Fuel Injection Control Device Dynamic Conduction Time Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel injection control systems lack a lower limit for conduction time, leading to potential misfires due to insufficient actuating force for valve opening during partial lift injection, and adjusting this limit is challenging due to variations caused by aging fuel injection valves.
Innovation Solution
A fuel injection control device that calculates and sets a command conduction time for partial lift injection, adjusts the lower limit time based on the deviation between actual and requested injection quantities, and uses detection units to estimate actual injection quantities, thereby optimizing the conduction time to prevent misfires while minimizing the injection quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the conduction time is reduced excessively during partial lift injection, then the minimum injection quantity is reduced, but the electric actuator may not be able to exhibit sufficient actuating force for shifting the valve body, causing misfire
Solution Approach 1:
The lower limit time is dynamically adjusted based on detected valve characteristics. The control device learns the actual valve opening characteristics and modifies the lower limit time accordingly, transforming a static safety margin into a dynamic parameter that adapts to individual valve variations and aging, thereby preventing misfire while enabling minimal injection quantities.
Solution Approach 2:
The invention changes the parameter of lower limit time based on detected valve characteristics and aging. By modifying this critical timing parameter according to actual valve performance, the system optimizes the balance between achieving minimal injection quantities and maintaining sufficient actuating force to prevent misfire.
2Reliability
If a fixed lower limit time is set to prevent misfire, then the reliability is improved, but the minimum injection quantity cannot be minimized due to excessive safety margin
Solution Approach 1:
The control device incorporates feedback mechanisms that detect actual valve opening characteristics, timing, and duration. This detected information is fed back to adjust the lower limit time, creating a closed-loop system that continuously optimizes the balance between misfire prevention and minimal injection quantity based on real valve performance.
Solution Approach 2:
The system performs self-learning and self-adjustment by detecting its own valve characteristics and automatically modifying the lower limit time accordingly. This self-service approach eliminates the need for manual calibration and enables the system to adapt to aging and individual variations autonomously.
3Productivity
If the lower limit time is adjusted manually to optimize injection quantity, then the productivity is improved, but the device complexity increases due to calibration requirements
Solution Approach 1:
The control device automatically detects valve characteristics and adjusts the lower limit time without requiring manual calibration or intervention. This self-service capability eliminates complex calibration procedures while maintaining optimized injection control, thereby improving productivity without increasing device complexity.
Solution Approach 2:
The system performs preliminary learning of valve characteristics during initial operation or idle periods, preparing the optimized lower limit time settings in advance. This preliminary action ensures that when injection control is needed, the system already has the optimized parameters ready, eliminating the need for time-consuming manual calibration.
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
The system effectively reduces the minimum injection quantity in partial lift injection without increasing the risk of misfires by dynamically adjusting the lower limit time in response to changing injection characteristics, ensuring sufficient actuating force for valve opening.
Implementation Method 1
a fuel injection valve (10) having a valve body (12) to open and close an injection hole (17a) and to inject a fuel, and an electromagnetic coil (13) to operate for valve opening the valve body (12)
Implementation Method 2
a piezoelectric accelerometer (53) to detect an acceleration of the armature (15)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A fuel injection control device has a conduction time calculation unit (S12), a setting unit (S14, S15), a conduction control unit (S16), a detection unit (54), an estimation unit (55), and a changing unit (S47). The conduction time calculation unit calculates a conduction time of an electric actuator corresponding to a requested injection quantity during partial lift injection. The setting unit sets the conduction time as a command conduction time when a conduction time calculated by the conduction time calculation unit is equal to or higher than a lower limit time and sets the lower limit time as a command conduction time when a conduction time is smaller than the lower limit time. The conduction control unit energizes an electric actuator on the basis of a command conduction time set by the setting unit. The detection unit detects a physical quantity having a correlation with an actual injection quantity during partial lift injection. The estimation unit estimates an actual injection quantity on the basis of a detection result of the detection unit. The changing unit changes a lower limit time on the basis of a deviation between an estimated actual injection quantity and a requested injection quantity.