Abstract
SUMMARY This paper is concerned with the description of the open loop response of road vehicles to steering inputs. The important literature is reviewed for both steady state and transient response behaviour. The measures available for steady state response covering the whole range of lateral acceleration are discussed in detail, and sample measured data are presented. It is shown that the important quantities are the effective cornering stiffnesses of the front and rear tyres, how they are related, and how they vary with lateral acceleration. Transient response is only considered for the region of linear behaviour, where it is seen that a control theory approach is appropriate. A sample set of frequency response curves and step input responses are presented. It is concluded that satisfactory methods of measurement and description are available but that ‘desirable’ levels cannot yet be firmly specified.
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