Automatic Transmission Discharge Speed Control for Neutral Shift Shock

The patent applies dynamics by making the discharge speed of hydraulic fluid variable rather than fixed. The discharge speed switching section dynamically adjusts the discharge speed based on the disengagement state of the frictional engagement element. Initially, the discharge speed is increased rapidly to ensure responsive disengagement, then it is reduced to prevent shock. This dynamic adjustment resolves the contradiction between responsiveness and shock prevention.

The patent applies preliminary action by increasing the discharge speed of hydraulic fluid before the actual disengagement occurs. The discharge speed switching section anticipates the need for rapid disengagement and prepares by increasing hydraulic fluid discharge speed in advance. This preliminary increase in discharge speed ensures that when disengagement is needed, it occurs rapidly and responsively, while subsequent reduction prevents shock.

The patent applies self-service by making the frictional engagement element automatically control its own disengagement process. The element monitors its own engagement state and autonomously adjusts the discharge speed of hydraulic fluid through the discharge speed switching section. This eliminates the need for complex external learning control systems, as the element itself manages the timing and speed adjustments needed for shock-free disengagement.

The patent applies taking out by extracting the complex learning control function from the overall system and replacing it with a simpler discharge speed switching mechanism. Instead of implementing sophisticated learning algorithms to determine optimal disengagement timing, the patent extracts the essential function of timing control and implements it through the discharge speed switching section that automatically responds to the frictional engagement element's state, thereby simplifying the control process.