Abstract
Using MATLAB/Simulink, we constructed a comprehensive simulation model for the fuel cell hybrid vehicle (FCHV) power train in parallel with a power control strategy that uses a logic threshold approach implemented with a hybrid control unit (HCU). The simulation implements power flow and power distribution under different vehicle operating modes using the accelerator and decelerator pedal positions deduced from the driving schedule as primary inputs. The HCU control strategy also incorporates regenerative braking and recharging for recovery of battery capacity. Using the D-optimality method for selection of the optimal experiment values, three control threshold variables for the HCU are selected to maximize the hydrogen fuel economy under certain driving cycles. The proposed method provides the optimal configuration of the FCHV model, which has the capability of achieving the requested drive power while also meeting the vehicle driving schedule and recovery needs of the state of charge (SOC) battery, with lower fuel consumption levels.
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Abbreviations
- FCHV:
-
fuel cell hybrid vehicle
- HCU:
-
hybrid control unit
- DC/DC:
-
direct current to direct current converter
- AC:
-
alternating current
- NEDC:
-
New Europe Driving Cycle
- AP:
-
accelerator/decelerator pedal position
- SOC:
-
battery state of charge
- SOC low :
-
pre-defined low range of the SOC
- SOC up :
-
pre-defined upper range of the SOC
- SOC init :
-
initial value of the SOC
- SOC min :
-
minimum SOC value during a driving cycle
- SOC final :
-
final SOC value after a driving cycle
- P mot :
-
motor output power
- P bat :
-
power provided by the battery or transformed in the battery during regenerative braking
- P fc :
-
power provided by the fuel cell stack
- P threshold :
-
control threshold value of requested drive power
- AP threshold :
-
control threshold value of accelerator pedal position
- V threshold :
-
control threshold value of vehicle speed
- V car :
-
achievable vehicle speed
- I discharge :
-
pre-set discharge current of battery
- I recharge :
-
pre-set recharge current of battery
- T drive :
-
drive torque for vehicle dynamics before the transmission
- T available :
-
available maximum torque of the motor under the given motor rotor speed
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Ning, Q., Xuan, D. & Kim, Y. Modeling and control strategy development for fuel cell hybrid vehicles. Int.J Automot. Technol. 11, 229–238 (2010). https://doi.org/10.1007/s12239-010-0029-x
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DOI: https://doi.org/10.1007/s12239-010-0029-x