Hybrid Vehicle GPF Refresh Control to Avoid Unintended Engine Noise
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Solution Overview
Problem
Series hybrid vehicles face discomfort issues for drivers due to noise generated by motoring operations intended for particulate matter combustion in the Gasoline Particulate Filter (GPF), which can occur at unintended times, such as during charging or in quiet modes.
Innovation Solution
A control method for hybrid vehicles that prohibits motoring operations when certain conditions are met, such as charging mode, low battery state of charge, EV priority mode, or heating requests, to prevent unnecessary noise and maintain driver comfort, while still refreshing the GPF by performing motoring operations when particulate matter accumulates to a predetermined level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motoring operation is performed to combust PM in GPF, then the GPF is refreshed, but driving noise is generated and driver comfort is impaired
Solution Approach 1:
The control device changes the operational parameters of the engine by switching between motoring mode (for GPF refresh) and power generation mode (for charging), timing these parameter changes to occur only when specific conditions are met, thereby reducing noise impact while maintaining GPF functionality
Solution Approach 2:
The system dynamically adjusts the engine's operational state based on real-time conditions, transitioning between motoring and power generation modes as needed, allowing the GPF refresh operation to occur only when it will not negatively impact driver comfort
2Reliability
If motoring operation is performed to refresh GPF, then PM is combusted, but power generation is interrupted
Solution Approach 1:
The control device dynamically manages the engine's operational mode, switching between motoring and power generation based on real-time conditions, ensuring that motoring operations occur only when power generation is not required, thus maintaining energy efficiency while achieving GPF refresh
Solution Approach 2:
The control device checks whether power generation is required before initiating a motoring operation, performing a preliminary assessment of system needs to prevent interruption of power generation and ensure optimal energy management
3Reliability
If motoring operation is performed to refresh GPF, then the engine is rotated by power generator, but the operation may occur at unintended timing
Solution Approach 1:
The control device continuously monitors system conditions and driver intentions, using feedback from various sensors and system states to determine the appropriate timing for motoring operations, ensuring that GPF refresh occurs only when it will not conflict with driver expectations or vehicle operational needs
Solution Approach 2:
The system dynamically evaluates multiple conditions including driver intention, power generation needs, and GPF status to determine the optimal timing for motoring operations, making the decision-making process adaptive rather than fixed
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 method effectively refreshes the GPF without impairing driver comfort by ensuring motoring operations are only performed when intended, thus maintaining quiet operation and preventing potential failures in power generation or heating requests.
Implementation Method 1
a power generator that charges a battery using power of an engine
Implementation Method 2
an electric motor that drives a driving wheel by electric power of the battery
Implementation Method 3
a particulate filter that collects particulate matters contained in exhaust gas from the engine
Implementation Method 4
combust the PM accumulated in the GPF at an appropriate timing to refresh the GPF
Data Source
AI summary
A control method for a hybrid vehicle is provided. The hybrid vehicle includes: a power generator that charges a battery using power of an engine; an electric motor that drives a driving wheel by electric power of the battery; a particulate filter that collects particulate matters contained in exhaust gas from the engine. In the control method, electric power is supplied from the battery to the power generator to perform a motoring operation of rotating the engine by the power generator to supply air to the particulate filter when particulate matters of a first predetermined amount or more are accumulated in the particulate filter. And motoring operation is prohibited even if the particulate filter is accumulated with particulate matters of the first predetermined amount or more when a predetermined first condition that a driver does not intend a motoring operation is satisfied.