Vehicle Transmission Control Method for Faster Gear Shifting

The patent applies preliminary action by determining the shift point in advance based on engine RPM and pre-calculating the optimal timing for fuel cutoff and clutch release. The ECU is programmed with predetermined shift maps that specify when to initiate the shift sequence, allowing the transmission to prepare for shifting before the actual gear change is needed, thereby reducing overall shift time while maintaining simple hardware architecture.

The patent utilizes parameter changes by dynamically adjusting fuel injection timing and amount, clutch engagement pressure, and shift actuator activation timing based on real-time engine RPM and load conditions. The TCU modifies these control parameters during the shift sequence to optimize the balance between rapid RPM reduction and smooth power delivery, improving acceleration response without adding mechanical complexity.

The patent implements feedback control by continuously monitoring engine RPM, throttle position, and transmission output speed during the shift process. The TCU uses this feedback information to dynamically adjust fuel cutoff timing, clutch release pressure curves, and shift actuator speed to maintain RPM within a target range, thereby suppressing shift shock and noise while using only software-based control logic rather than additional mechanical components.

The patent applies dynamics by making the shift control process adaptive and variable rather than fixed. The control strategy dynamically adjusts the aggressiveness of RPM reduction based on driving conditions - for example, using more aggressive fuel cutoff and faster clutch release during sport mode or rapid acceleration, and more gradual control during eco mode or steady-state cruising. This dynamic adjustment allows effective shock and noise suppression across diverse operating conditions without requiring complex mechanical shift control mechanisms.