EV Motor Torque Filtering During PRND Garage Shifts

The system dynamically adjusts the torque transition strategy based on shifter position changes. During garage shifts, the controller implements a two-stage torque management: first allowing temporary negative torque to complete the shift smoothly, then applying quadrant protection. This dynamic adaptation resolves the contradiction by making the protection system flexible rather than rigid, maintaining comfort during transitions while ensuring protection after shifts complete.

The controller detects shifter position changes in advance and prepares the torque transition accordingly. By monitoring the shifter state and anticipating garage shift maneuvers, the system can smoothly transition torque to zero before the actual shift occurs, preventing abrupt changes. This preliminary detection and preparation resolves the contradiction by proactively managing torque rather than reactively cutting it.

The controller acts as an intermediary between the driver's torque request and the motor execution. It introduces a filtering mechanism that smoothly transitions torque commands during garage shifts, mediating between the abrupt shift demand and the motor's torque output. This intermediary filtering layer improves comfort while adding minimal complexity, as it only activates during specific shifter transition conditions.

The enhanced control complexity is applied locally only during garage shift transitions rather than continuously. The controller monitors shifter position and applies smooth torque filtering only when detecting PRNLD shift patterns at low speeds. For all other operating conditions, the system uses standard quadrant protection logic. This localized application of enhanced control resolves the contradiction by limiting complexity to where it is most needed.