Vehicle Deflection Control Reducing Brake Noise
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Solution Overview
Problem
The existing deflection control apparatuses for vehicles generate operating noise due to the transmission of brake fluid pressure, causing discomfort to drivers when applying braking force differences between wheels to prevent lane departure.
Innovation Solution
A deflection control apparatus that determines the vehicle's motion state and applies braking force to the front or rear wheel closer to the fluid pressure source when the vehicle is about to depart from the lane, reducing noise by minimizing fluid pressure transmission through occupant compartments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If braking force is applied to prevent lane departure by using braking force difference between left and right wheels, then vehicle deflection control effectiveness is improved, but operating noise from brake fluid pressure transmission increases
Solution Approach 1:
The patent applies different braking strategies based on the vehicle's motion state. For regular-use areas (small lateral velocity and departure angle), only the front wheel opposite to departure direction is braked. For other areas, both front and rear wheels opposite to departure direction are braked. This localized differentiation reduces noise in common scenarios while maintaining effectiveness in all scenarios.
Solution Approach 2:
Instead of applying braking force to all wheels or using excessive braking force, the patent applies partial braking force only to the necessary wheel(s) based on the motion state. This partial action approach minimizes brake fluid pressure transmission and associated noise while providing sufficient deflection control effectiveness.
2Reliability
If braking force is applied to both front and rear wheels on the opposite side, then deflection control effectiveness is improved, but noise from fluid pressure transmission through brake pipes increases
Solution Approach 1:
The control apparatus differentiates between regular-use areas and other areas, applying braking force to different wheel configurations. In regular-use areas where most lane departure events occur, only front wheel braking is applied, reducing noise. In other areas, both front and rear wheel braking is applied to maintain effectiveness.
Solution Approach 2:
The patent uses partial action by braking only the front wheel in regular scenarios, which covers the majority of lane departure cases. This reduces noise from brake pipe pressure transmission while maintaining sufficient control effectiveness for common operating conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents lane departure while significantly reducing the operating noise associated with brake fluid pressure transmission, enhancing driver comfort by optimizing braking force application based on vehicle motion states.
Implementation Method 1
a pressure of brake fluid is transmitted to a wheel cylinder provided on the wheel via a brake pipe
Implementation Method 2
apply braking forces to the corresponding wheels due to fluid pressures supplied to the plurality of brake mechanisms
Data Source
AI summary
A deflection control apparatus is provided with: a determinator configured to determine whether or not a vehicle is about to depart from a driving lane; and a controller programmed to perform a deflection control for controlling a braking apparatus to supply a fluid pressure to at least one of brake mechanisms corresponding to a front wheel and a rear wheel on a side opposite to a departure direction of the vehicle. The controller is programmed to control the braking apparatus to supply the fluid pressure to the brake mechanism that is close to a fluid pressure source, out of the brake mechanisms corresponding to the front wheel and the rear wheel on the opposite side, on condition that a motion state corresponds to a regular-use area of the braking apparatus, if it is determined that the vehicle is about to depart from the driving lane.