Engine Controller Combustion Suspension for Filter Temperature Control
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Solution Overview
Problem
Existing internal combustion engine control systems face challenges in managing the temperature of particulate filters during suspended combustion processes, leading to potential overheating and reduced efficiency.
Innovation Solution
A controller that executes distinct suspension processes for specific cylinders and all cylinders, adjusting thresholds based on particulate matter deposition and filter temperature, and calculates thresholds to prevent excessive heating, while also prohibiting processes until oxygen levels decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If combustion is suspended in all cylinders to burn PM in the filter, then PM burning efficiency is improved, but filter temperature increases excessively
Solution Approach 1:
The patent divides the combustion suspension process into two distinct modes: a first suspending process that suspends combustion in only a specific one of the cylinders, and a second suspending process that suspends combustion in all cylinders. This segmentation allows the system to achieve PM burning while controlling filter temperature by selecting appropriate modes based on accumulated intake air amount thresholds.
Solution Approach 2:
The patent dynamically adjusts the combustion suspension strategy based on real-time conditions. The controller determines which suspending process to execute and when to resume combustion based on the accumulated intake air amount relative to thresholds, creating a dynamic control system that adapts to varying engine operating conditions to optimize both PM burning and temperature control.
2Temperature
If combustion is suspended in a specific cylinder only, then filter temperature control is improved, but PM burning efficiency decreases
Solution Approach 1:
The patent segments the combustion suspension approach into two distinct processes: suspending combustion in a specific cylinder (first suspending process) versus suspending in all cylinders (second suspending process). This segmentation enables the system to balance temperature control and PM burning efficiency by selecting the appropriate process based on accumulated intake air amount thresholds.
Solution Approach 2:
The patent changes the operational parameters of the combustion suspension process based on the accumulated intake air amount. By comparing the accumulated intake air amount against different thresholds, the system adjusts which suspending process to execute, thereby changing the parameters of PM burning and temperature control to optimize overall performance.
3Productivity
If the suspending process is extended to burn more PM, then PM removal efficiency is improved, but the risk of filter overheating increases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the accumulated intake air amount during the suspending process and compares it against predetermined thresholds. This feedback allows the system to determine when to resume combustion, ensuring that PM burning is extended as much as possible while preventing filter overheating by stopping the suspending process when the threshold is reached.
Solution Approach 2:
The patent establishes predetermined thresholds for the accumulated intake air amount before the suspending process begins. These preliminary设定的 thresholds guide the duration and intensity of the suspending process, allowing the system to prepare for and execute the optimal balance between PM removal and temperature control based on pre-calculated safety margins.
4Speed
If combustion is resumed immediately after suspending, then engine responsiveness is improved, but PM burning is incomplete
Solution Approach 1:
The patent uses feedback control where the controller monitors the accumulated intake air amount and compares it against thresholds to determine the optimal timing for resuming combustion. This feedback mechanism ensures that combustion is resumed at the right moment to complete PM burning while maintaining engine responsiveness, rather than resuming immediately or at fixed intervals.
Solution Approach 2:
The patent dynamically determines the resumption timing based on real-time accumulation of intake air amount rather than using a fixed or predetermined schedule. This dynamic approach allows the system to optimize the balance between PM burning completeness and engine responsiveness by adapting to actual operating conditions during the suspending process.
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 approach effectively extends the suspension process duration without overheating the filter, ensuring efficient particulate matter burning and maintaining engine performance.
Implementation Method 1
a filter arranged in the exhaust passage to trap particulate matter in exhaust gas
Implementation Method 2
the above-described configuration supplies, to the filter, burned gas discharged from a cylinder in which combustion is not suspended. When the burned gas is supplied to the filter, the burned gas takes away the heat of the filter.
Data Source
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AI summary
A controller executes a first suspending process or a second suspending process when a vehicle satisfies a predetermined first condition or a predetermined second condition. The controller executes an integration process that, during execution of the first suspending process or the second suspending process, obtains an integrated value of an intake air amount of the internal combustion engine from when the first suspending process or the second suspending process that is being executed was started. When the integrated value is greater than or equal to a threshold, the controller stops the first suspending process or the second suspending process that is being executed. When the amount of particular matter deposited in a filter is the same, a first threshold, which is the threshold for the first suspending process, is greater than a second threshold, which is the threshold for the second suspending process.