CN106787250B - Electric power-assisted bicycle pedal force signal detection and modulation circuit and method - Google Patents
Electric power-assisted bicycle pedal force signal detection and modulation circuit and method Download PDFInfo
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- CN106787250B CN106787250B CN201710104516.4A CN201710104516A CN106787250B CN 106787250 B CN106787250 B CN 106787250B CN 201710104516 A CN201710104516 A CN 201710104516A CN 106787250 B CN106787250 B CN 106787250B
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 14
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
- B62M6/40—Rider propelled cycles with auxiliary electric motor
- B62M6/45—Control or actuating devices therefor
- B62M6/50—Control or actuating devices therefor characterised by detectors or sensors, or arrangement thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses a pedal force signal detection and modulation circuit and method for an electric power-assisted bicycle, which are used for detecting external signals to be transmitted to a control system or transmitting command signals sent by the control system to an execution part, and comprise the following steps: a speed/direction sensor module for collecting speed and direction signals; a speed detecting section for detecting speed data; the rotating circuit module is used for collecting external signals; a stationary circuit module coupled to the rotating circuit module for providing electrical power to the rotating circuit; the two circuits are completely isolated, and meanwhile, wireless power supply is realized, so that when the pedal shaft of the electric booster bicycle rotates, no contact and friction exist; the two circuits realize energy transmission and multipath signal transmission through the coupling, modulation and detection loops of the two coils.
Description
Technical Field
The invention relates to a circuit design technology, in particular to a pedal force signal detection and modulation circuit and method for an electric power-assisted bicycle.
Background
The traditional electric power-assisted bicycle signal acquisition module is powered by a wired power supply mode and used for signal transmission, so that a connecting wire of the electric power-assisted bicycle is complicated, hidden is not facilitated, the defects of unreliable contact and easy damage are easily caused, and the light and small development of the electric power-assisted bicycle is not facilitated. In addition, in the contact power supply mode, contact and friction exist when the pedal shaft rotates to work.
Disclosure of Invention
The invention aims to: in order to solve the defects in the prior art, the pedal force signal detection modulation circuit and method for the electric power-assisted bicycle are provided, wherein the pedal force signal detection modulation circuit can wirelessly supply power, meanwhile, multipath data is transmitted by utilizing a power supply signal, and different signals are identified by utilizing the modulation pulse width height, the pulse width and the pulse width frequency.
The technical scheme is as follows: a pedal force signal detection and modulation circuit for an electric power assisted bicycle for detecting an external signal transmitted to a control system or transmitting a command signal transmitted from the control system to an execution part, the circuit comprising: a speed/direction sensor module for collecting speed and direction signals; a speed detecting section for detecting speed data; the rotating circuit module is used for collecting external signals; and the static circuit module is coupled with the rotating circuit module and can provide electric energy for the rotating circuit.
Furthermore, the stationary circuit module and the rotary circuit module can also mutually transmit multiple signals.
In addition, the stationary circuit module includes: a DC power supply for supplying DC power to each loop of the stationary circuit module; a clock signal generating circuit powered by the DC power supply, the output end of which is connected with the input end of a power amplifying circuit; the power amplification loop is powered by a direct-current power supply, the output end of the power amplification loop is connected with an induction coil L1, the other end of the induction coil L1 is connected with the positive electrode of a capacitor C1, and the negative electrode of the capacitor C1 is grounded; the signal detection loop is powered by a direct current power supply, the input end of the signal detection loop is connected to the contact point of the induction coil L1 and the capacitor C1, and the output end of the signal detection loop is connected with the input end of a low-pass filter loop; the low-pass filter circuit is powered by a direct-current power supply, and the output end of the low-pass filter circuit is connected with the input end of a signal shaping amplifying circuit; and the signal shaping and amplifying circuit is powered by a direct current power supply, and the output end of the signal shaping and amplifying circuit is connected with the MCU.
Furthermore, the power amplification circuit includes a triode, and the signal detection circuit includes a diode.
In addition, the rotation circuit module includes: an induction coil L3 coupled with the induction coil L1; a power resonant circuit connected in parallel with the induction coil L3 for maximizing electromagnetic wave energy transmitted from the induction coil L2 received by the induction coil L3; the output end of the unidirectional loop is connected with the input end of a filtering loop, the output end of the filtering loop is connected with a voltage stabilizing loop, and the voltage stabilizing loop provides power supply voltage for the strain signal acquisition loop, the strain signal amplification loop and the voltage-to-frequency loop; the strain signal acquisition circuit acquires external signals, the output end of the strain signal acquisition circuit is connected with the input end of the strain signal amplification circuit, the output end of the strain signal amplification circuit is connected with the input end of the voltage-to-frequency circuit, the output end of the voltage-to-frequency circuit is connected with the input end of the signal modulation output circuit, the other end of the signal modulation output circuit is connected with the load resistor R1, and the other end of the load resistor R1 is connected with the junction of the rectifying circuit and the unidirectional circuit.
The rectification circuit is a single-phase half-wave rectification circuit; the signal modulation output loop comprises a triode T1, the output end of the voltage-to-frequency loop is connected with the base electrode of the triode T1 through a resistor R2, the collector electrode of the triode T1 is connected with a load resistor R1, and the emitter electrode of the triode T1 is grounded;
in addition, the external signal is a weak change of the resistance strain sensor caused by a moment change of the rotation shaft; the strain signal acquisition loop acquires weak changes of the resistance strain sensor and outputs a first strain signal; the strain signal amplifying circuit amplifies the first strain signal according to a set proportion and outputs a second strain signal; the voltage-to-frequency loop converts the second strain signal into a square wave signal which is in linear proportion with the second strain signal according to a set proportion and outputs the square wave signal; the square wave signal controls the conduction of a resistor R1 through the switching action of a triode T1, and pulls down the output voltage of the rectification loop to cause load emphasis; the load aggravates the current change that causes rectification return circuit, power resonant circuit and induction coil L3 for produce the coupling current in the induction coil L1, and then arouse the change of DC power supply's power supply through electric capacity C1 and power amplifier circuit, realize the transmission of modulation signal.
Moreover, the voltage waveform across the capacitor C1 is modulated into a data envelope form.
In addition, after the data envelope is rectified and detected by the signal detection circuit, weak changes which are completely synchronous with the modulation signals are output through the low-pass filter circuit, and then the weak changes are processed and restored into the modulation signals through the signal shaping and amplifying circuit and are output to the MCU.
In a further embodiment, the following solution is provided: an electric bicycle pedal force signal detection modulation circuit, comprising: a stationary circuit module and a rotating circuit module;
stationary circuit module: the static circuit module comprises a direct-current power supply, a clock signal generation circuit, a power amplification circuit, a signal detection circuit, a low-pass filtering circuit, a signal shaping amplification circuit, a first induction coil L1 and a capacitor C1;
the direct-current power supply is respectively connected with the power ends of the clock signal generation circuit, the power amplification circuit, the signal detection circuit, the low-pass filtering circuit and the signal shaping amplification circuit;
the output end of the clock signal generation loop is connected with the input end of the power amplification loop, the output end of the power amplification loop is connected with one end of the first induction coil L1, the other end of the first induction coil L1 is connected with the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded;
the input end of the signal detection circuit is connected to the contact point of the first induction coil L1 and the capacitor C1, the output end of the signal detection circuit is connected with the input end of the low-pass filter circuit, the output end of the low-pass filter circuit is connected with the input end of the signal shaping and amplifying circuit, and the output end of the signal shaping and amplifying circuit is connected to the MCU;
a rotation circuit module: the rotating circuit module comprises a second induction coil L3, a power resonant circuit, a rectifying circuit, a unidirectional circuit, a filtering circuit, a voltage stabilizing circuit, a strain signal acquisition circuit, a strain signal amplification circuit, a voltage-to-frequency circuit, a signal modulation output circuit, a first resistor R1 and a base resistor; the signal modulation output loop comprises a triode T1;
the second induction coil L3 is connected with the power resonant circuit in parallel, the output end of the power resonant circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the unidirectional circuit, the output end of the unidirectional circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is respectively connected with the strain signal acquisition circuit, the strain signal amplifying circuit and the power end of the voltage-to-frequency circuit;
the output end of the strain signal acquisition loop is connected with the input end of the strain signal amplification loop, the output end of the strain signal amplification loop is connected with the input end of the voltage-to-frequency loop, the output end of the voltage-to-frequency loop is connected with one end of a base resistor, the other end of the base resistor is connected with the base of a triode T1, the emitter of the triode T1 is grounded, the collector of the triode T1 is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with a junction of the rectifying loop and the unidirectional loop;
the first induction coil L1 of the stationary circuit module is coupled with the second induction coil L3 of the rotating circuit module. The triode T1 is an NPN triode.
The signal detection modulation method based on the circuit comprises the steps that the static circuit module provides electric energy for the rotating circuit module through the coupling of the first induction coil L1 and the second induction coil L3;
the clock signal generated by the clock signal generation circuit of the static circuit module is amplified by the power amplification circuit to output a power signal, the amplified power signal passes through the first induction coil L1 and the capacitor C to cause the first induction coil to generate an induction magnetic field, and meanwhile, the capacitor C1 stores electric energy;
the second induction coil L3 of the rotating circuit module rotates in an induction magnetic field generated by the first induction coil L1, induced electromotive force is generated at two ends of the second induction coil L3, induction alternating current is generated, the induction alternating current passes through the power resonant circuit to maximize electric energy, and then the electric energy is input into the rectifying circuit, and the rectifying circuit converts the alternating current into pulse direct current and outputs the pulse direct current;
the pulse direct current output by the rectification loop is input into the filtering loop through the unidirectional loop, the filtering loop filters and stores energy, the filtered direct current is input into the voltage stabilizing loop, and the working power supplies with high stability and low ripple variation output by the voltage stabilizing loop are respectively input into the power supply ends of the strain signal acquisition loop, the strain signal amplification loop, the voltage-to-frequency loop and the signal modulation output loop.
Preferably, the rotary circuit module transmits the modulation signal and the energy signal to the stationary circuit module through the coupling of the second induction coil L3 and the first induction coil L1;
the strain signal acquisition circuit acquires a strain signal and outputs the strain signal to the strain signal amplification circuit, the strain signal amplification circuit amplifies the strain signal according to a preset proportion and outputs the amplified strain signal to the voltage-to-frequency circuit, the voltage-to-frequency circuit converts the amplified strain signal into a square wave signal which is in linear proportion with the strain signal according to the preset proportion and outputs the square wave signal to the base electrode of the triode T1 through the base electrode resistor, and the emitter electrode of the triode T1 is connected with digital ground;
when the high level of the square wave signal is input to the base electrode of the triode T1, the triode T1 is in an off state, and the collector electrode first resistor R1 is not conducted;
when the low level of the square wave signal is input to the base electrode of the triode T1, the triode T1 is conducted, the first resistor R1 of the collector is conducted, the output voltage of the rectifying circuit is lowered, the load is increased, and the currents in the rectifying circuit, the power resonant circuit and the second induction coil L3 are changed, namely a modulation signal is output; the current changed in the second induction coil L3 causes the current in the first induction coil L1 to change, and the voltage at two ends of the capacitor C1 changes, so that the current in the power amplification loop changes, and finally the power supply power of the direct current power supply changes; meanwhile, the variable voltage at two ends of the capacitor C1 is input into a signal detection circuit, the signal detection circuit rectifies and detects the received variable voltage and then outputs the rectified variable voltage to a low-pass filter circuit, the low-pass filter circuit filters a high-frequency part to obtain a signal which is completely synchronous with a modulation signal and outputs the signal to a signal shaping and amplifying circuit, and the signal shaping and amplifying circuit shapes and amplifies the received signal to restore the modulation signal and outputs the modulation signal to a control system MCU.
The beneficial effects are that: the static circuit module and the rotating circuit module are mutually coupled through the two coils to realize complete isolation of the two circuits, and meanwhile, the static circuit module is used for supplying power to the rotating circuit module in a wireless way, so that when the shaft rotates, no contact and friction exist; in addition, the strain signals acquired by the strain signal acquisition loop are subjected to a series of changes, and finally the modulated signals are mutually transmitted in the form of disturbance electric energy by utilizing the coupling between the two coils, so that the transmission of multipath data signals of the static circuit and the rotating circuit is realized; identifying different signals by modulating pulse width height, pulse width and pulse width frequency; moreover, when the energy transmission is realized by utilizing the modulation loop and the detection loop, the communication of the two circuits is realized, in addition, the moment signal, the speed signal and the direction signal on the shaft can be transmitted, and the control system distributes the power of the assistance to the electric power-assisted bicycle according to the actual situation or the set value, so that the stable riding feeling is realized.
Drawings
Fig. 1 is a circuit schematic diagram of the stationary circuit board pcba_a.
Fig. 2 is a circuit schematic diagram of the rotary circuit board pcba_b.
Fig. 3 is a timing diagram of the operation of the stationary circuit and the rotating circuit.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a speed/direction sensor module 1 collects speed signals and direction signals of an electric power-assisted bicycle and transmits the signals to a control system for processing; the static circuit module 2 comprises a direct current power supply which provides stable power supply voltage for a clock signal generation loop, a power amplification loop, a signal detection loop, a low-pass filtering loop and a signal shaping amplification loop; the output end of the clock signal generation loop is connected with the input end of the power amplification loop, the output end of the power amplification loop is connected with the induction coil L1, the other end of the induction coil L1 is connected with the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded; the input end of the signal detection loop is connected with the junction of the induction coil L1 and the capacitor C1, the output end of the signal detection loop is connected with the input end of the low-pass filter loop, the output end of the low-pass filter loop is connected with the input end of the signal shaping amplifying loop, and the output end of the signal shaping amplifying loop is connected with the control system MCU.
The power amplifying circuit is a single-tube co-emission amplifying circuit, and in the circuit, an NPN triode plays an amplifying role and is a core component of the power amplifying circuit; the direct current power supply provides direct current for the collector electrode to provide energy for the input signal, and the triode mainly converts the current change into voltage change and then transmits the voltage change to the output end of the amplifying circuit; the respective parameter values are preset as needed to set the magnification.
The signal detection circuit comprises a detection diode, wherein in the detection circuit, an amplitude modulation signal is added to the positive electrode of the detection diode, the detection diode is conducted by utilizing the amplitude of the signal, the diode is conducted by a positive half-cycle signal, and the diode is cut off by a negative half-cycle signal; i.e. the detector diode removes the lower half of the frequency modulated signal, leaving the high frequency carrier signal of the upper half of the upper envelope signal.
The low-pass filter loop is an RC active low-pass filter, which filters the signal higher than the cut-off frequency and outputs the signal lower than the cut-off frequency; that is, after the signal passes through the low-pass filter loop, the signal lower than a certain specific frequency passes through, and the signal quantity which does not meet the requirement is filtered, so that the effect of filtering noise is achieved. The cut-off frequency can be preset by setting the respective parameter values of the RC filter according to different needs.
The signal shaping amplifying circuit comprises an operational amplifier which is a core component of the signal shaping amplifying circuit and can amplify the input signal with small change by a high multiple and output the needed signal waveform.
As shown in fig. 2, the rotating circuit module 3 includes an induction coil L3, a power resonant circuit connected in parallel with the induction coil L3, an output end of the power resonant circuit is connected with an input end of a rectifying circuit, an output end of the rectifying circuit is connected with an input end of a unidirectional circuit, an output end of the unidirectional circuit is connected with an input end of a filtering circuit, an output end of the filtering circuit is connected with an input end of a voltage stabilizing circuit, and the voltage stabilizing circuit provides stable voltage for a strain signal acquisition circuit, a strain signal amplifying circuit and a voltage-to-frequency circuit; the strain signal acquisition loop outputs the acquired signal to the strain signal amplification loop, the output end of the strain signal amplification loop is connected with the input end of the voltage-to-frequency loop, the output end of the voltage-to-frequency loop is connected with the base electrode of the triode T1 through the resistor R2, the collector electrode of the triode T1 is connected with the junction of the rectifying loop and the unidirectional loop through the resistor R1, and the emitter electrode of the triode T1 is connected with the digital ground.
The power resonant tank comprises a capacitor C3, the main function of which is to select the desired frequency.
The rectification circuit can be a single-phase half-wave rectification circuit, and utilizes the unidirectional conduction characteristic of a diode to rectify, namely, the half cycle of the signal is removed, and the other half cycle of the signal is left, so that the alternating current is converted into direct current.
The unidirectional loop comprises a diode, and the unidirectional conduction characteristic of the diode is utilized to realize the stability of the power supply of a subsequent circuit.
The strain signal acquisition loop comprises a strain sensor and is used for acquiring the change of a torsion sleeve on a pedal shaft of the electric power-assisted bicycle and converting the change into an electric signal to be output.
The strain signal amplifying circuit amplifies the received signal to a set multiple.
The voltage-to-frequency loop converts the received voltage signal into a frequency square wave signal and outputs the frequency square wave signal.
Working principle:
1. the clock signal generating circuit generates clock signals, and the output power is amplified by the power amplifying circuit and then energy is sent outwards through L1 and C1.
L3 receives the electromagnetic wave sent by L2 and maximizes the received energy by the power resonant tank capacitor C3.
3. The rectification loop converts the received alternating current into pulse direct current and divides the pulse direct current into 2 paths;
and 3-1, providing electric energy for the strain signal acquisition circuit, the strain signal amplification circuit, the voltage-to-frequency conversion circuit and the signal modulation output circuit after one path passes through the unidirectional circuit, the filtering circuit and the voltage stabilizing circuit.
And 3-2, the other path takes the purpose of pulling down the output voltage of the rectification loop by the load of the rotor part due to the fact that the T1-R1 is not disconnected.
4. The unidirectional loop plays a role in isolating the severe change of the output voltage after the rectification loop caused by the opening of the T1R 1, so that the power supply of a later signal processing part is more stable.
5. The filtering loop plays roles of filtering and energy storage, and the voltage stabilizing loop provides a working power supply with high stability and low ripple variation for the strain signal acquisition loop, the strain signal amplification loop, the voltage-to-frequency loop and the signal modulation output loop
6. The strain signal acquisition circuit transmits the strain signal to the strain signal amplifying circuit for amplifying according to a fixed proportion after the strain signal acquisition circuit acquires the weak change of the strain sensor caused by the torsion sleeve change.
7. The amplified strain signal is converted into square wave with linear proportion to the strain signal through a voltage-to-frequency loop.
8. The converted frequency signal controls the conduction of R1 through the action of a T1 switch, and the purpose of pulling down the output voltage after the rectification loop so as to cause load emphasis is achieved.
9. The load aggravating effect caused by pulling down is transmitted to the power supply direct-current power supply through the rectifying loop-power resonance loop C3-L3-L1-C1-power amplifying loop, so that the power supply power of the direct-current power supply is changed. The change caused by load weighting directly reflects the change of the amplitude of the waveforms sent at the two ends of the stator part current, the power supply and the L1 and the C1; the output waveforms at both ends of L1, C1 produce a data envelope form.
10. And rectifying and detecting the voltage at the two ends of the C1 through a signal detection circuit, and filtering a high-frequency part through a low-pass filter circuit to obtain weak variation which is completely synchronous with the modulation signal.
11. And (3) sending the weak change which is obtained after the filtering treatment and is completely synchronous with the modulation signal to a signal shaping amplifying circuit for processing and restoring to be modulation signal output.
As shown in fig. 3, a timing diagram of the operation of the stationary circuit and the rotating circuit; the modulating signal is a square wave signal, and the waveforms at the two ends of the capacitor C1 are modulated into data envelopes; the data envelope is demodulated into an upper half envelope signal after passing through a signal detection loop; the output waveform of the low-pass filter circuit is a weakly-variable square wave signal which is completely synchronous to the modulation signal; the signal shaping and amplifying circuit outputs a signal wave having the same wave direction as the modulated signal.
When the electric power-assisted bicycle is ridden, the pedal shaft is in a rotating state, a moment (commonly called a torsion sleeve) signal is just on the rotating shaft, a strain sensor in a strain signal acquisition loop is arranged on the shaft, the moment signal on a rotating shaft is acquired, and electric energy is required for detecting the moment signal (torsion sleeve change) on the shaft, so that a transformer-like structure is formed by using two coils and a metal shaft; through the mutual coupling of the two coils, the static circuit module is used for supplying power to the rotating circuit module in a wireless way, and meanwhile, the two circuits are completely isolated; so that there is no contact or friction when the pedal shaft is in rotation.
In addition, the moment signal acquired by the strain signal acquisition loop needs to be transmitted to a control system, and the control system identifies the riding state according to the moment signal, the speed signal and the direction acquired by the speed/direction sensor and transmits a command signal to the pedal shaft; therefore, the signals are modulated by using the coupling between the two coils and then mutually transmitted in the form of disturbance electric energy, and the two coils are provided with opposite detection and decoding circuits, so that the communication of the two circuits is realized while the energy is transmitted.
In another embodiment, a signal detection modulation method is provided, the signal detection method is implemented based on a pedal force signal detection modulation circuit of an electric bicycle, the signal detection circuit includes: a stationary circuit module and a rotating circuit module;
stationary circuit module: the static circuit module comprises a direct-current power supply, a clock signal generation circuit, a power amplification circuit, a signal detection circuit, a low-pass filtering circuit, a signal shaping amplification circuit, a first induction coil L1 and a capacitor C1; the direct-current power supply is respectively connected with the power ends of the clock signal generation circuit, the power amplification circuit, the signal detection circuit, the low-pass filtering circuit and the signal shaping amplification circuit; the output end of the clock signal generation loop is connected with the input end of the power amplification loop, the output end of the power amplification loop is connected with one end of the first induction coil L1, the other end of the first induction coil L1 is connected with the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded; the input end of the signal detection circuit is connected to the contact point of the first induction coil L1 and the capacitor C1, the output end of the signal detection circuit is connected with the input end of the low-pass filter circuit, the output end of the low-pass filter circuit is connected with the input end of the signal shaping and amplifying circuit, and the output end of the signal shaping and amplifying circuit is connected to the MCU;
a rotation circuit module: the rotating circuit module comprises a second induction coil L3, a power resonant circuit, a rectifying circuit, a unidirectional circuit, a filtering circuit, a voltage stabilizing circuit, a strain signal acquisition circuit, a strain signal amplification circuit, a voltage-to-frequency circuit, a signal modulation output circuit, a first resistor R1 and a base resistor; the signal modulation output loop comprises a triode T1; the second induction coil L3 is connected with the power resonant circuit in parallel, the output end of the power resonant circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the unidirectional circuit, the output end of the unidirectional circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is respectively connected with the strain signal acquisition circuit, the strain signal amplifying circuit and the power end of the voltage-to-frequency circuit; the output end of the strain signal acquisition loop is connected with the input end of the strain signal amplification loop, the output end of the strain signal amplification loop is connected with the input end of the voltage-to-frequency loop, the output end of the voltage-to-frequency loop is connected with one end of a base resistor, the other end of the base resistor is connected with the base of a triode T1, the emitter of the triode T1 is grounded, the collector of the triode T1 is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with a junction of the rectifying loop and the unidirectional loop; the first induction coil L1 of the stationary circuit module is coupled with the second induction coil L3 of the rotating circuit module;
the signal detection method comprises the following steps:
the stationary circuit module provides electric energy for the rotating circuit module through the coupling of the first induction coil L1 and the second induction coil L3; the clock signal generated by the clock signal generation circuit of the static circuit module is amplified by the power amplification circuit to output a power signal, the amplified power signal passes through the first induction coil L1 and the capacitor C to cause the first induction coil to generate an induction magnetic field, and meanwhile, the capacitor C1 stores electric energy;
the second induction coil L3 of the rotating circuit module rotates in an induction magnetic field generated by the first induction coil L1, induced electromotive force is generated at two ends of the second induction coil L3, induction alternating current is generated, the induction alternating current passes through the power resonant circuit to maximize electric energy, and then the electric energy is input into the rectifying circuit, and the rectifying circuit converts the alternating current into pulse direct current and outputs the pulse direct current; the pulse direct current output by the rectification circuit is input into the filtering circuit through the unidirectional circuit, the filtering circuit filters and stores energy of the pulse direct current, the filtered direct current is input into the voltage stabilizing circuit, and the working power supplies with high stability and low ripple variation output by the voltage stabilizing circuit are respectively input into the strain signal acquisition circuit, the strain signal amplification circuit, the voltage-to-frequency circuit and the power supply end of the signal modulation output circuit;
the rotary circuit module transmits the modulation signal and the energy signal to the stationary circuit module through the coupling of the second induction coil L3 and the first induction coil L1;
the strain signal acquisition circuit acquires a strain signal and outputs the strain signal to the strain signal amplification circuit, the strain signal amplification circuit amplifies the strain signal according to a preset proportion and outputs the amplified strain signal to the voltage-to-frequency circuit, the voltage-to-frequency circuit converts the amplified strain signal into a square wave signal which is in linear proportion with the strain signal according to the preset proportion and outputs the square wave signal to the base electrode of the triode T1 through the base electrode resistor, and the emitter electrode of the triode T1 is connected with digital ground;
when the high level of the square wave signal is input to the base electrode of the triode T1, the triode T1 is in an off state, and the collector electrode first resistor R1 is not conducted;
when the low level of the square wave signal is input to the base electrode of the triode T1, the triode T1 is conducted, the first resistor R1 of the collector is conducted, the output voltage of the rectifying circuit is lowered, the load is increased, and the currents in the rectifying circuit, the power resonant circuit and the second induction coil L3 are changed, namely a modulation signal is output; the current changed in the second induction coil L3 causes the current in the first induction coil L1 to change, and the voltage at two ends of the capacitor C1 changes, so that the current in the power amplification loop changes, and finally the power supply power of the direct current power supply changes; at the same time, the method comprises the steps of,
the variable voltage at two ends of the capacitor C1 is input into a signal detection circuit, the signal detection circuit rectifies and detects the received variable voltage and then outputs the variable voltage to a low-pass filter circuit, the low-pass filter circuit filters a high-frequency part to obtain a signal which is completely synchronous with a modulation signal and outputs the signal to a signal shaping and amplifying circuit, and the signal shaping and amplifying circuit shapes and amplifies the received signal to restore the modulation signal and outputs the modulation signal to a control system MCU.
The pedal force signal detection and modulation circuit of the electric power-assisted bicycle is mainly applied to torque acquisition of the electric power-assisted bicycle, and is also suitable for non-contact electric energy transmission and multipath signal mutual transmission during all rotations; for example: the torque sensor monitors the temperature of the motor rotor in real time, and rotor parameter setting and the like can be changed through signal transmission.
In a word, compared with the prior art, the original pedal force signal detection and modulation circuit of the electric power-assisted bicycle is divided into two independent circuit modules, a static circuit module and a rotary circuit module, the two circuit modules are mutually coupled through two coils, so that the two circuits are completely isolated, meanwhile, the static circuit module is used for wirelessly supplying power to the rotary circuit module, the circuit power consumption is reduced, the circuit structure is simplified, the pedal force signal detection and modulation circuit is suitable for smaller installation occasions, and when the pedal shaft rotates, the two circuit boards are not contacted and rubbed; in addition, the strain signals acquired by the strain signal acquisition loop are subjected to a series of changes, and finally, the modulated signals are transmitted to the control system in the form of disturbance electric energy by utilizing the coupling between the two coils, so that the transmission of multi-path data signals of the static circuit and the rotating circuit is realized, and different signals are identified by utilizing the modulation pulse width height, the pulse width and the pulse width frequency; furthermore, the strain signal acquisition loop detects the force of the manual pedal, the force is transmitted to the control system through the coupling of the connecting circuit, and the control system distributes the power assisting power to the electric power-assisted bicycle according to the acquired actual signal or the set value, so that stable riding feeling is realized.
Claims (7)
1. A pedal force signal detection and modulation circuit of an electric power-assisted bicycle, which is used for detecting external signals to be transmitted to a control system or transmitting command signals sent by the control system to an execution part, and is characterized in that the circuit comprises:
a speed/direction sensor module for collecting speed and direction signals;
a speed detecting section for detecting speed data;
the rotating circuit module is used for collecting external signals; comprising the following steps:
an induction coil L3 coupled with the induction coil L1;
a power resonant circuit connected in parallel with the induction coil L3 for maximizing electromagnetic wave energy transmitted from the induction coil L1 received by the induction coil L3;
the output end of the unidirectional loop is connected with the input end of a filtering loop, the output end of the filtering loop is connected with a voltage stabilizing loop, and the voltage stabilizing loop provides power supply voltage for the strain signal acquisition loop, the strain signal amplification loop and the voltage-to-frequency loop;
the strain signal acquisition circuit acquires an external signal, the output end of the strain signal acquisition circuit is connected with the input end of the strain signal amplification circuit, the output end of the strain signal amplification circuit is connected with the input end of the voltage-to-frequency circuit, the output end of the voltage-to-frequency circuit is connected with the input end of the signal modulation output circuit, the other end of the signal modulation output circuit is connected with the load resistor R1, and the other end of the load resistor R1 is connected with the junction of the rectifying circuit and the unidirectional circuit;
a stationary circuit module coupled to the rotating circuit module for providing electrical power to the rotating circuit; the stationary circuit module includes:
a DC power supply for supplying DC power to each loop of the stationary circuit module;
a clock signal generating circuit powered by the DC power supply, the output end of which is connected with the input end of a power amplifying circuit;
the power amplification loop is powered by a direct-current power supply, the output end of the power amplification loop is connected with an induction coil L1, the other end of the induction coil L1 is connected with the positive electrode of a capacitor C1, and the negative electrode of the capacitor C1 is grounded;
the signal detection loop is powered by a direct current power supply, the input end of the signal detection loop is connected to the contact point of the induction coil L1 and the capacitor C1, and the output end of the signal detection loop is connected with the input end of a low-pass filter loop;
the low-pass filter circuit is powered by a direct-current power supply, and the output end of the low-pass filter circuit is connected with the input end of a signal shaping amplifying circuit;
the signal shaping amplifying circuit is powered by a direct current power supply, and the output end of the signal shaping amplifying circuit is connected with the MCU;
the stationary circuit module and the rotary circuit module can mutually transmit multipath signals.
2. The circuit of claim 1, wherein the power amplifying circuit comprises a triode and the signal detecting circuit comprises a diode.
3. The circuit for detecting and modulating a pedal force signal of an electric bicycle according to claim 1, wherein the rectifying circuit is a single-phase half-wave rectifying circuit.
4. The circuit for detecting and modulating the pedal force signal of the electric bicycle according to claim 1, wherein the signal modulation output circuit comprises a triode T1, the output end of the voltage-to-frequency circuit is connected with the base electrode of the triode T1 through a resistor R2, the collector electrode of the triode T1 is connected with a load resistor R1, and the emitter electrode of the triode T1 is grounded.
5. The electric bicycle pedal force signal detection and modulation circuit according to claim 1, wherein the external signal is a weak change of the resistance strain sensor caused by a moment change of the rotation shaft;
the strain signal acquisition loop acquires weak changes of the resistance strain sensor and outputs a first strain signal;
the strain signal amplifying circuit amplifies the first strain signal according to a set proportion and outputs a second strain signal;
the voltage-to-frequency loop converts the second strain signal into a square wave signal which is in linear proportion with the second strain signal according to a set proportion and outputs the square wave signal;
the square wave signal controls the conduction of a resistor R1 through the switching action of a triode T1, and pulls down the output voltage of the rectification loop to cause load emphasis;
the load aggravates the current change that causes rectification return circuit, power resonant circuit and induction coil L3 for produce the coupling current in the induction coil L1, and then arouse the change of DC power supply's power supply through electric capacity C1 and power amplifier circuit, realize the transmission of modulation signal.
6. The circuit for detecting and modulating a pedal force signal of an electric bicycle according to claim 5, wherein the voltage waveform across the capacitor C1 is modulated into a data envelope form; and after the data envelope is rectified and detected by the signal detection circuit, outputting weak changes which are completely synchronous with the modulation signals through the low-pass filter circuit, and then processing and restoring the weak changes into the modulation signals through the signal shaping and amplifying circuit to output the modulation signals to the MCU.
7. The utility model provides a pedal power signal detection modulation method of electric bicycle, its characterized in that, this signal detection modulation method is realized based on an electric bicycle pedal power signal detection modulation circuit, and automobile-used signal detection modulation circuit includes: a stationary circuit module and a rotating circuit module;
stationary circuit module: the static circuit module comprises a direct-current power supply, a clock signal generation circuit, a power amplification circuit, a signal detection circuit, a low-pass filtering circuit, a signal shaping amplification circuit, a first induction coil L1 and a capacitor C1; the direct-current power supply is respectively connected with the power ends of the clock signal generation circuit, the power amplification circuit, the signal detection circuit, the low-pass filtering circuit and the signal shaping amplification circuit; the output end of the clock signal generation loop is connected with the input end of the power amplification loop, the output end of the power amplification loop is connected with one end of the first induction coil L1, the other end of the first induction coil L1 is connected with the positive electrode of the capacitor C1, and the negative electrode of the capacitor C1 is grounded; the input end of the signal detection circuit is connected to the contact point of the first induction coil L1 and the capacitor C1, the output end of the signal detection circuit is connected with the input end of the low-pass filter circuit, the output end of the low-pass filter circuit is connected with the input end of the signal shaping and amplifying circuit, and the output end of the signal shaping and amplifying circuit is connected to the MCU;
a rotation circuit module: the rotating circuit module comprises a second induction coil L3, a power resonant circuit, a rectifying circuit, a unidirectional circuit, a filtering circuit, a voltage stabilizing circuit, a strain signal acquisition circuit, a strain signal amplification circuit, a voltage-to-frequency circuit, a signal modulation output circuit, a first resistor R1 and a base resistor; the signal modulation output loop comprises a triode T1; the second induction coil L3 is connected with the power resonant circuit in parallel, the output end of the power resonant circuit is connected with the input end of the rectifying circuit, the output end of the rectifying circuit is connected with the input end of the unidirectional circuit, the output end of the unidirectional circuit is connected with the input end of the filtering circuit, the output end of the filtering circuit is connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is respectively connected with the strain signal acquisition circuit, the strain signal amplifying circuit and the power end of the voltage-to-frequency circuit; the output end of the strain signal acquisition loop is connected with the input end of the strain signal amplification loop, the output end of the strain signal amplification loop is connected with the input end of the voltage-to-frequency loop, the output end of the voltage-to-frequency loop is connected with one end of a base resistor, the other end of the base resistor is connected with the base of a triode T1, the emitter of the triode T1 is grounded, the collector of the triode T1 is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with a junction of the rectifying loop and the unidirectional loop; the first induction coil L1 of the stationary circuit module is coupled with the second induction coil L3 of the rotating circuit module;
the signal detection method comprises the following steps:
the stationary circuit module provides electric energy for the rotating circuit module through the coupling of the first induction coil L1 and the second induction coil L3; the clock signal generated by the clock signal generation circuit of the static circuit module is amplified by the power amplification circuit to output a power signal, the amplified power signal passes through the first induction coil L1 and the capacitor C to cause the first induction coil L1 to generate an induction magnetic field, and meanwhile, the capacitor C1 stores electric energy;
the second induction coil L3 of the rotating circuit module rotates in an induction magnetic field generated by the first induction coil L1, induced electromotive force is generated at two ends of the second induction coil L3, induction alternating current is generated, the induction alternating current passes through the power resonant circuit to maximize electric energy, and then the electric energy is input into the rectifying circuit, and the rectifying circuit converts the alternating current into pulse direct current and outputs the pulse direct current; the pulse direct current output by the rectification circuit is input into the filtering circuit through the unidirectional circuit, the filtering circuit filters and stores energy of the pulse direct current, the filtered direct current is input into the voltage stabilizing circuit, and the working power supplies with high stability and low ripple variation output by the voltage stabilizing circuit are respectively input into the strain signal acquisition circuit, the strain signal amplifying circuit and the power supply end of the voltage-to-frequency circuit;
the rotary circuit module transmits the modulation signal and the energy signal to the stationary circuit module through the coupling of the second induction coil L3 and the first induction coil L1;
the strain signal acquisition circuit acquires a strain signal and outputs the strain signal to the strain signal amplification circuit, the strain signal amplification circuit amplifies the strain signal according to a preset proportion and outputs the amplified strain signal to the voltage-to-frequency circuit, the voltage-to-frequency circuit converts the amplified strain signal into a square wave signal which is in linear proportion with the strain signal according to the preset proportion and outputs the square wave signal to the base electrode of the triode T1 through the base electrode resistor, and the emitter electrode of the triode T1 is connected with digital ground;
when the high level of the square wave signal is input to the base electrode of the triode T1, the triode T1 is in an off state, and the collector electrode first resistor R1 is not conducted;
when the low level of the square wave signal is input to the base electrode of the triode T1, the triode T1 is conducted, the first resistor R1 of the collector is conducted, the output voltage of the rectifying circuit is lowered, the load is increased, and the currents in the rectifying circuit, the power resonant circuit and the second induction coil L3 are changed, namely a modulation signal is output; the current changed in the second induction coil L3 causes the current in the first induction coil L1 to change, and the voltage at two ends of the capacitor C1 changes, so that the current in the power amplification loop changes, and finally the power supply power of the direct current power supply changes; at the same time, the method comprises the steps of,
the variable voltage at two ends of the capacitor C1 is input into a signal detection circuit, the signal detection circuit rectifies and detects the received variable voltage and then outputs the variable voltage to a low-pass filter circuit, the low-pass filter circuit filters a high-frequency part to obtain a signal which is completely synchronous with a modulation signal and outputs the signal to a signal shaping and amplifying circuit, and the signal shaping and amplifying circuit shapes and amplifies the received signal to restore the modulation signal and outputs the modulation signal to a control system MCU.
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| CN113086079A (en) * | 2021-05-20 | 2021-07-09 | 安乃达驱动技术(上海)股份有限公司 | Torque sensor and electric power-assisted bicycle |
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| CN1223719A (en) * | 1996-10-25 | 1999-07-21 | 三洋电机株式会社 | Manually operated travelling vehicle with auxiliary power |
| CN104163225A (en) * | 2014-08-27 | 2014-11-26 | 天津市弘塔科技有限公司 | Electric bicycle simulation torque assistance sensing control system and implementation method thereof |
| CN105857115A (en) * | 2016-06-12 | 2016-08-17 | 南京壹佰克智能科技有限公司 | Motor intelligent control system for electric bicycle |
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| CN1223719A (en) * | 1996-10-25 | 1999-07-21 | 三洋电机株式会社 | Manually operated travelling vehicle with auxiliary power |
| CN104163225A (en) * | 2014-08-27 | 2014-11-26 | 天津市弘塔科技有限公司 | Electric bicycle simulation torque assistance sensing control system and implementation method thereof |
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