Injector Control Apparatus Current Profile Feedback
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Solution Overview
Problem
Existing control apparatuses for injectors in internal combustion engines fail to accurately control the time-variation of fuel injection quantities due to variations in current profiles caused by differences in electrical resistance, temperature changes, and injector deterioration, leading to deviations from target injection values.
Innovation Solution
A control apparatus that measures the actual drive current profile and calculates a current difference value to correct the step-up target voltage, adjusting the change rate of the drive current to bring the actual profile closer to a reference profile, ensuring the injector behaves in accordance with a reference time-variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target injection quantity is small, then the injection precision requirement is high, but the variance in current profile has a considerable influence causing deviation from target value
Solution Approach 1:
The control apparatus measures the actual drive current flowing to the injector coil and compares it with a reference current profile. Based on the detected variance in current profile, the control apparatus adjusts the voltage application duration to the injector, creating a closed-loop feedback system that compensates for current profile variations and maintains precise injection quantity control
Solution Approach 2:
The control apparatus dynamically changes the voltage application duration parameter based on the detected current profile variance. By adjusting this temporal parameter, the system compensates for variations in electrical resistance and other factors affecting current profile, thereby maintaining reliable injection control across different operating conditions
2Quantity of substance
If existing control methods correct voltage application duration or target current value, then final injection quantity can match target value, but time-variation in injection quantity cannot match reference time-variation
Solution Approach 1:
The system continuously monitors the actual drive current profile and uses this feedback to adjust the voltage application duration. This real-time feedback mechanism enables control of both the total injection quantity and the temporal distribution of fuel injection, matching both the final quantity and the time-variation profile to reference values
Solution Approach 2:
The control apparatus determines the corrected voltage application duration before actually applying voltage to the injector. By pre-calculating the optimal voltage duration based on predicted current profile characteristics, the system prepares the injection event to achieve both quantity and temporal profile accuracy
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 allows for more precise fuel injection, aligning the time-variation of the injection quantity with the reference, thereby improving fuel delivery to the engine even when the injector deteriorates.
Implementation Method 1
When a voltage is applied to the injector and a drive current flows to a coil, the valve body moves due to an electromagnetic force.
Data Source
AI summary
A control apparatus, which controlling an operation of an injector provided to an internal combustion engine, includes: a voltage application unit applying a voltage raised to have a step-up target value to the injector to open the injector; a current measurement unit measuring a drive current supplied to the injector in response to an application of the voltage; and a calculator calculating a current difference value which indicates a difference between an actually-measured profile and a reference profile. The actually-measured profile indicates a time-variation in an actually-measured value of the drive current, and the reference profile is a profile set in advance. The step-up target value is corrected according to the current difference value that is calculated.