Engine Fuel Metering Adaptation via Rotational Speed Profile
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Solution Overview
Problem
Internal combustion engines face challenges in achieving precise control of noxious substance emissions and smooth operation due to variations in fuel properties and engine conditions, which existing technologies struggle to address effectively.
Innovation Solution
A method and device for operating an internal combustion engine that adapt the fuel metering based on a rotational speed profile during startup, using a lambda controller to adjust the air-fuel ratio, with intermediate correction values to account for changes in engine conditions, ensuring precise control and reduced emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a lambda controller is used to convert noxious substances, then emissions control is improved, but precise control of air-fuel mixture requires complex adaptation mechanisms
Solution Approach 1:
The patent applies preliminary action by adapting the lambda controller during the startup phase before the engine reaches steady-state operation. The system performs preliminary adaptation of the air-fuel ratio based on rotational speed profile characteristics, allowing the catalytic converter to be effective from the beginning rather than requiring complex continuous adaptation throughout operation.
Solution Approach 2:
The control system is segmented into distinct operational phases: startup phase with rotational speed profile-based adaptation, and steady-state phase with conventional lambda control. This segmentation allows simplified control during startup while maintaining precision during steady-state operation, reducing overall system complexity.
2Object-generated harmful factors
If fuel mass is corrected during startup, then emission control is improved, but control precision is reduced before lambda adaptation
Solution Approach 1:
The patent introduces an intermediary correction mechanism that uses rotational speed profile characteristics as a mediator between the fuel injection system and the lambda controller. During startup, the rotational speed profile serves as an intermediary parameter to estimate fuel properties and adjust air-fuel ratio without requiring direct lambda probe feedback, maintaining precision before conventional adaptation begins.
Solution Approach 2:
The system performs preliminary fuel mass correction during startup based on rotational speed profile analysis before the lambda controller completes its adaptation. This preliminary action ensures emission control is active from the beginning while the lambda system is still calibrating, maintaining acceptable control precision through the intermediary rotational speed-based estimation.
3Device complexity
If lambda adaptation is delayed until steady-state, then control simplicity is maintained, but emission control effectiveness is reduced during transient operation
Solution Approach 1:
The patent applies preliminary action by implementing lambda adaptation during the startup phase before the engine reaches steady-state operation. The system uses rotational speed profile characteristics to perform preliminary air-fuel ratio adjustment, ensuring emission control effectiveness is active from the beginning rather than waiting for steady-state conditions.
Solution Approach 2:
The control system dynamically adjusts the adaptation strategy based on operational phase. During startup, the system uses rotational speed profile-based adaptation; during steady-state, it transitions to conventional lambda control. This dynamic approach maintains emission control effectiveness across all operating conditions while preserving control simplicity through phase-dependent strategies.
Data Source
AI summary
A start quantity adaptation value (ST_AD) is adapted as a function of a variable that is characteristic of a rotational speed profile during the start (ST) of the internal combustion engine. A lambda adaptation value (LAM_AD) is adapted as a function of at least one control parameter (LAM_RP) of the lambda controller if a preset condition (COND) is met, which presupposes the existence of a quasi-stationary operating state. An intermediate correction value (ZW_KOR) is adapted as a function of a change of the start quantity adaptation value (ST_AD) since a last adaptation of the lambda adaptation value (LAM_AD). A fuel mass (MFF) to be metered is determined as a function of at least one operating variable (BG) of the internal combustion engine. The fuel mass (MFF) to be metered is corrected during the start (ST) of the internal combustion engine by means of the start quantity adaptation value (ST_AD). The fuel mass (MFF) to be metered outside of the start (ST) of the internal combustion engine is corrected as a function of the lambda adaptation value (LAM_AD). The fuel mass (MFF) to be metered is corrected as a function of the intermediate correction value (ZW_KOR) until for the first time after the respective start (ST) the lambda adaptation value (LAM_AD) is adapted.