TPMS Sensor Positioning With Motion-Based Power Saving
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Solution Overview
Problem
Conventional tire pressure detection sensors continuously consume power when the vehicle is stationary, leading to reduced lifespan and unnecessary energy waste, as they maintain signal transmission regardless of tire movement.
Innovation Solution
Implementing built-in acceleration units in tire pressure detection sensors to differentiate between driving and parking modes, using threshold values to determine tire movement, enabling selective data transmission and power conservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tire pressure detection sensors continuously transmit signals to the central control system, then driving safety is ensured, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic transmission mode switching based on vehicle state. The control unit determines whether the vehicle is moving or stationary and adjusts the transmission frequency accordingly - continuous transmission when moving, intermittent transmission when stationary. This dynamic adaptation resolves the contradiction by maintaining safety during operation while conserving energy during parking.
Solution Approach 2:
The patent employs periodic transmission intervals during stationary states. Instead of continuous transmission, the sensor transmits data at predetermined intervals when the vehicle is parked, while maintaining continuous transmission when the vehicle is in motion. This periodic action significantly reduces power consumption during non-operational periods while preserving monitoring capability.
2Reliability
If tire pressure detection sensors maintain continuous signal transmission during vehicle replacement operations, then real-time monitoring is achieved, but sensor lifespan is reduced
Solution Approach 1:
The system dynamically adjusts transmission behavior based on detected vehicle motion. During replacement operations, when tires are manually moved or rolled, the acceleration sensor detects this motion and the control unit switches to continuous transmission mode to maintain monitoring. When tires are stationary during the process, transmission is reduced to intermittent mode, extending sensor lifespan while preserving essential monitoring capability.
Solution Approach 2:
The sensor system uses its built-in acceleration sensor to autonomously detect motion states and self-adjust transmission modes without external intervention. This self-service capability allows the sensor to automatically differentiate between operational monitoring (requiring continuous transmission) and stationary states (allowing intermittent transmission), thereby extending lifespan while maintaining necessary monitoring functions.
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
Enables precise determination of tire state for automatic positioning while conserving power, extending sensor lifespan and reducing unnecessary power consumption.
Implementation Method 1
each tire pressure detection sensor has a built-in acceleration unit to detect movement of each tire
Data Source
AI summary
A method for automatically positioning and energy-saving for tire pressure detection sensors includes driving/parking mode determination, first and second parking advanced determination steps, message transmission comparison, and data reset steps. Through predefined threshold values (driving, parking, movement, automatic positioning, and movement variation interval values) within each tire pressure detection sensor, the system distinguishes between driving and parking modes. In parking mode, movement count of the tire pressure detection sensor in each tire is recorded and compared with the threshold values. The vehicle's host determines whether automatic positioning should be performed based on these comparisons, enabling positioning only under appropriate conditions. This saves power consumption of tire pressure detection sensors, eliminates unnecessary automatic positioning execution time, and provides immediate accurate tire information upon driving, achieving both time and energy savings.