Electric Hydraulic Brake Bypass Line for Faster Auxiliary Response

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Solution Overview

Problem

Conventional auxiliary braking systems in autonomous vehicles experience degraded hydraulic response performance due to the involvement of multiple solenoid valves, which limits the orifice size and results in delayed brake fluid delivery to wheel brake mechanisms.

Innovation Solution

The electric hydraulic brake apparatus incorporates a split line that bypasses specific solenoid valves in the auxiliary braking system, allowing brake fluid to directly reach the wheel brake mechanisms, and includes an on-off valve with a large orifice size upstream of the split line to enhance hydraulic response performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple solenoid valves are used in the auxiliary braking system to deliver brake fluid, then the braking control function is achieved, but the hydraulic response performance degrades due to limited orifice size

Engineering Contradiction:

Improvebraking control functionVSAvoidhydraulic response speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent segments the brake fluid delivery path into multiple channels: a first channel through solenoid valves for controlled braking, and a second channel through a bypass line with a large orifice valve for rapid hydraulic response. This segmentation allows each path to optimize for its specific function, resolving the contradiction between controlled braking and fast response.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bypass line with the large orifice valve acts as an intermediary pathway that provides an alternative route for brake fluid delivery. This intermediary channel bypasses the flow restrictions of the solenoid valves, enabling fast hydraulic response while the solenoid valves maintain braking control functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If multiple solenoid valves are involved in the auxiliary braking system, then braking control is achieved, but the delay time in brake fluid delivery increases

Engineering Contradiction:

Improvebraking controlVSAvoidbrake fluid delivery delay time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent divides the brake fluid delivery system into two segmented paths: one path through solenoid valves for precise braking control, and another path through a bypass line with a large orifice valve for rapid fluid delivery. This segmentation eliminates the delay caused by multiple solenoid valves in the control path while maintaining braking functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bypass line with the large orifice valve allows brake fluid to skip through the restrictive solenoid valve paths and rush directly to the wheel brake mechanisms. This skipping mechanism dramatically reduces the delivery delay time while the solenoid valves continue to provide necessary braking control.

Inventive Principle:

Principle #21Skipping (Rushing through)

3Speed

If a bypass line with large orifice valve is added to improve hydraulic response, then the response speed increases, but the device complexity increases

Engineering Contradiction:

Improvehydraulic response speedVSAvoidbrake system structure

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The bypass line with the large orifice valve serves as a simple intermediary component that adds minimal complexity to the system. It provides a direct alternative pathway for brake fluid without requiring complex control mechanisms, achieving fast hydraulic response with结构简单 (simple structure).

Inventive Principle:

Principle #24Intermediary (Mediator)

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 improves hydraulic response performance by reducing delay times in brake fluid delivery, ensuring faster and more effective braking response, especially during main braking system failures.

Implementation Method 1

a split line configured to receive the brake fluid delivered from the third hydraulic pressure input unit and supply the brake fluid to the plurality of wheel brake mechanisms

Methodology Applied

Scientific EffectHydraulic flow:

Implementation Method 2

includes an on-off valve with a large orifice size upstream of the split line to enhance hydraulic response performance

Methodology Applied

Scientific EffectFluid flow control through orifice:

Data Source

PatentUS11787377B2Method and apparatus for controlling electric hydraulic brake

Publication Date: 2023.10.17 HYUNDAI MOBIS CO LTD

AI summary

At least one embodiment of the present disclosure provides an electric hydraulic brake apparatus including a reservoir, a plurality of wheel brake mechanisms, a main braking system, and an auxiliary braking system, wherein the auxiliary braking system includes a first hydraulic pressure input unit and a second hydraulic pressure input unit, a third hydraulic pressure input unit configured to receive brake fluid from the main braking system without passing through booster valves, a first inlet line and a second inlet line configured to transfer a hydraulic pressure between the main braking system and the plurality of wheel brake mechanisms, and a split line configured to receive and supply the brake fluid delivered from the third hydraulic pressure input unit to the plurality of wheel brake mechanisms.