Hybrid-on-demand Driveline

The basic approach of the HoD-concept is depicted in the figure below. The trucks/tractors are equipped with a state-of-the-art mechanical driveline including a combustion engine and a gearbox. This driveline is controlled by OEM-specific Vehicle Control Units (VCU). In contrast to existing concepts, the hybrid driveline is not placed within the truck/tractor. Instead the HoD driveline concept puts the electric driveline into the (semi)trailers. 
Therefore, (semi)trailers will be equipped with an electric driveline consisting of electric motors/generators (EMG), modular energy storage units (e.g. battery packs installed in so called Energy Bays) and a Trailer Driveline Management System (TDMS). Connecting such a (semi)trailer with slightly modified conventional trucks results in a truck-(semi)trailer combination, with a fully functional distributed modular hybrid driveline that provides an internal approach for mission based rightsizing. For the first time the HoD driveline.

Hybrid on Demand



Hybrid-on-demand Framework

To enable a rapid and high market penetration of hybrid truck-(semi)trailer vehicles in the medium term (2020-2030), the Hybrid-on-Demand (HoD) driveline concept should not only be applicable to virtually any kind of truck-(semi)trailer vehicle but needs an industrial standard as well. This standard has to ensure compatibility and interoperability of different trucks/tractors and trailers/semitrailers. Thus it would provide planning certainty for future RTD activities. This planning certainly is very important not only for large enterprises but also for SMEs.

Within this project, the so called electric Hybrid-on-Demand framework will be developed as an open pre-standard for the Hybrid-on-Demand driveline concept described above. Pre-standard means that the developed framework will be the basis for a subsequent industrial standardisation process.

The main components of the proposed Hybrid-on-Demand framework are shown in the figure below. The Trailer Driveline Management System (TDMS) located in the trailer/semitrailer plays a key role within the new approach. This module provides reliable interfaces not only for Vehicle Energy Management Systems (VEMS) of trucks/tractors but also for Energy Storage Units (ESU Interface) and Electric Motor/Generators (EMG Interface). The TDMS is coupled to the Vehicle Energy Management System (VEMS) located in the truck/tractor which calculates the most energy-efficient management strategy for the whole driveline, resulting in power requests for the truck/tractor driveline via VCU interface and for the trailer driveline via TDMS interface.The framework defines the common functionality of each control unit and hence delivers a pre-standard for ECU manufacturers. Furthermore the framework includes necessary pre-standards for mechanic, electric and data interfaces between driveline and management components.





HoD Trailer awarded [SCB]
TRANSFORMERS Final Conference


Facts & Figures

  • Full name: Configurable and Adaptable Trucks and Trailers for Optimal Transport Efficiency
  • Duration: 4 years
  • Start date: 1 September 2013
  • Total budget: 7.9 M€
  • EC Funding: 5.2 M€


  • Develop and demonstrate Hybrid-on-Demand Driveline for Truck-trailer Combination
  • Develop innovative complete vehicle aerodynamic measures
  • Develop innovative loading efficiency measures