EP2035243A1 - Procédé de détection de l'état d'un pneu - Google Patents

Procédé de détection de l'état d'un pneu

Info

Publication number
EP2035243A1
EP2035243A1 EP07728388A EP07728388A EP2035243A1 EP 2035243 A1 EP2035243 A1 EP 2035243A1 EP 07728388 A EP07728388 A EP 07728388A EP 07728388 A EP07728388 A EP 07728388A EP 2035243 A1 EP2035243 A1 EP 2035243A1
Authority
EP
European Patent Office
Prior art keywords
tire
signal
roadway
vehicle
determined
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.)
Withdrawn
Application number
EP07728388A
Other languages
German (de)
English (en)
Inventor
Thorsten Pannek
Franz Laermer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
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 EP2035243A1 publication Critical patent/EP2035243A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • B60T8/1725—Using tyre sensors, e.g. Sidewall Torsion sensors [SWT]
    • 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
    • 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
    • B60T2210/00—Detection or estimation of road or environment conditions; Detection or estimation of road shapes
    • B60T2210/10—Detection or estimation of road conditions
    • B60T2210/12—Friction
    • 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
    • B60T2210/00—Detection or estimation of road or environment conditions; Detection or estimation of road shapes
    • B60T2210/10—Detection or estimation of road conditions
    • B60T2210/14—Rough roads, bad roads, gravel roads

Definitions

  • the present invention relates to a device, a method and a computer program for detecting the state of a vehicle tire and / or a roadway, wherein at least one arranged inside the tire sensor, in particular an acceleration sensor, generates a signal associated with physical sizes of the vehicle tire and / or the roadway ,
  • in-vehicle devices for monitoring the tire condition, in particular for tire air pressure monitoring.
  • These devices have a fixed device which cooperates with a device moving together with the respective wheel of the vehicle, so that monitoring of the air pressure can take place during vehicle operation.
  • the moving device senses by appropriate means the air pressure and transmits the measured values by a tactless signal to the fixed device, which informs the driver when the air pressure falls below a certain value.
  • the object of the present invention is therefore to specify a method, a device and a computer program for detecting the state of a vehicle tire and / or a roadway, by means of which a powerful system for determining the tire and roadway properties can be realized in a simple and cost-effective manner with high reliability can.
  • a method for detecting the state of a vehicle tire and / or a roadway wherein at least one arranged inside the tire sensor, in particular an acceleration sensor, generates a signal that is associated with physical sizes of the vehicle tire and / or the roadway, based on the signal a tire condition and / or properties of the road, in particular the road surface, are determined.
  • the periods of passage of the "free" circumference of the tire (T - ⁇ ), and of the contact area with the roadway ⁇ are accurately detected and analyzed with the aid of the acceleration signals, where T is the period duration, with only the change of one large acceleration signal to a relatively small signal or to a disturbed rapidly fluctuating signal, which characterizes the contact of the acceleration sensor with the road.
  • the signal component is determined in a simple and cost-effective manner and subsequently analyzed, which is decisive for the tire condition and for the roadway condition, namely the signal component during which the sensor rolls over the roadway in each case.
  • the tire condition and for the roadway condition namely the signal component during which the sensor rolls over the roadway in each case.
  • the sensor generates a signal which represents periodically alternating phases of a centripetal acceleration, the signal being of a physical magnitude in phases in which the signal falls below a lower limit (almost zero).
  • a lower limit which represents the tire condition and / or the properties of the road, in particular the road surface, is assigned.
  • the lower limit is chosen so that the signal strength is significantly smaller than in the phases in which the acceleration sensor is not in the area of contact with the road surface.
  • the time range is filtered out, in which the acceleration sensor is at the contact surface with the road.
  • the acceleration sensor is mounted inside the tread of the tire such that periodically alternating phases of centripetal acceleration can be detected with it.
  • the acceleration sensor determines acceleration signals which are supplied to an evaluation device provided within the vehicle tire or vehicle interior, wherein display means are provided which, in response to a signal from the evaluation device, identify the tire and / or tire Show road condition.
  • a signal spectrum is obtained from the signal, wherein the determined signal spectrum at least partially contains vibrations which are generated by the movement of a part of the tread of the vehicle tire adjacent to the acceleration sensor when rolling on the roadway. It is advantageous that the signal spectrum determined by the acceleration sensor contains all vibrations which are generated by the movement of a part of the outer tread of the vehicle tire adjacent to the acceleration sensor when rolling over the roadway. This can be both acceleration values in the radial direction and / or those parallel to the roadway or to the direction of travel.
  • the signal spectrum is filtered and the signal components determined thereby are analyzed according to their signal strength in order to obtain quantitative statements regarding the tire condition and / or the road condition.
  • This analysis can be performed using dynamically adaptable to the wheel speed filter components or a Fourier analyzer.
  • a Fourier analysis or other type of spectral filtering and signal strength analysis can be carried out within the tire or preferably centrally in the control unit in the vehicle. Prior to transmission to the central controller, it is advantageous if the data is compressed appropriately to reduce the amount of data.
  • a desired tire signal strength and a desired frequency spectra of the signal spectrum are assigned to a vehicle tire or a tire profile and an actual signal Signal strength and an actual frequency spectrum of the signal spectrum is determined and from this a profile height and material properties of the vehicle tire can be determined by a comparison with the desired signal strength and the desired frequency spectra.
  • the desired signal strength and the desired frequency spectra are a characteristic of the respective vehicle tire or the tire type or the series of tires.
  • the profile height and the material properties of the vehicle tire are determined on the basis of the signal strength and the frequency spectra of the signals characteristic of the tire profile, wherein the vehicle characteristics, in particular irregularities, can be determined on the basis of low-frequency signal components detected by the acceleration sensor.
  • the material properties eg the elasticity of the rubber, can be estimated so that signs of wear or embrittlement can be recognized early. Distortions of the tire can be detected at least when they relate to the environment of the acceleration sensor. The rolling behavior on the roadway can also be analyzed.
  • the roadway characteristics in particular obstacles and irregularities, can be determined.
  • the road condition can be roughly estimated, in particular, a very quiet (smooth) roadway can give an early indication of dangerous water retention or ice formation on the road.
  • a tire pressure in the vehicle tire is determined on the basis of the signal.
  • the acceleration sensor is used for measured value recording, wherein it is oriented in the tire such that it determines a centripetal acceleration and / or acceleration values in the direction parallel to the roadway or to the direction of travel.
  • Absolute values or an absolute and accurate measuring acceleration sensor are not required per se. Rather, as already mentioned above, it only depends on the change from a large signal to a small signal near 0 or to a disturbed rapidly fluctuating signal.
  • the actually relevant measure of the tire pressure is a determined time ratio of the duration of a small to a large signal ( ⁇ / T). 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 device for detecting the state of a vehicle tire and / or a roadway wherein at least one sensor arranged in the tire interior, in particular an acceleration sensor, generates a signal, the physical parameters of the vehicle tire and / or the roadway is assigned, characterized in that based on the signal, a tire condition and / or properties of the road are determined.
  • the signal is supplied to an evaluation device provided within the vehicle tire or in the vehicle interior, wherein at least one display means is arranged in the vehicle, which indicates the tire and / or the road condition in response to a signal of the evaluation device.
  • the acceleration sensor is designed as a piezoelectric transducer element and vulcanized into the vehicle tire .
  • the acceleration sensor is mounted in such a manner inside the tread of the tire that periodically changing phases of a Zentripetalbeatung a z are detected with the acceleration sensor, wherein in the Phases in which the centripetal acceleration is almost 0, the acceleration sensor determines acceleration signals which are supplied to an evaluation device provided within the vehicle tire or in the vehicle interior.
  • Display means are preferably provided which indicate the tire and / or the road condition in response to a signal from the evaluation device.
  • Figure 1 is a schematic diagram of a vehicle wheel, which rests on the surface A on the road.
  • Fig. 2 is a diagram in which the course of the Zentripetalbevant is plotted in time.
  • 1 shows a sketch of a simplified representation of a vehicle wheel 1 with a vehicle tire 2.
  • the vehicle tire 2 comprises a tread 9 and a generally filled with air tire inner 10.
  • an acceleration sensor 3 is arranged, which is an electromagnetically Signal via a transducer 4, which is arranged, for example, axially fixed or body-mounted, transmits to an evaluation device 5.
  • 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. This also includes bumps, for example in the form of waves, grooves or foreign bodies. Likewise, coverings such as water on the surface change the contact between the tire and the 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 tire is operated "right” or "wrong” 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, then the support surface is too small and the tire pulley transmission is accordingly not optimal, which may occur e.g. when accelerating or during a braking maneuver can be harmful. 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.
  • Total circumference of the tire is determined by means of acceleration measurement.
  • the accelerometer passes through the portion of the path corresponding to the circumference of the tire, it determines the centripetal acceleration, which generally takes on the order of 10 g to a few 100 g.
  • the acceleration sensor passes through that part of the web which corresponds to the contact surface A with the road, the acceleration signal is almost 0, or there are vibrations or disturbances of the road surface determined, in each case a very irregular, rapidly varying, relatively small acceleration signal. This signal contains information about the condition of the tire and the condition of the road.
  • FIG. 2 shows a diagram in which the dependency of a centripetal acceleration a z , ie the acceleration perpendicular to the tire circumference, is graphically represented by the time t. This process results for an approximately punctiform or relatively small acceleration sensor mounted on the inside of the tire tread.
  • the centripetal acceleration a z on the tire circumference results directly from the wheel rotation and the
  • Tire radius i. the distance: Axis center to the tire surface in which the measurement takes place.
  • centripetal acceleration is:
  • LA / 2 ⁇ r ⁇ / T.
  • the acceleration sensor detects signals that are partly characteristic of the road surface, but in part also of the tire and its properties.
  • a signal spectrum is detected which contains all the vibrations which are generated by the movement of the part of the tread of the vehicle tire adjacent to the acceleration sensor when rolling over the roadway.
  • This spectrum contains a periodicity that results from the tire tread, ie the pits and bumps periodically introduced into the tire.
  • This Changing the profile height produces a characteristic noise with frequencies resulting from the groove or profile distance and the circumferential speed of the tire or the rolling speed over the roadway and the profile height. It is obvious that a larger profile height delivers stronger signals than a low profile height.
  • these vibrations also depend on the elasticity properties of the tire rubber. Changes in the elasticity also change the vibration behavior and thus the signal strengths and frequency spectra of the characteristic of the tire tread signals, ie spectrally at the frequencies that have the tire profile as a source in the sense of their origin during unwinding.
  • the signal of the acceleration sensor is composed of a number of spectral components which, related to one another, permit statements about tire and road conditions.
  • the sensor signal contains slower signal components, which result from irregularities of the roadway, e.g. from a cobblestone pavement that creates a periodic structure and thus generates characteristic frequencies with the unwinding speed and the tire together. These frequencies are significantly lower frequency than the signal components originating from the tire profiles, since the characteristic distances on the roadway are generally greater than the profile distances on the tire tread. Such roadway periods can even be greater than the rolling surface of the tire on the road and then often no longer be perceived.
  • nonperiodic "spontaneous" signal components such as obstacles, cracks,
  • a device can be obtained by the use of one or more acceleration sensors, which is preferably designed as a piezoelectric transducer element, not only information about critical tire and road properties, but also monitors the correct tire pressure and in the sense of "power harvesting ", the energy required for the system is obtained, and only an additional expenditure is made with respect to the evaluation electronics in that, by means of spectral filters or Fourier analysis, those frequency components during the deceleration phases of the acceleration Sensors above the roadway must each be isolated and analyzed according to their spectral strength, which are characteristic of the tire behavior and certain road characteristics.
  • Tire pressure sensor a separate acceleration sensor e.g. an OMM-Si sensor o- the piezoelectric sensor for the acceleration during the rolling during the rolling phases, and a "power harvester", for example, a piezoelectric or otherwise type of generator for generating energy in the tire from vibrations. All of these components can be accommodated in a single component
  • the acceleration sensors can each detect different acceleration directions, ie, for example, parallel to the roadway and / or perpendicular to the roadway in the radial direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Tires In General (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un procédé de détection de l'état d'un pneu de véhicule (2) et/ou d'une chaussée (8), au moins un capteur (3) placé à l'intérieur (10) du pneu, en particulier un capteur d'accélération, générant un signal associé à des grandeurs physiques du pneu de véhicule (2) et/ou de la chaussée (8). Un état du pneu et/ou des propriétés de la chaussée (8) sont déterminés à partir dudit signal.
EP07728388A 2006-06-21 2007-04-23 Procédé de détection de l'état d'un pneu Withdrawn EP2035243A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006028411A DE102006028411A1 (de) 2006-06-21 2006-06-21 Verfahren zur Reifenzustandserkennung
PCT/EP2007/053931 WO2007147662A1 (fr) 2006-06-21 2007-04-23 Procédé de détection de l'état d'un pneu

Publications (1)

Publication Number Publication Date
EP2035243A1 true EP2035243A1 (fr) 2009-03-18

Family

ID=38179629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728388A Withdrawn EP2035243A1 (fr) 2006-06-21 2007-04-23 Procédé de détection de l'état d'un pneu

Country Status (5)

Country Link
US (1) US8332092B2 (fr)
EP (1) EP2035243A1 (fr)
JP (1) JP2009539667A (fr)
DE (1) DE102006028411A1 (fr)
WO (1) WO2007147662A1 (fr)

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CN114537358B (zh) * 2021-12-03 2023-05-02 上海拿森汽车电子有限公司 一种车辆制动间隙的补偿方法、装置及计算机存储介质
CN114537351B (zh) * 2021-12-07 2023-05-02 上海拿森汽车电子有限公司 盘片间隙消除方法及系统
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US20090210111A1 (en) 2009-08-20
DE102006028411A1 (de) 2007-12-27
WO2007147662A1 (fr) 2007-12-27
JP2009539667A (ja) 2009-11-19
US8332092B2 (en) 2012-12-11

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