Particulate Filter Regeneration Control via Exhaust Pressure Monitoring
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Solution Overview
Problem
Existing particulate filter regeneration methods are inefficient, energy-consuming, and complex, often activating regeneration when not necessary, leading to unnecessary energy waste and difficulty in retrofitting vehicles with particulate filter systems.
Innovation Solution
A method that senses exhaust pressure data to determine when to activate regeneration, using average pressure to indicate soot load and exceptionally high instantaneous pressure as a trigger, with a heating device activated only when conditions are favorable for successful combustion, and dynamically adjusting thresholds based on statistical analysis of vehicle data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive regeneration is used with fuel additives to lower burning temperature, then regeneration can occur at lower exhaust gas temperatures, but it is still difficult to reach the required temperature range and regeneration efficiency remains low
Solution Approach 1:
The system performs preliminary assessment of soot load accumulation before initiating regeneration. By monitoring exhaust gas temperature and calculating soot load based on engine operating conditions, the system determines the optimal moment to activate regeneration, ensuring it starts only when necessary and conditions are favorable.
Solution Approach 2:
The regeneration system dynamically adjusts its operation based on real-time conditions. The control unit continuously monitors exhaust gas temperature, soot load, and engine operating parameters, adapting the regeneration timing and duration to match actual vehicle conditions and driving patterns.
2Reliability
If active regeneration with heating devices is used to reach PM burning temperature, then regeneration can be reliably triggered, but energy consumption increases significantly
Solution Approach 1:
The system incorporates feedback mechanisms by continuously monitoring exhaust gas temperature and soot load levels. The control unit uses this feedback to determine when regeneration is necessary and to monitor the regeneration process, activating heating devices only when the assessment confirms that regeneration conditions are met, thereby avoiding unnecessary energy consumption.
Solution Approach 2:
The system changes operational parameters dynamically based on vehicle conditions. Instead of using fixed thresholds, the control unit adjusts regeneration triggers based on varying exhaust gas temperatures, soot accumulation rates, and engine operating conditions, optimizing the balance between reliability and energy consumption.
3Reliability
If regeneration is activated frequently to ensure thorough PM removal, then filter performance is maintained, but unnecessary energy is wasted and system complexity increases
Solution Approach 1:
The control unit performs preliminary calculations of soot load based on engine operating conditions and exhaust gas temperature before triggering regeneration. This preliminary assessment simplifies the decision-making process by providing a clear criterion for when regeneration is necessary, avoiding both premature and delayed activation.
Solution Approach 2:
The system uses readily available sensor data from the vehicle's existing exhaust gas temperature sensor and engine control unit to assess regeneration needs. By leveraging existing vehicle systems and data, the invention minimizes additional device complexity while maintaining reliable filter performance monitoring.
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
Improves regeneration efficiency by reducing unnecessary activations, conserving energy, and simplifying the installation of particulate filter systems in vehicles, allowing for effective regeneration based on actual vehicle conditions and driving habits.
Implementation Method 1
the PM included in the exhaust gas is burned, providing heat to the accumulated PM in such a way that the latter reaches its burning temperature
Implementation Method 2
Thanks to the porosity properties of the SiC, the PM included in the exhaust gas is blocked by the walls of said channels
Data Source
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AI summary
A method for inducing the regeneration of a particulate filter (125) associated with an exhaust gas emitting engine (105) while being operated in a vehicle (100) in variable driving conditions. The method includes turning on, for a time period, a heating device substantially in punctual contact with said filter at its gas entrance. Said turning on of said heating device is subject to the following conditions: i) an average pressure of the exhaust gas at the entrance of the filter is greater than a predetermined value; ii) an instantaneous pressure of the exhaust gas exhaust gas at the entrance of the filter is at a high improbable value. The time period for such heating device to stay turned on is sufficiently long to reach the particulate ignition temperature and for such instantaneous pressure to get from such high improbable value to a significantly lower value. Said average pressure is obtained by averaging a plurality of pressure data sensed at the entrance of the filter.