Evaluation of transmission losses of various Dedicated Hybrid Transmission (DHT) with a lossmap-based simulation model

Hengst, Johannes; Seidel, Tim; Lange, Andreas; Küçükay, Ferit

doi:10.1007/s41104-019-00041-1

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…The transmission module consists of mathematical description of the transmission with information about the mechanical connections, shifting elements as well as the transmission modes. The transmission efficiency is calculated by utilizing either a simplified loss approach or generated transmission loss maps [15].…”

Section: Optimal Concept Dimensioning Environmentmentioning

confidence: 99%

“…Basically, the lossmaps are generated by a detailed model whereby the transmission kinematics are defined mathematically so that the losses of all gearbox components can be calculated, e.g. the gears, bearings and seals [15]. In the [23] optimal dimensioning, the battery model is a simplified open circuit model with one resistance without thermal behavior simulation.…”

Section: Simulation Model Differencesmentioning

confidence: 99%

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Optimal and prototype dimensioning of 48V P0+P4 hybrid drivetrains

Werra

Sturm

Küçükay

2020

Automot. Engine Technol.

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This paper presents a virtual toolchain for the optimal concept and prototype dimensioning of 48 V hybrid drivetrains. First, this toolchain is used to dimension the drivetrain components for a 48 V P0+P4 hybrid which combines an electric machine in the belt drive of the internal combustion engine and a second electric machine at the rear axle. On an optimal concept level, the power and gear ratios of the electric components in the 48 V system are defined for the best fuel consumption and performance. In the second step, the optimal P0+P4 drivetrain is simulated with a prototype model using a realistic rule-based operating strategy to determine realistic behavior in legal cycles and customer operation. The optimal variant shows a fuel consumption reduction in the Worldwide harmonized Light Duty Test Cycle of 13.6 % compared to a conventional vehicle whereas the prototype simulation shows a relatively higher savings potential of 14.8 %. In the prototype simulation for customer operation, the 48 V hybrid drivetrain reduces the fuel consumption by up to 24.6 % in urban areas due to a high amount of launching and braking events. Extra-urban and highway areas show fuel reductions up to 11.6 % and 4.2 %, respectively due to higher vehicle speed and power requirements. The presented virtual toolchain can be used to combine optimal concept dimensioning with close to reality behaviour simulations to maximise realistic statements and minimize time effort.

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Section: Optimal Concept Dimensioning Environmentmentioning

confidence: 99%

Section: Simulation Model Differencesmentioning

confidence: 99%

Optimal and prototype dimensioning of 48V P0+P4 hybrid drivetrains

Werra

Sturm

Küçükay

2020

Automot. Engine Technol.

Self Cite

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TwinRex – The TwinConcept for a Serial-Parallel Hybrid System With an Excellent Cost-Value Index

Savelsberg¹,

Maiterth²,

Keizer³

et al. 2021

Proceedings

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Evaluation of Transmission Losses of Various Battery Electric Vehicles

2022

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Transmission losses in battery electric vehicles have compared to internal combustion engine powertrains a larger share in the total energy consumption and play therefore a major role. Furthermore, the power flows not only during propulsion through the transmissions, but also during recuperation, whereby efficiency improvements have a double effect. The investigation of transmission losses of electric vehicles thus plays a major role. In this paper, three simulation models of the Institute of Automotive Engineering (the lossmap-based simulation model, the modular simulation model, and the 3D simulation model) are presented. The lossmap-based simulation model calculates transmission losses for electric and hybrid transmissions, where three spur gear transmission concepts for battery electric vehicles are investigated. The transmission concepts include a single-speed transmission as a reference and two two-speed transmissions. Then, the transmission lossmaps are integrated into the modular simulation model (backward simulation) and in the 3D simulation model (forward simulation), which improves the simulation results. The modular simulation model calculates the optimal operation of the transmission concepts and the 3D simulation model represents the more realistic behavior of the transmission concepts. The different transmission concepts are investigated in Worldwide Harmonized Light Vehicle Test Cycle and evaluated in terms of transmission losses as well as the total energy demand. The map-based simulation model allows the transmission losses to be broken down into the individual component losses, thus allowing transmission concepts to be examined and evaluated in terms of their efficiency in the early development stage to develop optimum powertrains for electric axle drives. By considering transmission losses in detail with a high degree of accuracy, less efficient concepts can be eliminated at an early development stage. As a result, only relevant concepts are built as prototypes, which reduces development costs.

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Evaluation of transmission losses of various Dedicated Hybrid Transmission (DHT) with a lossmap-based simulation model

Cited by 5 publications

References 1 publication

Optimal and prototype dimensioning of 48V P0+P4 hybrid drivetrains

Optimal and prototype dimensioning of 48V P0+P4 hybrid drivetrains

TwinRex – The TwinConcept for a Serial-Parallel Hybrid System With an Excellent Cost-Value Index

Evaluation of Transmission Losses of Various Battery Electric Vehicles

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