Engine Adaptation Value Check for Diagnostic Time Reduction
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Solution Overview
Problem
Current methods for checking the functionality of internal combustion engine systems at the end of the manufacturing assembly line or in repair shops require lengthy adaptation times to accurately determine if a vehicle is free of errors, as they necessitate multiple operating point changes to separate offset and slope errors, prolonging the diagnostic process.
Innovation Solution
A method that involves ascertaining first and second adaptation values at specific operating points, allowing for rapid error recognition by checking offset adaptation values at an idle mode and potentially identifying error types through additional adaptation value assessments at partial load operating points, thereby reducing overall diagnostic time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the engine system is operated at multiple operating points in alternation to increase adaptation accuracy, then the measurement precision of adaptation values is improved, but the loss of time for diagnostic process is worsened
Solution Approach 1:
The adaptation value determination process is segmented into two independent stages: first determining offset adaptation values at idle operating point, then determining slope adaptation values at partial load operating point. This segmentation allows each stage to be completed independently and quickly, avoiding the need to cycle through multiple operating points in alternation, thus reducing diagnostic time while maintaining accuracy.
Solution Approach 2:
The method performs preliminary determination of offset adaptation values at the idle operating point before proceeding to determine slope adaptation values at the partial load operating point. This preliminary action ensures that the more time-consuming slope adaptation is only performed after the quicker offset adaptation is complete, optimizing the overall diagnostic time while maintaining comprehensive measurement precision.
2Ease of operation
If the engine system is operated at idle operating state to learn additive offset adaptation values, then the ease of operation is improved, but the manufacturing precision of fuel metering is worsened when offset adaptation value is not zero
Solution Approach 1:
The control unit continuously monitors the adaptation values and provides feedback to identify when the engine system is operating correctly. By checking both offset and slope adaptation values and comparing them against expected ranges, the system can determine when the fuel metering is accurate and when adjustments are needed, thus maintaining manufacturing precision while keeping the operation simple.
Solution Approach 2:
The method changes the operational parameters by first operating at idle to determine offset adaptation values, then transitioning to partial load operating points to determine slope adaptation values. This parameter change allows the system to separate the effects of offset errors from slope errors, enabling accurate fuel metering verification without complicating the overall operation.
3Measurement precision
If the partial load operating point is maintained long enough to reach steady state, then the measurement precision of slope adaptation value is improved, but the loss of time is worsened
Solution Approach 1:
Instead of maintaining the partial load operating point for an extended period to ensure complete steady state, the method uses a reduced approach by operating at this point for a shorter, predetermined period sufficient to obtain reliable slope adaptation values. This partial action is justified by the fact that multiple alternations between operating points have been performed, which adequately separates offset and slope error effects, thereby achieving the necessary measurement precision without the full time investment.
Data Source
AI summary
A method for checking the function of an engine system having an internal combustion engine includes: (a) ascertaining a first charge adaptation value for acting on a manipulated variable for setting an air supply to the internal combustion engine, and ascertaining a first mixture adaptation value for acting on a manipulated variable for setting a fuel supply at a predefined first operating point of the internal combustion engine, in each case with the aid of a predefined adaptation method; and (b) establishing that an error is present in the engine system when at least one of the offset adaptation values is outside a particular predefined adaptation value range.