The Hybrid Commercial Vehicle (HCV) project aims to develop urban buses and delivery vehicles with advanced second generation of energy efficient hybrid electric powertrains.

Sub-Project 4000 - Hybrid bus demonstrator

The main objectives in SP4000 are to demonstrate the following improvements for the advanced second generation 18-ton hybrid bus compared to the early second generation bus:

  1. a fuel consumption in a city drive cycle at least 5% lower
  2. a weight-reduction of at least 500 kg
  3. a cost reduction of at least 40% of hybrid drivetrain components developed
  4. improved driveability and performance
  5. noise reduction

In SP4000 data from real environment usage of early second generation hybrid buses will be gathered and analyzed. This data will be input to the vehicle requirement setting process.

The powertrain will be designed with focus on integration of chassis components for improved reliability and lower cost. Energy storage system, electric drive system, a new transmission and electric auxiliaries will be developed and integrated.

Another task will be to reduce the weight of the bus to save fuel consumption and/or gain passenger capability. In the project, development of vehicle simulation models including powertrain, auxiliaries and control system will be developed.

The new hybrid powertrain will be tested in rig, including energy storage, electric motor and with simulated electrical load from auxiliaries in order to understand the total system potential. A light weight demonstrator with advanced second generation technology will be built and verified in chassis dynamometer as well as in real traffic in Göteborg, Sweden.

Involved partners and activities


  • Development and delivery of prototype motor drive system and DCDC converter
  • Focus on improved system functionality/performance and cost reduction


  • Light weight body design and chassis improvements
  • Modelling and simulation methodology for body structural integrity and durability

Magna Steyr Battery systems

  • Control system improvements
  • Development and delivery of the prototype battery system
  • Focus on the performance characteristics, reliability (abuse tolerance) and cost reduction


  • Involved in the measurement and demonstration activities, both the early 2nd generation and the adv. 2nd generation bus
  • Fuel and emission measurements, data collection and driver interviews from user perspective


  • SP and WP management
  • System evaluation and demonstration
  • Driveline and vehicle integration (development and build)
  • HEV control strategy development
  • Lighter bus body and chassis
  • Investigation of HILS type approval
Info master Last edited on 2014-11-14