Solenoid Injector Coil Temperature Determination
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Solution Overview
Problem
Existing methods for determining the temperature of a solenoid injector during the non-injection phase are complex and system-dependent, making it difficult to obtain a reliable temperature estimate that can be extrapolated outside the specific system in which they are applied.
Innovation Solution
A method that powers the solenoid injector coil for a short period, measures the current using a current measurement sensor, and determines the temperature based on this current value, allowing for a reliable temperature estimation independent of the system, using a previously determined period of time associated with the injection phase to account for recent parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal models are applied to determine the temperature of the solenoid injector during the non-injection phase, then a temperature estimate can be obtained, but the model becomes complex and system-dependent, making it difficult to extrapolate outside the specific system
Solution Approach 1:
The invention extracts the temperature determination from complex system-dependent thermal models and isolates it to a simple electrical measurement of the coil resistance. By measuring the electrical resistance of the coil during the non-injection phase and correlating it to temperature through a lookup table or calibration curve, the solution eliminates the need for complex thermal modeling while maintaining temperature estimation accuracy.
Solution Approach 2:
The invention replaces the complex thermal modeling approach (mechanical/physical system) with an electrical measurement approach. Instead of using thermal models that require multiple system parameters, the solution uses electrical resistance measurement of the coil, which is a simpler electrical property that directly correlates with temperature, thereby reducing device complexity.
2Reliability
If the coil is powered for a sufficient period to ensure needle opening, then reliable injection is achieved, but the temperature measurement becomes less accurate as the coil temperature increases during the longer power application
Solution Approach 1:
The invention performs the temperature measurement during the non-injection phase, before the coil is powered for the injection phase. By measuring the coil resistance when the coil is not heated by prolonged power application, the system obtains an accurate baseline temperature measurement that reflects the actual injector temperature without the confounding effect of coil heating during injection.
Solution Approach 2:
The invention uses periodic switching between non-injection and injection phases, utilizing the non-injection phase for temperature measurement and the injection phase for actual injection. This periodic alternation allows the system to repeatedly measure the coil temperature at consistent conditions (when the coil is not heated) while still performing reliable injections when needed.
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 provides a reliable and system-independent temperature estimation for solenoid injectors, avoiding complex modeling and ensuring accurate temperature measurement, even in varying conditions, without requiring new components or integration into specific systems.
Implementation Method 1
measuring at least one value icoil of the current of the solenoid injector coil using a current measurement sensor when the coil is powered, determining a temperature of the solenoid injector from the at least one value icoil of the current of the solenoid injector coil
Data Source
AI summary
Disclosed is a method for determining a temperature of a solenoid injector including a coil and a needle when the solenoid injector is in a non-injection phase, the method being characterized in that it includes the following steps: powering the solenoid injector coil using an electric generator for a period of time tvoltage strictly shorter than a period of time tlim corresponding to a time for which the coil is under power causing the needle to open; measuring at least one value icoil of the current of the solenoid injector coil using a current measurement sensor when the coil is powered; and determining a temperature of the solenoid injector from the at least one value icoil of the current of the solenoid injector coil.