WO2008034414A1 - Verfahren zum bestimmen des druckes in einem pneumatischen fahrzeugreifen - Google Patents
Verfahren zum bestimmen des druckes in einem pneumatischen fahrzeugreifen Download PDFInfo
- Publication number
- WO2008034414A1 WO2008034414A1 PCT/DE2007/001649 DE2007001649W WO2008034414A1 WO 2008034414 A1 WO2008034414 A1 WO 2008034414A1 DE 2007001649 W DE2007001649 W DE 2007001649W WO 2008034414 A1 WO2008034414 A1 WO 2008034414A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tire
- forces
- pressure
- vehicle
- determining
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
- G01L17/005—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies using a sensor contacting the exterior surface, e.g. for measuring deformation
Definitions
- the invention relates to a method for determining the pressure in a pneumatic vehicle tire mounted on a vehicle.
- the force distribution of a tire on the road is essentially determined by the tire pressure, the tire geometry, the load and the profile of the tire.
- the stiffness as well as the shaping of the tire, the transition from the bearing surface to the tire sidewall, creates a strong supporting effect on the outer edges of the tire under high load or low tire pressure.
- these strong forces of the tire sidewalls produce parallel power tongues.
- internal forces of the tire such as the support force of the tire sidewalls and bending forces of the tire surface, also act on entering or leaving the flat bearing surface. These bending forces are also referred to as Latsch bin.
- the latsch effect depends largely on the structure of the tire, the speed, the tire pressure and the tire load. The determination of the latent effect thus provides information about the tire, its load condition as well as the internal friction and rolling resistance of the tire.
- the stiffness of the tire sidewalls creates a strong supporting effect on the side of the support surface. This supporting effect decreases with increasing tire pressure. At lower tire pressure, however, it increases sharply and generated by the bending of the tread transverse to the direction of travel a parallel line of force low contact force.
- the forces that the tire brings to the road are to be regarded as 3-dimensional force profiles, z. B.
- X direction of travel
- Y transverse direction
- Z force.
- the tread pattern distributes the resulting forces only to the surfaces lying on it. The grooves do not transmit power to the road. This can result in high punctual surface pressures.
- Advantageous embodiments are the subject of the dependent claims.
- a method of determining the pressure in a pneumatic vehicle tire mounted on a vehicle comprises the steps of:
- the circumferential center area is the area of the tire, which is mainly determined by the air pressure in the tire and not by internal forces of the tire. Typically this is the center area of the support surface. Only the central region of the support surface has so few inner tire forces that this surface is mainly determined by the tire pressure and thus provides the important information for the invention.
- the correct tire pressure it is possible to estimate the correct tire pressure or to determine whether the correct tire pressure prevails by forcing and interpreting the force profile transversely to the direction of travel.
- the ideal tire pressure prevails when the tire support surface brings the load of the vehicle as evenly as possible on the road. If there is a spherical force distribution, the tire pressure is too high. Too low a tire pressure can be recognized by the high flank support force and the parallel running force throat as well as high Latency effects. Such latent or Walk bine are recognizable at the front and rear peaks of the force signal in the direction of travel at low tire pressure. They are responsible for the internal friction and thus for the heating of the tire. From this information can be obtained, which allows an objective evaluation of the correct tire pressure as a pressure range and not only as a fixed number.
- the determination of the Latsch bines takes place by comparing the measured force profile with a pre-stored force profile that would have arisen without Latsch bin, or on a symmetry consideration of the force profile.
- the invention provides for measuring the entire area of the support surface, but evaluating different areas according to different criteria or with respect to specific parameters and forces. It is provided that is determined in the circumferential center of the vehicle tire, since there only minimal disturbing forces act by internal forces of the tire. The remaining influence of the profile can be eliminated by averaging several measured values.
- the four side regions adjacent to the center region provide additional parameters of the inner tire forces.
- Tire flank forces for example, can be determined from the transverse force profile, as well as flank throat forces, while flexing forces result, for example, from the longitudinal force profile.
- the parameters of all tires can be evaluated, for example, for the tire pressures of all tires of a vehicle can be specified whether they are within a permissible pressure range. Then, a singular information may be displayed, for example by a traffic light indicating "all tires in order", "one or more tires out of order” or a similarly worded statement.
- the optimal tire pressure is reached when the force profile transversely to the direction of travel shows a uniform force distribution as possible. If high forces of the tire flank occur at the edges, paired with force indentations that lie laterally from the inside, the tire sidewall is too curved and the pressure is too low.
- Figure 1 shows the typical force curve of a tire in the direction of travel
- Figure 2 shows the typical force curve of a tire transverse to the direction of travel
- Figure 3 is a schematic representation for determining the axis camber from the data of the tires.
- the typical force curve of the tire is considered both in the direction of travel and transversely to the direction of travel.
- the correct tire pressure is characterized by the fact that the distribution of forces is flat, whereas if the tire pressure is too high there is a crowned distribution of forces, high flank forces occur if the tire pressure is too low.
- a strong slippery effect can also be an indication of high tire load caused by high load or low pressure.
- a Laces effect is characterized by the fact that there is an overshoot in the curve in the direction of travel at the transition from the slope to the plateau. The effect is caused by the buckling of the tread and possibly the flanks and the restoring force generated thereby. Since the tire material is rubber, it creates an elastic and a plastic force component.
- the elastic component results in elevations on the slopes and downs, as well as at the beginning and end of the plateau, while the plastic component on the slope and at the beginning of the plateau leads to force amplification, at the end of the plateau and on the back drop to force reduction.
- the Laces effect is then manifested by a curve view, in which the front and rear edges and corners of the longitudinal profile are compared with a symmetrical trapezoidal profile.
- a similar behavior shows the force curve of a tire transversely to the direction of travel, as shown in Figure 2. It makes sense to consider the force profile longitudinally and transversely as a surface. From the profiles longitudinally and transversely different parameters can be determined.
- the tire pressure itself can then be determined by converting the measured forces which are not modified by the influences of the tire sidewalls and by the luffing effect, ie those in the circumferential center region of the tire, into partial pressures, the force being divided by the measuring surface.
- the Querproeuropa of the tire it is advantageous if the Querproeuropa of the tire as possible shows a consistently high pressure.
- the array of load sensors may be a sensor array or a sensor array. From the data of the tires further important facts can be determined. This is for example the fall of the axle or the tires.
- the camber describes the angle around the direction of travel of the tire to its axis. It is predetermined by the design, but may vary due to damage, resulting in poor handling characteristics as well as increased energy consumption and tire wear.
- the fall is reflected in the measured data in that, as shown in Figure 3, the bearing surfaces of the tire is not square, but tapers conically to the side. From the conicity can be derived how strong the fall is, it can then be checked against tolerances.
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112007002832T DE112007002832A5 (de) | 2006-09-19 | 2007-09-14 | Verfahren zum Bestimmen des Druckes in einem pneumatischen Fahrzeugreifen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006044586.4 | 2006-09-19 | ||
DE102006044586 | 2006-09-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008034414A1 true WO2008034414A1 (de) | 2008-03-27 |
Family
ID=38754630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2007/001649 WO2008034414A1 (de) | 2006-09-19 | 2007-09-14 | Verfahren zum bestimmen des druckes in einem pneumatischen fahrzeugreifen |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112007002832A5 (de) |
WO (1) | WO2008034414A1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010145830A1 (de) | 2009-06-17 | 2010-12-23 | Lufthansa Technik Ag | Anordnung zum bestimmen des druckes in einem fahrwerksreifen eines luftfahrzeugs |
GB2529443A (en) * | 2014-08-20 | 2016-02-24 | Jaguar Land Rover Ltd | Object detection apparatus and method |
DE102009057577B4 (de) * | 2009-12-09 | 2020-01-16 | Continental Automotive Gmbh | Positionsbestimmung für einzelne Reifen eines Mehrfachreifens |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0656269A1 (de) * | 1993-12-02 | 1995-06-07 | Exxon Research And Engineering Company | Reifendruckfühler |
DE20200489U1 (de) * | 2002-01-10 | 2002-05-29 | VELOMAT Messelektronik GmbH, 01917 Kamenz | Vorrichtung zur Bestimmung des Reifeninnendrucks |
US20060123897A1 (en) * | 2002-12-20 | 2006-06-15 | Carlo Monguzzi | Properties of a tire with sensor signals of speed of deformation |
-
2007
- 2007-09-14 DE DE112007002832T patent/DE112007002832A5/de not_active Withdrawn
- 2007-09-14 WO PCT/DE2007/001649 patent/WO2008034414A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0656269A1 (de) * | 1993-12-02 | 1995-06-07 | Exxon Research And Engineering Company | Reifendruckfühler |
DE20200489U1 (de) * | 2002-01-10 | 2002-05-29 | VELOMAT Messelektronik GmbH, 01917 Kamenz | Vorrichtung zur Bestimmung des Reifeninnendrucks |
US20060123897A1 (en) * | 2002-12-20 | 2006-06-15 | Carlo Monguzzi | Properties of a tire with sensor signals of speed of deformation |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010145830A1 (de) | 2009-06-17 | 2010-12-23 | Lufthansa Technik Ag | Anordnung zum bestimmen des druckes in einem fahrwerksreifen eines luftfahrzeugs |
DE102009025245A1 (de) | 2009-06-17 | 2010-12-30 | Lufthansa Technik Ag | Anordnung zum Bestimmen des Druckes in einem Fahrwerksreifen eines Luftfahrzeugs |
US8375781B2 (en) | 2009-06-17 | 2013-02-19 | Lufthansa Technik Ag | Arrangement for determining the pressure in an undercarriage tyre of an aircraft |
DE102009057577B4 (de) * | 2009-12-09 | 2020-01-16 | Continental Automotive Gmbh | Positionsbestimmung für einzelne Reifen eines Mehrfachreifens |
GB2529443A (en) * | 2014-08-20 | 2016-02-24 | Jaguar Land Rover Ltd | Object detection apparatus and method |
GB2529443B (en) * | 2014-08-20 | 2018-05-30 | Jaguar Land Rover Ltd | Object detection apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
DE112007002832A5 (de) | 2009-09-03 |
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