TWI754791B - bicycle watch device - Google Patents

Abstract

A bicycle watch device includes a casing, wherein an air inlet opening is formed on the casing, and a cavity is arranged inside the casing, and a circuit board with an air pressure sensor is integrated into the cavity, Therefore, when the external air enters through the air inlet opening, it can slowly diffuse into the cavity. In addition, the air pressure sensing element can be arranged in the open space on one side of the cavity to reduce the fluctuation of air pressure value caused by direct wind blowing. situation happens.

Description

bicycle watch device

The present invention relates to a bicycle watch device, especially an electric meter with an air pressure sensing function, and the structure of the electric meter can prevent the airflow from blowing directly into the sensing area, so it can reduce the detected air pressure value caused by airflow disturbance. The effect of ups and downs.

In recent years, it is very popular to use bicycles as a tool for sports and transportation. Some users will install a bicycle watch on the handlebar of the bicycle to record the mileage, speed and other parameters as a reference during exercise. In addition, the above bicycle watch can also have a satellite navigation function to guide the user's route.

However, it is difficult to combine the barometer with the car watch. Since the barometric pressure sensor is a sensor that is easily affected by the external environment, the detection value fluctuates greatly, such as riding a bicycle. Tailwind, headwind, and wind shear caused by up and down slopes may cause the barometric sensor to detect additional values, resulting in overestimation or underestimation in the calculation of altitude, potential energy and power Therefore, there are certain difficulties to be overcome to apply the barometer to the car watch.

Therefore, in this case, an independent cavity is designed inside the car watch, and the inner diameter of the independent cavity and an opening is not smaller than the outer diameter to reduce the chance of wind blowing into the car watch, and the air pressure sensing element is arranged in the independent cavity. One side of the open space, in order to reduce the fluctuation of the air pressure value caused by the direct wind, this should be an optimal solution.

A bicycle watch device comprises: a casing; an air inlet opening formed on the surface of the casing; a cavity, which is arranged in the casing, wherein the cavity is equipped with an air pressure sensor The circuit board of the circuit board, the air pressure sensor on the circuit board is used to measure the air pressure value of the surrounding air; a first intake channel is set in the casing, and the first intake channel is connected with the The cavity is communicated with the air inlet opening.

More specifically, the cavity has a sensing area and an air intake area, the air pressure sensor is located in the sensing area, and the air intake area is communicated with the first air intake passage , so that the air flow entering through the air inlet opening can enter the air intake area through the first air intake channel, and then diffuse into the sensing area from the air intake area.

More specifically, the air pressure sensor on the circuit board only detects the air pressure value in the sensing area, and does not directly contact the air pressure value entering through the air inlet opening.

More specifically, the spatial size of the sensing area is greater than or equal to the intake area.

More specifically, a second air intake passage is further provided inside the cavity, and the second air intake passage is communicated with the cavity and the first air intake passage, so as to be able to guide the first air intake from the cavity. The air flow into the channel.

More specifically, the width of the inner diameter of the second intake passage is greater than or equal to the width of the inner diameter of the first intake passage.

More specifically, the diameter of the air inlet opening is smaller than or equal to the opening width of the first air inlet passage.

More specifically, the circuit board further includes a central control unit, a height An analysis unit and a single energy analysis unit, wherein the central control unit is connected with the air pressure sensor, the altitude analysis unit and the potential energy analysis unit, and the central control unit receives the air pressure value detected by the air pressure sensor Then, the corresponding height can be converted by the height analysis unit, and the potential energy analysis unit can analyze the potential energy change and power.

1: Shell

11: Cavity

111: Intake area

112: Sensing area

12: Air inlet opening

13: The first intake passage

14: Second intake passage

15: circuit board

151: Air pressure sensor

152: Central control unit

153: Height Analysis Unit

154: Potential Energy Analysis Unit

16: Screen

2: Bicycle

3: Rider

4: Airflow

[Fig. 1] is a schematic diagram of the external structure of the first embodiment of the bicycle watch device of the present invention.

[Fig. 2A] is a schematic diagram of the internal cross-sectional structure of the first embodiment of the bicycle watch device of the present invention.

[Fig. 2B] is a schematic diagram of the internal cross-sectional structure of the second embodiment of the bicycle watch device of the present invention.

[Fig. 2C] is a schematic diagram of the internal cross-sectional structure of the third embodiment of the bicycle watch device of the present invention.

[Fig. 2D] is a schematic diagram of the internal cross-sectional structure of the fourth embodiment of the bicycle watch device of the present invention.

[Fig. 3] is a schematic diagram of the circuit board structure of the bicycle watch device of the present invention.

[Fig. 4A] is a schematic diagram of the implementation of the riding air intake of the bicycle watch device of the present invention.

[FIG. 4B] is a schematic diagram of the implementation of the airflow of the bicycle watch device of the present invention.

[Fig. 5] is a schematic diagram of the analysis of the air pressure value and the corresponding altitude of the bicycle watch device of the present invention.

[Fig. 6] is a schematic diagram of the potential energy change and potential energy analysis of the bicycle watch device of the present invention.

[Fig. 7] is a schematic diagram of the external structure of the fifth embodiment of the bicycle watch device of the present invention.

Other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings.

Please refer to Figures 1, 2A, 2B, 2C and 2D, which are a schematic diagram of the external structure of the first embodiment, the schematic diagram of the internal cross-sectional structure of the first embodiment, the schematic diagram of the internal cross-sectional structure of the second embodiment, and the schematic diagram of the internal cross-sectional structure of the third embodiment of the bicycle watch device of the present invention. And the schematic diagram of the internal cross-sectional structure of the fourth embodiment, wherein the bicycle watch device includes a casing 1, an air inlet opening 12 is provided at the edge surface of the casing 1, and the casing 1 has a cavity 11 and A first air intake channel 13 , wherein the diameter of the air intake opening 12 is smaller than or equal to the opening width of the first air intake channel 13 .

Inside the cavity 11 is a circuit board 15 having an air pressure sensor 151. The air pressure sensor 151 on the circuit board 15 is used to measure the air pressure of the surrounding airflow, and the cavity 11 extends inward There is a second intake passage 14, and the second intake passage 14 is used to guide the airflow entered by the first intake passage 13; and as shown in FIG. 2A, the second intake passage 14 is The inner diameter width can be larger than the inner diameter width of the first air intake passage 13 , but also as shown in FIG. 2B , the inner diameter width of the second air intake passage 14 can be designed to be equal to the inner diameter of the first air intake passage 13 . In addition, as shown in FIG. 2C, the second air intake channel 14 can be not provided, and the airflow entering from the first air intake channel 13 can directly contact the interior of the cavity 11 .

The cavity 11 has a sensing area 112 and an air intake area 111 , the air pressure sensor 151 is located in the sensing area 112 , and the air intake area 111 is connected to the first air intake passage 13 The air flow entering through the air inlet opening 12 can enter the air intake area 111 through the first air intake passage 13 and then diffuse into the sensing area 112 from the air intake area 111 .

As shown in the figure, the space of the sensing area 112 is larger than the space of the air intake area 111 , and the air flow in the air intake area 111 can slowly spread to the sensing area 112 , so the sensing area 112 The air flow above will not be too disturbed, the purpose is to make the sensing area 112 close to the outside atmospheric pressure, so the air pressure sensor 151 only needs to detect the air pressure value in the sensing area 112 without directly contacting the air pressure value entering through the air inlet opening 12, so as to obtain the air pressure closest to the external atmospheric pressure The air pressure value of the force.

However, as shown in FIG. 2D , the space of the sensing area 112 can also be reduced in design, so that the space of the sensing area 112 is as large as the space of the air intake area 111 .

As shown in FIG. 3, in addition to the air pressure sensor 151, the circuit board 15 further includes a central control unit 152, a height analysis unit 153 and a bit energy analysis unit 154, wherein the central control unit 152 receives the air pressure sensor After the air pressure value detected by the detector 151 is detected, the altitude analysis unit 153 can convert the corresponding altitude, and finally the potential energy analysis unit 154 analyzes the potential energy change and power.

The altitude analysis unit 153 uses the relationship between atmospheric pressure and altitude to convert. Since the altitude increases by 9 meters (m) for every 1 hectopascal (hPa) drop in atmospheric pressure, the altitude analysis formula is as follows: H ′ =H-9×(hPa ' -hPa) where H' is the height of a location, H is the initial height, hPa' is the atmospheric pressure of a location, and hPa is the initial atmospheric pressure, and after the height analysis unit 153 performs the height analysis, it is more capable of smoothing processing (data smoothing), so it is possible to average every 4 consecutive records to reduce excessive peaks and valleys in the data.

The potential energy analysis unit 154 uses the formula of potential energy change to calculate, and the potential energy analysis formula is as follows: ΔU _g =m×g×Δh where ΔUg is the potential energy change, m is the mass, g is the gravitational acceleration constant, and Δh The amount of height change, taking a 75kg rider as an example, when riding a terrain with a height difference of 4 meters, the potential energy change is 75x9.81x4=2943 joules (J).

As shown in FIG. 4A, the bicycle watch device is combined with a bicycle 2, so when a rider 3 is riding, the airflow 4 can enter through the air inlet opening 12 on the housing 1, and the air after entering The path is shown in Fig. 4B. When the strong airflow 4 enters the air inlet opening 12, it will first pass through the first air intake channel 13 and then pass through the second air intake channel 14. Since the width of the second air intake channel 14 is normal It is wider, so it can slow down the speed at which the airflow 4 enters. After finally entering the interior of the cavity 11, it will first enter the air intake area 111, and then spread from the air intake area 111 to the sensing area 112. Therefore, the air pressure value sensed by the air pressure sensor 151 will be a relatively stable air flow rather than an air flow generated by wind shear, so the sensed air pressure value will be very close to the atmospheric pressure value.

The detected air pressure value will be reanalyzed and converted into the corresponding altitude (the formula is described in [0022]), and when the initial altitude is 9 meters, the initial atmospheric pressure is 1034 hPa, so riding for a period of time After that, the atmospheric pressure of the place is 1033 hPa, and the height of the place is converted to 18 meters through the formula, and the analyzed waveform is shown in Figure 5. Since the measured air pressure value can be converted into the corresponding height , so the cyclist will be able to better understand the altitude and slope of each riding moment.

After that, it can be converted into potential energy change by using the value of its height change and the matching algorithm. The analyzed data is converted into a waveform as shown in Figure 6, and this data can be used as a follow-up calculation of the rider's output power. According to one of the reasons, the potential energy waveform in Figure 6 rises as the atmospheric pressure drop and the potential energy rise in the height rise in Figure 5, which is the energy at a height; in addition, the potential energy change waveform presents different sizes. The variable is the potential energy difference between a height and the previous height, and is the energy change generated by the height change, which is used to calculate the subsequent power, and the calculation formulas of potential energy, potential energy change and power are arranged as follows: (1) Potential energy The formula is as follows: U _g =m×g×h

Where Ug is potential energy, m is mass, g is gravitational acceleration constant, h is the height of a ground; (2) The formula for potential energy change is as follows: △U _g =m×g×△h

Among them, △Ug is the change of potential energy, m is the mass, g is the constant of gravitational acceleration, and △h is the amount of height change. Therefore, no matter when calculating the potential energy or the change of the potential energy, the weight (mass) of the rider should be considered; ( 3) The formula for power is as follows:

where P is power, ΔU _g is the change in potential energy, ΔE _k is the change in kinetic energy, t is time, and the formula for ΔE _K is as follows:

where m is the mass and Δv is the velocity change.

As shown in FIG. 7 , the casing 1 is further provided with a screen 16 , and the circuit board 15 is electrically connected to the screen 16 , so the detected or analyzed data or graphic data can be displayed on the screen 16 on.

When compared with other conventional technologies, the bicycle watch device provided by the present invention has the following advantages:

1. The present invention can design an independent cavity inside the car watch, with the design that the inner diameter of the independent cavity and an opening is not less than the outer diameter to reduce the chance of wind blowing into the car watch, and the air pressure sensing element is arranged in the independent cavity. There is an open space on one side of the cavity to reduce the fluctuation of the air pressure caused by the direct wind blowing.

2. The present invention converts the measured air pressure value into the corresponding height, so that the cyclist can know the altitude and slope of each riding time, and can use the value of its height change and the matching algorithm to convert it into bits. can change, and use this data as the basis for subsequent calculation of the rider’s output power one.

The present invention has been disclosed above through the above-mentioned embodiments. However, it is not intended to limit the present invention. Anyone familiar with this technical field with ordinary knowledge can understand the above-mentioned technical features and embodiments of the present invention, and understand the spirit and spirit of the present invention. Within the scope, slight alterations and modifications are not allowed, so the scope of the patent protection of the present invention shall be determined by the claims attached to this specification.

1: Shell

11: Cavity

111: Intake area

112: Sensing area

12: Air inlet opening

13: The first intake passage

14: Second intake passage

15: circuit board

151: Air pressure sensor

Claims (4)

A bicycle watch device comprises: a casing; an air inlet opening formed on the surface of the casing; a cavity, which is arranged in the casing, wherein the cavity is equipped with an air pressure sensor The circuit board, the air pressure sensor on the circuit board is used to measure the air pressure value of the surrounding airflow, in addition, the circuit board further includes a central control unit, a height analysis unit and a bit energy analysis unit, wherein the central The control unit is connected with the air pressure sensor, the altitude analysis unit and the potential energy analysis unit, and the position of the air pressure sensor is located on one side of the air flow direction entering from the air inlet opening, so as to make the The air pressure sensor does not directly contact the air flow entering through the air inlet opening, and after receiving the air pressure value detected by the air pressure sensor, the central control unit can use the pressure difference between different locations to penetrate the air. The corresponding height change amount is converted by the height analysis unit, so that the potential energy analysis unit can analyze the potential energy change and power; a first air intake channel is arranged in the housing, and the first air intake channel is communicated with the cavity and the air inlet opening; wherein the cavity has a sensing area and an air intake area, wherein the air pressure sensor is located in the sensing area, and the air intake area is It is communicated with the first air inlet passage; wherein the aperture of the air inlet opening is smaller than the opening width of the first air inlet passage, so that the airflow entering through the air inlet opening can gradually diffuse through the first air inlet. The air passage enters the air intake area, and the space of the sensing area is larger than the air intake area, so that the airflow entering the air intake area can be diffused into the sensing area. The bicycle watch device of claim 1, wherein the air pressure sensor on the circuit board is only It will detect the air pressure value in the sensing area without directly contacting the air pressure value entering through the air inlet opening. The bicycle watch device as claimed in claim 1, wherein a second air intake channel is further provided inside the cavity, and the second air intake channel is communicated with the cavity and the first air intake channel for guiding The airflow entered by the first intake passage. The bicycle watch device as claimed in claim 3, wherein the inner diameter width of the second air intake passage is greater than or equal to the inner diameter width of the first air intake passage.

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