Tire Pressure Monitoring Mode Switching for Battery Life
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Solution Overview
Problem
Tire pressure monitoring devices face limitations in the number of operating modes due to integrated circuit constraints, leading to frequent use of a specific mode based on driving behavior, which negatively impacts battery life.
Innovation Solution
Implementing a timer to delay the change in operating mode until specific conditions are met, ensuring that changes in mode are only made under defined conditions, such as a prolonged stop, thereby extending battery life by avoiding frequent mode changes during short stops like traffic lights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tire pressure monitoring device operates in a mode with shorter transmission intervals to ensure frequent data availability, then the data transmission reliability is improved, but the battery energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the transmission interval adaptive rather than fixed. The control unit dynamically adjusts the transmission interval based on detected movement patterns: using shorter intervals when movement is detected (improving reliability) and longer intervals when no movement is detected (conserving energy). This resolves the contradiction by making the system behavior flexible and context-dependent.
Solution Approach 2:
The patent changes the transmission interval parameter based on movement detection. The control unit monitors acceleration sensor data and modifies the transmission interval parameter accordingly - switching between first time intervals (longer) and second time intervals (shorter) based on whether movement exceeds a threshold. This parameter adaptation resolves the contradiction between reliability and energy consumption.
2Adaptability or versatility
If the tire pressure monitoring device switches operating modes frequently to adapt to different driving behaviors, then the adaptability is improved, but the battery life deteriorates
Solution Approach 1:
The patent applies preliminary action by evaluating movement patterns and determining the appropriate transmission interval before actually switching operating modes. The control unit accumulates movement data, evaluates whether movement exceeds the threshold, and only then decides to switch modes. This preliminary evaluation prevents unnecessary frequent mode changes, thereby preserving battery life while maintaining adaptability.
Solution Approach 2:
The patent uses feedback from the acceleration sensor to continuously monitor movement patterns and provide input to the control unit. This feedback mechanism allows the system to adapt to driving behavior changes while avoiding unnecessary mode switches by requiring sustained movement patterns before triggering a mode change, thus balancing adaptability with battery conservation.
3Reliability
If the transmission interval is shortened to ensure frequent tire pressure data availability, then the monitoring reliability is improved, but the energy consumption increases
Solution Approach 1:
The patent applies periodic action by implementing two different transmission intervals: first time intervals for normal operation and second time intervals (shorter) when movement is detected. The system periodically transmits data at appropriate intervals based on movement detection, ensuring reliable monitoring when needed while conserving energy during stationary periods. This periodic adaptation resolves the contradiction between monitoring reliability and energy loss.
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 extends battery life by distinguishing between short and long stops, optimizing energy consumption by adjusting transmission intervals based on vehicle status, ensuring reliable data transmission without excessive energy use.
Implementation Method 1
an acceleration sensor... If, in the first operating mode, the acceleration sensor detects measured values below a predetermined reference value, and in the second operating mode, the acceleration sensor detects measured values above the reference value
Data Source
AI summary
The invention relates to a method for controlling the operating mode of a tire pressure monitoring device, wherein the tire pressure monitoring device is mounted on a vehicle wheel and comprises a pressure measuring device for determining the tire pressure, an acceleration sensor, and a transmission device for wirelessly transmitting tire pressure measurements to a receiving device, and can assume at least two operating modes, wherein in a first operating mode the tire pressure is repeatedly measured and transmitted at first time intervals, and in a second operating mode the tire pressure is repeatedly measured and transmitted at second time intervals that are shorter than the first time intervals, and wherein a switching condition is calculated.If, in the first operating mode, the accelerometer detects readings below a predefined reference value, and in the second operating mode, the accelerometer detects readings above the reference value, and a switching signal is generated from this, causing the tire pressure monitoring device to switch from the current operating mode to the other operating mode, a timer with a predefined runtime is provided, which is started when the switching condition is calculated and delays the generation of the switching signal until the runtime is reached. A corresponding tire pressure monitoring device is also specified.