Numerical study of the effects of driving patterns on energy flow and fuel consumption in parallel hybrid electric vehicles

• Electrification and hybridization constitute an expanding paradigm shift in transportationindustry towards creation of more efficient alternative propulsion systems. The change isdriven by environmental and market objectives to minimize pollutant emissions and reducefossil fuel dependence. Nonetheless, the additional complexity of electrified powertrainsbrings a challenge to derive city and highway fuel consumption estimates. The present workanalyzes the role of different driving patterns on energy flow and fuel consumption in aparallel hybrid electric vehicle (HEV) by employing vehicle powertrain simulations. Thecomputational study considers five standard drive cycles representing various trafficconditions and driving styles. The investigation is performed to understand and quantify theeffect of drive cycle dynamics on vehicle energy use, fuel consumption, and kinetic energyrecuperation through regenerative braking. The results show that a parallel HEV is moreefficient in city driving conditions compared to the highway driving. Decreased fuelconsumption is due to the usage of the electric motor, which is more efficient in frequentstart-and-stop traffic conditions as the braking energy is recaptured and stored in the battery.The amount of energy recovered by regenerative braking correlates with vehicle inertiawheel work across drive cycles. The internal combustion engine (ICE) is clearly the mainparameter affecting vehicle fuel consumption. The impact of the engine operation ischaracterized by analyzing engine usage duration and engine energy losses. The observationsand assessments presented herein are useful inputs for further optimization studies onimproving the robustness of optimized vehicle design that is greatly influenced by drivecycle characteristics.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Farkostteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Vehicle Engineering (hsv//eng)

Nyckelord

vehicle simulation

parallel HEV

energy recuperation

drive cycle dynamics

fuel consumption

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