WO2000059744A1 - Method and device for identifying a drop in pressure and for controlling dynamics of vehicle movement - Google Patents
Method and device for identifying a drop in pressure and for controlling dynamics of vehicle movement Download PDFInfo
- Publication number
- WO2000059744A1 WO2000059744A1 PCT/EP2000/002741 EP0002741W WO0059744A1 WO 2000059744 A1 WO2000059744 A1 WO 2000059744A1 EP 0002741 W EP0002741 W EP 0002741W WO 0059744 A1 WO0059744 A1 WO 0059744A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pressure loss
- driving dynamics
- wheel
- variable
- loss detection
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims description 53
- 230000004048 modification Effects 0.000 claims description 23
- 238000012986 modification Methods 0.000 claims description 23
- 230000001133 acceleration Effects 0.000 claims description 18
- 238000012360 testing method Methods 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 5
- 230000015654 memory Effects 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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 method and a device for pressure loss detection and for driving dynamics control.
- one or more test variables are determined with reference to a wide variety of signals, including sensor signals and intermediate values from other vehicle components, if necessary, which e.g. can be compared with threshold values in order to draw conclusions about pressure conditions in the tires of the vehicle.
- the pressure loss detection can be carried out individually for each wheel or as a blanket across several or all wheels of the vehicle (e.g. forming the quotient of the sum of the wheel speeds on the diagonals and comparing the quotient with thresholds).
- tire pressure loss detections are usually based on a comparison between vehicle speed (e.g. vehicle reference speed) and angular speeds (sensor-detectable) of the individual wheels.
- vehicle speed e.g. vehicle reference speed
- angular speeds sensor-detectable
- the tire pressure loss detection is influenced by numerous disturbance variables, for example by different running speeds of wheels when cornering (see, for example, FIG. 3: the wheels 31, 34 of the vehicle 30 on the outer curve drive approximately on the radius Ra, while the wheels 32, 33 on the smaller one Drive radius Ri so that you have to cover a shorter distance and therefore fewer revolutions at the same time).
- errors can be systematically compensated for by selecting the detection algorithm or by using learned correction value tables. At the same time, this is not sufficient, particularly in the case of highly dynamic driving maneuvers, to avoid error detection with sufficient certainty.
- the tire pressure conditions also influence the quality of vehicle dynamics controls such as the anti-lock braking system, electronic stability control and traction control.
- the object of the invention is to provide a method and a device for pressure loss detection and for driving dynamics control, which take into account the interactions between tire pressure and driving dynamics, in particular during driving maneuvers with high driving dynamics.
- Pressure loss detection operates as a function of at least one driving dynamics variable. If the driving dynamics variable meets certain conditions, the pressure loss detection can be influenced according to predetermined patterns. For this purpose, predetermined correction values or correction algorithms can be used. In this context, predetermined means that these are not values learned during vehicle operation, but rather correction values or correction strategies that are available from the beginning. These can be used in particular for driving maneuvers with high driving dynamics, for example if the longitudinal acceleration is> 0.1 g, more preferably> 0.2 g and / or if the lateral acceleration is> 0.2 g or> 0.3 g and / or if the wheel slip on at least one wheel is> 4%, more preferably> 6% (traction slip and brake slip).
- One or more of the following variables can be used as driving dynamics variables: the vehicle speed, for example the vehicle reference speed, as determined by certain algorithms from the wheel speeds, the longitudinal acceleration, which was either calculated from the vehicle reference speed or determined by sensors, the yaw rate (angular speed around the vertical axis), either recorded or calculated by sensors, the lateral acceleration (recorded or calculated by sensors), the steering wheel angle, generally a curve parameter (e.g. calculated curve radius), a wheel acceleration, in particular a wheel angle acceleration, as can be derived, for example, from the wheel signals from the wheel sensors, the wheel slip (difference between wheel (ahnJ speed and vehicle reference speed), the wheel slip gradient (derivation of the wheel slip, wheel slip acceleration), the tire sidewall torsion, for example detected.
- the vehicle speed for example the vehicle reference speed, as determined by certain algorithms from the wheel speeds
- the longitudinal acceleration which was either calculated from the vehicle reference speed or determined by sensors
- the yaw rate angular speed around the vertical axis
- the lateral acceleration
- One or more of the above variables can be checked for the presence of certain conditions with regard to their values and possibly also with regard to their time course. If these conditions exist (value condition and possibly additional time condition), the pressure loss detection can be modified.
- a driving dynamics control according to the invention also takes place as a function of determined tire pressure conditions.
- the tire pressure ratios can influence the setpoint, the response thresholds or the control strategy selection.
- target pressure values In general, in the event of pressure loss, lower target pressure values, target pressure gradients, wheel slip values or drive torques can be specified or adjusted as target values.
- the pressure loss detection for influencing the driving dynamics control can take place as described above.
- FIG. 1 shows an embodiment of the pressure loss detection according to the invention
- FIG. 2 shows a more detailed embodiment of FIG. 1
- FIG. 3 explains the disturbance variables
- FIG. 4 shows the driving dynamics control according to the invention
- FIG. 5 shows a combined system of driving dynamics control and pressure loss detection.
- the pressure loss detection 11 receives input signals 13 and outputs output signals 15.
- the input signals 13 can include sensor signals, intermediate variables from other vehicle components and other data.
- the output signals 15 may include warning signals, control signals for other device components and information signals regarding tire pressure.
- a test size PG can be determined as follows:
- PG ((wvi + whr) / (wvr + whl)), where wvl denotes the front left wheel speed, wvr the front right wheel speed, the rear right wheel speed and the left rear wheel speed.
- wvl denotes the front left wheel speed
- wvr the front right wheel speed
- the rear right wheel speed the left rear wheel speed.
- the test variable PG is compared with threshold values, and in the event that the pressure is exceeded or undershot, a pressure loss is recognized and suitable signals are output.
- the 12 is a modifier that receives input signals 14 that reflect one or more driving dynamics. It in turn generates signals with which the pressure loss detection 11 can be influenced.
- the pressure loss detection can be influenced in various ways. This is shown in more detail in Fig. 2.
- the detection device 11 has a detection part 21 with a determination device 22, which determines a test variable, for example as stated above, and a checking device 25, which checks the test variable using threshold values, symbolized by 26. If certain conditions exist, one or more signals are output.
- the modification device 12 can act on the detection in various ways: it can, for example, modify the input signals when there are pressure losses. This is symbolized by changeover switches 23b, 23c and modification devices 24b, 24c, which are operated or set and set in accordance with the modification device 12.
- the modification device 12 can also influence or change the algorithm used in the determination device 22. For example, if there is traction slip, the test size can no longer be determined with reference to the driven wheels or other values (for example the non-driven wheels) can be used for these.
- test variable itself as determined by the determination device 22, can also be modified, indicated by changeover switch 23a and modification device 24a, which are actuated in accordance with the modification device 12. Finally, it is also possible to completely prevent the tire pressure check, indicated by interrupting the output by means of switch 20, which is also operated in accordance with the modification device 12.
- a logic 29 is located in the modification device 12, which receives the vehicle dynamics data 14a-14d and generates suitable control signals for influencing the pressure loss detection in accordance with one or more vehicle dynamics variables.
- a memory 28 can also be provided in the modification device 12, which can contain tables for correction values, for example, the tables being accessed in accordance with a driving dynamics variable and the value read out being used to correct an input signal 13a, 13b or to correct the test variable.
- the correction value can additive or multiplicative or as a substitute value. In this way, input variables 13a, 13b, intermediate variables such as the test variable PG, or also threshold values can be changed, corrected or replaced.
- the design of the pressure loss detection can also be such that process steps corresponding to a modification are carried out permanently (with and without pressure loss), but that the modification is neutral in the event that there is no pressure loss (e.g. multiplication by 1, addition of 0). This has the advantage that in the event of a loss of pressure, it is not necessary to change an appropriate algorithm, but only the size used for the correction.
- the determination device 22 can also generate data signals, for example data which represent the wheel diameter differences of the individual wheels. These data can also be modified according to the driving dynamics and output if necessary.
- a sidewall torsion sensor on wheel tires delivers a signal that is particularly favorable for the present purposes. Acceleration and braking processes as well as lateral forces result in the sidewall of a tire being displaced and twisted both in the circumferential direction and in the radial direction, and possibly also in the axial direction of the wheel. This will be particularly the case for tires with a drop in pressure. If the sidewall torsion is sensed, this signal can be used to determine the wheel dynamics and then indirectly to influence the tire pressure detection, or it is used directly for pressure loss detection. used, for example when the torsion exceeds a certain level.
- Learning processes can also take place in the context of the abovementioned direct modification, for example for determining correction values during operation of the vehicle, which are even better adapted than correction values set at the factory.
- memories can be provided which also hold the information written to them in the event that their input voltage is lost.
- the signals with the highest resolution can be selected.
- the required input signals and the generated output signals can be taken from or fed into a data bus, for example a CAN bus.
- the driving dynamics used can be sensor sizes, filtered sensor sizes or pre-evaluated data.
- the 4 shows a driving dynamics control according to the invention. It has at least one controller 41 which receives input signals 43 and outputs output signals 45. Part of the input signals 43 will be measurement signals from the controlled system (wheel sensors, acceleration sensor, lateral acceleration sensor, yaw rate sensor, steering wheel angle sensor or the like.). In addition, other input signals can be received, for example quantities from other processes. Part of the output signals 45 will be control signals for actuators, for example for the wheel brakes, hydraulic pumps, for an engine interface and the like.
- the governor can be a brake control and / or a traction control system and / or an electronic one Act stability regulation. You can work a priori using conventional algorithms.
- the pressure loss detection 42 symbolizes pressure loss detection, which generally identifies the presence of pressure loss in a particular or in any wheel of the vehicle.
- the pressure loss detection 42 can be constructed as described above.
- the pressure loss detector 42 generates signals that modify the operation of the regulator when a pressure loss is detected.
- the modification can relate to the input variables 43, the output variables 45 or parameters or algorithms for processing the input data and for generating the output data.
- a wheel has pressure loss, it is a priori desirable to put less pressure on it in terms of acceleration and braking forces. Accordingly, it may be desirable to control lower braking forces or gradients thereof for such a wheel. The same applies to acceleration forces. In order to achieve this goal, smaller brake pressure values or brake pressure gradients or engine torques or engine torque gradients can be adjusted.
- this modified regulation can relate solely to the known wheel.
- another wheel for example the diagonally opposite one, can also be regulated in a modified manner in a similar manner to compensate for forces.
- all wheels can be regulated modified.
- a vehicle has an automatic clutch or (with all-wheel drive) a center clutch with automatic intervention, these actuators can also be accessed to regulate the driving dynamics.
- clutches or locks in the drive train of the corresponding wheel or the respective axle can be opened or only partially closed, for example. This applies in particular to the case of traction control.
- the driving dynamics control described works integrated with conventional systems.
- the system according to the invention does not act "in competition” with conventional systems. Rather, it is advantageous that the driving dynamics control according to the invention is algorithmically integrated in conventional controls so that it can run in particular together with a conventional control on the same hardware.
- the controller 41 receives, among other things, certain signals 15 from the pressure loss detection 11. These need not be all of the signals output by the pressure loss detection 11.
- the signal strands 13, 14 and 43 shown separately in FIG. 5 can at least partially contain or denote the same signals. Access to a bus on which the necessary data is present, for example cyclically, can also be involved, at least in part.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000609279A JP2002541006A (en) | 1999-04-03 | 2000-03-29 | Method and apparatus for pressure drop detection and travel dynamics control |
EP00926768A EP1169184A1 (en) | 1999-04-03 | 2000-03-29 | Method and device for identifying a drop in pressure and for controlling dynamics of vehicle movement |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19915233 | 1999-04-03 | ||
DE19915231 | 1999-04-03 | ||
DE19915233.0 | 1999-12-21 | ||
DE19915231.4 | 1999-12-21 | ||
DE19961681A DE19961681A1 (en) | 1999-04-03 | 1999-12-21 | Method and device for pressure loss detection and vehicle dynamics control |
DE19961681.7 | 1999-12-21 |
Publications (1)
Publication Number | Publication Date |
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WO2000059744A1 true WO2000059744A1 (en) | 2000-10-12 |
Family
ID=27219071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/002741 WO2000059744A1 (en) | 1999-04-03 | 2000-03-29 | Method and device for identifying a drop in pressure and for controlling dynamics of vehicle movement |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1169184A1 (en) |
JP (1) | JP2002541006A (en) |
WO (1) | WO2000059744A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1240038B1 (en) * | 1999-12-15 | 2003-10-08 | Continental Aktiengesellschaft | Method and device for detecting a pressure loss in the tires of a motor vehicle |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19625544C1 (en) * | 1996-06-26 | 1997-08-28 | Kostal Leopold Gmbh & Co Kg | Motor vehicle tyre pressure variation warning esp for driver of motor vehicle |
US5696681A (en) * | 1995-06-05 | 1997-12-09 | Ford Global Technologies, Inc. | Brake steer vehicle dynamics control intervention |
-
2000
- 2000-03-29 EP EP00926768A patent/EP1169184A1/en not_active Withdrawn
- 2000-03-29 WO PCT/EP2000/002741 patent/WO2000059744A1/en not_active Application Discontinuation
- 2000-03-29 JP JP2000609279A patent/JP2002541006A/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5696681A (en) * | 1995-06-05 | 1997-12-09 | Ford Global Technologies, Inc. | Brake steer vehicle dynamics control intervention |
DE19625544C1 (en) * | 1996-06-26 | 1997-08-28 | Kostal Leopold Gmbh & Co Kg | Motor vehicle tyre pressure variation warning esp for driver of motor vehicle |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1240038B1 (en) * | 1999-12-15 | 2003-10-08 | Continental Aktiengesellschaft | Method and device for detecting a pressure loss in the tires of a motor vehicle |
Also Published As
Publication number | Publication date |
---|---|
JP2002541006A (en) | 2002-12-03 |
EP1169184A1 (en) | 2002-01-09 |
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