An Open Access Journal
Table 9 Notation and symbols
From: A proposal for an operating cycle description format for road transport missions
Symbol | Explanation |
|---|---|
A, a i | Action matrix |
A f | Vehicle frontal area |
C | Degree of unevenness (OC sub-parameter) |
C1, C2 | Constants in speed bump associated speed function |
C d | Drag coefficient |
CI | Cone index (OC sub-parameter) |
F air | Air resistance force |
F b | Brake force |
F grade | Slope (resistance) force |
F inertia | (Fictive) force due to inertia |
F prop | Propulsion force at the wheels |
F res | Resistive force |
F roll | Rolling resistance force |
G t | (Ground) type (OC sub-parameter) |
M, m i | Mission matrix |
P, P i , P ij | Specified parameter values |
P aux | Auxiliary power |
P in | Available charging power (OC-parameter) |
P prop | Propulsion power at the wheels |
P PTO | Power take-off (OC-parameter) |
T | Ambient temperature (OC-parameter) |
T, T i | Times when p is specified |
T b | Brake torque |
\(T_{b}^{max}\) | Maximum brake torque |
T e | Engine torque |
\(T_{e}^{max}\) | Maximum engine torque |
T N+1 | Mission event end time |
T req | Requested engine torque |
T w | Wheel torque |
\(V_{b},\, V_{b}^{min}\) | Desired speed when traversing a speed bump |
X,X i | Positions where p is specified |
a p | Normalised accelerator pedal position |
a x , a y | Longitudinal and lateral acceleration |
ax0, ay0 | Longitudinal and lateral acceleration limits |
b p | Normalised brake pedal position |
d max | Stop zone distance |
d s | Distance to next stop |
e d | Intended travel direction (OC-parameter) |
f q , f T | Fuel map and torque map functions |
f r | Rolling resistance coefficient |
g | Gravitational acceleration |
h | Height of speed bump (OC sub-parameter) |
i FD , i g | Final drive and gearbox gear ratio |
k t | Traffic density (OC-parameter) |
l | Length of speed bump (OC sub-parameter) |
m | Total mass (GCW) |
\(\dot {m}_{f}\) | Fuel mass flow rate |
m c | Mass of cargo (OC-parameter) |
m v | Kerb mass |
p | A generic operating cycle parameter |
p air | Atmospheric pressure (OC-parameter) |
q | Mass of fuel injected every engine stroke |
r | Wheel radius |
s | Arc length |
t | Time |
t s | Standstill duration (OC sub-parameter) |
v | Longitudinal vehicle velocity |
v b | Associated speed of speed bumps |
v p | Associated maximum speed of p |
\(v_{p}^{\prime }\) | Predicted maximum speed of p |
v r | Relative speed between wind and vehicle |
v rev | Maximum speed when reversing |
v sign | Speed from speed sign (OC-parameter) |
v stop | Associated speed of the stop entries |
v w | Wind velocity (OC-parameter) |
v want | The speed desired by the driver interpretation |
v κ | Associated speed of the curvature |
w | Waviness (OC sub-parameter) |
x | Longitudinal position |
x s | Segmented longitudinal position |
z | Vertical position |
| The set of parameters in the mission category |
| The set of parameters in the OC-format |
| The set of parameters in the road category |
| The set of parameters in the traffic category |
| The set of parameters in the weather category |
α | Speed bump deflection angle (OC sub-parameter) |
γ | Fuel conversion proportionality constant |
η T | Overall (torque) transmission efficiency |
θ | Angle of inclination |
κ | Curvature (OC-parameter) |
λ | GPS-longitude (OC-parameter) |
ρ | Air density |
φ | GPS-latitude (OC-parameter) |
ϕ RH | Relative humidity (OC-parameter) |
ω e | Engine speed |
