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
  • B60C99/00—Subject matter not provided for in other groups of this subclass
  • B60C99/006—Computer aided tyre design or simulation
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F30/00—Computer-aided design [CAD]
  • G06F30/10—Geometric CAD
  • G06F30/15—Vehicle, aircraft or watercraft design
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F30/00—Computer-aided design [CAD]
  • G06F30/20—Design optimisation, verification or simulation
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06F—ELECTRIC DIGITAL DATA PROCESSING
  • G06F2111/00—Details relating to CAD techniques
  • G06F2111/10—Numerical modelling

Definitions

• the present invention relates to a method for modeling a tire in a rolling situation at a given speed and more specifically to a method comprising modeling the tilt torque exerted on the tire.
• the present invention also relates to a computer program product comprising program code instructions for implementing the aforementioned modeling method.
• the present invention relates to a real-time stabilization system of a vehicle comprising tire modeling means implementing the mentioned modeling method.
• the simulation tools require descriptive models of the behavior of the tires.
• reference actions in a turn correspond to the load transfer of the vehicle and to the variation of the crushed radius associated with this load, to the roll-induced inducing of the camber, and to the necessity of generating a force via a drift angle tap.
• Mx R. o 1 F ⁇ 'i Qsxi' ⁇ ⁇ Vmx
• R 0 is the free radius of the tire
• F z is the vertical load on the tire
• q Sxl is the coefficient of dependence linear to the load
• a Vmx is the scale factor associated with q Sxl
• Sx2 is the camber dependence coefficient
• y is the camber angle, sometimes also camber
• q Sx3 is the lateral force dependence coefficient
• F y is the transverse thrust force exerted on the tire
• F z0 is the reference load of the tire
• ⁇ ⁇ is the overall scale factor.
• the object of the present invention is to propose a method for modeling a tire in a rolling situation that includes modeling the tilting torque Mx exerted on the tire with improved precision.
• a method of modeling a tire under rolling conditions at a predetermined speed includes modeling the tilt torque exerted on the tire in which the tilting torque is the sum of at least:
• the tire having a drift angle and an inflation pressure
• the torque generated by the ground reaction is a function of the vehicle load, the speed, the camber angle, drift angle and inflation pressure.
• the torque generated by the ground reaction is calculated by the following formula:
• a torque generated by the reaction of the ground under the load decentered by the reference point by the transverse thrust force where Mx 31 , Mx 32 , Mx 33 , Mx 34 , Mx 35 , Mx 36 , Mx 37 and Mx 38 are predetermined coefficients, F z represents the vehicle load, y represents the camber angle, ⁇ represents the drift angle, V represents the speed and P represents the inflation pressure.
• the coefficients Mx 31 , Mx 32 , Mx 33 , Mx 34 , Mx 35 , Mx 36 , Mx 37 and Mx 38 are determined in a preliminary step comprising: • a substep of measurements on a tire bench; then
• the modeling method of the invention may be used to determine the behavior of a vehicle comprising the tire modeled thereby, and preferably to determine the behavior of the overturning vehicle.
• a computer program product downloadable from a communication network and / or recorded on a computer readable and / or executable medium by a processor, includes program code instructions for the implementation of the modeling process above.
• a real-time stabilization system of a vehicle comprising a tire comprises means for modeling the tire implementing the modeling method above.
• FIG. 1 represents the torque generated by the offset of the load of the vehicle by the camber angle
• FIG. 2 represents the torque generated by the transverse thrust force
• FIG. 3 represents the torque generated by the reaction of the ground under the load decentered by the reference point by the transverse thrust force
• FIG. 4 represents a comparison diagram between the measured switching torque Mx and the switching torque model Mx of the formulation MF-5.2 and the model of the switching torque Mx used in the modeling method according to an embodiment of FIG. the invention. Modes of realization
• the present embodiment relates in the first place to a method of modeling a tire under rolling conditions at a predetermined speed.
• the tire is subjected to a downward representative load F z of a vehicle and to a transverse thrust force F y .
• the tire is inclined relative to the vertical of a camber angle y.
• the method comprises modeling the tilting torque Mx exerted on the tire in which the tilting torque Mx is the sum of at least:
• the modeling of the Mx tilt torque exerted on a tire of the modeling method described above has an improved precision with regard to the precision presented by the formulation MF-5.2 of the prior art because the modeling the Mx tilting torque better integrates the effects of the Mx 3 torque, namely the torque created by the off-center reaction of the ground, the effects of the internal temperature of the tire and the surface temperature of the tire, as well as those of the speed of the tire. vehicle, the tire inflation pressure and the transverse force of the vehicle.
• the modeling of the tilting torque Mx exerted on the tire is performed under the typical conditions encountered on a vehicle comprising this tire.
• these typical conditions cover a wide range of uses of the tire, such as, for example, the rolling of the tire in a straight line or the high-speed running on a circuit or the safety maneuvers.
• Figure 1 illustrates the torque Mx 1 generated by the offset vehicle load by the camber angle.
• Figure 1 illustrates the couple
• Figure 1 illustrates the camber angle y which represents the angle formed by the running surface of the vehicle. pneumatic with the vertical and the crushed radius R e which represents the distance between the reference point C of the tire and the point of contact of the tire W with the ground.
• Figure 2 illustrates the torque Mx 2 generated by the transverse thrust force. Particularly, Figure 2 illustrates the torque Mx 2 generated at the contact point of the tire W with the ground when a transverse thrust force F is exerted on the reference point C of the tire. In addition, Figure 2 illustrates the load F z exerted on the reference point C of the tire.
• Figure 3 illustrates the torque Mx 3 generated by the ground reaction F R under load F z . It should be noted that the vertical component of the ground reaction F R is off-center of the reference point C of the tire by the transverse thrust force F is exerted on the reference point C of the tire. Figure 3 illustrates the point D of the tire on which the reaction of soil F R off-center is exerted.
• the torque Mx 3 is a function of the load F z of the vehicle, the speed (V) of the vehicle, the camber angle y, the drift angle ⁇ and the inflation pressure P.
• the drift angle is the angle formed by the intersection of the plane of the ground with the wheel plane relative to the vector of the speed.
• the Mx 3 pair generated by the soil reaction is calculated by the formula
• Mx 31, 32 Mx, Mx 33, 34 Mx, Mx 35, 36 Mx, Mx and Mx 37 38 are predetermined coefficients
• F z is the charge of the vehicle
• y is the angle of camber
• ⁇ represents the drift angle
• V represents the speed
• P represents the inflation pressure
• the coefficients Mx 31 , Mx 32 , Mx 33 , Mx 34 , Mx 35 , Mx 36 , Mx 37 and Mx 38 are determined during a preliminary stage of the modeling process comprising a sub-step of bench-based measurements (for example ground plane-type rolling machine) of said tire and an iterative adjustment sub-step of the coefficients until the model reproduces the measurements to a predetermined error margin.
• bench-based measurements for example ground plane-type rolling machine
• Figure 4 illustrates a comparison diagram between the Mx tilt torque measured on a bench, the Mx tilt torque model of the above-mentioned MF-5.2 formulation and the model of the Mx tilt torque used in the modeling process described above.
• the modeling method of the invention can be used to determine the behavior of a vehicle comprising the tire modeled thereby.
• the described modeling method can be used to determine the reversing behavior of the vehicle.
• the method is implemented by a computer program product downloadable from a communication network and / or recorded on a computer readable and / or executable medium by a processor, including program code.
• the method may be integrated into a real-time stabilization system of a vehicle comprising a tire modeled as described above.
• the driver assistance system can more accurately determine the reversal torque and thus more effectively implement anti-rollover measures.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Geometry (AREA)
• Computer Hardware Design (AREA)
• General Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Evolutionary Computation (AREA)
• Mechanical Engineering (AREA)
• Computational Mathematics (AREA)
• Mathematical Analysis (AREA)
• Mathematical Optimization (AREA)
• Pure & Applied Mathematics (AREA)
• Aviation & Aerospace Engineering (AREA)
• Automation & Control Theory (AREA)
• Tires In General (AREA)
• Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Applications Claiming Priority (2)

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• 2013
  • 2013-08-02 FR FR1357693A patent/FR3009402B1/fr not_active Expired - Fee Related
• 2014
  • 2014-07-23 EP EP14759016.0A patent/EP3011486A1/fr not_active Withdrawn
  • 2014-07-23 US US14/909,500 patent/US20160207366A1/en not_active Abandoned
  • 2014-07-23 JP JP2016530577A patent/JP6260701B2/ja not_active Expired - Fee Related
  • 2014-07-23 WO PCT/FR2014/051916 patent/WO2015015097A1/fr active Application Filing
  • 2014-07-23 KR KR1020167004984A patent/KR101829695B1/ko active IP Right Grant
  • 2014-07-23 CN CN201480042585.1A patent/CN105408901B/zh active Active

Non-Patent Citations (2)

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