Wheel Transmitter Protocol Fallback After Memory Loss
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Solution Overview
Problem
Transmitters used in tire condition monitoring systems face issues where selection information stored in volatile memory can be unintentionally deleted, leading to failure in transmitting data to receivers, as they rely on specific protocols for communication.
Innovation Solution
The transmitter includes both nonvolatile and volatile memory, where the nonvolatile memory stores multiple protocols and the volatile memory stores selection information. If the selection information is deleted, the transmitter sends data conforming to all protocols, ensuring that the receiver can still receive data, and includes a flag indicating the absence of selection information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If selection information is stored in volatile memory to enable protocol selection, then the transmitter can correspond to multiple types of receivers, but the selection information may be unintentionally deleted causing communication failure
Solution Approach 1:
The transmitter performs preliminary action by storing multiple protocol types in the nonvolatile memory before operation. When selection information is deleted from volatile memory, the system can immediately fall back to transmitting data conforming to all stored protocols without requiring reconfiguration or losing communication capability.
Solution Approach 2:
The system changes the parameter of protocol transmission mode dynamically: when selection information is present, it transmits data conforming to the selected protocol only; when selection information is deleted, it changes to transmitting data conforming to all protocols stored in nonvolatile memory, ensuring continuous communication.
2Reliability
If the transmitter transmits data conforming to all protocols when selection information is deleted, then the receiver can still receive transmission data, but the transmission data size increases
Solution Approach 1:
The system applies partial action by selectively transmitting protocol data only when necessary. When selection information is valid, it transmits only the specific protocol data needed. When selection information is deleted, it temporarily transmits all protocol data as an excessive measure to ensure receiver compatibility, but this is a fallback state rather than continuous operation.
Data Source
AI summary
A transmitter is attached to each of wheel assemblies of a vehicle and transmits transmission data to a receiver. The transmitter includes a nonvolatile memory that stores multiple types of protocols, a volatile memory that stores selection information, and a transmitting unit. The selection information represents a protocol that is selected from the multiple types of protocols stored in the nonvolatile memory and corresponds to the receiver. The transmitting unit transmits transmission data conforming to a protocol. The transmitting unit transmits the transmission data conforming to the protocol represented by the selection information when the selection information is stored in the volatile memory. Also, the transmitting unit transmits the transmission data conforming to all the protocols stored in the nonvolatile memory when the selection information is not stored in the volatile memory.