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The objective of this work is analyze the weight influence in super economic vehicle rolling resistance tyre for low velocity. One of the principal factors in fuel consume is the rolling resistance, once, in low velocity the aerodynamic drag is not very pronunciation. The rolling resistance analysis was made using a rolling belt instrumented with velocity between 1.5 km/h and 9 km/h) and weight between 0 (zero) and 300 N. The analysis results, permits an equation elaboration, relationship weight and velocity for one tyre rigidity.

This work was made for drag force determination applied over the body of a super economic vehicle and respectively the drag coefficient, through a model in reduced scale, aerodynamic methods measurements in wind tunnel and CFD. For the research was built a model in vehicle scale of 1:6, where is analyzed in a wind tunnel with open section of 0.28 m2. The research were accomplished by drag force in a scale model where was determined through a data acquisition system that is made up: a flexible stem located at the centre of the model, tied to the same a string that made traction in the system through a rolling and a mass on the balance in the wind tunnel external part. The main results obtained in the accomplished work were the drag coefficient for a very low speed of 3.6 km/h so with that the determination drag coefficient can have an estimate drag force applied in the vehicle body that belongs to 3.56 N to a speed of 25 km/h.

The objective of this work is to elaborate a software to determine characteristics such as torque, power and speed for transmission relation and rotation. The vehicle transmission is a component that is responsible for transmitting the motor power to drive vehicle wheels. The chemical energy (fuel) in power train is transformed in mechanical energy and in the most used cases are: internal combustion motors with Otto cycle and as well, as the Diesel cycle. The whole power train works on a certain rotations band, which is limited by the motor rotation. The dynamic condition of a vehicle is obtained with the resistance equation movement (rolling and drag). In other words, through it occurs the force balance in transmission with the need to force in the traction wheels, usually well known with resistance to the movement. The software elaborated in Excel was validated with experimental results.

The purpose of this work is to make a system for to measure the rolling force using a tire and a moving belt. The starting point is to establish study arguments as tire pressure, camber, divergence, convergence and steering knuckle force. The low cost made equipment allows the angles adjustment, and applied load on the wheel axis. The rolling resistance between tire and the moving belt in different speeds is measured using a load cell especially developed for the dynamic measurement. The system is able to measure under a diversity of conditions, offering results for tires choices and suspensions project.