WO2007147675A1 - Procédé de mesure de la pression d'air dans un pneu de véhicule - Google Patents

Procédé de mesure de la pression d'air dans un pneu de véhicule Download PDF

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Publication number
WO2007147675A1
WO2007147675A1 PCT/EP2007/054389 EP2007054389W WO2007147675A1 WO 2007147675 A1 WO2007147675 A1 WO 2007147675A1 EP 2007054389 W EP2007054389 W EP 2007054389W WO 2007147675 A1 WO2007147675 A1 WO 2007147675A1
Authority
WO
WIPO (PCT)
Prior art keywords
tire
acceleration
signal
determined
pressure
Prior art date
Application number
PCT/EP2007/054389
Other languages
German (de)
English (en)
Inventor
Thorsten Pannek
Franz Laermer
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2007147675A1 publication Critical patent/WO2007147675A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
    • B60C23/064—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle comprising tyre mounted deformation sensors, e.g. to determine road contact area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/20—Devices for measuring or signalling tyre temperature only

Definitions

  • the present invention relates to a method, an arrangement and a computer program for measuring the air pressure in a vehicle tire while driving, wherein an acceleration sensor is arranged in the tire and generates a signal representing a centripetal acceleration in the tire.
  • in-vehicle devices for monitoring the air pressure in the tire. These devices have a stationary device which interacts with a device moving together with the respective wheel of the vehicle, so that monitoring of the air pressure in the tire can take place during vehicle operation.
  • the moving device senses by appropriate means the air pressure in the tire and transmits a wireless signal to the fixed device. If the air pressure falls below a certain value, the fixed device gives an optical or acoustic
  • the object of the present invention is therefore to provide a device and a method for monitoring the air pressure in a vehicle tire while driving, by means of which the measurement of the tire pressure takes place in a simple and cost-effective manner with a high reliability.
  • the tire pressure is preferably determined on the basis of a time ratio determined from the signal, which represents a change in the centripetal acceleration during a wheel revolution.
  • the tire pressure is determined from the length of a support surface of the tire on a roadway. It is preferably provided that the ratio of the longitudinal extent of the bearing surface of the tire on the roadway to the total circumference of the tire is determined by means of the time ratio measured from the signal of the acceleration sensor.
  • the acceleration sensor is mounted inside the tread of the tire such that a
  • Zentripetalbeatung is determined in the tire to be tested, wherein the tire pressure is determined based on a determined by the acceleration signals time ratio, which represents a change in the Zentripetalbeatung during a Radumlaufs.
  • the inventive solution is achieved that with comparatively simple metrological means, namely by the provision of an integrated inside the tire acceleration sensor, the change from a large acceleration signal to a small signal near 0, ie a signal below a lower limit, or a disturbed rapidly fluctuating signal can be analyzed to see if the tire pressure is optimal or not.
  • an acceleration sensor for determining the tire pressure
  • a pressure sensor and the associated necessity of media contact with the sensor module in the tire can be dispensed with.
  • the inventive device which provides an acceleration sensor can, as a self-contained device with hermetically encapsulated sensors are executed.
  • the measuring system is thus isolated from the aggressive atmosphere in the tire in a simple and cost effective manner. This avoids that harmful corrosion in the module and thereby significantly affect the reliability of the measuring system.
  • the device may preferably include an additional temperature sensor, wherein the physical variables determined from the signal of the acceleration sensor, in particular acceleration sensor data, are corrected by the tire temperature measured with a temperature sensor.
  • the temperature of the tire rubber gives another indication of whether the tire pressure has been chosen to be adequate or too low under the load of the ride, in the sense of a redundant measured variable. Too high a tire pressure makes the temperature no statement. High temperature generally corresponds to high material wear per unit time, low temperature - correspondingly lower material wear per unit of time. Integration of the wear data allows e.g. a statement about the remaining life of the
  • this combination of an acceleration sensor and a temperature sensor in a measuring system not only provide a redundant variable for a too low tire pressure but can also serve as a tire wear indicator.
  • an arrangement for measuring the air pressure in a vehicle tire while driving wherein an acceleration sensor is arranged in the tire and generates a signal representing a centripetal acceleration in the tire, wherein the tire pressure from the time course of Signal is determined.
  • a piezoelectric or otherwise type of vibration transducer which also serves as an energy converter for generating electrical energy from the vibration, a so-called "power harvester” or a "power harvesting device”.
  • the fact that the signal of this "power harvester" in the form of a piezoelectric vibration transducer can also be used as a measuring system for determining the acceleration forces in the tire eliminates the need for an additional acceleration sensor.
  • the vibration transducer can preferably be attached as a piezo strip parallel to the tire tread and for generating electrical signals from the acceleration signals of the
  • Acceleration sensor can be used, wherein the electrical signals to power a sensor electronics and at the same time serve as acceleration signals for determining the tire pressure. Thus eliminating the need for a separate acceleration sensor or a pressure sensor for tire pressure determination. However, it is also possible to use an additional pressure sensor for direct tire pressure determination or a separate acceleration sensor in addition to the piezoelectric or whatever vibration transducer. In the latter case, the acceleration sensor may be piezoelectric or as a silicon sensor, e.g. be implemented as a surface micromechanical acceleration sensor in Si technology.
  • the acceleration sensor and optionally the other sensors which form a sensor system for. B. vulcanized by means of a standard Vulkanisiervons in the tire and thus integrated into this without accesses from the tire interior to the sensor system vorhalten or later created, since the recovery of an acceleration signal is a measurement principle that basically requires no media contact.
  • Fig. 1 is a schematic diagram of a vehicle wheel
  • Fig. 2 is a graph in which the dependency of the centripetal acceleration on time is plotted.
  • Figure 1 shows a sketch of a simplified representation of a vehicle wheel 1 with a vehicle tire 2.
  • the vehicle tire 2 includes a tread 9 and a generally filled with air tire inner 10.
  • the air has a pressure (static pressure equal to total pressure) of p.
  • an acceleration sensor 3 which transmits an electromagnetic signal via a sensor 4, e.g. is arranged axially fixed or body-fixed, transmits to an evaluation device 5.
  • a temperature sensor 11 may be disposed in the tire that generates a signal representing tire temperature (temperature of the tire tread and / or air temperature within the tire and / or temperature within the material of the tread, depending on the location of the sensor) and also electromagnetically transmits to the evaluation.
  • the evaluation device 5 is part of a control unit 6, which is connected to the display device 7 in the field of vision of a driver in a motor vehicle.
  • the vehicle tire 2 rolls on a roadway 8.
  • the roadway has a surface texture, which is characterized in particular by the material of the surface and its physical properties. These include bumps, e.g. in the form of waves, grooves or foreign bodies. Likewise, coverings such as e.g. Water on the surface the contact between tire and road surface.
  • the vehicle weight is known to be distributed to the wheels, with each wheel having to carry a partial weight G of the vehicle over the surface A of the road surface, as shown in the schematic diagram.
  • the tire pressure p thus carries this weight G by means of a support surface A of the tire on the road.
  • the length of the support surface IA is the decisive factor by which it is decided whether the Tires are operated "correctly” or "incorrectly” on the vehicle.
  • the correct bearing surface is adjusted in a conventional manner on the tire pressure p. If the tire pressure p is too low, the bearing surface A becomes too large and the tire is too heavy. This would lead to overheating and excessive wear and fuel consumption.
  • the tire pressure p is too high, the bearing surface is too small and the force transmission tire road is accordingly not optimal, which can have a detrimental effect eg during acceleration or during a braking maneuver. If the vehicle is loaded with additional loads or freed from them, the tire pressure usually has to be raised or lowered in order to set the correct tire-road contact surface again.
  • the length of the support surface A in the direction of travel or their relative proportion relative to the total circumference of the tire can be determined by means of acceleration measurement. As the acceleration sensor traverses that portion of the path corresponding to the tire circumference, it determines the centripetal acceleration, which generally takes on the order of 10 g to a few 100 g. The acceleration sensor goes through that part of the
  • the acceleration signal is almost 0, and there are vibrations or disturbances de road surface determined.
  • the signal is a very irregular, rapidly varying, relatively small acceleration signal.
  • FIG. 2 shows a diagram in which the dependency of the centripetal acceleration, ie the acceleration perpendicular to the tire circumference, is graphically represented over time.
  • the centripetal acceleration on the tire circumference results directly from the wheel rotation and the tire radius, ie the distance between the center of the axle and the tire surface in which the measurement takes place.
  • the periods of passage of the "free" circumference (T - ⁇ ) of the tire and of the contact area with the roadway ⁇ can be measured accurately
  • Absolute values or an absolute and accurate measuring acceleration sensor are not required per se. Rather, it only depends on the change from a large signal to a small signal near 0 or to a disturbed rapidly fluctuating signal.
  • the time ratio thus determined is the actually relevant measure of the tire pressure. An increase over time of this ratio can be interpreted in a manner known per se with a certain rate as critical tire pressure decrease.
  • a warning to the driver can be submitted, for example, an optical and / or acoustic signal. It is also possible to separately monitor all the tires of a vehicle separately and to provide an individual indication of the tire pressure of each tire, or to make an individual on each tire air pressure monitoring, which, however, results in a total only a single message signal. In this case, after the warning signal has been heard, the driver must check which tire has led to the alarm being triggered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un procédé qui permet de mesurer la pression d'air (p) dans un pneu de véhicule (2) pendant la marche, un capteur d'accélération (3) étant placé dans le pneu et générant un signal qui représente une accélération centripète (aZ) dans le pneu (2). La pression de pneu (p) est déterminée à partir de la variation dans le temps du signal.
PCT/EP2007/054389 2006-06-21 2007-05-07 Procédé de mesure de la pression d'air dans un pneu de véhicule WO2007147675A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610028412 DE102006028412A1 (de) 2006-06-21 2006-06-21 Verfahren zur Messung des Luftdrucks in einem Fahrzeugreifen
DE102006028412.7 2006-06-21

Publications (1)

Publication Number Publication Date
WO2007147675A1 true WO2007147675A1 (fr) 2007-12-27

Family

ID=38315265

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/054389 WO2007147675A1 (fr) 2006-06-21 2007-05-07 Procédé de mesure de la pression d'air dans un pneu de véhicule

Country Status (2)

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DE (1) DE102006028412A1 (fr)
WO (1) WO2007147675A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010041768A1 (de) * 2010-09-30 2012-04-05 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur näherungsweisen Ermittlung des Durchmessers eines Fahrzeug-Rades

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7673505B2 (en) * 2008-08-01 2010-03-09 Infineon Technologies Ag Tire footprint determination apparatuses, systems and methods
IT1403280B1 (it) * 2010-12-23 2013-10-17 Pirelli Metodo e sistema per stimare la pressione di gonfiaggio di un pneumatico
CN103260911B (zh) 2010-12-23 2016-10-19 倍耐力轮胎股份公司 估算作用在轮胎上的负载的方法和系统
US10875539B2 (en) 2018-08-22 2020-12-29 Infineon Technologies Ag Tire load estimation
FR3131562B1 (fr) * 2022-01-06 2023-11-17 Continental Automotive Procédé et système de détection de fuite d’un pneumatique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002092364A2 (fr) * 2001-05-15 2002-11-21 Wilson Kitchener C Systeme, appareil et procede de surveillance d'automobiles et de pneus d'automobiles
WO2005056311A2 (fr) * 2003-12-11 2005-06-23 Conti Temic Microelectronic Gmbh Transpondeur detecteur et procede de mesure de la longueur de soulevement de pneumatique et de la charge de roue
DE102004031810A1 (de) * 2004-07-01 2006-01-26 Continental Aktiengesellschaft System zur Erzeugung elektrischer Energie für elektronische Komponenten
JP2006142991A (ja) * 2004-11-19 2006-06-08 Yokohama Rubber Co Ltd:The タイヤ滑り状態検出方法及びタイヤ滑り状態検出装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002092364A2 (fr) * 2001-05-15 2002-11-21 Wilson Kitchener C Systeme, appareil et procede de surveillance d'automobiles et de pneus d'automobiles
WO2005056311A2 (fr) * 2003-12-11 2005-06-23 Conti Temic Microelectronic Gmbh Transpondeur detecteur et procede de mesure de la longueur de soulevement de pneumatique et de la charge de roue
DE102004031810A1 (de) * 2004-07-01 2006-01-26 Continental Aktiengesellschaft System zur Erzeugung elektrischer Energie für elektronische Komponenten
JP2006142991A (ja) * 2004-11-19 2006-06-08 Yokohama Rubber Co Ltd:The タイヤ滑り状態検出方法及びタイヤ滑り状態検出装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010041768A1 (de) * 2010-09-30 2012-04-05 Bayerische Motoren Werke Aktiengesellschaft Verfahren zur näherungsweisen Ermittlung des Durchmessers eines Fahrzeug-Rades

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Publication number Publication date
DE102006028412A1 (de) 2007-12-27

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