Preliminary Braking Control for Short-Gap Intersection Deceleration

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Solution Overview

Problem

Existing vehicle braking systems may cause rear-end collisions due to high responsiveness, leading to sudden braking when approaching intersections, especially when the inter-vehicle distance is short.

Innovation Solution

A preliminary braking device and method that detects surrounding conditions using cameras, radars, and GPS to apply gentle deceleration before reaching a deceleration area, such as an intersection, based on time-to-collision calculations and deceleration possibilities, to prevent rear-end collisions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the brake system applies strong braking force to enable the vehicle to stop before the intersection, then the vehicle can safely enter the deceleration area, but the following vehicle may collide with the host vehicle due to sudden deceleration

Engineering Contradiction:

Improvesafety of entering deceleration areaVSAvoidrear-end collision risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary braking by applying a small amount of brake pressure in advance to place brake pads on brake disks, so that when the driver applies the brake, the brake line can react quickly without causing sudden deceleration that would endanger following vehicles

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts brake pressure based on detected conditions, applying preliminary braking only when necessary (when inter-vehicle distance is short and vehicle is approaching deceleration area), and adjusts the amount of brake pressure to achieve optimal balance between stopping capability and following vehicle safety

Inventive Principle:

Principle #15Dynamics

2Reliability

If the vehicle applies strong braking to stop before the intersection, then the vehicle can comply with traffic regulations, but the high responsiveness of the brake line may cause sudden braking that endangers following vehicles

Engineering Contradiction:

Improvecompliance with traffic regulationsVSAvoidsudden braking

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the parameter of brake pressure by applying a small amount of brake pressure (preliminary braking) instead of full brake pressure, transforming the braking characteristic from sudden to gradual while maintaining the ability to stop before the intersection

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4446180B1Preliminary braking device and preliminary braking method

Publication Date: 2026.05.06 SUZUKI MOTOR CORP

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AI summary

A preliminary braking device 10 includes a following vehicle detection unit 12 configured to detect vehicle speed of a following vehicle 300 following a vehicle 100 and an inter-vehicle distance D to the following vehicle 300, a deceleration area detection unit 14 configured to detect a deceleration area 30 in a traveling lane 31 ahead of the vehicle 100, and a braking activation unit 17 configured to, when the inter-vehicle distance D to the following vehicle 300 is smaller than a predetermined value when the vehicle 100 passes through a position before the deceleration area 30 by a predetermined distance, cause a brake system to activate preliminary braking for generating deceleration smaller than or equal to a predetermined value.