EGR Valve Inhibition During Engine Transition to Prevent Knock
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Solution Overview
Problem
Hybrid vehicle engines with high compression ratios and exhaust gas recirculation (EGR) face issues of knocks or unstable combustion due to large accuracy deviations in EGR rate calculations during working condition transitions, particularly in transient states.
Innovation Solution
A method and apparatus that detect working condition transitions using a control information set to control the EGR valve, prohibiting its action when the engine passes through the EGR working region, thereby stabilizing combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EGR valve is controlled during working condition transitions, then the EGR rate can be optimized for normal operation, but knocks or unstable combustion occur during transient states
Solution Approach 1:
The control system performs preliminary detection of working condition transitions using slope thresholds before EGR valve actuation occurs. By identifying transient states in advance through monitoring changes in rotation speed and load slopes, the system prevents harmful EGR valve actions before they can cause knocks or unstable combustion.
Solution Approach 2:
Instead of allowing continuous EGR valve control and correcting problems afterward, the system inverts the approach by detecting transition stages and actively prohibiting EGR valve action during these critical periods. This reversal of control logic prevents the harmful effects rather than remedying them.
2Productivity
If the EGR valve acts during working condition transition stages, then EGR rate control is maintained, but calculation accuracy deviation increases
Solution Approach 1:
The system performs preliminary detection of transition stages by monitoring slopes of rotation speed and load changes before EGR rate calculation is performed. By identifying transient conditions in advance, the system can flag periods where calculation accuracy would be compromised, allowing for appropriate control adjustments.
Solution Approach 2:
The control system continuously monitors working conditions and provides feedback on transition stage detection. When transitions are detected through slope threshold comparisons, the system feedbacks this information to the EGR control logic, which then adjusts or prohibits valve action to maintain overall system accuracy.
3Adaptability or versatility
If the EGR valve is frequently opened and closed during transitions, then response to changing conditions is achieved, but driving experience deteriorates
Solution Approach 1:
The system performs preliminary detection of transition stages using slope thresholds before EGR valve actuation. By identifying transient states in advance, the system can prohibit unnecessary valve actions that would occur during brief transitions, thereby maintaining adaptability to genuine load changes while eliminating frequent, harmful valve cycling during transient periods.
Data Source
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AI summary
Provided are a method and apparatus for supervising a working condition of an engine, an electronic device, and a storage medium, which belong to the technical field of vehicle engines. The method includes: obtaining a control information set corresponding to the engine; detecting, based on the control information set, whether the engine is in a working condition transition stage to obtain a detection result; and controlling an operating state of an exhaust gas recirculation (EGR) valve of the engine based on the detection result, where the EGR valve is prohibited from acting when the detection result indicates that the engine is in the working condition transition stage and passes through an EGR working region. Thus, when the engine is in the working condition transition stage and passes through the EGR working region, the problem of knocks or unstable combustion of the engine can be avoided since the EGR valve is prohibited from acting, and driving experience can be improved advantageously.