Fuel Injector Coupler Refilling via Return Pressure
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Solution Overview
Problem
Hydraulic couplers in piezoelectrically driven fuel injectors often become partially or completely emptied, leading to impaired injector function, engine misfires, and non-starters due to air accumulation, which complicates fault localization and requires costly replacement of injectors.
Innovation Solution
A method involving a pressure generator connected to the return line of the fuel injector to generate increased return pressure, allowing for refilling of the coupler and checking the tightness of the injector and return system, thereby restoring injector function without the need for spare parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupler space is not completely filled with fuel and air cushion accumulates, then the injector function is impaired and injection volume is reduced, but replacing injectors with spare parts is time-consuming and costly
Solution Approach 1:
The system uses its own feed pump and fuel supply to refill the coupler space, eliminating the need for external refilling equipment or injector replacement. The injector serves itself by utilizing existing system components to restore proper fuel filling in the coupler space.
2Reliability
If the coupler space is not completely filled with fuel and air cushion accumulates, then the injector function is impaired, but exchanging injectors increases cost and complexity
Solution Approach 1:
The system monitors the coupler filling status and provides feedback through the refilling process. By observing whether the coupler fills properly using the existing feed pump and fuel supply, the system can identify faults in the return system or pressure control valve without complex diagnostic equipment.
3Reliability
If pressure generator is used to generate return pressure for refilling coupler, then injector function is restored, but additional equipment is required
Solution Approach 1:
The system uses its own feed pump and fuel supply to refill the coupler space, eliminating the need for external refilling equipment or injector replacement. The injector serves itself by utilizing existing system components to restore proper fuel filling in the coupler space.
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 method quickly and cost-effectively restores injector function, simplifies fault isolation, and reduces the time and expense associated with replacing injectors by ensuring optimal return pressure and detecting defects in the return system.
Implementation Method 1
The pressure generator generates the increased pressure in the return line by compressing a gas, in particular air
Implementation Method 2
An incompressible volume of liquid in the coupler space then enables the force to be transmitted from the actuator to the switching valve of the injector
Data Source
Figure 1
Figure 2
AI summary
A method for refilling an emptied hydraulic coupler of a fuel injector (30) has the steps: connecting a pressure generator (36) to a return line (32) of the fuel injector (30); operating the pressure generator (36) in order to generate a return pressure in the return line (32); operating the fuel injector (30). The method may also include the step of monitoring the pressure level in the return line.