Patent ID: 7104122

Claim:
A vehicle straight-line performance adjusting method characterized by comprising steps of: reproducing an actually moving state of a vehicle which has been subjected to an alignment adjustment after the vehicle is mounted on rollers of a bench tester, and measuring the side force of each of wheels at this time; determining whether or not the measured side force is within a preset reference range; determining whether or not the side force of the wheel, which has been determined to be out of said reference range, is within said reference range when a toe angle of the wheel is corrected within a preset toe angle correction allowable range; correcting the toe angle within the correction allowable range when it is determined that the side force falls within the reference range, and correcting the side force to fall within the reference range; obtaining the side force of the each wheel after the toe angle is corrected, and calculating a drift amount of the vehicle from the obtained side force of the each wheel; and determining whether or not the vehicle has a good straight-line performance based on the calculated drift amount.