Diesel Exhaust Fluid Level Sensor Key-Off Monitoring
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Solution Overview
Problem
Current monitoring systems for diesel exhaust fluid (DEF) in selective catalytic reduction (SCR) systems are unable to consistently monitor the storage tank during key-off timeframes, leading to unnecessary deterioration and increased costs due to frequent detection cycles and exposure to non-urea fluid injection prevention systems.
Innovation Solution
A system comprising a storage tank, fluid level sensor, controller, and power source that can monitor DEF levels during key-off states using a low power circuit, transmitting power to the controller and fluid level sensor to verify fluid quality upon key-on, ensuring consistent monitoring and reducing unnecessary system activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current monitoring systems continuously monitor DEF concentration during operation, then quality detection capability is maintained, but detection systems deteriorate faster due to increased cycles
Solution Approach 1:
The monitoring system performs DEF concentration detection only at key-on events and key-off events, rather than continuously during operation. This periodic monitoring approach maintains quality detection capability while significantly reducing the number of detection cycles, thereby extending detection system lifespan and reducing deterioration.
2Reliability
If monitoring systems check DEF concentration at every key switch event and storage tank fill event, then quality detection requirements are met, but system complexity and cost increase
Solution Approach 1:
The monitoring system uses a single integrated approach that handles multiple detection scenarios (key-on events, key-off events, storage tank fill events) through one unified control logic. This multi-functional design meets all quality detection requirements without requiring separate subsystems, thereby reducing overall system complexity while maintaining compliance.
3Reliability
If the system monitors DEF tank during key-off state, then consistent monitoring is achieved, but power consumption increases
Solution Approach 1:
The system activates monitoring only during key-on and key-off transition events, rather than maintaining continuous monitoring during key-off state. This event-driven periodic monitoring achieves consistent quality detection while minimizing power consumption by keeping the monitoring system dormant during steady key-on operation.
Data Source
AI summary
A reduction device includes a housing defining an input chamber configured to receive exhaust from a power source, an output chamber, an exhaust channel configured to direct the exhaust from the input chamber to the output chamber, and a longitudinal axis. The reduction device also includes a treatment unit disposed in the exhaust channel and along the longitudinal axis. The treatment unit is configured to at least partly remove pollutant species from the exhaust. The reduction device also includes an attenuation component disposed in the housing and radially outward of the treatment unit. The attenuation component is fluidly connected to the exhaust channel, and is configured to attenuate a range of frequencies corresponding to operation of the power source. Additionally, the exhaust channel prohibits exhaust entering the input chamber from exiting the housing without passing through the treatment unit.