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CN-122003362-A - Method for operating a gearshift of a bicycle

CN122003362ACN 122003362 ACN122003362 ACN 122003362ACN-122003362-A

Abstract

The invention relates to a method (50) for operating a gear shifting device (105) of a bicycle (100), comprising the steps of detecting a rotational movement of a rear wheel (111) of the bicycle (100), detecting a rotational movement of a crank-side driven element (102) of the bicycle (100), determining a gear ratio (61) from the rotational movement of the rear wheel (111) and the rotational movement of the driven element (102), determining at least two gear ratios (61) at different points in time within a predetermined time period (63), and identifying the type of construction of the gear shifting device (105) as a continuous gear shifting device if the determined at least two gear ratios (61) deviate from each other by at least one predetermined first gear difference value (66).

Inventors

  • J. Rick

Assignees

  • 罗伯特·博世有限公司

Dates

Publication Date
20260508
Application Date
20240927
Priority Date
20231010

Claims (15)

  1. 1. A method for operating a gear shifting device (105) of a bicycle (100), the method comprising the steps of: detecting a rotational movement of a rear wheel (111) of the bicycle (100), Detecting a rotational movement of a crank-side driven element (102) of the bicycle (100), A gear ratio (61) is determined from the rotational movement of the rear wheel (111) and the rotational movement of the driven element (102), At least two gear ratios (61) are determined at different points in time within a predetermined time period (63), and If the at least two gear ratios (61) determined deviate from each other by at least one predetermined first gear difference value (66), the type of construction of the gear shift device (105) is identified as a continuous gear shift device.
  2. 2. The method according to claim 1, wherein the identification of the structural type of the shifting device (105) is only performed when there is a torque transmission on the drive train of the bicycle (100).
  3. 3. The method according to any of the preceding claims, further comprising the step of: If the at least two gear ratios (61) determined deviate from each other by at least one predetermined second gear difference value (68), the type of construction of the gear shift device (105) is recognized as a discontinuous gear shift device, wherein the second gear difference value (68) is a multiple of the first gear difference value (66).
  4. 4. A method according to any of the preceding claims, wherein the first gear difference value (66) corresponds to a gear ratio change of at least 0.5%, and preferably a maximum of 3%.
  5. 5. The method according to any of the preceding claims, wherein the predetermined period of time (63) is at least 0.5 seconds, preferably at most 1 second.
  6. 6. The method according to any of the preceding claims, further comprising the step of: determining the absolute average relative difference between two gear ratios (61) determined one after the other, and And calculating a relative average gear ratio based on the absolute average relative difference value.
  7. 7. The method of claim 6, further comprising the step of: A reference gear ratio is calculated as an average value of the plurality of gear ratios (61) calculated, Determining a first difference between the reference gear ratio and the currently determined gear ratio (61), and If the first difference is a multiple of the relative average gear ratio, the counter count is incremented.
  8. 8. The method according to claim 6 or 7, further comprising the step of: an absolute average gear ratio is calculated based on the calculated plurality of gear ratios (61), Determining a second difference between the absolute average gear ratio and the current determined gear ratio (61), and If the second difference is a multiple of the relative average gear ratio, the counter count is incremented.
  9. 9. The method according to claim 7 or 8, comprising the steps of: if the counter reaches or exceeds a predefined value, the type of construction of the gear shift device (105) is identified as a continuous gear shift device.
  10. 10. The method according to any of the preceding claims, further comprising the step of: Based on the determined gear ratio (61), a gear ratio change, in particular a gear ratio change caused by a gear shift process, is detected.
  11. 11. Method according to any of the preceding claims, wherein the rotational movement of the rear wheel (111) is detected by means of a speed sensor and/or by means of a rotational speed sensor.
  12. 12. The method according to any of the preceding claims, wherein the rotational movement of the crank-side driven element (102) is detected by means of a beat sensor and/or by means of a motor speed sensor.
  13. 13. The method according to any of the preceding claims, wherein the identification of the structural type of the shifting device (105) is performed only when each freewheel in the drive system of the bicycle (100) is closed and/or there is a torque transmission via the shifting device (105).
  14. 14. A gear shifting system of a bicycle (100) comprising a gear shifting device (105) and a control unit (106), wherein the control unit (106) is arranged for performing the method (50) according to any of the preceding claims.
  15. 15. Bicycle, in particular electric bicycle, comprising a gear shifting system (107) according to claim 14.

Description

Method for operating a gearshift of a bicycle Technical Field The present invention relates to a method for operating a gearshift of a bicycle, a gearshift system of a bicycle and a bicycle. Background Shift systems for bicycles are known, which can have discontinuous gear positions, as for example in chain shifting devices with several differently sized sprockets. Furthermore, several gear shifting systems with continuously variable transmission ratios are known. In particular, when used in electric bicycles, there are often functions, such as software functions, which are operated according to the type of gear shifting device. In general, the type of gear change device is known and the current gear ratio is determined. Disclosure of Invention The method according to the invention with the features of claim 1 is characterized in that the exact information about the gear change can be ascertained in a simple and reliable manner. In particular, the type of construction of the shifting device can be determined in a simple manner and automatically on any bicycle. According to the invention, this is achieved by a method for operating a gearshift of a bicycle, preferably an electric bicycle, comprising the steps of: The rotational movement of the rear wheel of the bicycle is detected, Detecting a rotational movement of a crank-side driven member of the bicycle, The gear ratio is determined from the rotational movement of the rear wheel and the rotational movement of the driven element, At least two gear ratios are determined at different time points and within a predetermined time period, and If the at least two determined gear ratios deviate from each other by at least one predetermined first gear difference, the type of construction of the shifting device is identified as a continuous shifting device. Preferably, the rotational speed and/or the angular speed are detected as a rotational movement. The crank-side driven element is preferably engaged with a transmission element which enables torque transmission from the driven element to the rear wheel of the bicycle. The transfer element may be, for example, a chain or a belt. The crank-side driven element may preferably be a sprocket. A continuously variable transmission is considered to be a transmission which is capable of providing a continuously variable transmission ratio. This means that every arbitrary gear ratio can be set in the gear ratio range. The first gear difference is regarded in particular as the difference between the two determined gear ratios. In other words, a method is provided in which the rotational movement of the rear wheel and the rotational movement of the crank-side driven element are correlated to each other to determine the gear ratio. In this case, at least two gear ratios determined during the predetermined time period are compared with one another. If the respectively determined deviation between the two gear ratios is greater than or equal to the predetermined first gear difference value, the shift device is recognized as a continuous shift device in response thereto. In particular, the recognition is based on the fact that only continuous shifting devices allow incremental small changes in the gear ratio, whereas, for example, only discontinuous shifting devices allow large changes in a very short time frame. In particular, discontinuous shifting devices do not allow incremental small changes in the gear ratio within a short period of time. Thus, by detecting the rotational movement of the rear wheel and the crank-side driven element, the influence of the changing gear ratio is detected clearly and in a simple manner. The method thus offers the advantage that a particularly simple possibility is provided for automatically determining the type of construction of the gear change device. The method can be used on any bicycle. Thus, in particular when used on an electric bicycle, which for example has a function based on the type of gear change, in particular a software function, such as a speed estimation, which is performed based on, in particular, the estimated current gear ratio, a particularly simple and reliable operation of such a function can advantageously be provided. For example, the type of the shifting device does not have to be programmed or set manually in advance. The dependent claims contain advantageous developments of the invention. Preferably, a plurality of gear ratios, in particular more than two gear ratios, are determined at different points in time, wherein the type of construction of the gear shift device is identified on the basis of the plurality of gear ratios. In particular, if an incremental change of the gear ratio is determined over time by means of the plurality of gear ratios, the type of construction of the gear shift device is identified as a continuous gear shift device. Preferably, the gear ratio is continuously monitored over time, for example continuously over time or at discrete points in