Fuel Injector Recalibration Frequency Control
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Solution Overview
Problem
The reduction in fuel injection cut-offs due to advanced driving modes in vehicles, such as hybrid vehicles and automatic coasting modes, hampers the optimal execution of fuel injector retiming, as existing methods do not effectively quantify the need for injector resetting and ensure sufficient occurrences without impacting vehicle driving.
Innovation Solution
A method that determines a current kilometric window, target resetting frequency, and average resetting frequency to assess the need for recalibration, ensuring that the current frequency meets the required frequency, thereby optimizing injector readjustment and minimizing vehicle impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If automatic coasting mode or hybrid vehicle features are implemented to improve fuel efficiency, then fuel injection cut-offs become less frequent, but fuel injector recalibration opportunities are reduced
Solution Approach 1:
The system performs preliminary assessment of recalibration needs by monitoring injection parameters and detecting deviations from nominal values during normal operation. This allows the system to proactively identify when recalibration is needed and schedule it during the next appropriate injection cut-off event, ensuring recalibration occurs without waiting for frequent natural opportunities.
Solution Approach 2:
The system continuously monitors fuel injection parameters and compares them against nominal values to detect deviations. This feedback mechanism triggers recalibration needs to be flagged and pursued during subsequent injection cut-off events, ensuring that recalibration occurs based on actual performance degradation rather than fixed schedules.
2Productivity
If fuel injector recalibration is performed frequently to maintain optimal performance, then combustion efficiency is improved, but vehicle operation is impacted more often
Solution Approach 1:
The system monitors injection parameters in real-time and only triggers recalibration when actual deviations from nominal values exceed thresholds, rather than performing recalibration on fixed schedules. This feedback-based approach ensures recalibration occurs only when necessary to maintain combustion efficiency.
Solution Approach 2:
The system changes the monitoring parameters from fixed-time intervals to performance-based triggers. By detecting actual parameter deviations (such as injection quantity or pressure variations) rather than relying on time-based schedules, the system adapts recalibration frequency to actual performance needs.
Data Source
Figure 1
AI summary
The invention relates to a method for performing a recalibration of at least one injector in a vehicle engine, the recalibration requiring an injection cut-off for its execution, characterized in that: (1) a current mileage window to be covered is determined, (2) a target recalibration frequency is determined, (3) an average recalibration frequency is determined over all the windows covered, based on the target frequency and the average recalibration frequency over all the windows covered, (4) a required recalibration frequency is determined for the current window to be covered, (5) the current recalibration frequency is determined throughout the current window, (6) this current recalibration frequency is compared to the required recalibration frequency, and (7) a need to perform a recalibration is determined when the current recalibration frequency is lower than the required recalibration frequency.