TPMS Mode Switching With Passive BLE Scanning in Traffic Jams
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Solution Overview
Problem
Tire pressure monitoring systems (TPMS) face energy wastage and frequency overload when switching from driving to stationary mode due to unnecessary signal transmission attempts, particularly in traffic jams.
Innovation Solution
Implementing a multi-threshold speed-based switching mechanism and passive scanning to transition between driving, intermediate, and standby modes, utilizing Bluetooth Low Energy technology for efficient communication with external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the monitoring device is permanently installed in the vehicle, then the measurement reliability is improved, but the device complexity and installation effort increase
Solution Approach 1:
The monitoring device transitions from a static permanent installation to a dynamic portable configuration that can be moved between vehicles. The device includes a power supply unit that can be connected to different vehicles' electrical systems, enabling flexible deployment without permanent mounting infrastructure.
Solution Approach 2:
The monitoring device is divided into separate functional modules including a control unit, power supply unit, and sensor units that can be independently connected or disconnected. This modular design simplifies installation and removal while maintaining measurement reliability during the monitoring period.
2Duration of action of stationary object
If the monitoring device is permanently installed in the vehicle, then the measurement duration is improved, but the loss of substance (vehicle modifications) increases
Solution Approach 1:
The monitoring device is extracted from the vehicle's permanent structure and designed as a portable external unit. All necessary components including power supply, sensors, and control units are contained within the device itself, requiring no extraction or modification of vehicle components for installation.
Solution Approach 2:
The device is designed for temporary deployment where it can be easily removed and transported to another vehicle. The portable design with integrated power supply allows the device to be discarded from one vehicle and recovered for use in another, eliminating permanent modifications while enabling extended measurement campaigns across multiple vehicles.
3Device complexity
If a portable monitoring device is used, then the device complexity is reduced, but the measurement reliability deteriorates due to power supply constraints
Solution Approach 1:
The power supply unit is designed to universally interface with different vehicle electrical systems through appropriate connectors and voltage regulation. The control unit can adapt to various power availability scenarios, ensuring reliable operation across different vehicle types without requiring vehicle-specific modifications.
Solution Approach 2:
The control unit continuously monitors the state of the power supply unit and adjusts its operation accordingly. When power availability is limited, the system can prioritize critical measurements, reduce sampling frequency for non-critical parameters, or alert the operator, thereby maintaining measurement reliability under portable operation constraints.
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating a monitoring device for at least one vehicle parameter, more particularly an air pressure sensor for the 'tyre pressure' vehicle parameter, wherein: the monitoring device is operated in a driving mode or in a stationary mode depending on the speed of the vehicle; in the stationary mode, connection signals for wireless connection to an external device, more particularly a configuration device for the monitoring device, are emitted and before the switch to the stationary mode, the monitoring device is operated in a first intermediate mode; in the first intermediate mode there is a passive search for wireless connection signals from the external device.