Brake Control Device Valve Vibration Suppression
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Solution Overview
Problem
Existing brake control systems for vehicles fail to effectively suppress vibration of the check valve in fluid pumps, leading to abnormal noise during the shutdown of the fluid pump, which affects the smooth operation of the braking system.
Innovation Solution
A brake control device that adjusts fluid pressure in the wheel cylinder using electromagnetic valves and a fluid pump driven by an electric motor, with a controller managing the valves to set them to a close position before shutdown, ensuring the valve body is forcibly pressed against the valve seat, thereby suppressing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fluid pump rotation is reduced and stopped, then the flow rate of brake fluid decreases, but the valve body vibrates within the conical surface immediately before stop causing abnormal noise
Solution Approach 1:
The controller executes vibration suppression control immediately before the fluid pump rotation is stopped, closing the first and second electromagnetic valves to enclose the brake fluid and press the valve body against the valve seat, preventing vibration and abnormal noise before they occur
2Quantity of substance
If the gap between valve body and valve seat becomes small immediately before pump stop, then flow rate decreases, but non-uniform flow in the gap causes valve body to vibrate
Solution Approach 1:
The brake fluid acts as an intermediary medium that, when enclosed by closing the electromagnetic valves, transmits pressure to forcibly press the valve body against the valve seat, stabilizing the valve body and preventing vibration during the shutdown phase
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
The solution effectively suppresses valve body vibration and associated noise by maintaining the brake fluid enclosed state during fluid pump shutdown, ensuring a stable braking operation and reducing driver discomfort.
Implementation Method 1
first electromagnetic valve (UP) provided in the fluid passage (H)... second electromagnetic valve (VI) provided in the fluid passage (H)
Implementation Method 2
fluid pump (QL) that is driven by an electric motor (ML)
Implementation Method 3
The fluid force caused by the flow of the hydraulic fluid (e.g., the brake fluid) and the elastic force caused by the elastic body (compression spring) act on the ball (sphere) of the check valve
Implementation Method 4
the elastic force caused by the elastic body (compression spring) act on the ball (sphere) of the check valve
Data Source
AI summary
A brake control device adjusts a fluid pressure of a brake fluid in a wheel cylinder, and is provided with: a fluid passage which connects a master cylinder and the wheel cylinder; a first electromagnetic valve which is provided in the fluid passage; a second electromagnetic valve which is provided in the fluid passage between the first electromagnetic valve and the wheel cylinder; a fluid pump which is driven by an electric motor, suctions the brake fluid from the fluid passage at a suction part between the first electromagnetic valve and the second electromagnetic valve, and discharges the brake fluid to the fluid passage at a discharge part between the first electromagnetic valve UP and the second electromagnetic valve; a check valve which is provided between the fluid pump and the discharge part; and a controller which controls the first electromagnetic valve, the second electromagnetic valve, and the electric motor.