FR2724728A1 - Measuring system for determining force and power applied e.g at bicycle crank - Google Patents
Measuring system for determining force and power applied e.g at bicycle crank Download PDFInfo
- Publication number
- FR2724728A1 FR2724728A1 FR9511128A FR9511128A FR2724728A1 FR 2724728 A1 FR2724728 A1 FR 2724728A1 FR 9511128 A FR9511128 A FR 9511128A FR 9511128 A FR9511128 A FR 9511128A FR 2724728 A1 FR2724728 A1 FR 2724728A1
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- FR
- France
- Prior art keywords
- crank
- pedal
- pivot
- measuring
- pedaling
- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
- A61B5/224—Measuring muscular strength
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
- B62J45/40—Sensor arrangements; Mounting thereof
- B62J45/41—Sensor arrangements; Mounting thereof characterised by the type of sensor
- B62J45/411—Torque sensors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J45/00—Electrical equipment arrangements specially adapted for use as accessories on cycles, not otherwise provided for
- B62J45/40—Sensor arrangements; Mounting thereof
- B62J45/42—Sensor arrangements; Mounting thereof characterised by mounting
- B62J45/421—Sensor arrangements; Mounting thereof characterised by mounting at the pedal crank
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J50/00—Arrangements specially adapted for use on cycles not provided for in main groups B62J1/00 - B62J45/00
- B62J50/20—Information-providing devices
- B62J50/21—Information-providing devices intended to provide information to rider or passenger
- B62J50/22—Information-providing devices intended to provide information to rider or passenger electronic, e.g. displays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M3/00—Construction of cranks operated by hand or foot
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2218—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction
- G01L1/2225—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being of the column type, e.g. cylindric, adapted for measuring a force along a single direction the direction being perpendicular to the central axis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/108—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving resistance strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/242—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying torque and velocity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/24—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity
- G01L3/247—Devices for determining the value of power, e.g. by measuring and simultaneously multiplying the values of torque and revolutions per unit of time, by multiplying the values of tractive or propulsive force and velocity by measuring and simultaneously multiplying tractive or propulsive force and velocity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/161—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance
- G01L5/1627—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in ohmic resistance of strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
- G01L5/225—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to foot actuated controls, e.g. brake pedals
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B22/00—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
- A63B22/06—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement
- A63B22/0605—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement performing a circular movement, e.g. ergometers
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
- A63B2220/10—Positions
- A63B2220/16—Angular positions
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
- A63B2220/50—Force related parameters
- A63B2220/51—Force
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
- A63B2220/50—Force related parameters
- A63B2220/54—Torque
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B69/00—Training appliances or apparatus for special sports
- A63B69/16—Training appliances or apparatus for special sports for cycling, i.e. arrangements on or for real bicycles
Abstract
Description
La présente invention se rapporte à un procédé de mesure et d'analyse des caractéristiques de la force motrice de pédalage fournie par une personne à l'ensemble de pédalage d'une bicyclette, ainsi qu'à un dispositif pour la mise en oeuvre de ce procédé. The present invention relates to a method for measuring and analyzing the characteristics of the pedaling driving force supplied by a person to the pedaling assembly of a bicycle, as well as to a device for implementing this. process.
Un appareil de mesure et d'analyse des données relatives à la performance d'un cycliste est décrit dans la publication de brevet DD-294,673. Il comprend des cellules de mesure de force logées dans le corps de la pédale, permettant de mesurer l'intensité de la pression exercée par le cycliste sur la pédale. An apparatus for measuring and analyzing data relating to the performance of a cyclist is described in patent publication DD-294,673. It includes force measurement cells housed in the pedal body, making it possible to measure the intensity of the pressure exerted by the cyclist on the pedal.
Complémentairement, des cellules de mesure d'angle mesurent l'écart angulaire entre la direction générale du plan d'appui de la pédale et l'axe du pivot sur lequel cette dernière est montée, d'od l'on déduit ensuite l'angle d'application de la force de pédalage sur la surface d'appui de la pédale.In addition, angle measurement cells measure the angular difference between the general direction of the pedal support plane and the axis of the pivot on which the latter is mounted, from which the angle is then deduced. application of the pedaling force on the bearing surface of the pedal.
L'ensemble du dispositif de mesure devant être logé dans la cavité interne de la pédale, les dimensions générales de celle-ci doivent être augmentées. Il s'en suit une moindre transmission des efforts du cycliste à l'essieu du pédalier, et donc une diminution du rendement. Since the entire measuring device must be housed in the internal cavity of the pedal, the general dimensions of the pedal must be increased. It follows a less transmission of the efforts of the cyclist to the axle of the crankset, and therefore a decrease in performance.
Un autre système permettant de rapporter le travail fourni par le cycliste à la vitesse angulaire de la manivelle de pédalier est connu de la publication de brevet DE-3,722,728. I1 comprend des jauges de contrainte transformant en signaux électriques les efforts mécaniques auxquels est soumise la manivelle de pédalier, de même que des capteurs de déplacement, l'ensemble des données étant ensuite transmis à un micro-ordinateur pour l'évaluation des performances du cycliste. Le système ne permet toutefois pas de connaître la direction d'application de la force de pédalage sur le plan d'appui de la pédale, seul le moment angulaire, autrement dit la composante de la force dirigée dans la direction générale d'avance, étant enregistré, puis traité. Another system making it possible to relate the work provided by the cyclist to the angular speed of the crankset is known from patent publication DE-3,722,728. I1 includes strain gauges transforming into mechanical signals the mechanical forces to which the crankset is subjected, as well as displacement sensors, all of the data then being transmitted to a microcomputer for evaluating the performance of the cyclist . However, the system does not make it possible to know the direction of application of the pedaling force on the bearing plane of the pedal, only the angular momentum, in other words the component of the force directed in the general direction of advance, being saved, then processed.
La présente invention a pour but de remédier à ces difficultés ainsi qu'à d'autres encore, en proposant un procédé de mesure et d'analyse des caractéristiques de la force motrice de pédalage fournie par un cycliste à l'ensemble de pédalage d'une bicyclette, ce procédé comprenant les étapes de mesure, sous forme de signaux électriques, du couple résistant auquel est soumis le pivot supportant la pédale à pivotement, ainsi que de la position angulaire de la manivelle de pédalier, ces signaux électriques étant ensuite amplifiés, puis numérisés, avant d'être transmis par télémétrie à un appareil de traitement, de mémorisation et d'affichage des données. The object of the present invention is to remedy these difficulties as well as others, by proposing a method for measuring and analyzing the characteristics of the pedaling driving force supplied by a cyclist to the pedaling assembly. a bicycle, this method comprising the steps of measuring, in the form of electrical signals, the resisting torque to which the pivot supporting the pivoting pedal is subjected, as well as the angular position of the crank, these electrical signals then being amplified, then digitized, before being transmitted by telemetry to a data processing, storage and display device.
Il est alors possible, moyennant un calcul vectoriel approprié, de déterminer successivement les forces tangentielles s'exerçant sur le
pivot-support de la pédale selon deux directions
connues ; et, connaissant la position angulaire de la manivelle à
différents moments du cycle de pédalage, les
composantes de la force de pédalage relativement à un
référentiel lié à ladite manivelle.It is then possible, by means of an appropriate vectorial calculation, to successively determine the tangential forces acting on the
pedal support pivot in two directions
known; and knowing the angular position of the crank
different moments of the pedaling cycle, the
components of the pedaling force relative to a
repository linked to said crank.
Selon un avantage essentiel du présent procédé, le couple résistant perpendiculairement à l'axe du pivot de pédale étant le même dans toutes les directions, la force de pédalage peut être déterminée de la même manière dans toutes les directions à son point d'application sur le pivot-support. According to an essential advantage of the present method, the resisting torque perpendicular to the axis of the pedal pivot being the same in all directions, the pedaling force can be determined in the same way in all directions at its point of application on the support pivot.
Selon un autre de ses avantages, le présent procédé permet, en proposant de mesurer non pas le fléchissement de la manivelle de pédalier, mais les contraintes tangentielles auxquelles il est soumis, de s'affranchir du bras de levier de la force de pédalage. According to another of its advantages, the present method allows, by proposing to measure not the deflection of the crank, but the tangential stresses to which it is subjected, to overcome the lever arm of the pedaling force.
La présente invention a également pour objet un dispositif pour la mise en oeuvre du procédé cidessus. The present invention also relates to a device for implementing the above process.
Selon une variante d'exécution préférée mais non limitative, ce dispositif comprendra au moins quatre jauges de contrainte disposées en couronne sur le pivot-support de la pédale, selon deux directions perpendiculaires à l'axe de celui-ci, en pratique à angle droit l'une par rapport à l'autre. According to a preferred but non-limiting variant, this device will comprise at least four strain gauges arranged in a crown on the pivot-support of the pedal, in two directions perpendicular to the axis thereof, in practice at a right angle. one in relation to the other.
Le dispositif sera complété par une unité de mesure de la position angulaire de la manivelle de pédalier, par exemple du type mesureur d'angle ou de temps par rapport à un émetteur de positionnement. The device will be completed by a unit for measuring the angular position of the crankset, for example of the angle or time type with respect to a positioning transmitter.
Le présent dispositif de mesure ne nécessite par conséquent, pour son installation, aucune modification du corps de la pédale. The present measuring device therefore does not require, for its installation, any modification of the pedal body.
Par ailleurs, les moyens de mesure étant avantageusement portés par le pivot de pédale, cette dernière peut être facilement remplacée, sans risque de détérioration pour lesdits moyens de mesure. Furthermore, the measuring means being advantageously carried by the pedal pivot, the latter can be easily replaced, without risk of deterioration for said measuring means.
Les caractéristiques techniques et d'autres avantages de la présente invention sont consignés dans la description qui suit, effectuée à titre d'exemple seulement sur un mode d'exécution en référence au dessin accompagnant sur lequel la figure 1 est une vue en perspective partielle de
l'ensemble de pédalage équipé du dispositif de mesure
des caractéristiques de la force de pédalage conforme
à l'invention la figure 2 est une vue en perspective partielle et
en éclaté de l'ensemble formé par la manivelle de
pédalier, le pivot support de pédale et la pédale ; la figure 3 est une vue partielle de profil du pivot
support de pédale et de la manivelle de pédalier ; la figure 4 est une représentation schématique des
circuits de mesure, de traitement et d'affichage des
données ;; la figure 5 est une vue partielle de la manivelle de
pédalier articulée au cadre de la bicyclette, avec
les diodes émettrices et réceptrices, respectivement
de l'unité de réception des données et de l'émetteur
de position la figure 6 représente les deux directions de mesure
des jauges de contrainte fixées sur le pivot de pédale la figure 7 représente la force de pédalage produite
par le cycliste décomposée dans un référentiel lié à
la manivelle de pédalier.The technical characteristics and other advantages of the present invention are recorded in the description which follows, given by way of example only in one embodiment with reference to the accompanying drawing in which FIG. 1 is a partial perspective view of
the pedaling unit fitted with the measuring device
characteristics of the consistent pedaling force
to the invention FIG. 2 is a partial perspective view and
exploded from the assembly formed by the crank
crankset, pedal support pivot and pedal; Figure 3 is a partial profile view of the pivot
pedal support and bottom bracket crank; Figure 4 is a schematic representation of
circuits for measuring, processing and displaying
data ;; Figure 5 is a partial view of the crank
pedals articulated to the bicycle frame, with
the emitting and receiving diodes, respectively
the data receiving unit and the transmitter
position Figure 6 shows the two directions of measurement
strain gauges fixed on the pedal pivot Figure 7 represents the pedaling force produced
by the cyclist broken down into a repository linked to
the crankset.
Une bicyclette étant symétrique selon sa plus grande longueur, l'invention sera décrite en référence à un seul côté de celle-ci, étant entendu que les moyens de l'invention sont répétés à l'identique de l'autre côté. A bicycle being symmetrical along its greatest length, the invention will be described with reference to only one side thereof, it being understood that the means of the invention are repeated identically on the other side.
La bicyclette représentée en partie seulement sur la figure 1, et désignée dans son ensemble par la référence générale 1, comprend principalement un cadre 2 et un ensemble de pédalage ou pédalier 3 pour la transmission, par exemple au moyen d'une chaîne 4, de la force de pédalage produite par l'utilisateur à la roue arrière 5 de ladite bicyclette 1. The bicycle shown only in part in FIG. 1, and designated as a whole by the general reference 1, mainly comprises a frame 2 and a pedaling or pedaling assembly 3 for the transmission, for example by means of a chain 4, of the pedaling force produced by the user at the rear wheel 5 of said bicycle 1.
L'ensemble de pédalage 3 comprend classiquement une pédale 6 reliée à pivotement au disque d'entraînement 7 de la chaîne 4 par une manivelle 8 et un pivot-support 9. The pedaling assembly 3 conventionally comprises a pedal 6 pivotally connected to the drive disc 7 of the chain 4 by a crank 8 and a pivot-support 9.
La pédale 6 est montée sur le pivot-support 9 au moyen d'un roulement 10. Le pivot-support 9 se trouve monté par son extrémité libre par un tourillon 11 à la manivelle 8. The pedal 6 is mounted on the support pivot 9 by means of a bearing 10. The support pivot 9 is mounted at its free end by a pin 11 at the crank 8.
Selon sa caractéristique essentielle, et comme il ressort plus particulièrement des figures 2 et 3, le dispositif de mise en oeuvre du présent procédé comprend tout d'abord une cellule 12 de mesure du couple résistant s'exerçant sur le pivot-support 9 de la pédale 6. According to its essential characteristic, and as appears more particularly from FIGS. 2 and 3, the device for implementing the present method firstly comprises a cell 12 for measuring the resistive torque exerted on the pivot-support 9 of the pedal 6.
Selon une forme d'exécution préférée mais non-limitative, cette cellule 12 est constituée de quatre demi-ponts ou jauges 13, 14, 15 et 16 de mesure des contraintes. According to a preferred but non-limiting embodiment, this cell 12 consists of four half-bridges or gauges 13, 14, 15 and 16 for measuring stresses.
Ces jauges, aptes à convertir en un signal électrique proportionnel les contraintes mécaniques auxquelles elles sont soumises, sont disposées radialement sur le pivot-support 9 de la pédale 6, selon deux directions perpendiculaires à l'axe dudit pivot 9. Les contraintes tangentielles s'exerçant sur le pivot sont ainsi mesurées selon deux directions indépendantes, en pratique à 90 l'une par rapport à l'autre. These gauges, capable of converting the mechanical stresses to which they are subjected into a proportional electrical signal, are arranged radially on the support pivot 9 of the pedal 6, in two directions perpendicular to the axis of said pivot 9. The tangential stress s' exerting on the pivot are thus measured in two independent directions, in practice at 90 relative to one another.
Les jauges de contrainte 13, 14, 15 et 16 reposent avantageusement sur un film conducteur 17 rendu solidaire du pivot-support 9, et de longueur égale exactement au périmètre dudit pivot, à savoir r.D, oû D est le diamètre du pivot. Ce film peut également recevoir les connexions électriques d'autres composants du système. The strain gauges 13, 14, 15 and 16 advantageously rest on a conductive film 17 made integral with the pivot-support 9, and of length exactly equal to the perimeter of said pivot, namely r.D, where D is the diameter of the pivot. This film can also receive electrical connections from other system components.
La cellule 12 de mesure du couple résistant est complétée par un convertisseur 18 courant alternatif/courant continu pour l'amplification et la numérisation des signaux électriques produits par les jauges de contrainte, comme il sera décrit plus en détail ultérieurement. The resistive torque measurement cell 12 is completed by an alternating current / direct current converter 18 for the amplification and digitization of the electrical signals produced by the strain gauges, as will be described in more detail later.
Les mesures de contrainte réalisées par la cellule 12 sont transmises à un récepteur de données 19 fixé sur le cadre 2 de la bicyclette 1 au moyen d'un couple de diodes, formé d'une diode d'émission 20 fixée à la manivelle 8, et d'une diode de réception 21, fixée au cadre 2. The stress measurements carried out by the cell 12 are transmitted to a data receiver 19 fixed to the frame 2 of the bicycle 1 by means of a pair of diodes, formed by a transmission diode 20 fixed to the crank 8, and a receiving diode 21, fixed to frame 2.
Une fois transmises au récepteur 19, ces mesures sont ensuite transférées par liaison filaire 22 vers une unité de stockage et de traitement des données 23, avant d'être finalement affichées sur un écran de visualisation 24 placé dans le champ de vision du cycliste. Once transmitted to the receiver 19, these measurements are then transferred by wire link 22 to a data storage and processing unit 23, before being finally displayed on a display screen 24 placed in the cyclist's field of vision.
Le présent dispositif est complété par un émetteur de position 25 à deux diodes, d'une part d'émission 26 fixée au cadre 2, et d'autre part de réception 27 fixée à la manivelle 8. The present device is completed by a position transmitter 25 with two diodes, on the one hand emission 26 fixed to the frame 2, and on the other hand reception 27 fixed to the crank 8.
Comme représenté sur la figure 5, les deux paires de diodes 21,26 et 20,27 peuvent être avantageusement enfermées chacune dans un boîtier, respectivement 28 et 29, pour leur protection mécanique et aux intempéries, ainsi qu'à la lumière ambiante, de façon à éviter tout risque de perturbation des transmission des données. As shown in FIG. 5, the two pairs of diodes 21, 26 and 20, 27 can each be advantageously enclosed in a housing, respectively 28 and 29, for their mechanical and weather protection, as well as in ambient light, from so as to avoid any risk of disruption of data transmission.
La diode 26 de l'émetteur de position 25 émet un signal infra-rouge modulé qui parvient à la diode réceptrice 27 au moment où la manivelle 8 de pédalier 3 dépasse la diode émettrice 26. The diode 26 of the position transmitter 25 emits a modulated infrared signal which reaches the receiving diode 27 when the crank 8 of the pedal 3 exceeds the emitting diode 26.
Un premier tour complet de la manivelle 8 est alors utilisé pour déterminer la période T de son mouvement de rotation. A first complete revolution of the crank 8 is then used to determine the period T of its rotational movement.
Lorsque la manivelle 8 dépasse la diode émettrice 26 pour la seconde fois, le signal reçu par la diode réceptrice 27 est amplifié par un amplificateur 30, puis adressé à un micro-contrleur 31 assurant l'activation de la cellule 12 de mesure des contraintes par commande d'un commutateur électronique 32. When the crank 8 exceeds the emitting diode 26 for the second time, the signal received by the receiving diode 27 is amplified by an amplifier 30, then sent to a micro-controller 31 ensuring the activation of the cell 12 for measuring the stresses by control of an electronic switch 32.
Les mesures de contrainte sont opérées à une fréquence proportionnelle à la période du mouvement de rotation de la manivelle 8, par exemple T/16, chaque mesure pouvant ainsi être associée de façon fiable à une position angulaire a donnée de la manivelle 8 de pédalier 3. The stress measurements are carried out at a frequency proportional to the period of the rotation movement of the crank 8, for example T / 16, each measurement thus being able to be reliably associated with an angular position given of the crank 8 of the bottom bracket 3 .
Elles sont ensuite amplifiées, puis numérisées au niveau du convertisseur avant d'être temporairement stockées dans une mémoire tampon (non représentée sur les figures). They are then amplified, then digitized at the level of the converter before being temporarily stored in a buffer memory (not shown in the figures).
Au passage suivant de la manivelle 8 devant la diode émettrice 26 de l'émetteur de position 25, les mesures de contrainte effectuées dans l'intervalle de temps T sont déchargées via les diodes émettrice 20 et réceptrice 21 vers le récepteur de données 19. On the next passage of the crank 8 in front of the transmitting diode 26 of the position transmitter 25, the stress measurements carried out in the time interval T are downloaded via the transmitting and receiving diodes 21 to the data receiver 19.
Les mesures sont ensuite transférées vers les unités de traitement 23 et d'affichage 24 au moyen d'un amplificateur 33 et de la liaison filaire 22 décrite précédemment. The measurements are then transferred to the processing 23 and display 24 units by means of an amplifier 33 and the wire link 22 described above.
Comme représenté sur la figure 6, les composantes F1 et F2 du couple résistant s'exerçant sur le pivot 9 de pédale 6 sont mesurées selon deux directions tangentes au pivot-support 9 et perpendiculaires entre elles, déterminées par le positionnement des jauges, respectivement 13,14 et 15,16 sur ledit pivot. As shown in FIG. 6, the components F1 and F2 of the resistive torque acting on the pivot 9 of the pedal 6 are measured in two directions tangent to the support pivot 9 and perpendicular to each other, determined by the positioning of the gauges, respectively 13 , 14 and 15,16 on said pivot.
Le pivot de pédale 6 étant fixé par vissage sur la manivelle 8 de pédalier 3, il résulte généralement de ce montage (voir figure 3), un écart angulaire noté ss entre les directions d'un diamètre entre deux jauges opposées réparties sur une couronne et l'axe de la manivelle 8. The pedal pivot 6 being fixed by screwing on the crank 8 of the bottom bracket 3, it generally results from this assembly (see FIG. 3), an angular difference noted ss between the directions of a diameter between two opposite gauges distributed on a crown and the axis of the crank 8.
Cet écart, fonction du pas de filetage du tourillon 11 du pivot-support 9, est constant et peut être mesuré directement au moyen d'un mesureur d'angle. This difference, which is a function of the thread pitch of the pin 11 of the support pivot 9, is constant and can be measured directly by means of an angle measurer.
I1 peut aussi être déterminé par étalonnage préalable de la cellule 12 de mesure du couple résistant comme décrit ci-dessous. I1 can also be determined by prior calibration of the cell 12 for measuring the resistive torque as described below.
La pédale 6 étant placée à son point d'équilibre stable inférieur, on la soumet à une force d'intensité connue dirigée vers le bas. The pedal 6 being placed at its lower stable equilibrium point, it is subjected to a force of known intensity directed downwards.
L'écart entre la force d'étalonnage connue et la résultante des composantes tangentielles F01 et F02 mesurées par les jauges selon les directions F1 et F2 est représentatif du décalage angulaire ss entre ces jauges et l'axe de la manivelle 8, dont la valeur est fournie par les relations suivantes
F1 et F2 étant les modules des contraintes tangentielles mesurées par les couples de jauges, respectivement 14,15 et 16,17 à un instant donné du cycle de pédalage, la force résultante F produite par le cycliste est donnée par la relation
avec
F1
arctg z =
F2 où z est l'angle d'application de la force F sur le pivot-support 9 de pédale 6.F1 and F2 being the modules of the tangential stresses measured by the pairs of gauges, respectively 14.15 and 16.17 at a given time of the pedaling cycle, the resulting force F produced by the cyclist is given by the relation
with
F1
arctg z =
F2 where z is the angle of application of the force F on the pivot-support 9 of pedal 6.
Connaissant l'écartement angulaire a, et donc la position de la manivelle 8 de pédalier 3 par rapport à l'émetteur de position 25 fixe pour chaque couple de mesure F1,F2, il est donc possible de déterminer simultanément le module, de même que l'angle d'application de la force de pédalage F pour chaque position de mesure de la manivelle 8 de pédalier 3. Knowing the angular spacing a, and therefore the position of the crank 8 of the bottom bracket 3 relative to the fixed position transmitter 25 for each measurement torque F1, F2, it is therefore possible to simultaneously determine the module, as well as the angle of application of the pedaling force F for each measurement position of the crank 8 of the bottom bracket 3.
Conformément à l'invention, et comme représenté sur la figure 7, la force efficace de pédalage F n normale à l'axe de la manivelle 8 de pédalier 3 résulte de la décomposition de la force F perpendiculairement à l'axe de la manivelle 8 de pédalier 3, la deuxième composante Ft étant tangentielle à ce même levier suivant la relation
avec Fn = -F1sin ss + F2cos ss
Ft = -F1cos fi + F2sin fi
Etant donné que, dans l'hypothèse d'un pédalage continu, la durée de la période du mouvement de rotation de la manivelle 8 de pédalier 3 ne varie que faiblement, et que sa vitesse angulaire est sensiblement constante compte tenu de l'inertie du système, l'erreur de positionnement des points de mesure est donc faible.According to the invention, and as shown in FIG. 7, the effective pedaling force F n normal to the axis of the crank 8 of the crankset 3 results from the decomposition of the force F perpendicular to the axis of the crank 8 bottom bracket 3, the second component Ft being tangential to this same lever according to the relation
with Fn = -F1sin ss + F2cos ss
Ft = -F1cos fi + F2sin fi
Given that, in the case of continuous pedaling, the duration of the period of the rotational movement of the crank 8 of the crankset 3 varies only slightly, and that its angular speed is substantially constant taking into account the inertia of the system, the positioning error of the measurement points is therefore low.
Des variations dans l'effort de pédalage fourni par le cycliste, qui se traduisent par des variations plus ou moins importantes de la période du mouvement de rotation de la manivelle 8, sont donc détectées de façon rapide et fiable par l'unité de traitement 23. Variations in the pedaling effort provided by the cyclist, which result in more or less significant variations in the period of the rotational movement of the crank 8, are therefore detected quickly and reliably by the processing unit 23 .
On peut également enregistrer et garder en mémoire un cycle de fonctionnement, c'est-à-dire un tour de pédale, et le comparer au cycle en cours, de façon à rendre la représentation indépendante du poids du cycliste, en particulier de celui de ses jambes. It is also possible to record and keep in memory an operating cycle, that is to say a pedal turn, and compare it to the cycle in progress, so as to make the representation independent of the weight of the cyclist, in particular that of His legs.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9415162U DE9415162U1 (en) | 1994-09-19 | 1994-09-19 | Electronic device for determining pedaling force |
| DE29507357U DE29507357U1 (en) | 1995-04-05 | 1995-04-05 | Device for recording and displaying the pedal force curve on a bicycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2724728A1 true FR2724728A1 (en) | 1996-03-22 |
| FR2724728B1 FR2724728B1 (en) | 1999-12-24 |
Family
ID=25962459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR9511128A Expired - Fee Related FR2724728B1 (en) | 1994-09-19 | 1995-09-19 | DEVICE FOR RECORDING AND MEASURING THE CHARACTERISTICS OF THE PEDALING FORCE PROVIDED BY A CYCLIST |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH08145824A (en) |
| FR (1) | FR2724728B1 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002024520A1 (en) * | 2000-09-21 | 2002-03-28 | Dube Jean Yves | Method and apparatus for proportionally assisted propulsion |
| DE10044701C1 (en) * | 2000-09-08 | 2002-05-23 | Rainer Oberheim | Device for determining the pedaling force |
| FR2878328A1 (en) * | 2004-11-24 | 2006-05-26 | Look Cycle Internat Sa | Dynamometric cycle pedal for e.g. measuring applied forces, has deformation gauges disposed in interstice while extending in longitudinal direction of pedal body to measure transversal forces applied during pedaling |
| EP2072387A1 (en) * | 2007-12-20 | 2009-06-24 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | A cycling arrangement |
| EP2165171A1 (en) | 2007-07-06 | 2010-03-24 | Fisher, Mark | Crank arm with strain amplifier |
| CH700681A1 (en) * | 2009-03-23 | 2010-09-30 | Rmd Group Ag | Apparatus for transmitting force between a foot and a bicycle pedal and method for measuring a force acting on a bicycle pedal in the direction of the pedal shaft power. |
| WO2010144964A1 (en) * | 2009-06-18 | 2010-12-23 | Power Pedals Pty Ltd | Pedal torque measurement |
| EP2504678A1 (en) | 2009-11-28 | 2012-10-03 | Breakaway Innovations Pty Ltd | Cyclic cranked system method and related devices |
| US8387470B2 (en) | 2009-08-24 | 2013-03-05 | Polar Electro Oy | Pedalling measurement |
| WO2014184485A1 (en) | 2013-05-14 | 2014-11-20 | Sensix | Bicycle pedal provided with at least one sensor |
| US20200102036A1 (en) * | 2018-09-27 | 2020-04-02 | Bion Inc. | Direct force measurement device for crank |
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| DE10323889A1 (en) * | 2003-05-27 | 2004-12-16 | Ehrfeld Mikrotechnik Ag | Rolling bearings with polymer electronics |
| JP5490915B2 (en) * | 2010-10-25 | 2014-05-14 | パイオニア株式会社 | Pedaling correction assisting device, pedaling correction assisting method, program for assisting pedaling correction, medium recording program for assisting pedaling correction |
| EP3364164B1 (en) * | 2011-07-18 | 2019-09-11 | Michael J. Grassi | Torque sensor |
| IT201800005299A1 (en) | 2018-05-11 | 2019-11-11 | BICYCLE COMPONENT EQUIPPED WITH STRESS / DEFORMATION SENSOR COMPENSATED FOR TEMPERATURE | |
| IT201800005297A1 (en) | 2018-05-11 | 2019-11-11 | BICYCLE CRANK AND RELATIVE CRANKSET | |
| IT201800005302A1 (en) | 2018-05-11 | 2019-11-11 | TRANSMISSION SIDE BICYCLE CRANK, EQUIPPED WITH STRESS / DEFORMATION DETECTOR FOR A TORQUE OR POWER METER, AS WELL AS RELATED METHODS | |
| TWI804619B (en) | 2018-05-11 | 2023-06-11 | 義大利商坎帕克諾羅公司 | Bicycle crankarm provided with electric/electronic system |
| IT201800005294A1 (en) | 2018-05-11 | 2019-11-11 | COMPONENT OF BICYCLE IN COMPOSITE MATERIAL AND RELATED MANUFACTURING PROCESS | |
| WO2020079575A1 (en) * | 2018-10-15 | 2020-04-23 | Tq-Systems Gmbh | Control device and control method for an electric motor of an electric bicycle |
| IT201900014676A1 (en) * | 2019-08-12 | 2021-02-12 | Favero Electronics S R L | PEDAL FOR BICYCLES |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10044701C1 (en) * | 2000-09-08 | 2002-05-23 | Rainer Oberheim | Device for determining the pedaling force |
| WO2002024520A1 (en) * | 2000-09-21 | 2002-03-28 | Dube Jean Yves | Method and apparatus for proportionally assisted propulsion |
| US6866111B2 (en) | 2000-09-21 | 2005-03-15 | Jean-Yves Dubé | Method and apparatus for proportionally assisted propulsion |
| FR2878328A1 (en) * | 2004-11-24 | 2006-05-26 | Look Cycle Internat Sa | Dynamometric cycle pedal for e.g. measuring applied forces, has deformation gauges disposed in interstice while extending in longitudinal direction of pedal body to measure transversal forces applied during pedaling |
| EP1661606A1 (en) * | 2004-11-24 | 2006-05-31 | Look Cycle International | Pedal for measuring mechanical parameters |
| EP2165171A1 (en) | 2007-07-06 | 2010-03-24 | Fisher, Mark | Crank arm with strain amplifier |
| EP2072387A1 (en) * | 2007-12-20 | 2009-06-24 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | A cycling arrangement |
| WO2009082215A1 (en) * | 2007-12-20 | 2009-07-02 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | A cycling arrangement |
| CH700681A1 (en) * | 2009-03-23 | 2010-09-30 | Rmd Group Ag | Apparatus for transmitting force between a foot and a bicycle pedal and method for measuring a force acting on a bicycle pedal in the direction of the pedal shaft power. |
| WO2010109397A1 (en) * | 2009-03-23 | 2010-09-30 | Rmd Group Ag | Apparatus and method for measuring a force acting on a bicycle pedal in the direction of the pedal shaft |
| WO2010144964A1 (en) * | 2009-06-18 | 2010-12-23 | Power Pedals Pty Ltd | Pedal torque measurement |
| US9150278B2 (en) | 2009-06-18 | 2015-10-06 | Power Pedals Pty Ltd | Pedal torque measurement |
| US8387470B2 (en) | 2009-08-24 | 2013-03-05 | Polar Electro Oy | Pedalling measurement |
| EP2504678A1 (en) | 2009-11-28 | 2012-10-03 | Breakaway Innovations Pty Ltd | Cyclic cranked system method and related devices |
| WO2014184485A1 (en) | 2013-05-14 | 2014-11-20 | Sensix | Bicycle pedal provided with at least one sensor |
| US20200102036A1 (en) * | 2018-09-27 | 2020-04-02 | Bion Inc. | Direct force measurement device for crank |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2724728B1 (en) | 1999-12-24 |
| JPH08145824A (en) | 1996-06-07 |
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