2results about How to "Shorten shift time" patented technology

This invention discloses a method for self-learning the clutch of an AMT (Automated Manual Transmission) in commercial vehicles, specifically including the following steps: Step 1: Determine whether the current vehicle meets the self-learning conditions; if so, proceed to Step 2; Step 2: Clutch self-learning: After activating clutch self-learning, the clutch will perform two rounds of disengagement and engagement; Step 3: After the clutch performs two disengagement and engagement actions, the learned parameters are stored in the TCU (Tracking Control Unit), completing one clutch self-learning cycle; Step 4: Repeat the above process to complete multiple clutch self-learning cycles. The method of this invention defines the complete disengagement point and the first, second, and third contact points by using the input shaft speed as a threshold, resulting in higher recognition accuracy and a simpler and more efficient TCU judgment and calculation logic.

The application discloses a kind of mechanical automatic transmission rotational speed synchronization self-adjusting predictive control method, comprising: the initial length of calculating brake combination signal sending to brake torque reaches constant value time point;Brake shaft speed drop value during brake torque constant time point is calculated to brake torque start to produce brake torque;Brake torque is zero during brake torque from constant brake torque start to reduce, and brake shaft speed drop value;According to the initial value of dynamic speed difference threshold value calculated according to the above results;Test the extreme value of brake friction plate separation torque reduction stage duration;According to the initial value of the extreme value of brake shaft speed curve parameter in separation torque reduction stage;According to the size relationship between the difference between the target speed of brake shaft before braking and current speed and dynamic speed difference threshold value, the rotational speed synchronization of transmission is controlled.The application improves control accuracy, shortens gear shifting time, improves gear shifting smoothness, enhances the robustness and stability of control method under time-varying working condition.