Brake Hydraulic Control Unit With Switchable Pulsation Damping
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Solution Overview
Problem
Conventional hydraulic control units for vehicle brake systems fail to effectively reduce pulsation in brake fluid, leading to weakened braking force when urgently needed, as the pulsation reduction mechanisms do not contribute to increasing hydraulic pressure in the wheel cylinder.
Innovation Solution
A hydraulic control unit with a pulsation reducing unit that actively varies the volume of an inflow chamber to adjust braking force and pulsation reduction based on the vehicle's braking mode, using a valve housing, movable core, and coil to control the flow of brake fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a pulsation reducing unit with a suppressing element is used to reduce pulsation of brake fluid discharged from the pump, then pulsation is reduced, but the braking force is weakened because the brake fluid does not contribute to increasing hydraulic pressure in the wheel cylinder
Solution Approach 1:
The pulsation reducing unit dynamically adjusts its pulsation reduction capability based on driving conditions. The controller selectively activates the pulsation reducing unit only when pulsation is harmful (e.g., during steady-state driving), while allowing pulsation to pass through when it contributes to useful braking force (e.g., during emergency braking). This dynamic control resolves the contradiction by making the pulsation reduction function conditional rather than constant.
Solution Approach 2:
The system changes the operational parameters of the pulsation reducing unit based on detected driving conditions. By monitoring parameters such as brake fluid flow rate, pressure changes, and pump operation state, the controller adjusts whether the pulsation reducing unit is active or inactive, thereby optimizing the balance between pulsation reduction and braking force generation under different operating conditions.
2Force
If the pump is driven to increase hydraulic pressure in the wheel cylinder, then braking force is improved, but pulsation is generated and transmitted to the engine room causing noise
Solution Approach 1:
The system employs feedback control by continuously monitoring the operating state of the pump and the characteristics of brake fluid flow. Based on this feedback, the controller determines whether the pump operation is generating harmful pulsation noise or contributing to necessary braking force, and accordingly activates or deactivates the pulsation reducing unit to maintain optimal performance while minimizing noise.
Solution Approach 2:
The controller changes the operational state of the pulsation reducing unit based on detected parameters such as pump discharge pressure, flow rate variations, and inferred noise levels. This parameter-based control allows the system to suppress pulsation noise during pump operation only when necessary, while preserving braking effectiveness when pulsation is beneficial.
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
This configuration allows for adjustable braking force and pulsation reduction, ensuring effective braking performance even in urgent situations by actively managing the inflow chamber's volume to balance braking force and pulsation reduction.
Implementation Method 1
a coil disposed in a manner to surround the valve housing and the fixed core
Implementation Method 2
a discharge channel from which a brake fluid is discharged, the brake fluid being pressurized by a pump
Data Source
AI summary
Examples relate to a hydraulic control unit that includes a pump for increasing a hydraulic pressure of a brake fluid. The hydraulic control unit includes a discharge channel from which the brake fluid pressurized by a pump is discharged, a pulsation reducing unit disposed in the middle of the discharge channel, and a controller controlling the pump and the pulsation reducing unit. The pulsation reducing unit includes a valve housing, a fixed core fixed to the valve housing, a movable core received in the valve housing in an axially movable manner, a closing member interlocking with the movable core and closing the discharge channel, a coil disposed in a manner to surround the valve housing and the fixed core, and an inflow chamber formed by the valve housing and one end surface of the movable core, into which the brake fluid flows, and whose volume can vary.