Vehicle Deflection Control Adaptive Brake Pre-Boost
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing deflection control systems for vehicles experience frequent operating noise issues due to the reduction of pre-boosted brake fluid pressure, which is often necessary to prevent lane departure, as the pressure reducing valve operates noisily when the driver engages the brake pedal.
Innovation Solution
A deflection control apparatus that strategically pre-boosts brake fluid pressure only when necessary, using a controller to determine the departure angle and apply a boost trajectory, thereby reducing the frequency of pressure reducing valve noise by optimizing the pre-boost timing and frequency based on the vehicle's departure angle and lane departure likelihood.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake fluid pressure is pre-boosted in advance at low departure possibility level, then lane departure prevention readiness is improved, but operating noise from pressure reducing valve increases when driver operates brake pedal
Solution Approach 1:
The patent applies dynamics by making the pre-boost control strategy adaptive rather than static. The controller dynamically adjusts whether to pre-boost brake fluid pressure based on real-time evaluation of multiple parameters including departure possibility level, vehicle speed, and departure angle. This dynamic control optimizes the balance between maintaining lane departure prevention readiness and minimizing unnecessary pre-boost operations that would trigger noisy pressure reduction when the driver applies brakes.
Solution Approach 2:
The patent changes the parameter of pre-boost decision-making from a simple binary state (pre-boost or not) to a multi-parameter evaluation system. By introducing departure angle and vehicle speed as additional parameters alongside departure possibility level, the system precisely determines when pre-boost is truly necessary, thereby reducing unnecessary pre-boost operations and the subsequent operating noise from pressure reducing valve when drivers apply brakes.
2Reliability
If brake fluid pressure is pre-boosted all the time at low departure possibility level, then lane departure prevention capability is improved, but frequency of pressure reducing valve operation increases causing more noise
Solution Approach 1:
The system transitions from static continuous pre-boost to dynamic conditional pre-boost. The controller continuously monitors departure angle, vehicle speed, and departure possibility level, adjusting the pre-boost state in real-time. This dynamic approach maintains lane departure prevention capability while significantly reducing the frequency of unnecessary pre-boost operations and subsequent pressure reducing valve operations.
Solution Approach 2:
The patent applies partial action by providing pre-boost only when truly needed rather than continuously. By evaluating multiple parameters including departure angle greater than predetermined angle, vehicle speed, and departure possibility level, the system provides just enough pre-boost to maintain safety capability while avoiding excessive pre-boost operations that would lead to frequent pressure reduction and noise.
3Speed
If departure angle threshold is lowered to trigger pre-boost more easily, then lane departure prevention responsiveness is improved, but unnecessary pre-boost operations increase causing more noise
Solution Approach 1:
The patent changes the control parameters from a single departure possibility level to a multi-parameter system including departure angle, vehicle speed, and departure possibility level. This parameter expansion allows the system to respond quickly to genuine lane departure risks while filtering out false alarms that would trigger unnecessary pre-boost operations and subsequent noise.
Solution Approach 2:
The system uses feedback from multiple sensors (departure angle sensor, vehicle speed sensor, and departure possibility determination) to make informed pre-boost decisions. This multi-source feedback mechanism ensures that pre-boost is triggered only when truly necessary, maintaining responsiveness to real risks while avoiding unnecessary operations that would cause noise when drivers apply brakes.
Data Source
AI summary
A deflection control apparatus is provided with: a controller programmed to: a determine whether or not a vehicle is about depart from a driving lane, perform a deflection control of supplying a brake fluid pressure to at least one of brake mechanisms provided for corresponding wheels so that a yaw moment in a direction of avoiding departure of the vehicle is applied to the vehicle, if it is determined that the vehicle is about to depart, arithmetically operate a departure angle of the vehicle, and arithmetically operate a boost trajectory for boosting the brake fluid pressure to a target brake fluid pressure on condition that the departure angle is greater than a predetermined angle. The controller is programmed to perform the deflection control after boosting in advance the brake fluid pressure associated with the at least one of the plurality of brake mechanism, on the basis of the boost trajectory.