Ionel Vieru

Plug-In Hybrid Vehicle with a Lithium Iron Phosphate Battery Traction Type

To promote in the academic environment the ways for reducing global warming produced by the Sport Utility Vehicles, the grand hamster—electric way 4WD concept has developed within the University of Pitesti. It is a Plug-in Hybrid Vehicle powered in electric/hybrid modes by a Lithium Iron Phosphate (LiFePO4) traction battery technology, 205 V, 12 kWh. The concept is developed on the Dacia DUSTER crossover vehicle, 4 × 2 series version by implementing an electric propulsion system in the rear axle. The objective of this project is to realize a 4WD environmentally-friendly vehicle maintaining the leisure of driving the vehicle in the city using the continuously variable transmission (CVT) in the electric mode and the diesel motorization outside of the town in the thermal mode. The architecture is parallel type and E-4WD with a standard diesel engine 1,5 dCi FAP, 79 kW(107 bhp) and 6 speed manual gearbox in the front, and an asynchronous electric motor 31 kW (41 bhp) coupled with the reduction and differential gearbox unit at the rear. The traction battery is monitored by a battery monitor and charged by an embarked charger. The charging and discharging of the battery is authorized by the Battery Management System. The paper presents the firsts performances of the vehicle on the road tests.

STUDY OF THE DYNAMIC BEHAVIOR OF A CAR BODY FOR MOUNTING THE REAR AXLE

This paper presents a dynamic analysis of the car body for mounting the rear axle. It was performed a study on the frequency response by determining the values for the inertances. The calculated values were compared with those provided by the specifications. FEM (Finite Element Method) was used as calculation method and the results were compared with those determined experimentally on the test bench.

The evaluation of the overall thermal comfort inside a vehicle

The thermal comfort is one of the most important aspects of the modern vehicles that can influence the safety, the fuel consumption and the pollutions regulation. The objective of this paper is to compare the global and absolute thermal comfort indexes for two vehicles with different distribution air systems inside the car cockpit, one using only front air vents, and the other using both front and rear air vents. The methodology of calculus consists in using the 3D model of the interior vehicle, generally in a CAD format. Then, using a meshing software to create the finite element model of the interior surfaces inside the cockpit and the volume of internal air. Using the obtained finite element geometry, there will be conducted a Theseus FE calculus using the given boundary conditions. The results of the numerical simulation are presented in terms of graphs and figures and also PMV, PPD and DTS thermal comfort indexes. With the obtained results, we will then create the graphs that allows us to evaluate the global and absolute thermal comfort indexes. The results of the evaluation show us that the use of the method allow us to evaluate with a greater accuracy the thermal comfort for the whole vehicle, not only for each passenger, like the standard methods. This shows us that in terms of general and absolute thermal comfort, the vehicle that use front and rear systems is better than the version that use only a front system. The thermal comfort is an important aspect to be taken into account from the beginning of the design stage of a vehicle, by choosing the right air conditioning system. In addition, by using the numerical simulation, we are able to reduce the time needed for preliminary tests and be able to provide the vehicle to the market earlier, at a lower development cost.

Improving the Road Traffic Regulation in the Area of Roundabout Intersections Function of the Traffic Streams Size

When it is not possible to improve the level of service of a roundabout by increasing its capacity, but only by diverting some of the traffic flows from the respective area, it is required to identify each traffic flow from that intersection. The determining of these traffic streams can be achieved by the proposed analytical relationships, depending on the traffic flows measured by fixed observers. This method of analytical determining the respective traffic streams in roundabout intersections was used for analyses of the traffic in areas with traffic problems in the municipality of Pitesti, completed with proposals for a better regulation of road traffic in the area of the Podul Viilor roundabout. The introduction of these measures is expected to lead to the elimination of traffic congestion in the roundabout analyzed and to improve road traffic in this type of intersection.

Virtual Model Used for Kinematics Study of Car’s Rear Axle

Abstract: The paper presents the possibility of generating a complex kinematic model that can be used to simulate various types of semi-independent rear axle used in the design of new cars. This model allows quick check for such axles of the interference that may occur in their functioning on the car. For application it was used the CATIA V5 software.