In-Vehicle Relay Amplifier Fault Diagnosis via Trigger Signals
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Solution Overview
Problem
In in-vehicle mobile communication systems, the introduction of a relay amplifier between the in-vehicle terminal and the antenna complicates fault diagnosis, as the in-vehicle terminal cannot continue to perform fault diagnosis through direct current voltage division.
Innovation Solution
The in-vehicle terminal negotiates with the relay amplifier to initiate a fault diagnosis, and after a start moment, the relay amplifier sends a fault code to the in-vehicle terminal, allowing the terminal to perform fault diagnosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay amplifier is added between the in-vehicle terminal and the antenna to compensate for cable loss, then the signal transmission quality is improved, but the fault diagnosis capability is lost
Solution Approach 1:
The fault diagnosis process is segmented into two independent parts: (1) the in-vehicle terminal performs voltage division diagnosis on the antenna, and (2) the relay amplifier independently performs self-diagnosis by detecting its own power supply current state. This segmentation allows both components to be diagnosed separately despite being connected in series, resolving the contradiction between adding the relay amplifier and maintaining fault diagnosis capability.
Solution Approach 2:
The relay amplifier performs self-diagnosis by autonomously detecting its own power supply current state and generating fault codes without requiring external diagnosis equipment. The terminal triggers the self-diagnosis by sending a fault diagnosis trigger signal, and the relay amplifier independently completes the diagnosis process, enabling the system to maintain diagnostic capability while using the relay amplifier.
2Length of stationary object
If a relay amplifier is introduced to compensate for long cable loss, then the communication range is extended, but the system complexity increases
Solution Approach 1:
The power supply current detection mechanism serves multiple functions: it monitors the operational state of the relay amplifier for fault diagnosis purposes, and simultaneously provides information about the amplifier's working condition. This multi-functionality reduces the need for separate monitoring systems, thereby limiting the increase in system complexity despite adding the relay amplifier for extended cable length support.
Data Source
AI summary
A fault diagnosis method includes detecting a state of a relay device, sending a fault diagnosis trigger signal to the relay device based on the state to enable the relay device to enter a fault diagnosis mode, where the fault diagnosis trigger signal includes one or more of a variable supply voltage value, a transmit/receive control signal, and a diagnosis control signal, detecting a state of the relay device in the fault diagnosis mode, determining a fault code based on the state, and determining a fault based on the fault code.