Cause of oversteer
During the steering process, each wheel forms a certain side angle, that is, a certain lateral slip ratio, which forms a certain lateral adhesion coefficient and lateral force, and the lateral force can ensure a stable steering when the vehicle turns. At the same time, since the automobile is subjected to centrifugal force, the wheel load of the inner wheel of the curve becomes small, and the wheel load of the outer wheel becomes large. When the car brakes, the wheel produces a longitudinal deceleration, which causes the wheel load of the front wheel to increase, and the wheel load of the rear wheel decreases. At the same wheel side angle, the lateral force of the front wheel increases. The lateral force of the wheel is reduced, and the original balance relationship is broken, so that excessive yaw moment will cause the car to drive toward the inside of the curve, and the car tends to turn too much.