Direct Fuel Injector Degradation Mitigation via Port Injector Deactivation
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Solution Overview
Problem
Internal combustion engines with degraded direct fuel injectors experience operational issues, such as knocking at lower engine loads, making it challenging to maintain consistent performance with port and direct fuel injectors. Deactivating a port fuel injector in response to direct fuel injector degradation can help mitigate further degradation and ensure desired engine torque.
Innovation Solution
A method involving a controller that deactivates the port fuel injector of a cylinder with a degraded direct fuel injector, reducing the exposure to higher temperatures and adjusting fuel injection timings and fractions to compensate for the degradation, thereby maintaining engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If both port fuel injector and direct fuel injector are operated simultaneously, then engine torque output is improved, but direct fuel injector degradation accelerates
Solution Approach 1:
The system dynamically switches between different fuel injection modes (port injection only, direct injection only, or both) based on real-time monitoring of direct fuel injector performance. When degradation is detected, the controller dynamically adjusts the fuel injection strategy to protect the injector while maintaining acceptable engine output.
Solution Approach 2:
The controller changes operational parameters by deactivating the port fuel injector when direct fuel injector degradation is detected. This parameter change (from dual injection mode to direct injection only mode) reduces thermal exposure to the degraded direct injector, slowing further degradation while maintaining sufficient engine torque through adjusted direct injection timing and duration.
2Reliability
If port fuel injector is deactivated, then direct fuel injector degradation is reduced, but engine torque output decreases
Solution Approach 1:
The system continuously monitors engine performance parameters and direct fuel injector operation to detect degradation. Based on this feedback, the controller determines when to switch injection modes and adjusts direct injection parameters to compensate for the loss of port injection, maintaining torque output within acceptable ranges while protecting the degraded injector.
Solution Approach 2:
The controller proactively switches to protective mode when degradation is first detected, preventing further deterioration. By taking preliminary action to deactivate the port injector at the appropriate threshold, the system prevents more severe degradation that would require more drastic measures and greater torque sacrifice.
3Use of energy by moving object
If direct fuel injector operates at higher temperatures, then fuel vaporization is improved, but injector degradation increases
Solution Approach 1:
The system applies preliminary anti-action by deactivating the port fuel injector when direct fuel injector degradation is detected. This counteracts the harmful thermal effect on the degraded direct injector by removing the additional heat exposure from port injection, thereby slowing degradation while the direct injector continues to provide necessary fuel vaporization.
Data Source
AI summary
Methods and systems for simultaneously operating port fuel injectors and direct fuel injectors of an internal combustion engine are described. In one example, operation of a port fuel injector is deactivated in response to an indication of reduced performance of a direct fuel injector so that degradation of the direct fuel injector may be reduced.