A method and system for safe parking of electric vehicles on ramps

Abstract

This invention provides a method and system for safe parking of an electric vehicle on a slope, comprising: acquiring a parking function activation signal, causing the motor to enter a stall mode, in which a tiered stall protection mechanism is employed to prevent component overheating; simultaneously, the vehicle processor monitors the slope, motor speed, and maximum executable torque value of the motor in real time to control the electronic parking brake system to ensure the vehicle can maintain parking on the current slope. This invention employs a tiered stall protection mechanism to identify and control motor stall protection, better protecting key components. In slope parking scenarios, by identifying information such as torque and component temperature, the water pump and fan are controlled at different speeds for cooling. This tiered cooling control avoids energy waste in the vehicle and improves onboard energy utilization.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of ramp parking control, and particularly relates to a kind of electric vehicle ramp parking safety control method and system. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The increase of electric vehicle user group leads to the characteristics of diversification and complication of user scenarios, so the use safety of electric vehicles needs to be paid attention to. The electric vehicle ramp driving scenario is a high-frequency scenario used by users, and the ramp parking extended therefrom is a potential dangerous scenario, which needs to focus on the safety of users and vehicles during the parking process.

[0004] Currently, the electric vehicle mainly adopts the detection of the running speed of the vehicle and the behavior intention of the driver to realize the brake control of the vehicle during the ramp parking, but due to the different scenarios during the ramp parking, the demands are also different, and a single parking mode cannot meet the different parking demands. SUMMARY

[0005] In order to solve the above problems, the present application proposes an electric vehicle ramp parking safety control method, which is based on the ramp parking scenario, and comprehensively considers the user intention (stepping on the accelerator, opening the door, etc.) and the vehicle capability to realize the ramp parking safety control, so as to ensure the safety of users and vehicle parts.

[0006] According to some embodiments, the present application adopts the following technical scheme:

[0007] In a first aspect, an electric vehicle ramp parking safety control method is disclosed, comprising:

[0008] An activation signal of a parking function is acquired, and the motor enters a locked-rotor mode, in which a hierarchical locked-rotor protection mechanism is adopted to avoid over-temperature of the parts;

[0009] Meanwhile, the vehicle processor detects the slope, the motor speed and the maximum executable torque value of the motor in real time and controls the electronic parking brake system to ensure that the vehicle can maintain the current slope parking.

[0010] As a further technical scheme, the vehicle processor detects the slope, the motor speed and the maximum executable torque value of the motor in real time, wherein the vehicle processor checks and confirms whether the current capability of the motor can maintain the current slope according to the slope value, sends a request to the electronic parking brake system when the current capability of the motor cannot maintain the current slope, the electronic parking brake system is pulled up, otherwise the electronic parking brake system remains in the current state.

[0011] As a further technical solution, when the parking function is activated and the electronic parking brake system is engaged, the driving intention is detected. If the motor's torque is greater than a certain value, but the vehicle is still stationary, the motor frequency converter is adjusted, and the motor enters a stall state.

[0012] Next, the vehicle processor controls the operation of the water pump and fan. If the motor temperature or inverter temperature continues to rise and exceeds the protection threshold, the vehicle processor reports a stall fault, and the motor reduces its power output.

[0013] As a further technical solution, the vehicle processor detects the slope, motor speed, and maximum executable torque value of the motor in real time. When the vehicle is on a steep slope, the electronic parking brake system is engaged. If the torque requested by full throttle is insufficient to release the electronic parking brake system, the electronic parking brake system remains in its current state. At the same time, the driver can manually release the electronic parking brake system by pressing the brake pedal through voice prompts.

[0014] As a further technical solution, when the vehicle is on a steep slope, the parking function is activated. When the user presses the accelerator, the electronic parking brake system cannot be automatically released. At the same time, when the electronic parking brake system cannot be manually released, a rescue message is sent through the vehicle terminal, and the vehicle fault and location information are automatically sent to the cloud backend.

[0015] As a further technical solution, the motor adopts a graded stall protection mechanism when entering stall mode to prevent overheating of components, specifically:

[0016] When the motor enters stall mode, the low-speed water pump operates;

[0017] When the temperature of the motor or inverter exceeds the threshold A, the medium-speed water pump will operate.

[0018] The high-speed water pump operates when the temperature of the motor or inverter exceeds the threshold B.

[0019] When the temperature of the motor or inverter is higher than the threshold temperature C, the radiator cooling fan operates at low speed and the high-speed water pump operates.

[0020] When the temperature of the motor or inverter is higher than the threshold D, the fan will operate at medium speed and the water pump will operate at high speed.

[0021] When the temperature of the motor or inverter exceeds the threshold E, the fan operates at high speed and the high-speed water pump operates.

[0022] When the motor or inverter temperature exceeds the threshold value F, to prevent component overheating, the parking slope function is deactivated, the parking slope function activation indicator light on the instrument panel is turned off, and the electronic parking brake system is engaged to prevent the vehicle from rolling backwards. <B<C<D<E<F。

[0023] As a further technical solution, if the parking function is activated and the electric vehicle system is in a parking slope fault state, the parking slope function will be deactivated, the instrument panel will illuminate the corresponding component fault indicator light, and the electronic parking brake system will be engaged to prevent the vehicle from rolling downhill.

[0024] Secondly, a safety control system for electric vehicle ramp parking is disclosed, including: a core electronic control unit (VCU), an electronic parking brake system, and a vehicle processor.

[0025] The core electronic control unit (VCU) is used to collect vehicle throttle signals, slope signals, and gear information and transmit them to the vehicle processor in real time.

[0026] When the vehicle processor receives the parking function activation signal, the motor enters the stall mode. In this mode, a graded stall protection mechanism is used to prevent the components from overheating.

[0027] At the same time, the vehicle processor controls the electronic parking brake system to ensure that the vehicle can maintain its current slope while parked.

[0028] As a further technical solution, the vehicle processor also communicates with the instrument controller, the large screen controller and the vehicle terminal respectively;

[0029] The vehicle processor transmits the status of the electronic parking brake system, the fault status of components, the status of the hill-start assist function, and the over-temperature status of components to the instrument controller, which then performs its work and executes the feedback information.

[0030] The large screen controller receives the rescue request signal sent by the vehicle processor and also receives the rescue trigger signal;

[0031] The vehicle processor sends system fault information and rescue requests to the vehicle terminal, which then transmits the fault and location information to the cloud server.

[0032] Thirdly, an electric vehicle is disclosed, wherein the vehicle uses the aforementioned electric vehicle ramp parking safety control method or system for ramp parking.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0034] This invention implements multi-scenario parking safety redundancy logic control, which can meet parking control requirements in scenarios such as parking function not enabled, parking stop, parking stopped, parking stopped, rolling back, parking waiting to drive, and parking fault.

[0035] This invention employs a graded stall protection mechanism to identify and control motor stall protection, thereby better protecting key components. In hill-climbing scenarios, it controls the water pump and fan to operate at different speeds to cool the vehicle by identifying information such as torque and component temperature. This graded cooling control avoids energy waste in the vehicle and improves the vehicle's energy utilization rate.

[0036] This invention uses multimodal information recognition, such as slope, accelerator, and door, to control EPB execution and prevent rollback. It determines the slope maintenance capability based on the slope and motor capacity, and performs torque safety verification based on the slope, thus controlling the electronic parking brake system (EPB) more precisely. At the same time, it identifies EPB release risks based on the driver's requested torque and motor capacity, and informs the user via voice. If the EPB fails and cannot be released, it triggers a one-button rescue alarm to ensure vehicle safety.

[0037] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Figure 1 This is a schematic diagram of the stall protection control process for a sub-stage motor according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the sub-slope protection control process according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the system control flow for a sub-slope start-up scenario according to an embodiment of the present invention;

[0043] Figure 4 This is a block diagram of the communication logic of a subsystem according to an embodiment of the present invention. Detailed implementation method:

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0045] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. 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 invention pertains.

[0046] 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 scope of exemplary embodiments according to the invention. 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.

[0047] System multi-scenario state definition:

[0048] Hill-holding function not enabled: Users can turn the hill-holding function on or off via the large screen. When the user turns on the hill-holding function but it is not activated, the system is in the hill-holding function enabled state. If the system is activated, the system is in the hill-holding function activated state. Otherwise, when the function switch is in the off state, the system is in the hill-holding function disabled state.

[0049] Slope Stopping State: When the vehicle is on a slope and the vehicle power is off, the system is in the slope stopping state.

[0050] Hill Stop Status: When the hill stop function is activated, the vehicle is on a certain slope and the vehicle is not powered off. When the user opens the door, the system is in the hill stop status.

[0051] Hill-holding stop state: When the hill-holding function is activated, the vehicle is on a certain slope, the vehicle is not powered off, the vehicle is in the READY and ready-to-drive state, and the vehicle remains stationary, the system is in the hill-holding stop state.

[0052] Slope rolling state: When the parking function is activated, the vehicle is on a certain slope, the vehicle is not powered off, the whole vehicle is in READY and ready to drive, the accelerator is not pressed and the vehicle is not stationary, the system is in slope rolling state.

[0053] Hill-holding ready-to-drive status: When the hill-holding function is activated, the vehicle is on a certain slope, the vehicle is not powered off, the vehicle is in a READY ready-to-drive state, and the vehicle remains stationary. When the user presses the accelerator, the system enters the hill-holding ready-to-drive state.

[0054] Slope-standing fault condition: When components such as motors, inverters, and water pumps malfunction, the system is in a slope-standing fault condition.

[0055] Example 1:

[0056] In this embodiment, a method for safe parking of an electric vehicle on a ramp is disclosed, including:

[0057] Upon receiving the parking function activation signal, the motor enters stall mode. In this mode, a graded stall protection mechanism is employed to prevent components from overheating.

[0058] Meanwhile, the vehicle processor monitors the slope, motor speed, and maximum executable torque of the motor in real time to control the electronic parking brake (EPB) system to ensure that the vehicle can maintain parking on the current slope.

[0059] In this implementation example, the large screen is equipped with a parking slope function soft switch. When the parking slope function is turned on, the instrument panel lights up an indicator light to prompt the user that the function has been turned on.

[0060] When the function is activated, the instrument will illuminate the corresponding indicator light to indicate to the user that the slope holding function has been activated.

[0061] If the parking slope function is activated and the vehicle is on a slope, but the parking slope function is not activated, the EPB will be activated if the user turns off the power.

[0062] When the vehicle is on a slope and the system is in the hill-start assist stop state, the EPB is activated.

[0063] When the vehicle is on a slope and the hill-holding function is activated, the system is in a hill-holding stop state. If the user opens the door, the EPB will be pulled up and the EPB indicator light on the instrument panel will illuminate; otherwise, the EPB will remain in its current state.

[0064] When the vehicle is on a slope and the parking function is activated, if the system is in a rolling state, the EPB will be pulled up.

[0065] See appendix Figure 1 As shown in this embodiment, to prevent malfunctions caused by excessively high motor or inverter temperatures during stall mode when the vehicle is parked on a slope, resulting in component failure, a graded motor stall protection control is adopted, specifically:

[0066] When the hill-holding function is activated, the motor enters stall mode, the low-speed water pump operates, and when the motor or inverter temperature exceeds threshold A, the medium-speed water pump starts operating; when it exceeds threshold B, the high-speed water pump starts operating; when it exceeds threshold C, the radiator cooling fan starts operating at low speed, and the high-speed water pump operates; when it exceeds threshold D, the fan operates at medium speed, and the high-speed water pump operates; when it exceeds threshold E, the fan operates at high speed, and the high-speed water pump operates; when it exceeds threshold F, to prevent components from overheating, the hill-holding function deactivates, the hill-holding function activation indicator light on the instrument panel turns off, and the EPB is engaged to prevent the vehicle from rolling back on the slope.

[0067] In addition, when the slope holding function is activated, if the system is in a slope holding fault state, the slope holding function will be deactivated, the instrument will illuminate the corresponding component fault indicator light to facilitate user maintenance, and the EPB will be pulled up to prevent the slope from slipping.

[0068] It should also be noted that when the parking function is activated, the user should switch the gear to N gear to deactivate the parking function and engage EPB.

[0069] See appendix Figure 2As shown in this embodiment, to prevent the motor's current capacity from being insufficient to maintain the current slope, when the parking function is activated, the vehicle's MCU monitors the slope, motor speed, and maximum executable torque value of the motor in real time. Based on the slope value, the MCU checks and confirms whether the motor's current capacity can maintain the current slope. If it cannot maintain the current slope, for example, if the motor's current maximum capacity is 100 N·m and maintaining the current slope requires 120 N·m, the MCU requests the EPB to pull up; otherwise, the EPB remains in its current state. If the vehicle is on a large slope, the MCU requests the EPB to pull up, but the EPB reports a fault and cannot perform the pulling up action, and the user is prompted with a voice prompt: "Please apply the brakes, the vehicle may roll back."

[0070] Specifically, the slope values ​​that can be maintained by different motor torques are shown in Table 1.

[0071] Table 1

[0072]

[0073] The aforementioned gradient and motor capacity need to be verified based on the actual vehicle model. Overall, motor capacity and gradient are directly proportional.

[0074] When the hill-start assist function is activated and the EPB is in the pulled-up state, the user presses the accelerator to prepare to drive. If the motor's torque exceeds a certain value, but the vehicle is still stationary, the motor frequency converter adjusts, and the motor enters a stall state. The MCU controls the water pump and fan to run at high speed. If the motor temperature or inverter temperature continues to rise and exceeds a certain protection threshold T, the MCU reports a stall fault to the instrument panel, and the motor reduces its power output.

[0075] It should be noted that when the motor is in stall mode, if the motor's torque is less than a certain value or the vehicle speed is not 0 km / h, the motor will exit stall mode and the stall fault light on the instrument panel will turn off.

[0076] In this implementation example, please refer to the appendix for the system control flow of the hill start-up scenario. Figure 3 As shown, when the vehicle is on a steep slope, the EPB is in the pulled-up state. If, due to battery or other system reasons, the torque requested by the driver at full throttle is insufficient to release the EPB, the EPB will remain in its current state. At the same time, the system will prompt with a voice message: "Please press the brake to manually release the EPB."

[0077] In addition, when the vehicle is on a steep slope, the hill-hold function is activated. When the user presses the accelerator, the EPB cannot be automatically released. At the same time, when the EPB cannot be manually released, the system triggers the one-click rescue function. A pop-up window on the large screen prompts the user: "Do you need rescue?" After the user selects rescue, the TBOX (vehicle terminal) automatically sends the vehicle fault and location information to the cloud backend.

[0078] Example 2:

[0079] See appendixFigure 4 As shown, based on the method of Embodiment 1, an electric vehicle ramp parking safety control system is disclosed, including: a core electronic control unit (VCU), an electronic parking brake system, and a motor processor (MCU).

[0080] The core electronic control unit (VCU) is used to collect vehicle throttle signals, slope signals, and gear information and transmit them to the vehicle processor (MCU) in real time.

[0081] When the vehicle processor receives the parking function activation signal, the motor enters the stall mode. In this mode, a graded stall protection mechanism is used to prevent the components from overheating.

[0082] At the same time, the vehicle processor controls the electronic parking brake system to ensure that the vehicle can maintain its current slope while parked.

[0083] In this embodiment, the vehicle processor also communicates with the instrument controller, the large screen controller, and the vehicle terminal, respectively.

[0084] The vehicle processor transmits the status of the electronic parking brake system, component fault status, hill-start assist status, and component over-temperature status to the instrument controller, which then performs its functions and executes the feedback information.

[0085] When the slope is steep and the EPB malfunctions and cannot release the parking function, the vehicle will not move when the accelerator is pressed. The EPB will then send the fault information to the MCU, and the MCU will send the fault information that the vehicle cannot move to the large screen controller.

[0086] The large screen controller receives the rescue request signal sent by the vehicle processor and also receives the rescue trigger signal;

[0087] The vehicle processor sends system fault information and rescue requests to the vehicle terminal, which then transmits the fault and location information to the cloud server.

[0088] Example 3:

[0089] This embodiment discloses an electric vehicle, which uses the electric vehicle ramp parking safety control method in Embodiment 1 or the system in Embodiment 2 for ramp parking.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0091] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. 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 the present invention are still within the scope of protection of the present invention.

Claims

1. A method for controlling the safety of an electric vehicle on a slope, characterized in that, The application comprises: An engine enters a stall mode, in which a hierarchical stall protection mechanism is adopted to avoid over-temperature of components; The engine enters the stall mode and adopts the hierarchical stall protection mechanism to avoid over-temperature of components, specifically: When the engine enters the stall mode, a low-speed water pump works; When the engine or inverter temperature is higher than threshold A, a medium-speed water pump works; When the engine or inverter temperature is higher than threshold B, a high-speed water pump works; When the engine or inverter temperature is higher than threshold C, a radiator cooling fan works at low speed and the high-speed water pump works; When the engine or inverter temperature is higher than threshold D, the fan works at medium speed and the high-speed water pump works; When the engine or inverter temperature is higher than threshold E, the fan works at high speed and the high-speed water pump works; When the engine or inverter temperature is higher than threshold F, over-temperature of components is avoided, the hill-hold function is exited, an instrument extinguishes a hill-hold function activation indicator light, and an electronic parking brake system is pulled up to prevent the vehicle from rolling down a slope, wherein A < B < C < D < E < F; Meanwhile, a vehicle processor detects a slope, an engine speed and a maximum executable torque value of the engine in real time and controls the electronic parking brake system to ensure that the vehicle can maintain current slope parking; The vehicle processor detects the slope, the engine speed and the maximum executable torque value of the engine in real time, wherein when the vehicle is on a large slope, the electronic parking brake system is in a pulled-up state, if full throttle request torque is insufficient to release the electronic parking brake system, the electronic parking brake system remains in the current state, and at the same time, a voice prompt is given to step on the brake and manually release the electronic parking brake system; When the vehicle is on a large slope, the hill-hold function is activated, the user steps on the accelerator, the electronic parking brake system cannot be automatically released, and when the electronic parking brake system cannot be manually released, rescue information is sent through a vehicle terminal, and vehicle failure and location information are automatically sent to a cloud background.

2. The electric vehicle hill hold control method of claim 1, wherein the hill hold control method further comprises: The vehicle processor detects the slope, the engine speed and the maximum executable torque value of the engine in real time, wherein the vehicle processor checks and confirms whether the current ability of the engine can maintain the current slope according to the slope value, when the current ability of the engine cannot maintain the current slope, a request is sent to the electronic parking brake system, the electronic parking brake system is pulled up, otherwise the electronic parking brake system remains in the current state.

3. The electric vehicle ramp parking safety control method as described in claim 2, characterized in that, When the hill-hold function is activated and the electronic parking brake system is in the pulled-up state, a driving intention is detected, if the engine execution torque is greater than a certain value, but the vehicle is still in a stationary state, the engine frequency conversion is adjusted, and the engine enters a stall state; Then the vehicle processor controls the water pump and the fan to operate, if the engine temperature or the inverter temperature continues to rise and exceeds a protection threshold, the vehicle processor reports a stall fault, and the engine reduces power output.

4. The method of claim 1-3, wherein the method further comprises: When the hill-hold function is activated, if the electric vehicle system is in a hill-hold fault state, the hill-hold function is exited, corresponding component fault indicator lights of the instrument are lit, and the electronic parking brake system is pulled up to prevent rolling down the slope.

5. An electric vehicle hill hold safety control system, characterized by, The application comprises: a core electronic control unit VCU, an electronic parking brake system and a vehicle processor; The core electronic control unit VCU is used to collect vehicle throttle signals, slope signals where the vehicle is located and gear information of the vehicle and transmit the signals to the vehicle processor in real time. The vehicle processor acquires a parking function activation signal, and the motor enters a stall mode, in which a hierarchical stall protection mechanism is adopted to avoid over-temperature of components; The motor enters the stall mode and adopts the hierarchical stall protection mechanism to avoid over-temperature of components, specifically: When the motor enters the stall mode, the low-speed water pump works; When the motor or the inverter temperature is higher than threshold A, the medium-speed water pump works; When the motor or the inverter temperature is higher than threshold B, the high-speed water pump works; When the motor or the inverter temperature is higher than threshold C, the radiator cooling fan works at low speed, and the high-speed water pump works; When the motor or the inverter temperature is higher than threshold D, the fan works at medium speed, and the high-speed water pump works; When the motor or the inverter temperature is higher than threshold E, the fan works at high speed, and the high-speed water pump works; When the motor or the inverter temperature is higher than threshold F, over-temperature of components is avoided, the hill hold function is exited, the hill hold function activation indicator light on the instrument is extinguished, and the electronic parking brake system is pulled up to prevent the vehicle from rolling down the slope, wherein A < B < C < D < E < F; Meanwhile, the vehicle processor controls the electronic parking brake system to ensure that the vehicle can be parked on the current slope; The vehicle processor detects the slope, the motor speed and the maximum executable torque value of the motor in real time, wherein when the vehicle is on a large slope, the electronic parking brake system is in the pulled-up state, if the full throttle request torque is insufficient to release the electronic parking brake system, the electronic parking brake system remains in the current state, and at the same time, a voice prompt is given to step on the brake and manually release the electronic parking brake system; When the vehicle is on a large slope, the hill hold function is activated, the user steps on the accelerator, the electronic parking brake system cannot be automatically released, and at the same time, the electronic parking brake system cannot be manually released, the vehicle terminal sends a rescue information, and automatically sends the vehicle fault and position information to the cloud background.

6. The electric vehicle hill hold safety control system of claim 5, wherein the controller is further programmed to: The vehicle processor also communicates with the instrument controller, the large screen controller and the vehicle terminal respectively; The vehicle processor transmits the electronic parking brake system state, the component fault state, the hill hold function state and the component over-temperature state to the instrument controller, and the instrument controller works and executes feedback information; The large screen controller receives the rescue request signal sent by the vehicle processor and receives a rescue trigger signal; The vehicle processor sends system fault information and a rescue request to the vehicle terminal, and the vehicle terminal transmits the fault and position information to the cloud server.

7. An electric vehicle characterized by comprising: The vehicle uses the electric vehicle hill parking safety control method of any one of claims 1-4 or the system of any one of claims 5-6 to park on a hill.

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