EP4042133A1 - Estimation de l'adhérence de roues d'un train d'un véhicule par mesure de résistance - Google Patents
Estimation de l'adhérence de roues d'un train d'un véhicule par mesure de résistanceInfo
- Publication number
- EP4042133A1 EP4042133A1 EP20781052.4A EP20781052A EP4042133A1 EP 4042133 A1 EP4042133 A1 EP 4042133A1 EP 20781052 A EP20781052 A EP 20781052A EP 4042133 A1 EP4042133 A1 EP 4042133A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vehicle
- wheels
- grip
- electrical resistance
- processor
- 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- Withdrawn
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
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
-
- 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
- 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
Definitions
- TITLE ESTIMATE OF THE WHEEL ADHESION OF A VEHICLE TRAIN BY MEASUREMENT OF RESISTANCE
- the invention relates to wheeled land vehicles, and more specifically to the estimation of the grip of the wheels of such vehicles.
- Certain land vehicles generally of the automobile type, comprise a train comprising two wheels each comprising an electrically conductive rim and on which a tire is mounted.
- the rim is also responsible for providing the interface for the transfer of electrostatic charges, which accumulate on the metal structure of its vehicle (and in particular its body), between this structure and the associated wheel.
- the grip of the wheels of a vehicle is an important parameter to know when you want to at least partially control the driving of this vehicle (and in particular its trajectory). For example, this grip is estimated and then used by a trajectory control device dedicated to anti-skidding (generally called ESP (“Electronic Stability Program”) or ESC (“Electronic Stability Control”)) or anti-skidding. slip (generally referred to as ASR ("Acceleration Slip Regulation") or TCS ("Traction Control System"). Usually, the trajectory control device estimates the grip of the wheels of at least one train in order to detect a resulting loss of grip. skidding or skidding.
- the more precise the estimate of the grip of a wheel the more effective the solution determined by the trajectory control device to counteract a loss of grip.
- the more precise the estimate of the grip of a wheel the more precise the estimate of the maximum torque that can be transmitted by this wheel.
- the adhesion of a driving wheel of a vehicle can, for example, be achieved by comparing the current speed of this vehicle with the estimated speed of movement of this driving wheel, itself deduced from the speed of rotation. of the latter.
- This technique used to estimate the grip of a wheel like other known techniques, are not very precise.
- the aim of the invention is therefore in particular to improve the situation by proposing a new technique for estimating the grip of the wheels of a vehicle train.
- This estimation method is characterized by the fact that it comprises a step in which an electrical resistance is measured between the two rims insulated from each other at the level of the vehicle, then a wheel grip is estimated as a function of this measured electrical resistance.
- the estimation method according to the invention may include other characteristics which can be taken separately or in combination, and in particular:
- the grip of the wheels can be estimated as a function of a temperature outside the vehicle and / or a type of the tires;
- an alarm message can be generated when the estimated adhesion is below a chosen threshold
- the alarm message can be displayed on at least one screen present in the vehicle and / or the alarm message can be broadcast by at least one loudspeaker present in the vehicle.
- the invention also proposes an estimation device intended to equip a vehicle capable of traveling on a surface and comprising a train comprising two wheels each comprising an electrically conductive rim and on which a tire is mounted.
- This estimation device includes:
- a measuring device connected to two rims insulated from each other at the level of the vehicle, and measuring an electrical resistance between these rims
- At least one processor and at least one memory arranged to perform the operations consisting in estimating a grip of the wheels as a function of this measured electrical resistance.
- the estimation device according to the invention may include other characteristics which can be taken separately or in combination, and in particular:
- the invention also provides a vehicle, optionally of the automobile type, suitable for traveling on a surface, and comprising, on the one hand, a metal structure to which is secured a train comprising two wheels each comprising an electrically conductive rim and on which is mounted a tire, and, on the other hand, an estimation device of the type presented above.
- the rims can be coupled respectively to two pivots, one of which is electrically isolated from the rest of the vehicle and the other is electrically connected to the metal structure.
- FIG. 1 illustrates schematically and functionally a motor vehicle comprising a trajectory control device and an estimation device according to the invention, coupled to the front wheels,
- FIG. 2 schematically illustrates an example of an algorithm implementing an estimation method according to the invention
- FIG. 3 illustrates schematically and functionally an exemplary embodiment of an estimation device implementing at least part of an estimation method according to the invention.
- the invention aims in particular to provide an estimation method, and an associated DE estimation device, intended to allow the estimation of the grip of the wheels Rj of a train of a land vehicle V.
- the land vehicle V is of the automobile type. This is for example a car, as illustrated without limitation in Figure 1. But the invention is not limited to this type of land vehicle. It relates in fact to any type of land vehicle that can travel on a (rolling) surface, such as for example a road or a track, and comprising at least one train comprising at least two wheels. Thus, it also concerns, in particular, utility vehicles, camper vans, motorcycles (at least three wheels), minibuses, coaches, trucks, road vehicles, construction machinery and agricultural vehicles.
- Each wheel Rj (here of the front axle) comprises a rim JR which is electrically conductive and on which a tire PR is mounted.
- Each JR rim is coupled to a PVR pivot which is also coupled to at least one suspension arm and to which the brake system caliper is fixedly attached. of the vehicle V.
- the vehicle V could comprise two estimation devices DE, one coupled to two wheels of the front axle and the other coupled to two wheels of the rear axle, or else a single estimation device DE coupled to two wheels. of the rear axle.
- the use of two DE estimators allows a gain in precision.
- the invention provides in particular an estimation method intended to allow the estimation of the grip of the wheels Rj of a train of the vehicle V when the latter (V) is traveling on a rolling surface.
- This estimation method can be implemented at least partially by the estimation device DE which comprises for this purpose a measuring device DM, at least one processor PR, for example a digital signal (or DSP ("Digital Signal Processor). ")), And at least one memory MD, and therefore which can be produced in the form of a combination of circuits or electrical or electronic components (or” hardware ") and software modules (or” software ").
- the MD memory is RAM in order to store instructions for the implementation by the processor PR of at least part of the estimation process.
- the processor PR can comprise integrated circuits (or printed), or else several integrated circuits (or printed) connected by wired or non-wired connections.
- An integrated (or printed) circuit is understood to mean any type of device capable of performing at least one electrical or electronic operation.
- the estimation device DE comprises a processing part PT (comprising in particular the processor PR and the memory MD) and forming part of a computer CA which also comprises here a processing device.
- a processing part PT comprising in particular the processor PR and the memory MD
- CA which also comprises here a processing device.
- DC trajectory control which will be discussed later. But it doesn't have to be.
- the estimation device DE could form part of a computer other than that (CA) comprising the trajectory control device DC, and permanently on board the vehicle V, or else could be an item of equipment comprising its own. calculator.
- the estimation method comprises a step 10-40.
- Step 10-40 of the (estimation) method begins with a sub-step 10 in which one (the measuring device DM) measures the electrical resistance re between the two rims JR of the two wheels Rj isolated from each other at the level of the vehicle V, when the latter (V) is traveling on a rolling surface.
- the measuring device DM is connected to the two JR rims via two electric cables, and arranged so as to measure the electrical resistance re between these JR rims.
- This DM measuring device can therefore include an ohmmeter responsible for measuring the electrical resistance between the JR rims.
- step 20 of step 10-40 we (the processor PR and the memory MD) estimate (s) the grip ar of the wheels Rj on the running surface as a function of this re-measured electrical resistance.
- the adhesion ar can be estimated as a function of the re-measured electrical resistance using a correspondence table stored (for example in MD memory) and establishing a correspondence between electrical resistances and adhesions.
- the processor PR and the memory MD estimates (s) the grip ar of the wheels Rj as a function of the temperature outside the vehicle. V and / or the type of tires (supplier and model).
- the electrical conductivity of water varies slightly depending on its physical state, which depends on the outside temperature. Consequently, this option makes it possible to improve the precision of the estimate of the grip ar of the wheels Rj.
- the temperature outside the vehicle V can be supplied by a temperature sensor fitted to the vehicle V or by meteorological information received in the vehicle V (by a communication module by means of waves which it comprises so permanent or by a communicating device present temporarily in the vehicle V because it accompanies a passenger).
- This communicating device can, for example, be an intelligent mobile telephone (or “smartphone”) or a communicating electronic tablet.
- the latter integrates the outside temperature and / or the type of tires.
- step 10-40 can also comprise a sub-step 30 in which one (the processor PR and the memory MD) generates (s) an alarm message when the estimated adhesion ar is less than a chosen threshold.
- This alarm message can be intended for the driver of the vehicle V (if the latter (V) is not fully automated (or autonomous)) and / or a device on board the vehicle V and using (or taking in account) this grip information ar.
- step 10-40 can comprise a sub-step 40 in which this alarm message is displayed on at least one screen present in the vehicle V and / or this alarm message is broadcast by at least one loudspeaker present in vehicle V.
- the screen can be part of the central instrument panel CC, installed in (or on) the dashboard or any console control unit, or else the dashboard of the vehicle V. But as a variant the screen can be part of the aforementioned communicating device.
- the loudspeaker can be part of the vehicle V permanently. But as a variant, the loudspeaker can be part of the aforementioned communicating device.
- the grip information ar can be advantageously (but in particular) used by the trajectory control device DC which here forms part of the caculator CA also comprising (without limitation) the processing part PT of the estimation device DE.
- this DC trajectory control device can be dedicated to anti-skid (it can then be of the ESP or ESC type, in particular) or to anti-skid (it can then be of the ASR or TCS type, especially).
- the grip information ar could also be used, for example, by an adaptive cruise control (with a safety distance adapted according to the grip ar).
- DE estimation device could be part of the DC trajectory control device.
- one of the two PVR pivots (respectively coupled to the two JR rims) is electrically isolated from the rest of the vehicle V, and the other of these two PVR pivots is electrically connected to the metal structure.
- this PVR pivot allows this PVR pivot to transfer the electrostatic charges that accumulate on the metal structure of its vehicle V (and in particular on its body) to the JR rim, this JR rim then transferring these electrostatic charges to the associated PR tire, which transfers them in turn to the rolling surface.
- the electrical insulation of one of the PVR pivots can be done using insulating elastic joint (s) and ball joint (s) with Teflon between the moving parts.
- the estimation device DE can also comprise, in addition to its random access memory MD and its processor PR, a mass memory MM, in particular for storing the resistance. re measured and the possible temperature outside the vehicle V, and intermediate data involved in all its calculations and processing. Furthermore, this estimation device DE can also include an input interface IE for receiving at least the re-measured electrical resistance and the possible temperature outside the vehicle V for use in calculations or processing. , optionally after having shaped and / or demodulated and / or amplified them, in a manner known per se, by means of a digital signal processor PR '. In addition, this DE estimation device can also include an output interface IS, in particular for delivering the estimated adhesion ar and any alarm messages.
- a mass memory MM in particular for storing the resistance. re measured and the possible temperature outside the vehicle V, and intermediate data involved in all its calculations and processing.
- this estimation device DE can also include an input interface IE for receiving at least the re-measured electrical resistance and the possible temperature outside the vehicle V for use in calculations or processing
- the processor PR, the random access memory MD, and the possible mass memory MM, input interface IE, digital signal processor PR 'and output interface IS form part of the processing part PT of the device.
- DE estimate that may be part of the CA computer, as illustrated without limitation in FIG. 1.
- the estimation method can be implemented by a plurality of digital signal processors, random access memory, mass memory, input interface, output interface.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Emergency Alarm Devices (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1911330A FR3101946B1 (fr) | 2019-10-11 | 2019-10-11 | Estimation de l’adhérence de roues d’un train d’un véhicule par mesure de résistance |
| PCT/FR2020/051586 WO2021069810A1 (fr) | 2019-10-11 | 2020-09-14 | Estimation de l'adhérence de roues d'un train d'un véhicule par mesure de résistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4042133A1 true EP4042133A1 (fr) | 2022-08-17 |
Family
ID=69699976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20781052.4A Withdrawn EP4042133A1 (fr) | 2019-10-11 | 2020-09-14 | Estimation de l'adhérence de roues d'un train d'un véhicule par mesure de résistance |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4042133A1 (fr) |
| FR (1) | FR3101946B1 (fr) |
| WO (1) | WO2021069810A1 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6032520A (en) * | 1990-03-19 | 2000-03-07 | Japan Electronics Industry, Limited | Device for measuring action force of wheel and device for measuring stress of structure |
| FR2925005A3 (fr) * | 2007-12-14 | 2009-06-19 | Renault Sas | Procede d'estimation de l'adherence d'un vehicule automobile et dispositif correspondant |
| FI124059B (fi) * | 2008-09-19 | 2014-02-28 | Aalto Korkeakoulusaeaetioe | Parannus ajoneuvojen ajonhallintajärjestelmiin |
-
2019
- 2019-10-11 FR FR1911330A patent/FR3101946B1/fr active Active
-
2020
- 2020-09-14 EP EP20781052.4A patent/EP4042133A1/fr not_active Withdrawn
- 2020-09-14 WO PCT/FR2020/051586 patent/WO2021069810A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021069810A1 (fr) | 2021-04-15 |
| FR3101946B1 (fr) | 2021-09-10 |
| FR3101946A1 (fr) | 2021-04-16 |
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