Engine Fueling Control With Constant Fuel Rate at Load
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Solution Overview
Problem
Existing engine control systems optimize brake specific fuel consumption (BSFC) at the expense of increased fuel consumption, leading to longer travel times with minimal performance differences, indicating a need for a system that reduces fuel consumption without compromising vehicle performance.
Innovation Solution
A system and method that control engine fueling by maintaining a constant fuel delivery rate per unit time upon attaining a predetermined operational state, such as engine speed or fuel flow rate, and allowing fuel delivery to range between minimum and maximum rates based on operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine is operated to optimize brake specific fuel consumption (BSFC) at full load with a lower engine speed, then fuel consumption is reduced, but travel time increases and vehicle performance deteriorates
Solution Approach 1:
The system dynamically switches between two operational modes based on real-time conditions: a BSFC optimization mode for fuel efficiency and a constant fuel delivery mode for performance. This dynamic adaptation allows the system to resolve the contradiction by selecting the appropriate mode depending on whether fuel savings or travel time is the priority, rather than being locked into a single static operating strategy
Solution Approach 2:
The system changes the fuel delivery parameter from a variable rate optimized for BSFC to a constant rate that maintains performance. By altering this key parameter and switching between different fuel delivery strategies, the system can achieve either fuel consumption reduction or maintained performance as needed, resolving the trade-off between these two objectives
2Loss of energy
If the engine is operated to optimize brake specific fuel consumption (BSFC), then fuel efficiency is improved, but overall fuel consumption increases due to extended operation time
Solution Approach 1:
The system dynamically switches between two operational modes based on real-time conditions: a BSFC optimization mode for fuel efficiency and a constant fuel delivery mode for performance. This dynamic adaptation allows the system to resolve the contradiction by selecting the appropriate mode depending on whether fuel savings or travel time is the priority, rather than being locked into a single static operating strategy
Solution Approach 2:
The system changes the fuel delivery parameter from a variable rate optimized for BSFC to a constant rate that maintains performance. By altering this key parameter and switching between different fuel delivery strategies, the system can achieve either fuel consumption reduction or maintained performance as needed, resolving the trade-off between these two objectives
3Loss of energy
If the engine operates at lower speeds to optimize BSFC, then energy efficiency is improved, but power delivery and vehicle performance deteriorate
Solution Approach 1:
The system dynamically switches between two operational modes based on real-time conditions: a BSFC optimization mode for fuel efficiency and a constant fuel delivery mode for performance. This dynamic adaptation allows the system to resolve the contradiction by selecting the appropriate mode depending on whether fuel savings or travel time is the priority, rather than being locked into a single static operating strategy
Data Source
AI summary
A system is provided for controlling engine fueling and includes an internal combustion engine, a fuel source, means for delivering fuel from the fuel source to the engine, and a controller configured to control the fuel delivering means according to a first operational mode so that, upon attaining a predetermined operational state of the engine, an amount of fuel delivered to the engine per unit time is kept constant. The system will typically but not necessarily be provided in a vehicle such as a truck or a passenger automobile. A method for controlling engine fueling is also provided.