Skip to main content

Reduction of Parasitic Losses

Many conventional systems within vehicles offer renewed opportunities for reducing parasitic energy wastage, namely through driveline and transmission (friction reduction through fast warm up, bearing and bearing surface technologies and advanced lubricants), and chassis (reduced rolling resistance through low rolling resistance tyres, steering/suspension geometry, low drag brake callipers, electric power steering). However there is room for improvement in these areas.


Achievements include:
  • A fully correlated, integrated CAE model that can simulate parasitic losses at vehicle, subsystem and component level
  • A sensitivity study approach to identify the major systems and components contributing to parasitic losses for both a convention internal combustion and electrically powered passenger car 
  • A comprehensive meta-study of research into parasitic loss reducing technologies 
  • Evaluation of a number of production feasible parasitic loss reducing technologies using the simulation model. The study demonstrated that the cumulative improvements to the gearbox, driveline, tyres and low voltage electrical system are comparable to those that could be realised through aerodynamic improvements alone
  • Gearbox and low voltage electrical efficiency measurements to assist with simulation model validation


Business Impact – New Products and Processes
The project partners have jointly developed a new analytical tool for predicting fuel economy and electric vehicle range which can also identify the relative efficiency and loss contribution of individual components and systems. This enables advanced lower friction and electrical energy technologies to be evaluated using simulation tools instead of the more traditional and costly testing route. The energy flows and losses can be easily be mapped and the model adapted for a variety of vehicle and powertrain configurations.

Coventry University, along with Jaguar Land Rover and Ricardo, has conducted benchmarking of low voltage electrical loads on a suite of recent EV and hybrid vehicles against similar conventional vehicles. The University has supported detailed simulation of the efficiency sensitivity to the power demands of the low voltage electrical system. The work has led to a greater understanding of low voltage systems and their overall impact on vehicle efficiency, enhancing Coventry University’s capability to further investigate and develop technologies identified as a means to improve low carbon vehicles.

The parasitic loss technology database will assist the project partners to continue to improve vehicle efficiencies via the implementation of advanced low friction and energy loss components and systems, whilst respecting the economic and logistics constraints.

Reduction of Parasitic Losses
Lead Partner


Supporting Expertise

Coventry University
Jaguar Land Rover