Broadband Lambda Sensor Short-Circuit Line Assignment
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Solution Overview
Problem
Broadband lambda sensors in internal combustion engines experience short-circuits, leading to incorrect oxygen content measurements and inefficient combustion processes, making it difficult to identify and assign the affected sensor line, resulting in excess fuel consumption and non-compliance with emission regulations.
Innovation Solution
The method involves connecting sensor lines of a broadband lambda sensor to a reference potential via a limiting resistor, allowing for the identification of non-short-circuited lines and subsequent assignment of short-circuits to specific sensor lines by comparing potentials using comparators, enabling direct or indirect short-circuit detection and simplifying repair processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensor lines are used in a broadband lambda sensor, then the functionality and measurement capability are improved, but the difficulty of identifying and assigning short-circuits to specific lines increases
Solution Approach 1:
The patent applies segmentation by dividing the diagnostic process into individual steps for each sensor line. Each line is tested separately by connecting it to a reference potential through a limiting resistor, allowing the short-circuit to be identified and assigned to a specific line rather than treating all lines as a single system.
Solution Approach 2:
The patent introduces an intermediary component - the limiting resistor - that connects each sensor line to a reference potential. This intermediary allows for controlled testing of each line's electrical state, enabling the detection of short-circuits without directly exposing the sensitive sensor elements to potentially harmful test conditions.
2Measurement precision
If sensor lines are connected to reference potential via limiting resistor, then short-circuit detection capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing an evaluation circuit that can perform multiple functions: normal sensor operation and short-circuit diagnostics. The same hardware components (limiting resistors, reference potential terminal) serve both the operational function of signal conditioning and the diagnostic function of short-circuit detection, eliminating the need for separate dedicated diagnostic hardware.
Solution Approach 2:
The patent implements self-service by enabling the sensor system to diagnose its own faults using its own components. The evaluation circuit uses the existing sensor lines, limiting resistors, and reference potential to automatically detect and identify short-circuits without requiring external diagnostic equipment or complex additional circuitry.
3Ease of repair
If short-circuit assignment to specific sensor lines is implemented, then repair time and costs are reduced, but the ease of operation during diagnostics is reduced
Solution Approach 1:
The patent applies feedback by providing clear diagnostic information about the electrical state of each sensor line. The evaluation circuit monitors the current flow through each limiting resistor and provides feedback signals that indicate whether a short-circuit is present on each line, enabling systematic identification and assignment of faults to specific lines.
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
This method effectively identifies and assigns short-circuits to specific sensor lines, facilitating quicker repairs and reducing costs by ensuring accurate oxygen content measurements and compliance with emission regulations.
Implementation Method 1
connecting at least one sensor line of a broadband lambda sensor via a limiting resistor to a reference potential applied to a reference potential terminal
Implementation Method 2
the sensor line potential resulting on the at least one sensor line to be checked can be compared to the reference potential, on the one hand, and the short-circuit potentials, on the other hand
Data Source
AI summary
A method for line assignment of a short-circuit of a broadband lambda sensor having an upper or a lower short-circuit potential, wherein the broadband lambda sensor has a sensor and multiple sensor lines. The method comprises establishing a conductive connection of at least one sensor line of the multiple sensor lines via a limiting resistor to a reference potential; comparing a sensor line potential of at least one sensor line to be checked of the multiple sensor lines to the reference potential or the short-circuit potentials; classifying (105) the at least one sensor line to be checked as not short-circuited with the upper or the lower short-circuit potential if it is established upon the comparison that the at least one sensor line potential is inside the reference potential range or if it is outside the short-circuit potential ranges; and assigning the short-circuit to at least one sensor line not classified as not short-circuited.