Method and device for controlling synchronizer in automatic mechanical gearbox

The invention discloses a method for controlling a synchronizer in an automatic mechanical gearbox. The method includes the steps that the rotating speed of an input shaft, the rotating speed of an output shaft and the transmission ratio of the current gear of the automatic mechanical gearbox are determined; the current presynchronization position and the complete synchronization position of the synchronizer are judged according to the rotating speed of the input shaft, the rotating speed of the output shaft and the transmission ratio of the current gear; the synchronizer is controlled correspondingly based on the presynchronization position and the complete synchronization position of the synchronizer. The invention further discloses a device for controlling the synchronizer in the automatic mechanical gearbox.