CN106153231B - Torque detection system - Google Patents

Abstract

A torque detection system is used to detect the torque generated by a torque generating mechanism when a torque application device connected to a fixed seat applies resistance. The torque detection system includes an angle detection module and a computing device. The angle detection module is arranged on the torque application device and outputs a voltage signal. The voltage signal changes as the torque application device moves relative to the fixed seat. The computing device receives the voltage signal and selects a torque value according to the voltage signal by looking up a table. The torque value corresponds to the torque of the torque generating mechanism. The present invention uses non-contact sensing means to perform torque detection, and the accuracy of torque detection is not affected by long-term use.

Description

Torque detection system

technical field

The invention relates to a torsion detection system, in particular to a torsion detection system applied to sports equipment such as exercise bikes to detect the set torsion of the sports equipment.

Background technique

The existing exercise bike mainly includes a vehicle frame, a flywheel and an adjusting rod, and the user can change the torque applied to the flywheel by rotating the adjusting rod. In order for the user to know the torque of the currently set flywheel, the existing exercise bike is usually provided with a torque detection device. The existing torque detection device adopts a variable resistance type torque detection device, which includes a variable resistor, and detects the resistance value of the variable resistor through a controller, and the controller detects the resistance value of the variable resistor according to the resistance value. Change to judge the size of the torque of the flywheel. However, the variable resistor is a contact adjustment structure, and after repeated operations, the resistance value of the variable resistor is easily affected by contact wear, which reduces the accuracy of torque adjustment detection.

Contents of the invention

The main purpose of the present invention is to provide a torsion detection system to solve the problem that the accuracy of the existing contact type torsion detector is reduced due to repeated operations.

The torque detection system of the present invention is used to detect the magnitude of the torque generated when a torque generating mechanism is connected to a fixed seat to apply resistance, and the torque detection system includes:

An angle detection module is arranged on the torque acting device and outputs a voltage signal, so as to change the magnitude of the voltage signal as the torque acting device moves relative to the fixed seat;

An arithmetic device is electrically connected to the angle detection module to receive the voltage signal, and selects a torque value according to the voltage signal through a look-up table, and the torque value corresponds to the torque value of the torque generating mechanism.

According to the torque detecting system of the present invention, when the torque applying device moves relative to the fixed base, the torque of the torque generating mechanism can be changed, and at the same time, the tilt angle of the angle detecting module also changes accordingly to change the magnitude of the voltage signal. According to the size of the voltage signal, the corresponding torque value can be selected by means of a look-up table. Therefore, the present invention uses a non-contact sensing method to detect torque, which does not affect the accuracy of torque detection due to long-term operation, and naturally does not have the problem of affecting detection accuracy due to contact wear when using variable resistors. .

Description of drawings

FIG. 1 is a schematic plan view of a preferred embodiment of the torque detection system of the present invention installed on an exercise bike.

Fig. 2 is a partial cross-sectional schematic diagram of the exercise bike shown in Fig. 1 .

Fig. 3 is a partial three-dimensional schematic diagram of the torsion acting device and the adjusting rod in the exercise bike shown in Fig. 1 .

FIG. 4 is a schematic diagram of rotating the adjusting rod in FIG. 2 to change the position of the torsion acting device.

FIG. 5 is a circuit block diagram of the first preferred embodiment of the torque detection system of the present invention.

FIG. 6 is a circuit block diagram of a second preferred embodiment of the torque detection system of the present invention.

FIG. 7 is a circuit block diagram of a third preferred embodiment of the torque detection system of the present invention.

FIG. 8 is a schematic plan view of four preferred embodiments of the torque detection system of the present invention installed on an exercise bike.

FIG. 9 is a circuit block diagram of a fourth preferred embodiment of the torque detection system of the present invention.

FIG. 10 is a circuit block diagram of a fifth preferred embodiment of the torque detection system of the present invention.

Description of main component symbols:

100 exercise bike 11 torque generating mechanism

12 Fixing seat 121 Fixing piece

122 Hollow sleeve 13 Torsion acting device

131 Seat body 132 Resistance piece

133 Connector 134 Pivot

135 Screw hole 14 Adjusting rod

141 Body 142 Head

143 Groove 144 Bolt

145 External thread segment 20 Angle detection module

21 Computing device 211 Analog/digital converter

212 Microcontroller 213 Torque comparison table

214 Difference Amplifier 215 Voltage Source

216 Digital/Analog Converter 217 Voltage Adder

218 Voltage source 22 Auxiliary detection module

Detailed ways

The torque detecting system of the present invention is used to detect the magnitude of the torque generated when a torque generating mechanism is connected to a fixed seat to apply resistance. Please refer to Fig. 1, the present invention can be applied to an exercise bike 100, but not limited thereto, the torque generating mechanism 11, the fixing seat 12 and the torsion acting device 13 are the existing structures of the exercise bike 100, in order to match this Regarding the description of the inventive torque detection system, the structure of the exercise bike 100 is briefly described below. The torque generating mechanism 11 can be the flywheel of the exercise bike 100 , and the fixing base 12 can be the frame of the exercise bike 100 .

Please refer to FIG. 2 and FIG. 3, the torsion device 13 includes a base 131, a resistance member 132 disposed in the base 131 and a connecting member 133 disposed on the base 131, the base 131 One end can be pivotally connected to a fixing part 121 of the fixing seat 12 through a pivot 134, and the torsion device 13 can rotate within a limited angle relative to the fixing part 121 with the pivot 134 as a fulcrum, and make the torsion effect The device 13 is movably sleeved on the torque generating mechanism 11, the resistance member 132 can contact the outer periphery of the torque generating mechanism 11 to provide frictional resistance, the connecting member 133 has a screw hole 135 and is located on the torque generating mechanism 11 outside. The fixing seat 12 can be provided with a hollow sleeve 122, and the hollow sleeve 122 is pierced by an adjusting rod 14. The adjusting rod 14 includes a rod body 141 and a rod head 142. The end of the bolt 144 passes through the hollow sleeve 122 and is located between the ring grooves 143, so that the rod body 141 can rotate at a certain point relative to the hollow sleeve 122, and the rod head 142 is arranged on the top of the rod body 141. The bottom end of 141 forms an external thread section 145 and is exposed to the hollow sleeve 122 . The screw hole 135 of the connecting piece 133 of the torsion acting device 13 is movably screwed to the external thread section 145 of the rod body 141 .

The user can hold the rod head 142 of the adjusting rod 14 and rotate the adjusting rod 14, so that the connecting piece 133 of the torsion acting device 13 moves up or down relative to the external thread section 145 of the rod body 141, thereby driving the torsion effect. The device 13 rotates with the pivot 134 as a fulcrum, thereby reducing or increasing the contact area between the resistance member 132 of the torque acting device 13 and the torque generating mechanism 11, so as to change the action of the resistance member 132 on the torque generating mechanism 11 Frictional resistance on. As shown in FIG. 4 , when the torque applying device 13 rotates downward around the pivot 134 , the contact area between the resistance member 132 and the torque generating mechanism 11 can be increased, thereby increasing the torque of the torque generating mechanism 11 . To sum up, the torque of the torque generating mechanism 11 is proportional to the resistance applied by the resistance member 132 to the torque generating mechanism 11. When the torque of the torque generating mechanism 11 is greater, it means that the user needs to use more force. The exercise bike 100 can only be stepped on to make the torque generating mechanism 11 rotate with a certain strength.

In another embodiment, the resistance member 132 of the torque acting device 13 can be replaced by a magnet assembly (not shown in the figure), and the magnet assembly can be arranged on the base body 131 of the torque acting device 13 without contacting the torque generating mechanism 11 , the torque generating mechanism 11 is provided with magnetic resistance by the magnet assembly. For example, as the torsion force device 13 rotates downward with the pivot 134 as a fulcrum, the magnetic lines of force of the magnet assembly in the torsion force generating mechanism 11 are increased to increase the magnetic resistance, thereby increasing the torsion force of the torsion force generating mechanism 11 .

Please refer to FIG. 1 and FIG. 5 , the torque detection system of the present invention includes an angle detection module 20 and a computing device 21 . The angle detection module 20 can be a gravitational accelerometer (G sensor), which is arranged on the torsion device 13. An inclination angle relative to a reference direction (such as the direction of gravity acceleration) generates a voltage signal V1, and the inclination angle and the voltage signal V1 can be proportional or inversely proportional, wherein the voltage signal V1 is an analog signal. For example, please refer to FIG. 2, when the torque acting device 13 is in an initial position, the resistance member 132 does not contact the torque generating mechanism 11, and the torque generating mechanism 11 provides a minimum torque, at this moment, the angle detection module 20 The generated voltage signal V1 may be a minimum value. Please refer to FIG. 4 , when the torsion device 13 rotates downward with the pivot 134 as the fulcrum, the resistance member 132 contacts the torsion generating mechanism 11 to gradually increase the torque, and the angle detection module 20 follows the torsion device 13 Rotate and move, so that the tilt angle increases gradually, and the magnitude of the voltage signal V1 can be increased gradually. In other words, the magnitude of the voltage signal V1 generated by the angle detection module 20 is related to the magnitude of the torque of the torque generating mechanism 11 . The computing device 21 is electrically connected to the angle detection module 20 to receive the voltage signal V1, and selects a torque value according to the voltage signal V1 through a look-up table, and the torque value corresponds to the torque value of the torque generating mechanism 11 .

As shown in FIG. 5 , the first preferred embodiment of the torque detection system of the present invention, the computing device 21 includes an analog/digital converter 211 and a microcontroller 212 . The analog/digital converter 211 is electrically connected to the angle detection module 20 to receive the voltage signal V1 and digitize the voltage signal V1 into a value Sa. The microcontroller 212 is electrically connected to the output end of the analog/digital converter 211 to receive the value Sa. The microcontroller 212 stores a torque comparison table 213. The torque comparison table 213 includes a plurality of values corresponding to these Numeric torque value. Therefore, the microcontroller 212 selects a corresponding torque value in the torque comparison table 213 according to the numerical value Sa received from the analog/digital converter 211, and the torque value corresponds to the current torque value of the torque generating mechanism 11. Torque size. The way of establishing the torque comparison table 213 will be described later.

Please refer to the second preferred embodiment of the torque detection system of the present invention shown in FIG. The input terminal (-), a second input terminal (+) and an output terminal, the first input terminal (-) receives a reference signal Vref, and the reference signal Vref is a constant value. In the second preferred embodiment, the first input terminal (-) can be connected to a voltage source 215, and the voltage source 215 generates a fixed DC voltage as the reference signal Vref. The second input terminal (+) is electrically connected to the angle detection module 20 to receive the voltage signal V1, and the differential amplifier 214 generates a differential signal D1 at the output terminal according to the voltage signal V1 and the reference signal Vref. The input terminal of the analog/digital converter 211 is electrically connected to the output terminal of the differential amplifier 214 to receive the differential signal D1, and convert the differential signal D1 into a differential value S1, and the microcontroller 212 is electrically connected to The output terminal of the analog/digital converter 211 receives the differential value S1, and the microcontroller 212 selects a torque value from the torque comparison table 213 according to the differential value S1, and the torque value corresponds to the torque generated by the torque. The current torsion force of mechanism 11. The way of establishing the torque comparison table 213 will be described later.

Please refer to the third preferred embodiment of the torque detection system of the present invention shown in FIG. An output terminal of the microcontroller 212 is electrically connected to the first input terminal (-) of the differential amplifier 214, and the microcontroller 212 generates the reference signal Vref to the differential amplifier 214 through the digital/analog converter 216 . The differential amplifier 214 outputs a differential signal D2 to the analog/digital converter 211 according to the voltage signal V1 and the reference signal Vref, and the analog/digital converter 211 converts the differential signal D2 into a differential value S2, The microcontroller 212 selects a torque value from the torque comparison table 213 according to the differential value S2 , and the torque value corresponds to the current torque value of the torque generating mechanism 11 . The way of establishing the torque comparison table 213 will be described later.

Please refer to FIG. 8 , the torque detection system may further include an auxiliary detection module 22 disposed on the fixing base 12 , and the auxiliary detection module 22 may also be a gravity accelerometer (G sensor). Since the fixing base 12 is fixed on the ground and does not change its position with the user's operation, the auxiliary detection module 22 can output a fixed voltage signal.

Based on the angle detection module 20 and the auxiliary detection module 22 in Figure 8, please refer to the fourth preferred embodiment of the torque detection system of the present invention shown in Figure 9, the angle detection module 20 and the auxiliary detection module 22 are set in the same direction, the The computing device 21 includes the aforementioned differential amplifier 214, analog/digital converter 211, and microcontroller 212. The first input terminal (-) of the differential amplifier 214 is electrically connected to the auxiliary detection module 22, because the fixing base 12 It is fixed so that the auxiliary detection module 22 can output a fixed voltage signal as the reference signal Vref for the first input terminal (−) of the differential amplifier 214 to receive the reference signal Vref. The differential amplifier 214 outputs a differential signal D3 to the analog/digital converter 211 according to the voltage signal V1 of the angle detection module 20 and the reference signal Vref of the auxiliary detection module 22, and the analog/digital converter 211 takes the difference The dynamic signal D3 is converted into a differential value S3, and the microcontroller 212 selects a torque value from the torque comparison table 213 according to the differential value S3, and the torque value corresponds to the current torque value of the torque generating mechanism 11. The way of establishing the torque comparison table 213 will be described later.

Based on the angle detection module 20 and the auxiliary detection module 22 in FIG. 8 , the fifth preferred embodiment of the torque detection system of the present invention is shown in FIG. 10 , wherein the angle detection module 20 and the auxiliary detection module 22 are set oppositely. The computing device 21 includes a voltage adder 217, the aforementioned differential amplifier 214, an analog/digital converter 211, and a microcontroller 212. The two input terminals of the voltage adder 217 are electrically connected to the angle detection module 20 and the auxiliary detection module respectively. In the module 22 , the first input terminal (−) of the differential amplifier 214 can be connected to a voltage source 218 to receive the reference signal Vref, and the second input terminal (+) is electrically connected to the output terminal of the voltage adder 217 . The voltage adder 217 sums the voltage signal V1 generated by the angle detection module 20 and the voltage signal V2 generated by the auxiliary detection module 22 to generate a total voltage signal V3, and the differential amplifier 214 generates a total voltage signal V3 according to the total voltage signal V3 and the The reference signal Vref outputs a differential signal D4 to the analog/digital converter 211, and the analog/digital converter 211 converts the differential signal D4 into a differential value S4, and the microcontroller 212 according to the differential value S4 A torque value is selected from the torque comparison table 213 , and the torque value corresponds to the current torque value of the torque generating mechanism 11 . The way of establishing the torque comparison table 213 will be described later.

Regarding the establishment of each torque comparison table 213 in the aforementioned first to fifth preferred embodiments, before the exercise bike 100 with the torque detection device of the present invention leaves the factory, the manufacturer can rotate the adjustment lever 14 to change the torque generating mechanism 11 and record the value Sa or differential values S1, S2, S3, S4 generated by the computing device 21 in each stage, and use a torque meter (torque sensor) to measure and record the torque generating mechanism 11 at each stage Corresponding actual torque value in one stage. After completing a series of measurements, the manufacturer can obtain a plurality of values Sa (or differential values S1, S2, S3, S4) and corresponding to these values Sa (or differential values S1, S2, S3, S4). For complex torque values, the manufacturer can write these values Sa (or differential values S1, S2, S3, S4) and torque values into the microcontroller 212 through a computer and a programming device to establish the torque comparison table 213. The comparison table 213 can be shown in the following table, wherein the numbers in the following table are for illustrative purposes only. In general, these numbers (or differential values) are linearly related to torque values.

Value Sa (or differential value S1, S2, S3, S4) Torque value 1 5 2 10 3 15 4 20

After the exercise bike 100 leaves the factory, the microcontroller 212 has the torque comparison table 213 . Before the user uses the aforementioned exercise bike 100 to exercise, the user can rotate the adjusting rod 14 according to his physical condition or training intensity to adjust the torque of the torque generating mechanism 11 . After adjustment, assuming that the value Sa (or differential values S1, S2, S3, S4) received by the microcontroller 212 from the analog/digital converter 211 is 2, the corresponding torque value is 10, thereby achieving torque purpose of detection. The microcontroller 212 can present the torque value to the user through a display, so that the user can know the torque value currently set in the torque generating mechanism 11 .

In the second to fifth preferred embodiments, through the configuration of the differential amplifier 214 , noise interference can be reduced, and the tolerance of assembly errors of the angle detection module 20 or the auxiliary detection module 22 can be improved. Furthermore, even if the manufacturing environment of the exercise bike 100 is different from the use environment, for example, the exercise bike 100 is placed on a horizontal plane during manufacture, and the exercise bike 100 is placed on an inclined plane when the user uses it. For the third preferred embodiment, the user only needs to adjust the magnitude of the reference voltage Vref to eliminate the error caused by the tilt of the exercise bike 100 .

For the fourth preferred embodiment, the differential signal generated by the differential amplifier 214 is the relative signal between the voltage signal V1 and the reference signal Vref. If the exercise bike 100 is placed on an inclined plane, the angle detection module 20 It is inclined synchronously with the auxiliary detection module 22, because the angle detection module 20 and the auxiliary detection module 22 are set in the same direction, so that the variation of the voltage signal V1 and the reference signal Vref respectively output by the two are equal, then the differential amplifier 214 The relative signal generated is not affected by tilt, so errors caused by the tilt of the exercise bike 100 can be eliminated.

For the fifth preferred embodiment, if the exercise bike 100 is placed on an inclined plane, although the angle detection module 20 and the auxiliary detection module 22 are tilted synchronously, the angle detection module 20 and the auxiliary detection module 22 are opposite. Direction setting, for example, assuming that the voltage signal V1 of the angle detection module 20 adds a positive variation due to the tilt, and the voltage signal V2 of the auxiliary detection module 22 also adds a negative variation due to the tilt, the The positive variation and the negative variation are equal in magnitude and cancel each other out, so that the total voltage signal V3 generated by the voltage adder 217 can eliminate the error caused by the tilt of the exercise bike 100 .

Claims (1)

1. a kind of torque detection system, the twisting force device for being connected a fixing seat for detecting a torsion generation mechanism The torque magnitude generated when applying resistance, which is characterized in that the torque detection system includes:

One angle detection module is set on the twisting force device, and the angle detection module is according to the twisting force device phase The direction rotated to the torsion generation mechanism is mobile to change tilt angle, and the angle detection module inclines according to what is changed Rake angle export a voltage signal, with the twisting force device with respect to the fixing seat move when change the big of the voltage signal Small, which is a gravitational accelerometer；

One arithmetic unit is electrically connected the angle detection module to receive the voltage signal；

Wherein, which includes:

One analog/digital converter, is electrically connected the angle detection module, which is converted to a numerical value；

One microcontroller is electrically connected the analog/digital converter, which stores a torsion table of comparisons, should with basis Numerical value selects the torque value from the torsion table of comparisons, which corresponds to the torque magnitude of the torsion generation mechanism.