WO2003078182A1 - System zur überwachung der reifenzustands - Google Patents
System zur überwachung der reifenzustands Download PDFInfo
- Publication number
- WO2003078182A1 WO2003078182A1 PCT/DE2003/000797 DE0300797W WO03078182A1 WO 2003078182 A1 WO2003078182 A1 WO 2003078182A1 DE 0300797 W DE0300797 W DE 0300797W WO 03078182 A1 WO03078182 A1 WO 03078182A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drive
- monitoring
- wheels
- torques
- drive torques
- 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.)
- Ceased
Links
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
- B60C23/061—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 wheel speed
Definitions
- the invention relates to a system for monitoring the tire condition according to the preamble of claim 1.
- DE 36 30 116 A and DE 32 36 520 C describe a device for displaying the condition of the tires of a vehicle, in which the differences in the rotational speeds of individual wheels under certain operating conditions (unbraked, unaccelerated straight-ahead driving) are determined. In particular, it is proposed to normalize these rotational speeds to the respective vehicle speed.
- DE 41 13 278 A describes a tire tolerance adjustment in which ratios of the rotational speeds of wheels on each because one side of the vehicle is formed and correction values for comparison are derived from it.
- the object of the present invention is to optimize the tire condition detection.
- the invention is based on a method or a device for monitoring the tire condition on the driven wheels of a motor vehicle.
- the rotary movements of the driven wheels are recorded and quantities which are dependent on the recorded rotary movements are generated.
- the quantities generated are linked to one another. Monitoring then takes place depending on the link result.
- the essence of the invention is that the drive torque acting on the drive wheels continues to be included in the monitoring.
- the background of the invention is that, in the case of different types of tires, the rolling circumference changes so much differently as a function of the drive torque that a change in the rolling circumference caused by pressure loss can be compensated for and therefore not recognized. For the same reason, mispricing of pressure drops can also occur. If, according to the invention, the influence of the drive torque is now taken into account in the tire pressure loss detection, pressure loss can also be detected reliably and without error detections in such cases.
- a signal which represents the tire condition is generated as a function of the link result and as a function of the drive torque acting on the drive wheels.
- display means are provided which indicate the tire condition in response to the signal from the evaluation means.
- at least two linkage results are recorded with at least two different drive torques and the change in the linkage results in relation to these drive torques is included in the monitoring.
- At least two linkage results are recorded for at least two different drive torques and the change in the linkage results in relation to these drive torques is included in the generation of the signal for display.
- the change in the linking results with respect to the drive torques is compared with at least one threshold value. Monitoring then takes place as a function of the comparison result and / or the signal is generated as a function of the comparison result.
- the monitoring according to the invention is not used during all operating states.
- the drive torque acting on the drive wheels can only be included in the monitoring when lower drive torques are present, in particular when drive torques are below a threshold value. It is particularly provided that
- the drive torque acting on the drive wheels is included in the monitoring and - in the presence of higher drive torques, in particular in the presence of drive torques above a threshold value, the monitoring is independent of that acting on the drive wheels Driving torque happens.
- the monitoring in an all-wheel drive vehicle can advantageously be driven.
- the wheel speeds numbers of non-driven wheels are taken into account in the monitoring.
- An operation of the all-wheel-drive vehicle is conceivable, for example, in which an additional axle drive is only activated when required.
- the recorded wheel speeds are linked to different linking results. For example, redundant monitoring can be carried out if one linking result provides an axle-wise and another linking result a diagonal linking of the wheel speeds.
- the control of the differential lock present in the vehicle can be included in the monitoring.
- FIG. 1 shows a block diagram of the system according to the invention.
- FIGS. 2, 3, 4 and 5 represent dependencies of a wheel speed difference on the drive torque.
- FIG. 6 describes the exemplary embodiment using a flow chart.
- the wheel speeds Vij are fed to the ABS and / or ASR and / or ESP module 20, the module 20 being designed as a known anti-lock braking system and / or traction control system and / or driving stabilization system, by means of which variables from the wheel speeds are known in a known manner (For example, wheel slip and / or wheel deceleration) are formed in order to bring the tendency to lock and / or the wheel to spin and / or for example a yaw behavior of the vehicle to a desired level.
- a known anti-lock braking system and / or traction control system and / or driving stabilization system by means of which variables from the wheel speeds are known in a known manner (For example, wheel slip and / or wheel deceleration) are formed in order to bring the tendency to lock and / or the wheel to spin and / or for example a yaw behavior of the vehicle to a desired level.
- the wheel speed signals Vij can be supplied to units 30 for tire tolerance adjustment. Correction values for correcting the
- Wheel speed signals determined. This happens because different tire diameters of the wheels can simulate different slip sizes and thus deteriorate the ABS and / or ASR and / or ESP regulation.
- the wheel speeds are compared with one another in a known manner in certain operating states (no slippage, for example, unbraked, unaccelerated driving straight ahead) and from the
- Deviations derived the correction values can then be stored in a memory 50.
- Essential for the present invention is the unit 40 for recognizing the tire status, to which the wheel speeds Vij are also supplied. If a tire defect, for example a loss of tire pressure, is determined, a signal device SO is activated by the signal S from the unit 40. In the simplest case, this display device 80 can be a warning lamp which merely indicates whether a tire defect has been detected or not. In this case the signal S only has to take two values. In addition, the display device 80 can be designed such that it is indicated which tire has the defect.
- the unit 40 is supplied by the motor control 90 with the wheel torque Mrad currently acting on the drive wheels.
- This wheel torque can be caused, for example, by that present in modern engine control devices
- Engine output torque taking into account the gear ratio and, if necessary, under Considering a converter and other units located in the driveline between the engine and the wheels.
- Known tire pressure monitoring systems are generally not connected or networked in the vehicle to other systems that control or regulate driving functions. In such systems mentioned at the outset, only the wheel speed sensors are used. A tire pressure loss is recognized if the wheel with a pressure loss deviates for a long time
- Differences in the wheel speeds are generally integrated in the evaluation algorithm, the differences usually being formed axially. As soon as one of the differences exceeds a predefinable or parameterizable threshold, a pressure loss is recognized. This can be seen in FIG. 2.
- V vl _ vr (Vvl - Vvr) / V Fz
- Vp z plotted as a function of the wheel torque Mrad acting on the drive wheels.
- the front wheels are driven.
- Vj> V r should be, i.e. a pressure loss in the front left tire. If there is a pressure loss in the front right tire, this results in comparison with the Figures 2, 3, 4 and 5 mirror images.
- the tires on the drive axle of the vehicle are of the same type. This means that the wheel torque-dependent deformation of the tires also takes place in the same way. The dependency shown in FIG. 2 is thus reached.
- the area 2B are the values that correspond to the nominal tire pressure.
- the values which indicate a pressure loss are in the regions 2A.
- Values indicate a loss of tire pressure, labeled 3A, while the values in the area 3C represent the nominal pressure area.
- EEPROM electronic erasable programmable read only memory
- the pressure loss detection thresholds (to the areas 2A, 5C in FIGS. 2 and 5) are provided with a safety distance above the target state. If a greater difference in the wheel speeds then occurs in the detection phase, which is indicated by the distance ⁇ V v
- the "bands" in Figures 2, 3, 4 and 5 represent envelopes of measured values.
- the previous evaluation algorithm shown on the basis of FIG. 2 can also be used reliably for the drive axle.
- detection with the previous algorithm, in which a fixed detection threshold is used, is not possible.
- Figures 3, 4 and 5 differ significantly from the area 2A ( Figure 2, similar tires).
- the rolling circumference is independent of air pressure. This means that with drive torques Mrad in this area 3B, a pressure loss cannot be detected in the conventional manner described.
- Detection thresholds can be combined with the detection according to the invention (FIG. 4, detection by gradient evaluation). In the area of smaller wheel torques, the detection threshold is quickly exceeded in the event of pressure loss. The previous detection (area 5C) is effective here.
- pressure loss can then be recognized from the gradient calculation 5B (detection via the described new method). With the additional drive torque information, a pressure loss can thus be reliably detected even with driven wheels.
- FIG. 6 shows an example of a sequence of the embodiment according to FIG. 5.
- step 52 the difference ⁇ V v ⁇ _ vr is calculated from the wheel speeds Vvl, Vvr of the driven wheels according to the formula described above.
- the current wheel torque Mrad is also read in.
- step 53 the wheel torque Mrad is compared with a first threshold value SW1.
- step 56 the signal S is generated which indicates a loss of tire pressure.
- the amount of the difference exceeds ⁇ V vj . If the value is not SW3, there is no detectable loss of air pressure and the process goes directly to the final step 58.
- the gradient ST ⁇ V is formed in step 54.
- the gradient ST ⁇ V represents the change in the ⁇ V v j_ vr dependent on the wheel torque. In the simplest case, two difference values ⁇ V v] are used for this. vr , which have been recorded at different wheel torques, are subtracted from each other and divided by the difference of the respective wheel torques. The slope of straight line 5B shown in FIG. 5 is thus obtained.
- the magnitude of the gradient ST ⁇ V is compared with a threshold value SW2.
- step 56 the signal S is generated which indicates a loss of tire pressure. If the magnitude of the gradient ST ⁇ V does not exceed the value SW2, there is no loss of air pressure and the process proceeds directly to the final step 58.
- vij in accordance with the detected wheel speed signals
- tire condition variables Two different linking results are determined for tire condition variables, which are determined on the basis of the axle speed ( ⁇ v A ) as well as on the diagonal ( ⁇ v D ) based on the wheel speed variables V R , v V , VV R , and V VL standardized to the vehicle speed v car .
- These two tire condition variables are initially calibrated at nominal pressure and serve as reference setpoints for the following monitoring. Then the actual state (current wheel speed difference) is compared with the target state. As soon as setpoints and actual values differ by a parameterizable amount, pressure loss is recognized and, if necessary, communicated to the driver acoustically and / or optically.
- the drive torque distribution on the wheels can be included in the monitoring as a further variable.
- coupling the wheels with each other both axially and longitudinally by means of a differential lock as is the case, for example, with all-wheel drive vehicles
- this information can be used to determine the drive torque distribution. Based on this drive torque distribution, theoretical values of individual wheel speeds and thus the tire condition variables ⁇ v Alt eor ud ⁇ v D
- the tire condition variables .DELTA.v A and .DELTA.v D which are based on the real wheel speeds, can then be compared with the theoretical values .DELTA.V A ⁇ theor and .DELTA.v D , t eor . As soon as a difference between the two different data sets exceeds a parameterizable threshold value, a pressure loss in a tire is recognized.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03744309A EP1487649A1 (de) | 2002-03-16 | 2003-03-13 | System zur berwachung der reifenzustands |
| US10/507,668 US20050268706A1 (en) | 2002-03-16 | 2003-03-13 | System for monitoring the state of a tyre |
| JP2003576209A JP2005520726A (ja) | 2002-03-16 | 2003-03-13 | 自動車の駆動車輪におけるタイヤ状態のモニタ装置 |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10211697 | 2002-03-16 | ||
| DE10211697.0 | 2002-03-16 | ||
| DE10303492A DE10303492A1 (de) | 2002-03-16 | 2003-01-30 | System zur Überwachung des Reifenzustands |
| DE10303492.7 | 2003-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003078182A1 true WO2003078182A1 (de) | 2003-09-25 |
Family
ID=28042839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2003/000797 Ceased WO2003078182A1 (de) | 2002-03-16 | 2003-03-13 | System zur überwachung der reifenzustands |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20050268706A1 (de) |
| EP (1) | EP1487649A1 (de) |
| JP (1) | JP2005520726A (de) |
| WO (1) | WO2003078182A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110758027A (zh) * | 2019-10-17 | 2020-02-07 | 江苏徐工工程机械研究院有限公司 | 液力传动轮式工程机械胎压监测预警方法 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008038579A1 (de) | 2007-09-03 | 2009-03-05 | Continental Teves Ag & Co. Ohg | Verfahren zur indirekten Reifendrucküberwachung und Reifendrucküberwachungssystem |
| JP6337528B2 (ja) * | 2014-03-10 | 2018-06-06 | 村田機械株式会社 | 走行車輪の劣化検出方法と検出システム、及び走行台車 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3630116A1 (de) | 1986-09-04 | 1988-03-17 | Bosch Gmbh Robert | Mit einem antiblockierregelsystem ausgeruestetes fahrzeug |
| DE3236520C2 (de) | 1982-10-02 | 1991-02-28 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
| EP0291217B1 (de) | 1987-05-13 | 1991-05-22 | Sp Tyres Uk Limited | Verfahren zur Feststellung eines leeren Reifens auf einem Fahrzeug |
| DE4113278A1 (de) | 1991-04-24 | 1992-10-29 | Bosch Gmbh Robert | Schlupfregelanlage |
| EP0768193A1 (de) * | 1995-10-11 | 1997-04-16 | Honda Giken Kogyo Kabushiki Kaisha | System zur Bestimmung von Reifendruckverminderung in Reifen von Kraftfahrzeugen |
| DE10058097A1 (de) * | 2000-02-02 | 2001-08-23 | Continental Teves Ag & Co Ohg | Verfahren und Vorrichtung zur Erkennung eines Reifendruckverlusts durch Auswertung von Referenzgrößen und dessen Verwendung |
-
2003
- 2003-03-13 EP EP03744309A patent/EP1487649A1/de not_active Withdrawn
- 2003-03-13 WO PCT/DE2003/000797 patent/WO2003078182A1/de not_active Ceased
- 2003-03-13 US US10/507,668 patent/US20050268706A1/en not_active Abandoned
- 2003-03-13 JP JP2003576209A patent/JP2005520726A/ja not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3236520C2 (de) | 1982-10-02 | 1991-02-28 | Robert Bosch Gmbh, 7000 Stuttgart, De | |
| DE3630116A1 (de) | 1986-09-04 | 1988-03-17 | Bosch Gmbh Robert | Mit einem antiblockierregelsystem ausgeruestetes fahrzeug |
| EP0291217B1 (de) | 1987-05-13 | 1991-05-22 | Sp Tyres Uk Limited | Verfahren zur Feststellung eines leeren Reifens auf einem Fahrzeug |
| DE4113278A1 (de) | 1991-04-24 | 1992-10-29 | Bosch Gmbh Robert | Schlupfregelanlage |
| EP0768193A1 (de) * | 1995-10-11 | 1997-04-16 | Honda Giken Kogyo Kabushiki Kaisha | System zur Bestimmung von Reifendruckverminderung in Reifen von Kraftfahrzeugen |
| DE10058097A1 (de) * | 2000-02-02 | 2001-08-23 | Continental Teves Ag & Co Ohg | Verfahren und Vorrichtung zur Erkennung eines Reifendruckverlusts durch Auswertung von Referenzgrößen und dessen Verwendung |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110758027A (zh) * | 2019-10-17 | 2020-02-07 | 江苏徐工工程机械研究院有限公司 | 液力传动轮式工程机械胎压监测预警方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005520726A (ja) | 2005-07-14 |
| EP1487649A1 (de) | 2004-12-22 |
| US20050268706A1 (en) | 2005-12-08 |
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