Internal Combustion Engine Emission Check Control
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Solution Overview
Problem
Internal combustion engines face challenges in efficiently operating emission reduction systems, particularly in detecting errors and determining idle times for effective pollutant reduction, leading to potential increased pollutant generation during system checks.
Innovation Solution
A method and device that control the combustion process in internal combustion engines to check the emission reduction system, including monitoring the exhaust gas catalyzer's oxygen storage capability, determining idle time using temperature differences, and deactivating system checks if the idle time is less than a predetermined repair time to minimize pollutant generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the emission reduction system is checked frequently to ensure proper functionality, then the reliability of pollutant reduction is improved, but the pollutant generation during check periods increases
Solution Approach 1:
The system performs periodic checks of the emission reduction system at predetermined intervals rather than continuous monitoring. The control device determines whether to execute a check based on elapsed time since the last check, creating a periodic action pattern that balances reliability with reduced pollutant generation during non-check periods
Solution Approach 2:
The system determines the need for a check in advance by monitoring elapsed time and comparing it to predetermined intervals. This preliminary determination allows the system to prepare for checks at optimal moments rather than reacting to system failures, ensuring reliability while minimizing unnecessary check operations that generate pollutants
2Measurement precision
If the combustion process is controlled to check the emission reduction system, then the monitoring precision of the catalyzer is improved, but the pollutant generation during checking increases
Solution Approach 1:
The system applies partial action by controlling the combustion process to create specific exhaust gas conditions (rich or lean operation) only during check periods rather than continuous control. This temporary adjustment of combustion parameters enables precise catalyzer monitoring while limiting the duration and impact of increased pollutant generation to only when necessary for accurate measurement
3Speed
If the system checks the emission reduction system in every driving cycle, then the detection speed of errors is improved, but the device complexity and operation complexity increase
Solution Approach 1:
Instead of checking in every driving cycle, the system implements periodic checks at predetermined intervals. The control device tracks elapsed time and executes checks only when the interval is reached, reducing the frequency of complex check operations while maintaining adequate error detection speed through strategically timed monitoring
Solution Approach 2:
The system performs preliminary assessment by monitoring whether the predetermined time interval has been reached before initiating a check. This preliminary time-based determination simplifies the decision-making process and reduces operational complexity by eliminating the need for continuous complex evaluations in every driving cycle
Data Source
AI summary
During a first driving cycle, a combustion process is controlled in at least one combustion chamber for the purpose of performing a check on an emission reduction system of an internal combustion engine. During a second driving cycle following the first cycle, a check is performed to establish whether an error in the emission reduction system was detected during the first cycle. An idle time between the first and the second cycles is determined, in the event of an error of the emission reduction system detected during the first cycle. During the second cycle, the combustion process in the at least one combustion chamber is only controlled for the purpose of the check on the emission reduction system, in the event of an error detected in the emission reduction system during the first cycle and in the event of the idle time being longer than a pre-determined repair time.