Electronic Towel Dispenser Sensor Control for Battery Saving
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Solution Overview
Problem
Conventional hands-free electronic towel dispensers face challenges in reducing battery power consumption, which affects their operational efficiency and longevity.
Innovation Solution
The dispenser incorporates a sensor system that adjusts its scanning rate based on usage patterns, switching to a lower pulse rate during low usage periods to conserve power while ensuring timely dispensing, and includes a mechanism to prevent subsequent dispensing cycles until a previously dispensed sheet is removed, allowing for efficient battery life management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensor system operates at a high pulse rate to ensure timely detection of users, then the detection responsiveness is improved, but the battery power consumption increases
Solution Approach 1:
The sensor system dynamically adjusts its pulse rate based on usage patterns. During high usage periods, the system operates at a first (higher) pulse rate to ensure timely detection. During low usage periods, it automatically transitions to a second (lower) pulse rate to conserve battery power, thus resolving the contradiction between detection responsiveness and power consumption
Solution Approach 2:
The invention changes the operational parameter (pulse rate) of the sensor system based on detected usage patterns. By monitoring whether the dispenser is in a high usage or low usage state, the system adjusts the pulse rate parameter accordingly, achieving optimal balance between detection speed and energy consumption
2Reliability
If the sensor system operates continuously at a high pulse rate, then user detection reliability is improved, but the battery life decreases
Solution Approach 1:
Instead of continuous high-rate operation, the sensor system employs periodic scanning at variable pulse rates. During low usage periods, the system performs scans at a reduced pulse rate, maintaining adequate detection reliability while significantly extending battery life. The periodic nature of the scanning allows the system to balance reliability requirements with power conservation
3Ease of operation
If the dispenser allows immediate subsequent dispensing cycles, then user convenience is improved, but power consumption increases during high traffic periods
Solution Approach 1:
The system uses feedback from usage patterns to intelligently control the sensor pulse rate. When multiple users are detected in succession (high traffic), the system maintains higher pulse rates to ensure each user is detected and served conveniently. When usage slows down, the system reduces pulse rate to conserve power, thus balancing user convenience with power consumption through feedback-driven adaptation
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
This approach reduces power consumption by up to 50% during off-peak hours and ensures continuous operation by dynamically adjusting scanning rates, thereby extending battery life and maintaining user convenience.
Implementation Method 1
Typical systems may include radio frequency (RF), infrared (IR) sensors, or the like. For example, U.S. Pat. No. 6,695,246 describes an electronic dispenser utilizing an active IR sensing system.
Data Source
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AI summary
A hands-free towel dispenser (10) includes a housing (16) having an internal volume that may contain at least one roll of towel material. Within the dispenser (10) a dispensing mechanism is in communication with a sensor system which scans for the presence of a user at a first pulse rate and initiates a dispense cycle upon sensing a user. The sensor system has at least one sensor (80) and is in electrical communication with a control circuit which is configured to determine the time that has elapsed from the last dispense cycle and compare the elapsed time with a preset value. If the elapsed time is greater than the preset value, the control circuit configures the sensor system to scan for the presence of a user at a second pulse rate. Upon detecting a user, the control circuit initiates a dispense cycle and sets the sensor system to scan for the presence of a user at the first pulse rate.