Analysis of the Optimal Operating Strategy for a P24-Hybrid with different Electric Power Distributions in Charge-Depleting and Charge-Sustaining Operation Mercedes-Benz AG

Format:

Book

Conference/Event

Author/Creator:

Jungen, Mario, author.

Contributor:

Goerke, Daniel

Hofmann, Peter

Kimmig, Nikolai

Langwiesner, Morris

Schmiedler, Stefan

Conference Name:

15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

In order to adhere with future automotive legislation and incentive, the electric range of Plug-In hybrids has steadily increased. At the same time the installed electric power has risen as well. With future hybrid configurations with an electric power share of more than half of overall system power, concepts of hybrid vehicles with at least two electrical machines come into focus. The concept of adding an individual electrical axle to a modern parallel hybrid, such as a P2-hybrid, is of special interest. However, the system complexity of a so called P24-hybird increases significantly as the number of possible system states increases. Thus, this paper analyzes the efficiencies and benefits of the different system states of a P24-hybrid within the fuel-optimal operating strategy derived by global optimization. By varying the electrical power distribution between the two axles the impacts on fuel efficiency and changes within the operating strategy are investigated. Due to the higher system complexity, the control and calibration effort for a P24-hybrid is highly increased. Thus, the efficiency advantages of different system states are evaluated in order to identify possible driving situations where a less complex calibration might be feasible without compromising too much efficiency potential. The analysis within this paper shows that the use of an individual electrical axle improves the overall system efficiency of the hybrid system. That charging the battery during hybrid operation is more fuel efficient in parallel than in series operation in almost all situations. And that an electrical power distribution shifted towards the all-electrical axle is beneficial regarding fuel efficiency and stability of the operating strategy. Furthermore, by analyzing the fuel-optimal operating strategy within different driving profiles, the predominant distribution of load points of the internal combustion engine is identified from which one can conclude the most relevant areas for further engine improvements

Notes:

Vendor supplied data

Publisher Number:

2021-24-0108

Access Restriction:

Restricted for use by site license