DE102007053143A1 - Motor vehicle, has set of run-flat tires with detection device for detecting condition of run-flat tires, and determination device determining remaining run distance depending on detected condition of run-flat tires - Google Patents

Abstract

The vehicle has a set of run-flat tires with a detection device for detecting condition of the run-flat tires. A determination device determines a remaining run distance depending on the detected condition of the run-flat tires. A measuring device measures a vehicle-related measurement value. A driving dynamics variables-determination device determines a value of a driving dynamics variable. A tire type determination device determines the type of run-flat tires. An output device is provided for an optical or acoustic output of the remaining run distance.

Description

The The invention relates to a motor vehicle having a plurality of runflat tires.

Especially Currently, runflat tires are establishing themselves in the premium motor vehicle sector. so-called run-flat tires. Runflat tires are runflat tires. they allow For example, the driver still has a maximum of 150 km (via this Value becomes a buyer a run-flat tire or a run-flat tire, for example a corresponding manual informed) far to drive, also before the runflat properties of the tire are so impaired, that a safe driving on is no longer possible. This is achieved for example, by stable side edges, a drop in the Rim on the tread prevent. This tire technology will improve traffic safety elevated. The dangerous one Tire change on the roadside or on the hard shoulder of the highway. In addition, the trunk offers by eliminating the spare tire more space.

• – Indirekte Systeme messen nicht den Reifendruck selbst. Im Falle eines Druckabfalls in einem Reifen verringert sich dessen Außendurchmesser, wodurch die Drehzahl dieses Rades in Relation zu den anderen ansteigt. Es wird also festgestellt, wenn ein Reifen sich im Vergleich zu den anderen drei Reifen durch Luftverlust schneller dreht. Dieser Drehzahlanstieg wird von den ohnehin im Fahrzeug enthaltenen ABS-Sensoren oder den Sensoren für eine Traktionskontrolle erfasst und als Druckabfall interpretiert, wodurch eine Warnung an den Fahrer ausgegeben wird.
• – Bei direkten Systemen wird innerhalb des Reifens oder auf dem Ventil ein Sensor angebracht, der mittels Funkübertragung in gewissen Intervallen den Innendruck und die Temperatur des Reifens an ein zentrales System überträgt. Diese Systeme können auch schleichende Druckverluste an allen Reifen erkennen, da sie direkt den Druck überwachen, anstatt aus Folgen eines zu geringen Drucks Rückschlüsse auf einen möglichen Druckverlust zu ziehen. Der Fahrer bekommt eine Information über den aktuellen Druckwert im Klartext, die er entweder ständig in der Anzeige sieht, oder über Knopfdruck abfragen kann.

Various tire pressure monitoring systems are also known for detecting the condition of a tire, in particular a puncture or puncture:

• - Indirect systems do not measure the tire pressure itself. In the case of a pressure drop in a tire, its outer diameter decreases, which increases the speed of this wheel in relation to the others. It is thus found when a tire rotates faster due to air loss compared to the other three tires. This increase in speed is detected by the ABS sensors or the sensors for a traction control which are already present in the vehicle and interpreted as a pressure drop, whereby a warning is issued to the driver.
• - In the case of direct systems, a sensor is installed inside the tire or on the valve, which transmits the internal pressure and the temperature of the tire to a central system by radio transmission at certain intervals. These systems can also detect creeping pressure drops on all tires, as they directly monitor the pressure, instead of drawing conclusions about possible pressure loss from the consequences of low pressure. The driver receives information about the current pressure value in plain text, which he either sees constantly in the display, or can query by pressing a button.

Of the Invention is now the object of the known motor vehicles to improve with run-flat tires.

These The object is solved by the features of the independent claim. Advantageous developments of the invention are subject to the dependent claims remove.

The Invention is based on the finding that the remaining distance of a Motor vehicle with run-flat tires, in particular after a damage on a run-flat tire, by various factors, such as the temperature or the vehicle speed becomes.

The Invention is also based on the thought of the remaining running distance of a Motor vehicle with run-flat tires depending on - the remaining distance influencing factors - reliable too predict. For example, by the display of appropriate information about becomes the residual running distance in the concrete situation it allows a driver in time but not hasty to approach a suitable parking lot or a suitable workshop.

One preferred motor vehicle has a plurality of runflat tires and a detection device for detecting the state at least of a run-flat tire. By a determination device, such as for example, a programmatically set up accordingly Processor device, a residual distance is dependent determined by the detected condition of the run-flat tire, in particular predicted, calculated or estimated.

The Detecting the condition of the run-flat tire can, for example, on the determination or estimate the tire pressure (air pressure), the temporal change in tire pressure and / or the difference in tire pressure of a runflat tire compared to another runflat tire. alternative or in addition this may include the detection of the condition of the run-flat tire, for example on the determination or estimate tire pressure correlating quantities such as detection or estimate the tire circumference, the tire speed or the distance between the road surface and the vehicle floor, based. The condition can in the simplest case be described by two values ("defective" or "not defective") or by a multivalued parameters, such as a number between 0 and 100, be described.

In addition, a measuring device for measuring a vehicle-related measured value, such as, for example, the outside temperature in the surroundings of the vehicle, is preferably provided, wherein the determining device is set up to determine a residual running distance as a function of the measured measured value. It is then to determine (forecast or estimate) of the remaining distance not only the detected state at least ei nes run-flat tire but also a vehicle-related measured value, such as the outside temperature in the environment of the vehicle used.

alternative or in addition this is a vehicle dynamics quantity determination device provided for determining the value of a vehicle dynamics quantity, wherein the determination device to determine a remaining distance in addition depending is set up by the determined value of the driving dynamics parameter.

Especially suitable for the forecast of the remaining distance is the consideration of the vehicle speed (For example, average speed and / or maximum speed, for example since detection of a defective run-flat tire), the lateral acceleration (for example, average and / or maximum, for example since Detection of a defective run-flat tire) and / or longitudinal acceleration (Average and / or maximum, for example, since the detection of a defective runflat tires) etc.

alternative or in addition For this purpose, the determination device for determining a residual distance also dependent from the weather, the precipitation, the type of road and / or the road surface etc. be set up.

A preferred development sees a tire type determining device for determining the runflat tire type, wherein the determining means for determining a remaining distance as a function of the determined Runflat tire type is set up. For example, the maximum Remaining run of a run-flat tire and / or the degree of influence this maximum residual distance by the above influencing factors be different types of runflat tires.

The Tire type determination can, for example, based on a Radio transmission of the Tire type of a radio identification element connected to the run-flat tire to a vehicle-side radio receiving device based.

alternative or in addition For this purpose, in particular a tire-type storage device on the vehicle side for storing the runflat tire type, for example in the frame the vehicle manufacturing process, provided, wherein the detection device for determining a residual distance in dependence on the stored Runflat tire type is set up. The type of tire can, for example as part of the vehicle manufacturing process or a tire change written to the storage device.

The Determination of the residual travel distance is preferably based on the Last determined residual distance and the distance traveled since then Track repeated. Alternatively or in addition to this, the determination the remaining distance from time to time based on an updated Database with regard to at least one of the influencing factors mentioned above repeated.

Especially preferred is an output device, such as a graphic display, for optical or acoustic output of the determined, in particular predicted, Remaining run provided.

in the The invention will be explained in more detail below with reference to examples.

It in the simplest case, a vehicle with run-flat tires is assumed, having a direct or indirect tire pressure monitoring system.

ever By tire type, the predicted residual distance, for example based on a specified by the tire manufacturer standard residual running distance.

Of the Condition of a run-flat tire is in a conventional manner only through two states described: "defective" or "not defective". The current state a run-flat tire is in a conventional manner, for example, by checking the tire pressure or indirectly detected by comparing the tire speeds, determined or determined.

results the tire condition is "defective", is replaced by a appropriately established detection device, in particular Processor device, as the predicted remaining distance first the Standard residual running distance determined and displayed.

In an embodiment variant This remainder of the course will be permanent corrected by the standard residual distance since the detection of the condition "broken" Distance is subtracted.

• – einen Geschwindigkeitsmesser,
• – ein Thermometer zum Messen der Außentemperatur,
• – einen Drucksensor in einem Notlaufreifen,
• – eine Niveauregelung zur Ermittlung des Beladungszustandes,
• – eine Stabilitätsregelung und/oder eine Erfassungs- und Auswerteeinrichtung für fahrdynamische Signale zum Ermitteln der Querbeschleunigung und/oder der Längsbeschleunigung und/oder zum Ermitteln des Höhenstandes des Fahrzeuges und/oder zur Ermittlung des Fahrbahnzustandes und/oder zum Ermitteln des Reifenumfanges und/oder zum Ermitteln des Profilzustandes,
• – einen Regensensor zur Ermittlung der Niederschlagsmenge,
• – eine Speichereinrichtung zum Speichern des Reifenalters, des Reifenmontagedatums, des Reifentyps, der mit dem Reifen bereits zurückgelegten Strecke und/oder der Reifenversion,
• – ein in oder an den Notlaufreifen jeweils angebrachtes Funkidentifizierungselement, das eine soeben genannte Speichereinrichtung umfassen kann, und das zum Senden der darauf gespeicherten Informationen eingerichtet ist,
• – eine Empfangseinrichtung zum Empfang der soeben genannten Informationen.

Further developments of this motor vehicle provide at least one of the following further components:

• - a speedometer,
• A thermometer for measuring the outside temperature,
• A pressure sensor in a run-flat tire,
• A level control for determining the loading condition,
• A stability control and / or a detection and evaluation device for driving dynamics signals for determining the lateral acceleration and / or the longitudinal acceleration and / or for determining the ride height of the vehicle Vehicle and / or to determine the road condition and / or to determine the tire circumference and / or to determine the profile state,
• A rain sensor for determining the amount of rainfall,
• A memory device for storing the tire age, the tire mounting date, the tire type, the distance already traveled with the tire and / or the tire version,
• A radio identification element mounted in or on the run-flat tire, which may comprise a storage device just mentioned, and which is set up to transmit the information stored thereon,
• - A receiving device for receiving the information just mentioned.

The data determined or collected by these components be in the context of developments of the invention completely or partly by the appropriately established investigation facility in the determination or forecast of a residual distance, which with the run-flat tire still with great Probably back for sure can be placed.

• – f (gemessene Fahrzeuggeschwindigkeit-Normgeschwindigkeit des Notlaufreifens): überschreitet die gemessene Fahrzeuggeschwindigkeit die Normgeschwindigkeit, so wird die Normrestlaufstrecke verringert; unterschreitet die gemessene Fahrzeuggeschwindigkeit die Normgeschwindigkeit, so wird die Normrestlaufstrecke verlängert.
• – f (gemessene Temperatur-Normtemperatur): überschreitet die gemessene Temperatur die Normtemperatur, so wird die Normrestlaufstrecke verringert; unterschreitet die gemessene Temperatur die Normtemperatur, so wird die Normrestlaufstrecke verlängert.
• – f (Querbeschleunigung): jede Querbeschleunigung ungleich Null verringert die Normrestlaufstrecke und führt damit zu einer kürzeren prognostizierten Restlaufstrecke.
• – f (Längsbeschleunigung): jede Längsbeschleunigung ungleich Null verringert die Normrestlaufstrecke; und führt damit zu einer kürzeren prognostizierten Restlaufstrecke.
• – f (Niederschlagsmenge): Niederschlag verlängert die Normrestlaufstrecke, da durch den Niederschlag die Reifen in der Regel kühler bleiben.
• – f (Zuladung): Zuladung reduziert die Normrestlaufstrecke.
• – f (Reifendruck): ein geringer oder zu geringer Reifendruck reduziert die Normrestlaufstrecke und führt damit zu einer kürzeren prognostizierten Restlaufstrecke.
• – f (Profilzustand): je schlechter der Profilzustand (ergibt sich beispielsweise aus dem Reifenalter und/oder der Abnahme des Reifenumfangs seit Reifenmontage) desto kürzer die prognostizierte Restlaufstrecke.
• – f (Fahrbahnzustand): je schlechter der Fahrbahnzustand desto kürzer die prognostizierte Restlaufstrecke.
• – f (Reifenalter): je älter der Reifen desto kürzer die prognostizierte Restlaufstrecke.

The determination of the predicted residual distance after the detection of a defective run-flat tire is based, for example, on an extension or shortening of said standard residual distance (possibly corrected by the distance traveled since the detection of the state "defective") due to various factors. These possible influencing factors are illustrated below by mathematical functions f and explained in more detail:

• - f (measured vehicle speed standard speed of the run-flat tire): if the measured vehicle speed exceeds the standard speed, the standard residual distance is reduced; If the measured vehicle speed falls below the standard speed, the standard residual running distance is lengthened.
• - f (measured temperature standard temperature): if the measured temperature exceeds the standard temperature, the standard residual running distance is reduced; If the measured temperature falls below the standard temperature, the standard residual running distance is extended.
• - f (lateral acceleration): each lateral acceleration not equal to zero reduces the standard residual distance and thus leads to a shorter predicted residual distance.
• - f (longitudinal acceleration): any non-zero longitudinal acceleration reduces the standard residual running distance; and thus leads to a shorter predicted residual distance.
• - f (Precipitation): Precipitation prolongs the normal residual running distance as precipitation generally keeps the tires cooler.
• - f (payload): payload reduces the standard residual running distance.
• - f (tire pressure): a low or too low tire pressure reduces the standard residual running distance and thus leads to a shorter predicted residual distance.
• - f (profile condition): the worse the profile condition (resulting for example from the age of the tire and / or the decrease of the tire circumference since tire mounting) the shorter the predicted residual distance.
• - f (road condition): the worse the road condition, the shorter the predicted remaining distance.
• - f (tire age): the older the tire, the shorter the predicted remaining distance.

A Such function f can also be the formation of an integral, a Sum or average of a measured or determined Include size.

Out the - through one of these factors, a selection of these factors or all of these Factors prolonged or reduced - standard residual distance results the predicted residual distance to be determined it can - as above explained - since the Detection of the tire damage already covered distance explicitly considered or by the appropriate design of the functions implicitly accounted for by this become.

The Standard residual distance is thus set by the corresponding Discovery device based on function values that are present Insert the currently measured or determined values into the corresponding values Functions f give corrected and into a prognosticated to be determined Remaining run distance implemented. This will be updated from time to time and displayed on a display.

Claims (8)

motor vehicle with a variety of runflat tires, With a detection device for detecting the state at least of a run-flat tire and with a detection device, to determine a residual distance in dependence on the detected Condition of the run-flat tire is set up. Motor vehicle according to claim 1 with a measuring device for measuring a vehicle-related measured value, wherein the determining device for determining a residual running distance as a function of the measured Measured value is set up. Motor vehicle according to one of the preceding claims with a vehicle dynamics quantity determination device for determining the value of a vehicle dynamics quantity, wherein the determination device for Determining a residual distance as a function of the determined Value of the driving dynamics parameter set up is. Motor vehicle according to one of the preceding claims with a tire type determining device for determining the runflat tire type, wherein the determining means for determining a residual distance dependent on is established by the determined Notlaufreifentyp. Motor vehicle according to one of the preceding claims with a tire type storage device for storing the runflat tire type, wherein the determining means for determining a residual distance dependent on is established by the stored runflat tire type. Motor vehicle according to one of the preceding claims, in the determination of the remaining distance based on the last determined residual distance and the distance traveled since repeated becomes. Motor vehicle according to one of the preceding claims, in the determination of the remaining distance based on updated Database is repeated. Motor vehicle according to one of the preceding claims with an output device for optical or acoustic output the remaining distance.