Electronic Control Device Noise Reduction via Grounded Electroconductive Member

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Solution Overview

Problem

Conventional electronic control devices for anti-lock brake systems (ABS) face malfunctions due to electrical noise from electrically-powered apparatus in the hydraulic control block interfering with pressure sensors, affecting their accuracy.

Innovation Solution

An electronic control device with a metal hydraulic control block, an electronic control mechanism, a pressure sensor, and an electroconductive member that connects the circuit board's negative electrode wire to the hydraulic control block, reducing electrical noise transmission to the pressure sensor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electrically-powered apparatus (electric motor, pressure-increasing valves, pressure-reducing valves) are provided in the hydraulic control block, then the brake control functionality is improved, but electrical noise is generated that interferes with the pressure sensor

Engineering Contradiction:

Improvebrake control functionalityVSAvoidelectrical noise interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

A shield member is introduced as an intermediary component between the electrically-powered apparatus and the pressure sensor. This shield member includes a ground potential terminal connected to the chassis ground, creating a reference potential that blocks electrical noise from reaching the pressure sensor while allowing the electrically-powered apparatus to function normally

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the pressure sensor is positioned to directly face the hydraulic passage for accurate detection, then the measurement precision is improved, but the sensor becomes more susceptible to electrical noise from nearby apparatus

Engineering Contradiction:

Improvehydraulic pressure detection accuracyVSAvoidelectrical noise susceptibility

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The shield member acts as a protective intermediary positioned between the pressure sensor and the electrically-powered apparatus. It maintains the pressure sensor's optimal positioning for accurate hydraulic passage detection while blocking electrical noise through its grounded structure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The shield member creates an electrically inert environment around the pressure sensor by establishing a ground potential barrier. This electromagnetic shielding effect isolates the sensor from external electrical interference, similar to how an inert atmosphere protects from chemical reactions

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Measurement precision

If the sensor body with integrated circuits and condensers is integrally held in the component holder, then the sensor accuracy is improved, but the electrical noise from powered apparatus can be transmitted to the sensor

Engineering Contradiction:

Improvesensor accuracyVSAvoidsensor malfunction risk

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The shield member is positioned to protect the sensor body and its integrated circuits from electrical noise. The grounded shield creates a protective barrier that allows the sensor to maintain its integrated design while reducing malfunction risk from electrical interference

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 effectively suppresses output fluctuations in the pressure sensor, ensuring stable brake fluid pressure control by minimizing electrical noise interference.

Implementation Method 1

an electroconductive member for conducting a negative electrode wire of the circuit board and the hydraulic control block

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS10960861B2Electronic control device

Publication Date: 2021.03.30 ASTEMO LTD

AI summary

An electronic control device is provided with a hydraulic control block made of an aluminum alloy, a synthetic-resin component holder configured to hold electronic components such as a pressure sensor, and a printed board for controlling driving of hydraulic control apparatus via the component holder. Electrode terminals of the pressure sensor are connected to the printed board, a terminal configuration part of an electroconductive member, which is inserted into an insertion hole of a body wall of the component holder, is connected to a negative electrode wiring of the printed board, and the outer end edge of an elastic contact part of the electroconductive member is brought into elastic-contact with the hydraulic control block, to establish conduction therebetween. Hence, the electric potential difference between the pressure sensor and the hydraulic control block can be canceled, thus reducing an electrical noise of the pressure sensor.