# US 2023/0053529 A1 · Crank spindle set-up, control and/or evaluation method and unit for a crank spindle set-up, and vehicle

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- Number: US 2023/0053529 A1
- Document ID: US20230053529A1
- Status: Published application
- Kind: A1
- Application number: 17/886,510
- Filed: 2022-08-12
- Published: 2023-02-23
- Earliest claimed: 2021-08-18
- Assignees: Robert Bosch GmbH
- Applicants: Robert Bosch GmbH
- Inventors: Michael Zegowitz; Christoph Ossmann; Frank Schatz
- Web page: https://patentgrep.com/patent/US20230053529A1

## CPC

- B62J 45/411: Torque sensors
- B62M 6/50: characterised by detectors or sensors, or arrangement thereof
- B62J 45/421: at the pedal crank
- B62M 3/00: Construction of cranks operated by hand or foot
- B62M 6/55: power-driven at crank shafts parts
- 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
- B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16)

## Abstract

A crank spindle set-up for a vehicle. The set-up includes a crank spindle for receiving a force/torque from pedaling using crank arms attached to ends of the crank spindle; an output shaft for receiving a force and/or a torque from the crank spindle; a mechanical coupling having a tap between the ends of the crank spindle, for transmitting force/torque from the crank spindle to the output shaft; a first magnetic region on/in the output shaft for generating and outputting a first magnetic field that is a function of the state of mechanical stress of the output shaft; a second magnetic region on/in the crank spindle at an axial distance from the tap, for generating and outputting a second magnetic field that is a function of the state of mechanical stress of the crank spindle; and a sensor set-up for detecting a magnetic field outputted by the crank spindle set-up.

## Claims

### Claim 1

A crank spindle set-up for a vehicle capable of being propelled by muscle power and additionally by motor power, the crank spindle set-up comprising:
a crank spindle configured to receive a force and/or a torque from pedaling using crank arms attached to ends of the crank spindle;
an output shaft configured to receive a force and/or a torque from the crank spindle;
a mechanical coupling having a tap between the ends of the crank spindle, configured to transmit force and/or torque from the crank spindle to the output shaft;
a first magnetic region on and/or in the output shaft configured to generate and output a first magnetic field that is a function of the state of mechanical stress of the output shaft;
a second magnetic region on and/or in the crank spindle at an axial distance from the tap of the mechanical coupling, configured to generate and output a second magnetic field that is a function of the state of mechanical stress of the crank spindle; and
a sensor set-up configured to detect a magnetic field output by the crank spindle set-up.

### Claim 2 (depends on 1)

The crank spindle set-up as recited in claim 1, wherein the vehicle is an electric bicycle, or an e-bike, or a pedelec.

### Claim 3 (depends on 1)

The crank spindle set-up as recited in claim 1, wherein the output shaft:
is configured with or takes the form of a hollow shaft; and/or
is formed coaxially to the crank spindle; and/or
surrounds the crank spindle partially, or completely, or substantially completely, and overlaps it in a common axial direction to form an axial, spatial overlap region.

### Claim 4 (depends on 1)

The crank spindle set-up as recited in claim 1, wherein in a common axial direction, the first magnetic region and the second magnetic region spatially overlap partially, completely, or substantially completely to form a spatial magnetic overlap region.

### Claim 5 (depends on 4)

The crank spindle set-up as recited in claim 4, wherein the sensor set-up is formed partially, completely, or substantially completely in the magnetic overlap region, in the common, axial direction.

### Claim 6 (depends on 1)

The crank spindle set-up as recited in claim 1, wherein the first magnetic region and the second magnetic region are configured to generate the second magnetic field in the circumferential direction of the crank spindle as a function of angle and to output it: (i) in the form of positional and/or angular coding, and/or (ii) in accordance with a number, and/or set-up, and/or distribution and/or geometric shape of magnetic sections of the second magnetic region.

### Claim 7 (depends on 1)

The crank spindle set-up as recited in claim 1, wherein:
the sensor set-up includes a plurality of sensors; and/or
the first magnetic region includes a corresponding plurality of magnetic sections spatially set apart from each other in the axial direction; and/or
a number of the sensors corresponds to a number of magnetic sections; and/or
the sensors and the magnetic sections are aligned in one-to-one correspondence with each other in an axial direction of the output shaft and/or spatially overlap partially, or completely, or substantially completely in their correspondence; and/or
the second magnetic region is an individual, niform, and/or simply coherent region, which spatially overlaps all of the magnetic sections and/or all of the sensors partially, or completely, or substantially completely in the common axial direction.

### Claim 8

A control and/or evaluation method for a crank spindle set-up and its operation, the crank spindle set-up including:
a crank spindle configured to receive a force and/or a torque from pedaling using crank arms attached to ends of the crank spindle,
an output shaft configured to receive a force and/or a torque from the crank spindle,
a mechanical coupling having a tap between the ends of the crank spindle, configured to transmit force and/or torque from the crank spindle to the output shaft,
a first magnetic region on and/or in the output shaft configured to generate and output a first magnetic field that is a function of the state of mechanical stress of the output shaft,
a second magnetic region on and/or in the crank spindle at an axial distance from the tap of the mechanical coupling, configured to generate and output a second magnetic field that is a function of the state of mechanical stress of the crank spindle, and
a sensor set-up configured to detect a magnetic field output by the crank spindle set-up;
the method comprising the following steps:
acquiring and recording a time characteristic of a signal measured by the sensor set-up;
recognizing sections between two directly consecutive minima in the characteristic of the signal as half phases of the signal;
recognizing, half phases of the signal, whose signal values are shifted to greater absolute values in comparison with half phases directly adjacent in time, as caused by one side of the crank arm and correspondingly rating the half phases as “right” or “left,” on a side of which the second magnetic region of the crank arm is formed relative to the mechanical coupling, each of the half phases being recognized and rated as “left” and/or “right”; and
generating for a device to be controlled with regard to the signal measured currently by the sensor set-up a control signal for a current “right” half phase and/or for a current “left” half phase, and outputting the control signal to the device for its control.

### Claim 9 (depends on 8)

The control and/or evaluation method as recited in claim 8, wherein a specific control signal is:
representative of a value of the torque applied to the crank spindle; and/or
generated as a current and time-dependent signal and/or as a signal corresponding to a current characteristic of the signal measured by the sensor set-up; and/or
generated as a control signal for controlling a motor drive unit of a vehicle;
generated as a control signal for storing a value in a storage device; and/or
generated as a control signal for controlling an acoustic, haptic and/or optical indicator.

### Claim 10

A control and/or evaluation unit for a crank spindle set-up the crank spindle set-up including:
a crank spindle configured to receive a force and/or a torque from pedaling using crank arms attached to ends of the crank spindle,
an output shaft configured to receive a force and/or a torque from the crank spindle,
a mechanical coupling having a tap between the ends of the crank spindle, configured to transmit force and/or torque from the crank spindle to the output shaft,
a first magnetic region on and/or in the output shaft configured to generate and output a first magnetic field that is a function of the state of mechanical stress of the output shaft,
a second magnetic region on and/or in the crank spindle at an axial distance from the tap of the mechanical coupling, configured to generate and output a second magnetic field that is a function of the state of mechanical stress of the crank spindle, and
a sensor set-up configured to detect a magnetic field output by the crank spindle set-up;
the control and/or evaluation unit configured to:
acquire and record a time characteristic of a signal measured by the sensor set-up;
recognize sections between two directly consecutive minima in the characteristic of the signal as half phases of the signal;
recognize, half phases of the signal, whose signal values are shifted to greater absolute values in comparison with half phases directly adjacent in time, as caused by one side of the crank arm and correspondingly rating the half phases as “right” or “left,” on a side of which the second magnetic region of the crank arm is formed relative to the mechanical coupling, each of the half phases being recognized and rated as “left” and/or “right”; and
generating for a device to be controlled with regard to the signal measured currently by the sensor set-up a control signal for a current “right” half phase and/or for a current “left” half phase, and outputting the control signal to the device for its control.

### Claim 11

A vehicle capable of being propelled by muscle power and additionally by motor power, and which is configured with a drive unit, the vehicle comprising:
a crank spindle set-up including:
a crank spindle configured to receive a force and/or a torque from pedaling using crank arms attached to ends of the crank spindle;
an output shaft configured to receive a force and/or a torque from the crank spindle;
a mechanical coupling having a tap between the ends of the crank spindle, configured to transmit force and/or torque from the crank spindle to the output shaft;
a first magnetic region on and/or in the output shaft configured to generate and output a first magnetic field that is a function of the state of mechanical stress of the output shaft;
a second magnetic region on and/or in the crank spindle at an axial distance from the tap of the mechanical coupling, configured to generate and output a second magnetic field that is a function of the state of mechanical stress of the crank spindle; and
a sensor set-up configured to detect a magnetic field output by the crank spindle set-up.