TWM518767U - Bicycle tread frequency sensing device - Google Patents

Description

Bicycle cadence sensing device

The present invention provides a cadence sensing device installed on a bicycle, which uses an acceleration sensor to detect an acceleration value when the bicycle pedal is stepped on. According to the principle of simple harmonic motion, the processing unit judges the period of pedal depression, and then calculates the minute. The number of revolutions of the pedal is transmitted to the electronic device via the wireless communication circuit, and the cadence of the pedal is displayed by the screen.

At present, the cadence sensor used in bicycles mainly utilizes the principle of electromagnetic induction, which is mostly composed of a magnet (such as a magnet, a reed, etc.) and an inductor (such as a Hall element, a sensing coil, etc.), and the magnet is mounted. On the crank of the bicycle, and the sensor is mounted on the frame (such as the seat stay), the sensor can be used to detect the number of revolutions per minute that the magnet passes through the sensor as the crank rotates continuously. In order to complete the pedal frequency detection action of the pedal, the cadence sensor needs precise alignment between the magnet and the two separate components of the sensor to detect the data of the cadence, so that the magnet must be close to the induction The position of the device is installed and the sensor can reliably detect the passage of the magnet. However, the magnet and the sensor are mostly mounted on the corresponding positions of the bicycle by the strap or the buckle, so that the bicycle is easily shocked during the riding process. The influence of external force such as impact causes the position between the magnet and the sensor to shift, and affects the stability of the data detection, and needs to be re-corrected and adjusted. Person in distress on the training and riding, is the key to being anxious to be engaged in research of this industry are improving.

The present invention provides a body mounted on a bicycle pedal. The body has an acceleration sensor, a processing unit and a wireless communication circuit, and is connected with a power supply. The power supply can be a button battery to reduce the occupied volume. The main body can be easily installed on the pedal without being aligned, and the integrated stepping function is not affected. The original pedaling function is not affected by the vibration or other external force during application, and the cadence calculation is not affected. Ensure the function and effect of the overall use.

The secondary purpose of this creation is to use the acceleration sensor of the body to detect the acceleration value when the pedal is stepped on. According to the physical principle of the acceleration change in the simple harmonic motion, the processing unit determines the periodic change of the acceleration rise and fall, and calculates the minute. The number of revolutions of the pedal, and then the wireless communication circuit is used to transmit the data to the electronic device, and the cadence of the pedal is displayed by the screen.

Another purpose of the creation is that the processing unit interprets the pedal to complete a motion cycle, and first calculates the average acceleration value in the motion to read the acceleration value from large to small or from small to large to span the average acceleration value. The time is a period of motion, so as to avoid the change of the acceleration peak due to the change of the rotation speed or the pedal in the riding, and the reading error is generated.

A further object of the present invention is that the processing unit updates the average acceleration value after each cycle is detected, and judges whether the pedal is stepped on by the change of the polarity and magnitude of the acceleration vector.

Another object of the present invention is that the external body type can be a bicycle pedal, a pedal reflector or integrated with a bicycle crank to maintain overall aesthetics.

Another purpose of this creation is the wireless communication circuit of the body and the display of the cadence The sub-device is a mobile phone or wireless bicycle code table using a communication protocol of Bluetooth, ANT or ANT+, and provides convenience for the user.

1‧‧‧ Ontology

11‧‧‧Acceleration sensor

12‧‧‧Processing unit

13‧‧‧Wireless communication circuit

14‧‧‧Power supply

111‧‧‧System Single Chip

2‧‧‧Electronic devices

21‧‧‧ screen

3‧‧‧Bicycle

4‧‧‧Crest

5‧‧‧Average acceleration value

6 ‧ ‧ cycle

The first picture is a block diagram of the creation.

The second figure is a schematic diagram of the creation of the bicycle pedal.

The third figure is a state diagram of the use of the preferred embodiment of the present invention.

The fourth picture is the waveform of the acceleration of the creation.

The fifth picture is the waveform analysis diagram of the creation acceleration

In order to achieve the above objectives and effects, the technical means and its construction adopted in the present invention are described in detail in the preferred embodiment of the present invention, and the structure and function are as follows.

Please refer to the first and second figures, which are the block diagram of the creation and the schematic diagram of the bicycle pedal. It can be clearly seen from the figure that the detection method of the bicycle pedal frequency is to utilize the body 1 and the electronic device 2 Therefore, the main components and features of the present invention are as follows: wherein the body 1 and the pedals on the bicycle 3 are preferably integrated directly into one body, but in practice, the body 1 can also be integrated into the pedals. The inside of the reflector 1 (not shown) is installed and used as a bicycle accessory, or the body 1 can be further mounted on the pedal, the inside or the outside of the crank by using the positioning member of the outer casing, and the inside of the body 1 has An acceleration sensor 11 is connected by the acceleration sensor 11 The processing unit 12 is connected to the wireless communication circuit 13 for transmitting data to the electronic device 2 for receiving, and the power sensor 14 is connected to the acceleration sensor 11, the processing unit 12 and the wireless communication circuit 13, and The power supply 14 can be a button battery, a lithium battery, a dry battery or other power source that can supply electric energy. The button battery can reduce the occupied volume and make the body 1 more compact.

Preferably, the electronic device 2 can be a bicycle code table or can be smart. A mobile phone, a smart bracelet or a watch, a personal digital assistant (PDA) or other terminal device, and the electronic device 2 has a screen 21 and has an associated application built therein, which can display the body by the screen 21 by wireless transmission. 1 The result of the test is convenient for the user to quickly grasp the cadence information when riding the bicycle 3 through the electronic device 2, which helps to timely adjust the rhythm and intensity of the pedaling, and also maintains the physical stability and improves the riding efficiency. It tends to be practical.

However, the body 1 described above is preferably implemented by the processing unit 12 for reading plus The acceleration value of the speed sensor 11 is processed, and the cadence data of the pedal is stepped on in real time, but in actual application, it can be directly transmitted to the electronic device 2 through the wireless communication circuit 13 without calculation. Receiving and processing by the electronic device 2 application to obtain the cadence data, and the processing unit 12 and the wireless communication circuit 13 of the main body 1 can also be integrated into a system single chip (SoC) 111, so that the overall circuit design Reduction and modularization, and reducing the space and volume occupying the inside of the body 1, and the wireless communication circuit 13 of the body 1 and the wireless transmission protocol used by the electronic device 2 are Bluetooth, ANT, ANT+, or Develop a wireless transmission protocol common to other electronic devices 2.

Please refer to the third figure, a state diagram of the use of the preferred embodiment of the present invention. When pedaling When stepping, the acceleration sensor 11 of the body 1 measures at least one axial direction (such as the Z axis in the third figure). The acceleration value is obtained by the processing unit 12 according to the acceleration value, and the waveform of the acceleration as shown in the fourth figure is obtained, wherein the horizontal axis is time (t) and the vertical axis is acceleration (A), and the pedal is generated every revolution. There is a corresponding period of acceleration value.

As shown in the waveform diagram of the acceleration diagram in the fourth figure, the peak size 4 will be due to the pedaling frequency. As the speed becomes larger and larger, the processing unit 12 first calculates the average acceleration value 5 in the motion, as shown in the waveform analysis diagram of the fifth graph acceleration, which is located in the middle portion of the waveform, and reads the acceleration value from large to small, or The time required to cross the average acceleration value 5 from small to large is a motion period of 6, which avoids the change in the acceleration peak when the speed is changed and the pedal is reversed when the time between the two peaks is determined. Generated a mistake in interpretation.

The cadence per minute (RPM) is calculated by the formula "(1 ÷ exercise cycle seconds) × 60" is calculated.

As shown in the waveform analysis diagram of the acceleration diagram of the fifth figure, the processing unit 12 will be each After the secondary acceleration value crosses the average acceleration value 5 from large to small, the average acceleration value of this period 6 is recalculated as the reference standard for the next period.

It can be clearly seen from the above-mentioned implementation steps that the stepping frequency of the pedal is stepped on When the material is transferred, the number of revolutions of the pedal is converted into a cadence per minute, and the wireless communication circuit 13 encodes according to the communication protocol used in the above embodiment [0014], and then transmits it to the electronic device 2 for reception, thereby enabling the screen. 21 Instantly display the cadence data.

The above detailed description is intended to be illustrative of a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalents and modifications may be made without departing from the spirit of the invention. Changes are to be included in the scope of patents covered by this creation.

1‧‧‧ Ontology

11‧‧‧Acceleration sensor

12‧‧‧Processing unit

13‧‧‧Wireless communication circuit

14‧‧‧Power supply

111‧‧‧System Single Chip

2‧‧‧Electronic devices

21‧‧‧ screen

Claims (10)

A bicycle cadence sensing device utilizes an acceleration sensor of a body, the sensor is connected to a processing unit, and a wireless communication circuit is connected by the processing unit to transmit data to the external electronic device to display the cadence The data is detected by the acceleration value of the acceleration sensor, and the number of times the acceleration waveform crosses the previous acceleration average line to the second half from the upper half of the cycle is the cadence. The bicycle cadence sensing device according to claim 1, wherein the body is directly integrated with the pedal of the bicycle. The bicycle cadence sensing device according to claim 1, wherein the body is mounted inside the reflector for integration on the bicycle pedal by means of an accessory. The bicycle cadence sensing device according to claim 1, wherein the body is a pedal, a crank or an exterior of the bicycle that is further mounted on the bicycle by using a positioning member of the outer casing. The bicycle cadence sensing device according to claim 1, wherein the processing unit of the body and the wireless communication circuit are integrated system single-chips. The bicycle cadence sensing device according to claim 1, wherein the acceleration sensor, the processing unit and the wireless communication circuit of the main body are connected with a power supply, and the power supply is a button battery, a lithium battery or dry cell. The bicycle cadence sensing device according to claim 1, wherein the electronic device is a mobile phone with wireless transmission function to display cadence data transmitted by the body. The bicycle cadence sensing device according to claim 1, wherein the electronic device is a wireless bicycle code table to display cadence data transmitted by the body. The bicycle cadence sensing device according to claim 1, wherein the wireless communication protocol used by the wireless communication circuit and the electronic device of the main body is a Bluetooth protocol. The bicycle cadence sensing device according to claim 1, wherein the body is wireless The wireless transmission protocol used by communication circuits and electronic devices is ANT or ANT+.