Lambda Adaptation During Fuel Tank Filter Cleaning
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Solution Overview
Problem
Conventional mixture adaptation methods for internal combustion engines are hindered by the parallelization with fuel tank ventilation filter cleaning operations, leading to corrupted adaptation values due to shared physical input variables, necessitating a reduced database and longer flushing times to prevent filter breakthrough.
Innovation Solution
A method that records operating variables during active filter cleaning operations and updates adaptation parameters post-deactivation, allowing for quasi-parallelization of mixture adaptation and filter cleaning, thereby increasing the database stability and accuracy of mixture deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If mixture adaptation is carried out during active filter cleaning operation, then the database for adaptation is increased, but the adaptation values are corrupted due to shared physical input variables
Solution Approach 1:
The patent segments the adaptation process into two distinct phases: data collection phase (during filter cleaning) and data processing phase (after filter cleaning). Operating variables are collected during filter cleaning operations but the actual adaptation calculation is postponed until after the filter cleaning completes, preventing corruption of adaptation values while still utilizing the additional data
2Reliability
If filter cleaning operation is extended to prevent breakthrough, then filter reliability is improved, but mixture adaptation database is reduced
Solution Approach 1:
The patent performs preliminary data collection during the filter cleaning operation without executing the adaptation calculation. Operating variables are stored in memory during the extended filter cleaning period, and the adaptation is calculated afterward when the filter is clean, thus maintaining filter reliability while still gathering sufficient data
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables more stable and accurate mixture adaptation by averaging out errors introduced during filter cleaning, allowing for a larger database and improved fuel-air ratio management, even during active filter cleaning phases.
Implementation Method 1
The fuel tank ventilation includes an activated carbon filter to prevent an escape of gaseous hydrocarbon into the surroundings
Implementation Method 2
a partial vacuum in the intake manifold is used to suction ambient air into the intake manifold through the activated carbon filter
Data Source
AI summary
A method for operating an internal combustion engine. The method includes: operating the internal combustion engine including a lambda regulation, which sets a fuel quantity to be supplied in accordance with a predefined setpoint lambda value, at preset times, carrying out a filter cleaning operation for a fuel tank ventilation, as a function of the presence of a release condition of the internal combustion engine, carrying out an adaptation of the lambda regulation by adapting at least one adaptation parameter as a function of operating variables of the internal combustion engine, at active filter cleaning operation and upon the presence of the release condition, operating variables which are required to carry out the adaptation of the lambda regulation being recorded, at deactivated filter cleaning operation and presence of the release condition, the adaptation of the lambda regulation being carried out as a function of the recorded operating variables.