Pre-Stop Brake Force Control for Smooth Vehicle Stopping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing braking control devices increase braking distance and fail to consider driver operation changes immediately before vehicle stops, leading to unpredictable acceleration changes.
Innovation Solution
A braking control device that adjusts braking force through pre-stop braking control, including reduction and increase controls, to minimize braking distance changes and reflect driver operations, using sensors and monitoring devices to calculate and adjust braking forces based on driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the braking force is reduced immediately before the vehicle stops, then the amount of change in forward and backward acceleration is reduced, but the braking distance is increased
Solution Approach 1:
The control device executes increase control before reduction control to preliminarily adjust the braking force profile. By increasing braking force before the reduction phase, the system compensates for the extended braking distance that will result from the subsequent force reduction, thereby maintaining both acceleration stability and acceptable braking distance
Solution Approach 2:
The system dynamically changes the braking force parameter through two-phase control: first increasing the braking force above required levels, then reducing it below required levels. This parameter modulation allows the system to achieve smooth acceleration transitions while compensating for distance extensions through the initial force increase
2Stability of the object's composition
If the braking force is controlled immediately before the vehicle stops, then the acceleration change is smoothed, but the driver's operation input is not sufficiently considered
Solution Approach 1:
The control device continuously monitors the operation amount of the braking operation member and uses this feedback to adjust the braking force control strategy. The ECU determines whether to execute increase or reduction control based on real-time driver input, ensuring that automated braking adjustments remain responsive to driver intentions while still providing acceleration smoothing
Data Source
AI summary
A braking control device executes pre-stop braking control to adjust a braking force when a vehicle stops. The pre-stop braking control includes reduction control that reduces the braking force, and increase control that is executed before the reduction control is started, to increase the braking force. An increasing unit executes the increase control, and a reducing unit executes the reduction control. A calculation unit calculates a braking distance extended by the reduction control, as an extended distance, and calculates a braking distance shortened by the increase control, as a shortened distance. The calculation unit calculates the extended distance to become longer when an operation amount of a braking operation member operated by a driver is reduced during braking than when the operation amount is not reduced. When a difference between the extended distance and the shortened distance is less than a determination value, the reducing unit starts the reduction control.