Virtual Gear Shift Control for Realistic EV Power-Off Downshifts

The patent replaces the mechanical multi-speed transmission system with a virtual gear shift control system that uses software algorithms to simulate gear shifting effects. The controller calculates virtual engine speed and generates corresponding audio signals and torque adjustments to create the perception of gear changes without actual mechanical transmission components, thus simplifying the mechanical structure while preserving the driving experience.

The patent creates a virtual copy of the gear shifting experience by generating simulated engine sound profiles and torque characteristics that mimic traditional internal combustion engine vehicles. The system copies the sensory aspects of gear shifting (sound, vibration, torque changes) through electronic means, allowing drivers to experience familiar driving emotions without the complex mechanical transmission system.

The patent implements dynamic virtual gear shift control that adapts to real-time driving conditions. The controller continuously monitors vehicle speed, acceleration, and driver input to adjust the virtual gear shifting characteristics dynamically. This includes varying the timing, duration, and intensity of torque adjustments and sound playback based on current operational context, making the virtual shift feel more realistic and responsive to driving scenarios.

The patent changes multiple parameters simultaneously to enhance virtual gear shift quality: adjusting motor torque commands to create realistic torque gaps during downshifting, modifying virtual engine speed calculations based on gear stage transitions, varying audio output parameters (volume, frequency, timing) to match different gear conditions, and adjusting the rate of torque application to simulate mechanical shock characteristics of actual gear engagement.

The patent introduces periodic torque adjustments during virtual gear shifting that mimic the rhythmic characteristics of mechanical gear engagement. The controller applies torque commands in periodic pulses with specific timing patterns that correspond to the expected duration and frequency of actual gear shifts. This periodic action creates distinct shift events while maintaining overall driving smoothness through controlled application timing and duration.

The patent applies preliminary torque reduction before virtual downshifting to create anticipation and enhance the perceived shift effect. The controller reduces torque slightly before the scheduled shift moment, then applies a sharper torque increase during the shift event itself. This preliminary anti-action creates a more distinct and sporty shift feel by contrasting the pre-shift torque reduction with the post-shift torque increase, while still maintaining overall driving smoothness through controlled timing.