METHOD FOR DETECTING AND CORRECTING VEHICLE REFERENCE SPEED, AND VEHICLE SYSTEM

摘要

The invention relates to a method for detecting and correcting vehicle reference speed, in particular when said speed undergoes a controlled reduction due to drag and/or regeneration torque, of a motor vehicle, in particular an all-wheel drive vehicle, comprising a motor (110) and a motor control unit (120), wherein the longitudinal acceleration of the motor vehicle is measured with the aid of a sensor, and the wheel accelerations are determined with the aid of wheel speed sensors (146). The method is to provide both extremely reliable determination of the vehicle reference speed and the initiation of corrective measures once a controlled reduction has been recognized, and also to utilize standard components and control routines. The following steps are carried out for this purpose: filtering the wheel accelerations, filtering the longitudinal acceleration, forming a corrected longitudinal acceleration by applying a safety offset and a correction offset to the filtered longitudinal acceleration, and temporal integration of the difference between the corrected longitudinal acceleration and the respective wheel acceleration. In the event a threshold value of the absolute value of the difference is exceeded during a predetermined time interval with a preset number of wheels, steps for correction are initiated.