Fuel Correction System for Diesel Torque Consistency
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Solution Overview
Problem
Variations in the energy content of diesel fuel cause inconsistencies in the torque produced by diesel engines, making it challenging to maintain a desired torque output.
Innovation Solution
A fuel control system that includes a fuel delivery module, a torque ratio determination module, and a correction factor module, which supplies different amounts of diesel fuel during combustion cycles and adjusts fuel delivery based on a calculated torque ratio and correction factor to compensate for variations in fuel energy content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed amount of fuel is supplied to the engine, then the fuel delivery system is simple and reliable, but the torque output becomes inconsistent due to variations in fuel energy content
Solution Approach 1:
The system measures actual torque output and compares it to desired torque, then uses this feedback to calculate a correction factor that adjusts fuel delivery. This closed-loop feedback mechanism ensures consistent torque output despite variations in fuel energy content, while avoiding the need for complex predictive models or multiple sensors.
Solution Approach 2:
The system dynamically changes the fuel delivery parameter (fuel amount) based on the correction factor derived from torque measurements. By adjusting this key parameter in real-time, the system compensates for fuel quality variations and maintains desired torque output without requiring complex hardware modifications.
2Reliability
If fuel delivery is adjusted frequently to maintain torque, then torque consistency improves, but fuel consumption increases due to over-correction
Solution Approach 1:
The system applies a correction factor that is proportional to the torque deviation rather than always applying maximum correction. This partial action approach adjusts fuel delivery just enough to compensate for measured torque variations, avoiding over-correction and the associated energy waste while maintaining adequate torque consistency.
3Manufacturing precision
If the fuel control system uses complex algorithms to compensate for fuel variations, then torque precision improves, but the difficulty of detecting and measuring torque accurately increases
Solution Approach 1:
The system uses an intermediary correction factor that translates torque measurements into fuel delivery adjustments without requiring direct complex modeling of fuel properties. This intermediary parameter simplifies the measurement and control process while achieving precise torque control, avoiding the need for sophisticated sensors or complex real-time calculations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system ensures consistent torque production by adjusting fuel amounts during later combustion cycles, thereby maintaining desired torque output despite variations in diesel fuel energy content, ensuring smooth engine operation and minimizing fuel consumption.
Implementation Method 1
The air mixes with fuel provided by one or more fuel injectors to form an air/fuel mixture
Implementation Method 2
Combustion of the air/fuel mixture produces drive torque. More specifically, drive torque is generated through heat release and expansion that occurs during combustion of the air/fuel mixture within the cylinders
Implementation Method 3
In diesel engine systems, combustion is initiated by injection of the fuel into the cylinders. More specifically, heat provided by compression ignites injected fuel
Data Source
AI summary
A fuel control system for a vehicle comprises a fuel delivery module, a torque ratio determination module, and a correction factor module. The fuel delivery module supplies first and second amounts of diesel fuel to a cylinder of an engine during first and second combustion cycles for the cylinder, respectively. The second combustion cycle occurs after the first combustion cycle. The torque ratio determination module determines a torque ratio based on torque output by the engine during the first combustion cycle and a torque requested for the first combustion cycle. The correction factor module determines a fuel correction factor based on the torque ratio and adjusts the second amount based on the fuel correction factor.