Abstract
Driving cycles greatly influence the fuel economy and exhaust of the vehicle, especially in hybrid electric vehicles. The purpose of this study is to develop a method to identify the type of driving cycle with better accuracy and less sampling time than other driving cycle recognition algorithms. A driving cycle recognition algorithm based on Learning Vector Quantization neural network is first created to analyze four selected representative standard driving cycles. Micro-trip extraction and box-and-whisker plots are then applied to ensure the diversity and magnitude of training samples. Finally, a sample training simulation is conducted to determine the minimum neuron number of learning vector quantization network, using the simulation platform of Matlab/Simulink. Afterwards, we simplify the structure of the recognition model to reduce data convergence time. Simulation results show the feasibility and efficiency of the proposed algorithm, which decreases the time window length from 120 s to 60 s with acceptable accuracy. Furthermore, the driving cycle recognition algorithm is used in a series-parallel hybrid vehicle model to improve the fuel economy by about 6.29%.
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Abbreviations
- g batt :
-
electricity equivalent fuel consumption [g/h]
- H LHV :
-
diesel combustion characteristic parameters [J/g]
- n m :
-
motor speed [1/min]
- N :
-
the total number of data [—]
- η batt :
-
battery operating efficiency [100%]
- η m :
-
motor operating efficiency [100%]
- SOC :
-
battery state of charge [100%]
- SOC obj :
-
battery SOC [100%]
- s chg :
-
charging equivalent coefficient [—]
- s dis :
-
discharging equivalent coefficient [—]
- T m :
-
motor torque [Nm]
- t max :
-
the maximum time length for the specific drive cycle [s]
- t i :
-
target output [—]
- t 0 :
-
end point of a single sample [s]
- Δ t :
-
forecast period based on the current conditions [s]
- t cur :
-
current time [s]
- ΔT :
-
sample length [s]
- Δω :
-
identification cycle [s]
- y i :
-
model prediction output [—]
- β 0 :
-
random parameter [—]
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Wang, J., Wang, Q.N., Zeng, X.H. et al. Driving cycle recognition neural network algorithm based on the sliding time window for hybrid electric vehicles. Int.J Automot. Technol. 16, 685–695 (2015). https://doi.org/10.1007/s12239-015-0069-3
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DOI: https://doi.org/10.1007/s12239-015-0069-3