An ignition switch power-off protection control circuit and method for an electric vehicle

Abstract

The present disclosure provides an ignition switch power-off protection control circuit and method for an electric vehicle, including a DC / DC converter, an ignition switch, and an MCU; the DC / DC converter is connected to a starting battery; the DC / DC is connected to a low-voltage circuit, and the low-voltage circuit includes a first relay, a second relay, a third relay, a fourth relay, and vehicle electrical appliances; the ignition switch includes an ON terminal and an OFF terminal, and the starting battery is sequentially connected to the vehicle electrical appliances through the ON terminal or the OFF terminal; the ON terminal is connected to the first relay and the second relay; the OFF terminal is connected to the third relay; through circuit control, all electrical components of the vehicle are in a power-off state after the ignition switch is turned off, and the MCU determines whether the vehicle is in a driving or stopped state through the states of the vehicle speed and the gear switch, preventing the entire vehicle from losing power due to a failure or damage of the starting switch.

Description

Technical Field

[0001] The present disclosure relates to the technical fields of electric vehicles and battery technologies, and particularly relates to an ignition switch power-off protection control circuit and method for an electric vehicle. Background Art

[0002] The statements in this part merely provide background technical information related to the present disclosure, and do not necessarily constitute prior art.

[0003] With the development of technology, new energy products constantly appear in front of people, and more and more electric vehicles, electric bicycles / motorcycles are put into the market; when an electric vehicle is stored, there is a state where the starting battery has a small current consumption. As time goes by, the power of the starting battery will be very low. The electric motorcycle consumes electricity during long-term parking, so the vehicle must be charged within a certain period of time, otherwise the vehicle will not start. At the same time, there are also problems that the real-time charging state of the vehicle cannot be determined during the charging process, and the amount of electricity is unknown; and during the driving process of an electric bicycle / motorcycle, when the start switch fails or is damaged, the whole vehicle will lose power and cannot normally drive to the destination or the repair place, which brings great inconvenience to people's lives and causes troubles to users. Summary of the Invention

[0004] In order to solve the above problems, the present disclosure provides an ignition switch power-off protection control circuit and method for an electric vehicle, so that when the electric vehicle is powered off, the electrical components of the whole vehicle do not consume the power of the starting battery, and the charging state can also be displayed by a charging indicator during the charging process. During the driving process of the vehicle, the MCU is used to judge the driving state of the vehicle and the state of the ignition switch, and through processing, the normal driving of the electric vehicle is ensured.

[0005] According to some embodiments, the present disclosure adopts the following technical solutions:

[0006] An ignition switch power-off protection control circuit for an electric vehicle, comprising:

[0007] A DC / DC converter, an ignition switch, and an MCU;

[0008] The DC / DC converter is connected to the starting battery; the DC / DC is connected to a low-voltage circuit, and the low-voltage circuit includes a first relay, a second relay, a third relay, a fourth relay, and vehicle electrical appliances;

[0009] The ignition switch includes an ON terminal and an OFF terminal, and the starting battery is sequentially connected to the vehicle electrical appliances through the ON terminal or the OFF terminal; the ON terminal is connected to the first relay and the second relay; the OFF terminal is connected to the third relay.

[0010] Further, the vehicle electrical appliances include a BCM controller, a horn, a headlight instrument, and a battery management system.

[0011] Further, one end of the third relay is connected to one end of the vibration switch, and the other end of the vibration switch is connected to the vehicle body.

[0012] Further, the other end of the first relay is connected to the DC / DC converter.

[0013] Further, the MCU is connected to the BCM controller and the instrument, and the MCU sends the switch gear position status information to the instrument through the Can bus.

[0014] The BCM controller is connected to the starting battery through the READY S / W switch.

[0015] According to some other embodiments, the present disclosure adopts the following technical solutions:

[0016] A control method for an ignition switch power-off protection control circuit for an electric vehicle, including: the MCU determines whether the vehicle is in a driving start or stop state through the states of the vehicle speed and the gear switch. Specifically:

[0017] When the ignition switch is in the ON-end conducting state, the BCM controller, the instrument, and the MCU all work normally. When the READY S / W switch outputs a READY signal to the BCM controller, after receiving the signal from the READY switch, the BCM controller outputs the READY signal to the MCU through the wire harness;

[0018] When the MCU receives the READY signal from the BCM controller, it outputs the READY information to the instrument through the CAN bus. After receiving the READY information, the instrument will display the READY status.

[0019] Further, after the gear switch is turned on, when the MCU receives the D-gear / N-gear information from the gear switch, it directly sends the gear information to the instrument through the CAN bus, and the instrument displays the current gear status.

[0020] Further, when the ignition lock is damaged or the switch fails, the MCU will determine whether to cut off the power by judging the accelerator signal / READY signal / ON signal / D-gear signal.

[0021] Further, when the ignition switch is in the OFF state, the 30th and 87th pins of the first relay and the second relay are in the disconnected state, and all the electrical appliances of the vehicle are in the power-off state.

[0022] Compared with the prior art, the beneficial effects of the present disclosure are:

[0023] The present disclosure ensures that the vehicle can operate normally in situations other than when the vehicle is in use, and can drive to a repair shop for repair; it avoids the inconvenience brought to customers due to the damage of the ignition switch, which makes the vehicle unable to reach the destination; the added display of the fault status on the instrument helps customers use the vehicle better, and gives an early warning to let the customer drive into the repair shop for maintenance, solving the problem that the electric motorcycle consumes power during long-term parking and requires charging within a certain period of time. To increase the storage time of the vehicle, the static current of the vehicle is reduced or the static current is eliminated, thereby increasing the storage time of the vehicle.

[0024] The parking time of the vehicle is extended, which brings convenience to people; by reducing the static power consumption, the service life of the starting battery is extended, and the maintenance cost of the vehicle is reduced; the manufacturing cost is reduced through the wiring harness design, which is convenient for subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings forming a part of this disclosure are used to provide a further understanding of the disclosure. The illustrative embodiments and descriptions thereof of the disclosure are used to explain the disclosure and do not constitute an improper limitation of the disclosure.

[0026] Figure 1 It is a schematic diagram of the vehicle circuit connection after the ignition switch of the present disclosure is turned off;

[0027] Figure 2 It is a schematic diagram of the circuit control during the driving process of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Embodiment 1

[0032] This embodiment provides an ignition switch power-off protection control circuit for an electric vehicle, including: as Figure 1As shown, a DC / DC converter, an ignition switch, and an MCU. The DC / DC converter is connected to the starting battery, and the DC / DC is connected to a low-voltage circuit. The low-voltage circuit includes a first relay, a second relay, a third relay, a fourth relay, and vehicle electrical appliances.

[0033] The fourth relay connects the charger indicator to the charger. The second relay connects to the battery management system and is connected to the instrument, headlights, and other electrical components through a diode.

[0034] The ignition switch includes an ON terminal and an OFF terminal. The starting battery is sequentially connected to the vehicle electrical appliances through the ON terminal or the OFF terminal. The ON terminal is connected to the first relay and the second relay. The OFF terminal is connected to the third relay.

[0035] The third relay is also connected to an anti-theft alarm. When the vehicle situation is abnormal, the terminal of the third relay is turned on, and the anti-theft alarm works, then it starts to alarm to remind the driver to pay attention to vehicle safety.

[0036] The vehicle electrical appliances include a BCM controller, a horn, headlights and instrument, and a battery management system. One foot terminal of the third relay is connected to one end of a vibration switch, and the other end of the vibration switch is connected to the vehicle body.

[0037] One end of the first relay is connected to the DC / DC converter. The first relay is also connected to the second relay and the fourth relay.

[0038] As Figure 2 shown, the MCU is connected to the BCM controller and the instrument. The MCU sends switch gear position status information to the instrument through the Can bus. The MCU is connected to a gear switch, and the gear switch is connected to a ready switch.

[0039] The BCM controller is connected to the starting battery through the ready switch READY S / W. And the BCM controller is provided with a BAT port, a READY SIG port, an ON port, and a READY port. The READY port is connected to the READY port of the MCU. And there are also ports on the MCU for receiving D gear and N gear status signals, which are correspondingly connected to the D gear and N gear ports of the gear switch.

[0040] Embodiment 2

[0041] An embodiment of the present disclosure provides a control method for an ignition switch power-off protection control circuit for an electric vehicle. Based on a circuit, the circuit includes a DC / DC converter, an ignition switch, and an MCU. The DC / DC converter is connected to a starting battery, the DC / DC is connected to a low-voltage circuit, and the low-voltage circuit includes a first relay, a second relay, a third relay, a fourth relay, and vehicle electrical appliances.

[0042] The fourth relay connects the charger indicator to the charger, and the second relay connects to the battery management system and is connected to the instrument, the headlights, and other electrical components through a diode.

[0043] The ignition switch includes an ON terminal and an OFF terminal. The starting battery is sequentially connected to the vehicle electrical appliances through the ON terminal or the OFF terminal; the ON terminal is connected to the first relay and the second relay; the OFF terminal is connected to the third relay.

[0044] The third relay is also connected to an anti-theft alarm. When the vehicle situation is abnormal, the terminal pins of the third relay are connected, and the anti-theft alarm works, then it starts to alarm to remind the driver to pay attention to vehicle safety.

[0045] The vehicle electrical appliances include a BCM controller, a horn, a headlight instrument, and a battery management system. One foot terminal of the third relay is connected to one end of a vibration switch, and the other end of the vibration switch is connected to the vehicle body.

[0046] One end of the first relay is connected to the DC / DC converter, and the first relay is also connected to the second relay and the fourth relay.

[0047] As Figure 2 shown, the MCU is connected to the BCM controller and the instrument, and the MCU sends the switch gear position status information to the instrument through the Can bus. The MCU is connected to a gear switch, and the gear switch is connected to a ready switch.

[0048] The BCM controller is connected to the starting battery through the ready switch READY S / W, and the BCM controller is provided with a BAT port, a READY SIG port, an ON port, and a READY port. The READY port is connected to the READY port of the MCU, and there are also ports on the MCU for receiving the D gear and N gear status signals, which are correspondingly connected to the D gear and N gear ports of the gear switch.

[0049] The specific circuit control method is as follows:

[0050] When the vehicle is in the driving process, the MCU judges whether the vehicle is in the driving or stopped state through the vehicle speed and the status of the gear switch. The specific details are as follows:

[0051] When the ignition switch is in the ON conduction state, the BCM controller, instrument panel, and MCU all work properly. When the READY switch outputs a READY signal to the BCM controller, after receiving the signal from the READY switch, the BCM controller outputs the READY signal to the MCU through the wiring harness;

[0052] After the MCU receives the READY signal from the BCM controller, it outputs the READY information to the instrument panel through the CAN bus. After receiving the READY information, the instrument panel will display the READY status.

[0053] After the MCU receives the D gear / N gear information from the gear shift switch, it directly sends the gear information to the instrument panel through the CAN bus, and the instrument panel displays the current gear status;

[0054] If the ignition lock is damaged or the switch fails, the MCU will determine whether to cut off the power by judging the accelerator signal / READY signal / ON signal / D gear signal;

[0055] When the ignition switch is damaged, the BCM will cut off the ON-state power, and the combination instrument will cut off the ON-state power. If the D gear / accelerator signal is valid, the MCU will not cut off the power, and because the BAT power supply of the combination instrument will not be cut off and it receives the fault signal sent by the MCU through the CAN signal, it will light up and display the fault information again to notify the customer of the vehicle fault;

[0056] When the accelerator signal is invalid and the gear signal changes from D gear to N gear, the MCU actively cuts off the power, the CAN information stops being sent, and when the instrument panel does not receive the CAN information, it will automatically power off and shut down.

[0057] The circuit control to ensure that all electrical components of the vehicle are in a power-off state after turning off the ignition switch is as follows:

[0058] In the start state:

[0059] 1) When the ignition switch is in the ON state, the vehicle's electrical appliances (controller, horn, headlight, etc.), instrument panel, battery management system, and first relay work (the 30-pin and 87a-pin are connected);

[0060] 2) After the first relay works, the 12V output of the DC converter is connected to the low-voltage circuit, and the vehicle's low-voltage electrical power supply is converted from being supplied by the starting battery to being supplied by the DC converter. At this time, the starting battery is in a charging state;

[0061] In the off state:

[0062] 1) When the ignition switch is in the OFF state, the 30-pin and 87-pin of the first relay and the second relay are in the disconnected state. Therefore, all the electrical appliances of the whole vehicle are in the power-off state. As a result, no electrical appliance consumes power from the starting battery, thus improving the usage duration of the starting battery and extending its service life.

[0063] 2) Alarm function: When the ignition switch is in the OFF state, the 85-pin of the third relay is powered by the starting battery. When the vehicle receives a vibration, the vibration switch closes, causing the third relay to operate normally. The 30-pin and 87-pin of the third relay are connected, and the anti-theft alarm works and starts to alarm.

[0064] Those skilled in the art should understand that the embodiments of the present disclosure can be provided as methods, systems, or computer program products. Therefore, the present disclosure can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present disclosure can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0065] The present disclosure is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0066] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0067] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide means for implementing the functions specified in Figure 1Steps of the functions specified in one or more processes and / or boxes Figure 1 Steps of the functions specified in one or more boxes

[0068] The above are only the preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, various changes and modifications can be made to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

[0069] Although the specific implementation manners of the present disclosure have been described above in conjunction with the accompanying drawings, they do not limit the protection scope of the present disclosure. Those skilled in the art should understand that, based on the technical solutions of the present disclosure, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present disclosure.

Claims

1. An ignition switch power-off protection control circuit for an electric vehicle, characterized in that, it includes: a DC / DC converter, an ignition switch, and an MCU; The DC / DC converter is connected to the starting battery; the DC / DC is connected to the low-voltage circuit, and the low-voltage circuit includes a first relay, a second relay, a third relay, a fourth relay, and vehicle electrical appliances; the ignition switch includes an ON terminal and an OFF terminal, and the starting battery is sequentially connected to the vehicle electrical appliances through the ON terminal or the OFF terminal; the ON terminal is connected to the first relay and the second relay; the OFF terminal is connected to the third relay, and the third relay is also connected to an anti-theft alarm. When the vehicle situation is abnormal, the output circuit terminal of the third relay is turned on, and the anti-theft alarm works and starts to alarm; the fourth relay is connected to the charger indicator and the charger; The MCU is connected to the BCM controller and the instrument. The MCU sends the status information of the gear switch and the READY signal output by the READY S / W to the instrument through the Can bus; the MCU judges the vehicle status based on the vehicle speed and the status of the gear switch. When the ignition lock is damaged or the switch fails, the MCU will judge whether to cut off the power by judging the accelerator signal / READY signal / ON signal / D gear signal; when the ignition switch is damaged, the BCM will cut off the ON-state power, and the combination instrument will cut off the ON-state power. If the D gear / accelerator signal is judged to be valid by the MCU, the MCU will not cut off the power, and because the BAT power supply of the combination instrument will not be cut off and the MCU sends a fault signal through the CAN signal, it will light up again and display the fault information to notify the customer of the vehicle fault; when the accelerator signal is invalid and the gear signal changes from D gear to N gear, the MCU actively cuts off the power, the CAN information stops sending, and when the instrument does not receive the CAN information, it will automatically power off and shut down.

2. An ignition switch power-off protection control circuit for an electric vehicle according to claim 1, characterized in that, the vehicle electrical appliances include a BCM controller, a horn, a headlight instrument, and a battery management system.

3. An ignition switch power-off protection control circuit for an electric vehicle according to claim 1, characterized in that, one end of the input circuit of the third relay is connected to one end of the vibration switch, and the other end of the vibration switch is connected to the vehicle body.

4. An ignition switch power-off protection control circuit for an electric vehicle according to claim 1, characterized in that, one end of the output circuit of the first relay is connected to the DC / DC converter.

5. An ignition switch power-off protection control circuit for an electric vehicle according to claim 1, characterized in that, the BCM controller is connected to the starting battery through the READY S / W of the ready switch.

6. A control method for an ignition switch power-off protection control circuit of an electric vehicle, using the ignition switch power-off protection control circuit for an electric vehicle according to any one of claims 1-5, characterized in that, it includes: The MCU judges whether the vehicle is in a driving start or stop state based on the vehicle speed and the status of the gear switch. Specifically: When the ignition switch is in the ON - end conducting state, the BCM controller, the instrument, and the MCU all work normally. When the ready switch READYS / W outputs the READY signal to the BCM controller, after receiving the signal from the ready switch, the BCM controller outputs the READY signal to the MCU through the wiring harness; After the MCU receives the READY signal from the BCM controller, it outputs the READY information to the instrument through the CAN bus. After receiving the READY information, the instrument will display the READY status.

7. The control method of an ignition - switch power - off protection control circuit for an electric vehicle as claimed in claim 6, characterized in that, After the gear - shift switch is turned on, when the MCU receives the D - gear / N - gear information from the gear - shift switch, it directly sends the gear information to the instrument through the CAN bus, and the instrument displays the current gear status.

8. The control method of an ignition - switch power - off protection control circuit for an electric vehicle as claimed in claim 6, characterized in that, When the ignition switch is in the OFF state, the output circuits of the first relay and the second relay are both in the open state, and all the electrical appliances of the whole vehicle are in the power - off state.

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