Vehicle Filter Regeneration Control Using Cabin Noise Masking
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Solution Overview
Problem
Existing filter regeneration control systems in vehicles generate loud noise during high-speed or noisy conditions, causing discomfort to drivers and occupants.
Innovation Solution
A filter regeneration control device that determines the sound pressure level in the vehicle cabin and executes filter regeneration control by increasing engine temperature and supplying oxygen only when the sound pressure level is high, masking the noise with existing cabin sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filter regeneration control is executed by increasing engine rotation speed, then the filter can be regenerated effectively, but noise in the vehicle cabin increases causing discomfort to driver and occupants
Solution Approach 1:
The system dynamically adjusts the engine rotation speed during filter regeneration based on the detected cabin noise level. When high cabin noise is detected, the control unit lowers the engine rotation speed during regeneration, adapting the regeneration process to current acoustic conditions while still achieving filter regeneration.
Solution Approach 2:
The system uses a noise level detector to continuously monitor cabin noise and provides feedback to the control unit. This feedback mechanism enables the control unit to adjust regeneration parameters in real-time based on actual acoustic conditions, balancing regeneration effectiveness with noise comfort.
2Productivity
If filter regeneration is executed in noisy areas, then regeneration can be performed without masking noise concerns, but driver and occupants experience discomfort from combined noise
Solution Approach 1:
The noise level detector provides real-time feedback about cabin acoustic conditions, enabling the control unit to make informed decisions about when to execute regeneration. The system monitors noise levels and only initiates regeneration when conditions are favorable, balancing productivity with comfort.
Solution Approach 2:
The system performs preliminary noise level assessment before initiating filter regeneration. By detecting cabin noise level in advance and evaluating whether it exceeds predetermined thresholds, the system determines the appropriate timing for regeneration execution, ensuring comfort is maintained while enabling regeneration when appropriate.
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
Suppresses the perception of noise discomfort by ensuring filter regeneration is performed during conditions where cabin noise is already elevated, thus masking the regeneration noise with existing cabin sounds.
Implementation Method 1
a warm-up operation of increasing an exhaust temperature of the engine to increase a temperature of the filter
Implementation Method 2
a regeneration operation of supplying oxygen to the filter through the engine
Data Source
AI summary
A filter regeneration control device for a vehicle is configured to restore a collecting capability of a filter that collects particulate matter contained in an exhaust gas of an engine. The filter regeneration control device is configured to execute filter regeneration control including a warm-up operation of increasing an exhaust gas temperature of the engine to increase a temperature of the filter and a regeneration operation of supplying the filter with oxygen through the engine in a case where an amount of the particulate matter deposited in the filter is equal to or greater than a predetermined amount and a sound pressure level in a vehicle cabin is equal to or higher than a predetermined level.