EV Creep Torque Control for Autonomous Mode Power Saving
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Solution Overview
Problem
In electrified vehicles, power consumption is not sufficiently suppressed when prioritizing response to acceleration requests in autonomous driving mode, leading to inadequate electric efficiency.
Innovation Solution
The electrified vehicle includes a control device that switches between manual and autonomous driving modes, cutting creep torque when a creep cut condition is met and relaxing this condition in autonomous driving mode compared to manual driving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the same creep cut condition is used in both manual and autonomous driving modes, then the response to acceleration requests in manual mode is prioritized, but power consumption in autonomous mode is not sufficiently suppressed
Solution Approach 1:
The creep cut condition is made dynamic by switching between two different sets of conditions depending on the driving mode. In manual driving mode, the first creep cut condition applies (prioritizing acceleration response). In autonomous driving mode, the second creep cut condition applies (prioritizing power consumption suppression). This dynamic adaptation resolves the contradiction by allowing each mode to have optimized conditions for its primary objective.
Solution Approach 2:
The patent changes the parameters of the creep cut condition based on driving mode. Specifically, it modifies the vehicle speed threshold and brake state requirements differently for manual versus autonomous modes. This parameter change enables the system to suppress power consumption in autonomous mode while maintaining responsive acceleration capability in manual mode.
2Loss of energy
If creep torque is cut more aggressively in autonomous driving mode, then electric efficiency is improved, but the vehicle may not respond adequately to unexpected acceleration needs
Solution Approach 1:
The system dynamically adjusts the creep cut condition based on the autonomous driving mode, making the torque cutting behavior adaptive rather than fixed. This allows the system to optimize for energy efficiency when needed while maintaining the capability to provide torque when required for safety or unexpected situations.
Solution Approach 2:
The control device continuously monitors driving mode and vehicle state to determine whether to apply the first or second creep cut condition. This feedback mechanism ensures that the appropriate condition is applied based on current operational context, balancing energy efficiency with responsiveness to acceleration needs.
Data Source
AI summary
An electrified vehicle includes a drive device including a driving motor for traveling and a power storage device for exchanging electric power with the motor, a drive device that controls the drive device so as to travel by switching between the manual driving mode and the automated driving mode, and a control device that cuts the creep torque when the creep torque is satisfied when the creep torque is outputted from the motor. In the automatic operation mode, the control device relaxes the creep cut condition as compared with the manual operation mode.