Method for determining blockage of filter mesh of clothes dryer, determining apparatus, and clothes dryer

The patent changes the detection parameter from temperature to motor electrical parameters (current, power, voltage) and rotational speed. These electrical parameters respond much faster to filter blockage conditions than temperature, eliminating the hysteresis problem. The control module monitors motor current and power consumption, which change immediately when airflow resistance increases due to filter blockage, enabling rapid and accurate detection.

The patent replaces the thermal-based detection system with an electrical-based detection system. Instead of using temperature sensors and thermal field measurements, the system uses electrical sensors to monitor motor current, power, and rotational speed. This substitution of detection methodology provides faster response time and higher accuracy in detecting filter blockage conditions.

The patent implements dynamic threshold adjustment based on motor rotational speed. The control module divides the motor's rotational speed range into multiple speed ranges, each with its own corresponding electrical parameter thresholds. As the motor speed changes during operation, the appropriate threshold is automatically selected, ensuring accurate blockage detection across all operating conditions while maintaining relatively simple determination logic.

The patent changes the threshold from a fixed value to a dynamic value that varies with motor rotational speed. The control module stores multiple threshold values corresponding to different speed ranges and automatically selects the appropriate threshold based on current motor operation. This allows the system to maintain high detection accuracy across varying loads and operating conditions without significantly increasing system complexity.