Exhaust Gas Sensor Voltage Supply Segmentation
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Solution Overview
Problem
Existing exhaust gas aftertreatment devices in motor vehicles rely on multiple sensors connected to a single voltage supply unit, making it difficult to isolate faulty sensors without affecting the entire system, which can lead to damage and hinder vehicle operation when malfunctions occur.
Innovation Solution
The implementation of independently switchable supply banks for sensors grouped by function allows for selective shutdown of malfunctioning sensor groups, ensuring continued operation of the exhaust gas aftertreatment device and preventing damage by isolating affected components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all sensors are connected to a single voltage supply unit, then the system structure is simple, but a malfunction in one sensor can cause the entire sensor system to fail
Solution Approach 1:
The single voltage supply unit is segmented into multiple independently switchable supply banks, with each supply bank powering a specific group of sensors. This segmentation allows isolated failure containment while maintaining overall system reliability.
Solution Approach 2:
Different supply banks are assigned to different sensor groups based on their specific functions and failure modes. This local differentiation ensures that a malfunction in one supply bank does not affect other sensor groups, providing targeted reliability improvement.
2Ease of repair
If sensors are grouped by function and assigned to separate supply banks, then sensor malfunction isolation is improved, but the voltage supply structure becomes more complex
Solution Approach 1:
The voltage supply structure is divided into multiple independent supply banks, each capable of being switched on or off independently. This segmentation enables precise isolation of malfunctioning sensor groups while maintaining a relatively simple overall architecture.
Solution Approach 2:
The supply banks are designed with dynamic switching capability, allowing the control unit to activate or deactivate specific supply banks based on detected malfunctions. This dynamic control enables flexible malfunction isolation without requiring permanent complex wiring for all sensor combinations.
3Reliability
If the entire sensor system is switched off when a malfunction is detected, then safety is ensured, but the exhaust gas aftertreatment device cannot continue to operate
Solution Approach 1:
The sensor system is segmented into multiple independent supply banks, allowing selective shutdown of only the affected bank while maintaining power to other functional groups. This enables continued operation of non-defective sensors and the exhaust gas aftertreatment device.
Solution Approach 2:
Instead of shutting down the entire sensor system when a malfunction is detected, the system applies partial action by shutting down only the specific supply bank containing the faulty sensor. This partial shutdown maintains sufficient operational capability for the exhaust gas aftertreatment device to continue functioning.
Data Source
Figure 1~2
AI summary
The invention relates to an arrangement (1) for operating an exhaust gas aftertreatment device, in particular of a motor vehicle, having a plurality of active sensors (3-8) and a control device (2) that comprises at least one voltage supply unit (9) to which the sensors (3-8) are operatively connected. According to the invention, the voltage supply unit (9) comprises at least two supply benches (13-15) that can be switched independently from each other. The sensors (3-8) are grouped according to the function thereof and are then associated with one of the supply benches (13-15).