Brake Control Timing for Road Step Vibration Suppression
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Solution Overview
Problem
Existing brake control devices experience delays in generating the required braking force when encountering road steps or roughness, leading to insufficient impact mitigation and pitch suppression, resulting in uncomfortable braking forces for the driver.
Innovation Solution
A brake control system that includes a traveling environment estimation unit to determine the timing for braking based on vehicle speed and road conditions, selecting the appropriate wheel for braking, calculating the necessary braking force, and adjusting the braking start timing to account for motor response delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If brake control is applied to all wheels before vehicle runs over the step, then impact mitigation effect is improved, but braking timing becomes inaccurate and driver comfort deteriorates
Solution Approach 1:
The patent divides the wheel set into two groups: first wheels (front or rear) that detect the step first, and second wheels that will encounter the step later. Braking control is applied selectively to the second wheels based on calculated timing, rather than applying braking to all wheels simultaneously. This segmentation allows precise timing control for each wheel group, improving both impact mitigation and timing accuracy.
Solution Approach 2:
The control device calculates the timing at which second wheels will be affected by the step in advance, before the vehicle actually encounters it. By determining the arrival time of second wheels at the step location and initiating braking control beforehand, the system ensures that braking force is applied at the optimal moment, improving both impact mitigation and timing precision.
2Object-affected harmful factors
If braking force is applied at calculated timing, then vehicle body vibration suppression is improved, but system complexity increases due to timing calculation requirements
Solution Approach 1:
The control device continuously monitors wheel behavior to detect when a first wheel encounters a step, using this feedback information to trigger timing calculations and subsequent braking control for second wheels. This feedback mechanism enables the system to respond dynamically to actual road conditions, effectively suppressing vehicle body vibration while keeping the control logic relatively simple and event-driven.
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 suppresses vehicle body vibrations during travel on steps or rough surfaces, enhancing safety and ride comfort by ensuring timely and appropriate braking forces are applied.
Implementation Method 1
a power mechanism that is configured by a motor and a speed reducer provided in each wheel and is pressed by a piston that is linearly moved by a rotational-linear motion conversion mechanism
Implementation Method 2
a hydraulic mechanism that is configured by an electric pump and a valve and is pressed by a piston that is linearly moved by hydraulic pressure
Implementation Method 3
the brake pad generates a braking force on the wheels
Data Source
AI summary
Provided is a high-performance brake control device capable of effectively suppressing a vehicle body vibration generated during traveling on a road with a step or roughness. The brake control device includes a traveling environment estimation unit that estimates a traveling environment from a behavior of a first wheel that is any one of a plurality of wheels provided in a vehicle, and a timing calculation unit that calculates a timing at which a second wheel different from the first wheel is affected by the traveling environment, based on a vehicle speed. The plurality of wheels includes any one wheel that is controlled as for braking based on an estimation result of the traveling environment estimation unit and a calculation result of the timing calculation unit.