Exhaust Sensor Swap Detection for Particulate Trap
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Solution Overview
Problem
Existing exhaust after-treatment systems for particulate traps can malfunction due to improper installation of temperature sensors, leading to incorrect regeneration control, causing damage or failure of the particulate trap and increased emissions.
Innovation Solution
An exhaust after-treatment system that includes upstream and downstream temperature sensors and a controller to compare their readings, detecting if the sensors are swapped and taking precautions to prevent improper regeneration control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors are installed in the exhaust system, then regeneration control is enabled, but sensor swap due to improper installation causes malfunction
Solution Approach 1:
The controller continuously monitors temperature readings from both sensors and compares them against expected physical relationships (upstream temperature should be greater than or equal to downstream temperature). When the feedback indicates a swap condition, the system detects the error and can take corrective actions such as swapping sensor assignments or alerting the operator, thereby maintaining reliable regeneration control despite installation errors.
2Reliability
If sensor swap detection is added, then system reliability improves, but device complexity increases
Solution Approach 1:
The system performs self-diagnosis by automatically comparing sensor readings against known physical constraints. The controller uses built-in logic to detect swap conditions without requiring external verification systems, thereby improving reliability while adding minimal complexity. The detection mechanism leverages the existing sensor data and simple comparison algorithms already present in the control system.
Data Source
AI summary
An exhaust after-treatment system is disclosed. The system has a particulate trap disposed to remove particulate matter from an exhaust flow of an engine, an upstream temperature sensor disposed to measure a temperature of the exhaust flow upstream of the particulate trap, and a downstream temperature sensor disposed to measure a temperature of the exhaust flow downstream of the particulate trap. The system also has a controller in communication to receive from the upstream and downstream temperature sensors indications of the upstream and downstream temperatures. The controller is configured to compare the upstream and downstream temperatures, determine if the upstream and downstream temperature sensors are improperly swapped based on the comparison, and take a precaution if it is determined that the upstream and downstream temperature sensors are improperly swapped.