Vehicle Filter Regeneration Control to Limit Overheating
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Solution Overview
Problem
Existing vehicle control systems face challenges in efficiently regenerating particulate filters in exhaust passages while preventing overheating, especially when both air and oxygen supplying processes are simultaneously executed.
Innovation Solution
A controller for a vehicle that includes control circuitry to execute an air supplying process, an oxygen supplying process, and a reducing process. The reducing process adjusts the air supply amount per unit time to be lower when both air and oxygen supplying processes are executed, thereby reducing the risk of overheating while ensuring sufficient oxygen for filter regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If both air supplying process and oxygen supplying process are simultaneously executed to quickly regenerate the filter, then regeneration speed is improved, but the filter temperature increases excessively causing overheating
Solution Approach 1:
The patent dynamically adjusts the air supply amount based on whether oxygen supplying process is being executed. When oxygen supplying process is active, the air supply amount is reduced to a lower level; when it is not active, normal air supply is maintained. This dynamic adjustment resolves the contradiction by adapting the air supply strategy to current operational conditions, enabling quick regeneration when needed while preventing overheating.
Solution Approach 2:
The patent changes the parameter of air supply amount (flow rate) based on the execution state of oxygen supplying process. By switching between different air supply levels (reduced level during oxygen supplying, normal level otherwise), the system optimizes regeneration speed while controlling filter temperature, thus resolving the contradiction between productivity and temperature control.
2Quantity of substance
If air supply amount is increased to supply sufficient oxygen for filter regeneration, then regeneration effectiveness is improved, but the risk of filter overheating increases
Solution Approach 1:
The system dynamically adjusts air supply amount based on the execution state of oxygen supplying process. When oxygen supplying is active, air supply is reduced to prevent overheating; when inactive, normal air supply provides sufficient oxygen for regeneration. This dynamic parameter adjustment resolves the contradiction between oxygen quantity and temperature control.
Solution Approach 2:
The patent ensures continuous effective regeneration by maintaining appropriate air supply levels according to operational phase. The air supply is continuously adjusted to provide sufficient oxygen when needed while preventing overheating, ensuring uninterrupted useful action for filter regeneration without temperature excursions.
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
The controller allows for quick regeneration of particulate filters while minimizing the risk of overheating, by optimizing the air supply amount during simultaneous air and oxygen supplying processes.
Implementation Method 1
an air pump and an air supply passage that is connected to the exhaust passage. The internal combustion engine disclosed in the literature drives the air pump to deliver air to the exhaust passage through the air supply passage.
Implementation Method 2
Since oxidization is expedited in the catalyst, combustion of the particulate matter deposited in the filter is expedited.
Implementation Method 3
The air supply device supplies the air to a filter in the exhaust passage to expedite combustion of deposited particulate matter.
Implementation Method 4
the oxygen having been passed through a combustion chamber of the internal combustion engine
Data Source
AI summary
A controller for a vehicle is provided. An air supply passage is connected to a portion upstream of a filter in an exhaust passage. An air supplying process supplies air to the filter through an air supply passage by driving an air pump. An oxygen supplying process supplies oxygen to the filter through the exhaust passage, the oxygen having been passed through a combustion chamber of an internal combustion engine. A reducing process sets an air supply amount per unit time in the air supplying process obtained when the oxygen supplying process and the air supplying process are simultaneously executed to be lower than the air supply amount per unit time in the air supplying process obtained when the oxygen supplying process and the air supplying process are not simultaneously executed.