Problem of slip definition in driving systems

The pneumatic tire slip phenomena in vehicle driving system have been investigated for 100 years. Many models describe the tire –road force generation base on it, but in literature we can find various definition of slip. In this paper authors present the most known model of force generation and slip definitions and discuss consequences of choice of them. The model of force generation which is the combination of tire to road friction models and force carrying by deformable running elements which are getting and losing contact with road seems to be very simple and intuitive for process explanation. The implementation of the tire deformation model is the base for many models but is not easy to implement it into dynamic computer modelling of process. So for many years the most common models base on slip function. In paper the concept model is based on deformation introduced and its carry out balance is presented. This model has been adapted to other friction gears like belt gear or friction wheels modelling. The deformation model appears to be quite universal and developable to the energy efficiency analyses or acoustic wave generation