Hybrid Vehicle Mode Control for Stable Driver-Selected Operation
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Solution Overview
Problem
Conventional hybrid vehicles cause driver discomfort due to frequent switching between driving modes, especially when the driver's intention is not reflected in mode changes or when mode switches are rejected or cancelled within a short period.
Innovation Solution
Implement a controller that maintains the normal driving mode for a predetermined time after a mode selection switch operation, regardless of driving support plan requests, to reduce discomfort from rapid mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving support plan automatically switches to motor driving mode based on energy efficiency, then energy consumption is reduced, but driver intention is not reflected causing discomfort
Solution Approach 1:
The system dynamically adjusts the response to driving support plan requests based on the temporal relationship with driver operations. When a driver's mode selection operation occurs within a predetermined time after a driving support plan request, the system prioritizes the driver's intention by suppressing the automatic mode switch. This dynamic adjustment resolves the contradiction by making the system adaptable to driver behavior patterns while maintaining energy efficiency when no driver intervention occurs.
2Ease of operation
If the mode selection switch responds immediately to driver input, then driver intention is reflected, but rapid switching causes discomfort
Solution Approach 1:
The system applies preliminary anti-action by suppressing the driving support plan's mode switch request when it detects that the driver has operated the mode selection switch within a predetermined time period. This pre-emptive suppression prevents the harmful effect of rapid mode switching before it occurs, maintaining stability while still responding to driver intention. The system anticipates potential instability from rapid switching and counteracts it in advance.
3Use of energy by moving object
If the driving support plan frequently switches modes to optimize energy efficiency, then energy consumption is reduced, but driver discomfort increases due to frequent transitions
Solution Approach 1:
The system performs preliminary action by checking the timing of driver operations before executing the driving support plan's mode switch request. When a driver's mode selection operation is detected within the predetermined time period, the system preemptively suppresses the automatic mode switch. This preliminary check and suppression mechanism prevents driver discomfort from frequent mode transitions while maintaining energy efficiency for transitions that align with driver intentions.
Data Source
AI summary
The controller of a hybrid vehicle maintains the normal driving mode even if there is a request to switch to the motor driving mode based on the driving support plan until a predetermined time has elapsed when the mode is switched to the normal driving mode by operating the mode selection switch. As a result, the driver's sense of discomfort can be reduced by switching to the motor driving mode within a short time after switching to the normal driving mode by operating the mode selection switch.