A pedal with power collection function

Abstract

The invention relates to a pedal with a power collection function, comprising a pedal core shaft and a pedal body. The pedal body is provided with a core shaft cavity for inserting one end of the pedal core shaft so that the pedal body can be mounted on the pedal core shaft. The pedal core shaft is provided with a main control circuit, a strain gauge bridge circuit, an acceleration collection circuit and a system power supply circuit for providing working voltages for the main control circuit, the strain gauge bridge circuit and the acceleration collection circuit respectively. The strain gauge bridge circuit is provided with at least two groups of strain gauge groups both located in the core shaft cavity, and each group of strain gauge groups is provided with at least one strain gauge electrically connected to the main control circuit and arranged around the circumference of the pedal core shaft; the main control circuit calculates and outputs the real-time power data of the user based on the collected data of the strain gauge bridge circuit and the collected data of the acceleration collection circuit; the strain gauges are distributed in a surrounding array to collect forces in the vertical and horizontal directions, which does not affect the structural strength and collects data more accurately within a reasonable space.

Description

[Technical field]

[0002] The invention relates to the technical field of pedals, in particular to a pedal with a power collection function. [Background technology]

[0004] The pedals with power collection function in current technology generally adopt a hollow pedal shaft, and the data collection device is placed in the hollow hole. Although this structure is simple and there is no need to redesign the connection mechanism between the pedal shaft and the pedal body, the structural strength of the hollow pedal shaft is greatly reduced, and the shaft is prone to breakage, and the product life is short. Placing the data collection device on the surface of the pedal shaft undoubtedly increases the design difficulty. If the data collection device is set in a limited space, it is the problem to be solved by the invention. [Summary of the invention]

[0006] In order to solve the above problems, the present invention provides a pedal with power collection function, which realizes data collection in a limited space by distributing multiple strain gauges in an array around the pedal core shaft, and the design is ingenious.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A pedal with a power collection function comprises a pedal spindle 1 and a pedal body 2, wherein the pedal body 2 is provided with a spindle cavity 20 for inserting one end of the pedal spindle 1 so that the pedal body 2 can be mounted on the pedal spindle 1, the pedal spindle 1 is provided with a main control circuit 101, a strain gauge bridge circuit 102, an acceleration collection circuit 103 and a system power supply circuit 104 for providing working voltages to the main control circuit 101, the strain gauge bridge circuit 102 and the acceleration collection circuit 103 respectively, the strain gauge bridge circuit 102 is provided with at least two groups of strain gauge groups both located in the spindle cavity 20, each group of the strain gauge groups is provided with at least four strain gauges 3 respectively electrically connected to the main control circuit 101 and arranged around the circumference of the pedal spindle 1; the main control circuit 101 calculates and outputs real-time power data of the user based on the collected data of the strain gauge bridge circuit 102 and the collected data of the acceleration collection circuit 103.

[0009] As a preferred embodiment, it is further defined as: the strain gauge groups are set to 2 groups in total, each group of the strain gauge groups is provided with 4 strain gauges 3 in total, each group of the strain gauge groups has two strain gauges 3 respectively located on the upper and lower sides of the pedal core shaft 1 and parallel to the horizontal plane, and the other two strain gauges 3 are respectively located on the front and rear sides of the pedal core shaft 1 and perpendicular to the horizontal plane.

[0010] As a preferred embodiment, it is further defined as: an operational amplifier circuit 105 is also provided on the pedal spindle 1, the signal input end of the operational amplifier circuit 105 is connected to the signal output end of the strain gauge bridge circuit 102, the signal output end of the operational amplifier circuit 105 is connected to the signal input end of the main control circuit 101, and the operational amplifier circuit 105 amplifies the collected data signal of the strain gauge bridge circuit 102 and transmits it to the main control circuit 101.

[0011] As a preferred embodiment, it is further defined as: a battery 4 electrically connected to a system power supply circuit 104 is also provided on the pedal shaft 1; a circuit board 5 is also provided on the pedal shaft 1, and the main control circuit 101, the strain gauge bridge circuit 102, the acceleration acquisition circuit 103, the operational amplifier circuit 105 and the system power supply circuit 104 are all provided on the circuit board 5; the battery 4 and the circuit board 5 are distributed around the circumference of the pedal shaft 1.

[0012] As a preferred embodiment, it is further defined as: a strain gauge bridge power supply circuit 106 is also provided on the circuit board 5, the power input end of the strain gauge bridge power supply circuit 106 is electrically connected to the system power supply circuit 104, and the power output end of the strain gauge bridge power supply circuit 106 is electrically connected to the strain gauge bridge circuit 102.

[0013] As a preferred embodiment, it is further defined as follows: a plurality of first planar portions 11 for fixing the strain gauges 3 are arranged around one end of the pedal spindle 1 inserted into the spindle cavity 20 .

[0014] As a preferred embodiment, it is further defined as: one end of the pedal core shaft inserted into the core shaft cavity 20 is equipped with a first bearing 6, the middle part of the pedal core shaft is equipped with a second bearing 7, the two groups of strain gauge groups are respectively located on both sides of the second bearing 7, and one group of strain gauge groups is located between the first bearing 6 and the second bearing 7.

[0015] As a preferred embodiment, it is further defined as: a plurality of second plane portions 12 are arranged around one end of the pedal spindle 1 exposed outside the spindle cavity 20 , and the battery 4 and the fixed circuit board 5 are respectively fixed on different second plane portions 12 .

[0016] As a preferred embodiment, it is further defined as: the pedal core shaft 1 is also provided with a sealing cover 8 covering the outside of the battery 4 and the fixed circuit board 5, and the sealing cover 8 is provided with a sealing ring 9. After assembly, the sealing ring 9 seals the cavity opening of the core shaft cavity 20.

[0017] As a preferred implementation, it is further defined as follows: the main control circuit 101 calculates the user's real-time power data through the following calculation formula:

[0018] D1=L*A1*K1 / (A1*K1-A2*K2),

[0019] F1=A1*K1 / D1,

[0020] P1=F1*Lcrank*rpm*K3,

[0021] D2=L*A2*K2 / (A1*K1-A2*K2),

[0022] F2=A2*K2 / D2,

[0023] P2=F2*Lcrank*rpm*K3,

[0024] Ptotal = P1 + P2,

[0025] Wherein A1 is the sum of the voltage values ​​collected by all the strain gauges 3 in the first strain gauge group, A2 is the sum of the voltage values ​​collected by all the strain gauges 3 in the second strain gauge group, K1 is the error adjustment coefficient obtained by comparing the test power of the first strain gauge group with the standard power at the factory, K2 is the error adjustment coefficient obtained by comparing the test power of the second strain gauge group with the standard power at the factory, L is the distance between the strain gauges 3, rpm is the speed data collected by the acceleration acquisition circuit 103, K3 is the error adjustment coefficient obtained by comparing the total test power at the factory with the standard total power, P1 is the power collected by the first strain gauge group, P2 is the power collected by the second strain gauge group, Lcrank is the crank length of the bicycle, and Ptotal is the real-time power of the user.

[0026] The beneficial effect of the invention is that the strain gauges created by the invention adopt a surrounding array distribution to collect vertical and horizontal forces, which does not affect the structural strength and can collect data more accurately within a reasonable space.

[0027] In addition, the various circuits are integrated on a circuit board, and the circuit board and the battery are also distributed in a surrounding manner on the pedal core shaft. The space is arranged reasonably and effectively, the product structure is compact, and the design is ingenious.

Brief Description of the Drawings

[0029] Figure 1 It is a structural schematic diagram of the invention;

[0030] Figure 2 It is one of the structural decomposition diagrams created by the present invention;

[0031] Figure 3 This is the second schematic diagram of the structural decomposition of the present invention;

[0032] Figure 4 It is a partial structural decomposition schematic diagram of the invention;

[0033] Figure 5 It is a circuit principle block diagram created by the present invention;

[0034] Figure 6 It is the circuit diagram of the system power supply circuit;

[0035] Figure 7 It is the circuit diagram of the power supply circuit of the strain gauge bridge system;

[0036] Figure 8 It is the circuit diagram of the strain gauge bridge circuit;

[0037] Fig. 9 It is the circuit diagram of the op amp circuit;

[0038] Fig.10 It is the circuit diagram of the main control circuit;

[0039] Fig.11 It is the circuit diagram of the acceleration acquisition circuit. [Specific implementation method]

[0041] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0042] As attached Figure 1 To Attachment Fig.11 As shown, a pedal with power harvesting function includes a pedal spindle 1 and a pedal body 2. The pedal body 2 is provided with a spindle cavity 20 for inserting one end of the pedal spindle 1 so that the pedal body 2 can be mounted on the pedal spindle 1. Generally speaking, the size of the spindle cavity 20 is roughly the same in the industry, and the space is small. The pedal spindle 1 is provided with a main control circuit 101, a strain gauge bridge circuit 102, an acceleration acquisition circuit 103, and a system power supply circuit 104 for providing working voltage to the main control circuit 101, the strain gauge bridge circuit 102, and the acceleration acquisition circuit 103. The strain gauge bridge circuit 102 is provided with at least two groups of strain gauges both located in the spindle cavity 20, and each group of the strain gauge groups is provided with at least four strain gauges 3 electrically connected to the main control circuit 101 and arranged around the circumference of the pedal spindle 1; the main control circuit 101 calculates and outputs the user's real-time power data based on the collected data of the strain gauge bridge circuit 102 and the collected data of the acceleration acquisition circuit 103. The strain gauges are distributed in a surrounding array to collect vertical and horizontal forces, which does not affect the structural strength and can collect data more accurately within a reasonable space.

[0043] In this embodiment, the number of strain gauge groups and the number of strain gauges in each strain gauge group can be increased, but the strain gauge groups are set to 2 groups in total, and each strain gauge group is provided with 4 strain gauges 3 in total. This is the technical solution with the lowest cost and the lowest technical complexity, and the measurement data has a good effect and the test is accurate. In this embodiment, an implementation method is listed. Furthermore, each strain gauge group has two strain gauges 3 respectively located on the upper and lower sides of the pedal shaft 1 and parallel to the horizontal plane, which are used to measure the horizontal force. The other two strain gauges 3 are respectively located on the front and rear sides of the pedal shaft 1 and perpendicular to the horizontal plane, which are used to measure the vertical force. Furthermore, when in use, the two groups of strain gauges are roughly distributed below the two sides of the sole of the human body, which can measure the data more accurately. One group of strain gauges is attached. Figure 8 RB1, RB2, RB3 and RB4 in the figure, and the other strain gauges are attached Figure 8 RB5, RB6, RB7 and RB8.

[0044] An operational amplifier circuit 105 is also provided on the pedal spindle 1. The signal input end of the operational amplifier circuit 105 is connected to the signal output end of the strain gauge bridge circuit 102, and the signal output end of the operational amplifier circuit 105 is connected to the signal input end of the main control circuit 101. The operational amplifier circuit 105 amplifies the collected data signal of the strain gauge bridge circuit 102 and transmits it to the main control circuit 101. Since the signal of the strain gauge bridge circuit 102 is generally at the level of several hundred microvolts, it needs to be amplified by the operational amplifier circuit 105 by several hundred times or even one thousand times. After the signal is amplified, it generally reaches the millivolt level, which is convenient for the main control circuit 101 to receive the signal and perform data calculation and processing.

[0045] In this embodiment, as shown in the attached Figure 3 and attached Figure 4 As shown, the pedal shaft 1 is also provided with a battery 4 electrically connected to the system power supply circuit 104; the pedal shaft 1 is also provided with a circuit board 5, and the main control circuit 101, strain gauge bridge circuit 102, acceleration acquisition circuit 103, operational amplifier circuit 105 and system power supply circuit 104 are all arranged on the circuit board 5; the battery 4 and circuit board 5 are distributed around the circumference of the pedal shaft 1. The various circuits are assembled on a circuit board, and the circuit board and battery are also distributed around the pedal shaft, with reasonable and effective space layout, compact product structure and ingenious design. As shown in the attached Figure 2 and attached Figure 3As shown, due to the limited space of the mandrel cavity 20, the battery 4 and the circuit board 5 are located around the cavity opening of the mandrel cavity 20. In order to protect the electronic devices, the pedal mandrel 1 is also equipped with a sealing cover 8 covering the outside of the battery 4 and the fixed circuit board 5. The sealing cover 8 can effectively protect the battery 4 and the fixed circuit board 5. The sealing cover 8 and the mandrel cavity 20 also need to be sealed to prevent rainwater and dust from entering the mandrel cavity 20. Therefore, the sealing cover 8 is equipped with a sealing ring 9 on the side facing the mandrel cavity 20. After assembly, the sealing ring 9 blocks the cavity opening of the mandrel cavity 20, effectively achieving the effect of sealing and dustproof.

[0046] In this embodiment, a strain gauge bridge power supply circuit 106 is further provided on the circuit board 5, and a power input end of the strain gauge bridge power supply circuit 106 is electrically connected to the system power supply circuit 104, and a power output end of the strain gauge bridge power supply circuit 106 is electrically connected to the strain gauge bridge circuit 102. The voltage output by the system power supply circuit 104 is 3V, so the voltage needs to be converted by the strain gauge bridge power supply circuit 106 to meet the working voltage requirement of the strain gauge 3.

[0047] In this embodiment, in order to better assemble the strain gauge 3, a plurality of first planar portions 11 for fixing the strain gauge 3 are arranged around one end of the pedal core shaft 1 inserted into the core shaft cavity 20. Specifically, a total of 8 strain gauges 3 are arranged, and 8 corresponding first planar portions 11 are also arranged, of which 4 are parallel to the horizontal plane and the other 4 are perpendicular to the horizontal plane. In addition, in order to better install the battery 4 and the fixed circuit board 5, a plurality of second planar portions 12 are arranged around one end of the pedal core shaft 1 exposed outside the core shaft cavity 20, and the battery 4 and the fixed circuit board 5 are respectively fixed on different second planar portions 12.

[0048] In this embodiment, one end of the pedal spindle inserted into the spindle cavity 20 is equipped with a first bearing 6, the middle of the pedal spindle is equipped with a second bearing 7, two groups of strain gauges are respectively located on both sides of the second bearing 7, and one group of strain gauges is located between the first bearing 6 and the second bearing 7. The structural layout is ingenious and reasonable.

[0049] In this embodiment, the main control circuit 101 calculates the real-time power data of the user through the following calculation formula:

[0050] D1=L*A1*K1 / (A1*K1-A2*K2),

[0051] F1=A1*K1 / D1,

[0052] P1=F1*Lcrank*rpm*K3,

[0053] D2=L*A2*K2 / (A1*K1-A2*K2),

[0054] F2=A2*K2 / D2,

[0055] P2=F2*Lcrank*rpm*K3,

[0056] Ptotal = P1 + P2,

[0057] Wherein A1 is the sum of the voltage values ​​collected by all the strain gauges 3 in the first strain gauge group, A2 is the sum of the voltage values ​​collected by all the strain gauges 3 in the second strain gauge group, K1 is the error adjustment coefficient obtained by comparing the test power of the first strain gauge group with the standard power at the factory, K2 is the error adjustment coefficient obtained by comparing the test power of the second strain gauge group with the standard power at the factory, L is the distance between the strain gauges 3, rpm is the speed data collected by the acceleration acquisition circuit 103, K3 is the error adjustment coefficient obtained by comparing the total test power at the factory with the standard total power, P1 is the power collected by the first strain gauge group, P2 is the power collected by the second strain gauge group, Lcrank is the crank length of the bicycle, and Ptotal is the real-time power of the user.

[0058] The circuit board of the pedal may also be provided with a wireless transmission module for transmitting the user's real-time power data to a terminal (such as mobile phone software, computer or test equipment, etc.) via a 5G signal or a Bluetooth signal. A wireless charging module, a wired charging module or a magnetic charging module may also be added to the circuit board of the pedal to charge the battery 4.

Claims

1. A pedal with a power collection function, comprising a pedal spindle (1) and a pedal body (2), wherein the pedal body (2) is provided with a spindle cavity (20) for inserting one end of the pedal spindle (1) so that the pedal body (2) can be mounted on the pedal spindle (1), characterized in that The pedal spindle (1) is provided with a main control circuit (101), a strain gauge bridge circuit (102), an acceleration acquisition circuit (103), and a system power supply circuit (104) for providing working voltages to the main control circuit (101), the strain gauge bridge circuit (102), and the acceleration acquisition circuit (103), respectively; the strain gauge bridge circuit (102) is provided with at least two groups of strain gauge groups both located in the spindle cavity (20); each group of the strain gauge groups is provided with at least four strain gauges (3) respectively electrically connected to the main control circuit (101) and arranged around the circumference of the pedal spindle (1); the main control circuit (101) calculates and outputs real-time power data of the user according to the collected data of the strain gauge bridge circuit (102) and the collected data of the acceleration acquisition circuit (103); The strain gauge groups are arranged in two groups, each of which is provided with four strain gauges (3). Each strain gauge group has two strain gauges (3) located on the upper and lower sides of the pedal core shaft (1) and parallel to the horizontal plane, and the other two strain gauges (3) are located on the front and rear sides of the pedal core shaft (1) and perpendicular to the horizontal plane. An operational amplifier circuit (105) is also provided on the pedal spindle (1); a signal input end of the operational amplifier circuit (105) is connected to a signal output end of the strain gauge bridge circuit (102); a signal output end of the operational amplifier circuit (105) is connected to a signal input end of the main control circuit (101); the operational amplifier circuit (105) amplifies the collected data signal of the strain gauge bridge circuit (102) and transmits the amplified data signal to the main control circuit (101); The pedal spindle (1) is also provided with a storage battery (4) electrically connected to the system power supply circuit (104); the pedal spindle (1) is also provided with a circuit board (5), and the main control circuit (101), the strain gauge bridge circuit (102), the acceleration acquisition circuit (103), the operational amplifier circuit (105) and the system power supply circuit (104) are all provided on the circuit board (5); the storage battery (4) and the circuit board (5) are distributed around the circumference of the pedal spindle (1); A strain gauge bridge power supply circuit (106) is also provided on the circuit board (5), a power supply input end of the strain gauge bridge power supply circuit (106) is electrically connected to the system power supply circuit (104), and a power supply output end of the strain gauge bridge power supply circuit (106) is electrically connected to the strain gauge bridge circuit (102); The main control circuit (101) calculates the real-time power data of the user through the following calculation formula: D1=L*A1*K1 / (A1*K1-A2*K2), F1=A1*K1 / D1, P1=F1*Lcrank*rpm*K3, D2=L*A2*K2 / (A1*K1-A2*K2), F2=A2*K2 / D2, P2=F2*Lcrank*rpm*K3, Ptotal = P1 + P2, Wherein A1 is the sum of the voltage values ​​collected by all the strain gauges (3) in the first strain gauge group, A2 is the sum of the voltage values ​​collected by all the strain gauges (3) in the second strain gauge group, K1 is the error adjustment coefficient obtained by comparing the test power of the first strain gauge group with the standard power at the time of leaving the factory, K2 is the error adjustment coefficient obtained by comparing the test power of the second strain gauge group with the standard power at the time of leaving the factory, L is the distance between the strain gauges (3), rpm is the speed data collected by the acceleration collection circuit (103), K3 is the error adjustment coefficient obtained by comparing the total test power at the time of leaving the factory with the standard total power, P1 is the power collected by the first strain gauge group, P2 is the power collected by the second strain gauge group, Lcrank is the crank length of the bicycle, and Ptotal is the real-time power of the user.

2. The pedal with power collection function according to claim 1, characterized in that One end of the pedal spindle inserted into the spindle cavity (20) is equipped with a first bearing (6), and the middle part of the pedal spindle is equipped with a second bearing (7). The two groups of strain gauge groups are respectively located on both sides of the second bearing (7), and one group of strain gauge groups is located between the first bearing (6) and the second bearing (7).

3. The pedal with power collection function according to claim 1, characterized in that A plurality of second plane portions (12) are arranged around one end of the pedal spindle (1) exposed outside the spindle cavity (20), and the storage battery (4) and the fixed circuit board (5) are respectively fixed on different second plane portions (12).

4. The pedal with power collection function according to claim 1, characterized in that The pedal spindle (1) is also provided with a sealing cover (8) covering the outside of the battery (4) and the fixed circuit board (5), and the sealing cover (8) is provided with a sealing ring (9). After assembly, the sealing ring (9) seals the cavity opening of the spindle cavity (20).

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