Hydraulic Brake Apparatus with Communication Flow Path for Pedal Feel
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Solution Overview
Problem
Conventional brake pedal simulators in brake-by-wire systems are affected by temperature and humidity changes, leading to inconsistent brake pedal feel and reduced durability, and often fail to differentiate between pedal pressurization and depressurization forces, causing discomfort for drivers.
Innovation Solution
A brake apparatus with a cylinder, piston, elastic member, and sealing member that divides the hydraulic chamber into two spaces, using a communication flow path to guide working fluid and apply damping forces, providing a hysteresis characteristic that distinguishes pedal pressurization and depressurization forces, thus enhancing pedal feel and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rubber damper is used in the brake pedal simulator, then the pedal simulator function is implemented, but the brake pedal feel varies with temperature and humidity changes
Solution Approach 1:
The patent replaces the rubber damper mechanical system with a hydraulic damping system using working fluid, a piston, and a communication flow path. This substitution eliminates temperature and humidity sensitivity while maintaining the pedal simulator function through hydraulic pressure and fluid flow resistance.
Solution Approach 2:
The patent implements a hydraulic system where working fluid flows through a communication flow path during piston movement. The hydraulic damping force is generated by forcing the working fluid through the communication flow path, providing consistent performance regardless of environmental conditions.
2Ease of operation
If a rubber damper is used in the brake pedal simulator, then the pedal simulator function is implemented, but the rubber damper hardens over time reducing durability
Solution Approach 1:
The patent replaces the rubber damper mechanical system with a hydraulic damping system using working fluid, a piston, and a communication flow path. This substitution eliminates temperature and humidity sensitivity while maintaining the pedal simulator function through hydraulic pressure and fluid flow resistance.
Solution Approach 2:
The patent changes the physical state and material properties from solid rubber (which degrades over time) to liquid hydraulic fluid (which remains stable). The working fluid maintains consistent viscosity and damping characteristics over time, eliminating the hardening issue associated with aged rubber dampers.
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 apparatus provides a consistent and differentiated pedal feel for drivers, maintaining braking performance across varying temperatures and humidity levels, and extends the durability of the brake system by stabilizing the elastic force and applying damping resistance effectively.
Implementation Method 1
an elastic member installed in the hydraulic chamber so as to elastically support the piston
Implementation Method 2
a communication flow path formed on the inner surface of the cylinder along the longitudinal direction of the cylinder, and guiding the working fluid of the hydraulic chamber to the opposite side of the moving direction of the piston
Data Source
AI summary
A brake apparatus for a vehicle may including: a cylinder including a supply flow path to supply working fluid of a reservoir and a hydraulic chamber connected to the supply flow path; a piston movably installed in the cylinder, and connected to a brake pedal; an elastic member installed in the hydraulic chamber so as to elastically support the piston; a sealing member installed on the outer surface of the piston so as to be in contact with the inner surface of the hydraulic chamber; and a communication flow path formed on the inner surface of the cylinder along the longitudinal direction of the cylinder, and guiding the working fluid of the hydraulic chamber to the opposite side of the moving direction of the piston, when the piston is moved.