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
• • 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
  • B60C23/067—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 by monitoring chassis to ground distance
• • 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
  • B60C23/068—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 by monitoring chassis to tyre distance

Definitions

• the invention relates to a device for detecting the state of a tire on a wheel of a vehicle according to the closer defined in the preamble of claim 1.
• devices operating according to different principles are known for determining a tire condition, which devices are generally designed to determine the correct air pressure of the tire and use sensors to determine status data of the tire and output to a receiving unit of the vehicle and / or status data the tire by means of on-board control and regulating systems such as an anti-lock braking system, an electronic stability program or an electrohydraulic brake system.
• Tire condition detection with on-board systems that use speed sensor information and vehicle information from, for example, systems connected to an engine / transmission control disadvantageously do not reflect real tire condition values, but only auxiliary calculations and estimates. In addition to the associated inaccuracy such a determination of a tire condition is also slow due to the system and requires depending on the driving dynamics longer covered distance with the vehicle.
• a tire condition determination by means of a sensor which outputs the determined values wirelessly to a receiving unit of the vehicle is, for.
• a transponder is for detecting, storing and transmitting tire condition parameter data for a vehicle tire, the transponder being connected to a power supply and an antenna and outputting tire condition parameter data, in particular the air pressure and the temperature, to the interrogation means in response to an interrogation signal of a vehicle side interrogation means.
• a disadvantage of such a method is that only special tires with the corresponding magnetic waves may be used and the number of state data of the tire obtainable hereby is low.
• a device for detecting the state of a tire on a wheel of a vehicle having at least one sensor has in an embodiment according to the invention, according to which at least one vehicle-side sensor is provided, which determines a distance to at least one measurement target fixed to the tire representing values and outputs to an evaluation device , Which determines therefrom state data of the tire, first the advantage that the vehicle-mounted arrangement of the at least one sensor enables a simple power supply and data transmission.
• the use of the distance information between the at least one sensor and a measurement target fixed to the tire also makes it possible to make reliable and fast statements about a large number of condition data of the tire.
• the monitoring of the distance between a measurement target on an edge of the tire in the region of its bearing on the road surface and the sensor allows rapid statements about a pressurized state and a loaded state of the tire, since a shortening of this critical distance a less filling or high load on the tire.
• the distance measurement allows statements about the type of loading of the tire, such as a torsional load, and about a tire surface condition, as well as bumps, dents, fragmentation and possibly driven into the tire nails are detected by a distance measurement.
• d. H. the presence of a nominal profile height or a minor profile height, can be detected by the device according to the invention.
• a periodic measurement signal can also be a possibly present unbalance condition of the tire determine.
• the at least one sensor can be designed such that it determines distance values and / or speed values of the at least one measurement target.
• the at least one sensor may be arranged statically on the vehicle chassis, for. B. fixed to an axle of the vehicle.
• the sensor can also be connected to a dynamically connected to the vehicle chassis component such.
• a shock absorber with the advantage that a dynamic measurement is feasible, can be tracked in the dynamic changes in the driving condition, such as acceleration, deceleration and cornering based on the tire deformation.
• a first measurement target is set on a sidewall of the tire, the distance to such a measurement target being very meaningful, in particular when determining the filling state and the load condition of the tire.
• measurement targets in the area of the bead zone or in the region of the shoulder zone in the transition to the tread of the tire can also be defined, the latter permitting monitoring of the tread width of the tire.
• a rotating reference measurement target on the wheel is defined as another measurement target, a simple self-calibration of the at least one sensor for detecting the state of a tire is advantageously also possible.
• a reference measurement target may be, for example, an area of a rim flange.
• the validity of a state information relating to the tire can be further increased by the fact that another measurement target is a driving surface, wherein the height of the sensor relative to the driving surface is determined as the distance.
• the sensor can operate to detect the distance to the at least one measurement target according to different known measurement principles, wherein in particular an electromagnetic sensor, such as a radar sensor, is advantageous, which also determines a velocity component of the detected measurement range.
• an electromagnetic sensor such as a radar sensor
• the sensor can also be used as an optical sensor, in particular as Lidarsensor or an image capture device, or as an acoustic sensor, such as.
• an ultrasonic sensor may be formed.
• a radar sensor either with a fixed antenna the entire range of distances can be scanned or by using a scanning antenna an angular resolution can be generated via a patch array or a mechanical pivoting.
• Optical systems which on an image capture z. B. based on video, can be designed analog, wherein the detection of mirrors is also conceivable for detecting different angular ranges.
• the status data of the tire determined with the device according to the invention can be provided by the evaluation device in an advantageous embodiment of the invention to a network with control / regulating systems of the vehicle connected thereto.
• control / regulating systems can act in a motor vehicle on the drive and the transmission of the vehicle or on individual features or safety and information modules.
• Examples of such control / Control systems include anti-lock brake system, electrohydraulic braking system, ie a combination of electronic and hydraulic brakes, anti-slip control, electronic stabilization program, automatic tire pressure control with automatic filling, steering of an axle air spring, electronic damper control, light control , a headlight range control, and a vehicle-to-vehicle communication or vehicle-to-control center communication, with which a maintenance or breakdown point can perform a remote diagnosis.
• the evaluation unit In order to indicate to the driver and / or a maintenance person that there is a deviation of a tire condition from a standard condition which requires action on the part of the driver or the maintenance person, it is expedient for the evaluation unit to send a corresponding signal to an optical and / or acoustic and / or or haptic display device of the vehicle outputs.
• the device according to the invention can also interact with a storage and receiving device known per se, in which, for example by means of a transponder technology, data is transmitted from a transmitter in the tire to a vehicle-side receiving device.
• tire-specific data which is z. B. refer to the make, the production and the maximum permissible speed of the tire concerned, or additional pressure and temperature values are transmitted.
• data determined by a storage device of the tire via its cv may be retrievable, which thus are also available after a tire change and provide information that can not be detected via a purely on-vehicle determination of the tire condition.
• the device according to the invention proves to be very advantageous, in particular in a motor vehicle, this is not limited to motor vehicles, but can be used with all wheel-mounted movement means.
• a device for detecting the state of a tire according to the invention may be advantageous.
• Figure 1 shows a detail in a simplified cross-section of a suspension of a motor vehicle, wherein a device according to the invention for detecting the state of a tire on the shown wheel of the motor vehicle is provided;
• Figure 2 shows two possible mounting positions of a sensor of the device according to the invention in a suspension of a vehicle
• Figure 3 is a diagram showing the association of signal amplitudes to a distance between a sensor of the device according to the invention and a detected measurement target on the tire;
• FIG. 4 shows a flow diagram of a method for detecting the state of a tire with the device according to the invention.
• a device for detecting the state of a tire 2 on a wheel 3 of the motor vehicle 1 is shown in a motor vehicle 1, wherein on the vehicle side, a sensor 4 is provided, which for determining a state or specific condition data of the tire 2 at least one distance to a the tire 2 determined measurement target and outputs to an evaluation device 8.
• the sensor 4 which in the present case is designed as a radar sensor, measures a distance to a first measuring target 5 fixed to a flank of the tire 2, wherein a reference to a defined standard state of the tire 2 is given by the reference numeral Dl and a reference numeral Dl 'to a shortened distance z.
• B. is shown at a reduced pressure state of the tire 2 and a dashed line shown, deformed tire contour.
• a second distance D2 determined by the sensor 4 represents a reference distance between the sensor 4 and a reference measuring target 6 on the wheel 3, wherein the reference measuring target 6 is set here on a rim flange of a rim 13 of the wheel 3.
• the rim flange of the rim 13 is particularly suitable for establishing a reference measurement target, since no shape changes or changes in position are to be expected at this area of the rim 13 without accident of the vehicle.
• reference numeral D3 a distance in the normal state of the tire 2 and with reference D3 'a shortened distance in the dashed tire contour indicated reduced pressure condition of the tire 2 is shown.
• the evaluation device 8 determines from the distance values or the changes of the distance values state data of the tire 2 and makes them available to a network 9 presently configured as a CAN bus system with control / regulating systems 10, 11 connected thereto and display devices 12 of the motor vehicle 1.
• a first position Pl shows the arrangement of the sensor 4 on a dynamically vibrating with the wheel 3, connected to the vehicle chassis 15 component, such as here a strut 14.
• This position Pl of the sensor has the advantage that it is close to the measurement targets and enables dynamic measurement.
• measuring profiles are shown as amplitudes AMP over a distance d, wherein with reference numeral M Dl a measuring profile resulting from the distance Dl between the sensor 4 and the measuring target 5 at the flank of the tire 2 at the normal condition of the tire 2 is indicated by the reference M dl the distance Dl 'between the sensor 4 and the measurement target 5 with less filling of the tire 2 resulting measurement profile, with reference M D3 a distance D3 between the sensor 4 and the driving surface 7 at standard condition of the tire 2 resulting measurement profile and with reference M D3' a the distance D3 'between the sensor 4 and the driving surface 7 in the case of a reduced filling of the tire 2 resulting measuring profile is shown in principle.
• the displacement of the measurement profile M Dl to M Dl 'or M D3 to M D3' clearly indicates a tire deformation, wherein from the tire deformation by a suitable algorithm, which is based on a dynamic detection of the displacement of the measurement profiles, the state of reduced filling of the tire 2 is detectable.
• a sensor 4 embodied as a radar sensor, which sensor detects both the distance to the measuring target 5 on the tire and to the driving surface 7. averages and outputs a speed component of the considered area of the flank of the tire 2 to the evaluation 8, with knowledge of the geometries and a corresponding assignment in dependence of fixed range cells, the larger maximum with the curve of the measurement profile M Dl or M_D1 'of the measurement of the distance to the measurement target 5 on the tire 2 and the smaller maximum with the curve of the measurement profile M D3 or M D3 'the measurement of the distance to the driving surface 7 are assigned.
• the amplitudes AMP are first recorded in a first function F1 over the distances according to the measurement profiles of FIG.
• the maxima and minima of the measurement profiles are determined, and in a further function F3 it is checked whether the results or measurement profiles, as in the present example, the measurement profiles M Dl 'and M_D3' associated with stored in a memory unit Standard values or standard measurement profiles, namely in this case the measurement profiles M Dl or M D3, are congruent.
• the signals are evaluated for the respective maxima in a further function F4, in which case a comparison of the maxima with norm values or empirical values, which may be static and dynamic values for the normal state, follows in a subsequent function F5.
• a dynamic adaptation of the standard values can be carried out.
• a further function F7 it is checked whether the standard values with respect to the distance D1 to the measurement target 5 at the flank of the tire 2 and the distance D3 to the driving surface 7 are met. If this is determined in the distinguishing function F7, it is output in a subsequent function F8 that the results or measuring profiles can be used by an algorithm of a control device of the motor vehicle.
• a selection of the values takes place in a subsequent differentiation function F9 as to whether these can be used or whether the signals can no longer be used.
• the system is branched to the appropriate function FlO for use provision. If the deviations are greater than a predefined threshold and are thus defined as unusable, a subsequent function F14 indicates that the signal can not be used.
• a system emergency is started in a subsequent function F15, which information to the function FlO for the use of the measurement profiles through the network of the vehicle and the control algorithms of the connected control / regulating systems is output.
• a discrimination function F12 is used to check whether a detected deviation of a measurement profile from standard values is evaluable or not plausible. If the detected deviations are outside a defined plausibility range, a subsequent function F13 indicates that a possible sensor defect exists and branches to the function F14, which outputs that the signal can not be used, whereupon a system emergency is started according to the function F15 and this information is output to the function FlO for using the measurement profiles by the connected controller algorithms in the vehicle.
• a present change or measurement profile deviation can be evaluated, in a subsequent function F16 the information that a tire defect exists can be obtained. be generated and output to the function FlO to use the information by the control / regulating systems of the vehicle.
• a subsequent function F19 for example, in the case of a dynamic measurement by the sensor 4, the latter may output the information that dynamic changes in the driving state, such as acceleration, deceleration and cornering, are present.
• the calculation of the wheel torques can be started in a function F20, wherein the statements about dynamic changes of the driving state of the function Fl 9 and the wheel torques of the function F20 in a subsequent function F21, which contains a control algorithm for setting the driving represents speed can be processed.
• the speed control is based on qualitative signals and secure information.
• the relevant evaluation device or control device can assign the present information as state data of the tire to a defined state and output this state as a signal.
• Condition Z6 indicates a non-legal use of tires or rims and as condition Z7 a rim condition exemplified.
• a self-calibration of the sensor by reference to the rim can be requested as a reaction of the function F18.
• measures assigned to the respective state are initiated in a subsequent function F23, such as an emergency program, the activation of visual and / or audible and / or haptic warning signals, an automatic speed limit, a change in the braking characteristic, a change in the Engine characteristic or adaptation of acceleration conditions to the road surface.
• a subsequent function F23 such as an emergency program, the activation of visual and / or audible and / or haptic warning signals, an automatic speed limit, a change in the braking characteristic, a change in the Engine characteristic or adaptation of acceleration conditions to the road surface.
• a selection of hypotheses and a classification of the measures into categories takes place in a further function F24, whereby, for example, a prioritization of individual measures can be defined.

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• 2005
  • 2005-03-14 DE DE102005011577A patent/DE102005011577A1/de not_active Withdrawn
• 2006
  • 2006-01-26 US US10/591,072 patent/US20080238644A1/en not_active Abandoned
  • 2006-01-26 JP JP2008501257A patent/JP2008532845A/ja active Pending
  • 2006-01-26 WO PCT/EP2006/050476 patent/WO2006097384A1/de not_active Application Discontinuation
  • 2006-01-26 EP EP06707861A patent/EP1861267A1/de not_active Withdrawn

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