DE2704178A1 - Separation distance measuring device for vehicles - measures time difference between received acoustic and electromagnetic pulses simultaneously emitted by preceding vehicle - Google Patents
Separation distance measuring device for vehicles - measures time difference between received acoustic and electromagnetic pulses simultaneously emitted by preceding vehicleInfo
- Publication number
- DE2704178A1 DE2704178A1 DE19772704178 DE2704178A DE2704178A1 DE 2704178 A1 DE2704178 A1 DE 2704178A1 DE 19772704178 DE19772704178 DE 19772704178 DE 2704178 A DE2704178 A DE 2704178A DE 2704178 A1 DE2704178 A1 DE 2704178A1
- Authority
- DE
- Germany
- Prior art keywords
- vehicle
- distance
- vehicles
- signals
- time difference
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/16—Systems for determining distance or velocity not using reflection or reradiation using difference in transit time between electrical and acoustic signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
STAND DER TECHNIKSTATE OF THE ART
Als Ursache für Verkehrsunfälle nehmen die Auffahrunfälle den ersten Platz ein. Die Gründe sind zwar verschieden, fast immer ist es der Mensch der versagt. Ungünstige Witterungsverhälnisse erschweren oft die rechtzeitige Reaktion.Rear-end collisions take the first one as the cause of traffic accidents Place. The reasons are different, but it is almost always the person who fails. Unfavorable weather conditions often make it difficult to react in good time.
Ziel einer Erfindung zugunsten der Verkehrssicherheit kann ein Gerät sein, das die Aufmerksamkeit des Fahrers durch ständiges Messen und entsprechender Anzeige bei Unterschreiten des Mindestabstandes zum Vordermann unterstützt.The aim of an invention for the benefit of traffic safety can be a device be that the driver's attention through constant measuring and appropriate Supported display when the minimum distance to the vehicle in front is not reached.
Diese Aufgabe kann durch ein Gerät gelöst werden, das durch Messen der Laufzeit von ausgesandten und vom vorausfahrenden Fahrzeug reflektierten Wellen die Entfernung mißt (Reflektionsmethode). Als Medien stehen dafür elektromagnetische Wellen (Radar) oder akustische (Ultraschall) zur Verfügung. Am nachfolgenden Fahrzeug ist demnach eine Sendeeinrichtung montiert, die intervallartig Impulse aussendet. Diese Impulse werden vom vorausfahrenden Fahrzeug reflektiert und von einer entsprechenden Empfangseinrichtung durch Messung der Laufzeit in der Entfernung proportionale Signale umgewandelt. Der ermittelte Wert für den Abstand zum Vordermann wird mit der eigenen Geschwindigkeit verglichen. Ist der Abstand geringer als der für die derzeitige Geschindigkeit ausreichende Sicherheitsabstand ertönt ein Signal.This task can be solved by a device that by measuring the transit time of transmitted waves and waves reflected from the vehicle in front measures the distance (reflection method). The media are electromagnetic Waves (radar) or acoustic (ultrasound) are available. On the following vehicle a transmitter is installed that sends out pulses at intervals. These impulses are reflected by the vehicle in front and a corresponding one Receiving device by measuring the transit time in the distance proportional signals converted. The value determined for the distance to the vehicle in front is your own Speed compared. The distance is less than that for the current one A signal sounds for a sufficient safety distance.
Versuche haben ergeben, daß die Verwendung von Radarwellen, neben dem Kostenfaktor, einige technische Schwierigkeiten mit sich bringt. An Ausfahrten oder in Kurven kann durch Reflexion der ausgesandten Wellen durch seitliche unbewegliche Objekte oder entgegenkommende Fahrzeuge eine Fehlanzeige hervorgerufen werden, die die Aufmerksamkeit des Fahrers unnötig strapaziert und die Anlage unglaubwürdig macht. Damit aber ist die Wirksamkeit des Gerätes in Frage gestellt.Tests have shown that the use of radar waves, besides the cost factor, brings with it some technical difficulties. At exits or in curves can be immovable by reflection of the emitted waves by lateral Objects or oncoming vehicles will cause a nil the driver's attention is unnecessarily strained and the system is untrustworthy power. But this calls into question the effectiveness of the device.
Ähnlich verhält es sich bei der Verwendung von Ultraschallwellen. Hier kommt hinzu, daß durch Seitenwind eine weitere Fehlerquelle entsteht.The situation is similar when using ultrasonic waves. In addition, there is another source of error caused by cross winds.
Bei größerem Abstand zum Vordermann dauert außerdem die Rückkehr der reflektierten Welle zu lange, sofern sie nicht überhaupt in der Leistung so weit geschächt oder beeinflußt ist, um eine Anzeige auszuschließen.If the distance to the vehicle in front is greater, it also takes the return reflected wave too long unless it is at all in performance so far is weakened or influenced to exclude an indication.
Die beiden genannten Methoden hätten bei ih-er Serwirklichung einen Vorteil gemeinsam: sie sind nicht von Einrichtungen an anderen Fahrzeugen abhängig, d.h , mit dem Einbau eines solchen Gerätes wäre die Warbririchtung komplett.The two methods mentioned would have one if they were to be realized The common advantage: they are not dependent on equipment on other vehicles, i.e. with the installation of such a device the warbring direction would be complete.
Die genannter Nachteile jedoch stellen eine xJerwertberkent in der Praxis sehr in frage insbesondere dann, wenn später first jedes Fahrzeug ein solches ert besitzt. Die gegenseitige Beelnrsissung der eingeschalteten Geräte, insbesondere durch entgegenkommend Feb leuge ware enorm.The disadvantages mentioned, however, represent a significant advantage in the Practice very much in question, especially if later every vehicle has one ert owns. The mutual concern of the switched on devices, in particular by being accommodating Feb leuge would be enormous.
Die erfindunqsgernäße Anordnung bietet eine LbsLfL. dc genarnrer Nachteile völlig ausschliefit.The arrangement according to the invention offers an LbsLfL. dc specific disadvantages completely excluded.
AUFBAU Die erfindungsgemäße Warnvorrichtung besteht aus zwei Hauptteilen: dem Sendeteil, das sich hinten am Fahrzeug des vorausfahrenden Fahrzeuges befindet, und dem Empfangsteil, der vorn am nachfolgenden Fahrzeug montiert ist.STRUCTURE The warning device according to the invention consists of two main parts: the transmitter that is located at the rear of the vehicle in front of the vehicle, and the receiving part, which is mounted on the front of the following vehicle.
Das Sendeteil des Vordermannes sendet ein elektromagnetisches Signal über eine Ferritantenne und ein akustisches Signel über einen Ultraschaliwandler aus, die beide mit der gleichen einstellbaren Niederfrequenz moduliert sind.The transmitter part of the vehicle in front sends an electromagnetic signal via a ferrite antenna and an acoustic signal via an ultrasonic transducer which are both modulated with the same adjustable low frequency.
Der Empfangsteil wertet die ankommenden beiden Signale aus. Durch die Entfernung vom Sender zum Empfänger heben beide eine unterschiedliche Ankubftszeit. Die Differenz der Laufzeit bildet ein Maß für den zurückgelegten Weg, den Abstand.The receiving part evaluates the two incoming signals. By the distance from the transmitter to the receiver both have a different arrival time. The difference in transit time is a measure of the distance covered, the distance.
Uber eine Induktionsspule werden die Impulse des kfz-eigenen Tachos aufgenommen und in der Geschwindigkeit proportionales Signal umgewandelt ebenfalls dem Empfangsteil zugeführt. Hier wird es mit dem elektrischen Wert für den ermittelten Abstand verglichen. Das Ergebnis ist je nach Ausführung des Gerätes ein akustisches Signal bei Unterschreiten des Sicherheitsabstandes oder der entsprechende Steuerbefehl an die Beschleunigungs- bzw Brensorgane des Fahrzeuges.The impulses of the vehicle's own speedometer are transmitted via an induction coil recorded and converted in the speed proportional signal also fed to the receiving part. Here it is determined with the electrical value for the Distance compared. Depending on the version of the device, the result is an acoustic one Signal when the safety distance is not reached or the corresponding control command to the vehicle's acceleration or combustion system.
Die Nachteile gegenüber der Reflexionsmethode entfallen völlig. Die Signale des Vordermannes werden auch In Kurven gleichgut empfangen.The disadvantages compared to the reflection method are completely eliminated. the Signals from the vehicle in front are also received equally well in bends.
Entgegenkommende Fahrzeuge können die Ubertragung nicht beeinflussen, weil sich der Sender jeweils am Heck eines Fahzeuges befindet, während am Vorderteil der Empfänger montiert ist. Somit stehen sich beim Entgegenkommen jeweils zwei Sender gegenüber, die sich gegenseitig nicht beeinflussen können.Oncoming vehicles cannot influence the transmission, because the transmitter is located at the rear of a vehicle, while at the front the receiver is mounted. This means that when you approach each other, two transmitters stand at each other opposite that cannot influence each other.
Der Nachteil der Abhängigkeit vom Vorhandensein eines sendenden Vordermannes kann durch geeignete kaufmännische Methoden wieder wettgemacht werden, in dem nämlich interessierte Organisationen ( z.B. Automobilclubs) die Publikation übernehmen und evtl. Versicherungsgesellschaften einen Prämiennachlaß gewähren, der die Anschaffung eines erfindungsgemäßen Gerätes amortisiert.The disadvantage of the dependence on the presence of a sending person in front can be made up for by suitable commercial methods, namely interested organizations (e.g. automobile clubs) take over the publication and possibly grant insurance companies a premium discount that the purchase a device according to the invention amortized.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772704178 DE2704178A1 (en) | 1977-02-02 | 1977-02-02 | Separation distance measuring device for vehicles - measures time difference between received acoustic and electromagnetic pulses simultaneously emitted by preceding vehicle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19772704178 DE2704178A1 (en) | 1977-02-02 | 1977-02-02 | Separation distance measuring device for vehicles - measures time difference between received acoustic and electromagnetic pulses simultaneously emitted by preceding vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2704178A1 true DE2704178A1 (en) | 1978-08-03 |
Family
ID=6000122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19772704178 Pending DE2704178A1 (en) | 1977-02-02 | 1977-02-02 | Separation distance measuring device for vehicles - measures time difference between received acoustic and electromagnetic pulses simultaneously emitted by preceding vehicle |
Country Status (1)
Country | Link |
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DE (1) | DE2704178A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3806849A1 (en) * | 1988-03-03 | 1989-09-14 | Bosch Gmbh Robert | Distance measurement system for non-touching (contact-free) distance measurement |
FR2631454A1 (en) * | 1988-04-13 | 1989-11-17 | Neiman Sa | Measurement of separation of moving vehicles - using transmitted IR test beam and ultrasound returned response signal |
DE3941402A1 (en) * | 1989-12-15 | 1991-06-20 | Asea Brown Boveri | Collision warning system for vehicle - evaluates transmitted HF signal modulated with information representative of vehicle speed and acceleration |
FR2884626A1 (en) * | 2005-04-19 | 2006-10-20 | Daniel Henri Lucien Jos Martin | Movable vehicles` distance adjusting device for e.g. constantly maintaining distance, has vehicle with ultrasonic receiver to receive signal that is variable with distance, and adapting its path for constantly maintaining signal |
EP3514012A1 (en) | 2018-01-22 | 2019-07-24 | odelo GmbH | Warning method when a safety distance between successive motor vehicles is no longer met and vehicle lamp for carrying out the method |
EP3531393A1 (en) | 2018-02-27 | 2019-08-28 | odelo GmbH | Method and vehicle lamp for recording when the distance between successive vehicles falls below a safety distance |
-
1977
- 1977-02-02 DE DE19772704178 patent/DE2704178A1/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3806849A1 (en) * | 1988-03-03 | 1989-09-14 | Bosch Gmbh Robert | Distance measurement system for non-touching (contact-free) distance measurement |
FR2631454A1 (en) * | 1988-04-13 | 1989-11-17 | Neiman Sa | Measurement of separation of moving vehicles - using transmitted IR test beam and ultrasound returned response signal |
DE3941402A1 (en) * | 1989-12-15 | 1991-06-20 | Asea Brown Boveri | Collision warning system for vehicle - evaluates transmitted HF signal modulated with information representative of vehicle speed and acceleration |
FR2884626A1 (en) * | 2005-04-19 | 2006-10-20 | Daniel Henri Lucien Jos Martin | Movable vehicles` distance adjusting device for e.g. constantly maintaining distance, has vehicle with ultrasonic receiver to receive signal that is variable with distance, and adapting its path for constantly maintaining signal |
EP3514012A1 (en) | 2018-01-22 | 2019-07-24 | odelo GmbH | Warning method when a safety distance between successive motor vehicles is no longer met and vehicle lamp for carrying out the method |
EP3531393A1 (en) | 2018-02-27 | 2019-08-28 | odelo GmbH | Method and vehicle lamp for recording when the distance between successive vehicles falls below a safety distance |
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Legal Events
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OHJ | Non-payment of the annual fee |