Injector-Specific Fault Detection via Time-Resolved Accumulator Pressure
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Solution Overview
Problem
Current methods lack a simple and reliable way to perform injector-specific diagnosis in internal combustion engines, making it difficult to detect and identify faults in individual injectors during operation.
Innovation Solution
A method that records and evaluates the pressure profile in an individual injector's accumulator in a time-resolved manner using a pressure sensor, allowing for the identification of fault states and assignment to specific injectors, thereby facilitating the detection of faulty behavior without the need for costly examinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional diagnostic methods are used for fuel injectors, then general system monitoring is possible, but injector-specific fault detection and identification is not achievable
Solution Approach 1:
The patent applies segmentation by dividing the diagnostic function into individual accumulator pressure measurements for each injector. Each injector has its own accumulator with a pressure sensor, enabling independent monitoring of each injector's performance. This segmentation allows precise identification of which specific injector is faulty without requiring complex system-wide diagnostics.
Solution Approach 2:
The patent uses the accumulator as an intermediary element between the injector and the diagnosis system. The accumulator's pressure profile serves as a mediator that translates injector performance into measurable pressure changes. By monitoring the pressure profile in the accumulator during and after injection events, the system can infer injector health and detect faults without directly measuring injector parameters.
2Reliability
If each individual injector is examined to identify faults, then accurate fault identification is possible, but the process becomes costly and time-consuming
Solution Approach 1:
The patent implements preliminary action by continuously monitoring the pressure profile in each injector's accumulator during normal engine operation. This ongoing monitoring prepares the diagnostic system in advance, so when a fault occurs, the system already has data to immediately identify the problematic injector. This eliminates the need for time-consuming sequential examination of each injector when a fault is detected.
3Reliability
If continuous monitoring of all injectors is implemented, then reliable fault detection is achieved, but data processing complexity and resource requirements increase
Solution Approach 1:
The patent extracts only the relevant diagnostic information from the pressure signals by focusing on specific characteristics of the pressure profile (such as pressure changes during and after injection). Instead of processing all raw sensor data, the system extracts key features that indicate injector health, significantly reducing data processing complexity while maintaining high detection reliability.
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 safe and reliable detection of injector-specific faults, reducing the need for extensive troubleshooting and allowing for targeted corrective measures, thus improving diagnostic efficiency and reducing costs.
Implementation Method 1
a pressure profile is recorded in an individual accumulator of an injector in a time-resolved fashion by a pressure sensor which is arranged in the region of the individual accumulator
Data Source
AI summary
A method for the injector-specific diagnosis of a fuel injection device of an internal combustion engine, including the following steps: detecting a pressure progression in an individual accumulator of an injector in a time-resolved manner; evaluating the detected pressure progression; determining if there is a fault state of the injection device in the region of the injector on the basis of the detected and evaluated pressure progression; and identifying the fault state on the basis of the detected and evaluated pressure progression.