Hybrid EV Battery SOC Control for Motor-Only Region Planning
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Solution Overview
Problem
In hybrid electric vehicles, the controls for decreasing and increasing the battery's electricity storage ratio can interfere with each other, particularly when predicting long stops or electric-only travel regions.
Innovation Solution
The vehicle's controller prioritizes the control for increasing the battery's electricity storage ratio before entering a motor-only travel region over the control for decreasing the ratio before a long stop region, thereby avoiding interference between the two controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If control for decreasing electricity storage ratio before a long stop region is executed, then energy efficiency during warm-up operation is improved, but interference occurs with control for increasing electricity storage ratio before an electrically-powered traveling region
Solution Approach 1:
The controller performs preliminary determination of whether to execute the first control (decreasing electricity storage ratio) before entering a long stop region. By checking in advance whether an electrically-powered traveling region exists within a predetermined distance range from the long stop region, the controller avoids initiating control actions that would later interfere with each other, thus resolving the control interference problem while maintaining energy efficiency.
2Reliability
If control for increasing electricity storage ratio before an electrically-powered traveling region is executed, then reliable electrically-powered traveling is achieved, but interference occurs with control for decreasing electricity storage ratio before a long stop region
Solution Approach 1:
The controller performs preliminary determination by checking whether an electrically-powered traveling region is located within a predetermined distance range from a long stop region. When such a region is detected, the controller prohibits execution of the first control (decreasing electricity storage ratio), thereby ensuring that the electricity storage ratio is sufficiently increased before the electrically-powered traveling region while avoiding interference with the second control.
3Productivity
If both controls are executed independently, then each control optimizes its respective function, but the controls interfere with each other when their target regions are close
Solution Approach 1:
The controller merges the decision-making processes of the first control (decreasing electricity storage ratio before long stop) and the second control (increasing electricity storage ratio before electrically-powered traveling) by implementing a unified determination mechanism. When an electrically-powered traveling region is detected within the predetermined distance range from a long stop region, the controller integrates both control objectives and prohibits the first control, thereby eliminating interference while maintaining overall system optimization.
Data Source
AI summary
Execution of control for first spot region of performing traveling by controlling an engine and a motor such that the electricity storage ratio of an electricity storage apparatus becomes smaller before a first spot region presumed or set as a spot or a region preferred to be reached in a state in which the electricity storage ratio of the electricity storage apparatus is small is prohibited when execution of control for second spot region of traveling by only a motive power from the motor by stopping the engine is presumed or planned within a predetermined distance range in a second spot region presumed or set as a spot or a region in which electrically-powered traveling of traveling by only the motive power from the motor by stopping the engine is set.