Engine Drivability Robustness via Variable Fuel Injection Indexing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for maintaining engine drivability robustness under low volatile fuel conditions in gasoline direct injection (GDI) engines face challenges such as increased emissions and smoke generation due to limited combustion mode switching, leading to driver complaints and environmental pollution.
Innovation Solution
A method involving variable indexing to determine injection mode indexes based on engine state, throttle valve, and oxygen sensor data, switching to rich lambda control during engine RPM drops, and adjusting fuel injection modes between suction single, split, and compression split injections to reduce emissions and ensure robust drivability without unnecessary low volatile function activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low temperature/low volatile fuel condition control mode is applied to maintain drivability, then drivability robustness is improved, but emission increases and smoke is generated
Solution Approach 1:
The patent applies parameter changes by introducing multiple indexes (injection mode index, lambda control factor, injection timing advance amount) to dynamically adjust combustion parameters. Based on engine state (starting, stop, deceleration), the system selects appropriate injection modes and lambda control levels, changing combustion parameters to reduce HC and smoke emissions while maintaining drivability robustness under low volatile fuel conditions
Solution Approach 2:
The system dynamically adjusts injection mode and lambda control based on real-time engine state detection. The engine controller continuously monitors engine RPM, throttle valve position, and other parameters to determine current operating state, then dynamically switches between different injection modes (suction single, split, compression split) and lambda control levels, making the system adaptive rather than static
2Reliability
If combustion mode switching is limited to suction compression injection, then drivability robustness is improved, but HC emission increases and environmental pollution occurs
Solution Approach 1:
The patent segments the injection process into three distinct modes: suction single injection, suction split injection, and compression split injection. Each mode is assigned a specific index value (0, 1, or 2) and is selected based on engine state and driving conditions. This segmentation allows the system to choose the most appropriate injection mode for each situation, reducing HC emissions while maintaining drivability
Solution Approach 2:
The system changes the injection mode parameter based on detected engine state. When starting condition is detected with injection mode index of 1, suction single injection is performed. When stop or deceleration conditions are detected with index of 2, compression split injection is used. This parameter change approach reduces HC emission compared to limited suction compression injection
3Reliability
If fuel amount is increased to prevent RPM drop, then drivability is improved, but emission increases and driver complaints occur
Solution Approach 1:
The system implements feedback control by continuously monitoring engine RPM and comparing actual RPM with targeted RPM. When RPM drop is detected, the engine controller adjusts lambda control factor and fuel injection amount in real-time. This feedback mechanism ensures drivability is maintained while minimizing unnecessary fuel increase, thereby reducing emissions
Solution Approach 2:
The patent changes the lambda control parameter dynamically based on detected conditions. When RPM drop is detected during fuel reduction driving, the lambda control factor is adjusted to increase fuel amount appropriately. This parameter change is done only when necessary, avoiding unnecessary emission increase while maintaining drivability
Data Source
AI summary
A method for engine drivability robustness includes: dividing, by an engine controller, an engine state into a starting condition, a stop condition, and a deceleration condition; dividing an injection mode index of a fuel injection into a suction compression injection of the starting condition, a suction split injection of the stop condition, and a suction compression split injection of the deceleration condition, respectively, depending on a low volatile fuel condition; and performing a variable indexing mode to prevent an engine off by applying a lambda control factor for a rich lambda control by an increase in fuel amount to the deceleration condition.