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1、1 目录动力性计算参数21.1 汽车最高车速21.2 汽车最大爬坡度22 汽车的加速能力21.3.1原地起步换档加速到60km/h的时间；2计算参数22.1 发动机使用外特性23 整车参数2计算33.1 汽车各档车速33.2 驱动力33.3 空气阻力33.4 各档动力因数43.5 汽车爬坡度43.5.1 加速性能5各档加速度计算5加速度倒数5汽车加速时间计算54 作汽车的动力特性图，求出最高车速6该车的动力性能参数表71动力性计算参数1.1汽车最高车速1.2汽车最大爬坡度1.3汽车的加速能力1.3.1原地起步换档加速到60km/h的时间;2计算参数2.1发动机使用外特性表2.1.1扬动480国
2、山（油刹）发动机性能参数名称代号单位12345678910转速nr/min1300150017001900210023002500270029803050扭矩MeNm86.7792.8696.9299.1899.8699.1697.3394.5789.5688.16功率PekW11.7414.8717.6520.0722.1723.9525.4226.6027.8028.022.2整车参数表2.2.1整车参数参数单位数据满载总质量GN34500变速箱各档速比igig1ig2ig3ig4ig5R5.172.881.64510.8394.306主减速器速比io5.375车轮滚动半径Rrm0.312
3、前轮距Bm1.26汽车总高Hm1.94迎风面积Am22.444空气阻力系数CDN.S2.m40.7滚动阻力系数f0.013传动效率nt0.9旋转质量转换系数SS=1.04+0.04ig22.111.371.151.081.073计算3.1汽车各档车速V=0.377nRr/igi(km/h)各档车速值(见表3-1)。表3.1.1各档车速nIn出IVV13005.509.8817.2928.4533.9115006.3511.4019.9532.8339.1217006.7712.1621.2835.0141.7319007.6213.6823.9539.3946.9521008.4715.202
4、6.6143.7752.1723009.3116.7229.2748.1457.38250010.1618.2431.9352.5262.60270011.0119.7634.5956.9067.82298011.8521.2837.2561.2773.03305012.9123.1840.5766.7479.553.2驱动力匕讪打。t/Rr(N)各档驱动力值(见表3-2)。表3.2.1各档驱动力nFt1Ft2Ft3Ft4Ft513006955.603874.692213.151345.381128.7715007443.594146.532368.421439.771207.96170076
5、25.644247.942426.341474.981237.5119007876.834387.872506.271523.571278.2721007992.184452.122542.971545.881296.9923007989.284450.512542.041545.321296.5225007885.764392.842509.111525.291279.7227007699.224288.932449.751489.211249.4529807447.284148.582369.591440.481208.5630507067.193936.852248.651366.961
6、146.883.3空气阻力Fw二CDAV2/21.15(N)空气阻力值(见表3-3)。表3.3.1空气阻力nFw1FW2Fw3FW4FW513002.457.8924.2065.4893.0215003.2610.5132.2187.17123.8417003.7111.9636.6599.18140.9019004.7015.1346.39125.53178.3321005.8018.6857.27154.97220.1623007.0222.6169.30187.52266.3925008.3526.9082.47223.16317.0227009.8031.5896.79261.9037
7、2.06298011.3636.62112.25303.75431.51305013.4843.45133.19360.41512.003.4各档动力因数D=(Ft-Fw)/G各档动力因数(见表3-2)。表3.4.1各档动力因数nD1D2D3D4D513000.200.110.060.040.0315000.220.120.070.040.0317000.220.120.070.040.0319000.230.130.070.040.0321000.230.130.070.040.0323000.230.130.070.040.0325000.230.130.070.040.0327000.2
8、20.120.070.040.0329800.220.120.070.030.0230500.200.110.060.030.023.5汽车爬坡度I-IID1f2-D20.5-f/1-D2表3.5.1汽车爬坡度nI1I2I3I4I513000.190.100.050.020.0215000.210.110.050.030.0217000.210.110.060.030.0219000.220.110.060.030.0221000.220.120.060.030.0223000.220.120.060.030.0225000.220.110.060.020.0127000.210.110.06
9、0.020.0129800.210.110.050.020.0130500.200.100.050.020.013.6.1 3.6加速性能各档加速度计算J=gD-f/、表3.6.1各档加速度nJ1J2J3J4J513000.890.720.440.220.1615000.960.780.480.240.1717000.990.800.490.250.1819001.020.830.510.250.1821001.040.840.510.250.1723001.040.840.510.240.1625001.020.830.500.230.1427001.000.800.480.210.1229
10、800.960.770.460.180.0930500.910.730.420.150.053.6.2加速度倒数表3.6.2加速度倒数n1/J11/J21/J31/J41/J513001.121.382.284.486.2815001.041.282.104.125.8017001.011.252.044.025.6919000.981.211.973.925.6621000.971.191.943.955.8623000.971.191.964.106.3425000.981.212.004.367.1727001.001.242.084.788.5929801.041.292.195.4111.2230501.101.372.386.6819.773.6.3汽车加速时间计算t二VV21/jdv作出1/j-V曲线，用图解法求加速时间V=0,加速到V=60km/h所需加速时间V02030405060t05.9711.8317.7128.541.363.7作汽车的动力特性图，求出最咼车速Vmax二60km/hZ匸丄一丄E庄孚&R揺厠4该车的动力性能参数表41.36sV0=加速到Va=6km/h所需加速时间满载2000kg时最高车速为82.5km/h汽车最大爬坡度22%一档最大动力因数0.23直接档最大动力因数0.04
