Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Proportional Automobile Brake Light

IP.com Disclosure Number: IPCOM000010525D
Original Publication Date: 2002-Dec-11
Included in the Prior Art Database: 2002-Dec-11
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Abstract

Currently the only indication that a vehicle is stopping is the binary signal of brake-lights. A following driver must discern the rate at which the vehicle is decelerating based on how quickly the gap between the vehicles narrows. This delay in driver reaction can be crucial when the leading vehicle is braking hard. The solution is the addition of a brake signal that varies with rate of deceleration of the vehicle. This article describes such a brake-light.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 1

Proportional Automobile Brake Light

Currently the only indication that a vehicle is stopping is the binary signal of brake-lights. A following driver must discern the rate at which the vehicle is decelerating based on how quickly the gap between the vehicles narrows. This delay in driver reaction can be crucial when the leading vehicle is braking hard. The solution is the addition of a brake signal that varies with rate of deceleration of the vehicle. This article describes such a brake-light.

     A proportional brake-light must indicate the rate at which the vehicle is decelerating. This can be determined directly by measuring the speed of the vehicle, or indirectly by determining how hard the brake is being applied. The rate of deceleration could be measured directly from speed sensors, either from anti-lock brake wheel sensors, or the speedometer. Indirect methods such as amount of deflection of the brake pedal, or braking force could also be used, but would have problems with accuracy. Given the increasingly common availability of anti-lock brakes, the remainder of the article will assume wheel-speed sensors will be used to calculate deceleration.

     An array of indicator lamps, mounted on the rear of the vehicle, would be used to indicate the rate of deceleration. Many vehicles are equipped with this style of indicator as a third brake-light, however, all lamps are lit together. For a proportional brake-light, a micro-controller based circuit uses information from...