汽车理论动力性燃油经济性计算Word文档下载推荐.docx
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3.2
空气阻力系数*迎风面积/m2
2.77
质心距前轴距离a(满载)/m
1.947
主减速器传动比
5.83
质心高
(满载)/m
0.9
变速器速比
1档
2档
3档
4档
五档变速器
5.56
2.769
1.644
1.0
0.793
拟合公式系数
(r/min)
B0
B1
B2
B3
B4
815
1326.8
-416.46
72.379
-5.8629
0.17768
1207
1354.7
-303.98
36.657
-2.0553
0.043072
1614
1284.4
-189.75
14.524
-0.51184
0.006816
2012
1122.9
-121.59
7.0035
-0.18517
0.001855
2603
1141.0
-98.893
4.4763
-0.091077
0.000689
3006
1051.2
-73.714
2.8593
-0.05138
0.000350
3403
1233.9
-84.478
2.9788
-0.047449
0.000282
3804
1129.7
-45.291
0.71113
-0.000752
-0.0000385
4200
1055.6
-40.312
0.52431
-0.000372
-0.0000102
1、绘制功率平衡图:
根据公式
,将各参数代入公式得发动机转速对应的车速;
根据负荷特性曲线的拟合公式可以得到转矩;
,计算功率;
1档数值:
n/(r/min)
/(km/h)
(N.m)
(kw)
3.564
131.8814
11.2548
5.278
159.7831
20.1946
7.058
172.0644
29.0798
8.798
174.9811
36.8651
11.383
172.7493
47.0855
13.145
169.7246
53.4233
14.881
164.8878
58.7553
16.635
154.9041
61.7021
18.367
134.5392
59.1691
MATLAB程序:
车速:
n=[081512071614201226033006340338044200];
y=0.00437306*n
转矩:
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^-1240.875*10^-9-0.0001654410.29528-19.3130];
P=polyval(p,n)/9550
一档的功率特性图:
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,:
),values(2,:
),'
g'
);
2档数值:
7.1564
10.5985
14.1723
17.6671
22.8566
26.3953
29.8813
33.4024
36.8797
y=0.008780872772*n
二档的功率特性图:
a=[07.156410.598514.172317.667122.856626.395329.881333.402436.8797];
3档数值:
12.0536
17.8511
23.8705
29.7586
38.4975
44.4578
50.3293
56.2599
62.1167
y=0.014789681*n
三档的功率特性图:
a=[012.053617.851123.870529.756838.497544.457850.329356.259962.1167];
4档数值:
19.8161
29.3473
39.2432
48.9202
63.2900
73.0886
82.7413
92.4914
102.1198
y=0.024314236*n
四档的功率特性图:
a=[019.816129.347339.243248.920263.290073.088682.741392.4914102.1198];
5档数值:
24.9888
37.0079
49.4870
61.6901
79.8108
92.1672
104.3397
116.6347
128.7765
y=0.030661079*n
五档的功率特性图:
a=[024.988837.007949.487061.690179.810892.1672104.3397116.6347128.7765];
holdon
gridon
6、阻力功率:
根据公式阻力功率=
MATLAB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)
阻力功率图:
b=[02.67455.14119.160815.002028.167340.910956.996077.2747101.7423];
values=spcrv([[a
(1)aa(end)];
汽车功率平衡图如下:
2、绘制最高档和次高档的等速百公里油耗线。
(1)、最高档的参数值:
根据燃油消耗率的特性拟合公式:
计算燃油消耗率;
再根据公式
计算百公里燃油消耗量;
b/(g/kw.h)
Q/(L/100km)
300.4106
18.9500
402.1111
30.7318
336.3013
27.6813
308.3465
25.8072
288.0694
23.8026
293.2541
23.8067
293.7939
23.1708
306.8219
22.7331
303.7998
19.5500
a=[24.988837.007949.487061.690179.810892.1672104.3397116.6347128.7765];
b=[18.950030.731827.681325.807223.802623.806723.170822.733119.5500];
(2)次高档的参数值:
23.8966
38.7538
34.9026
32.5438
30.0159
30.0211
29.2193
28.6673
24.6532
a=[19.816129.347339.243248.920263.290073.088682.741392.4914102.1198];
b=[23.896638.753834.902632.543830.015930.021129.219328.667324.6532];
r'
得到百公里燃油消耗量曲线: