Fuel Injection Valve Control Device for Half-Lift Region
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Solution Overview
Problem
Existing electromagnetic fuel injection valve technologies face challenges in achieving continuous lift quantity adjustment in the half-lift region and maintaining consistent fuel injection quantity relationships between half-lift and full-lift regions, leading to controllability issues with minute fuel injection quantities.
Innovation Solution
A control device that supplies a driving current to the solenoid with a peak current supply period for valve-opening and a lift quantity adjustment period using a current lower than the peak current, allowing control of the valve body lift quantity and actual valve-opening period before reaching full-lift position, thereby improving controllability of fuel injection quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If half-lift control is implemented by fixing valve body lift quantity to two levels (high lift and low lift), then the minimum injection quantity is reduced, but the lift quantity cannot be changed continuously
Solution Approach 1:
The patent applies dynamics by transitioning from fixed two-level lift control to continuous lift quantity adjustment. The control device dynamically varies the lift quantity in the half-lift region based on the injection instruction period, enabling smooth transitions and continuous control rather than discrete steps. This allows the system to adapt to any required injection quantity within the full range.
2Quantity of substance
If the valve body is opened fully and then closed before reaching full-lift state, then the minimum injection quantity is reduced, but the relationship between fuel injection quantity and injection instruction period becomes different from full-lift region
Solution Approach 1:
The patent applies parameter changes by continuously adjusting the lift quantity parameter in the half-lift region based on the injection instruction period. Instead of using a fixed parabolic motion or abrupt closure, the system varies the lift quantity proportionally to the injection instruction period, maintaining a consistent relationship between injection quantity and control parameter across both half-lift and full-lift regions.
3Quantity of substance
If the lift quantity in half-lift region is variably controlled, then the minimum injection quantity is reduced, but the relationship of fuel injection quantity with injection instruction period differs from full-lift region
Solution Approach 1:
The patent applies dynamics by implementing continuous, proportional adjustment of lift quantity in the half-lift region. The lift quantity is dynamically varied in accordance with the injection instruction period, creating a consistent linear relationship between control parameter and injection quantity that matches the full-lift region behavior, thereby ensuring manufacturing precision and control consistency.
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 ensures that the fuel injection quantity relationships in the half-lift and full-lift regions are closer, enhancing the controllability of minute fuel injection quantities and reducing variations between identical fuel injection valves.
Implementation Method 1
supplies a driving current to a solenoid to open a valve body with a magnetic force
Data Source
AI summary
Because the relationship of the fuel injection quantity to a designated injection period differs in a half-lift region and a full-lift region, the purpose of the present invention is to bring the flow rate characteristics of an intermediate-lift region close to the flow rate characteristics of the full-lift region and improve the controllability of small fuel injection quantities. Provided are a peak current supply period in which a valve body of a fuel injection valve causes the magnetic force necessary for a valve-opening action to be generated, and a lift quantity adjustment period in which, after the peak current supply period, a current lower than the peak current is passed for a prescribed period; further provided is a current interrupt period in which a drive current is rapidly lowered before the lift quantity adjustment period.