Engine Control Lambda Equalization and Fault Detection
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Solution Overview
Problem
Existing electronic control devices for internal combustion engines in vehicles fail to effectively recognize and correct faults relevant to emissions, particularly during lean operation, which can lead to irregular engine running and non-compliance with emission limits.
Innovation Solution
An electronic control device with an injection quantity correction unit that adjusts the injection quantity of cylinders based on differential adjustment values to maintain a predetermined lambda value, allowing for fault recognition and correction while ensuring homogeneous engine operation and compliance with emission limits, using a lambda probe to monitor and adjust injection quantities to prevent faults such as leaks or restricted injection valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If lambda equalization is performed to maintain homogeneous operation, then engine running stability is improved, but fault detection capability deteriorates
Solution Approach 1:
The patent segments the correction process into two distinct parts: lambda equalization correction values (for maintaining homogeneous operation) and irregular running correction values (for fault detection). By separating these functions and evaluating them independently, the system can maintain stable engine operation while simultaneously detecting faults without one interfering with the other.
Solution Approach 2:
The patent introduces an intermediary evaluation method where correction values are processed through a specific evaluation process that distinguishes between equalization needs and fault indicators. This intermediary layer allows the system to interpret correction values in a way that preserves both engine stability and fault detection capability.
2Object-generated harmful factors
If injection quantity is adjusted to maintain lambda value, then emission compliance is improved, but system complexity increases
Solution Approach 1:
The system uses the existing lambda probe and electronic control unit to perform self-diagnosis and self-correction. The lambda probe provides feedback on air-fuel ratio, and the ECU automatically adjusts injection quantities based on this feedback, enabling the system to maintain emission compliance using its own existing components without requiring additional complex external systems.
Solution Approach 2:
The patent changes the parameter being monitored from raw correction values to evaluated correction values that account for lambda equalization. By transforming the data parameter and evaluating it in a different context, the system can maintain emission compliance through straightforward injection quantity adjustments without requiring complex additional hardware or systems.
Data Source
AI summary
A method for controlling an internal combustion engine of a motor vehicle. The method includes the use of an electronic control device for controlling the internal combustion engine in a motor vehicle, an irregular running determination unit for fault recognition, an injection quantity correction unit, a lambda probe associated with a defined group of cylinders, the injection quantity of a cylinder to be investigated of the defined group is adjusted in the direction of lean by a differential adjustment value associated with an irregular running differential value, and the injection value of at least one of the remaining cylinders, which are associated with the same lambda probe, is correspondingly adjusted in the direction of rich, so that in total a predetermined lambda value of this group of at least approximately 1 is reached.