WO2001053133A1 - Dispositif de feux stop ameliore - Google Patents

Dispositif de feux stop ameliore Download PDF

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Publication number
WO2001053133A1
WO2001053133A1 PCT/SE2001/000107 SE0100107W WO0153133A1 WO 2001053133 A1 WO2001053133 A1 WO 2001053133A1 SE 0100107 W SE0100107 W SE 0100107W WO 0153133 A1 WO0153133 A1 WO 0153133A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
vehicle
light
lights
arrangement according
Prior art date
Application number
PCT/SE2001/000107
Other languages
English (en)
Inventor
Fred Goldberg
Nils Gawell
Original Assignee
Autoliv Development Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Autoliv Development Ab filed Critical Autoliv Development Ab
Publication of WO2001053133A1 publication Critical patent/WO2001053133A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
    • B60Q1/441—Electric switches operable by the driver's pedals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
    • B60Q1/444—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal with indication of the braking strength or speed changes, e.g. by changing shape or intensity of the indication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
    • B60Q1/448—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal specially adapted for vehicles with ABS

Definitions

  • THE PRESENT INVENTION relates to a brake-light arrangement for use in a motor vehicle.
  • a vehicle covers 27.7 metres every second. In other words, a vehicle covers a distance equivalent to the length of five typical motor cars in a single second. If a driver starts braking 0.2 seconds sooner, the vehicle will stop in a distance which is shorter by over 5 metres, and thus in some cases a collision may be avoided.
  • the present invention therefore seeks to provide an improved brake-light arrangement which, in use, may very rapidly alert the driver of a vehicle behind the vehicle provided with the brake-light arrangement to the fact that the vehicle is braking.
  • a brake-light arrangement provided in a motor vehicle, the brake-light arrangement incorporating a control system, the control system receiving input signals from a first unit adapted to respond to a predetermined movement of a foot of the driver of the vehicle relative to the brake pedal, a second unit providing a signal related to the instantaneous deceleration of the vehicle, the control system being adapted to control rapidly illuminating brake-lights to be illuminated when the predetermined movement of the foot has been sensed, the brake-lights being controlled to flash with a first predeteimined frequency when a deceleration exists which is less than a predeteimined threshold, and to flash with a second higher frequency when a deceleration exists which is equal to or greater than the threshold.
  • brake-lights which become illuminated almost instantaneously when provided with electrical current, in contrast to conventional brake-lights, such as incandescent bulbs, which take, relatively, a long time to become fully illuminated.
  • brake-lights are light-emitting diode brake-lights, such as so-called laser diode lights.
  • gas-discharge brake-lights may be used.
  • the first frequency is approximately 2 Hz, and conveniently the second frequency is approximately 5 Hz.
  • a timer is provided so that whenever the lights are illuminated with the second frequency of flashing, they remain illuminated with that second frequency of flashing for a predetermined period of time.
  • the period of time is approximately three seconds.
  • the deceleration sensor is adapted to provide an output signal which is corrected in dependence upon the inclination of the vehicle.
  • a deceleration sensor is provided, an output from the deceleration sensor being provided to a delay device, the output of the delay device being subtracted from the instantaneous output of the deceleration sensor to provide said output signal corrected in dependence upon the inclination of the vehicle.
  • the means adapted to sense the predetermined movement of the foot comprise means generating a beam of light directed towards a predetermined region relative to the brake pedal, and means to sense light reflected from said predetermined region relative to the brake pedal.
  • the light is infra-red light.
  • the light is directed, by means of a lens collimator, to form a "pencil" beam directed towards said region.
  • a light detector is provided associated with a lens collimator arrangement so that the detector can receive light from the region.
  • the light is modulated by a modulator, and an output signal from the detector is compared with an output signal from the modulator by a comparator.
  • control system receives input signals from an ABS unit in the vehicle, the control system being adapted to control the rapidly illuminating brake-lights to flash with said second, higher, frequency when the ABS unit senses a locked wheel during braking.
  • control system receives a signal from a unit responsive to pressure applied to the brake pedal, the control system being adapted to control the brake-lights to be illuminated whenever pressure is applied to the brake pedal.
  • control system receives an input from a third unit which provides a signal indicating whether the vehicle is stationary or moving, and the brake lights are also controlled to be illuminated with a steady illumination when the vehicle is stationary.
  • FIGURE 1 is a diagrammatic side view of a brake-pedal operation sensor unit
  • FIGURE 2 is a front view of the sensor unit of Figure 1
  • FIGURE 3 is a block diagram of a sensor unit of Figures 1 and 2,
  • FIGURE 4 is a block diagram of a brake-light arrangement
  • FIGURE 5 is a further block diagram in the form of a flow chart.
  • a sensor unit which senses movement of the right foot of the driver of the motor vehicle towards the brake pedal.
  • a sequence of events is initiated. Initially a very fast illuminating brake-light is caused to be illuminated, flashing at a first frequency. As soon as a deceleration of more than a predetermined threshold is sensed, the flashing frequency of the brake- light is increased to a second, higher, predetermined frequency. Whenever the brake-light flashes at the second predetermined frequency, it will maintain flashing at that frequency for at least a predeteirnined period of time, even if the deceleration rate subsequently decreases. As soon as the vehicle is stationary, the rear light is illuminated with no flashing.
  • a sensor unit is illustrated which is adapted to sense movement of the right foot of the driver of the motor vehicle towards the brake pedal.
  • the dashboard 1 of the motor vehicle is illustrated together with the steering wheel 2 and the brake pedal 3.
  • the brake pedal 3 is located centrally, in this embodiment, between an accelerator pedal 4 and a clutch pedal 5.
  • the housing 6 contains the components of an infra-red sensor arrangement which will be described in conjunction with Figure 3.
  • the infra-red sensor incorporates an infra-red lamp 10.
  • the infra-red lamp 10 is associated with a lens/collimator arrangement 1 1 adapted to generate a "pencil" beam of light 12. Such a beam is a non-divergent beam of relative small dimension.
  • the pencil beam 12 is directed towards the brake pedal 3.
  • the sensor arrangement incorporates a second lens collimator arrangement 13 which is adapted to direct light on to an infra-red detector 14.
  • the lens/collimator 13 is such that only light present within a relatively narrow "pencil" beam 15 will be focused on to the infra-red detector.
  • the arrangement of the lens/collimator 1 1 and the lens/collimator 13 is such that the "pencil" beam 12 and the "pencil” beam 15 intersect at a predetermined region.
  • the region where the beams intersect namely the region 16, as shown in Figures 2 and 3, is located approximately 50-60 millimetres away from the brake pedal 3, as measured relative to the plate of the brake pedal, and approximately 10 millimetres from one side edge of the brake pedal.
  • the region is located approximately 150 millimetres beneath the housing 6.
  • the infra-red lamp 10 is modulated by a modulator 17.
  • the modulator may be a frequency modulator, or may be a pulse code modulator. It is to be appreciated that if the infra-red lamp is modulated, any reflected light detected by the infra-red detector which originated with the infra-red lamp will be modulated light.
  • the output from the infra-red detector 14 is passed to a comparator 18 which also receives a direct signal from the modulator 17.
  • the comparator 18 compares the output of the detector 14 with the output of the modulator 17.
  • the output of the comparator 18 is passed to a discriminator 19.
  • the discriminator 19 will be able to determine if the infra-red detector 14 has detected light that originated from the infra-red lamp 10. If the discriminator determines that the infra-red detector has detected light of this type, a situation exists in which the brake pedal is about to be operated, since the foot of the driver has been moved to a position above the brake pedal.
  • the optical sensor arrangement that has been described above is shown in Figure 4 as the brake pedal optical sensor 20.
  • the output of the brake pedal optical sensor 20 is supplied as one input to a contiol system 21.
  • a further input to the control system 21 comprises the output of a brake pedal pressure sensor unit 22.
  • the brake pedal pressure sensor unit may comprise a pad of pressure-sensitive material mounted on the brake pedal, thus providing an output signal as soon as the brake pedal is actually pressed.
  • the brake pedal pressure sensor unit may be the pressure switch that is conventionally provided adapted to respond to an increase in pressure in the brake fluid within the brake system, caused by depression of the brake pedal, to operate the brake-lights. In any event, the brake pedal pressure sensor will provide an output to the contiol arrangement 21 whenever pressure is applied to the brake pedal.
  • a further input to the control arrangement 21 is an input from the speedometer 23 of the vehicle.
  • the speedometer acts as a unit which provides a signal indicating whether the vehicle is stationary or moving. This is provided so that the control arrangement can determine whether the vehicle is actually moving, or whether the vehicle is actually stationary.
  • Another input to the control arrangement 21 is the output of a deceleration sensor unit 24 which senses the instantaneous deceleration of the vehicle.
  • a typical deceleration sensor may incorporate a swinging pendulum, or some other inertia member.
  • a problem with such deceleration sensors is that erroneous signal can be provided if the deceleration sensor is present in a vehicle which is travelling up-hill or down-hill. Thus there is an error which relates to the instantaneous inclination of the vehicle. Consequently, in the particularly described embodiment of the invention, the deceleration sensor unit 24 incorporates a deceleration sensor 25, an output of which is provided to a delay line 26.
  • the delay line may have a delay of, typically, 1 second.
  • the output from the delay line 26 is subtiacted by a subtracter 27 from a further output of the deceleration sensor 25.
  • the output from the subtractor constitutes the output of the deceleration sensor unit 24.
  • the deceleration sensor 25 will provide an output equivalent to a predeteirnined deceleration. However, should the vehicle suddenly brake, the sensed deceleration will change, as a consequence of the braking.
  • the value of the output one second By subtracting, from the instantaneous output of the deceleration sensor 25, the value of the output one second previously, it is possible to generate a signal which is very closely related to the actual deceleration of the vehicle.
  • ABS Antilock Braking System
  • the contiol arrangement 21 is adapted to provide signals to contiol a flasher timer circuit 29.
  • the flasher/timer circuit is adapted to perform three functions.
  • the first function is to provide an output signal directed to very fast acting red brake-lights, such as light-emitting diode lights 30, or so-called laser diodes mounted on the rear of the vehicle, the output signal will cause the light-emitting diode lights 30 to flash at a first predetermined flash rate, such as a flash rate of 2 Hz.
  • the second function of the flasher/timer is to cause the light-emitting diode lights 30 to flash at a second predetermined flash rate, which is greater than the first flash rate, such as a flash rate of 5 Hz.
  • the flasher/timer circuit 29 is arranged so that whenever the light-emitting diode lights 30 are caused to flash at the second flash rate, they always flash at that rate for a period of time of at least three seconds.
  • the third function of the flasher/timer circuit 29 is to cause the light-emitting diode lights 30 to be illuminated with a steady illumination, that is to say with no flashing at all.
  • Light-emitting diode lights 30 are used since such lights may be fully illuminated in a period of time which is at least 0.2 seconds shorter than the time taken to illuminate a typical incandescent bulb as used in a vehicle brake light.
  • Other fast acting light sources may be used, such as certain types of discharge lamp where the lamp may be fully illuminated in a very brief period of time.
  • the described brake-light arrangement follows a predetermined sequence of operations. If the brake pedal optical sensor 20 senses the brakes are about to be operated or, if for some reason the brake pedal optical sensor does not provide an output signal, and a signal is generated by the brake pedal pressure sensor, then a sequence of events is followed which leads to illumination of the light-emitting diode lights 30.
  • the control arrangement 21 determines if the vehicle is moving. If the vehicle is not moving, the brake- lights are illuminated with no flashing. If the vehicle is moving, the control arrangement determines the current deceleration rate of the vehicle. If the deceleration rate is less than 0.3 g, then the light-emitting diode lights 30 are caused to flash with a flash rate of 2 Hz. Thus, if a driver simply moves his or her foot to "hover" over the brake pedal, the arrangement will sense that the brake pedal is about to be operated, will determine that the vehicle is moving and will determine that there is no present deceleration, and the brake-lights will be flashed at a rate of 2 Hz.
  • the contiol airangement 21 may effectively turn off the brake light if the brake pedal is not pressed within a predeteimined time of, for example, one second. If the driver is moving his or her foot rapidly towards the brake pedal to effect an "emergency" stop, the brake-lights will be illuminated as soon as the foot is detected by the optical sensor 20. In an alternate situation in which a person has gently applied the brakes and is braking with a deceleration of, say, 0.2 g, the brake-lights will also flash at 2 Hz. Thus, the driver of a following vehicle will be alerted to the fact that the vehicle in front is about to brake, or is braking gently, just as soon as is practicable.
  • the control airangement 21 will determine if the ABS unit has been actuated. If it has, because the vehicle is braking hard, the lights 30 will be caused to flash at a frequency of 5 Hz.
  • the lights will be caused to flash at a frequency of 5 Hz. If ever the lights are caused to flash at a frequency of 5 Hz, they flash at that frequency for at least three seconds.
  • a deceleration rate of 0.3 g or more is sensed, or if the ABS is activated, the light- emitting diode lights will flash at a relatively high rate for a period of time sufficient to ensure that the driver of the vehicle behind will observe the high rate of flashing, and will thus appreciate that the vehicle in front is braking severely.
  • the brake-light arrangement When the vehicle comes to a stop, the brake-light arrangement will deteimine that the vehicle has stopped moving and the brake-lights will then be illuminated with no flashing. It is to be understood that it is not essential for the optical sensor 20 to sense the foot of the driver in the region 16 adjacent the brake pedal for the brake lights to be illuminated.
  • the control system 21 will always illuminate the brake lights when a pressure is applied to the brake pedal which is sensed by the brake pedal pressure sensor 22.
  • the described system will enable the driver of the vehicle behind to appreciate, at the earliest possible moment, the nature of the braking being effected by the vehicle in front.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

L'invention concerne un dispositif de feux stop d'un véhicule motorisé, composé d'un système de commande (21) recevant des entrées provenant d'un capteur optique (20) détectant un mouvement prédéterminé d'un pied du conducteur du véhicule par rapport à la pédale de frein, d'un compteur de vitesse (23) produisant un signal indiquant si le véhicule est à l'arrêt ou en mouvement, et d'une unité de décélération (24) produisant un signal dépendant de la décélération instantanée du véhicule. Le système de commande (21) commande un clignotant/temporisateur (29) commandant à son tour des feux stop à diodes électroluminescentes. Les lumières clignotent à une première fréquence prédéterminée dans le cas d'une décélération faible, et clignotent à une fréquence supérieure dans le cas d'une décélération importante.
PCT/SE2001/000107 2000-01-20 2001-01-19 Dispositif de feux stop ameliore WO2001053133A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0001313A GB2358460A (en) 2000-01-20 2000-01-20 Motor vehicle brake-light arrangement
GB0001313.6 2000-01-20

Publications (1)

Publication Number Publication Date
WO2001053133A1 true WO2001053133A1 (fr) 2001-07-26

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ID=9884037

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/000107 WO2001053133A1 (fr) 2000-01-20 2001-01-19 Dispositif de feux stop ameliore

Country Status (2)

Country Link
GB (1) GB2358460A (fr)
WO (1) WO2001053133A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6717376B2 (en) 1997-08-26 2004-04-06 Color Kinetics, Incorporated Automotive information systems
WO2004035350A2 (fr) * 2002-10-21 2004-04-29 Jacek Pilat Procede de signalisation de freinage dans des vehicules a moteur et unite de signalisation de freinage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401493B (en) * 2003-05-07 2005-02-16 Derek Desmond Disley Vehicle safety equipment
ES2353709B1 (es) * 2009-07-29 2012-01-17 Jose Francos Francos Luz de freno mejorada.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528056A (en) * 1966-06-10 1970-09-08 John Voevodsky Intervehicular communications system including deceleration warning system
US4357594A (en) * 1980-06-02 1982-11-02 Traffic Safety Devices Company Vehicular hazard warning system
EP0611679A2 (fr) * 1993-02-19 1994-08-24 Max Dipl.-Ing. Gerhaher Dispositif avertisseur en cas de décélération
FR2758775A1 (fr) * 1997-01-24 1998-07-31 Francois Pierre Desgigot Systeme de declenchement anticipe de l'allumage des feux-stop
US5969602A (en) * 1997-11-12 1999-10-19 Marks; Lakeith A. Early warning braking system
GB2348325A (en) * 1999-03-25 2000-09-27 Kevin Doherty Vehicle deceleration indicating device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3813542A (en) * 1972-09-07 1974-05-28 J Spadafora Brake signal device for a vehicle
DE3732273C1 (en) * 1987-09-25 1988-07-14 Wolfgang Meinhard Device for permitting the brake lights of a vehicle to light up early
DE19501275A1 (de) * 1995-01-18 1996-07-25 Beizerov Boris Warneinrichtung an Kraftfahrzeugen
ATE225720T1 (de) * 1996-07-29 2002-10-15 Liberty Gardens Ltd Signaleinrichtung für kraftfahrzeuge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3528056A (en) * 1966-06-10 1970-09-08 John Voevodsky Intervehicular communications system including deceleration warning system
US4357594A (en) * 1980-06-02 1982-11-02 Traffic Safety Devices Company Vehicular hazard warning system
EP0611679A2 (fr) * 1993-02-19 1994-08-24 Max Dipl.-Ing. Gerhaher Dispositif avertisseur en cas de décélération
FR2758775A1 (fr) * 1997-01-24 1998-07-31 Francois Pierre Desgigot Systeme de declenchement anticipe de l'allumage des feux-stop
US5969602A (en) * 1997-11-12 1999-10-19 Marks; Lakeith A. Early warning braking system
GB2348325A (en) * 1999-03-25 2000-09-27 Kevin Doherty Vehicle deceleration indicating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6717376B2 (en) 1997-08-26 2004-04-06 Color Kinetics, Incorporated Automotive information systems
WO2004035350A2 (fr) * 2002-10-21 2004-04-29 Jacek Pilat Procede de signalisation de freinage dans des vehicules a moteur et unite de signalisation de freinage
WO2004035350A3 (fr) * 2002-10-21 2005-01-13 Jacek Pilat Procede de signalisation de freinage dans des vehicules a moteur et unite de signalisation de freinage

Also Published As

Publication number Publication date
GB2358460A (en) 2001-07-25
GB0001313D0 (en) 2000-03-08

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