiPeB2PeB3PeB'R計算燃油消耗率；計算百公里燃油消耗量；再根據(jù)公式n/(r/min)Ua/(km/h)b/(g/kw.h)Q/(L/100km)Pe(kw)001326.800-PebQ二e1.02Ua：g81524.9888300.410618.950011.2548120737.0079402.111130

19、.731820.1946161449.4870336.301327.681329.0798201261.6901308.346525.807236.8651260379.8108288.069423.802647.0855300692.1672293.254123.806753.42333403104.3397293.793923.170858.75533804116.6347306.821922.733161.70214200128.7765303.799819.550059.1691MATLAB程序：a=24.988837.007949.487061.690179.810892.1672104.3397116.6347128.7765;> >b=18.950030.731827.681325.807223.802623.806723.170822.733119.5500;> >values=spcrv(a(1)aa(end);b(1)bb(end),3);plot(values(1,:),values(2,:),'g');(2)次高檔的參數(shù)值：n/(r/min)ua/(km/h)b/(g/kw.h)Q/(L/100km)Pe(kw)001326.80081519.81613