DE102014000527A1 - Method for determining coefficient of friction between vehicle wheel of vehicle and road surface, involves determining friction coefficient based on ratio of total acceleration of vehicle for acceleration due to gravity - Google Patents
Method for determining coefficient of friction between vehicle wheel of vehicle and road surface, involves determining friction coefficient based on ratio of total acceleration of vehicle for acceleration due to gravity Download PDFInfo
- Publication number
- DE102014000527A1 DE102014000527A1 DE201410000527 DE102014000527A DE102014000527A1 DE 102014000527 A1 DE102014000527 A1 DE 102014000527A1 DE 201410000527 DE201410000527 DE 201410000527 DE 102014000527 A DE102014000527 A DE 102014000527A DE 102014000527 A1 DE102014000527 A1 DE 102014000527A1
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- Germany
- Prior art keywords
- vehicle
- acceleration
- friction
- road surface
- coefficient
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
- B60W40/02—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to ambient conditions
- B60W40/06—Road conditions
- B60W40/068—Road friction coefficient
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2556/00—Input parameters relating to data
- B60W2556/45—External transmission of data to or from the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2556/00—Input parameters relating to data
- B60W2556/45—External transmission of data to or from the vehicle
- B60W2556/65—Data transmitted between vehicles
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mathematical Physics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Ermittlung eines Reibwertes zwischen zumindest einem Fahrzeugrad eines Fahrzeuges und einer Fahrbahnoberfläche.The invention relates to a method for determining a coefficient of friction between at least one vehicle wheel of a vehicle and a road surface.
Aus der
Der Erfindung liegt die Aufgabe zugrunde, ein gegenüber dem Stand der Technik verbessertes Verfahren zur Ermittlung eines Reibwertes zwischen zumindest einem Fahrzeugrad eines Fahrzeuges und einer Fahrbahnoberfläche anzugeben.The invention has for its object to provide a comparison with the prior art improved method for determining a coefficient of friction between at least one vehicle wheel of a vehicle and a road surface.
Die Aufgabe wird erfindungsgemäß durch die in Anspruch 1 angegebenen Merkmale gelöst.The object is achieved by the features specified in claim 1.
Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.
Ein Verfahren zur Ermittlung eines Reibwertes zwischen zumindest einem Fahrzeugrad eines Fahrzeuges und einer Fahrbahnoberfläche sieht erfindungsgemäß vor, dass während eines automatischen Eingriffes einer Fahrdynamikregelung und/oder eines aktiven Eingriffs eines Antriebs- oder Bremsschlupfregelsystems des Fahrzeuges in eine Fahrdynamik des Fahrzeuges der Reibwert anhand eines Verhältnisses einer Gesamtbeschleunigung des Fahrzeuges zur Erdbeschleunigung ermittelt wird und eine Fahrbahnglätte bestimmt wird, wobei ein Ort der Fahrbahnglätte einer Kommunikationsinfrastruktur des Fahrzeuges zur Information weiterer Verkehrsteilnehmer zugeführt wird.A method for determining a coefficient of friction between at least one vehicle wheel of a vehicle and a road surface provides according to the invention that during an automatic intervention of a vehicle dynamics control and / or active engagement of a drive or brake slip control system of the vehicle in a driving dynamics of the vehicle, the coefficient of friction based on a ratio of Total acceleration of the vehicle to the acceleration of gravity is determined and a road surface smoothness is determined, wherein a location of the road surface smoothness of a communication infrastructure of the vehicle is supplied to the information of other road users.
Mittels des Verfahrens wird die Fahrbahnglätte verhältnismäßig einfach und zuverlässig direkt erfasst und als Glätteinformation anderen Verkehrsteilnehmern, die Nutzer der Kommunikationsinfrastruktur sind, zur Verfügung gestellt.By means of the method, the road surface smoothness is detected relatively simply and reliably directly and provided as smoothness information to other road users who are users of the communication infrastructure.
Die Fahrbahnglätte wird direkt erfasst und wird nicht als potentielle Glättgefahr dargestellt.The road surface smoothness is detected directly and is not presented as a potential smoothness hazard.
Ausführungsbeispiele der Erfindung werden im Folgenden anhand einer Zeichnung näher erläutert.Embodiments of the invention will be explained in more detail below with reference to a drawing.
Dabei zeigt die:It shows:
In
An und/oder in dem Fahrzeug
Während des automatischen Regeleingriffes der Fahrdynamikregelung und/oder eines aktiven Eingriffs eines Antriebs- oder Bremsschlupfregelsystems wird anhand erfasster Signale der Erfassungseinheiten der Längsbeschleunigung und der Querbeschleunigung eine Gesamtbeschleunigung des Fahrzeuges
Mittels der Auswertung der Gesamtbeschleunigung während des automatischen Regeleingriffes wird ein Reibwert zwischen zumindest einem Fahrzeugrad
Dabei erfolgt die Ermittlung der Gesamtbeschleunigung des Fahrzeuges
- aFzg
- als Gesamtbeschleunigung,
- ax
- als Längsbeschleunigung und
- ay
- als Querbeschleunigung des Fahrzeuges
1 .
- a vehicle
- as total acceleration,
- a x
- as longitudinal acceleration and
- a y
- as lateral acceleration of the vehicle
1 ,
Fährt das Fahrzeug
Das Verhältnis zwischen der Gesamtbeschleunigung des Fahrzeuges
- μ
- als Reibwert.
- μ
- as a coefficient of friction.
Mittels dieser Gleichung kann der Reibwert ausreichend genau ermittelt werden.By means of this equation, the coefficient of friction can be determined with sufficient accuracy.
Unterschreitet der ermittelte Reibwert einen vorgegebenen Schwellwert für eine vorgegebene Zeitdauer und die ermittelte Gesamtbeschleunigung des Fahrzeuges
Fährt das Fahrzeug
Sind die oben genannten Bedingungen zur Inkrementierung des Zeitwertes nicht erfüllt, erfolgt eine Zurücksetzung des Zeitwertes.If the above conditions for incrementing the time value are not met, the time value is reset.
Ist der Zeitwert größer als ein vorgegebener Schwellwert von beispielsweise 500 ms, ist die Fahrbahn
In ähnlicher Weise können beim Beschleunigen, wenn ein Regler einer Antriebschlupfregelung ein Durchdrehen der Antriebsräder des Fahrzeuges
Auch kann die Gesamtbeschleunigung des Fahrzeuges
Die mittels des Verfahrens ermittelte Fahrbahnglätte wird als Information, beispielsweise als sogenannte Bit-Information, über ein im Fahrzeug
Eine Schutzfunktion des Fahrzeuges
Die Information wird somit anderen Verkehrsteilnehmern bereitgestellt, wobei die Information beispielsweise als ein Schriftzug ”Achtung Fahrbahnglätte” ausgegeben werden kann. Möglich ist auch eine stufenlose Reibwertinformation.The information is thus provided to other road users, where the information can be output, for example, as a lettering "Attention Fahrbahnglätte". Also possible is a continuous friction coefficient information.
Das Verfahren ermöglicht eine sichere Erfassung von Fahrbahnglätte, wobei diese erfasste Information anderen Verkehrsteilnehmern zur Verfügung gestellt wird, wodurch die Verkehrssicherheit erhöht werden kann. The method enables a secure detection of road surface smoothness, whereby this detected information is made available to other road users, whereby the traffic safety can be increased.
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 102007044184 A1 [0002] DE 102007044184 A1 [0002]
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE201410000527 DE102014000527A1 (en) | 2014-01-15 | 2014-01-15 | Method for determining coefficient of friction between vehicle wheel of vehicle and road surface, involves determining friction coefficient based on ratio of total acceleration of vehicle for acceleration due to gravity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE201410000527 DE102014000527A1 (en) | 2014-01-15 | 2014-01-15 | Method for determining coefficient of friction between vehicle wheel of vehicle and road surface, involves determining friction coefficient based on ratio of total acceleration of vehicle for acceleration due to gravity |
Publications (1)
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DE102014000527A1 true DE102014000527A1 (en) | 2014-08-14 |
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DE201410000527 Pending DE102014000527A1 (en) | 2014-01-15 | 2014-01-15 | Method for determining coefficient of friction between vehicle wheel of vehicle and road surface, involves determining friction coefficient based on ratio of total acceleration of vehicle for acceleration due to gravity |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007044184A1 (en) | 2007-09-15 | 2009-03-19 | Daimler Ag | Passenger protection unit controlling method for vehicle, involves adjusting maximum force exerted on reversible wind-up tightener for pre-tightening seat belt based on static friction and/or time period till reaching maximum force |
-
2014
- 2014-01-15 DE DE201410000527 patent/DE102014000527A1/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007044184A1 (en) | 2007-09-15 | 2009-03-19 | Daimler Ag | Passenger protection unit controlling method for vehicle, involves adjusting maximum force exerted on reversible wind-up tightener for pre-tightening seat belt based on static friction and/or time period till reaching maximum force |
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R081 | Change of applicant/patentee |
Owner name: BERNZEN, WERNER, DR.-ING., DE Free format text: FORMER OWNER: DAIMLER AG, 70327 STUTTGART, DE |
|
R084 | Declaration of willingness to licence | ||
R012 | Request for examination validly filed |