Hybrid Vehicle Filter Regeneration Through CD-CS Mode Switching
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Solution Overview
Problem
In hybrid vehicles, the charge depleting (CD) mode has fewer engine operation opportunities, leading to incomplete filter regeneration during CD mode, as the engine may stop before regeneration is complete.
Innovation Solution
The vehicle is controlled to switch from CD mode to charge sustaining (CS) mode during filter regeneration, increasing engine operation opportunities and ensuring complete regeneration by maintaining the CS mode until regeneration is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the vehicle is controlled in charge depleting mode to extend electric power usage, then the battery discharge capacity is improved, but the filter regeneration completeness deteriorates due to insufficient engine operation opportunities
Solution Approach 1:
The control mode is dynamically adjusted based on regeneration status. When filter regeneration is detected as needed, the system transitions from static CD mode to CS mode temporarily, creating dynamic adaptability that resolves the contradiction between energy usage and regeneration completeness
Solution Approach 2:
The system changes the control mode parameter from CD to CS when regeneration is required. This parameter change increases engine operation frequency, providing sufficient heat for complete filter regeneration while maintaining overall energy efficiency
2Use of energy by moving object
If the engine operation opportunities are reduced in charge depleting mode, then the battery discharge capacity is improved, but the engine operating time is insufficient for complete filter regeneration
Solution Approach 1:
The system dynamically adjusts engine operation duration by switching control modes. When regeneration is needed, transitioning to CS mode extends engine operating time temporarily, ensuring complete regeneration while maintaining low overall engine usage for battery preservation
3Reliability
If the control mode is changed from charge depleting to charge sustaining during filter regeneration, then the filter regeneration completeness is improved, but the control complexity increases
Solution Approach 1:
The system uses a straightforward parameter change (control mode switching) to resolve the contradiction. The ECU monitors regeneration status and automatically switches between CD and CS modes based on simple detection criteria, achieving high regeneration completeness with minimal control complexity
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 reliably completes filter regeneration by extending engine operating time and increasing the filter temperature to a regeneratable level, even when the CD mode is selected.
Implementation Method 1
a filter, such as a diesel particulate filter (DPF) and a gasoline particulate filter (GPF), may be installed in an exhaust passage of each of the engines for the purpose of reducing the PM
Implementation Method 2
regeneration control for burning the PM accumulated in the filters is executed by utilizing exhaust heat
Implementation Method 3
regeneration control for burning the PM accumulated in the filters is executed by utilizing exhaust heat
Data Source
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AI summary
A hybrid vehicle includes an engine, a rotary electric machine, a filter and an ECU. The engine includes an exhaust passage. The rotary electric machine is a driving source of the vehicle. The filter traps particulate matter flowing through the exhaust passage. The ECU is configured to control the hybrid vehicle in any one of a plurality of control modes. The plurality of control modes include a first control mode and a second control mode. The number of opportunities for the engine to operate when the control mode is the second control mode is larger than the number of opportunities for the engine to operate when the control mode is the first control mode. The ECU is configured to, when the filter is regenerated, control the hybrid vehicle in the second control mode.