Internal Combustion Engine Control for Condensed-Water PM Trapping
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Solution Overview
Problem
Existing technologies fail to address the decrease in particulate matter (PM) trap rate due to condensed water accumulation in filters, leading to increased PM release into the air.
Innovation Solution
A control device with a condensed water remaining determination unit and a power suppression control unit that detects condensed water in the filter and reduces engine power to maintain PM trap efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the temperature of exhaust gas is low causing condensed water to remain in the filter, then the filter structure is simple and requires no additional heating components, but the PM trap rate decreases and PM release into air increases
Solution Approach 1:
The patent changes the operating parameters by suppressing engine power when condensed water is detected in the filter. This parameter change prevents conditions that would lead to high PM generation, thereby maintaining PM trap efficiency despite the presence of condensed water in the filter
Solution Approach 2:
The patent implements a feedback control mechanism where the control device monitors the presence of condensed water in the filter and responds by adjusting engine power. This closed-loop feedback ensures that PM release is suppressed by adapting engine operation to the actual filter conditions
2Object-generated harmful factors
If engine power is suppressed to reduce PM generation, then PM release into air is reduced, but engine productivity and output decrease
Solution Approach 1:
The patent applies partial suppression of engine power only when and where needed - specifically when condensed water is detected in the filter. This partial action approach maintains PM control while minimizing the impact on overall engine productivity by not suppressing power continuously or excessively
3Device complexity
If the filter operates with condensed water present, then the device complexity is low with no additional components, but the PM collection efficiency decreases
Solution Approach 1:
The patent introduces an intermediary control mechanism that mediates between the filter operation and PM generation. By monitoring condensed water presence and adjusting engine power accordingly, this intermediary control maintains PM collection efficiency without requiring direct modification of the filter structure or addition of heating components
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
The device effectively suppresses PM release by detecting condensed water and adjusting engine power, ensuring effective PM collection even when water remains in the filter.
Implementation Method 1
a condensed water remaining determination unit configured to determine whether condensed water remains in the filter
Implementation Method 2
a power suppression control unit configured to, when the condensed water remaining determination unit determines that the condensed water remains in the filter, suppress power of the engine body
Data Source
AI summary
A control device for an internal combustion engine controls an internal combustion engine in which filters for collecting PM are provided in an exhaust pipe connected to an engine main body. A control device for an internal combustion engine includes: a condensed water remaining determination unit that determines whether or not condensed water remains in the filter; and a power suppression control unit that suppresses an output of the engine main body when the condensed water remaining determination unit determines that the condensed water remains in the filter as compared with a case where the condensed water does not remain in the filter. The condensed water remaining determination unit determines that the condensed water remains in the filter when the temperature of the exhaust gas that has passed through the filter is lower than a predetermined threshold value related to the temperature of the exhaust gas.