Engine Injector Condition Monitoring Algorithm
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Solution Overview
Problem
Existing internal combustion engines replace injectors based on service life rather than their actual condition, leading to unnecessary replacements and potential inefficiencies.
Innovation Solution
An algorithm stored in the control device calculates the injector's state using input variables and a model, compares it to a target state, and generates a signal indicating changes due to wear, aging, or damage, allowing for condition-based maintenance by determining when replacements are necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If injectors are replaced based on service life without condition monitoring, then maintenance scheduling is simplified, but unnecessary replacements occur and maintenance costs increase
Solution Approach 1:
The system continuously monitors injector state through sensor measurements and feedback loops, comparing actual injector performance against target values. This feedback mechanism enables condition-based maintenance decisions, replacing injectors only when actual degradation exceeds thresholds, thereby avoiding unnecessary replacements while maintaining optimal engine operation.
Solution Approach 2:
The injector monitoring system enables the engine management system to self-assess injector health status through embedded sensors and algorithms. The control device autonomously determines injector state without external intervention, allowing the system to service itself by identifying when injectors require replacement based on actual condition rather than predetermined service intervals.
2Productivity
If injectors are replaced based on service life without condition monitoring, then replacement timing is predetermined, but engine efficiency decreases due to premature replacement
Solution Approach 1:
The system performs preliminary monitoring and assessment of injector condition through continuous sensor measurements and state calculations. By detecting degradation trends before critical failure occurs, the system can plan and schedule replacements at optimal moments, preventing both premature replacement and operation with degraded injectors, thus maintaining engine efficiency while minimizing downtime.
3Measurement precision
If condition monitoring algorithms are implemented, then injector state can be accurately assessed, but control device complexity increases
Solution Approach 1:
The control device is designed to perform multiple functions: it manages standard engine control operations while simultaneously executing injector state monitoring, sensor data processing, and condition assessment algorithms. This multi-functionality consolidates complexity within a single control unit rather than requiring separate dedicated monitoring hardware, thereby achieving precise measurement without proportionally increasing overall device complexity.
Data Source
AI summary
An internal combustion engine is provided. The internal combustion engine includes a control device, and at least one injector for liquid fuel. The injector(s) can be controlled by the control device via an actuator control signal. The injector(s) include an injector outlet opening for the liquid fuel which can be closed by a needle. A sensor is also provided for measuring a measurement variable of the injector(s). The sensor is or can be in a signal connection with the control device. An algorithm is stored in the control device, which algorithm calculates a state of the injector(s) based on input variables and an injector model, compares the state calculated via the injector model with a target state, and produces a state signal in accordance therewith. The state signal is characteristic of a change in the state of the injector(s) that occurs during intended use of the injector(s) and/or an unforeseen change in the state of the injector(s). The input variables include at least the actuator control signal and the measurement values of the sensor. A method for operating such an internal combustion engine and an injector is also provided.