A scenic spot pure electric safety braking early warning system and a control method thereof

Abstract

The present disclosure provides a scenic spot pure electric safety braking early warning system and a control method thereof, and relates to the technical field of electric vehicle control. The system comprises the following steps: acquiring vehicle power SOC and vehicle state data; evaluating the braking ability of the vehicle in the energy recovery state; determining whether the vehicle downhill switch is open; if the switch is open, the vehicle braking speed is controlled according to the set threshold value of the vehicle state in the vehicle downhill. The automatic evaluation of the current electric braking ability can remind the driver to control the vehicle speed, which is beneficial to safe driving.

Description

Technical Field

[0001] This disclosure relates to the field of electric vehicle control technology, specifically to a pure electric safety braking early warning system for scenic areas and its control method. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] With the promotion of new energy vehicles, major scenic spots have switched their operating vehicles from fuel-powered to pure electric. Due to the special operating conditions of vehicles in scenic areas, such as long uphill and downhill road conditions, the reliability of the braking system is particularly important during long downhill sections. Since pure electric vehicles do not have engine braking or retarder braking methods like fuel-powered vehicles, they currently rely on the reverse drag of the electric motor to regenerate energy and generate electricity to charge the power battery, achieving the purpose of braking and energy conversion. However, the braking force generated by the electric motor is greatly limited by the regenerative braking power of the power battery. As the regenerative braking power of the power battery is affected by the state of charge (SOC) and battery temperature (mainly low temperature), there may be problems with limited or no regenerative braking power, resulting in the electric motor being unable to brake. Relying solely on brake pads for braking can easily lead to excessively rapid wear or overheating and failure of the brake pads, resulting in brake failure and causing traffic accidents. Summary of the Invention

[0004] To address the aforementioned issues, this disclosure proposes a pure electric safety braking early warning system and its control method for scenic areas. This system can display the maximum recoverable power, current recoverable power, and actual recoverable power in real time. It can also assess the current recoverable power to determine whether the braking power will reach its maximum in the short term. By adjusting the vehicle's status, it can make adjustments to the vehicle in advance to ensure the safety and reliability of downhill braking.

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

[0006] A control method for a pure electric safety braking early warning system in scenic areas includes:

[0007] Acquire vehicle power SOC and vehicle status data;

[0008] Evaluate the braking capacity of a vehicle under regenerative braking conditions;

[0009] Determine whether the vehicle's downhill switch is turned on. If it is, control the vehicle's braking speed according to the set threshold that the vehicle's status meets during downhill driving.

[0010] Furthermore, the vehicle status data includes the total battery voltage, the real-time total battery current, the current charge status, and the brake pedal opening.

[0011] Furthermore, a method for evaluating the braking capacity of a vehicle under regenerative braking conditions is to set up a progress bar on the vehicle's instrument panel display screen. The progress bar is divided into three progressive color levels, displayed from light to dark.

[0012] Furthermore, the shallowest progress bar displays the maximum recoverable power value, the intermediate progress bar displays the current recoverable power value, and the deepest progress bar displays the current actual recoverable power value.

[0013] Furthermore, the specific method for determining whether the vehicle's downhill switch is on, and if it is on, to control the vehicle's braking speed based on a set threshold value for the vehicle's state during downhill driving, includes:

[0014] When the downhill switch is turned on, if the SOC is ≥98% and the brake pedal opening is ≥10%, the instrument panel will display "Battery does not support energy recovery, no electric braking, please drive with caution".

[0015] Furthermore, it also includes: when SOC < 98%, if the product of motor torque and motor speed is greater than the current regenerative braking power and the BMS issues a message that the battery is heating up, it will prompt that the power battery is heating up and ask you to drive carefully, and calculate and display the remaining heating time.

[0016] If the vehicle speed exceeds 20 km / h at this time, the instrument panel will issue an overspeed warning to remind the driver to control the speed.

[0017] Furthermore, when the product of motor torque and motor speed is less than or equal to the current regenerative braking power, the BMS issues a message indicating that the battery is not heating and cancels the instrument display.

[0018] According to some embodiments, the present disclosure adopts the following technical solutions:

[0019] A pure electric vehicle safety braking early warning system for scenic areas includes:

[0020] The power battery management system (BMS) is used to acquire vehicle power SOC and vehicle status data.

[0021] The vehicle control unit (VCU) is used to evaluate the braking capability of a vehicle under regenerative braking conditions.

[0022] The motor controller MCU is used to determine whether the vehicle downhill switch is turned on. If it is turned on, the braking speed of the vehicle is controlled according to the threshold value that the vehicle status meets during the downhill process.

[0023] According to some embodiments, the present disclosure adopts the following technical solutions:

[0024] A non-transitory computer-readable storage medium is provided for storing computer instructions, which, when executed by a processor, implement the control method of a scenic area pure electric safety braking early warning system.

[0025] According to some embodiments, the present disclosure adopts the following technical solutions:

[0026] An electronic device includes a processor, a memory, and a computer program; wherein the processor is connected to the memory, the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to perform a control method for implementing a scenic area pure electric safety braking early warning system.

[0027] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0028] The method disclosed herein provides an intuitive indication of the braking performance of pure electric vehicles during downhill driving in scenic areas, offering guidance for drivers.

[0029] It enables automatic assessment of the current electric braking capability and provides alerts when the maximum braking force cannot be achieved, allowing the driver to control the vehicle speed and thus promoting safe driving.

[0030] This invention can maximize the use of electric braking for downhill driving, improve energy recovery efficiency, and reduce overall vehicle energy consumption. Attached Figure Description

[0031] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0032] Figure 1 This is a schematic diagram of the system connection according to an embodiment of the present disclosure;

[0033] Figure 2 This is a diagram showing the braking energy recovery status according to an embodiment of the present disclosure;

[0034] Figure 3 This is a diagram showing the battery heating status according to an embodiment of the present disclosure;

[0035] Figure 4 This is a logic diagram of the control method for a pure electric safety braking warning system according to an embodiment of this disclosure. Detailed implementation method:

[0036] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Example 1

[0040] One embodiment of this disclosure proposes a control method for a pure electric safety braking early warning system in scenic areas, including:

[0041] Acquire vehicle power SOC and vehicle status data;

[0042] Evaluate the braking capacity of a vehicle under regenerative braking conditions;

[0043] Determine whether the vehicle's downhill switch is turned on. If it is, control the vehicle's braking speed according to the set threshold that the vehicle's status meets during downhill driving.

[0044] As one example, vehicle status data includes total battery voltage, real-time total battery current, current charge status, and brake pedal opening. It also includes motor torque and motor speed.

[0045] As one embodiment, a method for evaluating the braking capacity of a vehicle under regenerative braking conditions is to set up a progress bar on the vehicle's instrument display screen. The progress bar is divided into three progressive color levels, displayed from light to dark.

[0046] The instrument panel features a progress bar with three distinct color gradients, from light to dark. The lightest progress bar displays the maximum recoverable power, the middle-colored bar displays the current recoverable power, and the darkest bar displays the actual recoverable power.

[0047] As one embodiment, the specific method for determining whether the vehicle downhill switch is turned on, and if so, controlling the vehicle braking speed according to a set threshold value satisfied by the vehicle's state during downhill driving, includes:

[0048] When the downhill switch is turned on, if the SOC is ≥98% and the brake pedal opening is ≥10%, the instrument panel will display "The battery does not support energy recovery, there is no electric braking, please drive with caution";

[0049] When SOC < 98%, and the product of motor torque and motor speed is greater than the current regenerative braking power, the BMS will issue a message that the battery is heating up, prompting the driver to drive cautiously, and will calculate and display the remaining heating time.

[0050] If the vehicle speed exceeds 20 km / h at this time, the instrument panel will issue an overspeed warning to remind the driver to control the speed.

[0051] When the product of motor torque and motor speed is less than or equal to the current regenerative braking power, the BMS issues a message indicating that the battery is not heating and cancels the instrument display.

[0052] Specifically, when the downhill switch is turned on, if the SOC is ≥98% and the brake pedal opening is ≥10%, the instrument panel will display "Battery does not support energy recovery, no electric braking, please drive with caution".

[0053] When the downhill switch is turned on, if SOC < 98%: when T max *N>P lim When the BMS sends a message that the battery is heating up, it will prompt you to drive cautiously and calculate and display the remaining heating time.

[0054]

[0055] Among them, M lef t represents the remaining heating time. t The average temperature at which the battery stops heating, t min V is the lowest temperature of the monomer. j This refers to the battery heating rate.

[0056] If the vehicle speed exceeds 20 km / h, the instrument panel will issue an overspeed warning to remind the driver to control the speed and ensure driving safety.

[0057] When Tmax*n≤Plim, and the BMS issues a message that the battery is not heating, the above icon will be canceled.

[0058] The data acquisition methods are as follows, t ave The average temperature of the monomer.

[0059] Maximum recoverable power P max as follows:

[0060]

[0061] Among them, P max For maximum recoverable power, Imax U represents the maximum current, and U represents the total battery voltage.

[0062] Charging power limit (30s estimate) P lim as follows:

[0063]

[0064] Among them, I lim Issue the BMS with the allowable charging current limit for the power battery (estimated value over 30 seconds).

[0065] Actual recovery power P rec as follows:

[0066]

[0067] Where N is the motor speed and T is the motor torque.

[0068] Current percentage of regenerative braking power K lim as follows:

[0069]

[0070] Among them, K lim P represents the current percentage of regenerative braking power. lim For the current regenerative braking power, P max This represents the maximum recoverable power.

[0071] Current actual recovery power percentage K rec as follows:

[0072]

[0073] Among them, P rec This represents the actual power recovered.

[0074] Example 2

[0075] One embodiment of this disclosure provides a scenic area pure electric safety braking warning system, including: a power battery management system (BMS) for acquiring vehicle power SOC and vehicle status data;

[0076] The vehicle control unit (VCU) is used to evaluate the braking capability of a vehicle under regenerative braking conditions.

[0077] The motor controller MCU is used to determine whether the vehicle downhill switch is turned on. If it is turned on, the braking speed of the vehicle is controlled according to the threshold value that the vehicle status meets during the downhill process.

[0078] It also includes a combination instrument panel for vehicle information display and brake warning information processing system.

[0079] Furthermore, the downhill switch and brake pedal are connected to the VCU. The VCU determines whether it is in downhill mode by the status of the downhill switch, and determines the opening degree of the brake pedal by judging the voltage information emitted by the brake pedal.

[0080] The vehicle control unit (VCU) is also connected to the MCU, BMS, and instrument cluster via CAN, enabling information exchange between the MCU, BMS, and instrument cluster.

[0081] The power battery management system (BMS) is connected to the VCU and instrument cluster via CAN, and sends information such as the total voltage, total current, SOC, and average temperature of individual cells of the power battery to the VCU and instrument cluster.

[0082] The motor controller MCU is connected to the VCU via CAN, and sends the actual torque and speed of the motor to the VCU. The VCU controls the braking reverse torque that occurs during braking by using the charging current and charging power limits sent by the BMS, so as to prevent the charging current overload from causing safety accidents.

[0083] Example 3

[0084] One embodiment of this disclosure provides a non-transitory computer-readable storage medium for storing computer instructions. When the computer instructions are executed by a processor, they implement the control method of a scenic area pure electric safety braking early warning system.

[0085] Example 4

[0086] One embodiment of this disclosure provides an electronic device, including: a processor, a memory, and a computer program; wherein the processor is connected to the memory, and the computer program is stored in the memory. When the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to execute a control method for implementing a scenic area pure electric safety braking early warning system.

[0087] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0088] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0089] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A control method for a pure electric safety braking early warning system in scenic areas, characterized in that, include: Acquire vehicle power SOC and vehicle status data; Evaluate the braking capacity of a vehicle under regenerative braking conditions; The system determines whether the vehicle's downhill switch is on. If it is on, the specific control methods for the pure electric safety braking warning system, based on the set thresholds for the vehicle's status during downhill driving, include: When the downhill switch is turned on, if the SOC is ≥98% and the brake pedal opening is ≥10%, the instrument panel will display "The battery does not support energy recovery, there is no electric braking, please drive with caution"; when When the battery level is less than 98%, and the product of the motor torque and the motor speed is greater than the current regenerative braking power, and the BMS issues a message that the battery is heating up, it will indicate that the power battery is heating up and ask the driver to drive carefully. The remaining heating time will be calculated and displayed. If the vehicle speed exceeds 20 km / h at this time, the instrument panel will issue an overspeed alarm to remind the driver to control the vehicle speed.

2. The control method for a scenic area pure electric safety braking early warning system as described in claim 1, characterized in that, The vehicle status data includes the total battery voltage, the real-time total current of the battery pack, the current charge status, and the brake pedal opening.

3. The control method for a pure electric safety braking early warning system in a scenic area as described in claim 1, characterized in that, The method for evaluating the braking capacity of a vehicle under regenerative braking conditions is to set up a progress bar on the vehicle's instrument display screen. The progress bar has three progressive color levels, displayed from light to dark.

4. The control method for a scenic area pure electric safety braking early warning system as described in claim 3, characterized in that, The shallowest progress bar displays the maximum recoverable power value, the intermediate progress bar displays the current recoverable power value, and the deepest progress bar displays the current actual recoverable power value.

5. The control method for a pure electric safety braking early warning system in a scenic area as described in claim 1, characterized in that, When the product of motor torque and motor speed is less than or equal to the current regenerative braking power, the BMS issues a message indicating that the battery is not heating and cancels the instrument display.

6. A pure electric safety braking early warning system for scenic areas, characterized in that, include: The power battery management system (BMS) is used to acquire vehicle power SOC and vehicle status data. The vehicle control unit (VCU) is used to evaluate the braking capability of a vehicle under regenerative braking conditions. The motor controller MCU is used to determine whether the vehicle downhill switch is turned on. If it is turned on, the braking speed of the vehicle is controlled according to the threshold value that the vehicle status meets during the downhill process. The system determines whether the vehicle's downhill switch is on. If it is on, the specific control methods for the pure electric safety braking warning system, based on the set thresholds for the vehicle's status during downhill driving, include: When the downhill switch is turned on, if the SOC is ≥98% and the brake pedal opening is ≥10%, the instrument panel will display "The battery does not support energy recovery, there is no electric braking, please drive with caution"; when When the battery level is less than 98%, and the product of the motor torque and the motor speed is greater than the current regenerative braking power, and the BMS issues a message that the battery is heating up, it will indicate that the power battery is heating up and ask the driver to drive carefully. The remaining heating time will be calculated and displayed. If the vehicle speed exceeds 20 km / h at this time, the instrument panel will issue an overspeed alarm to remind the driver to control the vehicle speed.

7. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium is used to store computer instructions, which, when executed by a processor, implement the control method of a scenic area pure electric safety braking early warning system as described in any one of claims 1-5.

8. An electronic device, characterized in that, include: The system comprises a processor, a memory, and a computer program; wherein the processor is connected to the memory, and the computer program is stored in the memory. When the electronic device is running, the processor executes the computer program stored in the memory to enable the electronic device to perform a control method for a scenic area pure electric safety braking early warning system as described in any one of claims 1-5.

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