Brake-by-wire Initialization Sequence for Vehicle Stability

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Solution Overview

Problem

Brake-by-wire systems face challenges in maintaining braking stability and control, especially on inclined roads, due to simultaneous removal of clamping force from all wheels during initialization, which can lead to loss of vehicle control and driver discomfort.

Innovation Solution

Implementing a time sequence initializing method for Electro Wedge Brakes (EWBs) at front wheels and Electro Mechanical Brakes (EMBs) at rear wheels, where initialization is performed in separate or simultaneous types based on road conditions, ensuring that clamping force is maintained at all wheels during the process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If initialization is performed simultaneously on all wheels, then the initialization process is completed quickly, but the vehicle loses braking stability and control especially on inclined roads

Engineering Contradiction:

Improveinitialization speedVSAvoidbraking stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The initialization process is divided into separate phases: front wheel initialization followed by rear wheel initialization. This segmentation prevents all wheels from losing clamping force simultaneously, maintaining vehicle stability while still completing the initialization process efficiently.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If clamping force is removed from all wheels simultaneously during initialization, then the actuator diagnosis and pad wear compensation can be performed, but the vehicle may move unexpectedly and driver control is lost

Engineering Contradiction:

Improveactuator diagnosis capabilityVSAvoiddriver control

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The system performs preliminary initialization of front wheels before rear wheels, ensuring that at least some braking force remains during the process. This preliminary action sequence allows actuator diagnosis and pad wear compensation while maintaining driver control and preventing unexpected vehicle movement.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If initialization is performed in time sequence with front wheels first, then braking stability is maintained, but the initialization process takes longer

Engineering Contradiction:

Improvebraking stabilityVSAvoidinitialization time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The initialization is performed in periodic phases: first phase initializes front wheels, second phase initializes rear wheels. This periodic approach balances braking stability maintenance with reasonable initialization time, avoiding unnecessary delays while ensuring safety.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8668282B2Initializing method of brake-by-wire system in vehicle

Publication Date: 2014.03.11 HYUNDAI MOBIS CO LTD

AI summary

A brake-by-wire system uses a time sequence type that determines road conditions before initialization, initializes EWBs (Electro Wedge Brake) at the left/right front wheels and EMBs (Electro Mechanical Brake) at the left/right rear wheels with time differences on the basis of the determined road conditions. Therefore, the clamping force in at least any one of the EWBs and the EMBs is maintained in any circumstances, thereby avoiding a situation that all the braking force of a vehicle is removed.