HEVBS

The HEVBS project focuses on the design of energy storage system, the modelling of the vehicle functions and architecture and finally, the implementation of an energy recovery system used for acceleration and braking phases.

The exhaustion and the increased cost of fossil fuels on the one hand, and the environmental problems caused by emissions of CO2 in the atmosphere on the other hand, are forcing many automotive manufactures to develop major research programs in the design of electric vehicles and hybrid electric. In this context, this project aims to propose an innovative hybrid drivetrain consisting of a vehicle combining heat and electric power in order to optimize the energy we can store from regenerative braking. This work was conducted as part of a project in collaboration with M.Guionie’s Company. More specifically, the project has focused on the design of energy storage system, the modelling of the vehicle functions and architecture and finally, the implementation of an energy recovery system used for acceleration and braking phases.

The project is presented and explained in a final report where, in a first part, the final context of the project is reminded and the requirements of the end users are defined. In this same part is also proposed a literature review, a state of art on the existing hybrid electric vehicles and energy recovery and storage systems. This allows then to introduce the innovative concept of hybrid drivetrain described above, based somewhat on a road coupling powers of thermal and electric propulsion.

The second part presents the functional architecture of our solution. In this part is first modelled the complete architecture of the vehicle with our regenerative system integrated in this architecture. In a second time, this part presents the choice of the different parameters set to each component of our system depending on the vehicle characteristics and it offers an analytical approach simple calculation based on the tasks set by the partner, M.Guionie. Then, our solution is compared to the state of art enabling to define the innovative aspects and the differentiating factors of our project.

The third part of the report describes our technical solution. It begins with the design of the storage system chosen which is a pack of ultracapacitors. Our technical solution consists of a simulation of our system with the use of the simulation software called AMESim. Indeed, it consists in simulating the complete architecture of the vehicle, the energy regenerative system and also the vehicle control algorithm. This allows predicting the behaviour of the vehicle in its different life phases and defining the transitions between these phases. This stage of virtual prototyping is essential to verify the functionality of the upstream and vehicle safety.

Finally, the fourth and final part of the report presents a critical analysis of the results obtained. Indeed, in this part the results obtained are regarding the amount of energy regenerated. We have considered three different systems that we simulated on the software: the vehicle without the regenerative system, the vehicle with the regenerative system but without our storage system (ultracapacitor) and the vehicle with the regenerative system and our storage system. Comparing the three different results, we could see the real innovation of our project with the big difference of quantity of energy saved thanks to our solution compared to the requirements and state of the art. So the design approaches and modelling of sources are validated, while also demonstrated the feasibility of a hybrid electric powertrain coupling the road.

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