Hybrid Vehicle Controller Filter Regeneration Strategy
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Solution Overview
Problem
In hybrid vehicles, frequent intermittent stop control of the internal combustion engine leads to prolonged filter regeneration times due to temperature fluctuations, resulting in increased particulate matter deposition beyond permissible limits.
Innovation Solution
A controller that executes intermittent stop prohibition control to maintain engine operation during filter regeneration, utilizing output raising, lower limit raising, and ignition timing retardation controls to quickly increase the filter temperature, combined with motoring control to burn deposited particulate matter, while managing catalyst degradation and vehicle speed for efficient regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If intermittent stop control is frequently executed to improve fuel efficiency, then power consumption is reduced, but filter temperature drops causing regeneration to take longer and PM deposition exceeds permissible range
Solution Approach 1:
The controller predicts future filter temperature based on current temperature and engine operation history before intermittent stop control is executed. This prediction allows the system to prepare appropriate countermeasures (such as adjusting regeneration timing or intensity) to prevent temperature drops that would hinder PM combustion, thereby maintaining fuel efficiency while ensuring filter temperature remains adequate for regeneration.
2Productivity
If engine output is increased to raise filter temperature for PM combustion, then regeneration speed improves, but fuel consumption increases
Solution Approach 1:
The controller dynamically adjusts engine output parameters based on the predicted filter temperature and PM deposition level. When intermittent stop control is executed, the prediction information guides the controller to optimize the balance between engine output increase (for faster regeneration) and fuel consumption, by adjusting parameters such as injection amount or ignition timing to achieve minimal necessary temperature elevation.
3Productivity
If engine output is increased to complete regeneration quickly, then PM burning is accelerated, but risk of catalyst overheating increases
Solution Approach 1:
The controller uses predicted filter temperature information as feedback to continuously monitor and adjust engine output during regeneration. This feedback mechanism allows the system to accelerate PM burning when conditions permit while automatically modulating engine output to prevent filter temperature from exceeding safe thresholds that would cause catalyst overheating, thus balancing regeneration speed with thermal safety.
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 ensures rapid and efficient filter regeneration, preventing excessive particulate matter accumulation and minimizing catalyst degradation, while optimizing fuel usage and preventing overheating of the catalytic converter.
Implementation Method 1
increasing the output of the internal combustion engine to increase an amount of generated heat... thereby increasing a temperature of a filter provided in an exhaust passage
Implementation Method 2
a battery that is charged with power generated by a motor-generator using output of an internal combustion engine
Implementation Method 3
execute a motoring control of driving an output shaft of the internal combustion engine using the motor-generator... thereby forcibly rotating the internal combustion engine. When the motoring control is executed, oxygen is supplied to the high-temperature filter
Implementation Method 4
increasing a temperature of a filter provided in an exhaust passage of the internal combustion engine to a temperature at which particulate matter can be burned... This burns PM deposited in the filter
Data Source
AI summary
A controller includes an engine controlling section and a motor-generator controlling section. The controller is configured to use the engine controlling section and the motor-generator controlling section to execute an intermittent stop control, a temperature increase control, an intermittent stop prohibition control, and a motoring control. The intermittent stop control automatically stops and restarts operation of an internal combustion engine. The temperature increase control increases the temperature of a filter in the exhaust passage to a temperature at which PM can be burned. The intermittent stop prohibition control prohibits stop of the operation of the internal combustion engine by the intermittent stop control until the temperature increase control is completed. The motoring control drives the output shaft of the internal combustion engine by the motor-generator, thereby forcibly rotating the internal combustion engine.