Lambda Adaptation Value Segmentation for Engine Emission Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling pollutant emissions in internal combustion engines, such as catalytic converters, require precise air/fuel ratios which are challenging to maintain efficiently, especially across varying engine temperatures and operating conditions.
Innovation Solution
A method and device that adapt Lambda adaptation values based on corrective signals from the Lambda controller, ensuring precise fuel metering by checking and adjusting Lambda adaptation values within valid ranges, particularly during quasi-stationary operating states and temperature changes, using a trust factor to account for uncertainty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Lambda adaptation values are continuously adapted based on corrective signals, then emission control precision is improved, but system complexity and computational load increase
Solution Approach 1:
The patent pre-divides the operating temperature range into multiple temperature ranges before operation, and pre-assigns Lambda adaptation values to each temperature range. This preliminary preparation eliminates the need for real-time complex calculations during operation, reducing computational load while maintaining precision.
Solution Approach 2:
The patent segments the continuous temperature range into discrete temperature ranges (e.g., cold start range, warm-up range, operating range). Each segment has its own Lambda adaptation value, allowing simplified control within each segment while maintaining overall precision across the full operating range.
2Measurement precision
If Lambda adaptation values are adapted for every temperature change, then emission accuracy is improved, but response time and processing delay increase
Solution Approach 1:
By pre-defining temperature ranges and their corresponding Lambda adaptation values before engine operation, the system eliminates real-time decision-making delays. When the engine temperature enters a predefined range, the corresponding pre-calculated Lambda adaptation value is immediately applied, ensuring both accuracy and rapid response.
3Measurement precision
If multiple Lambda adaptation values are stored for different temperature ranges, then control precision across varying temperatures is improved, but memory requirements and data management complexity increase
Solution Approach 1:
The patent divides the temperature operating range into multiple segments, with each segment assigned a single Lambda adaptation value. This segmentation approach provides temperature-dependent precision while keeping the total number of stored values manageable, as only one value per temperature range is needed rather than continuous data.
Solution Approach 2:
The patent changes the control parameter from continuous temperature-based adaptation to discrete temperature-range-based adaptation. By using temperature range boundaries as the controlling parameter instead of continuous temperature values, the system achieves adequate precision across varying temperatures while minimizing the quantity of stored adaptation data.
Data Source
AI summary
For operating an internal combustion engine a respective lambda adaptation value (LAM_AD) assigned to a respective temperature range is adapted as a function of at least one corrective signal proportion of a lambda controller in relation to a control parameter of the lambda controller if a predetermined condition is fulfilled. The respective lambda adaptation value (LAM_AD) is assigned a respective reference temperature If a predetermined test condition is fulfilled, a check is made as to which of the lambda adaptation values (LAM_AD) was adapted as a function of the at least one corrective signal proportion since the test condition was last fulfilled. A respective lambda adaptation value not adapted as a function of the at least one corrective signal is compared to a range of valid values. If it lies outside the predetermined diverging range of valid values, the non-adapted lambda adaptation value (LAM13 AD) is adapted in a defined manner.