Internal Combustion Engine Air System Error Detection
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Solution Overview
Problem
Existing methods for operating internal combustion engines lack effective diagnostic capabilities to identify errors in the air system, relying solely on fuel system adaptations to maintain the air/fuel mixture ratio, which can lead to incomplete compensation for air system issues.
Innovation Solution
Evaluating adaptation values from both fuel injection systems to detect errors in the air system, forming precontrol values for air system variables to directly address deviations, and implementing these values through a control unit to improve the air/fuel mixture ratio regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate adaptation values are used for different fuel injection systems to accurately activate fuel systems, then fuel system control precision is improved, but diagnostic capability for air system errors remains insufficient
Solution Approach 1:
The patent applies feedback by evaluating adaptation values from multiple fuel injection systems to detect air system errors. The control unit continuously monitors adaptation values and uses this feedback information to identify deviations indicating air system problems, thereby resolving the contradiction between fuel control precision and air system diagnostic capability.
Solution Approach 2:
The adaptation values serve as intermediaries that indirectly indicate air system errors. By comparing adaptation values from different fuel injection systems, the control unit can detect air system issues without directly measuring air system parameters, thus enabling air system error detection while maintaining fuel system control precision.
2Ease of operation
If only fuel system variables are influenced to compensate for air system errors, then fuel injection control is simplified, but air system errors cannot be directly addressed
Solution Approach 1:
The patent segments the control approach into two independent paths: one for fuel system control and another for air system control. By forming separate precontrol values for air system variables and fuel system variables, the system can independently manage both systems, allowing direct addressing of air system errors while maintaining simplified fuel injection control through dedicated adaptation values for each fuel injection system.
Data Source
AI summary
A method for operating an internal combustion engine having a first fuel injection system for injecting fuel into a combustion chamber of a cylinder of the internal combustion engine, and having a second fuel injection system for intake manifold injection, an injected fuel mass being corrected for the adaptation of an air/fuel mixture ratio; and at least one first adaptation value for the first fuel injection system being used and at least one second adaptation value for the second fuel injection system being used. The first and the second adaptation value are evaluated in order to conclude whether there is an error in an air system of the internal combustion engine.