Abstract
Differences of car-handling behaviour between normal and emergency conditions have been investigated by mathematically simulating manoeuvres of change of lane, entry into a curve, going out from a curve, and straight running in gusty crosswinds.
A new ‘loose inverse procedure’ has been utilized to simulate these manoeuvres: the trajectory of each is followed, just as in actual road tests, by a tolerance which depends not only on the characteristics of the tyres and the car but also on the behaviour of the driver.
Calculations have shown that stronger tyres (i.e. of greater cornering stiffness) make the emergency manoeuvres less dangerous, since they increase the stability and the response of the car. Nevertheless, tyres of greater cornering stiffness may increase driver-stress in normal manoeuvres, since the same steer errors produce larger trajectory errors. This inconvenience may be eliminated if front roll understeer of the car is increased when these tyres are to be utilized.
Get full access to this article
View all access options for this article.