Vehicle Powertrain Control for Shift Shock Reduction

The control system applies preliminary anti-action by detecting when both downshifting and braking operations are commanded simultaneously, and preemptively prioritizing the downshifting operation. The ECU suppresses the regenerative torque increase that would normally occur during braking, thereby preventing the harmful interaction between increased regenerative torque and downshift shock before it can occur. This resolves the contradiction by anticipating the conflict and taking preventive action.

The control system performs preliminary action by advancing the downshift timing when a conflict with braking operation is detected. By executing the downshift before the regenerative torque fully increases, the system ensures that the speed change mechanism completes its shift while regenerative torque remains at lower levels, thus avoiding shift shock while still allowing braking to occur subsequently.

The control system applies segmentation by dividing the torque control strategy into distinct operational modes: when downshifting is detected during braking, the system segments the control priority to favor downshift completion, temporarily suspending regenerative torque increase. This segmentation allows independent optimization of each function - shift quality during downshifting and regenerative braking performance during steady-state braking - without constant compromise between them.

The control system implements dynamics by making regenerative torque control flexible and adaptive based on operational context. Rather than maintaining a fixed regenerative torque profile during braking, the ECU dynamically adjusts torque levels based on whether downshifting is occurring, ensuring optimal performance for the current operational phase while maintaining overall system effectiveness.