Fuel Injection Valve Actuator Delay Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Accurate control of fuel injection in internal combustion engines is challenging due to variations in actuator delay times, particularly during partial lift operations, which affects the precision of fuel injection amounts.
Innovation Solution
A fuel injection control device that measures the delay time during full lift and uses this measurement to control the valve body during partial lift, employing an energization control unit to determine a correspondence relationship between energization time and fuel injection amount, ensuring accurate fuel injection by ending actuator energization at the appropriate timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fuel injection control is used without accounting for actuator delay variations, then the control system remains simple, but the fuel injection amount precision deteriorates
Solution Approach 1:
The system performs preliminary measurement of the actuator's delay time characteristics during full lift operation. This measured delay time information is stored and subsequently used to compensate for timing errors during partial lift operations, thereby improving fuel injection precision without adding complex real-time measurement systems.
Solution Approach 2:
The system utilizes feedback from the measured delay time characteristics of the actuator to adjust the energization timing. By feeding back the actual delay time information obtained during full lift to the control unit, the system compensates for individual actuator variations during partial lift operations, improving precision while maintaining relatively simple control logic.
2Measurement precision
If actuator energization is extended to account for delay time, then fuel injection timing improves, but energy consumption increases
Solution Approach 1:
The system applies partial energization strategy where the actuator is energized for only the necessary duration required to achieve the desired valve lift, rather than excessive energization. By precisely calculating the required energization time based on the measured delay characteristics, the system avoids unnecessary energy consumption while maintaining accurate timing control.
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 precise control of fuel injection amounts by accounting for individual actuator variations, enhancing the accuracy of fuel injection processes, especially in the boundary region between full and partial lift operations.
Implementation Method 1
an actuator including a driving body configured to drive the valve body of the fuel injection valve in an opening direction and a closing direction of the valve body
Data Source
AI summary
An actuator is energized to cause a valve body of a fuel injection valve to perform fuel injection. The actuator includes a driving body to drive to open and close the valve body. Boundary energization is performed that ends energization of the actuator at a timing when the driving body is moved in an opening direction of the valve body and is assumed to have reached an end of its movement range to measure a relationship between the energization time until the energization ends and the fuel injection amount. A correspondence relationship between the energization time of the actuator and the fuel injection amount is determined by using the measured relationship. An energization time corresponding to a target injection amount is obtained with reference to the determined correspondence relationship. The actuator is energized to cause the fuel injection valve to perform fuel injection.