Master Bus Device Dynamic Diagnostic Message Insertion
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Solution Overview
Problem
Existing master bus devices for motor vehicle communication buses, such as LIN buses, are inefficient as they must reserve time slots for both normal operation and diagnostic communication, limiting bandwidth for essential vehicle functions during normal operation.
Innovation Solution
A master bus device that processes a schedule cyclically for normal operation but interrupts this schedule to transmit special diagnostic messages upon request, allowing for flexible insertion of diagnostic messages without pre-reserving time slots, thereby optimizing bandwidth for normal operation messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time slots are reserved for diagnostic communication in the schedule, then diagnostic communication can be performed, but bandwidth for normal operation messages is reduced
Solution Approach 1:
The system dynamically switches between normal operation mode and diagnostic mode by interrupting the cyclic schedule processing. When a diagnostic request is received, the schedule is interrupted and diagnostic messages are transmitted instead. This dynamic adaptation allows the system to allocate bandwidth flexibly based on actual needs rather than reserving fixed time slots, thereby resolving the contradiction between diagnostic capability and normal operation bandwidth.
Solution Approach 2:
The vehicle communication bus serves multiple functions: normal operation message transmission and diagnostic communication. By making the bus universally applicable for both purposes without dedicated reserved slots, the system optimizes bandwidth utilization. The same communication infrastructure handles both regular vehicle operation data and diagnostic data, eliminating the need for separate reserved time slots for diagnostics.
2Adaptability or versatility
If the schedule is interrupted for diagnostic messages, then diagnostic communication is enabled, but normal operation timing is delayed
Solution Approach 1:
The system performs only the necessary diagnostic communication actions when requested, rather than continuously interrupting the schedule. Diagnostic messages are transmitted partially (only when needed) by interrupting the schedule temporarily, then resuming normal operation. This partial action approach enables flexible diagnostic insertion while minimizing time loss for normal operations.
3Device complexity
If fixed message types are used in the schedule, then communication protocol is simple, but adaptability to different communication needs is limited
Solution Approach 1:
The message type is dynamically determined based on the operational mode. During normal operation, fixed message types from the schedule are used for simplicity. When diagnostic mode is activated by interrupting the schedule, diagnostic message types are used instead. This dynamic message type selection maintains protocol simplicity for normal operations while providing flexibility for different communication needs including diagnostics.
Data Source
AI summary
The invention relates to a motor vehicle comprising a master bus device (14) which is designed to exchange messages with slave bus devices (16) via a vehicle communication bus (12) of the motor vehicle (10), a transmitter (20) of the master bus device (14) exchanging the messages cyclically with the slave bus devices (16) according to a schedule (22). The object of the invention is to utilize the vehicle communication bus (12) efficiently by means of the master bus device which is controlled by the schedule. To achieve this, the transmitter (20) is designed to receive a diagnosis request signal via a different data input (32) from the bus connection (18) of the master bus device (14) and depending on said diagnosis request signal to interrupt the cyclical processing of the schedule (22) and to exchange at least one special message that is different from the messages defined in the schedule (22) with at least one of the slave bus devices (16). The transmitter then continues the processing of the schedule (22).