Vehicle Brake Control Device Compact Design
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Solution Overview
Problem
Existing vehicle brake control systems face challenges in reducing the longitudinal dimension of brake control devices for improved mountability on vehicles while maintaining effective braking performance.
Innovation Solution
A vehicle brake control device that adjusts front and rear wheel liquid pressures using an electric pump and electromagnetic valve, eliminating the need for a master chamber in the rear wheel cylinder, allowing for direct introduction of adjusted liquid pressure to the servo chamber, and utilizing reflux of brake liquid for pressure adjustment, enabling precise control and reduced device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a tandem-type slave cylinder with ball screw shaft is used to generate brake liquid pressure, then braking force control is achieved, but the longitudinal dimension increases
Solution Approach 1:
The patent extracts the brake liquid pressure generation function from the mechanical slave cylinder system and relocates it to an electric pump. This separates the pressure generation function from the mechanical transmission components (ball screw shaft), allowing the slave cylinder to be simplified and reduced in length while maintaining brake liquid pressure generation capability through direct electric pump supply.
Solution Approach 2:
The patent replaces the mechanical slave cylinder with ball screw shaft mechanism with an electric pump-based hydraulic system. The electric pump directly generates brake liquid pressure without requiring mechanical conversion components, substituting mechanical power transmission with direct hydraulic pressure generation, thereby reducing the longitudinal dimension of the slave cylinder.
2Ease of operation
If a reaction force chamber is provided at the end of the master cylinder, then input piston movement control is achieved, but the center axis dimension increases
Solution Approach 1:
The patent relocates the reaction force chamber from the axial end position to a radial position on the side surface of the master cylinder. This dimensional change allows the reaction force chamber to be formed without extending the center axis length, maintaining input piston movement control capability while reducing the overall axial dimension of the master cylinder assembly.
3Length of moving object
If adjusted liquid pressure is directly introduced to the rear wheel cylinders, then device compactness is improved, but pressure control precision must be maintained
Solution Approach 1:
The patent incorporates a pressure sensor that detects the adjusted liquid pressure and feeds this information back to the control unit. The control unit adjusts the electric pump operation based on this feedback to maintain precise pressure control, enabling direct introduction of adjusted liquid pressure to rear wheel cylinders while ensuring measurement precision is maintained through closed-loop control.
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 achieves a compact design with improved mountability, enhanced control accuracy in low-pressure regions, and sufficient braking force, while allowing for independent control of front and rear wheel systems for optimized energy regeneration and vehicle stability.
Implementation Method 1
an electric pump (DC) that pumps the brake liquid (BF) from the reservoir (RV)
Implementation Method 2
an electromagnetic valve (UC), and that adjusts a brake liquid (BF) discharged by the electric pump (DC) to an adjusted liquid pressure (Pc) using the electromagnetic valve (UC)
Implementation Method 3
a master piston (PM) that generates, in an advancing direction (Ha), an advancing force (Fa) by the adjusted liquid pressure (Pc) applied to a servo chamber (Rs), against a retreating force (Fb)
Implementation Method 4
a master elastic body (SM) that is interposed between the master piston (PM) and the bottom portion (Mt) of the master cylinder (CM) and that presses the master piston (PM) in the retreating direction (Hb)
Implementation Method 5
a brake caliper that applies a brake pad to a rotating member (KT) of the wheel (WH)
Data Source
AI summary
A brake control device including a pressure adjusting unit including an electric pump and an electromagnetic valve, and that adjusts, using the electromagnetic valve, a brake liquid discharged by the electric pump to an adjusted liquid pressure and introduces the adjusted liquid pressure to the wheel cylinders of the rear wheels; and a master unit that includes a master cylinder and a master piston, and that includes a master chamber connected to the wheel cylinders of the front wheels and a servo chamber to which the adjusted liquid pressure is introduced and which provides, to the master piston, an advancing force that opposes a retreating force applied to the master piston by the master chamber.