Dual Fuel Injector Error Allocation for Engine Cylinder Control
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Solution Overview
Problem
In internal combustion engines equipped with both port and direct fuel injectors, it is challenging to determine which fuel injection system is contributing more or less fuel, leading to fueling errors and making it difficult to diagnose and address degradation in the fueling systems.
Innovation Solution
The method involves injecting fuel through both a first and second fuel injector, and indicating degradation by analyzing the rate of change of air-fuel ratio error and the fraction of fuel injected via each injector, allowing for the allocation of air-fuel ratio errors to differentiate between the two systems and identify the source of fueling errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both port and direct fuel injectors are used to supply fuel to engine cylinders, then combustion stability and fuel economy are improved, but it becomes difficult to determine which fuel injection system is providing more or less fuel than desired
Solution Approach 1:
The patent segments the total fuel injection system into two separate subsystems (port fuel injection and direct fuel injection) and further segments the error detection by allocating air-fuel ratio errors to specific subsystems based on their respective fuel fractions. This allows independent monitoring and diagnosis of each injection system's performance.
Solution Approach 2:
The patent implements feedback by continuously monitoring air-fuel ratio using oxygen sensors and using this information to adaptively adjust fuel injection quantities. The system feeds back error information to identify which injection system is contributing to fueling errors, enabling corrective actions.
2Ease of operation
If directly injected fuel is used during cold engine starts, then fuel delivery is improved, but soot forms on engine pistons increasing particulate matter output
Solution Approach 1:
The patent dynamically switches between port fuel injection and direct fuel injection modes based on engine operating conditions. During cold starts, the system can use port injection to reduce particulate matter, while transitioning to direct injection during warm operation for improved fuel economy and performance.
3Reliability
If directly injected fuel is used at higher engine speeds and loads, then knock resistance is improved, but particulate matter formation increases during cold operation
Solution Approach 1:
The patent changes the fuel injection parameters (injection timing, quantity, and method) based on engine operating conditions. The system adjusts between port and direct injection modes, modifying injection quantities and timing to optimize performance while minimizing harmful emissions under different operating conditions.
Data Source
AI summary
Systems and methods for improving fuel injection of an engine that includes a cylinder receiving fuel from two different fuel injectors is disclosed. In one example, fueling errors for each of the two fuel injectors are determined based on fractions of fuel supplied by the two fuel injectors during different engine operating conditions.