Discussion on: “Combining Slip and Deceleration Control for Brake-by-wire Control Systems: A Sliding-mode Approach”

Abstract

The chapter starts with an examination of the forces created by the tyre. The tyre plays a fundamental part in vehicle dynamics since it is from the tyres that all the forces responsible for accelerating a vehicle longitudinally, in acceleration and braking, and laterally, in cornering, are generated. In addition, the tyre produces the vertical load that supports the corner load. Thus, forces are generated in all three directions. In addition, the tyre generates moments about all three directions, and so, a tyre is a device offering a six-degree-of-freedom compliance between the road surface and the axle. Following this examination, the mechanisms of grip generation are reviewed. Considerations such as chemistry, shape, temperature and inflation pressure are all presented, and the way in which they influence grip is considered. The construction of the tyre is examined, and in particular, the way in which lateral and longitudinal forces are developed is explained in detail. Camber thrust is similarly treated. The concept of the friction circle is developed, and the way in which lateral and longitudinal forces vary through a corner is examined. Consideration of tyre modelling and tyre testing is presented. The treatment offers a very comprehensive introduction to tyres and to their modelling and operation. There are questions, learning exercises and guided internet-based research to develop knowledge further.