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RESEARCH HYBRID DRIVES

7.0
US06
WLTP
D segment
Fuel consumption B S [l/100km] 5.0 NEDC B segment Hybrid potentials
6.0
C segment

Mode
4.0
Cycle
WLTP
B
Segment NEDC Potential [%] US06
C
C
D
C
Recuperation 22.6 16.4 20.8 24.6 21.9
LPS 1.3 0.0 0.0 0.8 0.0
3.0
10 12 14 16 18 20 FIGURE 5 Hybridisation potentials for various vehicle
Mechanical ICE energy E [kWh/100km] segments and driving cycles (NEDC = black dotted
line, WLTP = solid lines (red, black and blue) and
ICE
US06 = black dashed line) (© TU Braunschweig)
100
Potential through intelligent discharging: ≈ 3 %
GOCS
80
Extended potential
through prediction ≈ 4 to 9 %
60
SOC [%]
40 ECMS

20
SOC min
0
0 2000 4000 6000 8000
FIGURE 6 Consumption potentials through
Time [s]
intelligent discharging and predictive functions
(© TU Braunschweig)

pure battery operation due to missing cycle information, the GOCS with a modular simulation model as in [3], which is developed for
can operate the ICE or FC more efficiently through intelligent dis- the evaluation of drivetrains particularly created by powertrain syn-
charging of the battery. Thus, significant advantages in energy thesis. This combination makes it possible to develop, evaluate
consumption of approximately 3 % can be achieved depending on and optimise a large variety of hybrid concepts, as in [3-5].
the scenario, FIGURE 6. Moreover, by exploiting the SOC limits, fur-
ther consumption reduction can be realised. In the considered
scenario of [2], the extended potential is up to 9 %. REFERENCES
[1] Lange, A.; Küçükay, F.: A new, systematic approach to determine the global
energy optimum of a hybrid vehicle. In: Automotive and Engine Technology 1
8 SUMMARY AND OUTLOOK (2016), pp. 35-46
[2] Lange, A.; Küçükay, F.: Potentials of predictive control strategies. 6 th CoFAT,
At the Institute of Automotive Engineering of the TU Braunschweig Fürstenfeldbruck, 2017
[3] Lange, A.; Li, L.; Küçükay, F.: Evaluation and optimization of innovative
a new operation strategy method was developed, which is used to hybrid drives. 5 th CoFAT, Fürstenfeldbruck, 2016
determine the global energy optimum for any hybrid drive. Due to [4] Küçükay, F.; Lange, A.; Li, L.: Highly fuel-efficient transmission and propulsion
the systematic of the Global Optimal Control Strategy (GOCS), the concepts. Der Antrieb von morgen 2017, 11. internationale MTZ-Fachtagung
potentials of the various hybrid modes can be isolated and evalu- Zukunftsantriebe, 2017
[5] Lange, A.; Li, L.; Küçükay, F.: Modular DHT – a modular concept for electrified
ated. The control strategy is applied to various case studies and powertrains. 14. Braunschweiger Symposium: Hybrid- und Elektrofahrzeuge,
hybrid potentials are quantified. The GOCS is used in combination Braunschweig, 2017
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