Series Hybrid Deceleration Control Under Fuel Cut-Off Prohibition
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Solution Overview
Problem
In series hybrid vehicles, unintended fluctuations in deceleration occur when regenerative deceleration is attempted while a fuel cut-off is prohibited to prevent filter overheating, leading to driver discomfort.
Innovation Solution
A vehicle control method that suppresses the regeneration amount by the drive motor when an engine fuel cut-off prohibition condition is met, using a combination of regeneration limit torques and controlled motoring to stabilize deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regenerative deceleration is performed when the battery is fully charged and there is insufficient room for regeneration, then deceleration cannot be ensured, but if motoring is performed to consume electrical power and create room for regeneration, then deceleration can be ensured; however, if a fuel cut-off is being prohibited to suppress the filter from overheating, then motoring cannot be performed and deceleration cannot be ensured, resulting in unintended fluctuations in the rate of deceleration and driver discomfort
Solution Approach 1:
The control device suppresses regeneration in advance when it determines that both the fuel cut-off prohibition condition is met and the battery is in a fully charged state. By proactively preventing regeneration under these specific conditions, the system avoids the sequence of events that would lead to deceleration fluctuations and driver discomfort, even though this means temporarily sacrificing deceleration performance.
2Temperature
If a fuel cut-off is prohibited to suppress the filter from overheating, then the filter temperature is controlled, but deceleration cannot be ensured by means of motoring, leading to insufficient room for regenerative power and driver discomfort
Solution Approach 1:
The control device continuously monitors the fuel cut-off prohibition condition and battery charge state, and uses this feedback information to dynamically adjust regeneration suppression. When the fuel cut-off prohibition condition is met and the battery is fully charged, the system activates regeneration suppression; when either condition changes, the suppression is lifted. This closed-loop control ensures filter temperature management while optimizing regenerative power utilization.
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
Minimizes unintended fluctuations in deceleration by gradually adjusting regeneration limits and employing motoring to ensure smooth deceleration even when the fuel cut-off is prohibited, enhancing driver comfort.
Implementation Method 1
a drive motor 3, instead of directly transmitting power from the engine 1 to the drive wheels 5, has a function of not only driving the drive wheels 5 but also performing regeneration
Implementation Method 2
the engine 1 being used to drive the generator 2 to generate electrical power
Implementation Method 3
provided with a filter that collects particulate matter in the exhaust gas from the engine
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A control method for a vehicle provided with an engine, a generator, and a drive motor, the engine being used to drive the generator to generate electrical power, which in turn is used to drive the drive motor, and a GPF system that collects particulate matter in the exhaust gas from the engine, wherein the regeneration amount by the drive motor when an FCOI signal turns on is suppressed.