JP-7855331-B2 - control device

JP7855331B2JP 7855331 B2JP7855331 B2JP 7855331B2JP-7855331-B2

Inventors

山口遼太
田河賢治
荒井雅史

Assignees

株式会社シマノ

Dates

Publication Date: 20260508
Application Date: 20211029

Claims (7)

The system includes a control unit that controls the transmission to change the gear ratio when the state variables related to the drive of a human-powered vehicle satisfy the gear shift conditions. The control unit, when the vibration state of the human-powered vehicle is in a first vibration state, sets the gear shift condition according to the inclination detected by the inclination sensor, and when the set gear shift condition is met, controls the transmission to change the gear ratio. A control device that, when the vibration state is a second vibration state different from the first vibration state, sets the gear shift condition regardless of the inclination, and controls the transmission to change the gear ratio when the set gear shift condition is met.
The system includes a control unit that controls the transmission to change the gear ratio when the state variables related to the drive of a human-powered vehicle satisfy the gear shift conditions. The control unit, when the vibration state of the human-powered vehicle detected by the acceleration sensor is a first vibration state, sets the gear shift condition according to the inclination detected by the acceleration sensor, and when the set gear shift condition is met, controls the transmission to change the gear ratio. A control device that, when the vibration state is a second vibration state different from the first vibration state, sets the gear shift condition regardless of the inclination, and controls the transmission to change the gear ratio when the set gear shift condition is met.
The control unit, If the aforementioned inclination is in the first inclination state, the gear shift condition is set to the first gear shift condition. If the inclination is a second inclination state different from the first inclination state, the gear shift condition is set to a second gear shift condition different from the first gear shift condition. The control device according to claim 1, wherein if the vibration state is the second vibration state, the gear shift condition is set to the first gear shift condition even if the inclination is the second inclination state.
The control device according to claim 3, wherein the first inclination state has a smaller inclination than the second inclination state.
The control device according to any one of claims 1 to 4, wherein the vibration of the human-powered vehicle is greater in the second vibration state than in the first vibration state.
The aforementioned vibration state is the condition of the road surface on which the human-powered vehicle is traveling. The control device according to any one of claims 1 to 5 , wherein the second vibration state includes the vibration state on at least one road surface of cobblestone and an unpaved road.
The control device according to any one of claims 1 to 6 , wherein the state variable is cadence.

Description

This disclosure relates to a control device. Patent Document 1 discloses a control device for automatically selecting the gear ratio of a gear shift device installed in a bicycle. Japanese Patent Publication No. 2019-202733 Figure 1 is a side view of a human-powered vehicle equipped with a control device according to the embodiment.Figure 2 is a block diagram showing the electrical configuration of a human-powered vehicle including a control device according to an embodiment.Figure 3 shows a method for changing the inclination state according to the embodiment.Figure 4A is a diagram (part 1) showing the predetermined cadence range for each inclination state according to the embodiment.Figure 4B is a diagram (part 2) showing the predetermined cadence range for each inclination state according to the embodiment.Figure 5 is a flowchart showing an example of the control flow for gear shift control in the control device according to the embodiment.Figure 6 is a flowchart (part 1) showing an example of the control flow for setting the vibration state in the control device according to the embodiment.Figure 7 is a flowchart (part 2) showing an example of the control flow for setting the vibration state in the control device according to the embodiment. As shown in Figure 1, the human-powered vehicle 10 is, for example, a mountain bike. The human-powered vehicle 10 is not limited to a mountain bike; it may be any other bicycle, such as a road bike, hybrid bike, city bike, cargo bike, handcycle, or recumbent bicycle, as long as it can be driven by human power at least. The human-powered vehicle 10 may be a single-wheeled vehicle or a vehicle with three or more wheels. The human-powered vehicle 10 may be equipped with an electric drive unit. The electric drive unit is configured to assist in the propulsion of the human-powered vehicle 10. In the following, the human-powered vehicle 10 may be described using a Cartesian coordinate system with X, Y, and Z axes. The X-axis corresponds to the front-to-back direction of the human-powered vehicle 10. The Y-axis corresponds to the left-to-right direction of the human-powered vehicle 10. The Z-axis corresponds to the up-to-down direction of the human-powered vehicle 10. The human-powered vehicle 10 includes a frame 12. The frame 12 includes, for example, a head tube 12A, a top tube 12B, a down tube 12C, a seat stay 12D, and a chain stay 12E. The human-powered vehicle 10 also includes a front fork 12F, a stem 12G, and a handlebar 12H. The front fork 12F and stem 12G are connected to the head tube 12A. The handlebar 12H is connected to the stem 12G. The human-powered vehicle 10 also comprises wheels 14, a drivetrain 16, and a gear shifting system 18. The wheels 14 include a front wheel 14A and a rear wheel 14B. The front wheel 14A is connected to the front fork 12F. The rear wheel 14B is connected to the connection points of the seat stay 12D and the chain stay 12E. The drivetrain 16 is configured to transmit human power to the rear wheel 14B. The drivetrain 16 includes a pair of pedals 20, a crank 22, a front chainring 24, a chain 26, and a rear sprocket 28. When the crank 22 rotates due to the human power applied to the pair of pedals 20, the front chainring 24 rotates. The rotational force of the front chainring 24 is transmitted to the rear sprocket 28 via the chain 26. The rotation of the rear sprocket 28 causes the wheel 14 to rotate. The rear sprocket 28 includes multiple sprockets, each with a different number of teeth. The drivetrain 16 may include pulleys and a belt instead of the front chainwheel 24, rear sprocket 28, and chain 26, and may also include bevel gears and shafts. The crank 22 includes a first crank arm connected to the first axial end of the crankshaft and a second crank arm connected to the second axial end of the crankshaft. The drivetrain 16 may include other components such as a one-way clutch, other sprockets, or other chains. The front chainwheel 24 may include multiple chainwheels. Preferably, the axis of rotation of the front chainwheel 24 is coaxial with the axis of rotation of the crank 22. The axis of rotation of the rear sprocket 28 is coaxial with the axis of rotation of the rear wheel 14B. The gear shifting system 18 includes a control device 30 and a gear shifter 32. The control device 30 is, for example, mounted on the frame 12. The control device 30 may also be housed in the downtube 12C. The control device 30 may also be mounted on the gear shifter 32. The control device 30 operates using power supplied from the battery 34. The gear shifter 32 is located in the transmission path for human-powered driving force. The transmission path for human-powered driving force is the path from the human-powered driving force applied to the pedals 20 to the wheels 14. The gear shifter 32 includes an external derailleur. The gear shifter 32 includes, for example, a rear derailleur 36. The gear shifter 32 may also include a front derailleur. In this e