Engine Charge Cycle Diagnosis Using Torque Dropout Windows
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Solution Overview
Problem
Current diagnostic systems for internal combustion engines face challenges in accurately identifying the causes of rough engine running and misfiring, particularly in distinguishing between mechanical and gas charging issues, making it difficult to provide effective remedies during workshop visits.
Innovation Solution
A method and diagnostic tool that determine a diagnosis time window within a torque dropout of the engine's stroke, identify cylinders in compression, and assign deviation types based on rotational speed development to pinpoint faults causing rough engine running and misfiring, using charge exchange characteristic variables to differentiate between mechanical friction, cylinder charging, and air path issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If present diagnostic systems are used to diagnose charge exchange behavior, then various items of information from different subsystems are required, but the diagnostic complexity increases and accurate first diagnosis becomes difficult to achieve
Solution Approach 1:
The invention extracts and isolates the specific diagnostic task of charge exchange behavior analysis from the complex multi-subsystem diagnostic process. By focusing solely on rotational speed development during diagnosis time windows and comparing it against predetermined patterns, the system extracts only the necessary information needed for this specific diagnosis, eliminating the need to process information from multiple other subsystems.
Solution Approach 2:
The diagnostic process is segmented into discrete, manageable components: identifying diagnosis time windows, detecting rotational speed development patterns, comparing against predetermined peculiarities, and assigning deviation types. This segmentation transforms the complex continuous diagnostic problem into discrete steps that can be executed systematically with simplified logic.
2Measurement precision
If comprehensive diagnostic information from multiple subsystems is collected, then diagnosis accuracy may improve, but the time required for diagnosis increases
Solution Approach 1:
The system performs preliminary actions by pre-calculating and storing predetermined peculiarities of rotational speed development for various fault conditions. During actual diagnosis, the system only needs to compare measured rotational speed data against these pre-prepared patterns, eliminating the need for complex real-time analysis of multiple subsystems and significantly reducing diagnosis time.
Solution Approach 2:
The invention changes the diagnostic parameter from collecting multiple types of subsystem information to focusing exclusively on rotational speed development characteristics. By transforming the diagnostic approach to monitor only rotational speed patterns during specific time windows and comparing these patterns against predetermined thresholds and peculiarities, the system achieves fast and accurate diagnosis with minimal data processing.
Data Source
AI summary
A method and diagnostic tool diagnoses a charge cycle behavior of an internal combustion engine with a plurality of cylinders. The method determines a diagnosis time window within a torque dropout of one of the cycles of the internal combustion engine, and associates a deviation type with the diagnosis time window determined.