Brake Control Device for Consistent Deceleration Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing brake control systems fail to ensure a consistent variation in velocity during brake operations across various circumstances, leading to potential inefficiencies and unnecessary decelerations.
Innovation Solution
A brake control device and method that calculates brake operation timing based on relative velocity between the host vehicle and an object, a predetermined variation in velocity, and deceleration, ensuring a consistent deceleration amount regardless of relative velocity, and also considers acceleration and deceleration of the object, as well as system delay time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake operation timing is calculated only based on relative velocity and collision risk, then brake response speed is improved, but deceleration amount becomes inconsistent across different circumstances
Solution Approach 1:
The patent applies parameter changes by incorporating multiple dynamic parameters (relative velocity, deceleration, acceleration, system delay time) into the brake operation timing calculation. This transforms the single-parameter approach into a multi-parameter system that adapts to varying circumstances, ensuring consistent deceleration amounts while maintaining rapid response.
2Device complexity
If brake operation is performed based on fixed timing rules, then system complexity is reduced, but unnecessary deceleration occurs in low velocity scenarios
Solution Approach 1:
The patent applies dynamics by making the brake operation timing calculation adaptive rather than fixed. The system dynamically adjusts the timing based on real-time parameters including relative velocity, deceleration, acceleration, and system delay time. This dynamic approach prevents unnecessary deceleration in low velocity scenarios while maintaining simple control logic through standardized calculation procedures.
3Ease of operation
If brake timing does not consider system delay time, then calculation simplicity is improved, but brake operation timing accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by incorporating system delay time into the brake operation timing calculation in advance. The control device pre-compensates for the known system delay, ensuring that the brake is activated at the precise moment needed to achieve the desired deceleration. This preliminary consideration of delay time maintains calculation simplicity while significantly improving timing accuracy.
Data Source
AI summary
A PCS ECU 20 in a PCS system 10 calculates TTC which is a brake operation timing of a host vehicle, on the basis of the relative velocity Vr between the host vehicle and an object, a predetermined deceleration amount ΔV caused by a brake operation of the host vehicle, and a deceleration a caused by the brake operation of the host vehicle. Thereby, the deceleration amount ΔV caused by the brake operation of the host vehicle is to be a set constant amount regardless of the relative velocity Vr between the host vehicle and the object. Accordingly, it is possible to ensure the deceleration amount ΔV caused by a more appropriate brake operation.