F W ¼ F RO þ F L þ F st
ð13:3Þ
F RO ¼ fmgcosa
ð13:4Þ
F L ¼
1
2
qc W A v þ v 0
ð
Þ
2
ð13:5Þ
F st ¼ mgsina
ð13:6Þ
where
m Vehicle mass, m ¼ 1560kg;
g Gravity acceleration;
f
Rolling friction coefficient, f = 0.015;
c W Air resistance coefficient, c W ¼ 0:36;
q Air density (kg/m
3 );
A Vehicle windward area (m
2 );
v
Driving speed (m/s);
v 0 Windward speed, v 0 ¼ 3m=s;
a Climbing angle.
It can be seen from Eq. (13.5) that the faster the car travels, the greater the
air resistance and the greater the energy consumption.
3. Work and power consumed by vehicle during driving:
W ¼ F W s
ð13:7Þ
dW
dt
¼ F W v
ð13:8Þ
where
W Mechanical energy consumed by automobile driving (kJ);
s Driving distance (km).
4. Vehicle energy equilibrium equation:
kbE ¼ W
ð13:9Þ
kb
dE
dt
¼
dW
dt
ð13:10Þ
13.2 Hydrogen Transmission and Hydrogenation Characteristics …
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