Fuel Cell Hydrogen Purge Valve PWM Control for Low-Current Purging

The patent applies dynamics by making the valve opening degree variable rather than fixed. The controller dynamically adjusts the opening degree of the purge valve based on the accumulated current value, allowing the system to adapt to different operating conditions. This resolves the contradiction by enabling continuous real-time purging with variable opening degrees instead of fixed periodic purging, achieving both timely purging and efficient hydrogen removal even during low current conditions.

The patent changes the parameter of valve opening degree from a fixed binary state (open/closed) to a variable continuous parameter. By controlling the opening degree based on accumulated current value, the system can perform proportional purging where the purge amount corresponds to the hydrogen accumulation level. This resolves the contradiction by enabling real-time purging with adjusted opening degrees, eliminating purge delays while maintaining purge efficiency.

The patent replaces complex mechanical control mechanisms with electronic control. Instead of using complex mechanical valve mechanisms or multiple sensors, the system uses a controller that calculates accumulated current value and generates control signals based on predetermined relationships. This resolves the contradiction by achieving real-time purging control through software/algorithms rather than complex hardware, maintaining simplicity while enabling precise control.

The system performs self-service by using its own operational data (current value) to automatically control the purge valve. The controller accumulates current values during operation and automatically determines the appropriate opening degree without requiring external input or complex decision-making systems. This resolves the contradiction by enabling intelligent real-time purging control through self-monitoring and self-adjustment, avoiding the need for additional complex control infrastructure.