Fuel Dynamics Control with Lost Fuel Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fuel control systems for internal combustion engines do not adequately determine lost fuel or non-linear fuel dynamics, leading to inadequate compensation and increased calibration efforts, which affects emission standards and system costs.
Innovation Solution
A fuel control system that includes a fuel dynamics module to determine an inverse fuel dynamics model, generating an adjusted fuel command based on the model and a lost fuel factor, which is used to calculate a final fuel command for precise fuel delivery, incorporating a non-linear term in the fuel dynamics model for accurate and robust calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gain scheduling or extra fuel addition is used to compensate for lost fuel, then fuel delivery is adjusted, but the accuracy of lost fuel determination is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where the actual fuel burned is measured and compared with the commanded fuel injection amount. The difference (lost fuel) is fed back to the control system, which then adjusts future fuel commands accordingly. This closed-loop feedback approach enables accurate lost fuel determination without requiring overly complex open-loop compensation schedules.
Solution Approach 2:
The system uses the engine's own combustion process to generate the measurement data needed for compensation. By measuring the actual fuel burned through the exhaust oxygen sensor and comparing it with the commanded fuel, the system self-determines the lost fuel amount without requiring external measurement devices or complex calibration procedures.
2Ease of manufacture
If traditional fuel control methods are used, then system implementation is simpler, but calibration effort increases
Solution Approach 1:
The real-time feedback from the exhaust oxygen sensor eliminates the need for extensive manual calibration. The system automatically adapts to different operating conditions by continuously measuring actual fuel burned and adjusting commands accordingly, significantly reducing calibration time while maintaining simple implementation.
Solution Approach 2:
The system performs self-calibration by using its own operational data. The control module automatically determines lost fuel factors based on measured versus commanded fuel values during normal operation, eliminating the need for separate calibration procedures and reducing calibration effort to minimal initial setup.
3Reliability
If more fuel is injected to compensate for lost fuel, then combustion requirements are met, but fuel control accuracy decreases
Solution Approach 1:
The feedback mechanism precisely measures the actual fuel burned and calculates the exact lost fuel amount. This enables the control system to inject only the necessary additional fuel for compensation without over-injection, maintaining both combustion reliability and fuel control accuracy through precise closed-loop control.
Solution Approach 2:
The system dynamically adjusts the fuel command parameter based on the measured lost fuel factor. By changing the fuel injection parameter in real-time according to actual combustion efficiency, the system achieves both reliable combustion (by ensuring sufficient fuel) and high accuracy (by avoiding excessive fuel injection).
Data Source
AI summary
A fuel control system delivers fuel to an engine cylinder and compensates for lost fuel. The fuel control system comprises a fuel dynamics module that determines a fuel dynamics model that is indicative of fuel behavior. The fuel dynamic module determines an inverse of the fuel dynamics model, receives a fuel command, and generates an adjusted fuel command based on the fuel command and the inverse of the fuel dynamics model. A lost fuel compensation module receives the adjusted fuel command and generates a final fuel command based on the adjusted fuel command and a lost fuel factor. A control module controls fuel delivery according to the final fuel command.