CN109682609B - Bicycle treading efficiency detection method and system - Google Patents
Bicycle treading efficiency detection method and system Download PDFInfo
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- CN109682609B CN109682609B CN201811543270.1A CN201811543270A CN109682609B CN 109682609 B CN109682609 B CN 109682609B CN 201811543270 A CN201811543270 A CN 201811543270A CN 109682609 B CN109682609 B CN 109682609B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a method for detecting the pedaling efficiency of a bicycle, which comprises the following steps: firstly, calculating the distances L1 and L2 between each pedal and the upper limit position and the lower limit position of each pedal in a specific position in the vertical direction; then detecting the movement time and the acceleration change of each pedal, and calculating and obtaining the displacements s1 and s2 of each pedal in the vertical direction between the position of the pedal at the current moment and the upper limit position or the lower limit position of the pedal according to the movement time and the acceleration change; finally, it is determined whether each pedal is located at a specific position and the corresponding pressures P1 and P2 are detected, and the bicycle pedaling efficiency is calculated accordingly. The invention also provides a system for detecting the treading efficiency of the bicycle. According to the method and the system provided by the invention, the position of the pedal is judged by detecting the acceleration of the pedal, so that the fluctuation of the pedaling efficiency caused by the change of the pedaling force and the self-gravity in different directions and ranges in the pedaling process is obtained, the rider can adjust the pedaling rhythm in a targeted manner, and the training effect is relatively good.
Description
Technical Field
The invention relates to an efficiency detection method and system, in particular to a bicycle treading efficiency detection method and system.
Background
The riding is an aerobic exercise mode which is popular among people, and in order to reduce physical consumption of riding so as to enable the rider to ride faster and farther, the rider generally needs to adjust the pedaling rhythm according to the pedaling efficiency of the rider.
The existing tools for obtaining the pedaling efficiency of the bicycle are usually a power meter and a stopwatch, the existing power meter and stopwatch can only obtain the pedaling efficiency after a period of riding, however, when a rider pedals, the main pedaling force should appear in the range of 30 degrees to 120 degrees of vertical pedaling, namely, one-point to four-point direction of a chain wheel, the maximum pedaling force should occur at 90 degrees, namely, three-point direction of the chain wheel, and in the process of applying the pedaling force by one foot, the other foot is in the stage from the lower limit position to the upper limit position, the gravity should tend to disappear, and since the existing tools are difficult to detect and obtain the fluctuation of the pedaling efficiency caused by the change of the pedaling force and the gravity in different directions and ranges in the pedaling process, the rider is also difficult to adjust the pedaling rhythm in a targeted manner, and the training effect is relatively poor.
In view of the above, the applicant has made an intensive study on a method and a system for detecting pedaling efficiency of a bicycle, and has generated the present application.
Disclosure of Invention
The invention aims to provide a bicycle treading efficiency detection method and system with relatively good training effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting the treading efficiency of a bicycle is provided with a chain wheel, two cranks and pedals, wherein one ends of the cranks are fixedly connected to two sides of the chain wheel respectively, the pedals are rotatably connected to the other ends of the two cranks respectively, one end of each crank, which is connected with the chain wheel, is located at the axis position of the chain wheel, and the two cranks are the same in length and located on the same straight line, and the method comprises the following steps:
s1, calculating a vertical distance L1 between the position of the pedal corresponding to the crank and the upper limit position of the pedal and a vertical distance L2 between the position of the other pedal and the lower limit position of the pedal when the crank forms a preset angle theta with the vertical plane according to the length r of the crank;
s2, detecting the movement time and the change of the acceleration in the vertical direction of the pedal moving from the upper limit position to the lower limit position from the last time to the current time, and calculating the displacement S1 in the vertical direction between the position of the pedal at the current time and the upper limit position, detecting the movement time and the change of the acceleration in the vertical direction from the last time to the current time, and calculating the displacement S2 in the vertical direction between the position of the pedal at the current time and the lower limit position;
s3, comparing the value of L1+ L2 with the value of S1+ S2, if the two values are the same, detecting the pressure P1 received by the pedal moving from the upper limit position to the lower limit position and the pressure P2 received by the other pedal at the current moment, and calculating the pedaling efficiency according to the pressure P1 and the pressure P2.
As a refinement of the present invention, the calculation formula for the distance L1 and the distance L2 is L ═ r (1-cos θ), where L ═ L1 or L ═ L2.
As a refinement of the invention, the predetermined angle θ is 30 °, 90 ° or 120 °.
A bicycle trampling efficiency detection system comprises a chain wheel, two cranks and a pedal, wherein one ends of the two cranks are fixedly connected to two sides of the chain wheel respectively, the pedals are rotatably connected to the other ends of the two cranks respectively, one ends of the cranks, which are connected with the chain wheel, are located at the axis position of the chain wheel, the two cranks are the same in length and are located on the same straight line, and the detection system comprises pressure sensors, acceleration sensors and a microprocessor, wherein the pressure sensors are used for detecting the pressure on the pedals respectively in real time, the acceleration sensors are used for detecting the acceleration of the pedals in the vertical direction in real time, and the microprocessor is in communication connection with the pressure sensors and the acceleration sensors respectively;
inputting the length r of the crank and more than one preset angle theta into the microprocessor in advance, and calculating each interval L1 in the vertical direction between the position of the pedal corresponding to the crank and the upper limit position of the pedal and each interval L2 in the vertical direction between the position of the other pedal and the lower limit position of the pedal when one crank forms each preset angle theta with the vertical plane according to the length r and each preset angle theta by the microprocessor; or inputting more than one preset angle theta and each interval L1 between the position of the pedal corresponding to one crank and the upper limit position of the pedal and each interval L2 between the position of the other pedal and the lower limit position of the pedal in the vertical direction when the crank forms each preset angle theta into the microprocessor in advance;
when stepping on, the microprocessor judges the movement direction of the corresponding pedal according to the acceleration acquired by each acceleration sensor, and calculates a displacement s1 in the vertical direction between the position of the pedal moving from the upper limit position to the lower limit position at the current moment relative to the upper limit position and a displacement s2 in the vertical direction between the position of the other pedal at the current moment relative to the lower limit position according to the numerical value of the acceleration acquired by each acceleration sensor; then the microprocessor compares the value of L1+ L2 with the value of S1+ S2, when the two values are the same, the pressure P1 received by the pedal moving from the upper limit position to the lower limit position at the current moment and the pressure P2 received by the other pedal are obtained through the corresponding pressure sensors, and the bicycle pedaling efficiency when one crank forms the preset angle theta corresponding to the vertical plane is obtained through calculation according to the pressure P1 and the pressure P2.
As an improvement of the invention, the microprocessor is connected with a wireless communication module or a connection port for communication connection with an external terminal.
As an improvement of the invention, the shoe locking device further comprises a shoe locking device, wherein the shoe locking device comprises shoe bodies respectively installed on the pedals, and each pressure sensor and each acceleration sensor are respectively installed on the corresponding shoe body.
As an improvement of the present invention, each of the shoe bodies includes a sole and an auxiliary strap, a placement groove is formed in the sole, an element box is placed in the placement groove, the auxiliary strap is located between the element box and a groove bottom of the placement groove, two ends of the auxiliary strap respectively penetrate out of the placement groove, the corresponding acceleration sensor is installed in the corresponding element box on the shoe body, and the corresponding pressure sensor is installed on an upper surface of the sole of the corresponding shoe body.
As an improvement of the invention, each sole is connected with a corresponding pedal through a locking piece, and the locking pieces on the same sole and the pressure sensor are mutually corresponding in position.
As an improvement of the present invention, each of the pressure sensors is a piezoelectric film sensor, and each of the acceleration sensors is a MEMS acceleration sensor.
As an improvement of the present invention, the microprocessor performs a primary integration according to the acceleration obtained by each acceleration sensor to obtain the direction and the change of the speed of the corresponding pedal, and accordingly determines whether the corresponding pedal passes through the lower limit position of the pedal, and records the number of times and the time that the pedal passes through the lower limit position of the pedal.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the method and the system provided by the invention judge the position of the pedal by detecting the acceleration of the pedal, so as to obtain the pedaling force data of different positions in the pedaling process, and further obtain the fluctuation of the pedaling efficiency caused by the variation of the pedaling force and the self-gravity in different directions and ranges in the pedaling process, so that the rider can adjust the pedaling rhythm in a targeted manner, and the training effect is relatively good.
2. Through setting up each sensor and lock shoes, be different from traditional power meter, need not to adjust or change the chain wheel of bicycle itself, crank, lock step on etc. and general nature is strong.
Drawings
FIG. 1 is a schematic diagram illustrating a method for detecting pedaling efficiency of a bicycle according to the present invention;
FIG. 2 is a schematic structural view of a bicycle pedaling efficiency detecting system according to the present invention;
FIG. 3 is a schematic structural view of the locking shoe of the present invention, with parts omitted;
FIG. 4 is an exploded view of the locking shoe of the present invention, with parts omitted;
fig. 5 is a schematic view of the internal structure of the element case of the present invention.
The designations in the figures correspond to the following:
10-a chain wheel; 11-a crank;
12-pedaling; 20-a pressure sensor;
30-an acceleration sensor; 40-a microprocessor;
50-a wireless communication module; 60-shoe body;
61-shoe upper; 62-a sole;
63-shoe pad; 64-an auxiliary band;
65-placing grooves; 66-component cartridge;
67-locking tab; 70-power supply.
Detailed Description
The invention will be further described with reference to specific examples:
the first embodiment.
The present embodiment provides a method for detecting pedaling efficiency of a bicycle, as shown in fig. 1, the bicycle comprises a chain wheel 10, two cranks 11 with one end fixedly connected to two sides of the chain wheel 10, and two pedals 12 rotatably connected to the other ends of the two cranks 11, i.e. there are two pedals 12, namely a left pedal and a right pedal. The end of each crank 11 connected with the chain wheel 10 is located at the axial center position of the chain wheel 10, and the two cranks 11 have the same length and are located on the same straight line, so that when the cranks 11 are vertically arranged, the position of the pedal 12 located at the upper end of the corresponding crank 11 is the upper limit position of the pedal 12, namely the position of the a point in fig. 1, the position of the pedal 12 located at the lower end of the corresponding crank 11 is the lower limit position of the pedal 12, namely the position of the b point in fig. 1, and the circle formed by the pedal 12 axially rotating one circle around the chain wheel 10 is the pedal circle. Of course, the specific connection position relationship among the crankset 10, the crank 11 and the pedals 12 is the same as that of the conventional bicycle, and is not the focus of the embodiment, and will not be described in detail.
The method provided by the embodiment comprises the following steps:
s1, calculating the vertical distance L1 between the position of the pedal 12 corresponding to the crank 11 and the upper limit position of the pedal 12 and the vertical distance L2 between the position of the other pedal 12 and the lower limit position of the pedal 12 when one crank 11 forms a preset angle theta with the vertical plane according to the length r of the crank 11; the length r of the crank 11 is a fixed value, and can be obtained by pre-measurement, so that when the value of the predetermined angle θ is determined, the distance L1 and the distance L2 are fixed values. Note that the predetermined angle θ is an angle obtained by measuring in the clockwise or counterclockwise direction of the crankset 10 with reference to a line connecting the axis of the crankset 10 and the upper limit position, that is, when the measurement directions are opposite, the angle is a negative value.
The value of the predetermined angle θ can be selected from 0 to 180 ° according to actual needs, for example, it can be 30 °, 90 ° or 120 °, and in this embodiment, 30 ° is taken as an example for explanation, and then one of the pedals 12 is located at the point c in fig. 1. It should be noted that, when the predetermined angle θ is 0 ° or 180 °, the values of the distance L1 and the distance L2 are both zero, and one of the pedals 12 is at the upper limit position, and the other pedal 12 is at the lower limit position.
The calculation formulas of the spacing L1 and the spacing L2 are both L ═ r (1-cos θ), where L ═ L1 or L ═ L2, and are derived according to the pythagorean theorem of direct triangle, and the specific derivation methods are conventional mathematical derivation methods, and are not important in the embodiment, and are not described in detail here.
S2, during stepping, the movement time and the change in acceleration in the vertical direction from the last time the step 12, which is moved from the upper limit position toward the lower limit position, passes the upper limit position to the present time are detected, and the displacement S1 in the vertical direction between the position of the step 12 at the present time and the upper limit position is calculated based on the movement time and the change in acceleration in the vertical direction from the last time the step 12 passes the lower limit position to the present time, and the displacement S2 in the vertical direction between the position of the step 12 at the present time and the lower limit position is calculated based on the movement time and the change in acceleration in the vertical direction from the last time the step 12, which is moved from the lower limit position toward the upper limit position, is detected.
The acceleration can be detected byThe acceleration may be obtained in a direct manner or in an indirect manner, as is conventional, for example, by using the acceleration sensor 30 or by using a vision system. In this embodiment, the acceleration is detected by using a three-axis acceleration sensor or a six-axis acceleration sensor that is directly commercially available, and during the stepping, the velocity is obtained by performing primary integration on the obtained acceleration, the velocity in the vertical direction is zero when the pedal 12 is at the upper limit position and the lower limit position, the displacement is obtained by performing secondary integration on the obtained acceleration, and the vertical displacement between the current position of the pedal 12 and the upper limit position or the lower limit position thereof can be calculated. In particular, according to mathematical formulae
And
can derive the formula
According to the formula, a velocity formula and a displacement formula can be obtained through derivation, wherein a is acceleration, t is time, s is displacement, and v is velocity.
It should be noted that each detection of the acceleration and the corresponding vertical position calculation is based on the upper limit position (i.e., point a in fig. 1) or the lower limit position (i.e., point b in fig. 1) of the corresponding pedal 12, specifically, when the pedal 12 moves from the upper limit position to the lower limit position, each detection of the acceleration and the corresponding vertical position calculation is based on the upper limit position of the pedal 12, and when the pedal 12 moves from the lower limit position to the upper limit position, each detection of the acceleration and the corresponding vertical position calculation is based on the lower limit position of the pedal 12, that is, each rotation of the pedal 12 requires twice changes in the reference.
S3, comparing the value of L1+ L2 with the value of S1+ S2, detecting the pressure P1 to which the pedal 12 moving from the upper limit position to the lower limit position and the pressure P2 to which the other pedal 12 (i.e. the pedal 12 moving from the lower limit position to the upper limit position) receives at the current time when the values are the same, and calculating the bicycle pedaling efficiency according to the pressure P1 and the pressure P2, wherein the specific calculation formula is (P1+ P2)/P1, where P is the bicycle pedaling efficiency, and the bicycle pedaling efficiency is the bicycle pedaling efficiency when the crank 11 is at the designated position.
Example two.
In the present embodiment, a bicycle pedaling efficiency detecting system is provided, which adopts the bicycle pedaling efficiency detecting method of the embodiment, and referring to fig. 1, a bicycle matched with the system has a chain wheel 10, two cranks 11 with one end fixedly connected to two sides of the chain wheel 10 respectively, and pedals 12 rotatably connected to the other ends of the two cranks 11 respectively, that is, there are two pedals 12, namely a left pedal and a right pedal respectively. The end of each crank 11 connected with the chain wheel 10 is located at the axial center position of the chain wheel 10, and the two cranks 11 have the same length and are located on the same straight line, so that when the cranks 11 are vertically arranged, the position of the pedal 12 located at the upper end of the corresponding crank 11 is the upper limit position of the pedal 12, namely the position of the a point in fig. 1, the position of the pedal 12 located at the lower end of the corresponding crank 11 is the lower limit position of the pedal 12, namely the position of the b point in fig. 1, and the circle formed by the pedal 12 axially rotating one circle around the chain wheel 10 is the pedal circle. Of course, the specific connection position relationship among the crankset 10, the crank 11 and the pedals 12 is the same as that of the conventional bicycle, and is not the focus of the embodiment, and will not be described in detail.
As shown in fig. 2 to 5, the present embodiment provides a sensing system including pressure sensors 20 for sensing pressure applied to each of the pedals 12 in real time, acceleration sensors 30 for sensing acceleration of each of the pedals 12 in the vertical direction in real time, and a microprocessor 40 in communication with each of the pressure sensors 20 and the acceleration sensors 30, i.e., two pressure sensors 20 and acceleration sensors 30 each. The microprocessor 40 may have only one or two microprocessors 40, and when there are two microprocessors 40, the pressure sensor 20 and the acceleration sensor 30 for detecting the same pedal 12 are communicatively connected to the same microprocessor 40, and the specific communication connection may be a conventional connection, such as a wireless connection or a connection via a wire. In the present embodiment, two microprocessors 40 are taken as an example for explanation. Furthermore, each microprocessor 40 is connected with a power supply 70 and a wireless communication module 50 or a connection port for communication connection with an external terminal, wherein the external terminal is a conventional terminal, such as a stopwatch, a special handset, a mobile phone or a computer with a specific APP installed, and the like, as long as data interaction with the wireless communication module 50 or the connection port is possible, and the external terminal is not part of the detection system in the present embodiment. It should be noted that the pressure sensors 20, the acceleration sensor 30, the microprocessor 40, the power supply 70, and the wireless communication module 50 or the connection port are all commercially available electronic components, and preferably, in the present embodiment, each pressure sensor 20 is a piezoelectric film sensor, each acceleration sensor 30 is a MEMS acceleration sensor, the model of which is ADXL355, the model of the microprocessor 40 is ATF16V8B-15JU, the model of the wireless communication module 50 is SI4432, and the power supply 70 is a battery.
Preferably, the detecting system of the embodiment further includes a pair of locking shoes, each locking shoe includes two shoe bodies 60 respectively installed on each pedal 12, that is, the two shoe bodies 60 are respectively a left shoe body and a right shoe body, each pressure sensor 20, each acceleration sensor 30, each microprocessor 40, each power supply 70 and each wireless communication module 50 are respectively installed on the corresponding shoe body 60, that is, each shoe body 60 is installed with a group of pressure sensors 20, acceleration sensors 30, microprocessors 40, wireless communication modules 50 and power supplies 70 connected to each other. Specifically, each shoe body 60 includes a vamp 61, a sole 62, a shoe pad 63 and an auxiliary strip 64, wherein the auxiliary strip 64 is a strip mesh, and the connection position relationship among the vamp 61, the sole 62 and the shoe pad 63 is the same as that of a conventional shoe, which is not the focus of the embodiment and is not described in detail herein; the sole 62 is provided with a placing groove 65, an element box 66 is placed in the placing groove 65, the auxiliary belt 64 is positioned between the element box 66 and the groove bottom of the placing groove 65, two ends of the auxiliary belt 64 penetrate out of the placing groove 65 respectively, one end of the auxiliary belt 64 is adhered to the upper surface of the sole 62, the other end of the auxiliary belt 64 is placed on or detachably connected to the upper surface of the sole 62, and therefore the element box 66 can be taken out of the placing groove 65 quickly by pulling the auxiliary belt 64. The corresponding acceleration sensor 30, microprocessor 40, wireless communication module 50 and power source 70 are mounted in the element box 66 on the corresponding shoe body 60, and the corresponding pressure sensor 20 is disposed on the upper surface of the sole 62 on the corresponding shoe body 60. Each of the soles 62 is connected to the corresponding foothold 12 by means of locking pieces 67 provided on the lower surface of the sole 62, wherein the structure of the locking pieces 67 and the structure of the connection between the soles 62 and the foothold 12 are the same as those of the conventional locking shoes, and further, the locking pieces 67 provided on the same sole 62 correspond to the positions of the pressure sensor 20 and the element case 66 (see the dotted line in fig. 4), and are provided in the half sole portion of the sole 62, which contributes to the improvement of the accuracy of the pressure detection.
In addition, the microprocessor 40 needs to be connected with a switch for controlling the microprocessor 40 to be turned on or off, the specific arrangement position and structure of the switch are conventional, for example, the switch can be arranged on an external terminal, or the switch can be arranged on a shoe lock, or the switch can be arranged on a stopwatch of a bicycle, etc.
Before the detection system of the present embodiment is used, the length r of the crank 11 and one or more predetermined angles θ need to be input into the microprocessor 40 in advance, in the present embodiment, there are three predetermined angles θ, which are 30 °, 90 ° and 120 °, respectively, of course, the length r of the crank 11 only needs to be input once without replacing the crank 11 of the bicycle or the bicycle, and then the microprocessor 40 calculates, according to the length r and the predetermined angles θ, the respective vertical distances L1 between the position of the pedal 12 corresponding to the crank 11 and the upper limit position of the pedal and the respective vertical distances L2 between the position of the other pedal 12 and the lower limit position of the pedal when one of the cranks 11 and the vertical plane form the respective predetermined angles θ, that is, there are three distances L1 and L2, respectively. In addition, in the case of ensuring that the length of the crank 11 is not changed, it is also possible to input, to the microprocessor 40, one or more predetermined angles θ and, when one of the cranks 11 is at each predetermined angle θ from the vertical, each interval L1 in the vertical direction between the position of the foothold 12 corresponding to the crank 11 and the upper limit position of the foothold and each interval L2 in the vertical direction between the position of the other foothold 12 and the lower limit position of the foothold in advance, and directly store the data of the three intervals L1 and the three intervals L2 without calculation by the microprocessor 40. Of course, within the microprocessor 40, each of the predetermined angles θ is associated with the pitch L1 and the pitch L2 corresponding to the predetermined angle θ for the microprocessor 40 to call.
When stepping on, the microprocessor 40 determines the movement direction of the corresponding pedal 12 by integrating the acceleration acquired by each acceleration sensor 30 once to obtain the direction of the speed, specifically, the direction of the speed is determined by whether the value of the acceleration integrated once acquired by the acceleration sensor 30 is a positive number or a negative number, when the speed is the positive number, the corresponding pedal 12 moves from the upper limit position to the lower limit position, otherwise, the corresponding pedal 12 moves from the lower limit position to the upper limit position. The microprocessor 40 determines the moving direction of the corresponding pedal 12, and calculates the displacement s1 in the vertical direction between the position of the pedal moving from the upper limit position to the lower limit position at the current time and the upper limit position and the displacement s2 in the vertical direction between the position of the other pedal at the current time and the lower limit position by twice integrating the values of the acceleration obtained by the acceleration sensors 30. Then, the microprocessor 40 compares the value of L1+ L2 with the value of S1+ S2, and when the two values are the same, obtains the pressure P1 applied to the pedals 12 moving from the upper limit position to the lower limit position at the current moment and the pressure P2 applied to the other pedals 12 through the corresponding pressure sensors 20, and calculates and obtains the pedaling efficiency of one of the cranks at the predetermined angle θ corresponding to the vertical plane according to the pressure P1 and the pressure P2. It should be noted that, since the road surface cannot be absolutely horizontal when the bicycle is running, and there is inevitably a change in the slope, in this case, the displacement in the vertical direction calculated from the detected data of the single acceleration sensor 30 is affected by the change in the slope, however, since the moving directions of the two pedals 12 of the bicycle are opposite and the magnitudes of the displacements are the same, when the sum of the displacements is calculated, the influence of the slope is cancelled out, and the calculation result is not affected.
The user can receive the data of the pedaling efficiency of the bicycle obtained by the microprocessor 40 through an external terminal (such as a mobile phone, etc.), and integrate and summarize the data, and respectively summarize the average pedaling force and pedaling force floating curve generated by the left foot or the right foot which is pedaled downwards when the pedal 12 is at the positions of 30 degrees, 90 degrees and 120 degrees and the average force and force floating curve generated by the left foot or the right foot which moves upwards when the pedal 12 is at the positions of 30 degrees to 120 degrees, wherein the average force and force floating curve is respectively summarized by taking the left foot and the right foot as a unit and is used for the riding training.
Preferably, in this embodiment, the microprocessor 40 may further perform a first integration according to the acceleration obtained by each acceleration sensor 30 to obtain the direction and the speed change of the speed of the corresponding pedal 12, determine whether the corresponding pedal 12 passes through the lower limit position of the pedal according to the obtained direction and speed change, record the number of times and the time when the corresponding pedal 12 passes through the lower limit position of the pedal 12, and calculate the motion data such as the pedaling smoothness, the pedaling force efficiency, and the average pedaling force according to the obtained motion data. Specifically, the upper limit position is a turning point of the pedal 12 moving from upward to downward, and at a critical point (i.e., the upper limit position), the vertical upward velocity is reduced to 0 (the velocity can be obtained by integrating the acceleration by the microprocessor 40), and similarly, the lower limit position is a position at which the vertical downward velocity of the pedal 12 is reduced to 0. The specific calculation method of the motion data such as the pedaling smoothness, the pedaling force efficiency, the average pedaling force and the like is a conventional method, and certainly, the calculation needs to be performed in combination with the data of the bicycle stopwatch when necessary, which is not the focus of the embodiment and will not be described in detail here.
The present invention is described in detail with reference to the accompanying drawings, but the embodiments of the present invention are not limited to the above embodiments, and those skilled in the art can make various modifications to the present invention according to the prior art, for example, use other existing flexible sensors instead of the piezoelectric film sensor in the above embodiments, and so on, and these are within the scope of the present invention.
Claims (10)
1. A method for detecting the treading efficiency of a bicycle is provided with a chain wheel, two cranks and pedals, wherein one ends of the cranks are fixedly connected to two sides of the chain wheel respectively, the pedals are rotatably connected to the other ends of the two cranks respectively, one end of each crank, which is connected with the chain wheel, is located at the axis position of the chain wheel, and the two cranks are the same in length and located on the same straight line, and the method is characterized by comprising the following steps of:
s1, calculating a vertical distance L1 between the position of the pedal corresponding to the crank and the upper limit position of the pedal and a vertical distance L2 between the position of the other pedal and the lower limit position of the pedal when the crank forms a preset angle theta with the vertical plane according to the length r of the crank;
s2, detecting the movement time and the change of the acceleration in the vertical direction of the pedal moving from the upper limit position to the lower limit position from the last time to the current time, and calculating the displacement S1 in the vertical direction between the position of the pedal at the current time and the upper limit position, detecting the movement time and the change of the acceleration in the vertical direction from the last time to the current time, and calculating the displacement S2 in the vertical direction between the position of the pedal at the current time and the lower limit position;
s3, comparing the value of L1+ L2 with the value of S1+ S2, if the two values are the same, detecting the pressure P1 received by the pedal moving from the upper limit position to the lower limit position and the pressure P2 received by the other pedal at the current moment, and calculating the pedaling efficiency according to the pressure P1 and the pressure P2.
2. The method for detecting pedaling efficiency of a bicycle according to claim 1, wherein the calculation formula of the distance L1 and the distance L2 is L-r (1-cos θ), wherein L-L1 or L-L2.
3. The bicycle pedaling efficiency detecting method according to claim 1, wherein the predetermined angle θ is 30 °, 90 ° or 120 °.
4. A bicycle trampling efficiency detection system comprises a chain wheel, two cranks and pedals, wherein one ends of the cranks are fixedly connected to two sides of the chain wheel respectively, the pedals are rotatably connected to the other ends of the two cranks respectively, one ends of the cranks, which are connected with the chain wheel, are located at the axis position of the chain wheel, and the two cranks are identical in length and located on the same straight line;
inputting the length r of the crank and more than one preset angle theta into the microprocessor in advance, and calculating each interval L1 in the vertical direction between the position of the pedal corresponding to the crank and the upper limit position of the pedal and each interval L2 in the vertical direction between the position of the other pedal and the lower limit position of the pedal when one crank forms each preset angle theta with the vertical plane according to the length r and each preset angle theta by the microprocessor; or inputting more than one preset angle theta and each interval L1 between the position of the pedal corresponding to one crank and the upper limit position of the pedal and each interval L2 between the position of the other pedal and the lower limit position of the pedal in the vertical direction when the crank forms each preset angle theta into the microprocessor in advance;
when stepping on, the microprocessor judges the movement direction of the corresponding pedal according to the acceleration acquired by each acceleration sensor, and calculates a displacement s1 in the vertical direction between the position of the pedal moving from the upper limit position to the lower limit position at the current moment relative to the upper limit position and a displacement s2 in the vertical direction between the position of the other pedal at the current moment relative to the lower limit position according to the numerical value of the acceleration acquired by each acceleration sensor; then the microprocessor compares the value of L1+ L2 with the value of S1+ S2, when the two values are the same, the pressure P1 received by the pedal moving from the upper limit position to the lower limit position at the current moment and the pressure P2 received by the other pedal are obtained through the corresponding pressure sensors, and the bicycle pedaling efficiency when one crank forms the preset angle theta corresponding to the vertical plane is obtained through calculation according to the pressure P1 and the pressure P2.
5. The bicycle pedaling efficiency detecting system according to claim 4, wherein the microprocessor is connected with a wireless communication module or a connection port for communication connection with an external terminal.
6. The bicycle pedaling efficiency detecting system according to claim 4, further comprising a locking shoe, wherein said locking shoe comprises a shoe body respectively mounted on each of said pedals, and each of said pressure sensors and each of said acceleration sensors is respectively mounted on the corresponding said shoe body.
7. The bicycle pedaling efficiency detecting system according to claim 6, wherein each of the shoe bodies comprises a sole and an auxiliary band, the sole is provided with a placement groove, an element box is placed in the placement groove, the auxiliary band is located between the element box and a groove bottom of the placement groove, both ends of the auxiliary band respectively penetrate out of the placement groove, the corresponding acceleration sensor is installed in the element box on the corresponding shoe body, and the corresponding pressure sensor is installed on an upper surface of the sole of the corresponding shoe body.
8. The bicycle pedaling efficiency detecting system according to claim 7, wherein each of said soles is connected to the corresponding pedal by a locking piece, and the positions of said locking piece and said pressure sensor on the same sole are corresponded to each other.
9. The bicycle pedaling efficiency detecting system according to any one of claims 4-8, wherein each of said pressure sensors is a piezoelectric film sensor and each of said acceleration sensors is a MEMS acceleration sensor.
10. The bicycle pedaling efficiency detecting system according to any one of claims 4-8, wherein said microprocessor performs an integration operation according to the acceleration obtained by each of said acceleration sensors to obtain the direction and speed variation of the corresponding speed of said pedals, and accordingly determines whether the corresponding pedal passes the lower limit position of the pedal, and records the number of times and time that the pedal passes the lower limit position of the pedal.
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