Electric Drive Torque Control via Battery Voltage Regulation

The patent implements dynamic torque limiting by continuously adjusting the torque limit based on real-time battery parameters including temperature, state of charge, and battery lifetime. Instead of using fixed open-loop torque limit tables, the system dynamically calculates appropriate torque limits by monitoring battery voltage and power output, allowing the torque limit to adapt to changing operating conditions. This eliminates the need for large safety margins while maintaining battery voltage within the operating range, thereby improving optimal operation without sacrificing reliability.

The patent employs feedback control by continuously monitoring battery voltage and power output during traction operation. When the battery voltage approaches the minimum operating voltage threshold, the system automatically adjusts the torque limit to prevent voltage from dropping below the threshold. This closed-loop feedback mechanism allows the traction system to maintain high power output when battery conditions permit, while automatically reducing torque demand when voltage stability is at risk, thus balancing productivity and reliability.

The patent implements a self-service control approach where the system automatically monitors its own battery parameters (voltage, power output, temperature, state of charge) and autonomously adjusts the torque limit without requiring complex external control logic. The control algorithm uses real-time battery measurements to calculate appropriate torque limits, eliminating the need for pre-programmed torque limit tables for every possible operating condition. This self-adjusting mechanism maintains battery voltage reliability while keeping the control system relatively simple.