Method and device for controlling the resistance of an electromagnet of an exercise bicycle

Abstract

The application relates to the technical field of fitness equipment, and discloses an electromagnet resistance control method and device of a fitness bike, which comprises the following steps: signal analysis is performed on a resistance adjustment instruction to obtain an instruction signal and determine an adjustment resistance value of the fitness bike; a current resistance value of the fitness bike is inquired, and a current magnetic field intensity corresponding to the electromagnet is calculated; a circuit system of the fitness bike is acquired, circuit characteristics of the circuit system are analyzed, a bridge circuit is constructed in the circuit system, the resistance adjustment direction of the electromagnet is judged, the increased magnetic field intensity of the electromagnet is calculated, the circuit control scheme of the bridge circuit is formulated by combining the current magnetic field intensity and the increased magnetic field intensity, a first control scheme is obtained; the decreased magnetic field intensity of the electromagnet is calculated, the circuit control scheme of the bridge circuit is formulated by combining the current magnetic field intensity and the decreased magnetic field intensity, a second control scheme is obtained; resistance control of the fitness bike is performed, and a resistance control result is obtained. The application is characterized in that the electromagnet resistance control accuracy of the fitness bike is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fitness equipment, in particular to a method and device for controlling the resistance of an electromagnet of a fitness bike. BACKGROUND

[0002] A fitness bike is a fitness device that is used to exercise by imitating the action of riding a bicycle. In use, the fitness bike can set different resistance levels according to the needs of the user, and in order to achieve better exercise results, the fitness bike will have different resistance adjustment control methods, all of which use electromagnets to achieve resistance control.

[0003] However, the existing electromagnet resistance control method of the fitness bike mainly uses a triode power tube or MOS tube to drive the electromagnet. However, the triode power tube or MOS tube generates a back electromotive force when it operates, which causes the electromagnet to generate a lot of heat. Therefore, heat sinks must be used to dissipate heat. However, when the temperature is too high, the accuracy of the electromagnet resistance control will be reduced. Therefore, a method is needed to improve the accuracy of the electromagnet resistance control of the fitness bike. SUMMARY

[0004] The present application provides a method and device for controlling the resistance of an electromagnet of a fitness bike, which mainly aims to improve the accuracy of the electromagnet resistance control of the fitness bike.

[0005] To achieve the above-mentioned purpose, the present application provides a method for controlling the resistance of an electromagnet of a fitness bike, which comprises:

[0006] receiving a resistance adjustment instruction of the fitness bike, signal analyzing the resistance adjustment instruction to obtain an instruction signal, and determining an adjustment resistance value of the fitness bike according to the instruction signal;

[0007] collecting the current characteristic parameters corresponding to the electromagnet of the fitness bike, querying the current resistance value of the fitness bike, combining the current resistance value and the current characteristic parameters, and calculating the current magnetic field intensity corresponding to the electromagnet;

[0008] obtaining the circuit system of the fitness bike, analyzing the circuit characteristics of the circuit system, constructing a bridge circuit in the circuit system according to the circuit characteristics, and determining the resistance adjustment direction of the electromagnet, wherein the resistance adjustment direction includes increasing the resistance and reducing the resistance;

[0009] If the resistance adjustment direction is to increase the resistance, then according to the adjustment resistance value, the increased magnetic field intensity of the electromagnet is calculated, and combining the current magnetic field intensity and the increased magnetic field intensity, a circuit control scheme of the bridge circuit is formulated to obtain a first control scheme;

[0010] If the resistance adjustment direction is to reduce the resistance, a reduced magnetic field intensity of the electromagnet is calculated according to the adjustment resistance value, a circuit control scheme of the bridge circuit is formulated in combination with the current magnetic field intensity and the reduced magnetic field intensity, and a second control scheme is obtained;

[0011] According to the first control scheme and the second control scheme, resistance control of the exercise bicycle is performed, and a MOS tube temperature on the exercise bicycle is measured in real time, and a resistance control result is obtained according to the MOS tube temperature.

[0012] Optionally, the signal analysis on the resistance adjustment instruction to obtain an instruction signal comprises:

[0013] An instruction electrical signal corresponding to the resistance adjustment instruction is acquired, and a noise reduction processing is performed on the instruction electrical signal to obtain a noise reduction instruction electrical signal;

[0014] A quantization processing is performed on the noise reduction instruction electrical signal to obtain a quantization instruction electrical signal;

[0015] An encoding processing is performed on the quantization instruction electrical signal to obtain an encoded instruction electrical signal;

[0016] A feature extraction is performed on the encoded instruction electrical signal to obtain a signal feature;

[0017] According to the signal feature, a signal output is performed on the encoded instruction electrical signal to obtain an instruction signal.

[0018] Optionally, the feature extraction on the encoded instruction electrical signal to obtain a signal feature comprises:

[0019] A signal frame processing is performed on the encoded instruction electrical signal to obtain a frame electrical signal;

[0020] A signal value corresponding to the frame electrical signal is calculated, and according to the signal value, a feature value of the encoded instruction electrical signal is calculated;

[0021] According to the feature value, a feature extraction is performed on the encoded instruction electrical signal to obtain a signal feature.

[0022] Optionally, the acquisition of the current feature parameter corresponding to the electromagnet of the exercise bicycle comprises:

[0023] A parameter index of the electromagnet of the exercise bicycle and a resistance adjustment mechanism corresponding to the electromagnet are acquired, and according to the resistance adjustment mechanism, a resistance adjustment index of the electromagnet is analyzed;

[0024] A correlation coefficient between the resistance adjustment indexes is calculated, and according to the correlation coefficient, a linear index corresponding to the electromagnet adjustment resistance is determined;

[0025] According to the linear index, the parameter index is screened to obtain a target parameter index, and a parameter corresponding to the target parameter index is extracted to obtain a current index parameter;

[0026] A weight coefficient corresponding to each parameter in the current index parameter is calculated, and according to the weight coefficient, a current characteristic parameter in the index parameter is extracted.

[0027] Optionally, the calculation of the correlation coefficient between the resistance adjustment indexes comprises:

[0028] The correlation coefficient between the resistance adjustment indexes is calculated by the following formula:

[0029]

[0030] Wherein, D represents the correlation coefficient between the resistance adjustment indexes, i and i+1 represent the serial numbers of the resistance adjustment indexes respectively, μ represents the number of the resistance adjustment indexes, A i represents the vector value corresponding to the i th index in the resistance adjustment index, lnA i represents the logarithmic value corresponding to the vector value of the i th index in the resistance adjustment index, A i+1 represents the vector value corresponding to the i+1 th index in the resistance adjustment index, lnA i+1 represents the logarithmic value corresponding to the vector value of the i+1 th index in the resistance adjustment index, and α represents the vector dimension.

[0031] Optionally, the combination of the current resistance value and the current characteristic parameter comprises:

[0032] The current characteristic parameter comprises a magnet current parameter, a magnet coil parameter and a magnet cross section parameter.

[0033] According to the magnet current parameter and the magnet coil parameter, the current magnetic flux of the electromagnet is calculated.

[0034] According to the current magnetic flux and the magnet cross section parameter, the current magnetic field strength of the electromagnet is calculated.

[0035] Optionally, the calculation of the current magnetic flux of the electromagnet according to the magnet current parameter and the magnet coil parameter comprises:

[0036] The current magnetic flux of the electromagnet is calculated by the following formula:

[0037] E = β 1 * I 1 + β 2 * I 2 … + β r * I r

[0038] Wherein, E represents the current magnetic flux of the electromagnet, β1, β2, β r respectively represent the first, second, and rth magnet coil in the magnet coil parameter, r represents the total number of magnet coils, I1 represents the current value of the first magnet coil in the magnet current parameter, I2 represents the current value of the second magnet coil in the magnet current parameter, and Ir represents the current value of the rth magnet coil in the magnet current parameter. r β1*I1 represents the magnetic flux corresponding to the first magnet coil, β2*I2 represents the magnetic flux corresponding to the second magnet coil, and β r *I r r represents the magnetic flux corresponding to the rth magnet coil.

[0039] Optionally, the circuit characteristics of the circuit system are analyzed, including:

[0040] A circuit topology graph corresponding to the circuit system is obtained, and circuit components in the circuit topology graph are identified;

[0041] The electrical characteristic parameters corresponding to the circuit components are extracted, and a circuit equation of the circuit system is constructed according to the electrical characteristic parameters and the circuit topology graph;

[0042] An equation value corresponding to the circuit equation is calculated, and a characteristic value in the circuit system is obtained according to the equation value;

[0043] According to the characteristic value, the circuit characteristics corresponding to the circuit system are analyzed.

[0044] Optionally, the increased magnetic field strength of the electromagnet is calculated according to the adjusted resistance value, including:

[0045] The increased magnetic field strength of the electromagnet is calculated by the following formula:

[0046]

[0047] Wherein, H represents the increased magnetic field strength of the electromagnet, μ0 represents the magnetic permeability of the electromagnet in vacuum, G represents the number of turns of the electromagnet coil, M a represents the adjusted resistance value, L represents the total length of the coil, and R represents the resistance value corresponding to the coil.

[0048] An electromagnet resistance control device of a fitness bike, characterized in that the device comprises:

[0049] A resistance value calculation module is configured to receive a resistance adjustment instruction of the fitness bike, perform signal analysis on the resistance adjustment instruction to obtain an instruction signal, and determine an adjusted resistance value of the fitness bike according to the instruction signal.

[0050] The magnetic field strength calculation module is configured to collect a current characteristic parameter corresponding to an electromagnet of the exercise bicycle, query a current resistance value of the exercise bicycle, and calculate a current magnetic field strength corresponding to the electromagnet in combination with the current resistance value and the current characteristic parameter.

[0051] The circuit construction module is configured to acquire a circuit system of the exercise bicycle, analyze a circuit characteristic of the circuit system, construct a bridge circuit in the circuit system according to the circuit characteristic, and determine a resistance adjustment direction of the electromagnet, the resistance adjustment direction including increasing resistance and reducing resistance.

[0052] The first scheme formulation module is configured to, if the resistance adjustment direction is to increase resistance, calculate an increased magnetic field strength of the electromagnet according to the adjusted resistance value, formulate a circuit control scheme of the bridge circuit in combination with the current magnetic field strength and the increased magnetic field strength, and obtain a first control scheme.

[0053] The second scheme formulation module is configured to, if the resistance adjustment direction is to reduce resistance, calculate a reduced magnetic field strength of the electromagnet according to the adjusted resistance value, formulate a circuit control scheme of the bridge circuit in combination with the current magnetic field strength and the reduced magnetic field strength, and obtain a second control scheme.

[0054] The resistance control execution module is configured to execute resistance control on the exercise bicycle according to the first control scheme and the second control scheme, measure a MOS tube temperature on the exercise bicycle in real time, and obtain a resistance control result according to the MOS tube temperature.

[0055] The application can understand the signal information contained in the resistance adjustment instruction by receiving the resistance adjustment instruction of the exercise bike, and can determine the adjustment resistance value of the exercise bike through the signal information. The application can better understand the performance parameters corresponding to the electromagnet by collecting the current characteristic parameters corresponding to the electromagnet, so as to facilitate subsequent calculation of the current magnetic field strength corresponding to the electromagnet. The application can improve the sensitivity of the circuit system by constructing a bridge circuit in the circuit system according to the circuit characteristics, so as to better realize the pushing of the electromagnet, and effectively eliminate the problem of back electromotive force. It should be understood that if the resistance adjustment direction is to increase the resistance, the application calculates the increased magnetic field strength of the electromagnet according to the adjustment resistance value, and then obtains the adjusted magnetic field strength required by the electromagnet to reach the adjustment resistance value, so as to facilitate subsequent formulation of the circuit control scheme of the bridge circuit, and better adjust the resistance of the exercise bike. The application can improve the accuracy of resistance control of the exercise bike by executing resistance control of the exercise bike according to the first control scheme and the second control scheme, and by measuring the MOS tube temperature on the exercise bike in real time. Therefore, the exercise bike electromagnet resistance control method and device provided by the embodiment of the application can improve the accuracy of the exercise bike electromagnet resistance control. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 A flowchart of an exercise bike electromagnet resistance control method is provided for an embodiment of the application.

[0057] Figure 2 A function module diagram of an exercise bike electromagnet resistance control device is provided for an embodiment of the application.

[0058] Figure 3 A structure diagram of an electronic device for implementing the exercise bike electromagnet resistance control method is provided for an embodiment of the application.

[0059] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0060] It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.

[0061] The embodiment of the present application provides an electromagnet resistance control method of an exercise bike. In the embodiment of the present application, the execution subject of the electromagnet resistance control method of the exercise bike includes but is not limited to at least one of electronic devices such as a server, a terminal and the like which can be configured to execute the method provided by the embodiment of the present application. In other words, the electromagnet resistance control method of the exercise bike can be executed by software or hardware installed in a terminal device or a server device, and the software can be a blockchain platform. The server includes but is not limited to a single server, a server cluster, a cloud server or a cloud server cluster and the like. The server can be a stand-alone server, or a cloud server providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (CDN), and basic cloud computing services such as big data and artificial intelligence platforms.

[0062] Referring to Figure 1 Fig. 1 is a flowchart of an electromagnet resistance control method of an exercise bike provided by an embodiment of the present application. In the embodiment, the electromagnet resistance control method of the exercise bike includes steps S1-S6.

[0063] S1, receiving a resistance adjustment instruction of an exercise bike, performing signal analysis on the resistance adjustment instruction to obtain an instruction signal, and determining an adjustment resistance value of the exercise bike according to the instruction signal.

[0064] The present application can understand the signal information contained in the resistance adjustment instruction by receiving the resistance adjustment instruction of the exercise bike and performing signal analysis on the resistance adjustment instruction, so as to facilitate subsequent determination of the adjustment resistance value of the exercise bike through the signal information. The resistance adjustment instruction is a command for adjusting the resistance of the exercise bike, such as a key or manually input instruction. The instruction signal is an electric signal corresponding to the resistance adjustment instruction.

[0065] As an embodiment of the present application, the signal analysis on the resistance adjustment instruction to obtain an instruction signal includes: obtaining an instruction electric signal corresponding to the resistance adjustment instruction, performing noise reduction processing on the instruction electric signal to obtain a noise reduction instruction electric signal, performing quantization processing on the noise reduction instruction electric signal to obtain a quantization instruction electric signal, performing encoding processing on the quantization instruction electric signal to obtain an encoded instruction electric signal, performing feature extraction on the encoded instruction electric signal to obtain a signal feature, performing signal output on the encoded instruction electric signal according to the signal feature to obtain an instruction signal.

[0066] The instruction electric signal is the electric signal corresponding to the resistance adjustment instruction, the noise reduction instruction electric signal is a signal obtained by filtering the instruction electric signal, the quantization instruction electric signal is a digital expression form of the noise reduction instruction electric signal, the encoding instruction electric signal is a signal expressed by a binary code of the quantization instruction electric signal, and the signal feature is a signal representation of the encoding instruction electric signal.

[0067] Further, as an optional embodiment of the present application, the signal feature is obtained by extracting the feature of the encoding instruction electric signal, including: performing signal frame processing on the encoding instruction electric signal to obtain a frame electric signal, calculating a signal value corresponding to the frame electric signal, calculating a feature value of the encoding instruction electric signal according to the signal value, and extracting the feature of the encoding instruction electric signal according to the feature value to obtain the signal feature.

[0068] The frame electric signal is a signal obtained by dividing the encoding instruction electric signal into several fixed lengths, the signal value represents the signal strength corresponding to the frame electric signal, and the feature value represents a feature numerical value corresponding to an index having a representation in the encoding instruction electric signal.

[0069] Optionally, the signal frame processing on the encoding instruction electric signal can be realized by a window function, the signal value corresponding to the frame electric signal can be calculated by Euler's formula, the feature value of the encoding instruction electric signal can be calculated by a feature value calculator, the feature value calculator is compiled by a script language, and the feature extraction of the encoding instruction electric signal can be performed according to the numerical value of the feature value.

[0070] The present application can obtain the specific adjustment resistance value of the exercise bike by determining the adjustment resistance value of the exercise bike according to the instruction signal, and then facilitating subsequent judgment of the resistance adjustment direction, wherein the adjustment resistance value is the resistance size that the exercise bike needs to adjust, and optionally, the adjustment resistance value of the exercise bike can be determined according to the information carried by the instruction signal.

[0071] S2, collect the current characteristic parameters corresponding to the electromagnet of the exercise bicycle, and query the current resistance value of the exercise bicycle, combine the current resistance value and the current characteristic parameters, and calculate the current magnetic field strength corresponding to the electromagnet.

[0072] The application can better understand the performance parameters corresponding to the electromagnet by collecting the current characteristic parameters corresponding to the electromagnet of the exercise bicycle, facilitating subsequent calculation of the current magnetic field strength corresponding to the electromagnet, wherein the current characteristic parameters are representative parameters of the electromagnet.

[0073] As an embodiment of the application, the collection of the current characteristic parameters corresponding to the electromagnet of the exercise bicycle comprises: obtaining parameter indicators of the electromagnet of the exercise bicycle and a resistance adjustment mechanism corresponding to the electromagnet, analyzing resistance adjustment indicators of the electromagnet according to the resistance adjustment mechanism, calculating correlation coefficients between the resistance adjustment indicators, determining linear indicators corresponding to the resistance adjustment of the electromagnet according to the correlation coefficients, screening the parameter indicators according to the linear indicators to obtain target parameter indicators, extracting parameters corresponding to the target parameter indicators to obtain current indicator parameters, calculating weight coefficients corresponding to each parameter in the current indicator parameters, and extracting current characteristic parameters in the indicator parameters according to the weight coefficients.

[0074] The parameter indicators are parameter items of the electromagnet of the exercise bicycle, such as the size of the electromagnet, the material of the electromagnet, and the current of the electromagnet, the resistance adjustment mechanism is the principle of the resistance adjustment of the electromagnet, the resistance adjustment indicators are related adjustment items when the electromagnet adjusts the resistance, such as adjusting the current and adjusting the number of turns of the electromagnet, the correlation coefficients represent the relevance between the resistance adjustment indicators, the current indicator parameters are parameter information corresponding to the target parameter indicators, and the weight coefficients represent the importance of each parameter in the current indicator parameters.

[0075] Optionally, the parameter indicators of the electromagnet of the exercise bicycle and the resistance adjustment mechanism corresponding to the electromagnet can be obtained from the Internet through human-computer interaction, the resistance adjustment indicators of the electromagnet can be obtained by analyzing the mechanism principle in the resistance adjustment mechanism, the linear indicators corresponding to the resistance adjustment of the electromagnet can be determined according to the numerical value of the correlation coefficients, the parameters corresponding to the target parameter indicators can be extracted by a parameter extraction tool, and the weight coefficients corresponding to each parameter in the current indicator parameters can be calculated by a principal component analysis method.

[0076] Further, as an optional embodiment of the application, the calculation of the correlation coefficients between the resistance adjustment indicators comprises:

[0077] The correlation coefficient between the resistance adjustment indexes is calculated by the following formula:

[0078]

[0079] Wherein, D represents the correlation coefficient between the resistance adjustment indexes, i and i+1 represent the serial numbers of the resistance adjustment indexes respectively, μ represents the number of the resistance adjustment indexes, A i represents the vector value corresponding to the i th index in the resistance adjustment index, lnA i represents the logarithmic value corresponding to the vector value of the i th index in the resistance adjustment index, A i+1 represents the vector value corresponding to the i+1 th index in the resistance adjustment index, lnA i+1 represents the logarithmic value corresponding to the vector value of the i+1 th index in the resistance adjustment index, and α represents the vector dimension.

[0080] The current magnetic field strength corresponding to the electromagnet is calculated by combining the current resistance value and the current characteristic parameter, and then the current magnetic field strength of the electromagnet is obtained, so as to subsequently judge the resistance adjustment direction of the electromagnet, wherein the current magnetic field strength is the magnetic field strength of the electromagnet after being powered on.

[0081] As an embodiment of the present application, the combination of the current resistance value and the current characteristic parameter, and the calculation of the current magnetic field strength corresponding to the electromagnet, includes that the current characteristic parameter includes magnet current parameter, magnet coil parameter and magnet cross section parameter, the current magnetic flux of the electromagnet is calculated according to the magnet current parameter and the magnet coil parameter, and the current magnetic field strength of the electromagnet is calculated according to the current magnetic flux and the magnet cross section parameter.

[0082] Wherein, the magnet current parameter is the current value of the electromagnet, the magnet coil parameter is the number of coils wound on the outer surface of the electromagnet, and the magnet cross section parameter is the effective cross section area corresponding to the electromagnet, the current magnetic flux is the number of magnetic field lines of the magnetic field generated by the electromagnet passing through a given area, and the current magnetic field strength of the electromagnet can be obtained by calculating the ratio of the current magnetic flux and the magnet cross section parameter.

[0083] Further, as an optional embodiment of the present application, the calculation of the current magnetic flux of the electromagnet according to the magnet current parameter and the magnet coil parameter includes:

[0084] The current magnetic flux of the electromagnet is calculated by the following formula:

[0085] E=β1*I1+β2*I2…+β r *Ir

[0086] Wherein, E represents the current magnetic flux of the electromagnet, β1, β2, β r respectively represent the first, second, and rth magnet coil in the magnet coil parameter, r represents the total number of magnet coils, I1 represents the current value of the first magnet coil in the magnet current parameter, I2 represents the current value of the second magnet coil in the magnet current parameter, and I r represent the current value of the rth magnet coil in the magnet current parameter, β1*I1 represents the magnetic flux corresponding to the first magnet coil, β2*I2 represents the magnetic flux corresponding to the second magnet coil, and β r *I r represent the magnetic flux corresponding to the rth magnet coil.

[0087] S3, obtain the circuit system of the exercise bike, analyze the circuit characteristics of the circuit system, construct a bridge circuit in the circuit system according to the circuit characteristics, and determine the resistance adjustment direction of the electromagnet, the resistance adjustment direction including: increasing the resistance and reducing the resistance.

[0088] The application can obtain the circuit distribution and circuit connection mode of the circuit system by analyzing the circuit characteristics of the circuit system, which provides guarantee for subsequent construction of the bridge circuit, wherein the circuit system is the circuit network corresponding to the exercise bike, and the circuit characteristics are the unique properties of the circuit corresponding to the circuit system.

[0089] As an embodiment of the application, the analysis of the circuit characteristics of the circuit system includes: obtaining the circuit topology graph corresponding to the circuit system, identifying the circuit components in the circuit topology graph, extracting the electrical characteristic parameters corresponding to the circuit components, constructing the circuit equation of the circuit system according to the electrical characteristic parameters and the circuit topology graph, calculating the equation value corresponding to the circuit equation, obtaining the characteristic value in the circuit system according to the equation value, and analyzing the circuit characteristics corresponding to the circuit system according to the characteristic value.

[0090] Wherein, the circuit topology graph is the circuit structure diagram corresponding to the circuit system, the circuit component is the electronic element in the circuit topology graph, the electrical characteristic parameter is the resistance, capacitance, and inductance parameter corresponding to the circuit component, the circuit equation is the equation describing the relationship between the current, voltage, and resistance in the circuit in the circuit system, the equation value is the numerical value obtained after solving the circuit equation, and the characteristic value is the characteristic parameter value in the circuit system.

[0091] Optionally, the circuit components in the circuit topology diagram can be realized by a circuit component identification tool compiled by Java language, the electrical characteristic parameters corresponding to the circuit components can be extracted by a device circuit model VBIC, the circuit equation of the circuit system can be constructed by combining the electrical characteristic parameters and the circuit topology diagram according to circuit theorems such as Ohm's law, and the equation value corresponding to the circuit equation can be calculated by an algebraic method, and the circuit characteristics can be analyzed according to the characteristic value to analyze the stability, amplification factor and frequency response of the circuit system.

[0092] According to the circuit characteristics, a bridge circuit is constructed in the circuit system, so that the sensitivity of the circuit system can be improved, the electromagnetic iron can be better pushed, and the problem of back electromotive force can be effectively eliminated, wherein the bridge circuit is a circuit composed of four resistors or other sensor elements, which is usually divided into two equal resistor (or sensor) pairs and an excitation voltage or excitation current.

[0093] S4, if the resistance adjustment direction is to increase the resistance, the increased magnetic field strength of the electromagnet is calculated according to the adjusted resistance value, the circuit control scheme of the bridge circuit is formulated combined with the current magnetic field strength and the increased magnetic field strength, and the first control scheme is obtained.

[0094] It should be understood that if the resistance adjustment direction is to increase the resistance, the increased magnetic field strength of the electromagnet is calculated according to the adjusted resistance value, and the adjusted magnetic field strength required by the electromagnet to reach the adjusted resistance value is obtained, so that the circuit control scheme of the bridge circuit can be formulated subsequently, and the resistance of the exercise bike can be better adjusted, wherein the increased magnetic field strength is the magnetic field strength required by the electromagnet to reach the adjusted resistance value.

[0095] As an embodiment of the present application, the increased magnetic field strength of the electromagnet is calculated according to the adjusted resistance value, which comprises:

[0096] The increased magnetic field strength of the electromagnet is calculated by the following formula:

[0097]

[0098] Wherein, H represents the increased magnetic field strength of the electromagnet, μ0 represents the magnetic permeability of the electromagnet in vacuum, G represents the number of turns of the electromagnet coil, M a represents the adjusted resistance value, L represents the total length of the coil, and R represents the resistance value corresponding to the coil.

[0099] The application can improve the resistance adjustment accuracy of the exercise bicycle by combining the current magnetic field intensity and the increased magnetic field intensity to formulate the circuit control scheme of the bridge circuit, and can determine the circuit connection mode, current size and resistance size of the bridge circuit by combining the current magnetic field intensity and the increased magnetic field intensity to formulate the circuit control scheme of the bridge circuit.

[0100] S5, if the resistance adjustment direction is to reduce the resistance, the reduced magnetic field intensity of the electromagnet is calculated according to the adjusted resistance value, the circuit control scheme of the bridge circuit is formulated by combining the current magnetic field intensity and the reduced magnetic field intensity, and a second control scheme is obtained.

[0101] It should be understood that if the resistance adjustment direction is to reduce the resistance, the application calculates the reduced magnetic field intensity of the electromagnet according to the adjusted resistance value, and then obtains the reduced magnetic field intensity required by the electromagnet to reach the adjusted resistance value. Optionally, the calculation principle of the reduced magnetic field intensity is the same as that of the increased magnetic field intensity, which will not be described in detail here.

[0102] S6, the resistance control of the exercise bicycle is performed according to the first control scheme and the second control scheme, and the MOS tube temperature on the exercise bicycle is measured in real time, and the resistance control result is obtained according to the MOS tube temperature.

[0103] The application can improve the resistance adjustment accuracy of the exercise bicycle by combining the current magnetic field intensity and the increased magnetic field intensity to formulate the circuit control scheme of the bridge circuit, and can determine the circuit connection mode, current size and resistance size of the bridge circuit by combining the current magnetic field intensity and the increased magnetic field intensity to formulate the circuit control scheme of the bridge circuit.

[0104] The application can understand the signal information contained in the resistance adjustment instruction by receiving the resistance adjustment instruction of the exercise bicycle and performing signal analysis on the resistance adjustment instruction, so as to facilitate subsequent determination of the adjustment resistance value of the exercise bicycle through the signal information. The application can better understand the performance parameters corresponding to the electromagnet by collecting the current characteristic parameters corresponding to the electromagnet, so as to facilitate subsequent calculation of the current magnetic field intensity corresponding to the electromagnet. The application can improve the sensitivity of the circuit system by constructing a bridge circuit in the circuit system according to the circuit characteristics, so as to better realize the pushing of the electromagnet and effectively eliminate the problem of counter electromotive force. It should be understood that if the resistance adjustment direction is to increase the resistance, the application calculates the increased magnetic field intensity of the electromagnet according to the adjustment resistance value, and then obtains the adjusted magnetic field intensity required by the electromagnet to reach the adjustment resistance value, so as to facilitate subsequent formulation of the circuit control scheme of the bridge circuit and better adjustment of the resistance of the exercise bicycle. The application can improve the accuracy of resistance control of the exercise bicycle by executing resistance control of the exercise bicycle according to the first control scheme and the second control scheme and by measuring the MOS tube temperature on the exercise bicycle in real time to understand the elimination of counter electromotive force during resistance control. Therefore, the electromagnet resistance control method of the exercise bicycle provided in the embodiment of the application can improve the accuracy of electromagnet resistance control of the exercise bicycle.

[0105] As Figure 2 shown is a functional module diagram of an electromagnet resistance control device of an exercise bicycle provided in an embodiment of the application.

[0106] The electromagnet resistance control device 100 of the exercise bicycle can be installed in an electronic device. According to the functions to be implemented, the electromagnet resistance control device 100 of the exercise bicycle can include a resistance value calculation module 101, a magnetic field intensity calculation module 102, a circuit construction module 103, a first scheme formulation module 104, a second scheme formulation module 105, and a resistance control execution module 106. The modules of the application can also be referred to as units, which refer to a series of computer program segments that can be executed by an electronic device processor and can complete fixed functions, and are stored in the memory of the electronic device.

[0107] In this embodiment, the functions of each module / unit are as follows:

[0108] The resistance value calculation module 101 is configured to receive a resistance adjustment instruction of an exercise bicycle, perform signal analysis on the resistance adjustment instruction, obtain an instruction signal, and determine an adjustment resistance value of the exercise bicycle according to the instruction signal.

[0109] The magnetic field strength calculation module 102 is configured to collect a current characteristic parameter corresponding to an electromagnet of the exercise bicycle, query a current resistance value of the exercise bicycle, and calculate a current magnetic field strength corresponding to the electromagnet in combination with the current resistance value and the current characteristic parameter.

[0110] The circuit construction module 103 is configured to obtain a circuit system of the exercise bicycle, analyze a circuit characteristic of the circuit system, construct a bridge circuit in the circuit system according to the circuit characteristic, and determine a resistance adjustment direction of the electromagnet, the resistance adjustment direction including increasing resistance and reducing resistance.

[0111] The first scheme formulation module 104 is configured to, if the resistance adjustment direction is increasing resistance, calculate an increased magnetic field strength of the electromagnet according to the adjusted resistance value, formulate a circuit control scheme of the bridge circuit in combination with the current magnetic field strength and the increased magnetic field strength, and obtain a first control scheme.

[0112] The second scheme formulation module 105 is configured to, if the resistance adjustment direction is reducing resistance, calculate a reduced magnetic field strength of the electromagnet according to the adjusted resistance value, formulate a circuit control scheme of the bridge circuit in combination with the current magnetic field strength and the reduced magnetic field strength, and obtain a second control scheme.

[0113] The resistance control execution module 106 is configured to execute resistance control on the exercise bicycle according to the first control scheme and the second control scheme, and measure a MOS tube temperature on the exercise bicycle in real time, and obtain a resistance control result according to the MOS tube temperature.

[0114] In detail, each module in the electromagnet resistance control device 100 of the exercise bicycle in the embodiment of the present application uses the same technical means as the electromagnet resistance control method of the exercise bicycle in the above Figure 1 , and can produce the same technical effects, which will not be described here.

[0115] As shown in Figure 3 , it is a structural schematic diagram of an electronic device 1 for implementing an electromagnet resistance control method of an exercise bicycle according to an embodiment of the present application.

[0116] The electronic device 1 can include a processor 10, a memory 11, a communication bus 12, and a communication interface 13, and can further include a computer program stored in the memory 11 and executable on the processor 10, such as an electromagnet resistance control method program of an exercise bicycle.

[0117] The processor 10 may, in some embodiments, be composed of integrated circuits, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits of the same or different functions, including one or more combinations of central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. The processor 10 is the control unit of the electronic device 1, and is connected to various components of the electronic device through various interfaces and lines, and executes programs or modules stored in the memory 11 (for example, a program of an electromagnetic resistance control method of a fitness bike), and calls data stored in the memory 11, to perform various functions and process data of the electronic device.

[0118] The memory 11 includes at least one type of readable storage medium, including a flash memory, a mobile hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 11 may, in some embodiments, be an internal storage unit of the electronic device, for example, a mobile hard disk of the electronic device. The memory 11 may, in other embodiments, also be an external storage device of the electronic device, for example, a plug-in mobile hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, and the like. Further, the memory 11 may include both an internal storage unit and an external storage device of the electronic device. The memory 11 can be used to store application software and various data installed in the electronic device, for example, a code of a program of an electromagnetic resistance control method of a fitness bike, and can also be used to temporarily store data that has been output or will be output.

[0119] The communication bus 12 can be a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, or the like. The bus can be divided into an address bus, a data bus, a control bus, and the like. The bus is configured to enable connection and communication between the memory 11, the processor 10, and the like.

[0120] The communication interface 13 is used for communication between the electronic device 1 and other devices, including a network interface and a user interface. Optionally, the network interface can include a wired interface and / or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is usually used to establish a communication connection between the electronic device and other electronic devices. The user interface can be a display (Display), an input unit (such as a keyboard (Keyboard)), and optionally, the user interface can also be a standard wired interface, a wireless interface. Optionally, in some embodiments, the display can be an LED display, a liquid crystal display, a touch liquid crystal display, and an OLED (Organic Light-Emitting Diode) touch screen, etc. Among them, the display can also be appropriately called a display screen or a display unit, which is used to display information processed in the electronic device and to display a visual user interface.

[0121] Figure 3 Only the electronic device with components is shown, and those skilled in the art can understand that, Figure 3 The structure shown does not constitute a limitation on the electronic device 1, and can include fewer or more components than shown, or combine certain components, or different component arrangements.

[0122] For example, although not shown, the electronic device 1 can also include a power source (such as a battery) for powering each component. Preferably, the power source can be logically connected to the at least one processor 10 through a power management system, so that functions such as charge management, discharge management, and power consumption management can be realized through the power management system. The power source can also include one or more direct current or alternating current power sources, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and any other components. The electronic device 1 can also include various sensors, Bluetooth modules, Wi-Fi modules, etc., which are not described here.

[0123] It should be understood that the embodiments are only for illustration and are not limited in the scope of the patent application by this structure.

[0124] The program stored in the memory 11 of the electronic device 1 for the electromagnetic resistance control method of an exercise bike is a combination of multiple instructions, which, when executed in the processor 10, can achieve:

[0125] Receiving a resistance adjustment instruction of the exercise bike, signal analyzing the resistance adjustment instruction to obtain an instruction signal, and determining an adjustment resistance value of the exercise bike according to the instruction signal;

[0126] Collecting a current characteristic parameter corresponding to an electromagnet of the exercise bicycle, and querying a current resistance value of the exercise bicycle, combining the current resistance value and the current characteristic parameter, calculating a current magnetic field intensity corresponding to the electromagnet;

[0127] Obtaining a circuit system of the exercise bicycle, analyzing a circuit characteristic of the circuit system, constructing a bridge circuit in the circuit system according to the circuit characteristic, and judging a resistance adjustment direction of the electromagnet, the resistance adjustment direction including: increasing resistance and reducing resistance;

[0128] If the resistance adjustment direction is to increase resistance, then according to the adjustment resistance value, the increasing magnetic field intensity of the electromagnet is calculated, combining the current magnetic field intensity and the increasing magnetic field intensity, the circuit control scheme of the bridge circuit is formulated, and a first control scheme is obtained;

[0129] If the resistance adjustment direction is to reduce resistance, then according to the adjustment resistance value, the reducing magnetic field intensity of the electromagnet is calculated, combining the current magnetic field intensity and the reducing magnetic field intensity, the circuit control scheme of the bridge circuit is formulated, and a second control scheme is obtained;

[0130] According to the first control scheme and the second control scheme, the resistance control of the exercise bicycle is executed, and the MOS tube temperature on the exercise bicycle is measured in real time, and according to the MOS tube temperature, a resistance control result is obtained.

[0131] Specifically, the specific implementation method of the processor 10 to the above instructions can refer to the description of the related steps in the corresponding embodiment of the drawings, which will not be described here.

[0132] Further, the modules / units integrated in the electronic device 1, if realized in the form of software function units and sold or used as independent products, can be stored in a computer readable storage medium. The computer readable storage medium can be volatile or non-volatile. For example, the computer readable medium can include any entity or system capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory).

[0133] The application also provides a computer readable storage medium, the readable storage medium stores a computer program, when the computer program is executed by the processor of the electronic device, the computer program can realize:

[0134] Receiving a resistance adjustment instruction of the exercise bicycle, signal analyzing the resistance adjustment instruction to obtain an instruction signal, and determining an adjustment resistance value of the exercise bicycle according to the instruction signal;

[0135] Collecting a current characteristic parameter corresponding to an electromagnet of the exercise bicycle, and querying a current resistance value of the exercise bicycle, combining the current resistance value and the current characteristic parameter, calculating a current magnetic field intensity corresponding to the electromagnet;

[0136] Obtaining a circuit system of the exercise bicycle, analyzing a circuit characteristic of the circuit system, constructing a bridge circuit in the circuit system according to the circuit characteristic, and judging a resistance adjustment direction of the electromagnet, the resistance adjustment direction including: increasing resistance and reducing resistance;

[0137] If the resistance adjustment direction is increasing resistance, calculating an increased magnetic field intensity of the electromagnet according to the adjusted resistance value, combining the current magnetic field intensity and the increased magnetic field intensity, formulating a circuit control scheme of the bridge circuit, and obtaining a first control scheme;

[0138] If the resistance adjustment direction is reducing resistance, calculating a reduced magnetic field intensity of the electromagnet according to the adjusted resistance value, combining the current magnetic field intensity and the reduced magnetic field intensity, formulating a circuit control scheme of the bridge circuit, and obtaining a second control scheme;

[0139] According to the first control scheme and the second control scheme, performing resistance control on the exercise bicycle, and measuring a MOS tube temperature on the exercise bicycle in real time, and obtaining a resistance control result according to the MOS tube temperature.

[0140] In several embodiments provided in the present application, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. For example, the above-described system embodiments are only illustrative, for example, the division of the modules is only a logical function division, and actual implementation can have another division mode.

[0141] The modules described as separate components can or can not be physically separated, and the components displayed as modules can or can not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. According to actual needs, part or all of the modules can be selected to achieve the purpose of the embodiment scheme.

[0142] In addition, the functional modules in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware, or in the form of hardware plus software function modules.

[0143] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments but can be implemented in other embodiments without departing from the scope of the application.

[0144] The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description given above, so that all changes coming within the meaning and equivalency range of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the scope of the claims.

[0145] Embodiments of the present application can acquire and process related data based on artificial intelligence technology. Wherein, artificial intelligence (AI) is to use digital computers or digital computer controlled machines to simulate, extend and expand human intelligence, perceive the environment, obtain knowledge and use knowledge to obtain the best results.

[0146] In addition, it is clear that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. The plurality of units or systems stated in the system claims can also be implemented by one unit or system through software or hardware. The words first, second, etc. are used to indicate names and not to indicate any particular order.

[0147] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application rather than limit the present application, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A method for controlling the electromagnet resistance of an exercise bike, characterized in that, The method includes: The system receives a resistance adjustment command from the exercise bike, performs signal analysis on the resistance adjustment command to obtain a command signal, and determines the adjustable resistance value of the exercise bike based on the command signal. The current characteristic parameters corresponding to the electromagnet of the exercise bike are collected, and the current resistance value of the exercise bike is queried. Combining the current resistance value and the current characteristic parameters, the current magnetic field strength corresponding to the electromagnet is calculated. The collection of the current characteristic parameters corresponding to the electromagnet of the exercise bike includes: Obtain the parameter index of the electromagnet of the exercise bike and the corresponding resistance adjustment mechanism of the electromagnet, and analyze the resistance adjustment index of the electromagnet based on the resistance adjustment mechanism. Calculate the correlation coefficient between the aforementioned resistance adjustment indices: The correlation coefficient between the resistance adjustment indicators is calculated using the following formula: Where D represents the correlation coefficient between resistance adjustment indicators, i and i+1 represent the sequence numbers of the resistance adjustment indicators, μ represents the number of resistance adjustment indicators, and A i Let lnA represent the vector value corresponding to the i-th indicator in the resistance adjustment index. i A represents the logarithmic value corresponding to the vector value of the i-th indicator in the resistance adjustment index. i+1 Let lnA represent the vector value corresponding to the (i+1)th indicator in the resistance adjustment index. i+1 α represents the logarithmic value of the vector value corresponding to the (i+1)th indicator in the resistance adjustment index, where α represents the vector dimension. Based on the correlation coefficient, determine the linear index corresponding to the electromagnet adjustment resistance; Based on the linear index, the parameter indexes are filtered to obtain the target parameter index, and the parameters corresponding to the target parameter index are extracted to obtain the current index parameters; Calculate the weight coefficient corresponding to each parameter in the current indicator parameters, and extract the current feature parameters in the indicator parameters based on the weight coefficients; The current characteristic parameters include magnet current parameters, magnet coil parameters, and magnet cross-sectional area parameters; Calculate the current magnetic flux of the electromagnet based on the magnet current parameters and the magnet coil parameters: The current magnetic flux of the electromagnet is calculated using the following formula: E=β1*I1+β2*I2…+β r *I r Where E represents the current magnetic flux of the electromagnet, and β1, β2, β... r These represent the first, second, and r-th magnet coils in the magnet coil parameters, where r represents the total number of magnet coils. I1 represents the current value passing through the first magnet coil in the magnet current parameters, and I2 represents the current value passing through the second magnet coil in the magnet current parameters. r This represents the current value passing through the r-th magnet coil in the magnet current parameters, β1*I1 represents the magnetic flux corresponding to the first magnet coil, β2*I2 represents the magnetic flux corresponding to the second magnet coil, and β... r *I r This represents the magnetic flux corresponding to the r-th magnet coil; Calculate the current magnetic field strength of the electromagnet based on the current magnetic flux and the cross-sectional parameters of the magnet; Obtain the circuit system of the exercise bike, analyze the circuit characteristics of the circuit system, construct a bridge circuit in the circuit system based on the circuit characteristics, and determine the resistance adjustment direction of the electromagnet, wherein the resistance adjustment direction includes: increasing resistance and decreasing resistance. If the resistance adjustment direction is to increase the resistance, then based on the adjusted resistance value, the increased magnetic field strength of the electromagnet is calculated. Combining the current magnetic field strength and the increased magnetic field strength, a circuit control scheme for the bridge circuit is formulated to obtain a first control scheme. The step of calculating the increased magnetic field strength of the electromagnet based on the adjusted resistance value includes: The increased magnetic field strength of the electromagnet is calculated using the following formula: Where H represents the increased magnetic field strength of the electromagnet, μ0 represents the permeability of the electromagnet in vacuum, G represents the number of turns of the electromagnet's coil, and M... a This indicates the adjustment resistance value, where L represents the total length of the coil and R represents the corresponding resistance value of the coil. If the resistance adjustment direction is to reduce resistance, then the reduced magnetic field strength of the electromagnet is calculated based on the adjusted resistance value. Combining the current magnetic field strength and the reduced magnetic field strength, a circuit control scheme for the bridge circuit is formulated to obtain the second control scheme. According to the first control scheme and the second control scheme, resistance control of the exercise bike is performed, and the temperature of the MOSFET on the exercise bike is measured in real time. The resistance control result is obtained based on the temperature of the MOSFET.

2. The method for controlling the electromagnet resistance of an exercise bike as described in claim 1, characterized in that, The step of parsing the resistance adjustment command to obtain the command signal includes: Obtain the command electrical signal corresponding to the resistance adjustment command, and perform noise reduction processing on the command electrical signal to obtain a noise-reduced command electrical signal; The noise reduction command signal is quantized to obtain a quantized command signal; The quantized command electrical signal is encoded to obtain an encoded command electrical signal; Feature extraction is performed on the encoded instruction electrical signal to obtain signal features; Based on the signal characteristics, the encoded instruction electrical signal is output to obtain the instruction signal.

3. The method for controlling the electromagnet resistance of an exercise bike as described in claim 2, characterized in that, The step of extracting features from the encoded instruction electrical signal to obtain signal features includes: The encoded instruction electrical signal is subjected to signal framing processing to obtain a framed electrical signal; Calculate the signal value corresponding to the framed electrical signal, and calculate the feature value of the encoded instruction electrical signal based on the signal value; Based on the feature values, feature extraction is performed on the encoded instruction electrical signal to obtain signal features.

4. The method for controlling the electromagnet resistance of an exercise bike as described in claim 1, characterized in that, The analysis of the circuit characteristics of the circuit system includes: Obtain the circuit topology diagram corresponding to the circuit system, and identify the circuit components in the circuit topology diagram; Extract the electrical characteristic parameters corresponding to the circuit components, and construct the circuit equations of the circuit system based on the electrical characteristic parameters and the circuit topology diagram; Calculate the equation value corresponding to the circuit equation, and obtain the characteristic value of the circuit system based on the equation value; Based on the aforementioned characteristic values, analyze the circuit characteristics corresponding to the circuit system.

5. An electromagnet resistance control device for an exercise bike, characterized in that, The device includes: The resistance value calculation module is used to receive the resistance adjustment command from the exercise bike, analyze the resistance adjustment command to obtain the command signal, and determine the adjustable resistance value of the exercise bike based on the command signal. The magnetic field strength calculation module is used to collect the current characteristic parameters corresponding to the electromagnet of the exercise bike, query the current resistance value of the exercise bike, and calculate the current magnetic field strength corresponding to the electromagnet by combining the current resistance value and the current characteristic parameters. The collection of the current characteristic parameters corresponding to the electromagnet of the exercise bike includes: Obtain the parameter index of the electromagnet of the exercise bike and the corresponding resistance adjustment mechanism of the electromagnet, and analyze the resistance adjustment index of the electromagnet based on the resistance adjustment mechanism. Calculate the correlation coefficient between the aforementioned resistance adjustment indices: The correlation coefficient between the resistance adjustment indicators is calculated using the following formula: Where D represents the correlation coefficient between resistance adjustment indicators, i and i+1 represent the sequence numbers of the resistance adjustment indicators, μ represents the number of resistance adjustment indicators, and A i Let lnA represent the vector value corresponding to the i-th indicator in the resistance adjustment index. i A represents the logarithmic value corresponding to the vector value of the i-th indicator in the resistance adjustment index. i+1 Let lnA represent the vector value corresponding to the (i+1)th indicator in the resistance adjustment index. i+1 α represents the logarithmic value of the vector value corresponding to the (i+1)th indicator in the resistance adjustment index, where α represents the vector dimension. Based on the correlation coefficient, determine the linear index corresponding to the electromagnet adjustment resistance; Based on the linear index, the parameter indexes are filtered to obtain the target parameter index, and the parameters corresponding to the target parameter index are extracted to obtain the current index parameters; Calculate the weight coefficient corresponding to each parameter in the current indicator parameters, and extract the current feature parameters in the indicator parameters based on the weight coefficients; The current characteristic parameters include magnet current parameters, magnet coil parameters, and magnet cross-sectional area parameters; Calculate the current magnetic flux of the electromagnet based on the magnet current parameters and the magnet coil parameters: The current magnetic flux of the electromagnet is calculated using the following formula: E=β1*I1+β2*I2…+β r *I r Where E represents the current magnetic flux of the electromagnet, and β1, β2, β... r These represent the first, second, and r-th magnet coils in the magnet coil parameters, where r represents the total number of magnet coils. I1 represents the current value passing through the first magnet coil in the magnet current parameters, and I2 represents the current value passing through the second magnet coil in the magnet current parameters. r This represents the current value passing through the r-th magnet coil in the magnet current parameters, β1*I1 represents the magnetic flux corresponding to the first magnet coil, β2*I2 represents the magnetic flux corresponding to the second magnet coil, and β... r *I r This represents the magnetic flux corresponding to the r-th magnet coil; Calculate the current magnetic field strength of the electromagnet based on the current magnetic flux and the cross-sectional parameters of the magnet; The circuit construction module is used to acquire the circuit system of the exercise bike, analyze the circuit characteristics of the circuit system, construct a bridge circuit in the circuit system based on the circuit characteristics, and determine the resistance adjustment direction of the electromagnet, wherein the resistance adjustment direction includes: increasing resistance and decreasing resistance. The first scheme formulation module is used to, if the resistance adjustment direction is to increase the resistance, calculate the increased magnetic field strength of the electromagnet based on the adjusted resistance value, and formulate a circuit control scheme for the bridge circuit by combining the current magnetic field strength and the increased magnetic field strength, thereby obtaining a first control scheme. The step of calculating the increased magnetic field strength of the electromagnet based on the adjusted resistance value includes: The increased magnetic field strength of the electromagnet is calculated using the following formula: Where H represents the increased magnetic field strength of the electromagnet, μ0 represents the permeability of the electromagnet in vacuum, G represents the number of turns of the electromagnet's coil, and M... a This indicates the adjustment resistance value, where L represents the total length of the coil and R represents the corresponding resistance value of the coil. The second scheme formulation module is used to calculate the reduced magnetic field strength of the electromagnet based on the adjusted resistance value if the resistance adjustment direction is to reduce the resistance, and formulate the circuit control scheme of the bridge circuit by combining the current magnetic field strength and the reduced magnetic field strength to obtain the second control scheme. The resistance control execution module is used to perform resistance control on the exercise bike according to the first control scheme and the second control scheme, and to measure the temperature of the MOSFET on the exercise bike in real time, and to obtain the resistance control result based on the temperature of the MOSFET.

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