Fuel Control Module Adjusting Correction Factor for Emissions Testing
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Solution Overview
Problem
Current engine control systems face challenges in efficiently inducing a fuel system fault for emissions testing, often requiring a trial-and-error approach to adjust the fuel correction factor, which is time-consuming and may cause engine performance issues like hesitation, sags, or misfire.
Innovation Solution
A system comprising a fault command module, a fuel control module, and a fault detection module that automatically adjusts the fuel correction factor to a target value outside a predetermined range, optimizing the adjustment rate based on engine speed and torque to induce a fuel system fault while avoiding performance issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel correction factor is manually adjusted using a hand held tool, then the fuel system fault can be induced for emissions testing, but the process is time-consuming and requires trial-and-error approach
Solution Approach 1:
The engine control system automatically adjusts the fuel correction factor without requiring manual intervention. The system self-regulates by monitoring engine parameters and autonomously modifying fuel injection timing and quantity to induce the desired fuel system fault condition, eliminating the need for trial-and-error manual adjustment.
Solution Approach 2:
The system continuously monitors engine speed, torque, and other operational parameters to provide feedback on the current fuel correction factor state. Based on this feedback, the control algorithm automatically determines the appropriate adjustments needed to achieve the target fuel system fault condition, enabling precise and efficient fault induction.
2Productivity
If the fuel correction factor is adjusted quickly to induce fuel system fault, then the testing time is reduced, but the engine may exhibit performance issues such as hesitation, sags, or misfire
Solution Approach 1:
The system dynamically adjusts the fuel correction factor based on real-time engine operating conditions. The adjustment rate and magnitude are continuously modified according to engine speed, torque, and load parameters, allowing the system to quickly induce fuel system faults while maintaining engine performance stability through adaptive control.
Solution Approach 2:
The system changes multiple parameters simultaneously and in a coordinated manner, including fuel injection timing, injection quantity, and correction factor magnitude. By optimizing the combination and sequence of these parameter changes, the system achieves rapid fault induction without causing engine performance issues such as hesitation or misfire.
3Reliability
If the fuel correction factor is gradually adjusted to avoid engine performance issues, then the engine performance stability is maintained, but the fuel system fault is not triggered before the end of the emissions test
Solution Approach 1:
The system performs preliminary calculations and planning before adjusting the fuel correction factor. Based on pre-stored calibration data and current engine operating conditions, the system determines the optimal adjustment trajectory in advance, enabling it to reach the target fuel system fault condition within the required time while maintaining engine performance stability throughout the transition.
Data Source
AI summary
A system according to the principles of the present disclosure includes a fault command module, a fuel control module, and a fault detection module. The fault command module selectively generates a command to induce a fuel system fault based on a user input. The fuel control module automatically adjusts a fuel correction factor to a target value outside of a first predetermined range in response to the command to induce a fuel system fault. The fuel control module actuates a fuel injector associated with a cylinder of an engine based on the fuel correction factor. The fault detection module detects a fuel system fault when the fuel correction factor is outside of the first predetermined range.