Brake Control Logic With Reverse Shift on Slippery Roads

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Solution Overview

Problem

Existing anti-lock braking systems (ABS) and electronic stability controls (ESC) may increase braking distances and worsen vehicle control on slippery roads, particularly when sudden obstacles are encountered.

Innovation Solution

A braking control arrangement that integrates with ABS and ESC to detect slippery roads and shift the vehicle into reverse mode during braking, and upon detecting a turn or unwanted steering, shifts back to forward mode using speed measurement data.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If anti-lock braking system (ABS) is used to prevent wheel locking and maintain steering control, then steering control is improved, but braking distance increases on slippery surfaces

Engineering Contradiction:

Improvesteering controlVSAvoidbraking distance

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The patent applies reverse gear engagement during emergency braking on slippery surfaces, inverting the normal forward motion to create a counteracting force that reduces braking distance while maintaining steering control through the ABS system

Inventive Principle:

Principle #13The other way round (Inversion)

2Stability of the object's composition

If electronic stability control (ESC) is used to detect and reduce skidding, then vehicle stability is improved, but braking distance increases on loose gravel surfaces

Engineering Contradiction:

Improvevehicle stabilityVSAvoidbraking distance

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The system engages reverse gear during emergency braking on loose gravel, creating a counteracting force that shortens braking distance while the ESC system maintains vehicle stability by preventing skidding through selective wheel braking

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of operation

If normal gear shifting behavior is maintained during braking, then gear operation simplicity is preserved, but braking distance and vehicle control deteriorate on slippery roads

Engineering Contradiction:

Improvegear operation simplicityVSAvoidbraking distance

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The system automatically engages reverse gear before the driver can manually shift, preparing the vehicle in advance for optimal braking performance on slippery surfaces. The control unit detects slippery conditions and pre-engages reverse gear to minimize braking distance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The braking control system automatically manages gear selection by engaging reverse gear during emergency braking on slippery surfaces without requiring driver intervention. The system monitors wheel speed, brake pressure, and road conditions to autonomously determine when reverse gear engagement is beneficial

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP3990323B1A braking control arrangement for a braking system of a vehicle

Publication Date: 2025.08.20 AUVINEN JUKKA

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AI summary

A braking control arrangement according to the invention is for a braking system of a vehicle (1B). The braking system comprises an anti-lock braking system, ABS, and an electronic stability control, ESC. The braking control arrangement comprises a module (40) that is arranged to operate with the anti-lock braking system and the electric stability control. The arrangement is also arranged to drive a gear arrangement (25A) of the vehicle in such a way that when braking the vehicle, the anti-lock braking system works, and a slippery road is detected, the gear arrangement (25A) of the vehicle (1B) is driven to shift a reverse gear.