JP-7855379-B2 - control device

JP7855379B2JP 7855379 B2JP7855379 B2JP 7855379B2JP-7855379-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: 20220323
Priority Date: 20211029

Claims (20)

The vehicle is equipped with a control unit that controls the transmission to change the gear ratio when the cadence, which is related to the rotational speed of the crankshaft of a human-powered vehicle, satisfies the gear shifting conditions. The control unit , The gear shift conditions are set such that the gear shift conditions when the vehicle speed of the human-powered vehicle is a first vehicle speed are different from the gear shift conditions when the vehicle speed is a second vehicle speed different from the first vehicle speed . If the cadence exceeds a predetermined cadence range, the transmission is controlled to change the gear ratio. Based on the vehicle speed, the predetermined cadence range is set, The predetermined cadence range is a range that is greater than or equal to the lower limit cadence and less than or equal to the upper limit cadence. A control device in which the lower limit cadence and the upper limit cadence increase as the vehicle speed increases .
The control device according to claim 1 , wherein the control unit sets at least one of the lower limit cadence and the upper limit cadence based on the vehicle speed.
The control device according to claim 2 , wherein at least one of the lower cadence and the upper cadence is set by the user.
The predetermined cadence range includes a reference cadence which is the basis for setting the predetermined cadence range . The control device according to any one of claims 1 to 3 , wherein at least one of the lower limit cadence and the upper limit cadence is set by subtracting or adding a predetermined value to the reference cadence.
The control device according to claim 4 , wherein the reference cadence increases as the vehicle speed increases.
The control device according to claim 4 or 5, wherein the control unit increases the reference cadence by a predetermined increase rate so that the reference cadence becomes the target reference cadence when the target reference cadence set based on the vehicle speed is greater than the reference cadence.
The control unit changes the target reference cadence when the vehicle speed becomes equal to or greater than the first vehicle speed threshold. The control device according to claim 6 , wherein the first vehicle speed threshold includes a plurality of thresholds.
The control device according to any one of claims 4 to 7, wherein the control unit reduces the reference cadence by a predetermined reduction rate so that the reference cadence becomes the target reference cadence when the target reference cadence set based on the vehicle speed is smaller than the reference cadence .
The control unit changes the target reference cadence when the vehicle speed falls below the second vehicle speed threshold. The control device according to claim 8 , wherein the second vehicle speed threshold includes a plurality of thresholds.
The control device according to any one of claims 6 to 9 , wherein the target reference cadence is set by the user.
The control device according to any one of claims 1 to 10 , wherein the vehicle speed is the average vehicle speed over a predetermined period of time.
The control device according to claim 11 , wherein the average vehicle speed is initialized when the cadence is less than or equal to a predetermined cadence.
The control device according to claim 11 or 12, wherein if the acceleration of the human-powered vehicle is greater than or equal to an acceleration threshold, or less than or equal to a deceleration threshold, the average vehicle speed for a predetermined elapsed time after the acceleration becomes greater than or equal to the acceleration threshold, or less than or equal to the deceleration threshold, is maintained at the average vehicle speed before the acceleration becomes greater than or equal to the acceleration threshold, or less than or equal to the deceleration threshold.
The control device according to claim 11 or 12 , wherein the average vehicle speed is calculated based on the vehicle speed when the acceleration of the human-powered vehicle is less than an acceleration determination threshold and greater than a deceleration determination threshold.
The control unit sets the gear shifting conditions based on the vehicle speed when the inclination of the human-powered vehicle is within a predetermined inclination range. The control device according to any one of claims 1 to 14 , wherein the predetermined inclination range includes the inclination when the human-powered vehicle travels on a horizontal road surface.
The control device according to claim 15 , wherein the control unit sets the predetermined cadence range based on the inclination of the human-powered vehicle when the inclination of the human-powered vehicle is outside the predetermined inclination range.
The control device according to claim 16 , wherein the control unit sets the predetermined cadence range to suppress the reduction in the gear ratio when the human-powered vehicle is traveling downhill.
The control device according to any one of claims 1 to 17 , wherein the control unit sets the gear shift conditions according to the vehicle speed and which of the multiple automatic shift modes the automatic shift mode is.
The control unit sets the gear shift conditions according to whether the automatic shift mode is the first mode or a second mode different from the first mode. The control device according to claim 18, wherein the control unit sets the gear conditions such that the gear conditions when the automatic transmission mode is the first mode are different from the gear conditions when the automatic transmission mode is the second mode.
The control unit controls the transmission to change the gear ratio when the cadence exceeds a predetermined cadence range. The predetermined cadence range includes a reference cadence which is the basis for setting the predetermined cadence range . The control device according to claim 19 , wherein the second mode has a reference cadence greater than that of the first mode.

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 first embodiment.Figure 2 is a block diagram showing the electrical configuration of a human-powered vehicle including a control device according to the first embodiment.Figure 3 shows a method for changing the inclination state according to the first embodiment.Figure 4 is a diagram (part 1) showing the predetermined cadence range for each inclination state according to the first embodiment.Figure 5 is a diagram (part 2) showing the predetermined cadence range for each inclination state according to the first embodiment.Figure 6 is a state transition diagram of the driving state of a human-powered vehicle according to the first embodiment.Figure 7 is a flowchart showing an example of the control flow of the control device according to the first embodiment.Figure 8 is a state transition diagram of the vehicle speed state according to the first embodiment.Figure 9 is a diagram showing the relationship between the vehicle speed state and the automatic transmission mode in a human-powered vehicle according to the second embodiment.Figure 10 is a flowchart showing an example of the control flow of the control device according to the second embodiment. (First 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, and may be other bicycles such as road bikes, cross bikes, city bikes, cargo bikes, handcycles, and recumbent bikes, 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 d