Driving Assist Device Deceleration Control Logic
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driving assist devices do not effectively coordinate deceleration assists with driver brake operations, leading to potential deviations in target position accuracy during vehicle deceleration.
Innovation Solution
A driving assist device with an electronic control unit that determines whether the target position can be decided based on recognized objects, switching between driver-priority and system-priority deceleration assists to ensure accurate deceleration to the target velocity while cooperating with driver brake operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving assist device performs active intervention in driving (second assist), then the vehicle can be decelerated to target velocity before reaching target position, but the position where deceleration is completed may deviate from proper target position
Solution Approach 1:
The system dynamically switches between two assist modes (first assist with driver priority and second assist with system priority) based on recognition reliability. When recognition reliability is high, the system applies stronger deceleration intervention; when reliability is low, it reduces intervention and prioritizes driver input. This dynamic adaptation resolves the contradiction by adjusting the level of active intervention according to the confidence in target position identification.
2Reliability
If the driving assist device performs strong active intervention (second assist), then deceleration to target velocity is ensured, but driver input may be overridden leading to reduced driver control
Solution Approach 1:
The system changes the parameter of assist intensity based on recognition reliability. When reliability is high, the system applies higher deceleration force (second assist); when reliability is low, it applies lower deceleration force and prioritizes driver brake input (first assist). This parameter adjustment allows the system to guarantee deceleration when confident in its recognition while preserving driver control when uncertain.
3Ease of operation
If the driving assist device performs weak active intervention (first assist), then driver control is maintained, but the vehicle may not be decelerated to target velocity before reaching target position
Solution Approach 1:
The system dynamically adjusts the level of active intervention based on recognition reliability. When reliability is low, it uses first assist with weaker intervention to maintain driver control; when reliability is high, it switches to second assist with stronger intervention to guarantee deceleration. This dynamic switching resolves the contradiction by adapting intervention strength to the confidence in target position recognition.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In a driving assist device, an electronic control unit (12) is configured to determine whether a target position is able to be decided from a predetermined object indicating that a vehicle (1) needs to be decelerated, when recognizing the predetermined object, to perform a first assist by which the vehicle is decelerated at a first deceleration that is changed based on a brake operation by a driver, when determining that the target position is not able to be decided, and to perform a second assist by which the vehicle is decelerated at a second deceleration that is equal to or higher than a predetermined deceleration necessary to decelerate the vehicle to the target velocity before the vehicle reaches the target position decided from the predetermined object, when determining that the target position is able to be decided.