PLC-based tail function control circuit of electric wheel vehicle

Abstract

The utility model discloses an electric wheel vehicle tail function control circuit based on PLC, relates to electronic circuit technical field, including adaptation connection PLC module, function expansion module and light module, wherein the PLC module includes MCU and with the high-pass filtering unit of MCU connection, MCU passes through the high-pass filtering unit and is connected with carrier communication bus, the function expansion module passes through the high-pass filtering unit and is connected with the light module, and the light module passes through the high-pass filtering unit and is connected with the carrier communication bus. The carrier communication bus is connected with the battery and the carrier communication module; the MCU carries out carrier communication with the carrier communication module through a carrier communication bus, and is used for controlling the function expansion module and the light module. The vehicle tail function control circuit realizes vehicle tail light control and other function control based on carrier communication, and the intelligent degree of the electric wheel vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a PLC-based rear-end function control circuit of an electric vehicle. Background Art

[0002] The application of carrier communication in the electric two- and three-wheeled vehicle industry is currently elusive. The rear of an electric two- and three-wheeled vehicle typically includes lighting modules such as turn signals, brake lights, taillights, and license plate lights, as well as other functional signal collection and control modules. Traditional taillight control is directly connected to the vehicle's headlights via wires, without involving modular circuitry. Carrier communication cannot be used to control taillights and other functions, and the level of intelligence required to implement carrier communication across the vehicle is relatively low. Utility Model Content

[0003] In response to the above problems and technical requirements, the applicant has proposed a PLC-based rear function control circuit for an electric vehicle.

[0004] The technical solution of the utility model is as follows:

[0005] A PLC-based rear function control circuit for an electric vehicle includes an adaptively connected PLC module, a function expansion module, and a lighting module, wherein:

[0006] The PLC module includes an MCU and a high-pass filtering unit connected to the MCU. The MCU is connected to the carrier communication bus through the high-pass filtering unit, and the carrier communication bus is connected to the battery and the carrier communication module. The MCU is used to control the function expansion module and the lighting module, and conducts carrier communication with the carrier communication module through the carrier communication bus.

[0007] A further technical solution is that the MCU includes a first input pin IN_P and a second input pin IN_N, and the carrier communication bus includes a carrier communication positive bus BAT+ and a carrier communication negative bus BAT-;

[0008] The high-pass filter unit includes an input filter subunit, which includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, resistor R2, inductor L1, inductor L2, inductor L3 and inductor L4, wherein,

[0009] The first input pin IN P is connected to one end of the resistor R2 and one end of the inductor L4 through the capacitor C7, the second input pin IN_N is connected to the other end of the resistor R2 and one end of the inductor L1 through the capacitor C1, the capacitor C5 is connected in parallel with the resistor R2, the other end of the inductor L1 is connected to one end of the capacitor C6, and the other end of the inductor L4 is connected to the other end of the capacitor C6.

[0010] A further technical solution is that one end of the capacitor C6 is further connected to one end of the inductor L3 and one end of the capacitor C3 through the capacitor C2, and the other end of the capacitor C6 is further connected to the other end of the inductor L3 and one end of the capacitor C8 through the capacitor C10;

[0011] The other end of the capacitor C3 is connected to the carrier communication positive bus BAT+ through the capacitor C4, and the other end of the capacitor C8 is also connected to the carrier communication negative bus BAT- through the capacitor C9.

[0012] A further technical solution is that the MCU further includes a first output pin OUT_P and a second output pin OUT_N;

[0013] The high-pass filter unit further includes an output filter subunit, which includes a resistor R5, a resistor R6, a capacitor C11, a capacitor C12, a bidirectional Zener diode Z1 and a bidirectional Zener diode Z2, wherein:

[0014] The first output pin OUT_P is connected to one end of the capacitor C11 through the resistor R5, and the other end of the capacitor C11 is connected to one end of the capacitor C3 and one end of the capacitor C4, and is grounded through the bidirectional Zener diode Z1;

[0015] The second output pin OUT_N is connected to one end of the capacitor C12 via the resistor R6 . The other end of the capacitor C12 is connected to one end of the capacitor C8 and one end of the capacitor C9 , and is grounded via the bidirectional Zener diode Z2 .

[0016] A further technical solution is that the PLC module further includes a first power supply unit;

[0017] The input end of the first power supply unit is connected to the battery through the carrier communication positive bus BAT+, the output end of the first power supply unit is connected to the MCU, and the first power supply unit is used to convert the battery voltage into the power supply voltage VCC1 to power the MCU.

[0018] A further technical solution is that the PLC module further includes a second power supply unit;

[0019] The input end of the second power supply unit is connected to the battery through the carrier communication positive bus BAT+, the output end of the second power supply unit is connected to the lighting module, and the enable end of the second power supply unit is connected to the MCU;

[0020] The MCU sends an enable signal to the second power supply unit through the enable terminal of the second power supply unit. The second power supply unit is used to convert the battery voltage into the power supply voltage VCC2 to power the lighting module under the control of the enable signal.

[0021] A further technical solution is that the lighting module includes a plurality of lamps, and the PLC module includes a plurality of switch devices corresponding to the plurality of lamps;

[0022] The first electrode terminal of the switch device is connected to the output terminal of the second power supply unit, the second electrode terminal of the switch device is connected to the MCU, and the third electrode terminal of the switch device is connected to the corresponding lamp.

[0023] A further technical solution is that the switching device is a MOS tube or a triode.

[0024] A further technical solution is that the MCU is further connected to a function expansion module, performs UART communication with the function expansion module and outputs multiple function signals to the function expansion module.

[0025] A further technical solution is that the PLC module further includes a first connector and a second connector, the lamp is connected to the corresponding switch device through the first connector, and the function expansion module is connected to the MCU through the second connector.

[0026] The beneficial technical effects of the utility model are:

[0027] The rear vehicle function control circuit provided by the present invention includes an adaptively connected PLC module, a function expansion module and a lighting module. The PLC module is connected to the carrier communication module through a carrier communication bus, and the carrier communication technology is applied to the control circuit of the electric vehicle. Based on the carrier communication, the rear vehicle light control and other function controls are realized to cooperate with the carrier communication of the entire vehicle, thereby improving the intelligence level of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic block diagram of an embodiment of a rear vehicle function control circuit provided by the utility model.

[0029] Figure 2 This is a circuit principle diagram of an embodiment of a high-pass filter circuit provided by the utility model. DETAILED DESCRIPTION

[0030] The specific implementation of the present utility model will be further described below with reference to the accompanying drawings.

[0031] The utility model provides a PLC-based rear function control circuit for an electric vehicle, comprising an adaptively connected PLC module 10, a function expansion module 30, and a lighting module 20, wherein:

[0032] The PLC module 10 includes an MCU and a high-pass filtering unit connected to the MCU. The MCU is connected to the carrier communication bus through the high-pass filtering unit, and the carrier communication bus is connected to the battery and the carrier communication module; the MCU performs carrier communication with the carrier communication module through the carrier communication bus, and is used to control the function expansion module and the lighting module.

[0033] Figure 1 This is a circuit block diagram of a PLC-based rear-end function control circuit according to an embodiment of the present invention, as shown in FIG. Figure 1 As shown, the battery supplies power to the PLC module 10 via the carrier communication bus, and the external carrier communication module communicates with the PLC module 10 via the carrier communication bus. That is, the carrier communication signal emitted by the carrier communication module can be loaded onto the MCU in the PLC module 10 via the carrier communication bus. The MCU can also emit a carrier communication signal and load it onto the carrier communication bus, sending the carrier communication signal to the external carrier communication module to complete the carrier communication. Based on the carrier communication signal, the MCU controls the lighting module 20 and the function expansion module 30 disposed at the rear of the electric vehicle to control the rear functions of the electric vehicle. Applying carrier communication technology to the control circuit of the electric vehicle improves the intelligence of the electric vehicle. The specific connection between the MCU, the lighting module 20, and the function expansion module 30 can be found in the following description.

[0034] The high-pass filtering unit in the PLC module 10 is used to perform high-pass filtering on the carrier communication bus. When the MCU receives the carrier communication signal, the battery DC voltage loaded to the MCU is filtered out, and only the carrier communication signal is retained. When the MCU sends the carrier communication signal, it acts as a carrier, enabling the MCU to perform carrier communication with the carrier communication module. The specific form of the high-pass filtering unit can be referred to the following description.

[0035] Figure 2 This is a circuit diagram of a high-pass filter unit in one embodiment of the present invention, as shown in FIG. Figure 2As shown, the MCU includes a first input pin IN_P, a second input pin IN_N, a first output pin OUT_P, and a second output pin OUT_N. The carrier communication bus includes a carrier communication positive bus BAT+ and a carrier communication negative bus BAT-. The high-pass filter unit includes an input filter subunit and an output filter subunit, wherein the input filter subunit includes capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, resistor R2, inductor L1, inductor L2, inductor L3, and inductor L4.

[0036] Specifically, in the input filter subunit, the first input pin IN_P is connected to one end of the resistor R2 and one end of the inductor L4 via capacitor C7. The second input pin IN_N is connected to the other end of the resistor R2 and one end of the inductor L1 via capacitor C1. The capacitor C5 is connected in parallel with the resistor R2. The other end of the inductor L1 is connected to one end of the capacitor C6, and the other end of the inductor L4 is connected to the other end of the capacitor C6. One end of the capacitor C6 is also connected to one end of the inductor L3 and one end of the capacitor C3 via capacitor C2. The other end of the capacitor C6 is also connected to the other end of the inductor L3 and one end of the capacitor C8 via capacitor C10. The other end of the capacitor C3 is connected to the carrier communication positive bus BAT+ via capacitor C4, and the other end of the capacitor C8 is also connected to the carrier communication negative bus BAT- via capacitor C9.

[0037] The carrier communication signal and DC voltage are input into the MCU, loaded onto capacitor C4 via the carrier communication positive bus BAT+, and loaded onto capacitor C9 via the carrier communication negative bus BAT-. Capacitors C4 and C9 filter out the DC component in the signal, retaining only the carrier communication signal. At the same time, due to various signal interferences on the bus, a bandpass circuit consisting of capacitors C1, C2, C3, C5, C6, C7, C8, C10, resistor R2, inductor L1, inductor L2, inductor L3, and inductor L4 is set to filter out unwanted interference frequencies. The carrier signal after filtering out the signal interference frequency is differentially sampled by the first input pin IN_P and the second input pin IN_N of the MCU for input into the MCU.

[0038] Furthermore, the output filter subunit includes a resistor R5, a resistor R6, a capacitor C11, a capacitor C12, a bidirectional Zener diode Z1 and a bidirectional Zener diode Z2, wherein the first output pin OUT_P is connected to one end of the capacitor C11 through the resistor R5, the other end of the capacitor C11 is connected to one end of the capacitor C3 and one end of the capacitor C4, and is grounded through the bidirectional Zener diode Z1; the second output pin OUT_N is connected to one end of the capacitor C12 through the resistor R6, the other end of the capacitor C12 is connected to one end of the capacitor C8 and one end of the capacitor C9, and is grounded through the bidirectional Zener diode Z2.

[0039] Specifically, the bidirectional Zener diode Z1 and the bidirectional Zener diode Z2 act as clamps to prevent instantaneous high voltage from being connected to the subsequent circuit and causing failure of the subsequent devices. The resistor R5, the resistor R6, the capacitor C11 and the capacitor C12 act as carriers, loading the carrier communication signal sent by the MCU from the first output pin OUT_P and the second output pin OUT_N to the carrier communication positive bus BAT+ and the carrier communication negative bus BAT- to complete communication with the external carrier communication module.

[0040] Furthermore, the PLC module 10 further includes a first power supply unit and a second power supply unit;

[0041] The input end of the first power supply unit is connected to the battery through the carrier communication positive bus BAT+, the output end of the first power supply unit is connected to the MCU, and the first power supply unit is used to convert the battery voltage into the power supply voltage VCC1 to power the MCU.

[0042] The input end of the second power supply unit is connected to the battery through the carrier communication positive bus BAT+, the output end of the second power supply unit is connected to the lighting module 20, and the enable end of the second power supply unit is connected to the MCU;

[0043] The MCU sends an enable signal to the second power supply unit through the enable terminal of the second power supply unit. The second power supply unit is used to convert the battery voltage into the power supply voltage VCC2 to power the lighting module 20 under the control of the enable signal.

[0044] Specifically, the entire electric vehicle is powered by a battery, and its static standby power consumption when normally powered is generally not more than 3mA. Because the MCU must maintain carrier communication with the external carrier communication module and constantly detect the carrier communication signal on the carrier communication bus, the MCU must be in a normally powered state. However, the lighting module 20 does not need to be in a normally powered state. If the MCU and the lighting module 20 were powered by the same power supply unit, their static standby power consumption would exceed 3mA, easily depleting the battery power and affecting the normal use of the electric vehicle. Therefore, in this embodiment, two power supply units are provided, one for the MCU and the other for the lighting module 20, to reduce power consumption.

[0045] In this embodiment, both the first power supply unit and the second power supply unit can be DCDC power supply chips. Figure 2 In the figure, DCDC1 represents the first power supply unit, and DCDC2 represents the second power supply unit. DCDC1 uses a power supply chip with low standby power consumption. DCDC1 converts the battery voltage into the power supply voltage VCC1 required by the MCU to power the MCU, and is in a constant power supply state. DCDC2 converts the battery voltage into the power supply voltage VCC2 required by the lighting module 20 to power the lighting module 20. DCDC2 does not need to be in a constant power supply state; it only needs to meet the load capacity for reliable use of the lighting module 20. Due to low power consumption considerations, the MCU enables DCDC2. When the lighting module 20 needs power, the MCU outputs an enable signal to the enable terminal of DCDC2, i.e., the EN pin. Under the enable control, DCDC2 starts working and powers the lighting module 20.

[0046] Furthermore, the lighting module 20 includes a plurality of lamps, and the PLC module 10 includes a plurality of switch devices corresponding one-to-one to the plurality of lamps;

[0047] The first electrode terminal of the switch device is connected to the output terminal of the second power supply unit, the second electrode terminal of the switch device is connected to the MCU, and the third electrode terminal of the switch device is connected to the corresponding lamp.

[0048] Specifically, the multiple lamps in the lighting module 20 can be used as the left turn signal, right turn signal, brake light, tail light or license plate light of the electric wheel vehicle. The PLC module 10 is provided with a first connector and a second connector. The lamp is connected to the first connector. Figure 1Connector 1 in the circuit is connected to the corresponding switching device, and multiple lamps are grounded through the first connector. The switching device can be a power device with switching function, such as a MOS transistor or a triode. In this embodiment, the switching devices are all PMOS transistors. When the switching device is a PMOS transistor, the first electrode terminal of the switching device is the source terminal, the second electrode terminal is the gate terminal, and the third electrode terminal is the drain terminal. The multiple output pins of the MCU are connected to the gate terminals of the PMOS transistors in a one-to-one correspondence. The MCU controls the gate voltage of the PMOS transistors to turn on the PMOS transistors, so that VCC2 is applied to the corresponding lamps, causing them to light up.

[0049] The function expansion module 30 is connected to the second connector. Figure 2 The connector 2 in the embodiment is connected to the MCU. In this embodiment, the function expansion module 30 has a UART communication module, which can communicate with the MCU through UART. In addition, the MCU can also output multiple function signals to the function expansion module 30, such as Figure 1 Function signal 1 and function signal 2 shown are used for the expansion of the rear function of the vehicle, such as realizing the charging power-off function, collecting seat cushion signals and side support signals, etc.

[0050] The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment. It is understood that other improvements and variations directly derived or imagined by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the scope of protection of the present invention.

Claims

1. A PLC-based rear-end function control circuit for an electric vehicle, characterized in that: It includes the connected PLC module, function expansion module and lighting module, among which, The PLC module includes an MCU and a high-pass filtering unit connected to the MCU. The MCU is connected to the carrier communication bus through the high-pass filtering unit, and the carrier communication bus is connected to the battery and the carrier communication module. The MCU performs carrier communication with the carrier communication module through the carrier communication bus and is used to control the function expansion module and the lighting module.

2. The PLC-based rear function control circuit of an electric vehicle according to claim 1 is characterized in that: The MCU includes a first input pin IN_P and a second input pin IN_N, and the carrier communication bus includes a carrier communication positive bus BAT+ and a carrier communication negative bus BAT-; The high-pass filter unit includes an input filter subunit, which includes capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, resistor R2, inductor L1, inductor L2, inductor L3 and inductor L4, wherein, The first input pin IN_P is connected to one end of the resistor R2 and one end of the inductor L4 through the capacitor C7, the second input pin IN_N is connected to the other end of the resistor R2 and one end of the inductor L1 through the capacitor C1, the capacitor C5 is connected in parallel with the resistor R2, the other end of the inductor L1 is connected to one end of the capacitor C6, and the other end of the inductor L4 is connected to the other end of the capacitor C6.

3. The PLC-based rear function control circuit of the electric wheeled vehicle according to claim 2 is characterized in that: One end of the capacitor C6 is further connected to one end of the inductor L3 and one end of the capacitor C3 through the capacitor C2, and the other end of the capacitor C6 is further connected to the other end of the inductor L3 and one end of the capacitor C8 through the capacitor C10; The other end of the capacitor C3 is connected to the carrier communication positive bus BAT+ through the capacitor C4, and the other end of the capacitor C8 is also connected to the carrier communication negative bus BAT- through the capacitor C9.

4. The PLC-based rear function control circuit of an electric vehicle according to claim 3 is characterized in that: The MCU further includes a first output pin OUT_P and a second output pin OUT_N; The high-pass filter unit further includes an output filter subunit, which includes a resistor R5, a resistor R6, a capacitor C11, a capacitor C12, a bidirectional Zener diode Z1 and a bidirectional Zener diode Z2, wherein: The first output pin OUT_P is connected to one end of the capacitor C11 through the resistor R5, and the other end of the capacitor C11 is connected to one end of the capacitor C3 and one end of the capacitor C4, and is grounded through the bidirectional Zener diode Z1; The second output pin OUT_N is connected to one end of the capacitor C12 via the resistor R6 . The other end of the capacitor C12 is connected to one end of the capacitor C8 and one end of the capacitor C9 , and is grounded via the bidirectional Zener diode Z2 .

5. The PLC-based rear function control circuit of the electric vehicle according to claim 2 is characterized in that: The PLC module further includes a first power supply unit; The input end of the first power supply unit is connected to the battery through the carrier communication positive bus BAT+, the output end of the first power supply unit is connected to the MCU, and the first power supply unit is used to convert the battery voltage into the power supply voltage VCC1 to power the MCU.

6. The PLC-based rear function control circuit of an electric vehicle according to claim 2, characterized in that: The PLC module also includes a second power supply unit; The input end of the second power supply unit is connected to the battery through the carrier communication positive bus BAT+, the output end of the second power supply unit is connected to the lighting module, and the enable end of the second power supply unit is connected to the MCU; The MCU sends an enable signal to the second power supply unit through the enable terminal of the second power supply unit. The second power supply unit is used to convert the battery voltage into the power supply voltage VCC2 to power the lighting module under the control of the enable signal.

7. The PLC-based rear function control circuit of an electric vehicle according to claim 2, characterized in that: The lighting module includes a plurality of lamps, and the PLC module includes a plurality of switch devices corresponding to the plurality of lamps one by one; The first electrode terminal of the switch device is connected to the output terminal of the second power supply unit, the second electrode terminal of the switch device is connected to the MCU, and the third electrode terminal of the switch device is connected to the corresponding lamp.

8. The PLC-based rear function control circuit of an electric vehicle according to claim 7, characterized in that: The switching device is a MOS tube or a triode.

9. The PLC-based rear function control circuit of an electric vehicle according to claim 7, characterized in that: The MCU is also connected to the function expansion module, performs UART communication with the function expansion module and outputs multiple function signals to the function expansion module.

10. The PLC-based rear function control circuit of an electric vehicle according to claim 7, characterized in that: The PLC module further includes a first connector and a second connector. The lamp is connected to the corresponding switch device via the first connector, and the function expansion module is connected to the MCU via the second connector.

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