Sizing improvement of hybrid storage system composed with high energy and high power Li-ion batteries for automotive applications

In this article, an algorithm has been developed to study the influence of hybrid energy storages system management on the performance of this last one in terms of weight, volume, cost and stresses applied to the two storage systems witch compose our source. The main storage system is composed with a high energy or ultra high energy density batteries. Otherwise, the secondary one can be an ultra high power, high power batteries or supercapacitor. Simulation results show that gains in weight and volume are obtained using ultra high energy cells as the main battery or/and an ultra high power as secondary source. The power management is improved to ameliorate the performances of storage system for automotive application.

Optimisation of Diesel Engine for Hybrid Military Tracked Vehicles using Matlab-Simulink

<p class="Abstract">The demand in the technology requirements for diesel engines is growing keeping hybrid vehicles in mind. In future the diesel engine no longer drives the wheels directly; as a result the engine can be engaged at a limited number of operating points, thus, offering an opportunity to optimise the fuel efficiency and performance at those operating points. The extent to which this optimisation is possible is limited by practical considerations. Also if the positive and negative power peaks in vehicle during mobility (e.g. acceleration and regenerative braking respectively) can be accommodated by high-power batteries, then the size of the engine can be considerably reduced. The engine’s operating points depend on the power-control strategy. The consequences of modifications to these operating points will have an effect on performance and efficiency. As in series hybrid only a limited number of operating points are involved and dynamic performance requirements are not imposed on the diesel engine, significant improvements can be achieved by the optimisation of the diesel engine at these operating points. The feasibility of optimisation of the engine at these operating points can be done by modification on the injection systems, the valve timings and other such parameters. This kind of approach requires the use of complex and repeated experimental analysis of the engine which is costly, cumbersome and time consuming. An alternative to this kind of experimental approach is to develop a simulation model of the engine with the generator in Matlab- Simulink.</p>