The embodiment of the invention provides a method, a unit and a
system for assisting in track driving of a vehicle. The method comprises the steps that a predicted vehicle speed is calculated based on the preset maximum deceleration of a vehicle, a limit allowable vehicle speed for a target
driving mode selected by a driver is calculated, a plurality of detection points are preset on a racing track where the vehicle runs currently, the predicted vehicle speed refers to that the vehicle slows down at the preset maximum deceleration from the current position, and the limit allowable vehicle speed refers to the target
driving mode selected by the driver. The vehicle speed at which the vehicle travels to the next detection point along the recommended driving path; when the target
driving mode is a racing mode, if the predicted vehicle speed is greater than a limit allowable vehicle speed for the racing mode, forbidding the racing mode; and when the target driving mode is a drift mode, if the predicted vehicle speed is greater than a limit allowable vehicle speed for the drift mode, disabling the drift mode.