Injection Device Parameter Determination via Mean Velocity
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Solution Overview
Problem
Existing methods for determining the operating parameters of injection devices in combustion engines are inaccurate, especially at varying engine velocities and injector supply pressures, and are limited to idling conditions, leading to significant errors and inefficiencies.
Innovation Solution
A process that involves selecting an injector, calculating mean velocities, applying adjustable test pulses, and determining parameter values that exceed a threshold, while ensuring stable engine operation, allowing for accurate parameter determination across an extended operating range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional velocity difference methods are used for parameter determination, then the process can be implemented during engine operation, but the measurement precision deteriorates significantly at varying engine velocities and non-idling conditions
Solution Approach 1:
The patent changes the measurement parameter from instantaneous velocity difference to mean velocity difference calculated over a predetermined time period. This transformation makes the measurement less sensitive to transient variations and engine velocity fluctuations, thereby maintaining precision across a broader operating range including non-idling conditions.
Solution Approach 2:
The patent extracts the mean velocity value from the instantaneous velocity signal by averaging over a predetermined time period. This extraction process removes the high-frequency noise and transient effects that cause measurement errors, leaving a stable parameter that accurately reflects the engine state across varying operating conditions.
2Extent of automation
If accelerometer-based methods are used, then continuous velocity measurement is possible, but the measurement precision deteriorates due to sensitivity to vibrations
Solution Approach 1:
The patent replaces the mechanical accelerometer-based measurement system with an electronic control unit that calculates mean velocity from existing engine operation data. This substitution eliminates the mechanical vibration sensitivity of accelerometers while maintaining continuous measurement capability through digital signal processing.
Solution Approach 2:
The patent introduces the mean velocity calculation as an intermediary between the raw velocity signal and the parameter determination process. This intermediary step filters out vibration-induced errors while preserving the essential velocity information needed for accurate injector parameter determination.
3Reliability
If learning processes are performed to adapt control signals to individual injectors, then combustion efficiency is improved, but the complexity of the control system increases
Solution Approach 1:
The patent implements a self-service learning process where the electronic control unit automatically determines individual injector parameters during normal engine operation. The system uses mean velocity difference measurements to autonomously identify optimal control parameters for each injector without requiring external intervention or complex additional hardware, thereby improving combustion efficiency while maintaining relatively simple system architecture.
Data Source
AI summary
A process for determining the operating parameters of an injection device of a combustion engine includes the steps of: (a) selecting an injector to test; (b) calculating a mean velocity associated with a preceding injector arranged before the injector to test; c) applying to the injector to test an injection control signal including at least one test pulse having an adjustable parameter; (d) calculating a mean velocity associated with the injector to test; (e) calculating a difference between the mean velocity calculated in step d) and the mean velocity calculated in step b); (f) repeating steps b) to d) for at least another engine cycle, each time varying the parameter of the test pulse; (g) determining a value of the parameter of the test pulse for which the mean velocity difference exceeds a predetermined threshold; and storing the parameter value.