Hybrid Vehicle GPF Control via PM Combustion Feedback
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Solution Overview
Problem
Hybrid vehicles face challenges in preventing excessive particulate matter deposition in filters due to limited opportunities for fuel cutting, leading to higher PM retention and increased risk of filter melting damage, while existing solutions often result in unnecessary idle run control and energy wastage.
Innovation Solution
A hybrid vehicle system that includes a temperature acquisition part and control part to perform motor drive control when the filter temperature is higher than a reference temperature and the particulate matter combustion amount is below a threshold, optimizing the timing of idle run control to prevent excessive deposition without wasting energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor drive control is performed whenever filter temperature exceeds reference temperature to prevent excessive PM deposition, then PM deposition prevention is improved, but energy consumption increases due to unnecessary idle run control
Solution Approach 1:
The control part continuously monitors the particulate matter combustion amount (integration value) and uses this feedback to determine whether motor drive control is necessary. When the combustion amount exceeds the threshold, idle run control is suppressed; when it remains below the threshold, motor drive control is executed. This feedback mechanism prevents unnecessary energy consumption while ensuring filter protection.
Solution Approach 2:
The system changes the control parameter from a simple temperature-based threshold to a dynamic parameter that considers both temperature and cumulative PM combustion amount. This parameter change allows the system to adapt its control strategy based on the actual PM combustion status, reducing unnecessary motor drive operations while maintaining filter safety.
2Quantity of substance
If fuel cutting function is used frequently to remove PM from filter, then PM deposition is reduced, but filter temperature rises excessively causing melting damage risk
Solution Approach 1:
Instead of continuously performing fuel cutting to remove all PM, the system performs partial action by executing motor drive control only when the cumulative PM combustion amount is below the threshold. This partial action is sufficient to prevent excessive deposition while avoiding the harmful excessive heating that would occur with continuous fuel cutting.
Solution Approach 2:
The system maintains continuous monitoring of PM combustion amount and adjusts motor drive control execution accordingly. This continuous useful action ensures that PM deposition is prevented through timely, targeted motor drive operations rather than through excessive fuel cutting that would cause temperature rise and potential filter damage.
3Use of energy by moving object
If motor drive control is suppressed when PM combustion amount is high, then energy consumption is reduced, but PM deposition prevention effectiveness decreases
Solution Approach 1:
The control part uses feedback from the PM combustion amount measurement to make intelligent decisions about motor drive control execution. When feedback indicates high combustion amounts (exceeding threshold), the system correctly suppresses motor drive control, avoiding unnecessary energy consumption. When feedback shows low combustion amounts (below threshold), the system executes motor drive control to prevent excessive PM deposition, thus maintaining reliability.
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 system effectively prevents excessive particulate matter deposition in filters by accurately calculating and managing combustion and discharge integration amounts, reducing energy wastage and ensuring the filter operates within safe temperature limits, thereby enhancing fuel efficiency and preventing filter damage.
Implementation Method 1
a filter (e.g., the gasoline particulate filter (GPF) 33 which will be described below) provided on an exhaust passage (e.g., the exhaust pipe 32 which will be described below) of an engine to capture particulate matter included in exhaust
Implementation Method 2
PM trapped by the filter is appropriately combusted and removed by the high-temperature exhaust while the vehicle travels
Implementation Method 3
PM trapped by the filter is combusted... new air including a large amount of oxygen flows into the filter having a high temperature due to acceleration, and thus PM deposited in the filter is combusted
Data Source
AI summary
A hybrid vehicle is provided. A vehicle V has a gasoline particulate filter (GPF) provided on an exhaust passage to capture particulate matter (PM) included in exhaust, a generator motor connected to a crank shaft of an engine, an exhaust temperature sensor acquiring a filter temperature correlated with a temperature of the GPF, and an electronic control unit (ECU) performing motor drive control for rotating the crank shaft with the generator motor when a filter temperature is higher than or equal to a PM combustion start temperature and a PM combustion integration amount that is an integration amount of PM combusted in the GPF is less than a PM discharge integration amount.