Electrically Actuated Booster Variable Displacement Control

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Solution Overview

Problem

Existing electrically actuated boosters for automotive brake mechanisms cannot control the relative displacement relationship between the input member and the assist member, limiting their ability to vary brake characteristics and improve brake feeling.

Innovation Solution

An electrically actuated booster with input absolute displacement detecting means, relative displacement detecting means, and assist absolute displacement detecting means, along with control means that adjusts the relative displacement relationship based on detected signals to vary the brake fluid pressure and assist thrust, allowing for variable brake characteristics and improved brake feeling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the relative displacement between the input member and the assist member is kept constant, then the booster structure is simple, but the brake characteristics cannot be varied

Engineering Contradiction:

Improvebrake characteristics variabilityVSAvoiddisplacement control system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic displacement control where the relative displacement between the input member and assist member is no longer fixed but is actively controlled to vary according to brake fluid pressure conditions. The controller adjusts the assist member's position dynamically during braking operations, enabling variable brake characteristics including enhanced feel in low pressure regions and adjusted boost ratios throughout the braking stroke.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent employs feedback control by detecting the absolute displacement of the input member and using this information to control the electrically-operated actuator. The controller continuously monitors the input member's position and adjusts the assist member's displacement accordingly, creating a closed-loop system that optimizes brake characteristics based on real-time operating conditions.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the assist member is controlled to move together with the input member, then the force transmission is efficient, but the relative displacement relationship cannot be varied

Engineering Contradiction:

Improverelative displacement controlVSAvoidforce transmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system transitions from static synchronized movement to dynamic relative displacement control. The electrically-operated actuator independently controls the assist member's position, allowing the relative displacement between input and assist members to vary dynamically while maintaining reliable force transmission through the braking system.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The electrically-operated actuator serves as an intermediary device between the input member and assist member, enabling independent control of the assist member's displacement. This intermediary mechanism allows the system to decouple the movements of the input and assist members while maintaining effective force transmission through controlled interaction.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If no absolute displacement detection is implemented, then the device complexity is low, but the relative displacement relationship cannot be controlled according to input member position

Engineering Contradiction:

Improvedisplacement-based control capabilityVSAvoiddetection and control system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements feedback control by detecting the absolute displacement of the input member and using this information to control the electrically-operated actuator. The controller continuously monitors the input member's position and adjusts the assist member's displacement accordingly, creating a closed-loop system that optimizes brake characteristics based on real-time operating conditions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces purely mechanical displacement control with an electrically-controlled system. The electrically-operated actuator uses electrical signals and control algorithms to manage the assist member's position, substituting complex mechanical linkages with more flexible electrical control mechanisms that can precisely adjust relative displacement relationships.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9291175B2Electrically actuated booster

Publication Date: 2016.03.22 ASTEMO LTD

AI summary

An electrically actuated booster performs displacement control such that the relative displacement relationship between an input member and an assist member is variable according to the absolute displacement of the input member. A target displacement that makes variable the relative displacement relationship between an input piston and a booster piston is set according to a detection signal from a potentiometer (86), and displacement control is performed so that the relative displacement between the two pistons becomes equal to the target displacement on the basis of a signal from a relative displacement sensor (100) that detects the relative displacement between the two pistons.