Engine Sensor Adaptation via Alternating Operating Points
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for adapting internal combustion engine sensors and actuators to correct performance quantity deviations often fail to accurately separate additive offset errors from multiplicative slope errors, leading to incomplete or incorrect adaptations, especially when the engine is brought to operating points only once.
Innovation Solution
The method involves alternating between idling and partial load operating points multiple times during a single monitoring operation, allowing for separate adaptation of additive offset and multiplicative slope errors, enabling accurate correction without mutual influence, and allowing for error diagnosis and adaptation without the need for vehicle movement or a chassis dynamometer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the engine is brought to operating points only once for monitoring, then the monitoring operation is completed quickly, but the adaptation accuracy deteriorates because additive offset error and multiplicative slope error cannot be properly separated
Solution Approach 1:
The patent applies periodic action by alternating between different operating points (idling and partial load) multiple times during a single monitoring operation. This periodic switching allows the system to separately learn additive offset error at idling points and multiplicative slope error at partial load points, achieving accurate error separation without requiring multiple separate monitoring operations.
2Measurement precision
If the engine is brought to operating points multiple times for single monitoring operation, then the adaptation accuracy improves, but the monitoring time increases
Solution Approach 1:
The patent merges multiple operating point visits into a single monitoring operation by alternating between idling and partial load points. This combining approach achieves the benefit of multiple adaptations (improved accuracy) while containing the time cost within one monitoring cycle, effectively resolving the contradiction between accuracy and time.
3Device complexity
If additive offset error and multiplicative slope error are learned simultaneously at the same operating point, then the monitoring operation is simplified, but the error separation fails leading to incorrect adaptation
Solution Approach 1:
The patent segments the error learning process into distinct parts: additive offset error is learned exclusively at idling operating points, while multiplicative slope error is learned exclusively at partial load operating points. This segmentation prevents error contamination and ensures accurate separation, while the alternating structure keeps the overall process manageable.
4Measurement precision
If vehicle movement or chassis dynamometer is required for monitoring, then accurate operating points can be achieved, but the ease of operation deteriorates and additional equipment is needed
Solution Approach 1:
The patent enables the monitoring system to perform accurate error adaptation using only the vehicle's own engine operations. By alternating between idling and partial load points that can be achieved through normal vehicle operation, the system eliminates the need for external equipment like chassis dynamometers, making the process self-sufficient and convenient.
Data Source
AI summary
In a method for operating an internal combustion engine, a sensor for detecting and/or an actuator for setting a performance quantity of the internal combustion engine is/are monitored for the presence of a malfunction. Monitoring is performed at a first operating point of the internal combustion engine at a lower load and at an operating point of the internal combustion engine at a higher load. The two operating points are set alternatingly, and at least one of the two operating points is set multiple times for a single monitoring operation.