Adaptive Transition Compensation Using Lambda Sensor Feedback
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Solution Overview
Problem
Existing methods for transition compensation in internal combustion engines are costly, time-consuming, and complex, as they require frequent adaptation to account for changes in fuel quantity due to factors like intake pipe impurities, leading to potential misfires and increased emissions.
Innovation Solution
A method that uses lambda sensor data to detect fuel quantity deviations by injecting test fuel quantities into intake pipes, allowing for adaptive transition compensation without additional detection arrangements, and generating an engine characteristics map to correct fuel injection for various operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transition compensation is frequently adapted to account for changes in fuel quantity due to intake pipe impurities, then measurement precision and reliability improve, but device complexity and time consumption increase
Solution Approach 1:
The patent implements a feedback mechanism where the lambda sensor continuously monitors the actual air-fuel ratio and compares it with the target value. Based on this feedback, the control unit dynamically adjusts the transition compensation values to maintain optimal fuel quantity, thereby improving measurement precision without requiring complex additional hardware
Solution Approach 2:
The system uses existing engine components (lambda sensor, control unit, fuel injectors) to perform self-diagnosis and self-adjustment of fuel quantity compensation. The lambda sensor data is reused for both emission control and fuel quantity verification, eliminating the need for separate detection arrangements and reducing device complexity
2Reliability
If transition compensation is frequently adapted to account for changes in fuel quantity, then reliability improves, but loss of time increases
Solution Approach 1:
The patent enables continuous monitoring of fuel quantity deviations through the lambda sensor during normal engine operation. The control unit continuously processes lambda values and adjusts transition compensation in real-time, ensuring reliable engine operation without requiring periodic shutdowns or separate testing phases for adaptation
Solution Approach 2:
The system performs preliminary verification of fuel quantity using lambda sensor data before actual combustion occurs. By detecting deviations early in the intake stroke and adjusting compensation accordingly, the system prevents misfiring and maintains reliability without time-consuming post-combustion adjustments
3Measurement precision
If additional detection arrangements are installed to measure wall film properties, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent makes the lambda sensor serve multiple functions: it monitors exhaust gas composition for emission control and simultaneously measures fuel quantity deviations caused by wall film effects. This multi-functional use of existing sensor data provides precise fuel quantity measurement without requiring additional specialized detection arrangements
Solution Approach 2:
The lambda sensor acts as an intermediary that indirectly measures wall film properties by detecting the effect of evaporating fuel on the air-fuel ratio in the exhaust gas. Instead of directly measuring wall film thickness or composition, the system uses the lambda sensor to detect the resulting fuel quantity changes, simplifying the measurement approach
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
Enables accurate and cost-effective adaptation of transition compensation, ensuring low-emission and uniform engine operation by using existing lambda sensors to measure fuel quantity changes and adjust fuel injection accordingly, reducing the need for expensive and complex recalibration processes.
Implementation Method 1
uses lambda sensor data to detect fuel quantity deviations
Implementation Method 2
fuel deposited on the wall evaporates into the intake pipe, whereby the air-fuel mixture is enriched
Data Source
AI summary
A method for adapting a transition compensation based on a lambda value change for operating an engine, which includes a combustion chamber having a first inlet opening connected to a first intake pipe having a first injector. The chamber includes a second inlet opening connected to a second intake pipe having a second injector. During normal operation, a predetermined fuel quantity is injected, and this quantity includes a first and second fuel quantities to be injected respectively via the first and second openings. In a first step, the first injector remains closed, and in a second step, the first injector is opened again. In the second step, a first test fuel quantity is injected into the combustion chamber via the first opening and a second test fuel quantity is injected via the second opening, the first and second test fuel quantities making up the predetermined fuel quantity.