![]() ![]() This causes a problem of extreme troublesomeness. ![]() However, actual measurement of a turning radius needs to be carried out a plurality of times corresponding to a plurality of different steering angles. Conventionally, after the vehicle has made turns by a plurality of different steering angles, respective turning radii of the vehicle are actually measured and data thus obtained are interpolated or processed otherwise to obtain a turning radius of the vehicle. To draw a predicted locus during backward movement of the vehicle in this manner, a vehicle turning radius corresponding to an arbitrary steering angle is required. instruction means by overlaying a vehicle path based on present steering angle over an image without processing that imageÄisclosed is a turning radius calculation method including: expressing a steering system model by means of relational expressions having a steering angle and turning angles of outer and inner tires as variables and including known parameters and unknown parameters entering data on the known parameters based on design data calculating the unknown parameters from the relational expressions corresponding to a zero-steering state and the relational expressions corresponding to a full-steering state calculating turning angles of outer and inner tires respectively corresponding to a plurality of steering angles between the zero-steering state and the full-steering state using the relational expressions where calculated data on the unknown parameters are entered calculating turning radii corresponding to the calculated turning angles of the outer and inner tires and calculating an approximate function of turning radius for steering angle based on the plurality of steering angles and the turning radii.
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