Abstract. The article presents methodology for testing the traction parameters of the vehicle on the laboratory stand. The tests have been carried out using MAHA LPS 3000 chassis dynamometer. Power output can be measured in two ways, at steady state or during acceleration. Both have benefits as well as drawbacks. Car manufacturers are required to use steady state tests for certification of power output. It has an advantage as it is a well defined test that is easy to repeat and verify. The problem with results measured during acceleration is that the acceleration itself has a considerable effect on the result.
4WD systems include various constructions aimed at optimal distribution of torque between drive axles. In
these systems, it is necessary to apply mechanisms separating the power provided from the engine to drive
wheels. Many systems operate on the basis of wet multi-disc clutch or/and dog clutch control with the use
of mechatronic devices. However, in view of their reliability and construction simplicity, the most valuable
4WD systems under field conditions are mechanical solutions. Torsen is an inter-axle differential mechanism,
where the emerging internal friction moment of this mechanism causes that all kinematic discrepancies
between transmission shafts of the front and rear axle of a vehicle produce a change in the distribution of
torque, helping to level the rotational speeds of transmission shafts of the front and rear axles. As a result
of the phenomenon described, the drive wheels of both axles of the vehicle move with different peripheral
speeds, which causes energy losses and wear of tyres on both vehicle axles. This paper presents an analysis
of the results obtained in tests on a vehicle with the Torsen system and describes phenomena occurring in the
examined system as a result of emerging kinematic discrepancies, which may be caused by such factors as
vertical force acting on the wheels of individual drive axles and tyre pressure.
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