Cylinder Deactivation for Gasoline Particulate Filter Regeneration
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Solution Overview
Problem
Gasoline direct injection engines generate a large amount of particulate matter due to incomplete combustion, leading to insufficient oxygen for regeneration in gasoline particulate filters, making filter regeneration difficult and time-consuming.
Innovation Solution
An exhaust gas purification device with a gasoline particulate filter and an electronic control unit that selectively deactivates engine cylinders to supply air for regeneration, using pressure difference sensors to determine the necessary air supply based on engine and filter conditions, eliminating the need for a separate air supply device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a gasoline particulate filter is used to trap particulate matter, then PM emission is reduced, but sufficient oxygen is not available for regeneration
Solution Approach 1:
The engine operates with selective cylinder deactivation, dividing the engine's cylinders into active and deactivated groups. During regeneration, deactivated cylinders provide a source of oxygen-rich exhaust gas to the particulate filter, while active cylinders maintain normal engine operation. This segmentation allows simultaneous PM trapping and oxygen supply for regeneration without requiring a separate air supply system.
2Productivity
If cylinders are selectively deactivated to supply air for regeneration, then regeneration efficiency is improved, but engine complexity increases
Solution Approach 1:
The cylinder deactivation system serves multiple functions: it provides oxygen for filter regeneration, maintains engine operation during the process, and can be controlled based on various conditions (filter loading, driving mode, temperature). The existing ECU and cylinder control mechanisms are utilized for regeneration, avoiding the need for separate dedicated hardware and minimizing added complexity.
3Device complexity
If regeneration is performed without separate air supply device, then device complexity and cost are reduced, but regeneration time increases
Solution Approach 1:
The engine's own deactivated cylinders generate the oxygen-rich exhaust gas needed for regeneration, making the system self-sufficient. The system uses the engine's inherent operation to provide both power and regeneration oxygen, eliminating the need for external air supply devices while maintaining reasonable regeneration timing through intelligent cylinder selection and control.
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 allows for efficient regeneration of the particulate filter, reducing regeneration time and improving fuel consumption efficiency without increasing costs, as it ensures sufficient oxygen is provided for burning particulate matter.
Implementation Method 1
a gasoline particulate filter that is disposed on an exhaust pipe that is connected to the engine so as to trap particulate matter of exhaust gas of the engine
Implementation Method 2
pressure difference sensors that are respectively disposed at a downstream side and an upstream side of the gasoline particulate filter to measure a pressure difference of the gasoline particulate filter
Implementation Method 3
a three-way catalyst that is disposed at an upstream side of the gasoline particulate filter
Data Source
AI summary
An exhaust gas purification device may deactivate at least one of cylinders to supply a gasoline particulate filter with sufficient air according to a driving condition of a gasoline engine, and a control method thereof and a control method thereof may include comparing a pressure difference of the gasoline particulate filter with a predetermined value, determining a cylinder that may be to be deactivated when the pressure difference may be larger than the predetermined value, regenerating the gasoline particulate filter by supplying it with air through the deactivated cylinder, determining whether the engine may be in an over-run condition during the regeneration process, and returning to a general driving condition in a case that the engine may be in the over-run condition.