Fuel Injector Control Circuit for Injection Quantity Precision
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Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines face challenges in accurately reducing the minimum fuel injection quantity without compromising the maximum injection quantity, particularly in downsized engines where fuel consumption rates need to be optimized.
Innovation Solution
A fuel injection control apparatus that switches from a high-voltage power supply to a low-voltage supply after opening the injector valve, rapidly discharging current to a first level incapable of keeping the valve open and then supplying a second current capable of maintaining the open state, allowing precise control of the injection quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driving pulse Ti is made long to avoid departure from desired injection quantity, then the valve-closing delay is compensated, but the injector valve starts to close before it fully opens when power distribution time is short
Solution Approach 1:
The current supply is divided into three distinct stages: (1) high current to rapidly open the valve, (2) intermediate current to maintain opening while allowing controlled closing preparation, and (3) low current to complete closing. This segmentation allows precise control of the valve lifecycle without requiring excessively long driving pulses.
Solution Approach 2:
The current level is dynamically adjusted over time rather than maintained constant. The control unit varies the current through three stages, adapting the electrical input to the valve's changing state. This dynamic approach enables the valve to open fully and close accurately without requiring the driving pulse to be excessively long.
2Speed
If the power distribution time is shortened to improve response speed, then the valve opens faster, but the injector valve starts to close before it fully opens
Solution Approach 1:
The current supply is divided into three distinct stages: (1) high current to rapidly open the valve, (2) intermediate current to maintain opening while allowing controlled closing preparation, and (3) low current to complete closing. This segmentation allows precise control of the valve lifecycle without requiring excessively long driving pulses.
Solution Approach 2:
The control unit supplies intermediate current level after the initial high current, preparing the valve for controlled closing while ensuring it has fully opened. This preliminary action ensures the valve is in the correct state before the closing phase begins, preventing premature closing.
3Loss of energy
If the minimum fuel injection quantity is reduced to improve fuel consumption rate, then fuel efficiency increases, but the dynamic range of the fuel injector is compromised
Solution Approach 1:
The current level is dynamically adjusted over time rather than maintained constant. The control unit varies the current through three stages, adapting the electrical input to the valve's changing state. This dynamic approach enables the valve to open fully and close accurately without requiring the driving pulse to be excessively long.
Solution Approach 2:
The patent changes the current parameter through three distinct levels (high, intermediate, low) during the valve operation cycle. By varying the current parameter dynamically, the system achieves precise control of both minimum and maximum injection quantities, maintaining a wide dynamic range while reducing minimum injection quantity for improved fuel efficiency.
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 enables a reduction in minimum fuel injection quantity while maintaining the maximum injection quantity, improving the dynamic range of fuel injection and reducing valve-closing delays, thus enhancing engine performance and fuel efficiency.
Implementation Method 1
The fuel injector opens or closes its valve, part of the injector, by utilizing the magnetic force generated by the flow of current through a solenoid
Implementation Method 2
the current is rapidly discharged to reduce the current to a first current incapable of keeping the valve open or below
Implementation Method 3
a second current capable of keeping the valve open is then supplied to the fuel injector
Data Source
AI summary
A fuel injection control apparatus is capable of reducing a minimum quantity of fuel injection without reducing a maximum quantity of injection. To open a fuel injector valve, a driving circuit supplies an electric current from a high-voltage power supply to the fuel injector. Then, after valve opening, the high-voltage power supply is switched to a low-voltage power supply, and an open state of the valve is retained. For opening the valve of the fuel injector, a microcomputer, after supplying current from the high-voltage power supply to the injector, discharges the current rapidly for a decrease below a first current level at which the open state of the valve cannot be retained. The microcomputer then controls the supply current to the injector so as to supply a current at a second current level at which the open state of the valve can be retained.