Cold Start Split Injection Control for Emission and Diagnostic Trade-offs
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Solution Overview
Problem
Current cold start split injection control technologies fail to meet malfunction diagnostic regulations for triple or more split injections during cold start conditions, necessitating a solution that can effectively diagnose and manage injector operations to comply with tightening emission regulations.
Innovation Solution
A cold start split injection control method and engine system that utilize a split injection controller to measure and analyze injector opening angle, operating time, and number of operations, determining malfunction through index estimation values and thresholds, thereby implementing a malfunction diagnostic and extending split injection control to the cold start region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If cold start split injection control is applied to reduce emission, then emission reduction performance is improved, but malfunction diagnostic capability deteriorates due to lack of diagnostic regulations for triple or more split injections
Solution Approach 1:
The injection process is segmented into multiple separate injection events (triple split injection) instead of a single injection. This segmentation allows for better control of fuel delivery during cold start conditions while enabling diagnostic monitoring of each injection event separately through measurement of injection parameters such as injection time, injection angle, and number of injection times.
Solution Approach 2:
The system implements feedback by measuring injection parameters (injection time, injection angle, number of injection times) during triple split injection events and using these measurements to determine whether the injection system is functioning properly. This feedback mechanism enables malfunction diagnostic capability to be maintained even with complex multi-injection patterns.
2Object-generated harmful factors
If triple split injection pattern is used to meet emission regulations, then emission reduction performance is improved, but device complexity increases due to multiple injection operations
Solution Approach 1:
The injection control system is designed to perform multiple functions: it executes the triple split injection pattern for emission reduction while simultaneously measuring injection parameters and performing malfunction diagnostics. This multi-functionality reduces the need for separate diagnostic hardware or systems, thereby managing complexity despite the sophisticated injection pattern.
Solution Approach 2:
The injection system performs self-diagnosis by utilizing the same injection parameters (injection time, injection angle, number of injection times) that control the triple split injection pattern to also serve as diagnostic indicators. This self-service approach allows the system to monitor its own operation without requiring additional external diagnostic equipment.
3Stability of the object's composition
If split injection control is extended to cold start region, then combustion stability is improved, but measurement precision requirements increase for injection parameters
Solution Approach 1:
The system performs preliminary measurements of injection parameters (injection time, injection angle, number of injection times) during each injection event in the triple split injection pattern. By collecting and analyzing these measurements in advance, the system can determine malfunction status before it affects combustion performance, thereby maintaining combustion stability during cold start conditions.
Data Source
AI summary
A cold start split injection control method is provided. The method includes a split injection controller which determines cold start conditions of an engine system, an injection mode control which performs a cold start split injection by an operation of an injector and an injection malfunction diagnostic control which performs an injection malfunction diagnostic with any one or more among an injector opening angle, an injector operating time, and the number of injector operation times which are measured through the fuel injection of the injector.