Vehicle Braking Control Using Accelerator-Aware Deceleration
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Solution Overview
Problem
Existing vehicle control systems fail to adequately account for the surrounding situation of a vehicle to prompt occupants, leading to improper control in potentially hazardous scenarios.
Innovation Solution
A vehicle control device that includes a recognizer to identify the surrounding situation, a driving state detector to assess the occupant's driving state, and a braking controller that adjusts deceleration based on the occupant's accelerator operation, with different deceleration settings for detected and undetected accelerator operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If deceleration control is performed with a fixed target deceleration value, then the control logic is simple, but the vehicle control is not appropriate for different surrounding situations and occupant states
Solution Approach 1:
The target deceleration value is made dynamic rather than fixed. The braking controller adjusts the target deceleration based on real-time detection of accelerator operation status, transitioning between different deceleration values according to the detected driving state. This dynamic adjustment enables the system to adapt to varying surrounding situations and occupant states without requiring complex manual reconfiguration.
Solution Approach 2:
The driving state detector continuously monitors the accelerator operation status and provides feedback to the braking controller. Based on this feedback, the braking controller automatically adjusts the target deceleration value, creating a closed-loop control system that adapts to changing conditions while maintaining relatively simple control logic through automated decision-making.
2Reliability
If the target deceleration is increased to improve safety response, then collision avoidance capability is enhanced, but occupant comfort and natural driving flow are degraded
Solution Approach 1:
The system changes the deceleration parameter based on the detected accelerator operation status. When accelerator operation is detected, a first (lower) target deceleration value is applied to maintain comfort and natural driving flow. When no accelerator operation is detected, a second (higher) target deceleration value is applied to enhance collision avoidance capability. This parameter adjustment strategy balances safety and comfort based on real-time driving state.
Solution Approach 2:
The deceleration control transitions from a static fixed value to a dynamic value that adapts to the detected driving state. The braking controller automatically switches between different deceleration levels based on accelerator operation detection, enabling the system to provide appropriate deceleration intensity for each situation without requiring manual intervention from the occupant.
3Loss of time
If deceleration control is applied without detecting accelerator operation, then response time is reduced, but the control may conflict with occupant intent and reduce drivability
Solution Approach 1:
The driving state detector continuously monitors accelerator operation status in advance before deceleration control is executed. This preliminary detection allows the braking controller to pre-determine the appropriate target deceleration value based on the current driving state, ensuring that when deceleration control is applied, it aligns with the occupant's intent and maintains natural driving flow while still providing timely response.
Data Source
AI summary
A vehicle control device of an embodiment includes a recognizer configured to recognize a surrounding situation of a host vehicle, a driving state detector configured to detect a driving state of an occupant of the host vehicle, and a braking controller configured to perform at least deceleration control based on a target deceleration of the host vehicle when determination is made that an obstacle is present in front of the host vehicle, in which the braking controller changes the target deceleration based on whether or not an accelerator operation of the occupant is detected by the driving state detector.