Engine Diagnostic System Fuel Injection Anomaly Detection
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Solution Overview
Problem
Conventional engine diagnostic systems face challenges in accurately detecting hardware anomalies, often resulting in false outputs and uncertainty about the failing component when engine knock or misfire occurs, which can affect engine performance and drivability.
Innovation Solution
A method and system that control a fuel injector to inject different quantities of fuel into engine cylinders, detect corresponding parameter values, and compare them to identify hardware anomalies, using a controller and sensor network to differentiate between normal and abnormal conditions, including faulty sensors and injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional knock detection systems are used to detect engine knock, then engine knock can be detected, but false outputs are generated and uncertainty exists about the failing component
Solution Approach 1:
The diagnostic process is segmented into multiple distinct phases: baseline parameter collection with normal fuel injection, anomaly detection phase with reduced fuel injection, and comparison analysis. This segmentation allows the system to isolate and identify specific component failures (knock sensor, fuel injector, or true knock condition) by observing parameter changes across phases, thereby resolving the uncertainty about which component has failed.
2Measurement precision
If fuel injection quantity is varied to detect hardware anomalies, then precise anomaly detection is achieved, but additional control operations and time are required
Solution Approach 1:
The system employs periodic action by implementing a baseline collection phase followed by a diagnostic phase with reduced fuel injection, then comparing results. This periodic structure allows precise anomaly detection through controlled parameter variation while managing diagnostic time by using predetermined threshold comparisons rather than continuous monitoring.
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 approach enables precise detection of hardware anomalies, distinguishing between true and false knock or misfire, allowing for targeted repairs and maintaining engine operability by identifying the root cause of issues.
Implementation Method 1
controlling a fuel injector to inject a first quantity of a fuel into a cylinder from a plurality of cylinders, of an engine
Implementation Method 2
The air-and-fuel mixture is combusted within a plurality of cylinders to drive pistons which rotatably turn a crankshaft to produce drive torque
Data Source
AI summary
A method involves controlling a fuel injector to inject a first quantity of a fuel into a cylinder from a plurality of cylinders, of an engine and detecting a first value of a parameter associated with the engine. The method further involves controlling the fuel injector to inject a second quantity of the fuel different from the first quantity of the fuel, into the cylinder of the engine and detecting a second value of the parameter associated with the engine. The method also involves comparing the first value with the second value and detecting a hardware anomaly associated with the engine based on the comparison of the first value with the second value.