Hybrid Vehicle Regenerative Control for Mode-Based SOC Reduction
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Solution Overview
Problem
Existing hybrid vehicle regenerative control technologies do not account for differences in travel modes, leading to unnecessary SOC reduction and inefficient energy recovery on downhill roads, as they uniformly reduce the state of charge regardless of the actual amount of regeneration expected.
Innovation Solution
The system detects downhill roads and adjusts SOC reduction control based on the selected travel mode, executing SOC reduction only when a large amount of regeneration is expected, and setting a target SOC value that considers the travel mode, gradient, length of the downhill road, and driving tendency to maximize energy recovery without exceeding the battery's usage limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If uniform SOC reduction control is performed before downhill roads, then energy recovery is maximized when regeneration amount is large, but unnecessary SOC reduction occurs when regeneration amount is small, reducing overall efficiency
Solution Approach 1:
The control system applies different SOC reduction strategies based on the specific travel mode detected. When regenerative braking mode is detected, SOC reduction control is performed; when non-regenerative mode is detected, SOC reduction control is suppressed. This localized adaptation to different operational conditions resolves the contradiction by making SOC reduction necessary only where it will be beneficial.
Solution Approach 2:
The system dynamically adjusts SOC reduction control based on real-time detection of travel mode. The control strategy changes from static uniform reduction to dynamic conditional reduction, allowing the system to adapt to varying regeneration potentials and avoid unnecessary energy management actions.
2Adaptability or versatility
If advance SOC reduction is performed uniformly, then allowance before usage upper limit is increased for downhill roads, but SOC may become too low when actual regeneration amount is small, affecting overall energy management
Solution Approach 1:
The system implements location-specific SOC management by detecting travel modes at different locations (before, during, and after downhill roads). SOC reduction is applied locally only when regenerative braking mode is detected, rather than uniformly across all downhill scenarios, maintaining both adaptability and productivity.
Solution Approach 2:
The control system uses feedback from travel mode detection to adjust SOC reduction timing and magnitude. By monitoring whether the vehicle is in regenerative braking mode or not, the system receives feedback that determines whether SOC reduction should be executed, creating a closed-loop control that optimizes both flexibility and efficiency.
3Device complexity
If SOC reduction control is executed without considering travel mode, then control logic is simplified, but energy recovery efficiency decreases due to unnecessary SOC reduction
Solution Approach 1:
The control system uses the vehicle's existing travel mode detection capability to automatically determine when SOC reduction should be applied. The system serves itself by utilizing already-available information (travel mode status) to make control decisions, avoiding the need for complex external sensing or calculation while improving energy efficiency.
Data Source
AI summary
A hybrid vehicle us equipped with a power generation first motor generator driven by an internal combustion engine, and a second motor generator driven by a battery. The hybrid vehicle includes an S mode, an ECO mode and a NORMAL mode which are basic travel modes. A mode change switch is used to switch between the modes. In the S mode and the ECO mode, a deceleration rate of regenerative braking on downhill roads is large, and an amount of regeneration is large. When a downhill road on a travel route has been predicted, in the S mode and the ECO mode, a controller executes an SOC reduction control in which an SOC is reduced in advance before a downhill road starts, and in the NORMAL mode, the controller does not execute the SOC reduction control.