Front-loading washing machine and unbalance detection method and device thereof
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Solution Overview
Problem
Front-loading washing machines face high costs and detection difficulties in unbalance detection, and dynamic unbalance detection during low-speed operation is not feasible, leading to potential mechanical damage during high-speed operation.
Innovation Solution
An unbalance detection method and device that detects torque variations during constant acceleration to determine dynamic unbalance, allowing for low-speed dynamic unbalance detection without sensors, controlling the drum to stop or perform shake-disperse operations based on threshold values to prevent mechanical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is adopted to detect whether the drum is balanced or not, then detection accuracy is improved, but cost increases and detection difficulty increases
Solution Approach 1:
The washing machine uses its own operational parameters (rotation speed, torque) to perform self-diagnosis of drum balance. The control unit analyzes the relationship between motor torque and rotation speed during operation to determine if the drum is balanced, eliminating the need for external sensors and making the system self-sufficient for detection purposes.
2Measurement precision
If dynamic unbalance detection is performed during high-speed operation, then detection accuracy is improved, but mechanical components may collide resulting in damage
Solution Approach 1:
The system performs balance detection during the acceleration phase before the drum reaches high-speed operation. By detecting unbalance conditions while the drum is still accelerating at lower speeds, the system identifies potential issues before they can cause mechanical components to collide and damage during high-speed rotation.
3Loss of energy
If the drum operates at constant rotation speed during low-speed operation phase, then energy consumption is reduced, but dynamic unbalance detection cannot be performed
Solution Approach 1:
The system performs balance detection during the acceleration phase when the drum is transitioning from low-speed to high-speed operation. By utilizing the dynamic acceleration process rather than requiring a separate detection phase, the system maintains energy efficiency while enabling balance detection through analysis of torque and rotation speed relationships during this transitional dynamic state.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces costs and detection complexity while enabling safe dynamic unbalance detection at low speeds, avoiding mechanical damage from high-speed collisions, and allowing for continuous operation with static unbalance detection at low speeds.
Implementation Method 1
during an accelerative operation of the drum according to a constant acceleration, detecting a torque of the drum
Data Source
AI summary
The present disclosure relates to a front-loading washing machine and an unbalance detection method and device thereof. The method comprises: when a drum operates at a low constant speed, detecting the torque of the drum and acquiring average torque values; when the roller operates at a constant acceleration speed, acquiring average torque values and a minimum value of the average torque values of the drum in real time; determining whether a difference between the average torque and the minimum value of the average torque values is greater than a preset unbalance threshold; and if so, determining that dynamic unbalance occurs on the drum; otherwise determining that no dynamic unbalance occurs on the drum. Because no sensor is needed for unbalance detection, cost and the detection difficulty are lowered, and damages to mechanical components due to collisions caused by dynamic unbalance when the drum operates at a high speed is avoided.