Dual Fuel Rail Control for Engine Idle Stability
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Solution Overview
Problem
Existing fuel control systems for internal combustion engines struggle to maintain optimal engine temperatures and fuel pressures, especially when the fuel system operating at idle is active for extended periods, leading to inefficiencies and potential strain on engine components.
Innovation Solution
A fuel control system comprising two fuel delivery systems with separate fuel rails and injectors, where a controller selectively enables or disables the systems based on detected temperature and pressure levels, ensuring that fuel temperatures and pressures remain within desired parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel system operating at idle is active for an extended period, then the engine can maintain stable idle operation, but engine temperatures and fuel pressures will exceed desired parameters
Solution Approach 1:
The controller continuously monitors engine temperature and fuel pressure parameters, and based on these feedback signals, selectively activates or deactivates the second fuel delivery system to maintain parameters within desired ranges while ensuring stable idle operation
Solution Approach 2:
The system dynamically switches between different fuel delivery configurations based on operating conditions. The controller can selectively enable or disable the second fuel delivery system (including its dedicated fuel rail and injectors) to adapt to varying temperature and pressure requirements
2Reliability
If the fuel system operating at idle is active for an extended period, then the engine can maintain stable idle operation, but fuel pressures will exceed desired parameters
Solution Approach 1:
The controller continuously monitors engine temperature and fuel pressure parameters, and based on these feedback signals, selectively activates or deactivates the second fuel delivery system to maintain parameters within desired ranges while ensuring stable idle operation
Solution Approach 2:
The fuel delivery system is segmented into two independent subsystems: a first fuel delivery system with its own fuel rail and injectors, and a second fuel delivery system with a separate fuel rail and injectors. This segmentation allows independent control of each subsystem to optimize performance and prevent excessive pressure buildup
3Device complexity
If a single fuel delivery system is used, then the system complexity is reduced, but the ability to maintain optimal temperatures and pressures under varying operating conditions deteriorates
Solution Approach 1:
The dual fuel delivery system provides multi-functionality: the first fuel delivery system can operate independently for basic fueling, the second fuel delivery system can operate independently for enhanced control, and they can work in combination to maintain optimal temperatures and pressures across varying operating conditions including idle and transient states
Data Source
AI summary
A fuel system comprises a first fuel rail. A first fuel delivery system, including a first plurality of fuel injectors, is connected to the first fuel rail. The first plurality of fuel injectors injects an amount of fuel into a first portion of an engine. A second fuel rail has a second fuel delivery system, including a second plurality of fuel injectors. The second plurality of fuel injectors inject an amount of fuel into a second portion of the engine, distinct from the first portion. A controller, operatively connected to the first fuel delivery system and the second fuel delivery system selectively enables and disables operation of the first fuel delivery system and the second fuel delivery system based on one of a detected temperature and a detected pressure of fuel passing to corresponding ones of the first plurality of fuel injectors and the second plurality of fuel injectors.