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A Method to Calculate the Energy Impact of Interactions between Vehicle Subsystems
Technical Paper
2019-01-5036
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
Automotive Technical Papers
Language:
English
Abstract
In connection with the increasing energy and environment challenges, the
automotive industry has been investing heavily on improving the energy
efficiency of vehicles. Although the electrification of powertrain is the
principal path towards reducing fossil fuel dependency, a greater understanding
of the fuel energy utilisation on the vehicle (here intended as a ‘system’) is
necessary to identify the readily available opportunities for efficiency
improvements and ultimately develop cars which are more energy efficient. The
energy efficiency or loss map of a vehicle’s components is often obtained
experimentally from test rigs. The impact of any change in the efficiency or
loss maps of a component on the other components of the vehicle and the total
energy losses should be examined in the vehicle system level. In this article, a
systematic approach is used to study the interrelation between the component
losses and the total vehicle energy loss. A new method is proposed to determine
a component energy loss due to its position in the energy flow from the energy
source (the battery or fuel tank) to the energy sink (the energy demanded at the
wheels). The method calculates the energy impact, the interaction energy effect
of the vehicle’s components. It is shown that the components have no control
over the portion of their losses related to inefficiencies of other components
and also can benefit unreservedly from any improvement/loss reduction of other
components. The new method is implemented to set and cascade the vehicle energy
target to the components in order to drive accountability for energy consumption
into subsystems/components.
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Citation
Tourani, A., Howe, M., and Bailey, A., "A Method to Calculate the Energy Impact of Interactions between Vehicle Subsystems," SAE Technical Paper 2019-01-5036, 2019, https://doi.org/10.4271/2019-01-5036.Data Sets - Support Documents
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