Fuel Injection Control Device Voltage Cutoff Timing
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Solution Overview
Problem
The existing fuel injection control devices for electromagnetic fuel injection valves face challenges in reducing variations in injection amounts, particularly in the region where the injection amount increases from the minimum injection amount, due to limitations in half lift control methods.
Innovation Solution
A fuel injection control device that adjusts the timing of voltage cutoff to the coils of the fuel injection valves based on the valve closing or opening time, allowing for precise control of the injection amount characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the application time of boosted voltage and low voltage is adjusted in half lift control, then the linearity of injection amount characteristics in the half lift region is improved, but the variation in injection amount becomes large especially in the region where injection amount increases from the minimum injection amount
Solution Approach 1:
The patent changes the voltage cutoff timing parameter based on valve closing time measurements. By adjusting when the voltage to the coil is cut off during the injection process, the system optimizes the magnetic field duration to reduce injection amount variation while maintaining linearity in the half lift region.
Solution Approach 2:
The patent implements feedback control by measuring the actual valve closing time and using this information to adjust the voltage cutoff timing. This closed-loop approach allows the system to compensate for variations in valve response and maintain consistent injection amounts across different operating conditions.
2Reliability
If the voltage cutoff timing is adjusted based on valve closing time, then the variation in injection amount is reduced, but the control complexity increases
Solution Approach 1:
The system uses the valve's own closing time characteristic as the basis for control adjustment. By measuring when the valve naturally closes and using this information to set the voltage cutoff timing, the system achieves precise injection control without requiring external complex control mechanisms or additional hardware.
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 reduces variations in injection amounts and improves the linearity of injection amount characteristics across different fuel injection valves, enhancing the controllability and efficiency of the fuel injection process.
Implementation Method 1
control unit that controls voltages applied to coils of a plurality of fuel injection valves, the coils being adapted for energization
Data Source
AI summary
Provided is a fuel injection control device capable of reducing variations in injection amounts of a plurality of fuel injection valves. Thus, the fuel injection control device of the present invention includes a control unit that controls voltages applied to coils of a plurality of fuel injection valves, the coils being adapted for energization. The control unit performs control such that the voltage being applied to the coil is cut off. The control unit changes a timing at which the cutoff of the voltage to the coil of at least one fuel injection valve is started or a timing at which the cutoff of the voltage to the coil of at least one fuel injection valve is ended, based on a valve closing time until closing of the fuel injection valve is completed or a valve opening time until opening of the fuel injection valve is completed.