Abstract
Rolling resistance of tyres is one of the major resistive forces acting on any wheeled vehicle. Unfortunately, it is also one of the forces very difficult to measure. It is estimated that in certain traffic conditions (like for example constant speed driving with slow or moderate speed) so called Rolling Resistance Impact Factor may be as high as 0.3. This means that reduction of rolling resistance by 50% would lead to 15% of energy savings. The paper presents road measuring method of tyre rolling resistance and unique equipment used by the Technical University of Gdańsk designed to perform measurements of passenger car tyres. It also discusses road pavement, tyre and environmental conditions influence on rolling resistance. Also selected data describing current situation related to rolling resistance on different road pavements and rolling resistance of modern passenger car tyres including tyres specially designed for electric and hybrid vehicles are presented.
Highlights
In order to move every vehicle must overcome resistive forces acting on it
Tyre rolling resistance (FR) is the force resisting the motion of the tyre when it rolls on a road surface
This paper presents problems related to influence of tyre rolling resistance on overall energy consumption and problems related to measuring of rolling resistance force which is one of the most complicated to measure parameter of tyre/road interface
Summary
In order to move every vehicle must overcome resistive forces acting on it. Those forces are controlling the vehicle’s performance and energy consumption. Lower value of resistance means better acceleration, higher speed and lower energy consumption leading to longer range and less costly operation of the vehicle. Several resistive forces act or may act on a moving car. Some of the forces act on the vehicle all the time (rolling resistance, drag) some of them may not be present in a certain driving condition (inertia forces, up/downhill force, tow force)
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