Sensor Module Dynamic Voltage Measurement Interval
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Solution Overview
Problem
Conventional methods for monitoring residual battery capacity in vehicles consume excessive power, leading to premature battery replacement and inefficient power management.
Innovation Solution
A sensor module that adjusts measurement intervals based on battery voltage, reducing power consumption by lowering measurement frequency when the battery is fully charged and increasing it when the capacity is low, using internal resistance calculations for accurate capacity estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the residual battery capacity is constantly monitored using conventional methods, then the battery replacement timing can be determined, but excessive power is consumed leading to premature battery replacement
Solution Approach 1:
The measurement interval is dynamically adjusted based on battery voltage levels. When voltage is high (fully charged state), the measurement interval is set to a first time interval (longer period). When voltage drops below a threshold, the measurement interval is set to a second time interval (shorter period). This dynamic adjustment reduces power consumption during high-capacity states while maintaining monitoring accuracy when capacity is low.
Solution Approach 2:
The system changes the measurement parameter (time interval) based on the battery's state of charge. By monitoring battery voltage and comparing it against predefined thresholds, the system switches between different measurement frequencies. This parameter change allows the system to optimize between power consumption and monitoring accuracy according to the current battery capacity level.
2Loss of energy
If the measurement frequency is reduced to suppress power consumption, then power efficiency improves, but the accuracy of residual battery capacity estimation may deteriorate
Solution Approach 1:
Different measurement frequencies are applied to different battery capacity states. High-capacity states (voltage above threshold) use lower measurement frequency (first time interval), while low-capacity states (voltage below threshold) use higher measurement frequency (second time interval). This localized quality approach ensures that power consumption is optimized for each operational state without compromising overall monitoring accuracy.
Solution Approach 2:
The system continuously monitors battery voltage and uses this feedback to adjust the measurement interval. When voltage drops below the predefined threshold, the system automatically increases measurement frequency. This feedback mechanism ensures that measurement precision is maintained during critical low-capacity periods while allowing power consumption to be reduced during high-capacity periods.
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 effectively suppresses power consumption during full charge states while maintaining accurate battery capacity estimation, thereby extending the sensor's operational life and ensuring timely battery replacement notifications.
Implementation Method 1
a voltage measurement unit configured to measure an end-to-end voltage of the battery
Implementation Method 2
an internal resistance calculation unit configured to calculate an internal resistance using the end-to-end voltage of the battery measured by the voltage measurement unit
Data Source
Figure 1
Figure 2
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AI summary
A sensor module 1 includes a sensor 11, a wireless communication unit 12 notifying a measurement value obtained by the sensor and a value based on the measurement value, a battery 2 supplying a voltage to an electric circuit 3 including the sensor 11 and the wireless communication unit 12, a voltage measurement unit 13 measuring an end-to-end voltage of the battery at a predetermined measurement interval, and a measurement interval change unit changing the measurement interval of the voltage measurement unit 13, wherein the measurement interval change unit sets, if the end-to-end voltage of the battery measured by the voltage measurement unit is equal to or greater than a first specified voltage value previously set, the measurement interval to a first time interval, and the measurement interval change unit sets, if the end-to-end voltage measured by the voltage measurement unit is lower than the first specified voltage value, the measurement interval to a second time interval shorter than the first time interval.