Electric motor cycle monitoring circuit

Abstract

The utility model discloses a kind of electric motorcycle monitoring circuits, comprising: permanent magnet, wheel movement monitoring circuit, control circuit, alarm, alarm drive circuit and power supply;Permanent magnet is fixed on the wheel of the electric vehicle to be monitored;Wheel movement monitoring circuit includes: magnetic field induction part, detection circuit module, amplification module and comparison module, magnetic field induction part is fixed on the body of the electric vehicle to be detected, permanent magnet can be close to magnetic field induction part in the wheel rotation process, power supply first output end is powered for magnetic field induction part, the output end of magnetic field induction part is connected to detection circuit module input end, the output end of detection circuit module is connected to amplification module input end, amplification module output end is connected to comparison module input end, comparison module output end is the output end of wheel movement monitoring circuit.The electric motorcycle monitoring circuit solves the problem that electric vehicle cannot be detected whether it is moved in prior art.

Description

Technical Field

[0001] This utility model relates to vehicle monitoring circuits, specifically to a monitoring circuit for an electric motorcycle. Background Technology

[0002] Chinese patent discloses a remote safety monitoring system for electric vehicles with application number CN201620748920.6. The system includes a main controller and a mobile terminal communication module, a data acquisition module, a power supply circuit, a reset circuit, and a motor drive module, all connected to the main controller. The output of the motor drive module is connected to the motor of the electric vehicle, and the mobile terminal communication module communicates with the mobile terminal.

[0003] Although the remote alarm function has been implemented, the remote safety monitoring system for electric vehicles still has the following drawbacks: since electric vehicles are often stolen, and the existing technology cannot detect whether they have been moved, it is impossible to remotely detect whether theft has occurred. Utility Model Content

[0004] This utility model provides a monitoring circuit for electric motorcycles, solving the problem in the prior art that electric vehicles cannot detect whether they have been moved.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: This utility model discloses an electric motorcycle monitoring circuit, including: a permanent magnet, a wheel movement monitoring circuit, a control circuit, an alarm, an alarm drive circuit, and a power supply; a permanent magnet is fixed on the wheel of the electric motorcycle to be monitored; the wheel movement monitoring circuit includes: a magnetic field sensing unit, a detection circuit module, an amplification module, and a comparison module. The magnetic field sensing unit is fixed on the body of the electric motorcycle to be monitored. The permanent magnet can approach the magnetic field sensing unit as the wheel rotates. The first output terminal of the power supply supplies power to the magnetic field sensing unit. The output terminal of the magnetic field sensing unit is connected to the input terminal of the detection circuit module. The output terminal of the detection circuit module is connected to the input terminal of the amplification module. The output terminal of the amplification module is connected to the input terminal of the comparison module. The output terminal of the comparison module is the output terminal of the wheel movement monitoring circuit; the first output terminal of the power supply supplies power to the alarm through the alarm drive circuit. The control terminal of the alarm drive circuit is connected to the first output terminal of the control circuit. The second output terminal of the power supply supplies power to the control circuit.

[0006] Preferably, the magnetic field sensing part is a reed switch, the first output terminal of the power supply is powered by one end of the reed switch, and the other end of the reed switch is the output terminal of the magnetic field sensing part.

[0007] Preferably, the magnetic field sensing unit is a Hall sensor, the first output terminal of the power supply powers the Hall sensor, and the output terminal of the Hall sensor is the output terminal of the magnetic field sensing unit.

[0008] Preferably, the electric motorcycle monitoring circuit further includes an Internet of Things (IoT) circuit, which is communicatively connected to the control circuit.

[0009] Preferably, the electric motorcycle monitoring circuit further includes a GPS positioning circuit and a positioning drive circuit. The third output terminal of the power supply provides power to the GPS positioning circuit through the positioning drive circuit. The GPS positioning circuit is communicatively connected to the control circuit, and the control terminal of the positioning drive circuit is connected to the second output terminal of the control circuit.

[0010] Preferably, the detection circuit module includes: resistor R1 and resistor R2, the first end of resistor R1 is the input end of the detection circuit module, the second end of resistor R1 is the output end of the detection circuit module, and the second end of resistor R1 is grounded through resistor R2.

[0011] Preferably, the amplifier circuit includes: resistors R3, R4, R5, R6, R7, R8, and R9; capacitors C1, C2, C3, and C4; NPN transistors Q1 and Q2; the first terminals of resistors R3, R5, and R7, as well as the positive terminal of capacitor C4, are all connected to the first output terminal of the power supply; the second terminal of resistor R3 is connected to the base of NPN transistor Q1 and the positive terminal of capacitor C1; the negative terminal of capacitor C1 is grounded; and the positive terminal of capacitor C1 is the input terminal of the amplifier circuit. The collector of transistor Q1 is connected to the second terminal of resistor R5 and the base of NPN transistor Q2. The emitter of NPN transistor Q1 is connected to the first terminal of resistor R6 and the positive terminal of capacitor C2. The second terminal of resistor R6 and the negative terminal of capacitor C2 are grounded. The collector of NPN transistor Q2 is connected to the second terminal of resistor R7 and the negative terminal of capacitor C4. The base of NPN transistor Q2 is connected to the first terminal of resistor R8 and the positive terminal of capacitor C3. The negative terminal of capacitor C3 is the output terminal of the amplifier circuit. The positive terminal of capacitor C3 is connected to the first terminal of resistor R9. The second terminals of resistor R8 and R9 are grounded.

[0012] Preferably, the comparator circuit includes: resistor R10, resistor R11 and comparator U1. The first end of resistor R10 is connected to the first output terminal of the power supply, the second end of resistor R10 is grounded through resistor R11, the second end of resistor R10 is connected to the inverting input terminal of comparator U1, the non-inverting input terminal of comparator U1 is the input terminal of the comparator circuit, and the output terminal of comparator U1 is the output terminal of the comparator circuit.

[0013] Preferably, the positioning drive circuit includes: resistor R12, resistor R13, capacitor C5, and PMOS transistor Q3. The first end of resistor R12, the source of PMOS transistor Q3, and the positive terminal of capacitor C5 are all connected to the third output terminal of the power supply. The second end of resistor R12 is connected to the gate of PMOS transistor Q3 and the first end of resistor R13. The drain of PMOS transistor Q3 is the output terminal of the positioning drive circuit. The negative terminal of capacitor C5 is grounded. The second end of resistor R13 is the control terminal of the positioning drive circuit.

[0014] Preferably, the alarm driving circuit includes: resistor R14, resistor R15, diode D1, inductor L1, and NPN transistor Q4. The first terminal of resistor R14 is the control terminal of the alarm driving circuit. The second terminal of resistor R14 is connected to the base of NPN transistor Q4. The emitter of NPN transistor Q4 is grounded. The collector of NPN transistor Q4 is connected to the cathode of diode D1, the first terminal of inductor L1, and the negative terminal of the buzzer. The second terminal of inductor L1 is connected to the first terminal of resistor R15. The second terminal of resistor R15 and the positive terminal of the buzzer are both connected to the first output terminal of the power supply. The anode of diode D1 is grounded.

[0015] Compared to existing technologies, this invention has the following advantages: In this application, a permanent magnet is placed on the wheel, but not at the wheel's center. The permanent magnet rotates with the wheel. A magnetic field sensing unit is installed on the vehicle body. As the permanent magnet rotates with the wheel, the magnetic field sensing unit can sense the magnetic field of the permanent magnet when it approaches. Therefore, by sensing the permanent magnet's movement, the rotation of the wheel is detected. When the electric vehicle is stolen, the wheel will rotate, allowing the vehicle to be moved. Thus, this design can detect when the electric vehicle is being moved. After the magnetic field sensing unit detects the change in voltage at its output terminal, the detection circuit module detects this change and outputs it to the amplification module. The amplification module amplifies this analog voltage, and after amplification, a comparison module compares the analog voltage and outputs a high or low level. The comparison module converts the analog voltage into a digital voltage signal that the control circuit can receive. When the control circuit detects wheel movement, it can determine whether the electric vehicle has been stolen, and thus issue an alarm when the theft occurs.

[0016] Other advantages, objectives and features of this invention will be apparent in part from the following description, and in part from the understanding of those skilled in the art through study and practice of this invention. Attached Figure Description

[0017] Figure 1 This is a circuit diagram of the magnetic field induction unit, detection circuit module, and amplification module in the monitoring circuit of an electric motorcycle.

[0018] Figure 2 This is the circuit diagram for the comparison module.

[0019] Figure 3 This is the circuit diagram for the control circuit.

[0020] Figure 4 This is a circuit diagram for the Internet of Things (IoT) circuit.

[0021] Figure 5 This is a circuit diagram of the GPS positioning circuit.

[0022] Figure 6 This is a circuit diagram of the positioning drive circuit.

[0023] Figure 7 This is a circuit diagram of the alarm and alarm drive circuit. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] like Figures 1 to 7 As shown, this utility model discloses a monitoring circuit for an electric motorcycle, including: a permanent magnet, a wheel movement monitoring circuit, a control circuit, an alarm, an alarm drive circuit, and a power supply. A permanent magnet is fixed to the wheel of the electric motorcycle to be monitored. The wheel movement monitoring circuit includes: a magnetic field sensing unit S1, a detection circuit module, an amplification module, and a comparison module. The magnetic field sensing unit S1 is fixed to the body of the electric motorcycle to be monitored. The permanent magnet can approach the magnetic field sensing unit S1 as the wheel rotates. The first output terminal of the power supply supplies power to the magnetic field sensing unit S1. The output terminal of the magnetic field sensing unit S1 is connected to the input terminal of the detection circuit module. The output terminal of the detection circuit module is connected to the input terminal of the amplification module. The output terminal of the amplification module is connected to the input terminal of the comparison module. The output terminal of the comparison module is the output terminal of the wheel movement monitoring circuit. The first output terminal of the power supply supplies power to the alarm through the alarm drive circuit. The control terminal of the alarm drive circuit is connected to the first output terminal of the control circuit. The second output terminal of the power supply supplies power to the control circuit.

[0026] In this application, the first output terminal of the power supply outputs a 5V DC voltage, the second output terminal of the power supply outputs a 3.8V DC voltage, and the third output terminal of the power supply outputs a 3.3V DC voltage.

[0027] In one embodiment of the magnetic field sensing unit S1, the magnetic field sensing unit S1 is a reed switch. The first output terminal of the power supply supplies power to one end of the reed switch, and the other end of the reed switch is the output terminal of the magnetic field sensing unit S1. The reed switch closes when the permanent magnet approaches, at which time there is a voltage output at the output terminal of the magnetic field sensing unit S1. The reed switch opens when the permanent magnet moves away, at which time there is no voltage output at the output terminal of the magnetic field sensing unit S1. The permanent magnet undergoes the above-mentioned changes as it rotates one revolution with the wheel, thereby detecting whether the wheel is rotating.

[0028] In another embodiment of the magnetic field sensing unit S1, the magnetic field sensing unit S1 is a Hall sensor. The first output terminal of the power supply powers the Hall sensor, and the output terminal of the Hall sensor is the output terminal of the magnetic field sensing unit S1. When the position of the permanent magnet changes, the magnetic field changes, and the voltage at the output terminal of the Hall sensor changes accordingly. By detecting this change, the rotation of the permanent magnet as the wheel rotates is sensed.

[0029] like Figure 4 As shown, the electric motorcycle monitoring circuit also includes an Internet of Things (IoT) circuit, which is communicatively connected to the control circuit. The IoT circuit primarily uses an IoT chip, such as the ML307R-DL, but other models can also be used. This allows the control circuit to communicate with terminals such as mobile phones via the IoT circuit, enabling remote monitoring of the electric motorcycle's status. It can also be commanded to detect whether the electric motorcycle has been stolen by detecting wheel rotation during a specific time period.

[0030] Preferably, the electric motorcycle monitoring circuit further includes a GPS positioning circuit and a positioning drive circuit. The third output terminal of the power supply provides power to the GPS positioning circuit through the positioning drive circuit. The GPS positioning circuit is communicatively connected to the control circuit, and the control terminal of the positioning drive circuit is connected to the second output terminal of the control circuit. When an electric motorcycle is stolen, its location may change. Therefore, a GPS positioning circuit is designed to locate the motorcycle's position, and a positioning drive circuit is also designed to automatically activate the GPS positioning circuit when the theft is detected.

[0031] In this application, the detection circuit module includes resistors R1 and R2. The first terminal of resistor R1 is the input terminal of the detection circuit module, and the second terminal of resistor R1 is the output terminal of the detection circuit module. The second terminal of resistor R1 is grounded through resistor R2. Resistors R1 and R2 serve to stabilize and reduce voltage.

[0032] In this application, the amplifier circuit includes: resistors R3, R4, R5, R6, R7, R8, and R9; capacitors C1, C2, C3, and C4; NPN transistors Q1 and Q2. The first terminals of resistors R3, R5, and R7, as well as the positive terminal of capacitor C4, are all connected to the first output terminal of the power supply. The second terminal of resistor R3 is connected to the base of NPN transistor Q1 and the positive terminal of capacitor C1. The negative terminal of capacitor C1 is grounded, and the positive terminal of capacitor C1 is the input terminal of the amplifier circuit. The collector of transistor Q1 is connected to the second terminal of resistor R5 and the base of NPN transistor Q2. The emitter of NPN transistor Q1 is connected to the first terminal of resistor R6 and the positive terminal of capacitor C2. The second terminal of resistor R6 and the negative terminal of capacitor C2 are grounded. The collector of NPN transistor Q2 is connected to the second terminal of resistor R7 and the negative terminal of capacitor C4. The base of NPN transistor Q2 is connected to the first terminal of resistor R8 and the positive terminal of capacitor C3. The negative terminal of capacitor C3 is the output terminal of the amplifier circuit. The positive terminal of capacitor C3 is connected to the first terminal of resistor R9. The second terminals of resistor R8 and R9 are grounded. The function of resistor R3 is to increase the voltage at the base of NPN transistor Q1 when it is turned on. The function of the positive terminal of capacitor C1 is to stabilize the voltage at the base of NPN transistor Q1. When NPN transistor Q1 is turned off, resistor R6 and capacitor C2 stabilize the voltage at the collector of NPN transistor Q1. NPN transistors Q1 and Q2 form a two-stage amplification. Resistor R8, capacitor C3, and resistor R9 stabilize the output voltage of the amplifier module.

[0033] Because the detection circuit module has resistor R2, directly using R3 to raise the voltage at NPN transistor Q1 would create a closed circuit between R2 and R3, resulting in a continuous voltage level at the base of NPN transistor Q1. Therefore, diode D2 was designed. The positive terminal of capacitor C1 is connected to the anode of diode D2, and the cathode of diode D2 is connected to the second terminal of resistor R3 and the base of NPN transistor Q1. Diode D2 acts as a current limiter, preventing current from flowing from resistor R3 to resistor R2, thus avoiding a continuous high voltage level at the base of NPN transistor Q1 and the inability to control its opening or closing. This ensures that resistor R3 can raise the voltage when there is voltage output at the cathode of diode D2, while preventing current from flowing from resistor R3 to resistor R2 and causing a continuous high voltage level at the base of NPN transistor Q1.

[0034] Preferably, the comparator circuit includes: resistors R10 and R11, and comparator U1. The first terminal of resistor R10 is connected to the first output terminal of the power supply, and the second terminal of resistor R10 is grounded through resistor R11. The second terminal of resistor R10 is connected to the inverting input terminal of comparator U1, the non-inverting input terminal of comparator U1 is the input terminal of the comparator circuit, and the output terminal of comparator U1 is the output terminal of the comparator circuit. Resistors R10 and R11 divide the voltage to provide a reference voltage to the inverting input terminal of comparator U1. The output voltage of the amplification module is compared with the reference voltage. If the output voltage of the amplification module is greater than the reference voltage (at which point the permanent magnet is closer to the magnetic field induction unit S1), comparator U1 outputs a high level; if the output voltage of the amplification module is less than the reference voltage (at which point the permanent magnet is farther from the magnetic field induction unit S1), comparator U1 outputs a low level.

[0035] In this application, the positioning drive circuit includes: resistors R12 and R13, capacitor C5, and PMOS transistor Q3. The first terminal of resistor R12, the source of PMOS transistor Q3, and the positive terminal of capacitor C5 are all connected to the third output terminal of the power supply. The second terminal of resistor R12 is connected to the gate of PMOS transistor Q3 and the first terminal of resistor R13. The drain of PMOS transistor Q3 is the output terminal of the positioning drive circuit. The negative terminal of capacitor C5 is grounded. The second terminal of resistor R13 is the control terminal of the positioning drive circuit. When the second terminal of resistor R13 is at a high level, the gate of PMOS transistor Q3 is at a high level, and PMOS transistor Q3 is disconnected, resulting in no power to the GPS positioning circuit and the GPS positioning circuit not operating. When the second terminal of resistor R13 is at a low level, the gate of PMOS transistor Q3 is at a low level, and PMOS transistor Q3 is closed, resulting in power to the GPS positioning circuit and the GPS positioning circuit operating.

[0036] In this application, the alarm driving circuit includes: resistor R14, resistor R15, diode D1, inductor L1, and NPN transistor Q4. The first terminal of resistor R14 is the control terminal of the alarm driving circuit. The second terminal of resistor R14 is connected to the base of NPN transistor Q4. The emitter of NPN transistor Q4 is grounded. The collector of NPN transistor Q4 is connected to the cathode of diode D1, the first terminal of inductor L1, and the negative terminal of the buzzer. The second terminal of inductor L1 is connected to the first terminal of resistor R15. The second terminal of resistor R15 and the positive terminal of the buzzer are both connected to the first output terminal of the power supply. The anode of diode D1 is grounded. When the first terminal of resistor R14 is at a high level, the base of NPN transistor Q4 is at a high level, NPN transistor Q4 is closed, the buzzer is powered on, and an alarm sounds. When the first terminal of resistor R14 is at a low level, the base of NPN transistor Q4 is at a low level, NPN transistor Q4 is open, the buzzer is not powered on, and no alarm sounds.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A monitoring circuit for electric motorcycles, characterized in that, include: Permanent magnet, wheel movement monitoring circuit, control circuit, alarm, alarm drive circuit and power supply; Permanent magnets are fixed to the wheels of the electric vehicle to be monitored; The wheel movement monitoring circuit includes: a magnetic field sensing unit, a detection circuit module, an amplification module, and a comparison module. The magnetic field sensing unit is fixed on the body of the electric vehicle to be tested. The permanent magnet can approach the magnetic field sensing unit as the wheel rotates. The first output terminal of the power supply supplies power to the magnetic field sensing unit. The output terminal of the magnetic field sensing unit is connected to the input terminal of the detection circuit module. The output terminal of the detection circuit module is connected to the input terminal of the amplification module. The output terminal of the amplification module is connected to the input terminal of the comparison module. The output terminal of the comparison module is the output terminal of the wheel movement monitoring circuit. The first output terminal of the power supply powers the alarm through the alarm drive circuit. The control terminal of the alarm drive circuit is connected to the first output terminal of the control circuit, and the second output terminal of the power supply powers the control circuit.

2. The electric motorcycle monitoring circuit according to claim 1, characterized in that, The magnetic field sensing part is a reed switch. The first output terminal of the power supply supplies power to one end of the reed switch, and the other end of the reed switch is the output terminal of the magnetic field sensing part.

3. The electric motorcycle monitoring circuit according to claim 1, characterized in that, The magnetic field sensing unit is a Hall sensor, the first output terminal of the power supply powers the Hall sensor, and the output terminal of the Hall sensor is the output terminal of the magnetic field sensing unit.

4. The electric motorcycle monitoring circuit according to claim 2 or 3, characterized in that, Also includes: Internet of Things (IoT) circuits, which communicate with control circuits.

5. The electric motorcycle monitoring circuit according to claim 4, characterized in that, Also includes: The GPS positioning circuit and the positioning drive circuit are connected. The third output terminal of the power supply provides power to the GPS positioning circuit through the positioning drive circuit. The GPS positioning circuit is connected to the control circuit. The control terminal of the positioning drive circuit is connected to the second output terminal of the control circuit.

6. The electric motorcycle monitoring circuit according to claim 2 or 3, characterized in that, The detection circuit module includes resistors R1 and R2. The first end of resistor R1 is the input terminal of the detection circuit module, the second end of resistor R1 is the output terminal of the detection circuit module, and the second end of resistor R1 is grounded through resistor R2.

7. The electric motorcycle monitoring circuit according to claim 6, characterized in that, The amplifier circuit includes: resistors R3, R4, R5, R6, R7, R8, and R9; capacitors C1, C2, C3, and C4; NPN transistors Q1 and Q2. The first terminals of resistors R3, R5, and R7, as well as the positive terminal of capacitor C4, are connected to the first output terminal of the power supply. The second terminal of resistor R3 is connected to the base of NPN transistor Q1 and the positive terminal of capacitor C1. The negative terminal of capacitor C1 is grounded, and the positive terminal of capacitor C1 is the input terminal of the amplifier circuit. The collector of transistor Q1 is connected to the second terminal of resistor R5 and the base of NPN transistor Q2. The emitter of NPN transistor Q1 is connected to the first terminal of resistor R6 and the positive terminal of capacitor C2. The second terminal of resistor R6 and the negative terminal of capacitor C2 are grounded. The collector of NPN transistor Q2 is connected to the second terminal of resistor R7 and the negative terminal of capacitor C4. The base of NPN transistor Q2 is connected to the first terminal of resistor R8 and the positive terminal of capacitor C3. The negative terminal of capacitor C3 is the output terminal of the amplifier circuit. The positive terminal of capacitor C3 is connected to the first terminal of resistor R9. The second terminals of resistor R8 and R9 are grounded.

8. The electric motorcycle monitoring circuit according to claim 7, characterized in that, The comparator circuit includes: resistor R10, resistor R11 and comparator U1. The first end of resistor R10 is connected to the first output terminal of the power supply. The second end of resistor R10 is grounded through resistor R11. The second end of resistor R10 is connected to the inverting input terminal of comparator U1. The non-inverting input terminal of comparator U1 is the input terminal of the comparator circuit. The output terminal of comparator U1 is the output terminal of the comparator circuit.

9. The electric motorcycle monitoring circuit according to claim 5, characterized in that, The positioning drive circuit includes: resistor R12, resistor R13, capacitor C5, and PMOS transistor Q3. The first end of resistor R12, the source of PMOS transistor Q3, and the positive terminal of capacitor C5 are all connected to the third output terminal of the power supply. The second end of resistor R12 is connected to the gate of PMOS transistor Q3 and the first end of resistor R13. The drain of PMOS transistor Q3 is the output terminal of the positioning drive circuit. The negative terminal of capacitor C5 is grounded. The second end of resistor R13 is the control terminal of the positioning drive circuit.

10. The electric motorcycle monitoring circuit according to claim 9, characterized in that, The alarm drive circuit includes: resistor R14, resistor R15, diode D1, inductor L1, and NPN transistor Q4. The first terminal of resistor R14 is the control terminal of the alarm drive circuit. The second terminal of resistor R14 is connected to the base of NPN transistor Q4. The emitter of NPN transistor Q4 is grounded. The collector of NPN transistor Q4 is connected to the cathode of diode D1, the first terminal of inductor L1, and the negative terminal of the buzzer. The second terminal of inductor L1 is connected to the first terminal of resistor R15. The second terminal of resistor R15 and the positive terminal of the buzzer are both connected to the first output terminal of the power supply. The anode of diode D1 is grounded.

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