Reductant Delivery System Pressure Control
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Solution Overview
Problem
SCR systems using pressurized air face inefficiencies during low engine loading or extended idling periods due to reduced exhaust gas flow, leading to insufficient pressurized air pressure for reductant injection, rendering the system ineffective.
Innovation Solution
A reductant delivery system that includes a sensor to monitor pressurized air pressure, a controller to increase engine power when pressure is below a desired level, and an auxiliary load to enhance exhaust gas production, ensuring consistent reductant injection by increasing compressor speed and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pressurized air from turbocharger is used to supply reductant, then system complexity is reduced, but pressurized air pressure becomes insufficient during low engine loading
Solution Approach 1:
The system dynamically adjusts engine power output based on real-time pressurized air pressure measurements. When pressure drops below the threshold required for effective reductant injection, the controller increases engine power to restore pressure, ensuring consistent SCR system performance across varying operating conditions.
Solution Approach 2:
A pressure sensor continuously monitors the pressurized air pressure in the storage system and provides feedback to the controller. This closed-loop control enables the system to detect pressure deviations and automatically adjust engine power output to maintain pressure within the required range for reliable reductant injection.
2Reliability
If engine power is increased to maintain pressurized air pressure, then reductant injection reliability is improved, but fuel consumption increases
Solution Approach 1:
The system applies partial action by increasing engine power only to the extent necessary to restore pressurized air pressure to the minimum required level for effective reductant injection. The controller modulates power output based on the degree of pressure deficiency, avoiding excessive power increases that would unnecessarily consume fuel.
Solution Approach 2:
The system changes the engine operating parameters (power output) dynamically in response to pressure conditions. By adjusting engine power as a variable parameter based on real-time pressure feedback, the system maintains the minimum necessary pressure for reliable injection while minimizing fuel consumption during low-loading periods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures consistent reductant injection and maintains the effectiveness of the SCR system by adjusting engine power to meet the required pressurized air pressure, preventing irregular or no injection of the reductant.
Implementation Method 1
a turbocharger with a compressor... configured to receive pressurized air from the compressor
Implementation Method 2
The sensor is configured to determine a pressure of the pressurized air in the storage system
Implementation Method 3
The reducing agent reacts with NOx present in the exhaust gases in the presence of catalyst to convert NOx to N2 and water
Data Source
AI summary
A reductant delivery system for an engine system. The engine system includes an engine having an exhaust conduit and a turbocharger with a compressor. The reductant delivery system having an injector, a storage system, a sensor and a controller. The injector is configured to inject a reductant into the exhaust conduit. The storage system stores the reductant and is configured to receive pressurized air from the compressor. The sensor is configured to determine a pressure of the pressurized air in the storage system. The controller is in communication with the sensor and is configured to increase a power output of the engine in response to the pressure being below a desired pressure.