Autonomous Driving Shift Control for Standstill-Only Gear Changes
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Solution Overview
Problem
Existing vehicle platforms lack the ability to appropriately perform shift changes in response to commands from autonomous driving systems, particularly when the vehicle is in motion, leading to potential instability.
Innovation Solution
The vehicle platform is configured to perform shift changes only when the vehicle is at a standstill, as indicated by a signal, and may also include commands for deceleration to ensure stable vehicle control during autonomous mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the vehicle platform performs shift changes in response to commands from the autonomous driving system while the vehicle is traveling, then the autonomous driving function can be fully utilized, but the vehicle may travel unstably
Solution Approach 1:
The system applies preliminary anti-action by detecting the vehicle's moving state before executing shift changes. When the vehicle is detected to be traveling (not in standstill), the system proactively suppresses shift change commands from the autonomous driving system, preventing potential instability before it occurs. This is achieved through the moving state detection unit and control unit that work together to block inappropriate shift changes.
Solution Approach 2:
The vehicle platform introduces an intermediary control unit that mediates between the autonomous driving system and the shift change execution. This intermediary layer receives shift change requests from the autonomous driving system, checks the vehicle's moving state, and only permits shift changes when the vehicle is in standstill. This mediator ensures stable vehicle control while still allowing autonomous driving functionality.
2Stability of the object's composition
If the vehicle platform restricts shift changes to only when the vehicle is at standstill, then vehicle stability is maintained, but the responsiveness of the autonomous driving system is reduced
Solution Approach 1:
The system uses preliminary action by continuously monitoring and detecting the vehicle's moving state in advance. The moving state detection unit keeps track of whether the vehicle is in standstill or traveling, so when shift change commands are received, the system can immediately determine whether to execute them based on the pre-detected state, maintaining responsiveness without compromising stability.
Solution Approach 2:
The system applies dynamics by making the shift change permission conditional on the vehicle's real-time moving state. Rather than a fixed restriction, the system dynamically adjusts its responsiveness: it permits shift changes when the vehicle is in standstill (maintaining stability) and suppresses them when traveling (preventing instability). This dynamic approach optimizes both stability and responsiveness based on current operating conditions.
Data Source
AI summary
A vehicle comprises an autonomous driving system and a vehicle platform that controls the vehicle in response to a command received from the autonomous driving system. In the vehicle, when a first signal indicates an autonomous mode, the vehicle platform performs a shift change requested through a first command only while the second signal indicates a standstill.